Content for  TR 23.748  Word version:  17.0.0

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1  Scopep. 12

The Technical Report studies and performs evaluations of potential architecture enhancements to support Edge Computing (EC) in the 5G Core network (5GC). Specifically, two objectives are included:
Objective 1:
To study the potential system enhancements for enhanced Edge Computing support, including:
  • Discovery of IP address of application server deployed in Edge Computing environment;
  • 5GC enhancements to support for seamless change of application server serving the UE;
  • How to efficiently (with a low delay) provide local application servers with information on e.g. the QoS condition of the data path;
  • Supporting for traffic steering in N6-LAN deployed in Edge Computing environment, including support for end-user traffic sent to the central N6 interface to the DN after having been processed by local application server(s);
  • Supporting PSA change when the application server does not support notifications of UE IP address change;
  • Supporting I-SMF insertion or reselection based on AF request to route the traffic to application server deployed in Edge Computing environment.
Objective 2:
To provide deployment guidelines for typical Edge Computing use cases, e.g. URLLC, V2X, AR/VR/XR, UAS, 5GSAT, and CDN etc, including:
  • Deployment guidelines based on the existing Rel-15/16 Edge Computing enablers, such as LADN, in TS 23.501 and TS 23.502;
  • Additional deployment guidelines related to any 5GS Edge Computing enhancements defined as part of the first objective.

2  Referencesp. 12

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.501: "System Architecture for the 5G System".
TS 23.502: "Procedures for the 5G System".
TS 23.503: "Policy and Charging Control Framework for the 5G System".
TR 23.758: "Study on application architecture for enabling Edge Applications".
TS 22.261: "Service requirements for the 5G system".
RFC 7871:  "Client Subnet in DNS Queries".
RFC 1546:  "Host Anycasting Service".
RFC 1034:  "Domain Names - implementation and specification".
RFC 7858:  "Specification for DNS over Transport Layer Security (TLS)".
RFC 8484:  "DNS Queries over HTTPS (DoH)".
3GPP TS 23.558: "Architecture for enabling Edge Applications".
RFC 7157:  "IPv6 Multihoming without Network Address Translation".
RFC 1122:  "Requirements for Internet Hosts - Communication Layer".
TS 38.300: "NR; Overall description; Stage-2".
RFC 8311:  "Relaxing Restrictions on Explicit Congestion Notification (ECN) Experimentation".
draft-ietf-tsvwg-l4s-arch-06  " Low Latency, Low Loss, Scalable Throughput (L4S) Internet Service: Architecture".
draft-ietf-tsvwg-ecn-l4s-id-10  "Identifying Modified Explicit Congestion Notification (ECN) Semantics for Ultra-Low Queuing Delay (L4S)".
TS 23.222: "Common API Framework for 3GPP Northbound APIs".
TS 33.122: "Security aspects of Common API Framework (CAPIF) for 3GPP northbound APIs".
TS 32.421: "Subscriber and equipment trace; Trace concepts and requirements".
TS 28.552: "Management and orchestration; 5G performance measurements".
TS 28.533: "Management and orchestration; Architecture framework".
RFC 7556:  "Multiple Provisioning Domain Architecture".
RFC 6731:  "Improved Recursive DNS Server Selection for Multi-Interfaced Nodes".
RFC 8684:  "TCP Extensions for Multipath Operation with Multiple Addresses".
RFC 7681:  "Email Exchange of Secondary School Transcripts".
RFC 4191:  "Default Router Preferences and More-Specific Routes".
TS 29.503: "5G System; Unified Data Management Services; Stage 3".
TS 29.508: "Session Management Event Exposure Service; Stage 3".
RFC 4861:  "Neighbor Discovery for IP version 6 (IPv6)".
RFC 8106:  "IPv6 Router Advertisement Options for DNS Configuration".
RFC 8094:  "DNS over Datagram Transport Layer Security (DTLS) ".
TS 32.422: "Telecommunication management; Subscriber and equipment trace; Trace control and configuration management".
TS 28.622: "Telecommunication management; Generic Network Resource Model (NRM) Integration Reference Point (IRP); Information Service (IS)".
TS 32.423: "Telecommunication management; Subscriber and equipment trace; Trace data definition and management".
TS 33.501: "Security architecture and procedures for 5G System".
TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".
TS 24.501: "Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
TS 29.518: "5G System; Access and Mobility Management Services; Stage 3".
TS 29.244: "Interface between the Control Plane and the User Plane nodes".
RFC 8300:  "Network Service Header (NSH)".

3  Definitions of terms and abbreviationsp. 14

3.1  Termsp. 14

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Edge Application Server: An Application Server resident in the Edge Hosting Environment.
Edge Hosting Environment: An environment providing support required for Edge Application Server's execution.

3.2  Abbreviationsp. 14

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
Edge Application Server

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