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Content for TS 29.281 Word version: 18.0.0

1… 4…

4 General p. 9

4.1 GTP Path p. 9

4.2 GTP-U Tunnels p. 9

4.2.1 GTP-U Tunnel description p. 9

4.2.2 IP transport p. 10

4.2.3 GTP-U Tunnel IP transport p. 10

4.2.4 Ingress GTP tunnel (GTPv1-U sending endpoint) p. 10

4.2.5 Egress GTP tunnel (GTPv1-U receiving endpoint) p. 10

4.2.6 IP Multicast Distribution of User Plane Data for MBMS and MBS p. 11

4.2.6.1 General |R17| p. 11

4.2.6.2 IP multicast distribution of User Plane Data |R17| p. 11

4.3 GTP-U Protocol Entity p. 11

4.3.0 General |R11| p. 11

4.3.1 Handling of Sequence Numbers p. 12

4.4 Protocol stack p. 12

4.4.0 GTP-PDU Stacks |R10| p. 12

4.4.1 UDP/IP p. 13

4.4.2 UDP header and port numbers p. 13

4.4.2.0 General |R11| p. 13

4.4.2.1 Echo Request Message p. 14

4.4.2.2 Echo Response Message p. 14

4.4.2.3 Encapsulated T-PDUs p. 14

4.4.2.4 Error Indication p. 14

4.4.2.5 Supported Extension Headers Notification p. 14

4.4.2.6 End Marker |R10| p. 14

4.4.2.7 Tunnel Status |R17| p. 14

4.4.3 IP header and IP addresses p. 14

4.4.3.1 Echo Request Message p. 14

4.4.3.2 Echo Response Message p. 14

4.4.3.3 Encapsulated T-PDUs p. 14

4.4.3.4 Error Indication p. 15

4.4.3.5 Supported Extension Headers Notification p. 15

4.4.3.6 End Marker |R10| p. 15

4.4.3.7 Tunnel Status |R17| p. 15

4.5 Transmission Order and Bit Definitions p. 15

4.6 New Functionality p. 15

5 GTP-U header p. 15

5.1 General format p. 15

5.2 GTP-U Extension Header p. 17

5.2.1 General format of the GTP-U Extension Header p. 17

5.2.2 Extension Header types p. 19

5.2.2.1 UDP Port p. 19

5.2.2.2 PDCP PDU Number p. 19

5.2.2.2A Long PDCP PDU Number |R13| p. 19

5.2.2.3 Service Class Indicator |R11| p. 20

5.2.2.4 RAN Container |R12| p. 21

5.2.2.5 Xw RAN Container |R13| p. 21

5.2.2.6 NR RAN Container |R15| p. 22

5.2.2.7 PDU Session Container |R15| p. 22

6 GTP-U Message Formats p. 23

6.1 General p. 23

6.2 Presence requirements of Information Elements p. 23

7 GTP-U Messages p. 23

7.1 General p. 23

7.2 Path Management Messages p. 24

7.2.1 Echo Request p. 24

7.2.2 Echo Response p. 24

7.2.3 Supported Extension Headers Notification p. 25

7.3 Tunnel Management Messages p. 25

7.3.1 Error Indication p. 25

7.3.2 End Marker p. 25

7.3.2.1 General |R16| p. 25

7.3.2.2 End Marker in EPS |R16| p. 26

7.3.2.3 End Marker in 5GS |R16| p. 26

7.3.3 Tunnel Status |R17| p. 26

8 Information Elements p. 27

8.1 Information Element Types p. 27

8.2 Recovery p. 27

8.3 Tunnel Endpoint Identifier Data I p. 28

8.4 GTP-U Peer Address p. 28

8.5 Extension Header Type List p. 28

8.6 Private Extension p. 29

8.7 GTP-U Tunnel Status Information |R17| p. 29

8.8 Recovery Time Stamp |R17| p. 30

9 Error Handling p. 30

9.1 Protocol Errors p. 30

9.2 Path Failure p. 30

10 Security p. 30

11 Reliable Delivery of Signalling Messages p. 30

12 GTP Parameters p. 31

12.1 General p. 31

12.2 Timers p. 31

12.3 Others p. 31

13 Tunnelling Scenarios p. 31

13.1 General p. 31

13.2 Tunnelling between SGWs p. 31

13.3 Transfer of the user plane data between PDN GWs p. 31

13.4 Tunnelling between SGSNs p. 31

13.5 Tunnelling between Source RNC and Target RNC p. 32

13.6 Transfer of the user plane data between GGSNs p. 32

13.7 Tunnelling between RNC and eNodeB |R11| p. 32

13.8 Tunnelling between SGSN and eNodeB |R11| p. 32

13.9 Tunnelling between Source eNodeB and Target eNodeB |R12| p. 32

13.10 Tunnelling between SGSN and RNC |R13| p. 32

13.11 Tunnelling between SGSN and SGW |R13| p. 32

13.12 Tunnelling between SGW and eNodeB |R13| p. 32

13.13 Tunnelling between SGW and RNC |R13| p. 33

13.14 Tunnelling between SGW and SGSN |R13| p. 33

A (Normative) PDU session user plane protocol over N9, N3mb and N19mb |R15| p. 34

$ Change history p. 34