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  <front>
    <title abbrev="IoT Edge Computing">IoT Computing">Internet of Things (IoT) Edge Challenges and Functions</title>
    <seriesInfo name="Internet-Draft" value="draft-irtf-t2trg-iot-edge-10"/> name="RFC" value="9556"/>
    <author initials="J." surname="Hong" fullname="Jungha Hong">
      <organization>ETRI</organization>
      <address>
        <postal>
          <street>218 Gajeong-ro, Yuseung-Gu</street>
          <city>Daejeon</city>
          <code>34129</code>
          <country>Republic of Korea</country>
        </postal>
        <email>jhong@etri.re.kr</email>
      </address>
    </author>
    <author initials="Y.-G." initials="Y-G." surname="Hong" fullname="Yong-Geun Hong">
      <organization>Daejeon University</organization>
      <address>
        <postal>
          <street>62 Daehak-ro, Dong-gu</street>
          <city>Daejeon</city>
          <code>300716</code>
          <country>Republic of Korea</country>
        </postal>
        <email>yonggeun.hong@gmail.com</email>
      </address>
    </author>
    <author initials="X." surname="de Foy" fullname="Xavier de Foy">
      <organization>InterDigital Communications, LLC</organization>
      <address>
        <postal>
          <street>1000 Sherbrooke West</street>
          <city>Montreal</city>
          <code>H3A 3G4</code>
          <country>Canada</country>
        </postal>
        <email>xavier.defoy@interdigital.com</email>
      </address>
    </author>
    <author initials="M." surname="Kovatsch" fullname="Matthias Kovatsch">
      <organization>Huawei Technologies Duesseldorf GmbH</organization>
      <address>
        <postal>
          <street>Riesstr. 25 C // 3.OG</street>
          <city>Munich</city>
          <code>80992</code>
          <country>Germany</country>
        </postal>
        <email>ietf@kovatsch.net</email>
      </address>
    </author>
    <author initials="E." surname="Schooler" fullname="Eve Schooler">
      <organization>Intel</organization>
      <organization>University of Oxford</organization>
      <address>
        <postal>
          <street>2200 Mission College Blvd.</street>
          <city>Santa Clara, CA</city>
          <code>95054-1537</code>
          <country>USA</country>
          <street>Parks Road</street>
          <city>Oxford</city>
          <code>OX1 3PJ</code>
          <country>United Kingdom</country>
        </postal>
        <email>eve.schooler@gmail.com</email>
      </address>
    </author>
    <author initials="D." surname="Kutscher" fullname="Dirk Kutscher">
      <organization>Hong
      <organization abbrev="HKUST(GZ)">Hong Kong University of Science and Technology (Guangzhou)</organization>
      <address>
        <postal>
          <street>No.1 Du Xue Rd</street>
          <city>Guangzhou</city>
          <country>China</country>
        </postal>
        <email>ietf@dkutscher.net</email>
      </address>
    </author>
    <date year="2023" month="September" day="15"/>
    <area>T2TRG</area> year="2024" month="March"/>
    <workgroup>Thing-to-Thing</workgroup>
    <keyword>in-network computing</keyword>
    <keyword>in-network caching</keyword>
    <keyword>in-network storage</keyword>

    <abstract>
      <?line 879?>

<t>Many Internet of Things (IoT) applications have requirements that cannot be satisfied by traditional centralized cloud-based systems (i.e., cloud computing). These include time sensitivity, data volume, connectivity cost, operation in the face of intermittent services, privacy, and security. As a result, IoT is driving the Internet toward edge computing. This document outlines the requirements of the emerging IoT Edge edge and its challenges. It presents a general model and major components of the IoT Edge edge to provide a common basis for future discussions in the T2TRG Thing-to-Thing Research Group (T2TRG) and other IRTF and IETF groups. This document is a product of the IRTF Thing-to-Thing Research Group (T2TRG).</t> T2TRG.</t>
    </abstract>
  </front>
  <middle>
    <?line 883?>
 <section anchor="introduction">
      <name>Introduction</name>
      <t>Currently,
      <t>At the time of writing, many IoT services leverage cloud computing platforms, platforms because they provide virtually unlimited storage and processing power. The reliance of IoT on back-end cloud computing provides additional advantages advantages, such as scalability and efficiency.  Today's  At the time of writing, IoT systems are fairly static with respect to integrating and supporting computation.  It is not that there is no computation, but that systems are often limited to static configurations (edge gateways and cloud services).</t>
      <t>However, IoT devices generate large amounts of data at the edges of the network. To meet IoT use case requirements, data is increasingly being stored, processed, analyzed, and acted upon close to the data sources. These requirements include time sensitivity, data volume, connectivity cost, and resiliency in the presence of intermittent connectivity, privacy, and security, which cannot be addressed by centralized cloud computing. A more flexible approach is necessary to address these needs effectively. This involves distributing computing (and storage) and seamlessly integrating it into the edge-cloud continuum. We refer to this integration of edge computing and IoT as "IoT edge computing". This draft document describes the related background, use cases, challenges, system models, and functional components.</t>
      <t>Owing to the dynamic nature of the IoT edge computing landscape, this document does not list existing projects in this field. <xref target="sec-overview"/> presents a high-level overview of the field, field based on a limited review of standards, research, and open-source and proprietary products in <xref target="I-D.defoy-t2trg-iot-edge-computing-background"/>.</t>
      <t>This document represents the consensus of the Thing-to-Thing Research Group (T2TRG). It has been reviewed extensively by the Research Group (RG) research group members who are actively involved in the research and development of the technology covered by this document. It is not an IETF product and is not a standard.</t>
    </section>
    <section anchor="background">
      <name>Background</name>
      <section anchor="internet-of-things-iot">
        <name>Internet of Things (IoT)</name>
        <t>Since the term "Internet of Things" (IoT) was coined by Kevin Ashton in 1999 while working on Radio-Frequency Identification (RFID) technology <xref target="Ashton"/>, the concept of IoT has evolved. It now At the time of writing, it reflects a vision of connecting the physical world to the virtual world of computers using (often wireless) networks over which things can send and receive information without human intervention.  Recently, the term has become more literal by connecting things to the Internet and converging on Internet and Web web technologies.</t>
        <t>A Thing "Thing" is a physical item made available in the IoT, thereby enabling digital interaction with the physical world for humans, services, and/or other Things (<xref target="I-D.irtf-t2trg-rest-iot"/>). <xref target="I-D.irtf-t2trg-rest-iot"/>. In this document document, we will use the term "IoT device" to designate the embedded system attached to the Thing.</t>
        <t>Resource-constrained Things Things, such as sensors, home appliances appliances, and wearable devices devices, often have limited storage and processing power, which can provide create challenges with respect to reliability, performance, energy consumption, security, and privacy <xref target="Lin"/>. Some, less resource-constrained less-resource-constrained Things, can generate a voluminous amount of data. This range of factors led to IoT designs that integrate Things into larger distributed systems, for example example, edge or cloud computing systems.</t>
      </section>
      <section anchor="cloud-computing">
        <name>Cloud Computing</name>
        <t>Cloud computing has been defined in <xref target="NIST"/>: "cloud target="NIST"/>:</t>
	<blockquote>cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction".  The interaction.</blockquote>
	<t>The low cost and massive availability of storage and processing power enabled the realization of another computing model, model in which virtualized resources can be leased in an on-demand fashion and be provided as general utilities. Platform-as-a-Service (PaaS) and cloud computing platforms widely adopted this paradigm for delivering services over the Internet, gaining both economical and technical benefits <xref target="Botta"/>.</t>
        <t>Today,
        <t>At the time of writing, an unprecedented volume and variety of data is generated by Things, and applications deployed at the network edge consume this data.  In this context, cloud-based service models are not suitable for some classes of applications which that require very short response times, require access to local personal data, or generate vast amounts of data.  These applications may instead leverage edge computing.</t>
      </section>
      <section anchor="edge-computing">
        <name>Edge Computing</name>
        <t>Edge computing, also referred to as fog computing "fog computing" in some settings, is a new paradigm in which substantial computing and storage resources are placed at the edge of the Internet, close to mobile devices, sensors, actuators, or machines.  Edge computing happens near data sources <xref target="Mahadev"/>, target="Mahadev"/> as well as close to where decisions are made or where interactions with the physical world take place ("close" here can refer to a distance which that is topological, physical, latency-based, etc.).  It processes both downstream data (originating from cloud services) and upstream data (originating from end devices or network elements).  The term "fog computing" usually represents the notion of multi-tiered edge computing, that is, several layers of compute infrastructure between end devices and cloud services.</t>
        <t>An edge device is any computing or networking resource residing between end-device data sources and cloud-based data centers.  In edge computing, end devices consume and produce data. At the network edge, devices not only request services and information from the Cloud cloud but also handle computing tasks including processing, storage, storing, caching, and load balancing on data sent to and from the Cloud cloud <xref target="Shi"/>.  This does not preclude end devices from hosting computation themselves, when possible, independently or as part of a distributed edge computing platform.</t>
        <t>Several standards developing organization (SDO) Standards Developing Organizations (SDOs) and industry forums have provided definitions of edge and fog computing:</t>
        <ul spacing="normal">
          <li>ISO defines edge computing as a "form of distributed computing in which significant processing and data storage takes place on nodes which are at the edge of the network" <xref target="ISO_TR"/>.</li>
          <li>ETSI defines multi-access edge computing as a "system which provides an IT service environment and cloud-computing capabilities at the edge of an access network which contains one or more type of access technology, and in close proximity to its users" <xref target="ETSI_MEC_01"/>.</li>
          <li>The Industry IoT Consortium (IIC, now (IIC) (now incorporating what was formerly OpenFog) defines fog computing as "a horizontal, system-level architecture that distributes computing, storage, control and networking functions closer to the users along a cloud-to-thing continuum" <xref target="OpenFog"/>.</li>
        </ul>
        <t>Based on these definitions, we can summarize a general philosophy of edge computing as distributing the required functions close to users and data, while the difference to classic local systems is the usage of management and orchestration features adopted from cloud computing.</t>
        <t>Actors from various industries approach edge computing using different terms and reference models models, although, in practice, these approaches are not incompatible and may integrate with each other:</t>
        <ul spacing="normal">
          <li>The telecommunication industry tends to use a model where edge computing services are deployed over a Network Function Virtualization (NFV) infrastructure, at aggregation points points, or in proximity to the user equipment (e.g., gNodeBs) <xref target="ETSI_MEC_03"/>.</li>
          <li>Enterprise and campus solutions often interpret edge computing as an "edge cloud", that is, a smaller data center directly connected to the local network (often referred to as "on-premise").</li>
          <li>The automation industry defines the edge as the connection point between IT and OT (Operational Technology). Operational Technology (OT). Hence, edge computing sometimes refers to applying IT solutions to OT problems, such as analytics, more flexible more-flexible user interfaces, or simply having more computing power than an automation controller.</li>
        </ul>
      </section>
      <section anchor="sec-uc">
        <name>Examples of IoT Edge Computing Use Cases</name>
        <t>IoT edge computing can be used in home, industry, grid, healthcare, city, transportation, agriculture, and/or educational scenarios. Here, we discuss only a few examples of such use cases, cases to identify differentiating requirements, providing references to other use cases.</t>
        <t><strong>Smart Factory</strong></t>
        <t>As
	<dl newline="true" spacing="normal">
        <dt><strong>Smart Factory</strong></dt>
        <dd><t>As part of the 4th industrial revolution, Fourth Industrial Revolution, smart factories run real-time processes based on IT technologies, such as artificial intelligence and big data. Even a very small environmental change in a smart factory can lead to a situation in which production efficiency decreases or product quality problems occur. Therefore, simple but time-sensitive processing can be performed at the edge, for example, controlling the temperature and humidity in the factory, factory or operating machines based on the real-time collection of the operational status of each machine. However, data requiring highly precise analysis, such as machine lifecycle life-cycle management or accident risk prediction, can be transferred to a central data center for processing.</t>
        <t>The use of edge computing in a smart factory can reduce the cost of network and storage resources by reducing the communication load to the central data center or server. It is also possible to improve process efficiency and facility asset productivity through real-time prediction of failures and to reduce the cost of failure through preliminary measures. In the existing manufacturing field, production facilities are manually run according to a program entered in advance; however, edge computing in a smart factory enables tailoring solutions by analyzing data at each production facility and machine level. Digital twins <xref target="Jones"/> of IoT devices have been jointly used with edge computing in industrial IoT scenarios <xref target="Chen"/>.</t>
        <t><strong>Smart Grid</strong></t>
        <t>In target="Chen"/>.</t></dd>
        <dt><strong>Smart Grid</strong></dt>
        <dd><t>In future smart city smart-city scenarios, the Smart Grid smart grid will be critical in ensuring highly available/efficient energy control in city-wide electricity management.  Edge computing is expected to play a significant role in these systems to improve the transmission efficiency of electricity, to react to, to and restore power after a disturbance, to reduce operation costs, and to reuse energy effectively, effectively since these operations involve local decision-making. In addition, edge computing can help monitor power generation and power demand, demand and make local electrical energy storage decisions in smart grid systems.</t>
        <t><strong>Smart Agriculture</strong></t>
        <t>Smart systems.</t></dd>
        <dt><strong>Smart Agriculture</strong></dt>
        <dd><t>Smart agriculture integrates information and communication technologies with farming technology. Intelligent farms use IoT technology to measure and analyze parameters, such as the temperature, humidity, sunlight, carbon dioxide, and soil quality, in crop cultivation facilities. Depending on the analysis results, control devices are used to set the environmental parameters to an appropriate state. Remote management is also possible through mobile devices devices, such as smartphones.</t>
        <t>In existing farms, simple systems systems, such as management according to temperature and humidity humidity, can be easily and inexpensively implemented using IoT technology. Field sensors gather data on field and crop condition. This data is then transmitted to cloud servers that process data and recommend actions. The use of edge computing can reduce the volume of back-and-forth data transmissions significantly, resulting in cost and bandwidth savings. Locally generated data can be processed at the edge, and local computing and analytics can drive local actions. With edge computing, it is easy for farmers to select large amounts of data for processing, and data can be analyzed even in remote areas with poor access conditions. Other applications include enabling dashboarding, for example, to visualize the farm status, as well as enhancing Extended Reality (XR) applications that require edge audio/video processing. As the number of people working on farming has been decreasing over time, increasing automation enabled by edge computing can be a driving force for future smart agriculture.</t>
        <t><strong>Smart Construction</strong></t>
        <t>Safety agriculture.</t></dd>
        <dt><strong>Smart Construction</strong></dt>
        <dd><t>Safety is critical at construction sites. Every year, many construction workers lose their lives because of falls, collisions, electric shocks, and other accidents.  Therefore, solutions have been developed to improve construction site safety, including the real-time identification of workers, monitoring of equipment location, and predictive accident prevention. To deploy these solutions, many cameras and IoT sensors have been installed on construction sites, sites to measure noise, vibration, gas concentration, etc. Typically, the data generated from these measurements is collected in on-site gateways and sent to remote cloud servers for storage and analysis. Thus, an inspector can check the information stored on the cloud server to investigate an incident. However, this approach can be expensive because of transmission costs, for costs (for example, of video streams over a mobile network connection, connection) and because usage fees of private cloud services.</t>
        <t>Using edge computing, data generated at the construction site can be processed and analyzed on an edge server located within or near the site. Only the result of this processing needs to be transferred to a cloud server, thus reducing transmission costs. It is also possible to locally generate warnings to prevent accidents in real-time.</t>
        <t><strong>Self-Driving Car</strong></t>
        <t>Edge real time.</t></dd>
        <dt><strong>Self-Driving Car</strong></dt>
        <dd><t>Edge computing plays a crucial role in safety-focused self-driving car systems. With a multitude of sensors, such as high-resolution cameras, radar, LIDAR, radars, Light Detection and Ranging (LiDAR), sonar sensors, and GPS systems, autonomous vehicles generate vast amounts of real-time data. Local processing utilizing edge computing nodes allows for efficient collection and analysis of this data to monitor vehicle distances and road conditions and respond promptly to unexpected situations. Roadside computing nodes can also be leveraged to offload tasks when necessary, for example, when the local processing capacity of the car is insufficient because of hardware constraints or a large data volume.</t>
        <t>For instance, when the car ahead slows, a self-driving car adjusts its speed to maintain a safe distance, or when a roadside signal changes, it adapts its behavior accordingly. In another example, cars equipped with self-parking features utilize local processing to analyze sensor data, determine suitable parking spots, and execute precise parking maneuvers without relying on external processing or connectivity. It is also possible to use in-cabin cameras coupled with local processing to monitor the driver's attention level and detect signs of drowsiness or distraction. The system can issue warnings or implement preventive measures to ensure driver safety.</t>
        <t>Edge computing empowers self-driving cars by enabling real-time processing, reducing latency, enhancing data privacy, and optimizing bandwidth usage. By leveraging local processing capabilities, self-driving cars can make rapid decisions, adapt to changing environments, and ensure safer and more efficient autonomous driving experiences.</t>
        <t><strong>Digital Twin</strong></t>
        <t>A experiences.</t></dd>
        <dt><strong>Digital Twin</strong></dt>
        <dd><t>A digital twin can simulate different scenarios and predict outcomes based on real-time data collected from the physical environment. This simulation capability empowers proactive maintenance, optimization of operations, and the prediction of potential issues or failures. Decision makers can use digital twins to test and validate different strategies, identify inefficiencies, and optimize performance.</t>
        <t>With edge computing, real-time data is collected, processed, and analyzed directly at the edge, allowing for the accurate monitoring and simulation of physical assets. Moreover, edge computing effectively minimizes latency, enabling rapid responses to dynamic conditions as computational resources are brought closer to the physical object. Running digital twin processing at the edge enables organizations to obtain timely insights and make informed decisions that maximize efficiency and performance.</t>
        <t><strong>Other performance.</t></dd>
        <dt><strong>Other Use Cases</strong></t>
        <t>AI/ML Cases</strong></dt>
        <dd><t>Artificial intelligence (AI) / machine learning (ML) systems at the edge empower real-time analysis, faster decision-making, reduced latency, improved operational efficiency, and personalized experiences across various industries, industries by bringing artificial intelligence AI and machine learning ML capabilities closer to edge devices.</t>
        <t>In addition, oneM2M has studied several IoT edge computing use cases, which are documented in <xref target="oneM2M-TR0001"/>, <xref target="oneM2M-TR0018"/> target="oneM2M-TR0018"/>, and <xref target="oneM2M-TR0026"/>. The edge computing related edge-computing-related requirements raised through the analysis of these use cases are captured in <xref target="oneM2M-TS0002"/>.</t> target="oneM2M-TS0002"/>.</t></dd>
      </dl>
      </section>
    </section>
    <section anchor="sec-challenges">
      <name>IoT Challenges Leading Towards toward Edge Computing</name>

