Content for TS 23.289 Word version: 19.0.0

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7.6 MC service over 5G ProSe 7.6.1 Off network group communication for MC service 7.6.2 Off-network private communication 7.6.3 Use of 5G ProSe UE-to-network relay 7.6.3.1 5G ProSe UE-to-network relay service authorization 7.6.3.2 UE-to-network relay MC service

7.6 MC service over 5G ProSe |R18| p. 106

7.6.1 Off network group communication for MC service p. 106

The procedures and information flows used in TS 23.280, TS 23.379, TS 23.281, and TS 23.282 are reused for Off network group communication for MC service over 5G ProSe with following differences:

Discovery Group ID is replaced by Application Layer Group ID, as specified in TS 23.304.
The ProSe Layer-2 Group ID of the target MC service group may be used by the ProSe layer as the target group info;
The Groupcast mode 5G ProSe Direct Communication procedure in clause 6.4.2 of TS 23.304 is utilized for the establishment of off-network group communication and the following media plane traffic exchanges.

7.6.2 Off-network private communication p. 106

The procedures and information flows used in TS 23.280, TS 23.379, TS 23.281, and TS 23.282 are reused for off-network private communication for MC service over 5G ProSe with following differences:

PPPP (ProSe Per-Packet Priority) is replaced with PQI, as specified in TS 23.304.
The ProSe discovery group ID is replaced with Application layer group ID which identifies a discovery group as specified in TS 23.304. The Application layer group ID and the user info ID of the target MC service user are provisioned to the MC service client in the MC service user profile. The MC service client enables the ProSe layer to determine the IP address for the communication with the target MC service user by providing the Application layer group ID and user info ID of the target MC service user.
Group Member Discovery procedure in TS 23.304 is utilized to enable for the call initiator to determine whether the called MC service user is in the proximity of the calling user prior to the establishment of an off-network private communication.
The Unicast mode 5G ProSe Direct Communication procedure in TS 23.304 is utilized for the establishment of off-network private communication and the following media plane traffic exchanges.

7.6.3 Use of 5G ProSe UE-to-network relay p. 107

7.6.3.1 5G ProSe UE-to-network relay service authorization p. 107

The MC service shall support the capability for 5G ProSe UE-to-network relay to restrict the relayed group communication on a per group basis by using the relay service codes corresponding to the group.

5G ProSe (as specified in TS 23.304) supports layer 2 UE-to-network relay and layer 3 UE-to-network relay. The procedure defined in clause 10.5 of TS 23.280 applies with the following differences:

5G ProSe UE-to-network relay is provisioned that each relay service code is offering layer 2 or layer 3 UE-to-Network Relay service.
5G ProSe remote UE is provisioned that each relay service code is offering layer 2 or layer 3 UE-to-Network Relay service.
5G ProSe Layer-3 UE-to-network relay is provisioned with suitable relay service codes to support access to N3IWF for the case of 5G ProSe Layer-3 UE-to-network relay with the support of N3IWF.

7.6.3.2 UE-to-network relay MC service p. 107

The 5G ProSe UE-to-network relay provides a layer 2 or layer 3 routing service (as specified in TS 23.304) for a 5G ProSe remote UE, when the MC service user on the 5G ProSe remote UE requires to access the MC service via a 5G ProSe UE-to-network relay.

The application layer signalling for the MC service user on a 5G ProSe remote UE using a 5G ProSe UE-to-network relay are identical to the application layer signalling for the MC service user on an on-network UE.