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Content for TR 23.975 Word version: 18.0.0

0… 4…

4 Baseline Architecture for IPv4 and IPv6 Co-existence p. 8

5 IPv6 migration scenarios p. 10

5.1 Scenario 1: Dual-stack connectivity with Limited Public IPv4 Address Pools p. 10

5.2 Scenario 2: Dual Stack connectivity with Limited Private IPv4 Address Pools p. 10

5.3 Scenario 3: UEs with IPv6-only connection and applications using IPv6 p. 10

5.4 Scenario 4: IPv4 applications running on a Dual-stack host with an assigned IPv6 prefix and a shared IPv4 address and having to access IPv4 services p. 11

6 High level requirements p. 11

7 Solutions and functional flows description p. 11

7.1 Solution 1 - Dual-stack deployment combined with NAPT44 p. 11

7.1.1 Overview p. 11

7.1.2 Description p. 11

7.1.2.1 Dual-stack deployment p. 11

7.1.2.2 NAPT44 deployment options p. 12

7.1.2.2.1 Basic deployments p. 12

7.1.2.2.2 Deployments with overlapping RFC 1918 [26] address spaces p. 12

7.1.2.2.3 Identity considerations when using overlapping RFC 1918 [26] address spaces p. 13

7.1.3 Functional Description p. 13

7.1.4 Information flows p. 14

7.1.5 Evaluation p. 14

7.1.6 Applicability p. 15

7.2 Transition Solution: Gateway-Initiated Dual-Stack Lite p. 15

7.2.1 GI-DS-lite Overview p. 15

7.2.2 GI-DS-lite Evaluation p. 17

7.2.3 GI-DS-lite Applicability p. 19

7.3 Solution 3 - MS/UE IPv6-only deployment with stateful NAT64 support p. 19

7.3.1 Overview p. 19

7.3.2 Description p. 19

7.3.3 Functional Description p. 19

7.3.4 Server Flow Example p. 20

7.3.5 Evaluation p. 21

7.3.6 Applicability p. 22

8 Evaluation p. 22

9 Summary p. 22

10 Recommendations p. 22

A Reference Scenarios for NAT in the EPC p. 23

A.1 UE and AF In the same Address Realm p. 23

A.2 NAT between UE and AF p. 24

A.2.1 Overlapping IPv4 address realms p. 25

B Overview of Solutions for IPv6 Transition p. 28

B.1 Solution 1 - Dual-Stack Lite Architecture p. 28

B.1.1 Solution 1 Description p. 28

B.1.1.1 Plain IPv6 encapsulation in 3GPP architecture p. 28

B.1.1.2 GRE encapsulation p. 29

B.1.1.3 GTP encapsulation p. 29

B.1.1.4 DSMIP6 p. 29

B.2 Solution 2 - A+P architecture p. 30

B.2.4 Port Range Router (PRR) function p. 30

B.2.4.1 General p. 30

B.2.4.2 PRR in binding mode p. 30

B.2.4.3 PRR in stateless mode p. 31

B.2.6 Requirement on UEs p. 31

B.2.7 Updating legacy UEs p. 32

B.2.8 Co-existence with other transition techniques p. 32

B.2.9 Applicability p. 32

B.2.10 Evaluation p. 32

B.3 Solution 3 - Protocol translation p. 33

B.4 Solution 4 - Per-interface NAT44 p. 34

B.4.1 Overview p. 34

B.4.2 Evaluation p. 34

B.4.3 Applicability p. 35

B.5 Void

B.6 Void

B.7 Solution 7 - BIH/NAT64 p. 35

B.7.1 Overview p. 35

B.7.2 Solution Description p. 36

B.7.3 Service Flow Example p. 36

B.7.4 Evaluation p. 37

B.7.5 Applicability p. 37

C Building Block: Dual-Stack EPS Bearer Contexts in EPS/GPRS p. 39

C.1 Description p. 39

C.2 Functional Description p. 39

C.3 Information flows p. 40

C.4 Applicability p. 40

$ Change History p. 41