      <t>This section describes the challenges faced by the IoT that are motivating the adoption of edge computing. These are distinct from the research challenges applicable to IoT edge computing, some of which are mentioned in <xref target="sec-functions"/>.</t>
      <t>IoT technology is used with increasingly demanding applications, for example, applications in
   domains such as industrial, automotive automotive, and healthcare domains, leading healthcare, which leads
   to new challenges.  For example, industrial machines machines, such as laser cutters cutters, produce over 1 terabyte of data per hour, and similar amounts can be generated in autonomous cars <xref target="NVIDIA"/>.  90% of IoT data is expected to be stored, processed, analyzed, and acted upon close to the source <xref target="Kelly"/>, as cloud computing models alone cannot address these new challenges <xref target="Chiang"/>.</t>
      <t>Below, we discuss IoT use case requirements that are moving cloud capabilities to be more proximate, distributed, and disaggregated.</t>
      <section anchor="time-sensitivity">
        <name>Time Sensitivity</name>
        <t>Many
        <t>Often, many industrial control systems, such as manufacturing systems, smart grids, and oil and gas systems often systems, require stringent end-to-end latency between the sensor and control nodes.  While some IoT applications may require latency below a few tens of milliseconds <xref target="Weiner"/>, industrial robots and motion control systems have use cases for cycle times in the order of microseconds <xref target="_60802"/>. target="IEC_IEEE_60802"/>.  In some cases, speed-of-light limitations may simply prevent a cloud-based solutions; however, this is not the only challenge relative to time sensitivity.  Guarantees for bounded latency and jitter (<xref target="RFC8578"/> section 7) target="RFC8578" sectionFormat="comma" section="7"/>) are also important for industrial IoT applications.  This means that control packets must arrive with as little variation as possible and within a strict deadline.  Given the best-effort characteristics of the Internet, this challenge is virtually impossible to address, address without using end-to-end guarantees for individual message delivery and continuous data flows.</t>
      </section>
      <section anchor="connectivity-cost">
        <name>Connectivity Cost</name>
        <t>Some IoT deployments may not face bandwidth constraints when uploading data to the Cloud. cloud.  Theoretically, both 5G and Wi-Fi 6 networks both theoretically top out at 10 gigabits per second (i.e., 4.5 terabytes per hour), allowing to the transfer of large amounts of uplink data.  However, the cost of maintaining continuous high-bandwidth connectivity for such usage is unjustifiable and impractical for most IoT applications.  In some settings, for example, in aeronautical communication, higher communication costs reduce the amount of data that can be practically uploaded even further.  Minimizing  Therefore, minimizing reliance on high-bandwidth connectivity is therefore a requirement, requirement; this can be done, for example, by processing data at the edge and deriving summarized or actionable insights that can be transmitted to the Cloud.</t> cloud.</t>
      </section>
      <section anchor="resilience-to-intermittent-services">
        <name>Resilience to Intermittent Services</name>
        <t>Many IoT devices, such as sensors, actuators, and controllers, have very limited hardware resources and cannot rely solely on their own resources to meet their computing and/or storage needs.  They require reliable, uninterrupted, or resilient services to augment their capabilities to fulfill their application tasks.  This is difficult and partly impossible to achieve using cloud services for systems such as vehicles, drones, or oil rigs that have intermittent network connectivity. Conversely, a cloud back-end backend might want to device data
   even if it is currently asleep.</t>
      </section>
      <section anchor="sec-priv">
        <name>Privacy and Security</name>
        <t>When IoT services are deployed at home, personal information can be learned from detected usage data.  For example, one can extract information about employment, family status, age, and income by analyzing smart-meter smart meter data <xref target="ENERGY"/>.  Policy makers have begun to provide frameworks that limit the usage of personal data and impose strict requirements on data controllers and processors.  Data stored indefinitely in the Cloud cloud also increases the risk of data leakage, for instance, through attacks on rich targets.</t>
        <t>It is often argues argued that industrial systems do not provide privacy implications, as no personal data is gathered.  However, data from such systems is often highly sensitive, as one might be able to infer trade secrets secrets, such as the setup of production lines.  Hence, owners of these systems are generally reluctant to upload IoT data to the Cloud.</t> cloud.</t>
        <t>Furthermore, passive observers can perform traffic analysis on device-to-cloud paths.  Therefore, hiding traffic patterns associated with sensor networks can be another requirement for edge computing.</t>
      </section>
    </section>
    <section anchor="sec-functions">
      <name>IoT Edge Computing Functions</name>
      <t>We first look at the current state of IoT edge computing (<xref target="sec-overview"/>), target="sec-overview"/>) and then define a general system model (<xref target="sec-model"/>). This provides a context for IoT edge-computing edge computing functions, which are listed in Sections <xref target="sec-components-oam"/>, target="sec-components-oam" format="counter"/>, <xref target="sec-components-functional"/> target="sec-components-functional" format="counter"/>, and <xref target="sec-components-app"/>.</t> target="sec-components-app" format="counter"/>.</t>
      <section anchor="sec-overview">
        <name>Overview of IoT Edge Computing Today</name> Computing</name>
        <t>This section provides an overview of today's the current (at the time of writing) IoT edge computing field based on a limited review of standards, research, and open-source and proprietary products in <xref target="I-D.defoy-t2trg-iot-edge-computing-background"/>.</t>
        <t>IoT gateways, both open-source (such as EdgeX Foundry or Home Edge) and proprietary products, represent a common class of IoT edge-computing edge computing products, where the gateway provides a local service on customer premises and is remotely managed through a cloud service. IoT communication protocols are typically used between IoT devices and the gateway, including CoAP a Constrained Application Protocol (CoAP) <xref target="RFC7252"/>, MQTT Message Queuing Telemetry Transport (MQTT) <xref target="mqtt5"/>, target="MQTT5"/>, and many specialized IoT protocols (such as OPC UA  Open Platform Communications Unified Architecture (OPC UA) and DDS Data Distribution Service (DDS) in the Industrial industrial IoT space), while the gateway communicates with the distant cloud typically using HTTPS. Virtualization platforms enable the deployment of virtual edge computing functions (using VMs Virtual Machines (VMs) and application containers), including IoT gateway software, on servers in the mobile network infrastructure (at base stations and concentration points), edge data centers (in central offices), and regional data centers located near central offices. End devices are envisioned to become computing devices in forward-looking projects, projects but are not commonly used today.</t> at the time of writing.</t>
        <t>In addition to open-source and proprietary solutions, a horizontal IoT service layer is standardized by the oneM2M standards body to reduce fragmentation, increase interoperability interoperability, and promote reuse in the IoT ecosystem. Furthermore, ETSI MEC Multi-access Edge Computing (MEC) developed an IoT API <xref target="ETSI_MEC_33"/> that enables the deployment of heterogeneous IoT platforms and provides a means to configure the various components of an IoT system.</t>
        <t>Physical or virtual IoT gateways can host application programs that are typically built using an SDK to access local services through a programmatic API.  Edge cloud system operators host their customers' application VMs or containers on servers located in or near access networks that can implement local edge services. For example, mobile networks can provide edge services for radio-network radio network information, location, and bandwidth management.</t>
        <t>Resilience in the IoT can entail the ability to operate autonomously in periods of disconnectedness to preserve the integrity and safety of the controlled system, possibly in a degraded mode. IoT devices and gateways are often expected to operate in always-on and unattended modes, using fault detection and unassisted recovery functions.</t>
        <t>The life cycle life-cycle management of services and applications on physical IoT gateways is generally cloud-based. cloud based.  Edge cloud management platforms and products (such as StarlingX, Akraino Edge Stack, or proprietary products from major Cloud cloud providers) adapt cloud management technologies (e.g., Kubernetes) to the edge cloud, that is, to smaller, distributed computing devices running outside a controlled data center. The  Typically, the service and application life-cycle life cycle is typically using an NFV-like management and orchestration model.</t>
        <t>The
   <t>   The platform typically generally enables advertising or consuming services
   hosted on the platform (e.g., the Mp1 interface in ETSI MEC supports
   service discovery and communication), and enables communication with
   local and remote endpoints (e.g., message routing function in IoT
   gateways).  The platform is typically usually extensible to edge applications
   because it can advertise a service that other edge applications can
   consume.  The IoT communication services include protocol translation, analytics, and transcoding.  Communication between edge-computing edge computing devices is enabled in tiered or distributed deployments.</t>
        <t>An edge cloud platform may enable pass-through without storage or local storage (e.g., on IoT gateways). Some edge cloud platforms use distributed storage such as that provided by a distributed storage platform (e.g., EdgeFS, Ceph), EdgeFS and Ceph) or, in more experimental settings, by an ICN Information-Centric Networking (ICN) network, for example, systems such as Chipmunk <xref target="chipmunk"/> target="Chipmunk"/> and Kua <xref target="kua"/> target="Kua"/> have been proposed as distributed information-centric objects stores.  External storage, for example, on databases in a distant or local IT cloud, is typically used for filtered data deemed worthy of long-term storage, although storage; although, in some cases cases, it may be for all data, for example example, when required for regulatory reasons.</t>
        <t>Stateful computing is supported the default on platforms that host native programs, most systems, VMs, or and containers. Stateless computing is supported on platforms providing a "serverless computing" service (also known as function-as-a-service, e.g., using stateless containers), containers) or on systems based on named function networking.</t>
        <t>In many IoT use cases, a typical network usage pattern is a high volume high-volume uplink with some form of traffic reduction enabled by processing over edge-computing edge computing devices. Alternatives to traffic reduction include deferred transmission (to off-peak hours or using physical shipping). Downlink traffic includes application control and software updates. Downlink-heavy traffic patterns are not excluded but are more often associated with non-IoT usage (e.g., video CDNs).</t> Content Delivery Networks (CDNs)).</t>
      </section>
      <section anchor="sec-model">
        <name>General Model</name>
        <t>Edge computing is expected to play an important role in deploying new IoT services integrated with Big Data big data and AI enabled by flexible in-network computing platforms.  Although there are many approaches to
   edge computing, in this section, we attempt to lay section lays out an attempt at a general
   model and the list lists associated logical functions. In practice, this model can be mapped to different architectures, such as:</t>

<!--[rfced] Might it be helpful to the reader to clarify the slash in
     cases like the following (i.e., does it stand for "and", "or", or
     "and/or"?)?  Note: this appears in several places, the following
     is just an example.

Original:
The IoT gateway plays a common role in providing access to a
heterogeneous set of IoT devices/sensors,...

Perhaps:
The IoT gateway plays a common role in providing access to a
heterogeneous set of IoT devices and sensors,...

