Content for TS 24.577 Word version: 18.1.0
6 A2X communication p. 19
6.1 A2X communication over PC5 p. 19
6.1.1 General p. 19
6.1.2 Unicast mode A2X communication over NR-PC5 p. 19
6.1.2.1 Overview p. 19
6.1.2.2 A2X PC5 unicast link establishment procedure p. 20
6.1.2.2.1 General p. 20
6.1.2.2.2 A2X PC5 unicast link establishment procedure initiation by initiating UE p. 20
6.1.2.2.3 A2X PC5 unicast link establishment procedure accepted by the target UE p. 23
6.1.2.2.4 A2X PC5 unicast link establishment procedure completion by the initiating UE p. 24
6.1.2.2.5 A2X PC5 unicast link establishment procedure not accepted by the target UE p. 25
6.1.2.2.6 Abnormal cases p. 26
6.1.2.3 A2X PC5 unicast link modification procedure p. 26
6.1.2.3.1 General p. 26
6.1.2.3.2 A2X PC5 unicast link modification procedure initiated by initiating UE p. 27
6.1.2.3.3 A2X PC5 unicast link modification procedure accepted by the target UE p. 28
6.1.2.3.4 A2X PC5 unicast link modification procedure completion by the initiating UE p. 29
6.1.2.3.5 A2X PC5 unicast link modification procedure not accepted by the target UE p. 29
6.1.2.3.6 Abnormal cases at the initiating UE p. 30
6.1.2.4 A2X PC5 unicast link release procedure p. 30
6.1.2.4.1 General p. 30
6.1.2.4.2 A2X PC5 unicast link release procedure initiation by initiating UE p. 30
6.1.2.4.3 A2X PC5 unicast link release procedure accepted by the target UE p. 31
6.1.2.4.4 A2X PC5 unicast link release procedure completion by the initiating UE p. 31
6.1.2.4.5 Abnormal cases p. 32
6.1.2.5 A2X PC5 unicast link identifier update procedure p. 32
6.1.2.5.1 General p. 32
6.1.2.5.2 A2X PC5 unicast link identifier update procedure initiation by initiating UE p. 32
6.1.2.5.3 A2X PC5 unicast link identifier update procedure accepted by the target UE p. 33
6.1.2.5.4 A2X PC5 unicast link identifier update procedure acknowledged by the initiating UE p. 34
6.1.2.5.5 A2X PC5 unicast link identifier update procedure completion by the target UE p. 34
6.1.2.5.6 A2X PC5 unicast link identifier update procedure not accepted by the target UE p. 34
6.1.2.5.7 Abnormal cases p. 35
6.1.2.6 A2X PC5 unicast link authentication procedure p. 36
6.1.2.6.1 General p. 36
6.1.2.6.2 A2X PC5 unicast link authentication procedure initiation by the initiating UE p. 36
6.1.2.6.3 A2X PC5 unicast link authentication procedure accepted by the target UE p. 37
6.1.2.6.4 A2X PC5 unicast link authentication procedure completion by the initiating UE p. 38
6.1.2.6.5 A2X PC5 unicast link authentication procedure not accepted by the target UE p. 38
6.1.2.6.5A A2X PC5 unicast link authentication procedure not accepted by the initiating UE p. 38
6.1.2.6.6 Abnormal cases p. 38
6.1.2.7 A2X PC5 unicast link security mode control procedure p. 39
6.1.2.7.1 General p. 39
6.1.2.7.2 A2X PC5 unicast link security mode control procedure initiation by the initiating UE p. 39
6.1.2.7.3 A2X PC5 unicast link security mode control procedure accepted by the target UE p. 41
6.1.2.7.4 A2X PC5 unicast link security mode control procedure completion by the initiating UE p. 43
6.1.2.7.5 A2X PC5 unicast link security mode control procedure not accepted by the target UE p. 43
6.1.2.7.6 Abnormal cases p. 44
6.1.2.8 A2X PC5 unicast link keep-alive procedure p. 44
6.1.2.8.1 General p. 44
6.1.2.8.2 A2X PC5 unicast link keep-alive procedure initiation by the initiating UE p. 45
6.1.2.8.3 A2X PC5 unicast link keep-alive procedure accepted by the target UE p. 46
6.1.2.8.4 A2X PC5 unicast link keep-alive procedure completion by the initiating UE p. 46
6.1.2.8.5 Abnormal cases p. 46
6.1.2.9 Data transmission over A2X PC5 unicast link p. 47
6.1.2.9.1 Transmission p. 47
6.1.2.9.2 Procedure for UE to use provisioned radio resources for A2X communication over PC5 p. 47
6.1.2.10 A2X PC5 unicast link re-keying procedure p. 48
6.1.2.10.1 General p. 48
6.1.2.10.2 A2X PC5 unicast link re-keying procedure initiation by the initiating UE p. 48
6.1.2.10.3 A2X PC5 unicast link re-keying procedure accepted by the target UE p. 49
6.1.2.10.4 A2X PC5 unicast link re-keying procedure completion by the initiating UE p. 49
6.1.2.10.5 Abnormal cases at the initiating UE p. 49
6.1.2.11 A2X PC5 unicast link security p. 50
6.1.2.11.1 Overview p. 50
6.1.2.11.2 Handling of A2X PC5 unicast security contexts p. 50
6.1.2.11.2.1 General p. 50
6.1.2.11.2.2 Establishment of secure exchange of PC5 signalling messages p. 50
6.1.2.11.2.3 Change of security keys p. 51
6.1.2.11.3 Checking of PC5 signalling messages in the UE p. 51
6.1.2.12 PC5 QoS flow establishment over A2X PC5 unicast link p. 51
6.1.2.13 PC5 QoS flow match over A2X PC5 unicast link p. 52
6.1.3 Broadcast mode A2X communication over PC5 p. 53
6.1.3.1 Overview p. 53
6.1.3.2 Transmission of broadcast mode A2X communication over PC5 p. 53
6.1.3.2.1 Initiation p. 53
6.1.3.2.1.1 Requirements for A2X communication over PC5 p. 53
6.1.3.2.1.2 PC5 QoS flow match and establishment p. 54
6.1.3.2.2 Transmission p. 55
6.1.3.2.3 Procedure for UE to use provisioned radio resources for A2X communication over PC5 p. 56
6.1.3.2.4 Privacy of A2X transmission over PC5 p. 58
6.1.3.3 Reception of broadcast mode A2X communication over PC5 p. 58
6.2 A2X communication over Uu p. 59
6.2.1 General p. 59
6.2.2 Transmission of A2X communication over Uu from UE to A2X application server p. 59
6.2.3 Reception of A2X communication over Uu from UE to A2X application server p. 60
6.2.4 Transmission of A2X communication over Uu from A2X application server to UE p. 60
6.2.5 Reception of A2X communication over Uu from A2X application server to UE p. 61
6.2.6 A2X application server discovery p. 63
6.2.7 A2X application server configuration p. 67
6.2.8 A2X MBS parameter discovery p. 68
