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Content for  TS 23.287  Word version:  17.1.0

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6  Functional description and information flowsWord‑p. 38

6.1  Control and user plane stacksWord‑p. 38

6.1.1  User plane for NR PC5 reference point supporting V2X servicesWord‑p. 38

Figure 6.1.1-1 depicts a user plane for NR PC5 reference point, i.e. PC5 User Plane Protocol stack.
Copy of original 3GPP image for 3GPP TS 23.287, Figure 6.1.1-1: User Plane for NR PC5 reference point
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Legend:
  • PC5-U: The SDAP/PDCP/RLC/MAC/PHY functionality is specified in TS 38.300.
  • For PDCP SDU type "Non-IP", a "Non-IP Type" header included in the SDU by upper layer to indicate the type of non-IP messages carried will be specified in stage 3 specification.
IP and Non-IP PDCP SDU types are supported for the V2X communication over PC5 reference point.
For IP PDCP SDU type, only IPv6 is supported. The IP address allocation and configuration are as defined in clause 5.6.1.1.
The Non-IP PDCP SDU contains a Non-IP Type header, which indicates the V2X message family used by the application layer, e.g. IEEE 1609 family's WSMP [18], ISO defined FNTP [19], CCSA defined DSMP [27].
The packets from V2X application layer are handled by the V2X layer before transmitting them to the AS layer, e.g. V2X layer maps the IP/Non IP packets to PC5 QoS Flow and marks the corresponding PFI.
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6.1.2  Control plane for NR PC5 reference point supporting V2X servicesWord‑p. 39

Figure 6.1.2-1 depicts a control plane for NR PC5 reference point, i.e. PC5 Signalling Protocol stack.
Copy of original 3GPP image for 3GPP TS 23.287, Figure 6.1.2-1: Control Plane for NR PC5 reference point
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Legend:
  • PC5-S Protocol: The protocol used for the control plane signalling over the PC5 reference point for the secure layer-2 link as specified in clause 6.3.3.
  • The PDCP/RLC/MAC/PHY functionality is specified in TS 38.300.

6.2  Procedures for Service Authorization and Provisioning to UEWord‑p. 39

6.2.1  GeneralWord‑p. 39

The procedures for service authorization and provisioning to UE may be initiated by the PCF (as described in clause 6.2.2), by the UE (as described in clause 6.2.4), or by the AF (as described in clause 6.2.5).

6.2.2  PCF based Service Authorization and Provisioning to UEWord‑p. 39

For PCF based Service Authorization and Provisioning to UE, the Registration procedures as defined in clause 4.2.2.2 of TS 23.502, UE Policy Association Establishment procedure as defined in clause 4.16.11 of TS 23.502 and UE Policy Association Modification procedure as defined in clause 4.16.12 of TS 23.502 apply with the following additions:
  • If the UE indicates V2X capability in the Registration Request message and if the UE is authorized to use V2X service based on subscription data, the AMF selects the PCF which supports V2X Policy/Parameter provisioning as described in clause 6.2.3 and establishes a UE policy association with the PCF for V2X Policy/Parameter delivery.
  • If the AMF receives the PC5 capability for V2X in the Registration Request message from UE, the AMF further reports the PC5 capability for V2X to the selected PCF. The PCF may determine the V2X Policy/Parameter for specific PC5 RAT based on the received UE's PC5 capability for V2X.
  • If the UE supports V2X communication and it does not have valid V2X policy/parameters, the UE includes the UE Policy Container with indicating the V2X Policy Provisioning Request during registration procedure.
  • If the UE indicates the V2X Policy Provisioning Request in the UE Policy Container, the PCF determines whether to provision V2X Policy/parameters for V2X communication over PC5 reference point and/or V2X communication over Uu reference point to the UE, as specified in clause 6.1.2.2.2 of TS 23.503, and the PCF provides the V2X Policy/parameters to the UE by using the procedure as defined in clause 4.2.4.3 of TS 23.502.
The PCF may update the V2X Policy/parameters to the UE in following conditions:
  • UE Mobility, e.g. UE moves from one PLMN to another PLMN. This is achieved by using the procedure of UE Policy Association Modification initiated by the AMF, as defined in clause 4.16.12.1 of TS 23.502.
  • When there is a subscription change in the list of PLMNs where the UE is authorized to perform V2X communication over PC5 reference point. This is achieved by using UE Policy Association Modification initiated by the PCF procedure as defined in clause 4.16.12.2 of TS 23.502.
  • When there is a change of service specific parameter as described in clause 4.15.6.7 of TS 23.502.
If the serving PLMN is removed from the list of PLMNs in the service authorization parameters, the service authorization is revoked in the UE.
When the UE is roaming, the change of subscription resulting in updates of the service authorization parameters are transferred to the UE by H-PCF via V-PCF.
The UE may perform UE triggered Policy Provisioning procedure to the PCF as specified in clause 6.2.4 when the UE determines the V2X Policy/Parameter is invalid (e.g. Policy/Parameter is outdated, missing or invalid).
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6.2.3  PCF discoveryWord‑p. 40

PCF discovery and selection mechanism defined in clause 6.3.7.1 of TS 23.501 applies with the following addition to enable a PCF instance is selected for V2X service and for UE:
  • Based on the indication from the UE and/or UE subscription data during the Registration procedure as specified in clause 6.2.2, the AMF may include the V2X capability indication in the Nnrf_NFDiscovery_Request message as the optional input parameter. If provided, the NRF takes the information into account for discovering the PCF instance.
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6.2.4  Procedure for UE triggered V2X Policy provisioningWord‑p. 40

The UE triggered Policy Provisioning procedure is initiated by the UE to request V2X Policy/Parameter from the PCF when UE determines the V2X Policy/Parameter is invalid in the following cases:
  • if the validity timer indicated in the V2X Policy/Parameter expires;
  • if there are no valid parameters, e.g. for the V2X service type a UE wants to use, for current area, or due to abnormal situation.
Copy of original 3GPP image for 3GPP TS 23.287, Figure 6.2.4-1: UE triggered V2X Policy provisioning procedure
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Step 1.
The UE sends the UE Policy provisioning request including the UE Policy Container (V2X Policy Provisioning Request) to the AMF.
Step 2.
The AMF sends the Npcf_UEPolicyControl_Update request to the PCF including the UE Policy Container received from UE.
Step 3.
The UE Policy delivery procedure defined in clause 4.2.4.3 of TS 23.502 is triggered.

6.2.5  AF-based service parameter provisioning for V2X communications over control planeWord‑p. 41

The V2X Application Server can provision the 5GC with V2X service parameters via NEF as depicted in clause 4.2.2. For V2X service parameter provisioning, the procedure defined in clause 4.15.6.7 of TS 23.502 is performed with the following considerations:
  • The AF in TS 23.502 is considered as V2X Application Server in this specification.
  • Service Description indicates V2X service domain information.
  • Service Parameters include policy/provisioning parameters for V2X communications over Uu and PC5. The detailed information on the parameters is described in clause 5.1.
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