-->
        <ul spacing="normal">
          <li>A single IoT gateway, or a hierarchy of IoT gateways, typically connected to the cloud (e.g., to extend the traditional centralized cloud-based management of IoT devices and data to the edge). The IoT gateway plays a common role in providing access to a heterogeneous set of IoT devices/sensors, handling IoT data, and delivering IoT data to its final destination in a cloud network. Whereas an  An IoT gateway requires interactions with the cloud, cloud; however, it can also operate independently in a disconnected mode.</li>
          <li>A set of distributed computing nodes, for example, embedded in switches, routers, edge cloud servers, or mobile devices. Some IoT devices have sufficient computing capabilities to participate in such distributed systems owing to advances in hardware technology. In this model, edge-computing edge computing nodes can collaborate to share resources.</li>
          <li>A hybrid system involving both IoT gateways and supporting functions in distributed computing nodes.</li>
        </ul>
        <t>In the general model described in <xref target="rl-fig1"/>, the edge computing domain is interconnected with IoT devices (southbound connectivity), possibly with a remote/cloud network (northbound connectivity), and with a service operator's system.  Edge-computing  Edge computing nodes provide multiple logical functions or components that may not be present in a given system. They may be implemented in a centralized or distributed fashion, at the network edge, or through interworking between the edge network and remote cloud networks.</t>

        <figure anchor="rl-fig1">
          <name>Model of IoT Edge Computing</name>
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            <artwork type="ascii-art" align="center"><![CDATA[
   +---------------------+
   |   Remote network Network    |  +---------------+
   |(e.g., cloud network)|  |   Service     |
   +-----------+---------+  |   Operator    |
               |            +------+--------+
               |                   |
+--------------+-------------------+-----------+
|            Edge Computing Domain             |
|                                              |
|   One or more Computing Nodes computing nodes                |
|   (IoT gateway, end devices, switches,       |
|   routers, mini/micro-data centers, etc.)    |
|                                              |
|   OAM Components                             |
|   - Resource Discovery and Authentication    |
|   - Edge Organization and Federation         |
|   - Multi-Tenancy and Isolation              |
|   - ...                                      |
|                                              |
|   Functional Components                      |
|   - In-Network Computation                   |
|   - Edge Caching                             |
|   - Communication                            |
|   - Other Services                           |
|   - ...                                      |
|                                              |
|   Application Components                     |
|   - IoT Devices Management                   |
|   - Data Management and Analytics            |
|   - ...                                      |
|                                              |
+------+--------------+-------- - - - -+- - - -+
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        </figure>
        <t>In the distributed model described in <xref target="rl-fig2"/>, the edge-computing edge computing domain is composed of IoT edge gateways and IoT devices which that are also used as computing nodes.  Edge computing domains are connected to a remote/cloud network and their respective service operator's system. IoT devices/computing nodes provide logical functions, for example example, as part of distributed machine learning or distributed image processing applications. The processing capabilities in IoT devices are limited; they require the support of other nodes, and in nodes.  In a distributed machine learning application, the training process for AI services can be executed at IoT edge gateways or cloud networks networks, and the prediction (inference) service is executed in the IoT devices. In  Similarly, in a distributed image processing application, some image processing
functions can be similarly executed at the edge or in the cloud, while preprocessing, which helps limiting cloud. To limit the amount of data to be uploaded data, is performed by the to central cloud functions, IoT device.</t> edge devices may pre-process data.</t>
        <figure anchor="rl-fig2">
          <name>Example:
          <name>Example of Machine Learning over a Distributed IoT Edge Computing System</name>
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+----------------------------------------------+
|            Edge Computing Domain             |
|                                              |
| +--------+    +--------+        +--------+   |
| |Compute |    |Compute |        |Compute |   |
| |node/End|    |node/End| |Node/End|    |Node/End|  ....  |node/End|  |Node/End|   |
| |device |Device 1|    |device    |Device 2|  ....  |device  |Device m|   |
| +----+---+    +----+---+        +----+---+   |
|      |             |                 |       |
|  +---+-------------+-----------------+--+    |
|  |           IoT Edge Gateway           |    |
|  +-----------+-------------------+------+    |
|              |                   |           |
+--------------+-------------------+-----------+
               |                   |
   +-----------+---------+  +------+-------+
   |   Remote network Network    |  |   Service    |
   |(e.g., cloud network)|  |  Operator(s) |
   +-----------+---------+  +------+-------+
               |                   |
+--------------+-------------------+-----------+
|              |                   |           |
|  +-----------+-------------------+------+    |
|  |           IoT Edge Gateway           |    |
|  +---+-------------+-----------------+--+    |
|      |             |                 |       |
| +----+---+    +----+---+        +----+---+   |
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| |device |Device 1|    |device    |Device 2|  ....  |device  |Device n|   |
| +--------+    +--------+        +--------+   |
|                                              |
|            Edge Computing Domain             |
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        </figure>
        <t>In the following, we enumerate major edge computing domain components. They Here, they are here loosely organized into OAM (Operations, Operations, Administration, and Maintenance), functional, Maintenance (OAM); functional; and application components, with the understanding that the distinction between these classes may not always be clear, depending on actual system architectures. Some representative research challenges are associated with those functions.  We used input from co-authors, IRTF attendees, coauthors, participants of T2TRG meetings, and some comprehensive reviews of the field (<xref target="Yousefpour"/>, <xref target="Zhang2"/>, and <xref target="Khan"/>).</t>
      </section>
      <section anchor="sec-components-oam">
        <name>OAM Components</name>
        <t>Edge computing OAM extends beyond the network-related OAM functions listed in <xref target="RFC6291"/>. In addition to infrastructure (network, storage, and computing resources), edge computing systems can also include computing environments (for VMs, software containers, and functions), IoT devices, data, and code.</t>
        <t>Operation-related functions include performance monitoring for service-level agreement Service Level Agreement (SLA) measurements, fault management management, and provisioning for links, nodes, compute and storage resources, platforms, and services. Administration covers network/compute/storage resources, platforms platform and services service discovery, configuration, and planning. Discovery during normal operation (e.g., discovery of compute or storage nodes by endpoints) is typically not included in OAM; however, in this document, we do not address it separately. Management covers the monitoring and diagnostics of failures, as well as means to minimize their occurrence and take corrective actions. This may include software update management and high service availability through redundancy and multipath communication. Centralized (e.g., SDN) Software-Defined Networking (SDN)) and decentralized management systems can be used. Finally, we arbitrarily chose to address data management as an application component, component; however, in some systems, data management may be considered similar to a network management function.</t>
        <t>We further detail a few relevant OAM components.</t>
        <section anchor="sec-dis-auth">
          <name>Resource Discovery and Authentication</name>
          <t>Discovery and authentication may target platforms and , infrastructure resources, such as computing, networking, and storage, as well as other resources resources, such as IoT devices, sensors, data, code units, services, applications, and users interacting with the system. Broker-based solutions can be used, for example, using In a broker-based system, an IoT gateway can act as a broker to discover IoT resources. More decentralized solutions can also be used in replacement of or complement, in complement to the broker-based solutions; for example, CoAP enables multicast discovery of an IoT device, device and CoAP service discovery enables obtaining one to obtain a list of resources made available by this device <xref target="RFC7252"/>. For device authentication, current centralized gateway-based systems rely on the installation of a secret on IoT devices and computing devices (e.g., a device certificate stored in a hardware security module, module or a combination of code and data stored in a trusted execution environment).</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
            <li>Discovery, authentication, and trust establishment between IoT devices, compute nodes, and platforms, with regard to concerns such as mobility, heterogeneous devices and networks, scale, multiple trust domains, constrained devices, anonymity, and traceability.</li>
            <li>Intermittent connectivity to the Internet, removing the need to rely on a third-party authority <xref target="Echeverria"/>.</li>
            <li>Resiliency to failure <xref target="Harchol"/>, denial of service denial-of-service attacks, and easier physical access for attackers.</li>
          </ul>
        </section>
        <section anchor="edge-organization-and-federation">
          <name>Edge Organization and Federation</name>
          <t>In a distributed system context, once edge devices have discovered and authenticated each other, they can be organized, organized or self-organized, self-organized into hierarchies or clusters. The organizational structure may range from centralized to peer-to-peer, or it may be closely tied to other systems. Such groups can also form federations with other edges or with remote clouds.</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
            <li>Support for scaling, scaling and enabling fault-tolerance fault tolerance or self-healing <xref target="Jeong"/>. In addition to using a hierarchical organization to cope with scaling, another available and possibly complementary mechanism is multicast (<xref <xref target="RFC7390"/> <xref target="I-D.ietf-core-groupcomm-bis"/>). target="I-D.ietf-core-groupcomm-bis"/>. Other approaches include relying on blockchains <xref target="Ali"/>.</li>
            <li>Integration of edge computing with virtualized Radio Access Networks (Fog RAN) <xref target="I-D.bernardos-sfc-fog-ran"/> and 5G access networks.</li>
            <li>Sharing resources in multi-vendor/operator scenarios, scenarios to optimize criteria such as profit <xref target="Anglano"/>, resource usage, latency, and energy consumption.</li>
            <li>Capacity planning, placement of infrastructure nodes to minimize delay <xref target="Fan"/>, cost, energy, etc.</li>
            <li>Incentives for participation, for example, in peer-to-peer federation schemes.</li>
            <li>Design of federated AI over IoT edge computing systems <xref target="Brecko"/>, for example, for anomaly detection.</li>
          </ul>
        </section>
        <section anchor="multi-tenancy-and-isolation">
          <name>Multi-Tenancy and Isolation</name>
          <t>Some IoT edge computing systems make use of virtualized (compute, storage storage, and networking) resources to address the need for secure multi-tenancy at the edge. This leads to "edge clouds" that share properties with remotes remote clouds and can reuse some of their ecosystems. Virtualization function management is largely covered by ETSI NFV and MEC standards and recommendations. Projects such as <xref target="LFEDGE-EVE"/> further cover virtualization and its management in distributed edge-computing edge computing settings.</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
        <li>Adapting cloud management platforms to the edge, edge to account for its distributed nature, e.g., heterogeneity, need for customization, and limited resources (for example, using Conflict-free Replicated Data Types (CRDT) (CRDTs) <xref target="Jeffery"/>, heterogeneity and customization, e.g., using target="Jeffery"/> or intent-based management mechanisms <xref target="Cao"/>, and limited resources.</li> target="Cao"/>).</li>
            <li>Minimizing virtual function instantiation time and resource usage.</li>
          </ul>
        </section>
      </section>
      <section anchor="sec-components-functional">
        <name>Functional Components</name>
        <section anchor="in-network-computation">
          <name>In-Network Computation</name>
          <t>A core function of IoT edge computing is to enable local computation on a node at the network edge, typically for application-layer processing, such as processing input data from sensors, making local decisions, preprocessing data, and offloading computation on behalf of a device, service, or user. Related functions include orchestrating computation (in a centralized or distributed manner) and managing application lifecycles. life cycles. Support for in-network computation may vary in terms of capability, capability; for example, computing nodes can host virtual machines, software containers, software actors, uni-kernels unikernels running stateful or stateless code, or a rule engine providing an API to register actions in response to conditions such (such as an IoT device ID, sensor values to check, thresholds, etc.</t> etc.).</t>
          <t>Edge offloading includes offloading to and from an IoT device, device and to and from a network node. <xref target="Cloudlets"/> offer describes an example of offloading computation from an end device to a network node. In contrast, oneM2M is an example of a system that allows a cloud-based IoT platform to transfer resources and tasks to a target edge node <xref target="oneM2M-TR0052"/>. Once transferred, the edge node can directly support IoT devices that it serves with the service offloaded by the cloud (e.g., group management, location management, etc.).</t>
          <t>QoS can be provided in some systems through the combination of network QoS (e.g., traffic engineering or wireless resource scheduling) and compute/storage resource allocations. For example, in some systems, a bandwidth manager service can be exposed to enable allocation of the bandwidth to/from an edge-computing edge computing application instance.</t>
          <t>In-network computation can leverage the underlying services, services provided using data generated by IoT devices and access networks. Such services include IoT device location, radio network information, bandwidth management management, and congestion management (e.g., the congestion management feature of oneM2M <xref target="oneM2M-TR0052"/>).</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
            <li>(Computation placement) Selecting,
            <li>Computation placement: in a centralized or
   distributed/peer-to-peer manner, selecting an appropriate compute device
   device.  The selection is based on available resources, location of
   data input and data sinks, compute node properties, etc., and etc. with
   varying goals.  These goals including include end-to-end latency, privacy, high
   availability, energy conservation, or network efficiency, for efficiency (for
   example, using load-balancing techniques to avoid congestion.</li> congestion).</li>
            <li>Onboarding code on a platform or computing device, device and invoking remote code execution, possibly as part of a distributed programming model and with respect to similar concerns of latency, privacy, etc.: etc. For example, offloading can be included in a vehicular scenario <xref target="Grewe"/>. These operations should deal with heterogeneous compute nodes <xref target="Schafer"/>, target="Schafer"/> and may also support end devices, including IoT devices, as compute nodes <xref target="Larrea"/>.</li>
            <li>Adapting Quality of Results (QoR) for applications where a perfect result is not necessary <xref target="Li"/>.</li>
            <li>Assisted or automatic partitioning of code: for code. For example, for application programs <xref target="I-D.sarathchandra-coin-appcentres"/> or network programs <xref target="I-D.hsingh-coinrg-reqs-p4comp"/>.</li>
            <li>Supporting computation across trust domains: for domains. For example, verifying computation results.</li>
            <li>Support for
            <li>Supporting computation mobility: relocating an instance from one compute node to another, another while maintaining a given service level; session continuity when communicating with end devices that are mobile, possibly at high speed (e.g., in vehicular scenarios); defining lightweight execution environments for secure code mobility, for example, using WebAssembly <xref target="Nieke"/>.</li>
            <li>Defining, managing, and verifying Service Level Agreements (SLA) SLAs for edge-computing systems: edge computing systems; pricing is a challenging task.</li>
          </ul>
        </section>
        <section anchor="edge-storage-and-caching">
          <name>Edge Storage and Caching</name>
          <t>Local storage or caching enables local data processing (e.g., preprocessing or analysis) as well as delayed data transfer to the cloud or delayed physical shipping.  An edge node may offer local data storage (in which persistence is subject to retention policies), caching, or both.  Caching generally  Generally, "caching" refers to temporary storage to improve performance without persistence guarantees.  An edge-caching component manages data persistence, persistence; for example, it schedules the removal of data when it is no longer needed.  Other related aspects include the authentication and encryption of data.  Edge storage and caching can take the form of a distributed storage systems.</t> system.</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
            <li>(Cache
            <li>Cache and data placement) Using placement: using cache positioning and data placement strategies to minimize data retrieval delay <xref target="Liu"/> and energy consumption. Caches may be positioned in the access network access-network infrastructure or on end devices.</li>
            <li>Maintaining consistency, freshness, reliability, and privacy of stored/cached data in systems that are distributed, constrained, and dynamic (e.g., owing due to end devices node mobility, energy-saving regimes, and computing nodes churn or mobility), disruptions) and which can have additional data governance constraints on data storage location. For example, <xref target="Mortazavi"/> leverages describes leveraging a hierarchical storage organization. Freshness-related metrics include the age of information <xref target="Yates"/> that captures the timeliness of information received from a sender (e.g., an IoT device).</li>
          </ul>
        </section>
        <section anchor="communication">
          <name>Communication</name>
          <t>An edge cloud may provide a northbound data plane or management plane interface to a remote network, such as a cloud, home home, or enterprise network. This interface does not exist in stand-alone (local-only) scenarios. To support such an interface when it exists, an edge computing component needs to expose an API, deal with authentication and authorization, and support secure communication.</t>
          <t>An edge cloud may provide an API or interface to local or mobile users, for example, to provide access to services and applications, applications or to manage data published by local/mobile devices.</t>
          <t>Edge-computing
          <t>Edge computing nodes communicate with IoT devices over a southbound interface, typically for data acquisition and IoT device management.</t>
<t>Communication brokering is a typical function of IoT edge computing
that facilitates communication with IoT devices, enabling enables clients to
register as recipients for data from devices, as well as forwarding/routing of forwards
traffic to or from IoT devices, enabling enables various data discovery and
redistribution patterns, for patterns (for example, north-south with clouds, clouds and
east-west with other edge devices <xref target="I-D.mcbride-edge-data-discovery-overview"/>. target="I-D.mcbride-edge-data-discovery-overview"/>).  Another related aspect is dispatching alerts and notifications to interested consumers both inside and outside the edge-computing edge computing domain.  Protocol translation, analytics, and video transcoding can also be performed when necessary. Communication brokering may be centralized in some systems, for example, using a hub-and-spoke message broker, broker or distributed with message buses, possibly in a layered bus approach.  Distributed systems can leverage direct communication between end devices over device-to-device links.  A broker can ensure communication reliability and traceability and, in some cases, transaction management.</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
            <li>Defining edge computing abstractions, such as PaaS <xref target="Yangui"/>, suitable for users and cloud systems to interact with edge computing systems and dealing with interoperability issues issues, such as data model data-model heterogeneity.</li>
            <li>Enabling secure and resilient communication between IoT devices and a remote cloud, for example, through multipath support.</li>
          </ul>
        </section>
      </section>
      <section anchor="sec-components-app">
        <name>Application Components</name>
        <t>IoT edge computing can host applications, such as those mentioned in <xref target="sec-uc"/>. While describing the components of individual applications is out of our scope, some of those applications share similar functions, such as IoT device management and data management, as described below.</t>
        <section anchor="iot-device-management">
          <name>IoT Device Management</name>
          <t>IoT device management includes managing information regarding IoT devices, including their sensors, sensors and how to communicate with them. Edge computing addresses the scalability challenges of a large number of IoT devices by separating the scalability domain into edge/local networks and remote networks. For example, in the context of the oneM2M standard, a device management functionality (called "software campaign" in oneM2M) enables the installation, deletion, activation, and deactivation of software functions/services on a potentially large number of edge nodes <xref target="oneM2M-TR0052"/>. Using a dashboard or management software, a service provider issues these requests through an IoT cloud platform supporting the software campaign functionality.</t>
          <t>Challenges
          <t>The challenges listed in <xref target="sec-dis-auth"/> may be applicable to IoT devices device management as well.</t>
        </section>
        <section anchor="sec-data">
          <name>Data Management and Analytics</name>
          <t>Data storage and processing at the edge are major aspects of IoT edge computing, directly addressing the high-level IoT challenges listed in <xref target="sec-challenges"/>. Data analysis, for example, through AI/ML tasks performed at the edge, may benefit from specialized hardware support on the computing nodes.</t>
          <t>Related challenges include:</t>
          <ul spacing="normal">
            <li>Addressing concerns regarding resource usage, security, and privacy when sharing, processing, discovering, or managing data: for example example, presenting data in views composed of an aggregation of related data <xref target="Zhang"/>; target="Zhang"/>, protecting data communication between authenticated peers <xref target="Basudan"/>, classifying data (e.g., in terms of privacy, importance, and validity), and compressing and encrypting data, for example, using homomorphic encryption to directly process encrypted data <xref target="Stanciu"/>.</li>
            <li>Other concerns regarding edge data discovery (e.g., streaming data, metadata, and events) include siloization and lack of standards in edge environments that can be dynamic (e.g., vehicular networks) and heterogeneous <xref target="I-D.mcbride-edge-data-discovery-overview"/>.</li>
            <li>Data-driven programming models <xref target="Renart"/>, for example, event-based, those that are event based, including handling naming and data abstractions.</li>
            <li>Data integration in an environment that without data standardization, standardization or where different sources use different ontologies <xref target="Farnbauer-Schmidt"/>.</li>
            <li>Addressing concerns such as limited resources, privacy, dynamic, and dynamic and heterogeneous environments to deploy machine learning at the edge: for example, making machine learning more lightweight and distributed (e.g., enabling distributed inference at the edge), supporting shorter training times and simplified models, and supporting models that can be compressed for efficient communication <xref target="Murshed"/>.</li>
            <li>Although edge computing can support IoT services independently of cloud computing, it can also be connected to cloud computing. Thus, the relationship between IoT edge computing and cloud computing, with regard to data management, is another potential challenge <xref target="ISO_TR"/>.</li>
          </ul>
        </section>
      </section>
      <section anchor="simulation-and-emulation-environments">
        <name>Simulation and Emulation Environments</name>
        <t>IoT Edge Computing edge computing introduces new challenges to the simulation and emulation tools used by researchers and developers. A varied set of applications, networks, and computing technologies can coexist in a distributed system, making modeling difficult. Scale, mobility, and resource management are additional challenges <xref target="SimulatingFog"/>.</t>
        <t>Tools include simulators, where simplified application logic runs on top of a fog network model, and emulators, where actual applications can be deployed, typically in software containers, over a cloud infrastructure (e.g., Docker and Kubernetes) running over a network emulating network edge conditions conditions, such as variable delays, throughput throughput,  and mobility events. To gain in scale, emulated and simulated systems can be used together in hybrid federation-based approaches <xref target="PseudoDynamicTesting"/>, target="PseudoDynamicTesting"/>; whereas to gain in realism, physical devices can be interconnected with emulated systems. Examples of related work and platforms include the publicly accessible MEC sandbox work recently initiated in ETSI <xref target="ETSI_Sandbox"/>, target="ETSI_Sandbox"/> and open source open-source simulators and emulators (<xref target="AdvantEDGE"/> emulator and tools cited in <xref target="SimulatingFog"/>). EdgeNet <xref target="Senel"/> is a globally distributed edge cloud for Internet researchers, using which uses nodes contributed by institutions, institutions and which is based on Docker for containerization and Kubernetes for deployment and node management.</t>
        <t>Digital twins are virtual instances of a physical system (twin) that are continually updated with the latter's performance, maintenance, and health status data throughout the life cycle of the physical system. system <xref target="Madni"/>. In contrast to a traditional an emulation or simulated environment, digital twins, once generated, are maintained in sync by their physical twin, which can be, among many other instances, an IoT device, edge device, or an edge network. The benefits of digital twins go beyond those of emulation and include accelerated business processes, enhanced productivity, and faster innovation with reduced costs <xref target="I-D.irtf-nmrg-network-digital-twin-arch"/>.</t>
      </section>
    </section>
    <section anchor="security-considerations">
      <name>Security Considerations</name>
      <t>Privacy and security are drivers of the adoption of edge computing for the IoT (<xref target="sec-priv"/>). As discussed in <xref target="sec-dis-auth"/>, authentication and trust (among computing nodes, management nodes, and end devices) can be challenging as scale, mobility, and heterogeneity increase. The sometimes disconnected nature of edge resources can avoid reliance on third-party authorities. Distributed edge computing is exposed to reliability and denial of service denial-of-service attacks. Personal A personal or proprietary IoT data leakage is also a major threat, particularly because of the distributed nature of the systems (<xref target="sec-data"/>). Furthermore, blockchain-based distributed IoT edge computing must be designed for privacy, since public blockchain addressing does not guarantee absolute anonymity <xref target="Ali"/>.</t>
      <t>However, edge computing also offers solutions in the security space: maintaining privacy by computing sensitive data closer to data generators is a major use case for IoT edge computing.  An edge cloud can be used to perform actions based on sensitive data or to anonymize or aggregate data prior to transmission to a remote cloud server. Edge computing communication brokering functions can also be used to secure communication between edge and cloud networks.</t>
    </section>
    <section anchor="conclusion">
      <name>Conclusion</name>
      <t>IoT edge computing plays an essential role, complementary to the cloud, in enabling IoT systems in certain situations. In this document, we presented use cases and listing listed the core challenges faced by the IoT that drive the need for IoT edge computing. The  Therefore, the first part of this document may therefore help focus future research efforts on the aspects of IoT edge computing where it is most useful. The second part of this document presents a general system model and structured overview of the associated research challenges and related work. The structure, based on the system model, is not meant to be restrictive and exists for the purpose of having a link between individual research areas and where they are applicable in an IoT edge computing system.</t>
    </section>
    <section anchor="iana-considerations">
      <name>IANA Considerations</name>
      <t>This document has no IANA actions.</t>
    </section>
    <section anchor="acknowledgements">
      <name>Acknowledgements</name>
      <t>The authors would like to thank Joo-Sang Youn, Akbar Rahman, Michel Roy, Robert Gazda, Rute Sofia, Thomas Fossati, Chonggang Wang, <contact fullname="Marie-José Montpetit"/>, Carlos J. Bernardos, Milan Milenkovic, Dale Seed, JaeSeung Song, Roberto Morabito, Carsten Bormann and <contact fullname="Ari Keränen"/> for their valuable comments and suggestions on this document.</t>
    </section>
  </middle>
  <back>

