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Content for  TS 29.303  Word version:  17.1.0

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1  ScopeWord‑p. 8

The present document describes Domain Name System (DNS) Procedures for the Evolved Packet System. This document covers the Evolved Packet Core gateway node selection using DNS (e.g. SGW and PGW nodes) excluding all User Equipment (UE) initiated DNS-based discovery and selection procedures.
The present document specifies functions, procedures and information which apply to GERAN Iu mode. However, functionality related to GERAN Iu mode is neither maintained nor enhanced.
The present document also describes the Domain Name System (DNS) Procedures for the Evolved Packet System interworking with the 5G System, as specified in TS 23.501 and TS 23.502.

2  References

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 23.003: "Numbering, addressing and identification".
GSMA PRD IR.67: "DNS Guidelines for Operators" Version 2.1.0.
RFC 3596:  "DNS Extensions to Support IP Version 6".
RFC 3403:  " Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) Database".
RFC 2782:  "A DNS RR for specifying the location of services (DNS SRV)".
RFC 3958:  "Domain-Based Application Service Location Using SRV RRs and the Dynamic Delegation Discovery Service (DDDS)".
RFC 3401:  "Dynamic Delegation Discovery System (DDDS) Part One: The Comprehensive DDDS".
TS 23.401: "GPRS enhancements for E-UTRAN access ".
TS 25.413: "UTRAN Iu interface RANAP signalling".
RFC 2671:  "Extension Mechanisms for DNS (EDNS0)".
RFC 3402:  "Dynamic Delegation Discovery System (DDDS) Part Two: The Algorithm".
RFC 2308:  "Negative Caching of DNS Queries (DNS NCACHE)".
RFC 3330:  "Special Use IPv4 Addresses".
RFC 3849:  "IPv6 Address Prefix Reserved for Documentation".
TS 23.060: "General Packet Radio Service (GPRS); Service Description; Stage 2".
TS 36.413: "Evolved Universal Terrestrial Access Network (E-UTRAN); S1 Application Protocol (S1AP)".
TS 23.216: "Single Radio Voice Call Continuity (SRVCC)".
TS 36.413: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)".
TS 36.300: " Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
TS 29.274: "3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3".
3GPP2 X.S0057 B: "E UTRAN - eHRPD Connectivity and Interworking: Core Network Aspects".
TS 23.402: "Architecture enhancements for non-3GPP accesses".
TS 29.244: "Interface between the Control Plane and the User Plane of EPC Nodes; stage 3".
TS 29.272: "Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) related interfaces based on Diameter protocol".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 29.273: "Evolved Packet System (EPS); 3GPP EPS AAA interfaces".
TS 23.007: "Restoration procedures".

3  Definitions, symbols and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the terms and definitions 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.
Domain Name System as defined in RFC 1034, RFC 1035, and as used in 3GPP in TS 23.003 and GSMA PRD IR.67 [5].
The phrase "operators shall provision" in this document is intended to convey what is required to provision in DNS to provide DNS based selection for the corresponding function documented here. If there is a non-DNS procedure in an operator's network for that function then there is no functional requirement for the operator to provision such DNS records.
The term "S4-SGSN" refers to a Release-8 SGSN that has at least one set of S4/S3/S16 interfaces enabled.
The term "Release 8 SGSN supporting only Gn/Gp" refers to a Release 8 or later SGSN that either explicitly does not support S4 interfaces or all S4/S3/S16 interfaces are disabled due to operator policy. Such a node cannot use an SGW but can use a collocated PGW/GGSN. See TS 23.401 Annex D for use cases.
The term "Release-8 SGSN" applies to either case.

3.2  AbbreviationsWord‑p. 10

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.
Dedicated Core Network
Dynamic Delegation Discovery Service
Domain Name System
E-UTRAN Cell Global Identification
evolved High Rate Packet Data
Fully Qualified Domain Name
Globally Unique Temporary Identity
eHRPD Serving Gateway
Local Gateway
Local IP Access
New Radio
PDN Gateway
Routing Area Identity
Serving Gateway
Selected IP Traffic Offload
Tracking Area Identity
Tracking Area Update
Trusted WLAN Access Network

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