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Content for TS 29.303 Word version: 18.0.0

1… 4… A…

4 General DNS Based Node Selection Description p. 10

4.1 Resource Records p. 10

4.1.1 A and AAAA p. 10

4.1.2 NAPTR p. 10

4.1.3 SRV p. 11

4.2 Selecting Domain Names p. 11

4.3 Identifying Nodes, Services and Protocols p. 11

4.3.1 IETF RFC 3958 Service and Protocol service names for 3GPP p. 11

4.3.2 Identification of canonical node names p. 11

4.3.3 Services from node names or other FQDN identifying a service p. 13

4.3.3.1 General p. 13

4.3.3.2 Procedure p. 13

4.3.3.2.1 S-NAPTR Procedure - General p. 13

4.3.3.2.2 S-NAPTR Procedure for a canonical node name p. 14

4.3.3.3 Services of a PGW from PGW node name (or collocated PGW/GGSN) p. 14

4.3.3.4 Services of a MME from MME node name (or GUTI or 5G-GUTI) p. 15

4.3.3.5 Services of an SGSN from a P-TMSI p. 16

4.3.3.6 Services of an SGW from SGW canonical node name p. 17

4.3.3.7 Services of an MSC Server from MSC Server canonical node name |R10| p. 18

4.3.3.8 Services of an AMF from AMF instance name (or 5G-GUTI) |R15| p. 18

4A SGW/PGW selection using GTP-C load control |R12| p. 19

4A.1 General p. 19

4A.2 Node-level load control p. 19

4A.3 APN-level load control p. 20

5 Procedures for EPC Node Discovery and Selection p. 21

5.1 Procedures for Discovering and Selecting a PGW p. 21

5.1.1 Discovering a PGW for a 3GPP Access p. 21

5.1.1.1 General p. 21

5.1.1.2 Discovering a PGW or collocated PGW/GGSN for a 3GPP Access - S8/Gp roaming case existing PDN p. 23

5.1.1.3 Discovering a PGW or collocated PGW/GGSN for a 3GPP Access - S5/Gn intra-operator existing PDN p. 24

5.1.1.4 Discovering a PGW, collocated PGW/GGSN or GGSN for a 3GPP Access - S5/Gn intra-operator initial attach p. 25

5.1.2 Discovering a PGW for a non-3GPP Access with Network Based Mobility Management p. 25

5.1.2.1 Discovering a PGW for a non-3GPP Access - S2a/S2b initial attach for roaming and non-roaming p. 25

5.1.2.2 Discovering a PGW for a non-3GPP Access - S2a/S2b initial attach and chained PMIP-based S8-S2a/S2b p. 26

5.1.3 Discovering a PGW for a non-3GPP Access with DSMIPv6 p. 26

5.1.3.1 Discovering a PGW for a non-3GPP Access - S2c initial attach p. 26

5.1.4 Discovering a PGW-C/SMF in a PGW-C/SMF Set |R17| p. 27

5.1.4.1 General |R18| p. 27

5.1.4.2 Using the PGW Set FQDN |R18| p. 27

5.1.4.3 Using Alternative PGW-C/SMF FQDNs |R18| p. 27

5.2 Procedures for Discovering and Selecting a SGW p. 27

5.2.1 General p. 27

5.2.2 SGW Selection during TAU or RAU with SGW change - 3GPP roaming case p. 28

5.2.3 SGW Selection during TAU or RAU with SGW change - non-roaming case p. 29

5.2.4 SGW Selection during non-3GPP handover to 3GPP access p. 30

5.3 Procedures for Discovering and Selecting a PGW and SGW p. 30

5.4 Procedures for Discovering and Selecting an MME p. 31

5.4A Procedures for Discovering and Selecting an AMF with N26 interface |R15| p. 33

5.4B Procedures for Discovering and Selecting an MME_SRVCC |R16| p. 33

5.5 Procedures for Discovering and Selecting an SGSN p. 34

5.5.1 General p. 34

5.5.2 SGSN initial target selection based on RAI (UTRAN target/GERAN Iu mode target/GERAN Gb mode target) p. 34

5.5.3 SGSN initial target selection based on RNC-ID (UTRAN target/GERAN Iu mode target) p. 36

5.5.4 Void

5.6 GW Selection for SIPTO |R10| p. 37

5.6.1 SIPTO above RAN |R12| p. 37

5.6.2 SIPTO at the local network with LGW collocated with the (H)(e)NB |R12| p. 37

5.6.3 SIPTO at the local network with stand-alone GW (LGW collocated with SGW) |R12| p. 37

5.6.4 SIPTO for eHRPD |R12| p. 38

5.7 Procedures for Discovering and Selecting an MSC Server |R10| p. 38

5.7.1 General p. 38

5.7.2 Selection of the MSC server enhanced for SRVCC based on target RAI (UTRAN / GERAN Iu & A/Gb mode target) p. 38

5.8 Procedures to support Dedicated Core Networks |R13| p. 39

5.8.1 General p. 39

5.8.2 SGW, PGW and GGSN Selection Procedure p. 39

5.8.3 MMEGI and Null-NRI/SGSN Group ID Retrieval Procedure p. 40

5.8.4 MME and SGSN Selection Procedure p. 41

5.8.5 AMF Selection Procedure |R16| p. 41

5.9 Procedures to support Cellular Internet of Things |R13| p. 42

5.9.1 DCN based solution p. 42

5.9.2 Alternative solution p. 42

5.10 Procedures for Discovering and Selecting an SGW-U |R14| p. 42

5.11 Procedures for Discovering and Selecting PGW-U |R14| p. 43

5.12 Procedures to select a node supporting a particular network capability |R15| p. 44

5.12.1 General principles p. 44

5.12.1.1 General p. 44

5.12.1.2 Selecting a node supporting a particular network capability within a Dedidated Core Network p. 45

5.12.1.3 Selecting an SGW or PGW supporting a particular network capability p. 45

5.12.2 Procedures to support Dual Connectivity with NR p. 46

5.12.2.1 General p. 46

5.12.3 Procedures to support interworking with 5GC p. 46

5.12.3.1 General p. 46

5.12.3.2 PGW-C/SMF selection p. 46

5.12.3.3 PGW-U/UPF selection p. 47

5.12.3.4 PGW-U/UPF/MB-UPF selection |R17| p. 47

5.13 Procedures to support Ethernet PDN Connection in EPS |R16| p. 47

5.13.1 DCN based solution p. 47

5.13.2 Network Capability based solution p. 47

5.13.3 Alternative solutions p. 47

5.14 Procedures for Discovering and Selecting a UCMF |R16| p. 48

6 Procedures for OAM System Node Discovery |R10| p. 48

6.1 Procedures for Relay Node OAM System Discovery p. 48

6.1.1 General p. 48

6.1.2 OAM System Selection based on Type Allocation Code p. 48

7 Procedures for NF Discovery in 5G System |R15| p. 48

7.1 General p. 48

7.2 Procedure for AMF Discovery by 5G-AN p. 49