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<displayreference target="I-D.irtf-t2trg-rest-iot" to="REST-IOT"/>
<displayreference target="I-D.bernardos-sfc-fog-ran" to="SFC-FOG-RAN"/>
<displayreference target="I-D.ietf-core-groupcomm-bis" to="CORE-GROUPCOMM-BIS"/>
<displayreference target="I-D.sarathchandra-coin-appcentres" to="COIN-APPCENTRES"/>
<displayreference target="I-D.defoy-t2trg-iot-edge-computing-background" to="EDGE-COMPUTING-BACKGROUND"/>
<displayreference target="I-D.irtf-nmrg-network-digital-twin-arch" to="NETWORK-DIGITAL-TWIN-ARCH"/>
<displayreference target="I-D.hsingh-coinrg-reqs-p4comp" to="REQS-P4COMP"/>

    <references>
      <name>Informative References</name>
      <reference anchor="I-D.mcbride-edge-data-discovery-overview">
        <front>
          <title>Edge Data Discovery for COIN</title>
          <author fullname="Mike McBride" initials="M." surname="McBride">
            <organization>Futurewei</organization>
          </author>
          <author fullname="Dirk Kutscher" initials="D." surname="Kutscher">
            <organization>Emden University</organization>
          </author>
          <author fullname="Eve Schooler" initials="E." surname="Schooler">
            <organization>Intel</organization>
          </author>
          <author fullname="Carlos J. Bernardos" initials="C. J." surname="Bernardos">
            <organization>Universidad Carlos III de Madrid</organization>
          </author>
          <author fullname="Diego Lopez" initials="D." surname="Lopez">
            <organization>Telefonica</organization>
          </author>
          <author fullname="Xavier de Foy" initials="X." surname="de Foy">
            <organization>InterDigital Communications, LLC</organization>
          </author>
          <date day="1" month="November" year="2020"/>
          <abstract>
            <t>   This document describes the problem of distributed data discovery in
   edge computing, and in particular for computing-in-the-network
   (COIN), which may require both the marshalling of data at the outset
   of a computation and the persistence of the resultant data after the
   computation.  Although the data might originate at the network edge,
   as more and more distributed data is created, processed, and stored,
   it becomes increasingly dispersed throughout the network.  There
   needs to be a standard way to find it.  New and existing protocols
   will need to be developed to support distributed data discovery at
   the network edge and beyond.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-mcbride-edge-data-discovery-overview-05"/>
      </reference>
      <reference anchor="RFC6291">
        <front>
          <title>Guidelines for the Use of the "OAM" Acronym in the IETF</title>
          <author fullname="L. Andersson" initials="L." surname="Andersson"/>
          <author fullname="H. van Helvoort" initials="H." surname="van Helvoort"/>
          <author fullname="R. Bonica" initials="R." surname="Bonica"/>
          <author fullname="D. Romascanu" initials="D." surname="Romascanu"/>
          <author fullname="S. Mansfield" initials="S." surname="Mansfield"/>
          <date month="June" year="2011"/>
          <abstract>
            <t>At first glance, the acronym "OAM" seems to be well-known and well-understood. Looking at the acronym a bit more closely reveals a set of recurring problems that are revisited time and again.</t>
            <t>This document provides a definition of the acronym "OAM" (Operations, Administration, and Maintenance) for use in all future IETF documents that refer to OAM. There are other definitions and acronyms that will be discussed while exploring the definition of the constituent parts of the "OAM" term. This memo documents an Internet Best Current Practice.</t>
          </abstract>
        </front>
        <seriesInfo name="BCP" value="161"/>
        <seriesInfo name="RFC" value="6291"/>
        <seriesInfo name="DOI" value="10.17487/RFC6291"/>
      </reference>
      <reference anchor="RFC8578">
        <front>
          <title>Deterministic Networking Use Cases</title>
          <author fullname="E. Grossman" initials="E." role="editor" surname="Grossman"/>
          <date month="May" year="2019"/>
          <abstract>
            <t>This document presents use cases for diverse industries that have in common a need for "deterministic flows". "Deterministic" in this context means that such flows provide guaranteed bandwidth, bounded latency, and other properties germane to the transport of time-sensitive data. These use cases differ notably in their network topologies and specific desired behavior, providing as a group broad industry context for Deterministic Networking (DetNet). For each use case, this document will identify the use case, identify representative solutions used today, and describe potential improvements that DetNet can enable.</t>
          </abstract>
        </front>
        <seriesInfo name="RFC" value="8578"/>
        <seriesInfo name="DOI" value="10.17487/RFC8578"/>
      </reference>
      <reference anchor="I-D.irtf-t2trg-rest-iot">
        <front>
          <title>Guidance on RESTful Design for Internet of Things Systems</title>
          <author fullname="Ari Keränen" initials="A." surname="Keränen">
            <organization>Ericsson</organization>
          </author>
          <author fullname="Matthias Kovatsch" initials="M." surname="Kovatsch">
            <organization>Siemens</organization>
          </author>
          <author fullname="Klaus Hartke" initials="K." surname="Hartke">
         </author>
          <date day="25" month="July" year="2023"/>
          <abstract>
            <t>   This document gives guidance for designing Internet of Things (IoT)
   systems that follow the principles of the Representational State
   Transfer (REST) architectural style.  This document is a product of
   the IRTF Thing-to-Thing Research Group (T2TRG).

