3GPP 24.501 v20.0.0 — the document's own text
6.6.2.2 Remote UE report procedure initiation
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
In order to initiate the 5G ProSe remote UE report procedure, the UE shall create a REMOTE UE REPORT message.
The UE shall include information of newly connected or disconnected 5G ProSe remote UEs to the network in the REMOTE UE REPORT message by setting the values of the Remote UE context connected IE or the Remote UE context disconnected IE to the 5G ProSe remote UE identities that are being connected or disconnected, respectively.
The UE shall set the Remote UE ID with:
- the UP-PRUK ID of the 5G ProSe remote UE, if the security for 5G ProSe communication via 5G ProSe UE-to-network relay is performed over user plane as specified in 3GPP TS 33.503 [56];
- the CP-PRUK ID of the 5G ProSe remote UE, if the security for 5G ProSe communication via 5G ProSe UE-to-network relay is performed over control plane as specified in 3GPP TS 33.503 [56]; or
- the PEI of the 5G ProSe remote UE, if the RSC is specific for emergency services as specified in 3GPP TS 24.554 [19E], and the 5G ProSe remote UE is identified by a PEI.
If the UE sets the Remote UE ID with the PRUK ID of the 5G ProSe remote UE and the UP-PRUK ID is in 64-bit string format, the UE shall include the HPLMN ID of the 5G ProSe remote UE.
If the UE allocated an IPv4 address to a 5G ProSe remote UE and enabled UDP usage to the 5G ProSe remote UE, the UE shall include in the REMOTE UE REPORT message the UDP port range assigned to the 5G ProSe remote UE in the NAT function of 5G ProSe layer-3 UE-to-network relay. If the UE allocated an IPv4 address to a 5G ProSe remote UE and enabled TCP usage to the 5G ProSe remote UE, the UE shall include in the REMOTE UE REPORT message the TCP port range assigned to the 5G ProSe remote UE in the NAT function of 5G ProSe layer-3 UE-to-network relay.
The UE shall set the PDU session ID IE to the value of the PDU session associated with the 5G ProSe remote UE connected to the 5G ProSe layer-3 UE-to-network relay UE or disconnected from the 5G ProSe layer-3 UE-to-network relay UE.
The UE shall allocate a PTI value currently not used and shall set the PTI IE of the REMOTE UE REPORT message to the allocated PTI value.
The UE shall transport the REMOTE UE REPORT message and the PDU session ID, using the NAS transport procedure as specified in clause 5.4.5, and the UE shall start timer T3586 (see example in figure 6.6.2.2.1).