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-irtf-t2trg-rest-iot-12"/>
      </reference>

<!-- [I-D.mcbride-edge-data-discovery-overview] IESG state Expired -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.mcbride-edge-data-discovery-overview.xml"/>

<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6291.xml"/>
<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8578.xml"/>

<!-- [I-D.irtf-t2trg-rest-iot] IESG state I-D Exists -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.irtf-t2trg-rest-iot.xml"/>

      <reference anchor="Ashton" target="http://www.itrco.jp/libraries/RFIDjournal-That%20Internet%20of%20Things%20Thing.pdf">
        <front>
          <title>That Internet 'Internet of Things thing</title> Things' Thing</title>
          <author initials="K." surname="Ashton"> surname="Ashton" fullname="Kevin Ashton">
            <organization/>
          </author>
          <date year="2009"/> year="2009" month="June"/>
        </front>
        <refcontent>RFID J. Journal, vol. 22, no. 7, pp. 97-114</refcontent>
      </reference>

      <reference anchor="Lin">
        <front>
          <title>A Survey on Internet of Things: Architecture, Enabling Technologies, Security and Privacy, and Applications</title>
          <author initials="J." surname="Lin" fullname="Jie Lin">
            <organization/>
          </author>
          <author initials="W." surname="Yu" fullname="Wei Yu">
            <organization/>
          </author>
          <author initials="N." surname="Zhang" fullname="Nan Zhang">
            <organization/>
          </author>
          <author initials="X." surname="Yang" fullname="Xinyu Yang">
            <organization/>
          </author>
          <author initials="H." surname="Zhang" fullname="Hanlin Zhang">
            <organization/>
          </author>
          <author initials="W." surname="Zhao" fullname="Wei Zhao">
            <organization/>
          </author>
          <date year="2017" month="October"/>
        </front>
        <seriesInfo name="IEEE
	<refcontent>IEEE Internet of Things Journal" value="vol. Journal, vol. 4, no. 5, pp. 1125-1142"/> 1125-1142</refcontent>
        <seriesInfo name="DOI" value="10.1109/jiot.2017.2683200"/>
      </reference>

      <reference anchor="NIST">
        <front>
          <title>The NIST definition Definition of cloud computing</title> Cloud Computing</title>
          <author initials="P." surname="Mell" fullname="P M fullname="Peter Mell">
            <organization/>
          </author>
          <author initials="T." surname="Grance" fullname="T fullname="Timothy Grance">
            <organization/>
          </author>
          <date year="2011"/> year="2011" month="September"/>
        </front>
	<seriesInfo name="National Institute of Standards and Technology" value="report"/> name="NIST Special Publication" value="800-145"/>
        <seriesInfo name="DOI" value="10.6028/nist.sp.800-145"/>
      </reference>

      <reference anchor="Botta">
        <front>
          <title>Integration of Cloud computing and Internet of Things: A survey</title>
          <author initials="A." surname="Botta" fullname="Alessio Botta">
            <organization/>
          </author>
          <author initials="W." surname="de Donato" fullname="Walter de Donato">
            <organization/>
          </author>
          <author initials="V." surname="Persico" fullname="Valerio Persico">
            <organization/>
          </author>
          <author initials="A." surname="Pescape" surname="Pescapé" fullname="Antonio Pescape"> Pescapé">
            <organization/>
          </author>
          <date year="2016" month="March"/>
        </front>
        <seriesInfo name="Future
        <refcontent>Future Generation Computer Systems" value="vol. Systems, vol. 56, pp. 684-700"/> 684-700</refcontent>
        <seriesInfo name="DOI" value="10.1016/j.future.2015.09.021"/>
      </reference>

      <reference anchor="Shi">
        <front>
          <title>Edge Computing: Vision and Challenges</title>
          <author initials="W." surname="Shi" fullname="Weisong Shi">
            <organization/>
          </author>
          <author initials="J." surname="Cao" fullname="Jie Cao">
            <organization/>
          </author>
          <author initials="Q." surname="Zhang" fullname="Quan Zhang">
            <organization/>
          </author>
          <author initials="Y." surname="Li" fullname="Youhuizi Li">
            <organization/>
          </author>
          <author initials="L." surname="Xu" fullname="Lanyu Xu">
            <organization/>
          </author>
          <date year="2016" month="October"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Internet of Things Journal" value="vol. Journal, vol. 3, no. 5, pp. 637-646"/> 637-646</refcontent>
        <seriesInfo name="DOI" value="10.1109/jiot.2016.2579198"/>
      </reference>

      <reference anchor="Mahadev">
        <front>
          <title>The Emergence of Edge Computing</title>
          <author initials="M." surname="Satyanarayanan" fullname="Mahadev Satyanarayanan">
            <organization/>
          </author>
          <date year="2017" month="January"/>
        </front>
        <seriesInfo name="Computer" value="vol.
        <refcontent>Computer, vol. 50, no. 1, pp. 30-39"/> 30-39</refcontent>
        <seriesInfo name="DOI" value="10.1109/mc.2017.9"/>
      </reference>

      <reference anchor="Chiang">
        <front>
          <title>Fog and IoT: An Overview of Research Opportunities</title>
          <author initials="M." surname="Chiang" fullname="Mung Chiang">
            <organization/>
          </author>
          <author initials="T." surname="Zhang" fullname="Tao Zhang">
            <organization/>
          </author>
          <date year="2016" month="December"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Internet of Things Journal" value="vol. Journal, vol. 3, no. 6, pp. 854-864"/> 854-864</refcontent>
        <seriesInfo name="DOI" value="10.1109/jiot.2016.2584538"/>
      </reference>

      <reference anchor="Weiner">
        <front>
          <title>Design of a low-latency, high-reliability wireless communication system for control applications</title>
          <author initials="M." surname="Weiner" fullname="Matthew Weiner">
            <organization/>
          </author>
          <author initials="M." surname="Jorgovanovic" fullname="Milos Jorgovanovic">
            <organization/>
          </author>
          <author initials="A." surname="Sahai" fullname="Anant Sahai">
            <organization/>
          </author>
          <author initials="B." surname="Nikolie" fullname="Borivoje Nikolie">
            <organization/>
          </author>
          <date year="2014" month="June"/>
        </front>
        <seriesInfo name="2014
        <refcontent>2014 IEEE International Conference on Communications" value="(ICC)"/> Communications (ICC)</refcontent>
        <seriesInfo name="DOI" value="10.1109/icc.2014.6883918"/>
      </reference>

      <reference anchor="Kelly" target="https://campustechnology.com/articles/2015/04/15/internet-of-things-data-to-top-1-6-zettabytes-by-2020.aspx">
        <front>
          <title>Internet of Things Data to Top 1.6 Zettabytes by 2022</title> 2020</title>
          <author initials="R." surname="Kelly"> surname="Kelly" fullname="Rhea Kelly">
            <organization/>
          </author>
          <date year="2015"/> year="2015" month="April"/>
        </front>
        <refcontent>Retrieved
        <annotation>Retrieved on 2022-05-24</refcontent> 2022-05-24.</annotation>
      </reference>

      <reference anchor="ISO_TR" target="https://www.iso.org/standard/53284.html">
        <front>
          <title>Internet of things (IoT) - Edge computing</title>
          <author>
            <organization/>
          </author>
          <date year="2020"/> year="2020" month="April"/>
        </front>
        <seriesInfo name="ISO/IEC" value="TR 30164"/> 30164:2020"/>
      </reference>

      <reference anchor="OpenFog" target="https://iiconsortium.org/pdf/OpenFog_Reference_Architecture_2_09_17.pdf">
        <front>
          <title>OpenFog Reference Architecture for Fog Computing</title>
          <author>
            <organization/>
            <organization>OpenFog Consortium</organization>
          </author>
          <date year="2017"/> year="2017" month="February"/>
        </front>
        <refcontent>OpenFog Consortium</refcontent>
      </reference>

      <reference anchor="ETSI_MEC_03" target="https://www.etsi.org/deliver/etsi_gs/MEC/001_099/003/02.01.01_60/gs_MEC003v020101p.pdf">
        <front>
          <title>Mobile
          <title>Multi-access Edge Computing (MEC); Framework and Reference Architecture</title>
          <author>
            <organization>ETSI</organization>
          </author>
          <date year="2019"/> year="2019" month="January"/>
        </front>
        <refcontent>ETSI GS MEC 003</refcontent>
	<seriesInfo name="ETSI GS" value="MEC 003"/>
	<refcontent>V2.1.1</refcontent>
      </reference>

      <reference anchor="ETSI_MEC_01" target="https://www.etsi.org/deliver/etsi_gs/MEC/001_099/001/02.01.01_60/gs_MEC001v020101p.pdf">
        <front>
          <title>Multi-access Edge Computing (MEC); Terminology</title>
          <author initials="" surname="ETSI">
            <organization/>
          <author>
            <organization>ETSI</organization>
          </author>
          <date year="2019"/> year="2019" month="January"/>
        </front>
        <refcontent>ETSI GS MEC 001</refcontent>
	<seriesInfo name="ETSI GS" value="MEC 001"/>
        <refcontent>V2.1.1</refcontent>
      </reference>

      <reference anchor="NVIDIA" target="https://devblogs.nvidia.com/training-self-driving-vehicles-challenge-scale/">
        <front>
          <title>Training AI for Self-Driving Vehicles: the Challenge of Scale</title>
          <author initials="A." surname="Grzywaczewski"> surname="Grzywaczewski" fullname="Adam Grzywaczewski">
            <organization/>
          </author>
          <date year="2017"/> year="2017" month="October"/>
        </front>
        <refcontent>NVIDIA Developer Blog, retrieved Blog</refcontent>
	<annotation>Retrieved on 2022-05-24</refcontent> 2022-05-24.</annotation>
      </reference>

      <reference anchor="_60802" anchor="IEC_IEEE_60802" target="https://grouper.ieee.org/groups/802/1/files/public/docs2018/60802-industrial-use-cases-0918-v13.pdf">
        <front>
          <title>Use Cases IEC/IEEE 60802 V1.3</title> 60802</title>
          <author>
            <organization>IEC/IEEE</organization>
          </author>
          <date year="2018"/> year="2018" month="September"/>
        </front>
        <seriesInfo name="IEC/IEEE" value="60802"/>
	<refcontent>V1.3</refcontent>
      </reference>

      <reference anchor="ENERGY">
        <front>
          <title>Revealing household characteristics from smart meter data</title>
          <author initials="C." surname="Beckel" fullname="Christian Beckel">
            <organization/>
          </author>
          <author initials="L." surname="Sadamori" fullname="Leyna Sadamori">
            <organization/>
          </author>
          <author initials="T." surname="Staake" fullname="Thorsten Staake">
            <organization/>
          </author>
          <author initials="S." surname="Santini" fullname="Silvia Santini">
            <organization/>
          </author>
          <date year="2014" month="December"/>
        </front>
        <seriesInfo name="Energy" value="vol.
        <refcontent>Energy, vol. 78, pp. 397-410"/> 397-410</refcontent>
        <seriesInfo name="DOI" value="10.1016/j.energy.2014.10.025"/>
      </reference>

      <reference anchor="ETSI_Sandbox" target="https://portal.etsi.org/webapp/WorkProgram/Report_WorkItem.asp?WKI_ID=57671">
        <front>
          <title>Multi-access Edge Computing (MEC) MEC Sandbox Work Item</title> Sandbox</title>
          <author>
            <organization/>
            <organization>ETSI</organization>
          </author>
          <date year="2020"/> year="2023" month="September"/>
        </front>
        <refcontent>Portal</refcontent>
      </reference>

      <reference anchor="AdvantEDGE" target="https://github.com/InterDigitalInc/AdvantEDGE">
        <front>
          <title>Mobile
          <title>AdvantEDGE, Mobile Edge Emulation Platform</title>
          <author>
            <organization/>
          </author>
          <date year="2020"/> year="2023" month="May"/>
        </front>
        <refcontent>Source Code Repository</refcontent>
        <refcontent>commit 8f6edbe</refcontent>
      </reference>

      <reference anchor="SimulatingFog">
        <front>
          <title>Simulating Fog and Edge Computing Scenarios: An Overview and Research Challenges</title>
          <author initials="S." surname="Svorobej" fullname="Sergej Svorobej">
            <organization/>
          </author>
          <author initials="P." surname="Takako Endo" fullname="Patricia Takako Endo">
            <organization/>
          </author>
          <author initials="M." surname="Bendechache" fullname="Malika Bendechache">
            <organization/>
          </author>
          <author initials="C." surname="Filelis-Papadopoulos" fullname="Christos Filelis-Papadopoulos">
            <organization/>
          </author>
          <author initials="K." surname="Giannoutakis" fullname="Konstantinos Giannoutakis">
            <organization/>
          </author>
          <author initials="G." surname="Gravvanis" fullname="George Gravvanis">
            <organization/>
          </author>
          <author initials="D." surname="Tzovaras" fullname="Dimitrios Tzovaras">
            <organization/>
          </author>
          <author initials="J." surname="Byrne" fullname="James Byrne">
            <organization/>
          </author>
          <author initials="T." surname="Lynn" fullname="Theo Lynn">
            <organization/>
          </author>
          <date year="2019" month="February"/>
        </front>
        <seriesInfo name="Future Internet" value="vol.
        <refcontent>Future Internet, vol. 11, no. 3, pp. 55"/> 55</refcontent>
        <seriesInfo name="DOI" value="10.3390/fi11030055"/>
      </reference>

      <reference anchor="PseudoDynamicTesting">
        <front>
          <title>Pseudo-Dynamic Testing of Realistic Edge-Fog Cloud Ecosystems</title>
          <author initials="M." surname="Ficco" fullname="Massimo Ficco">
            <organization/>
          </author>
          <author initials="C." surname="Esposito" fullname="Christian Esposito">
            <organization/>
          </author>
          <author initials="Y." surname="Xiang" fullname="Yang Xiang">
            <organization/>
          </author>
          <author initials="F." surname="Palmieri" fullname="Francesco Palmieri">
            <organization/>
          </author>
          <date year="2017" month="November"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Communications Magazine" value="vol. Magazine, vol. 55, no. 11, pp. 98-104"/> 98-104</refcontent>
        <seriesInfo name="DOI" value="10.1109/mcom.2017.1700328"/>
      </reference>

      <reference anchor="LFEDGE-EVE" target="https://www.lfedge.org/projects/eve">
        <front>
          <title>Project Edge Virtualization Engine (EVE)</title>
          <author initials="" surname="Linux Foundation">
            <organization/>
          <author>
            <organization>Linux Foundation</organization>
          </author>
          <date year="2020"/>
        </front>
        <refcontent>Portal, retrieved
        <refcontent>Portal</refcontent>
	<annotation>Retrieved on 2022-05-24</refcontent> 2022-05-24.</annotation>
      </reference>

      <reference anchor="Yousefpour">
        <front>
          <title>All one needs to know about fog computing and related edge computing paradigms: A complete survey</title>
          <author initials="A." surname="Yousefpour" fullname="Ashkan Yousefpour">
            <organization/>
          </author>
          <author initials="C." surname="Fung" fullname="Caleb Fung">
            <organization/>
          </author>
          <author initials="T." surname="Nguyen" fullname="Tam Nguyen">
            <organization/>
          </author>
          <author initials="K." surname="Kadiyala" fullname="Krishna Kadiyala">
            <organization/>
          </author>
          <author initials="F." surname="Jalali" fullname="Fatemeh Jalali">
            <organization/>
          </author>
          <author initials="A." surname="Niakanlahiji" fullname="Amirreza Niakanlahiji">
            <organization/>
          </author>
          <author initials="J." surname="Kong" fullname="Jian Kong">
            <organization/>
          </author>
          <author initials="J." surname="Jue" fullname="Jason P. Jue">
            <organization/>
          </author>
          <date year="2019" month="September"/>
        </front>
        <seriesInfo name="Journal
        <refcontent>Journal of Systems Architecture" value="vol. Architecture, vol. 98, pp. 289-330"/> 289-330</refcontent>
        <seriesInfo name="DOI" value="10.1016/j.sysarc.2019.02.009"/>
      </reference>
      <reference anchor="I-D.bernardos-sfc-fog-ran">
        <front>
          <title>Service Function Chaining Use Cases in Fog RAN</title>
          <author fullname="Carlos J. Bernardos" initials="C. J." surname="Bernardos">
            <organization>UC3M</organization>
          </author>
          <author fullname="Alain Mourad" initials="A." surname="Mourad">
            <organization>InterDigital</organization>
          </author>
          <date day="22" month="October" year="2021"/>
          <abstract>
            <t>   Fog Radio Access Networks (RAN) refers to the part of the RAN that is
   virtualized at the very edge of the network, even at the end-user
   device.  Fog RAN support is considered critical for the 5G mobile
   network architectures currently being developed in various research,
   standardization and industry forums.  Since fog RAN builds on top of
   virtualization and can involve several virtual functions running on
   different virtualized resources, Service function chaining (SFC)
   support for the fog RAN will be critical.  This document describes
   the overall fog RAN approach and also gives some use cases.  Finally
   it proposes some requirements to be considered in the development of
   the SFC architecture and related protocols.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-bernardos-sfc-fog-ran-10"/>
      </reference>

<!-- [I-D.bernardos-sfc-fog-ran] IESG state Expired -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.bernardos-sfc-fog-ran.xml"/>

      <reference anchor="Schafer">
        <front>
          <title>Tasklets: Overcoming Heterogeneity in Distributed Computing Systems</title>
          <author initials="D." surname="Schafer" surname="Schäfer" fullname="Dominik Schafer"> Schäfer">
            <organization/>
          </author>
          <author initials="J." surname="Edinger" fullname="Janick Edinger">
            <organization/>
          </author>
          <author initials="S." surname="VanSyckel" fullname="Sebastian VanSyckel">
            <organization/>
          </author>
          <author initials="J." surname="Paluska" fullname="Justin Mazzola Paluska">
            <organization/>
          </author>
          <author initials="C." surname="Becker" fullname="Christian Becker">
            <organization/>
          </author>
          <date year="2016" month="June"/>
        </front>
        <seriesInfo name="2016
        <refcontent>2016 IEEE 36th International Conference on Distributed Computing Systems Workshops" value="(ICDCSW)"/> Workshops (ICDCSW)</refcontent>
        <seriesInfo name="DOI" value="10.1109/icdcsw.2016.22"/>
      </reference>

      <reference anchor="Echeverria">
        <front>
          <title>Establishing Trusted Identities in Disconnected Edge Environments</title>
          <author initials="S." surname="Echeverria" fullname="Sebastian Echeverria"> surname="Echeverría" fullname="Sebastián Echeverría">
            <organization/>
          </author>
          <author initials="D." surname="Klinedinst" fullname="Dan Klinedinst">
            <organization/>
          </author>
          <author initials="K." surname="Williams" fullname="Keegan Williams">
            <organization/>
          </author>
          <author initials="G." surname="Lewis" fullname="Grace A. Lewis">
            <organization/>
          </author>
          <date year="2016" month="October"/>
        </front>
        <seriesInfo name="2016
        <refcontent>2016 IEEE/ACM Symposium on Edge Computing" value="(SEC)"/> Computing (SEC)</refcontent>
        <seriesInfo name="DOI" value="10.1109/sec.2016.27"/>
      </reference>

      <reference anchor="Harchol">
        <front>
          <title>CESSNA: Resilient Edge-Computing</title>
          <author initials="Y." surname="Harchol" fullname="Yotam Harchol">
            <organization/>
          </author>
          <author initials="A." surname="Mushtaq" fullname="Aisha Mushtaq">
            <organization/>
          </author>
          <author initials="J." surname="McCauley" fullname="James McCauley">
            <organization/>
          </author>
          <author initials="A." surname="Panda" fullname="Aurojit Panda">
            <organization/>
          </author>
          <author initials="S." surname="Shenker" fullname="Scott Shenker">
            <organization/>
          </author>
          <date year="2018" month="August"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 2018 Workshop on Mobile Edge" value="Communications"/> Edge Communications</refcontent>
        <seriesInfo name="DOI" value="10.1145/3229556.3229558"/>
      </reference>

      <reference anchor="Anglano">
        <front>
          <title>A game-theoretic approach to coalition formation in fog provider federations</title>
          <author initials="C." surname="Anglano" fullname="Cosimo Anglano">
            <organization/>
          </author>
          <author initials="M." surname="Canonico" fullname="Massimo Canonico">
            <organization/>
          </author>
          <author initials="P." surname="Castagno" fullname="Paolo Castagno">
            <organization/>
          </author>
          <author initials="M." surname="Guazzone" fullname="Marco Guazzone">
            <organization/>
          </author>
          <author initials="M." surname="Sereno" fullname="Matteo Sereno">
            <organization/>
          </author>
          <date year="2018" month="April"/>
        </front>
        <seriesInfo name="2018
        <refcontent>2018 Third International Conference on Fog and Mobile Edge Computing" value="(FMEC)"/> Computing (FMEC)</refcontent>
        <seriesInfo name="DOI" value="10.1109/fmec.2018.8364054"/>
      </reference>

      <reference anchor="Jeong">
        <front>
          <title>Towards a distributed computing framework for Fog</title>
          <author initials="T." surname="Jeong" fullname="Taeyeol Jeong">
            <organization/>
          </author>
          <author initials="J." surname="Chung" fullname="Jaeyoon Chung">
            <organization/>
          </author>
          <author initials="J." surname="Hong" fullname="James Won-Ki Hong">
            <organization/>
          </author>
          <author initials="S." surname="Ha" fullname="Sangtae Ha">
            <organization/>
          </author>
          <date year="2017" month="October"/>
        </front>
        <seriesInfo name="2017
        <refcontent>2017 IEEE Fog World Congress" value="(FWC)"/> Congress (FWC)</refcontent>
        <seriesInfo name="DOI" value="10.1109/fwc.2017.8368528"/>
      </reference>

      <reference anchor="Fan">
        <front>
          <title>Cost Aware cloudlet Placement for big data processing at the edge</title>
          <author initials="Q." surname="Fan" fullname="Qiang Fan">
            <organization/>
          </author>
          <author initials="N." surname="Ansari" fullname="Nirwan Ansari">
            <organization/>
          </author>
          <date year="2017" month="May"/>
        </front>
        <seriesInfo name="2017
        <refcontent>2017 IEEE International Conference on Communications" value="(ICC)"/> Communications (ICC)</refcontent>
        <seriesInfo name="DOI" value="10.1109/icc.2017.7996722"/>
      </reference>

      <reference anchor="Yangui">
        <front>
          <title>A platform as-a-service for hybrid cloud/fog environments</title>
          <author initials="S." surname="Yangui" fullname="Sami Yangui">
            <organization/>
          </author>
          <author initials="P." surname="Ravindran" fullname="Pradeep Ravindran">
            <organization/>
          </author>
          <author initials="O." surname="Bibani" fullname="Ons Bibani">
            <organization/>
          </author>
          <author initials="R." surname="Glitho" fullname="Roch H. Glitho">
            <organization/>
          </author>
          <author initials="N." surname="Ben Hadj-Alouane" fullname="Nejib Ben Hadj-Alouane">
            <organization/>
          </author>
          <author initials="M." surname="Morrow" fullname="Monique J. Morrow">
            <organization/>
          </author>
          <author initials="P." surname="Polakos" fullname="Paul A. Polakos">
            <organization/>
          </author>
          <date year="2016" month="June"/>
        </front>
        <seriesInfo name="2016
        <refcontent>2016 IEEE International Symposium on Local and Metropolitan Area Networks" value="(LANMAN)"/> Networks (LANMAN)</refcontent>
        <seriesInfo name="DOI" value="10.1109/lanman.2016.7548853"/>
      </reference>

      <reference anchor="Li">
        <front>
          <title>MobiQoR: Pushing the Envelope of Mobile Edge Computing Via Quality-of-Result Optimization</title>
          <author initials="Y." surname="Li" fullname="Yongbo Li">
            <organization/>
          </author>
          <author initials="Y." surname="Chen" fullname="Yurong Chen">
            <organization/>
          </author>
          <author initials="T." surname="Lan" fullname="Tian Lan">
            <organization/>
          </author>
          <author initials="G." surname="Venkataramani" fullname="Guru Venkataramani">
            <organization/>
          </author>
          <date year="2017" month="June"/>
        </front>
        <seriesInfo name="2017
        <refcontent>2017 IEEE 37th International Conference on Distributed Computing Systems" value="(ICDCS)"/> Systems (ICDCS)</refcontent>
        <seriesInfo name="DOI" value="10.1109/icdcs.2017.54"/>
      </reference>

      <reference anchor="Liu">
        <front>
          <title>Cache Placement in Fog-RANs: From Centralized to Distributed Algorithms</title>
          <author initials="J." surname="Liu" fullname="Juan Liu">
            <organization/>
          </author>
          <author initials="B." surname="Bai" fullname="Bo Bai">
            <organization/>
          </author>
          <author initials="J." surname="Zhang" fullname="Jun Zhang">
            <organization/>
          </author>
          <author initials="K." surname="Letaief" fullname="Khaled B. Letaief">
            <organization/>
          </author>
          <date year="2017" month="November"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Transactions on Wireless Communications" value="vol. Communications, vol. 16, no. 11, pp. 7039-7051"/> 7039-7051</refcontent>
        <seriesInfo name="DOI" value="10.1109/twc.2017.2737015"/>
      </reference>

      <reference anchor="Zhang">
        <front>
          <title>Firework: Big Data Sharing and Processing in Collaborative Edge Environment</title>
          <author initials="Q." surname="Zhang" fullname="Quan Zhang">
            <organization/>
          </author>
          <author initials="X." surname="Zhang" fullname="Xiaohong Zhang">
            <organization/>
          </author>
          <author initials="Q." surname="Zhang" fullname="Qingyang Zhang">
            <organization/>
          </author>
          <author initials="W." surname="Shi" fullname="Weisong Shi">
            <organization/>
          </author>
          <author initials="H." surname="Zhong" fullname="Hong Zhong">
            <organization/>
          </author>
          <date year="2016" month="October"/>
        </front>
        <seriesInfo name="2016
        <refcontent>2016 Fourth IEEE Workshop on Hot Topics in Web Systems and Technologies" value="(HotWeb)"/> Technologies (HotWeb)</refcontent>
        <seriesInfo name="DOI" value="10.1109/hotweb.2016.12"/>
      </reference>

      <reference anchor="Basudan">
        <front>
          <title>A Privacy-Preserving Vehicular Crowdsensing-Based Road Surface Condition Monitoring System Using Fog Computing</title>
          <author initials="S." surname="Basudan" fullname="Sultan Basudan">
            <organization/>
          </author>
          <author initials="X." surname="Lin" fullname="Xiaodong Lin">
            <organization/>
          </author>
          <author initials="K." surname="Sankaranarayanan" fullname="Karthik Sankaranarayanan">
            <organization/>
          </author>
          <date year="2017" month="June"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Internet of Things Journal" value="vol. Journal, vol. 4, no. 3, pp. 772-782"/> 772-782</refcontent>
        <seriesInfo name="DOI" value="10.1109/jiot.2017.2666783"/>
      </reference>

      <reference anchor="Renart">
        <front>
          <title>Data-Driven Stream Processing at the Edge</title>
          <author initials="E." surname="Renart" fullname="Eduard Gibert Renart">
            <organization/>
          </author>
          <author initials="J." surname="Diaz-Montes" fullname="Javier Diaz-Montes">
            <organization/>
          </author>
          <author initials="M." surname="Parashar" fullname="Manish Parashar">
            <organization/>
          </author>
          <date year="2017" month="May"/>
        </front>
        <seriesInfo name="2017
        <refcontent>2017 IEEE 1st International Conference on Fog and Edge Computing" value="(ICFEC)"/> Computing (ICFEC)</refcontent>
        <seriesInfo name="DOI" value="10.1109/icfec.2017.18"/>
      </reference>

      <reference anchor="Zhang2">
        <front>
          <title>Data Security and Privacy-Preserving in Edge Computing Paradigm: Survey and Open Issues</title>
          <author initials="J." surname="Zhang" fullname="Jiale Zhang">
            <organization/>
          </author>
          <author initials="B." surname="Chen" fullname="Bing Chen">
            <organization/>
          </author>
          <author initials="Y." surname="Zhao" fullname="Yanchao Zhao">
            <organization/>
          </author>
          <author initials="X." surname="Cheng" fullname="Xiang Cheng">
            <organization/>
          </author>
          <author initials="F." surname="Hu" fullname="Feng Hu">
            <organization/>
          </author>
          <date year="2018"/> year="2018" month="March"/>
        </front>
        <seriesInfo name="IEEE Access" value="vol.
        <refcontent>IEEE Access, vol. 6, pp. 18209-18237"/> 18209-18237</refcontent>
        <seriesInfo name="DOI" value="10.1109/access.2018.2820162"/>
      </reference>

      <reference anchor="Yates">
        <front>
          <title>The Age of Information: Real-Time Status Updating by Multiple Sources</title>
          <author initials="R." surname="Yates" fullname="Roy D. Yates">
            <organization/>
          </author>
          <author initials="S." surname="Kaul" fullname="Sanjit K. Kaul">
            <organization/>
          </author>
          <date year="2019" month="March"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Transactions on Information Theory" value="vol. Theory, vol. 65, no. 3, pp. 1807-1827"/> 1807-1827</refcontent>
        <seriesInfo name="DOI" value="10.1109/tit.2018.2871079"/>
      </reference>

      <reference anchor="Khan">
        <front>
          <title>Edge-Computing-Enabled Smart Cities: A Comprehensive Survey</title>
          <author initials="L." surname="Khan" fullname="Latif U. Khan">
            <organization/>
          </author>
          <author initials="I." surname="Yaqoob" fullname="Ibrar Yaqoob">
            <organization/>
          </author>
          <author initials="N." surname="Tran" fullname="Nguyen H. Tran">
            <organization/>
          </author>
          <author initials="S." surname="Kazmi" fullname="S. M. Ahsan Kazmi">
            <organization/>
          </author>
          <author initials="T." surname="Dang" fullname="Tri Nguyen Dang">
            <organization/>
          </author>
          <author initials="C." surname="Hong" fullname="Choong Seon Hong">
            <organization/>
          </author>
          <date year="2020" month="October"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Internet of Things Journal" value="vol. Journal, vol. 7, no. 10, pp. 10200-10232"/> 10200-10232</refcontent>
        <seriesInfo name="DOI" value="10.1109/jiot.2020.2987070"/>
      </reference>
      <reference anchor="RFC7390">
        <front>
          <title>Group Communication for the Constrained Application Protocol (CoAP)</title>
          <author fullname="A. Rahman" initials="A." role="editor" surname="Rahman"/>
          <author fullname="E. Dijk" initials="E." role="editor" surname="Dijk"/>
          <date month="October" year="2014"/>
          <abstract>
            <t>The Constrained Application Protocol (CoAP) is a specialized web transfer protocol for constrained devices and constrained networks. It is anticipated that constrained devices will often naturally operate in groups (e.g., in a building automation scenario, all lights in a given room may need to be switched on/off as a group). This specification defines how CoAP should be used in a group communication context. An approach for using CoAP on top of IP multicast is detailed based on existing CoAP functionality as well as new features introduced in this specification. Also, various use cases and corresponding protocol flows are provided to illustrate important concepts. Finally, guidance is provided for deployment in various network topologies.</t>
          </abstract>
        </front>
        <seriesInfo name="RFC" value="7390"/>
        <seriesInfo name="DOI" value="10.17487/RFC7390"/>
      </reference>
      <reference anchor="I-D.ietf-core-groupcomm-bis">
        <front>
          <title>Group Communication for the Constrained Application Protocol (CoAP)</title>
          <author fullname="Esko Dijk" initials="E." surname="Dijk">
            <organization>IoTconsultancy.nl</organization>
          </author>
          <author fullname="Chonggang Wang" initials="C." surname="Wang">
            <organization>InterDigital</organization>
          </author>
          <author fullname="Marco Tiloca" initials="M." surname="Tiloca">
            <organization>RISE AB</organization>
          </author>
          <date day="10" month="July" year="2023"/>
          <abstract>
            <t>   This document specifies the use of the Constrained Application
   Protocol (CoAP) for group communication, including the use of UDP/IP
   multicast as the default underlying data transport.  Both unsecured
   and secured CoAP group communication are specified.  Security is
   achieved by use of the Group Object Security for Constrained RESTful
   Environments (Group OSCORE) protocol.  The target application area of
   this specification is any group communication use cases that involve
   resource-constrained devices or networks that support CoAP.  This
   document replaces RFC 7390, while it updates RFC 7252 and RFC 7641.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-ietf-core-groupcomm-bis-09"/>
      </reference>

<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7390.xml"/>

<!-- [I-D.ietf-core-groupcomm-bis] IESG state I-D Exists -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.ietf-core-groupcomm-bis.xml"/>

      <reference anchor="Murshed">
        <front>
          <title>Machine Learning at the Network Edge: A Survey</title>
          <author initials="M." surname="Murshed" fullname="M. G. Sarwar Murshed">
            <organization/>
          </author>
          <author initials="C." surname="Murphy" fullname="Christopher Murphy">
            <organization/>
          </author>
          <author initials="D." surname="Hou" fullname="Daqing Hou">
            <organization/>
          </author>
          <author initials="N." surname="Khan" fullname="Nazar Khan">
            <organization/>
          </author>
          <author initials="G." surname="Ananthanarayanan" fullname="Ganesh Ananthanarayanan">
            <organization/>
          </author>
          <author initials="F." surname="Hussain" fullname="Faraz Hussain">
            <organization/>
          </author>
          <date year="2022" month="November"/> year="2021" month="October"/>
        </front>
        <seriesInfo name="ACM
        <refcontent>ACM Computing Surveys" value="vol. Surveys, vol. 54, no. 8, pp. 1-37"/> 1-37</refcontent>
        <seriesInfo name="DOI" value="10.1145/3469029"/>
      </reference>
      <reference anchor="I-D.sarathchandra-coin-appcentres">
        <front>
          <title>In-Network Computing for App-Centric Micro-Services</title>
          <author fullname="Dirk Trossen" initials="D." surname="Trossen">
            <organization>Huawei</organization>
          </author>
          <author fullname="Chathura Sarathchandra" initials="C." surname="Sarathchandra">
            <organization>InterDigital Inc.</organization>
          </author>
          <author fullname="Michael Boniface" initials="M." surname="Boniface">
            <organization>University of Southampton</organization>
          </author>
          <date day="26" month="January" year="2021"/>
          <abstract>
            <t>   The application-centric deployment of 'Internet' services has
   increased over the past ten years with many millions of applications
   providing user-centric services, executed on increasingly more
   powerful smartphones that are supported by Internet-based cloud
   services in distributed data centres, the latter mainly provided by
   large scale players such as Google, Amazon and alike. This draft
   outlines a vision for evolving those data centres towards executing
   app-centric micro-services; we dub this evolved data centre as an
   AppCentre. Complemented with the proliferation of such AppCentres at
   the edge of the network, they will allow for such micro-services to
   be distributed across many places of execution, including mobile
   terminals themselves, while specific micro-service chains equal
   today's applications in existing smartphones.

   We outline the key enabling technologies that needs to be provided
   for such evolution to be realized, including references to ongoing
   standardization efforts in key areas.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-sarathchandra-coin-appcentres-04"/>
      </reference>
      <reference anchor="I-D.defoy-t2trg-iot-edge-computing-background">
        <front>
          <title>IoT Edge Computing: Initiatives, Projects and Products</title>
          <author fullname="Xavier de Foy" initials="X." surname="de Foy">
            <organization>InterDigital Communications</organization>
          </author>
          <author fullname="Jungha Hong" initials="J." surname="Hong">
            <organization>ETRI</organization>
          </author>
          <author fullname="Yong-Geun Hong" initials="Y." surname="Hong">
            <organization>ETRI</organization>
          </author>
          <author fullname="Matthias Kovatsch" initials="M." surname="Kovatsch">
            <organization>Huawei Technologies Duesseldorf GmbH</organization>
          </author>
          <author fullname="Eve Schooler" initials="E." surname="Schooler">
            <organization>Intel</organization>
          </author>
          <author fullname="Dirk Kutscher" initials="D." surname="Kutscher">
            <organization>University of Applied Sciences Emden/Leer</organization>
          </author>
          <date day="25" month="May" year="2020"/>
          <abstract>
            <t>   Many IoT applications have requirements that cannot be met by
   the traditional Cloud.  As a result, the IoT is driving the Internet
   toward Edge computing.  This draft reviews initiatives, projects and
   products related to IoT Edge Computing.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-defoy-t2trg-iot-edge-computing-background-00"/>
      </reference>

<!-- [I-D.sarathchandra-coin-appcentres] IESG state Expired -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.sarathchandra-coin-appcentres.xml"/>

<!-- [I-D.defoy-t2trg-iot-edge-computing-background] IESG state	Expired -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.defoy-t2trg-iot-edge-computing-background.xml"/>

      <reference anchor="Senel">
        <front>
          <title>EdgeNet: A Multi-Tenant and Multi-Provider Edge Cloud</title>
          <author initials="B." surname="Senel" surname="Şenel" fullname="Berat Can Senel"> Şenel">
            <organization/>
          </author>
          <author initials="M." surname="Mouchet" fullname="Maxime Mouchet">
            <organization/>
          </author>
          <author initials="J." surname="Cappos" fullname="Justin Cappos">
            <organization/>
          </author>
          <author initials="O." surname="Fourmaux" fullname="Olivier Fourmaux">
            <organization/>
          </author>
          <author initials="T." surname="Friedman" fullname="Timur Friedman">
            <organization/>
          </author>
          <author initials="R." surname="McGeer" fullname="Rick McGeer">
            <organization/>
          </author>
          <date year="2021" month="April"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 4th International Workshop on Edge Systems, Analytics and" value="Networking"/> and Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3434770.3459737"/>
      </reference>

      <reference anchor="Stanciu">
        <front>
          <title>Privacy-Preserving Crowd-Monitoring Using Bloom Filters and Homomorphic Encryption</title>
          <author initials="V." surname="Stanciu" fullname="Valeriu-Daniel Stanciu">
            <organization/>
          </author>
          <author initials="M." surname="Steen" fullname="Maarten van Steen">
            <organization/>
          </author>
          <author initials="C." surname="Dobre" fullname="Ciprian Dobre">
            <organization/>
          </author>
          <author initials="A." surname="Peter" fullname="Andreas Peter">
            <organization/>
          </author>
          <date year="2021" month="April"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 4th International Workshop on Edge Systems, Analytics and" value="Networking"/> and Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3434770.3459735"/>
      </reference>

      <reference anchor="Jeffery">
        <front>
          <title>Rearchitecting Kubernetes for the Edge</title>
          <author initials="A." surname="Jeffery" fullname="Andrew Jeffery">
            <organization/>
          </author>
          <author initials="H." surname="Howard" fullname="Heidi Howard">
            <organization/>
          </author>
          <author initials="R." surname="Mortier" fullname="Richard Mortier">
            <organization/>
          </author>
          <date year="2021" month="April"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 4th International Workshop on Edge Systems, Analytics and" value="Networking"/> and Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3434770.3459730"/>
      </reference>

      <reference anchor="Nieke">
        <front>
          <title>Edgedancer: Secure Mobile WebAssembly Services on the Edge</title>
          <author initials="M." surname="Nieke" fullname="Manuel Nieke">
            <organization/>
          </author>
          <author initials="L." surname="Almstedt" fullname="Lennart Almstedt">
            <organization/>
          </author>
          <author initials="R." surname="Kapitza" fullname="Rudiger Kapitza">
            <organization/>
          </author>
          <date year="2021" month="April"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 4th International Workshop on Edge Systems, Analytics and" value="Networking"/> and Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3434770.3459731"/>
      </reference>

      <reference anchor="Cao">
        <front>
          <title>eCaaS: A Management Framework of Edge Container as a Service for Business Workload</title>
          <author initials="L." surname="Cao" fullname="Lianjie Cao">
            <organization/>
          </author>
          <author initials="A." surname="Merican" fullname="Anu Merican">
            <organization/>
          </author>
          <author initials="D." surname="Tootaghaj" fullname="Diman Zad Tootaghaj">
            <organization/>
          </author>
          <author initials="F." surname="Ahmed" fullname="Faraz Ahmed">
            <organization/>
          </author>
          <author initials="P." surname="Sharma" fullname="Puneet Sharma">
            <organization/>
          </author>
          <author initials="V." surname="Saxena" fullname="Vinay Saxena">
            <organization/>
          </author>
          <date year="2021" month="April"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 4th International Workshop on Edge Systems, Analytics and" value="Networking"/> and Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3434770.3459741"/>
      </reference>

      <reference anchor="Larrea">
        <front>
          <title>The serverkernel operating system</title>
          <author initials="J." surname="Larrea" fullname="Jon Larrea">
            <organization/>
          </author>
          <author initials="A." surname="Barbalace" fullname="Antonio Barbalace">
            <organization/>
          </author>
          <date year="2020" month="April"/> month="May"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the Third ACM International Workshop on Edge Systems, Analytics and" value="Networking"/> and Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3378679.3394537"/>
      </reference>

      <reference anchor="Mortazavi" target="https://www.usenix.org/conference/hotedge18/presentation/mortazavi">
        <front>
          <title>Toward Session Consistency for the Edge</title>
          <author initials="S." surname="Hossein surname="Mortazavi" fullname="Seyed Hossein Mortazavi">
            <organization/>
          </author>
          <author initials="B." surname="Balasubramanian"> surname="Balasubramanian" fullname="Bharath Balasubramanian">
            <organization/>
          </author>
          <author initials="E." surname="de Lara" fullname="Eyal de Lara">
            <organization/>
          </author>
          <author initials="S. P." surname="Narayanan"> initials="S." surname="Narayanan" fullname="Shankaranarayanan Puzhavakath Narayanan">
            <organization/>
          </author>
          <date year="2018"/>
        </front>
        <refcontent>USENIX,
        <refcontent>USENIX Workshop on Hot Topics in Edge Computing (HotEdge 18)</refcontent>
      </reference>

      <reference anchor="oneM2M-TR0001" target="https://member.onem2m.org/Application/documentapp/downloadLatestRevision/default.aspx?docID=28153">
        <front>
          <title>TR 0001, Use
          <title>Use Cases Collection</title>
          <author initials="C." surname="Mladin"> surname="Mladin" fullname="Catalina Mladin">
            <organization/>
          </author>
          <date year="2018" month="October"/>
        </front>
        <refcontent>oneM2M</refcontent>
	<seriesInfo name="TR" value="0001"/>
        <refcontent>oneM2M, v4.2.0</refcontent>
      </reference>

      <reference anchor="oneM2M-TR0018" target="https://member.onem2m.org/Application/documentapp/downloadLatestRevision/default.aspx?docID=29334">
        <front>
          <title>TR 0018, Industrial
          <title>Industrial Domain Enablement</title>
          <author initials="C." surname="Lu"> surname="Lu" fullname="Chengsui Lu">
            <organization/>
          </author>
          <author initials="M." surname="Jiang"> surname="Jiang" fullname="Miao Jiang">
            <organization/>
          </author>
          <date year="2019" month="February"/>
        </front>
        <refcontent>oneM2M</refcontent>
	<seriesInfo name="TR" value="0018"/>
        <refcontent>oneM2M, v2.5.2</refcontent>
      </reference>

      <reference anchor="oneM2M-TR0026" target="https://member.onem2m.org/Application/documentapp/downloadLatestRevision/default.aspx?docID=31410">
        <front>
          <title>TR 0026, Vehicular
          <title>Vehicular Domain Enablement</title>
          <author initials="K." surname="Yamamoto"> surname="Yamamoto" fullname="Kenichi Yamamoto">
            <organization/>
          </author>
          <author initials="C." surname="Mladin"> surname="Mladin" fullname="Catalina Mladin">
            <organization/>
          </author>
          <author initials="V." surname="Kueh"> surname="Kueh" fullname="Victor Kueh">
            <organization/>
          </author>
          <date year="2020" month="January"/>
        </front>
	<seriesInfo name="TR" value="0026"/>
        <refcontent>oneM2M</refcontent>
      </reference>

      <reference anchor="oneM2M-TR0052" target="https://member.onem2m.org/Application/documentapp/downloadLatestRevision/default.aspx?docID=32633">
        <front>
          <title>TR 0052, Study
          <title>Study on Edge and Fog Computing in oneM2M systems</title>
          <author initials="K." surname="Yamamoto"> surname="Yamamoto" fullname="Kenichi Yamamoto">
            <organization/>
          </author>
          <author initials="C." surname="Mladin"> surname="Mladin" fullname="Catalina Mladin">
            <organization/>
          </author>
          <date year="2020" month="September"/>
        </front>
	<seriesInfo name="TR" value="0052"/>
        <refcontent>oneM2M</refcontent>
      </reference>

      <reference anchor="oneM2M-TS0002" target="https://member.onem2m.org/Application/documentapp/downloadLatestRevision/default.aspx?docID=29274">
        <front>
          <title>TS 0002, Requirements</title>
          <author initials="S." surname="He"> surname="He" fullname="Shane He">
            <organization/>
          </author>
          <date year="2019" month="February"/>
        </front>
	<seriesInfo name="TS" value="0002"/>
        <refcontent>oneM2M</refcontent>
      </reference>

      <reference anchor="Chen">
        <front>
          <title>Edge Computing in IoT-Based Manufacturing</title>
          <author initials="B." surname="Chen" fullname="Baotong Chen">
            <organization/>
          </author>
          <author initials="J." surname="Wan" fullname="Jiafu Wan">
            <organization/>
          </author>
          <author initials="A." surname="Celesti" fullname="Antonio Celesti">
            <organization/>
          </author>
          <author initials="D." surname="Li" fullname="Di Li">
            <organization/>
          </author>
          <author initials="H." surname="Abbas" fullname="Haider Abbas">
            <organization/>
          </author>
          <author initials="Q." surname="Zhang" fullname="Qin Zhang">
            <organization/>
          </author>
          <date year="2018" month="September"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Communications Magazine" value="vol. Magazine, vol. 56, no. 9, pp. 103-109"/> 103-109</refcontent>
        <seriesInfo name="DOI" value="10.1109/mcom.2018.1701231"/>
      </reference>

      <reference anchor="Jones">
        <front>
          <title>Characterising the Digital Twin: A systematic literature review</title>
          <author initials="D." surname="Jones" fullname="David Jones">
            <organization/>
          </author>
          <author initials="C." surname="Snider" fullname="Chris Snider">
            <organization/>
          </author>
          <author initials="A." surname="Nassehi" fullname="Aydin Nassehi">
            <organization/>
          </author>
          <author initials="J." surname="Yon" fullname="Jason Yon">
            <organization/>
          </author>
          <author initials="B." surname="Hicks" fullname="Ben Hicks">
            <organization/>
          </author>
          <date year="2020" month="May"/>
        </front>
        <seriesInfo name="CIRP
        <refcontent>CIRP Journal of Manufacturing Science and Technology" value="vol. Technology, vol. 29, pp. 36-52"/> 36-52</refcontent>
        <seriesInfo name="DOI" value="10.1016/j.cirpj.2020.02.002"/>
      </reference>
      <reference anchor="RFC7252">
        <front>
          <title>The Constrained Application Protocol (CoAP)</title>
          <author fullname="Z. Shelby" initials="Z." surname="Shelby"/>
          <author fullname="K. Hartke" initials="K." surname="Hartke"/>
          <author fullname="C. Bormann" initials="C." surname="Bormann"/>
          <date month="June" year="2014"/>
          <abstract>
            <t>The Constrained Application Protocol (CoAP) is a specialized web transfer protocol for use with constrained nodes and constrained (e.g., low-power, lossy) networks. The nodes often have 8-bit microcontrollers with small amounts of ROM and RAM, while constrained networks such as IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs) often have high packet error rates and a typical throughput of 10s of kbit/s. The protocol is designed for machine- to-machine (M2M) applications such as smart energy and building automation.</t>
            <t>CoAP provides a request/response interaction model between application endpoints, supports built-in discovery of services and resources, and includes key concepts of the Web such as URIs and Internet media types. CoAP is designed to easily interface with HTTP for integration with the Web while meeting specialized requirements such as multicast support, very low overhead, and simplicity for constrained environments.</t>
          </abstract>
        </front>
        <seriesInfo name="RFC" value="7252"/>
        <seriesInfo name="DOI" value="10.17487/RFC7252"/>
      </reference>

<xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7252.xml"/>

      <reference anchor="Cloudlets">
        <front>
          <title>The Case for VM-Based Cloudlets in Mobile Computing</title>
          <author initials="M." surname="Satyanarayanan" fullname="M. fullname="Mahadev Satyanarayanan">
            <organization/>
          </author>
          <author initials="P." surname="Bahl" fullname="P. fullname="Paramvir Bahl">
            <organization/>
          </author>
          <author initials="R." surname="Caceres" fullname="R. fullname="Ramon Caceres">
            <organization/>
          </author>
          <author initials="N." surname="Davies" fullname="N. fullname="Nigel Davies">
            <organization/>
          </author>
          <date year="2009" month="October"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Pervasive Computing" value="vol. Computing, vol. 8, no. 4, pp. 14-23"/> 14-23</refcontent>
        <seriesInfo name="DOI" value="10.1109/mprv.2009.82"/>
      </reference>

      <reference anchor="ETSI_MEC_33" target="https://www.etsi.org/deliver/etsi_gs/MEC/001_099/033/03.01.01_60/gs_MEC033v030101p.pdf">
        <front>
          <title>Multi-access Edge Computing (MEC); IoT API</title>
          <author>
            <organization>ETSI</organization>
          </author>
          <date year="2022"/> year="2022" month="December"/>
        </front>
        <refcontent>ETSI GS MEC 033</refcontent>
	<seriesInfo name="ETSI GS" value="MEC 033"/>
        <refcontent>V3.1.1</refcontent>
      </reference>

      <reference anchor="Madni">
        <front>
          <title>Leveraging digital twin technology Digital Twin Technology in model-based systems engineering</title> Model-Based Systems Engineering</title>
          <author initials="A. M." initials="A." surname="Madni" fullname="Azad M. Madni">
            <organization/>
          </author>
          <author initials="C." surname="Madni" fullname="Carla C. Madni">
            <organization/>
          </author>
          <author initials="S. D." initials="S." surname="Lucero" fullname="Scott D. Lucero">
            <organization/>
          </author>
          <date year="2019"/> year="2019" month="January"/>
        </front>
        <seriesInfo name="Systems 7, no. 1" value="7"/>
        <refcontent>Systems 7(1):7</refcontent>
        <seriesInfo name="DOI" value="10.3390/systems7010007"/>
      </reference>
      <reference anchor="I-D.irtf-nmrg-network-digital-twin-arch">
        <front>
          <title>Digital Twin Network: Concepts and Reference Architecture</title>
          <author fullname="Cheng Zhou" initials="C." surname="Zhou">
            <organization>China Mobile</organization>
          </author>
          <author fullname="Hongwei Yang" initials="H." surname="Yang">
            <organization>China Mobile</organization>
          </author>
          <author fullname="Xiaodong Duan" initials="X." surname="Duan">
            <organization>China Mobile</organization>
          </author>
          <author fullname="Diego Lopez" initials="D." surname="Lopez">
            <organization>Telefonica I+D</organization>
          </author>
          <author fullname="Antonio Pastor" initials="A." surname="Pastor">
            <organization>Telefonica I+D</organization>
          </author>
          <author fullname="Qin Wu" initials="Q." surname="Wu">
            <organization>Huawei</organization>
          </author>
          <author fullname="Mohamed Boucadair" initials="M." surname="Boucadair">
            <organization>Orange</organization>
          </author>
          <author fullname="Christian Jacquenet" initials="C." surname="Jacquenet">
            <organization>Orange</organization>
          </author>
          <date day="27" month="April" year="2023"/>
          <abstract>
            <t>   Digital Twin technology has been seen as a rapid adoption technology
   in Industry 4.0.  The application of Digital Twin technology in the
   networking field is meant to develop various rich network
   applications and realize efficient and cost effective data driven
   network management and accelerate network innovation.

   This document presents an overview of the concepts of Digital Twin
   Network, provides the basic definitions and a reference architecture,
   lists a set of application scenarios, and discusses the benefits and
   key challenges of such technology.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-irtf-nmrg-network-digital-twin-arch-03"/>
      </reference>
      <reference anchor="I-D.hsingh-coinrg-reqs-p4comp">
        <front>
          <title>Requirements for P4 Program Splitting for Heterogeneous Network Nodes</title>
          <author fullname="Hemant Singh" initials="H." surname="Singh">
            <organization>MNK Labs and Consulting</organization>
          </author>
          <author fullname="Marie-Jose Montpetit" initials="M." surname="Montpetit">
            <organization>Concordia Univeristy</organization>
          </author>
          <date day="18" month="February" year="2021"/>
          <abstract>
            <t>   For distributed computing, the P4 research community has published a
   paper to show how to split a P4 program into sub-programs which run
   on heterogeneous network nodes in a network.  Examples of nodes are a
   network switch, a smartNIC, or a host machine.  The paper has
   developed artifacts to split program based on latency, data rate,
   cost, etc.  However, the paper does not mention any requirements.  To
   provide guidance, this document covers requirements for splitting P4
   programs for heterogeneous network nodes.

            </t>
          </abstract>
        </front>
        <seriesInfo name="Internet-Draft" value="draft-hsingh-coinrg-reqs-p4comp-03"/>
      </reference>

<!-- [I-D.irtf-nmrg-network-digital-twin-arch] IESG state I-D Exists -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.irtf-nmrg-network-digital-twin-arch.xml"/>

<!-- [I-D.hsingh-coinrg-reqs-p4comp] IESG state	Expired -->

<xi:include href="https://datatracker.ietf.org/doc/bibxml3/reference.I-D.hsingh-coinrg-reqs-p4comp.xml"/>

      <reference anchor="Farnbauer-Schmidt">
        <front>
          <title>Combining the Concepts of Semantic Data Integration and Edge Computing</title>
          <author initials="M." surname="Farnbauer-Schmidt" fullname="Matthias Farnbauer-Schmidt">
            <organization/>
          </author>
          <author initials="J." surname="Lindner" fullname="Julian Lindner">
            <organization/>
          </author>
          <author initials="C." surname="Kaffenberger" fullname="Christopher Kaffenberger">
            <organization/>
          </author>
          <author initials="J." surname="Albrecht" fullname="Jens Albrecht">
            <organization/>
          </author>
          <date year="2019"/> year="2019" month="September"/>
        </front>
        <seriesInfo name="INFORMATIK 2019" value="50
        <refcontent>INFORMATIK 2019: 50 Jahre Gesellschaft fur für Informatik - – Informatik fur Gesellschaft, für Gesellschaf, pp. 139-152"/> 139-152</refcontent>
        <seriesInfo name="DOI" value="10.18420/inf2019_19"/>
      </reference>

      <reference anchor="Brecko">
        <front>
          <title>Federated Learning for Edge Computing: A Survey</title>
          <author initials="A." surname="Brecko" fullname="Alexander Brecko">
            <organization/>
          </author>
          <author initials="E." surname="Kajati" surname="Kajáti" fullname="Erik Kajati"> Kajáti">
            <organization/>
          </author>
          <author initials="J." surname="Koziorek" fullname="Jiri Koziorek">
            <organization/>
          </author>
          <author initials="I." surname="Zolotova" surname="Zolotová" fullname="Iveta Zolotova"> Zolotová">
            <organization/>
          </author>
          <date year="2022"/> year="2022" month="September"/>
        </front>
        <seriesInfo name="Applied
        <refcontent>Applied Sciences 12, no. 18" value="9124"/> 12(18):9124</refcontent>
        <seriesInfo name="DOI" value="10.3390/app12189124"/>
      </reference>

      <reference anchor="Grewe">
        <front>
          <title>Information-Centric Mobile Edge Computing for Connected Vehicle Environments: Challenges and Research Directions</title>
          <author initials="D." surname="Grewe" fullname="Dennis Grewe">
            <organization/>
          </author>
          <author initials="M." surname="Wagner" fullname="Marco Wagner">
            <organization/>
          </author>
          <author initials="M." surname="Arumaithurai" fullname="Mayutan Arumaithurai">
            <organization/>
          </author>
          <author initials="I." surname="Psaras" fullname="Ioannis Psaras">
            <organization/>
          </author>
          <author initials="D." surname="Kutscher" fullname="Dirk Kutscher">
            <organization/>
          </author>
          <date year="2017"/> year="2017" month="August"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the Workshop on Mobile Edge Communications" value="pp. 7-12"/> Communications, pp. 7-12</refcontent>
        <seriesInfo name="DOI" value="10.1145/3098208.3098210"/>
      </reference>

      <reference anchor="Ali">
        <front>
          <title>Enabling a Blockchain-Based IoT Edge</title>
          <author initials="M. S." initials="M." surname="Ali" fullname="Muhammad Salek Ali">
            <organization/>
          </author>
          <author initials="M." surname="Vecchio" fullname="Massimo Vecchio">
            <organization/>
          </author>
          <author initials="F." surname="Antonelli" fullname="Fabio Antonelli">
            <organization/>
          </author>
          <date year="2018"/> year="2018" month="December"/>
        </front>
        <seriesInfo name="IEEE
        <refcontent>IEEE Internet of Things Magazine" value="pp. 24-29"/> Magazine, vol. 1, no.2, pp. 24-29</refcontent>
        <seriesInfo name="DOI" value="10.1109/IOTM.2019.1800024"/>
      </reference>

      <reference anchor="chipmunk"> anchor="Chipmunk">
        <front>
          <title>Chipmunk: Distributed Object Storage for NDN</title>
          <author fullname="Yong Yoon Shin" initials="Y." surname="Shin">
            <organization>ETRI, GurumNetworks, Republic of Korea</organization>
          </author>
          <author fullname="Sae Hyong Park" initials="S." surname="Park">
            <organization>ETRI, GurumNetworks, Republic of Korea</organization>
          </author>
          <author fullname="Namseok Ko" initials="N." surname="Ko">
            <organization>ETRI, GurumNetworks, Republic of Korea</organization>
          </author>
          <author fullname="Arm Jeong" initials="A." surname="Jeong">
            <organization>ETRI, GurumNetworks, Republic of Korea</organization>
          </author>
          <date month="September" year="2020"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 7th ACM Conference on Information-Centric" value="Networking"/> Information-Centric Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3405656.3420231"/>
        <refcontent>ACM</refcontent>
      </reference>

      <reference anchor="kua"> anchor="Kua">
        <front>
          <title>Kua: a distributed object store over named data networking</title>
          <author fullname="Varun Patil" initials="V." surname="Patil">
            <organization>UCLA</organization>
          </author>
          <author fullname="Hemil Desai" initials="H." surname="Desai">
            <organization>UCLA</organization>
          </author>
          <author fullname="Lixia Zhang" initials="L." surname="Zhang">
            <organization>UCLA</organization>
          </author>
          <date month="September" year="2022"/>
        </front>
        <seriesInfo name="Proceedings
        <refcontent>Proceedings of the 9th ACM Conference on Information-Centric" value="Networking"/> Information-Centric Networking</refcontent>
        <seriesInfo name="DOI" value="10.1145/3517212.3558083"/>
        <refcontent>ACM</refcontent>
      </reference>

      <reference anchor="mqtt5" anchor="MQTT5" target="https://docs.oasis-open.org/mqtt/mqtt/v5.0/mqtt-v5.0.html">
        <front>
          <title>MQTT Version 5.0</title>
	  <author initials="" surname="OASIS Message Queuing Telemetry Transport (MQTT) TC">
            <organization/>
          </author> initials="A." surname="Banks" fullname="Andrew Banks" role="editor"/>
	  <author initials="E." surname="Briggs" fullname="Ed Briggs" role="editor"/>
	  <author initials="K." surname="Borgendale" fullname="Ken Borgendale" role="editor"/>
	  <author initials="R." surname="Gupta" fullname="Rahul Gupta" role="editor"/>
          <date year="2019" month="March"/>
        </front>
        <refcontent>OASIS</refcontent>
        <refcontent>OASIS Standard</refcontent>
      </reference>
    </references>
  </back>
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    <section anchor="acknowledgements" numbered="false">
      <name>Acknowledgements</name>
      <t>The authors would like to thank <contact fullname="Joo-Sang Youn"/>, <contact fullname="Akbar Rahman"/>, <contact fullname="Michel Roy"/>, <contact fullname="Robert Gazda"/>, <contact fullname="Rute Sofia"/>, <contact fullname="Thomas Fossati"/>, <contact fullname="Chonggang Wang"/>, <contact fullname="Marie-José Montpetit"/>, <contact fullname="Carlos J. Bernardos"/>, <contact fullname="Milan Milenkovic"/>, <contact fullname="Dale Seed"/>, <contact fullname="JaeSeung Song"/>, <contact fullname="Roberto Morabito"/>, <contact fullname="Carsten Bormann"/>, and <contact fullname="Ari Keränen"/> for their valuable comments and suggestions on this document.</t>
    </section>

<!--[rfced] Throughout the document, there were certain places we may
     have expected a citation.  Please review cases like the following
     (there may be more, just examples):

 As the number of people working on farming has been decreasing over
 time,...

  *Smart Construction*
      Safety is critical at construction sites.  Every year, many
      construction workers lose their lives because of falls,
      collisions, electric shocks, and other accidents.

 Policy makers have begun to provide frameworks that limit the usage
 of personal data and impose strict requirements on data controllers
 and processors.

-->
  </back>
</rfc>