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Content for  TS 23.287  Word version:  18.4.0

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4.3 Architecture reference model for interworking with EPS V2X  4.4 Functional entities  4.4.1 UE  4.4.2 PCF  4.4.3 V2X Application Server  4.4.4 AMF  4.4.5 UDM  4.4.6 UDR  4.4.7 NRF  4.4.8 NEF 
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4.3  Architecture reference model for interworking with EPS V2X  p. 14

The interworking between 5GS V2X and EPS V2X does not require any new interface between 5GS V2X and EPS V2X architectures and does not impact existing network function entities in EPC and 5GC. Figure 4.3-1 shows one of the architecture reference models.
Reproduction of 3GPP TS 23.287, Fig. 4.3-1: Architecture for interworking with EPS V2X, Local breakout roaming
Figure 4.3-1: Architecture for interworking with EPS V2X, Local breakout roaming
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Legend:
  • The functions and reference points for EPS V2X are defined in TS 23.285.

4.4  Functional entities  p. 15

4.4.1  UE  p. 15

In addition to the functions defined in TS 23.501, the UE may support the following functions:
  • Report the V2X Capability and PC5 Capability for V2X to 5GC over N1 reference point.
  • Indicate V2X Policy Provisioning Request in UE Policy Container for UE triggered V2X Policy provisioning.
  • Receive the V2X parameters from 5GC over N1 reference point.
  • Procedures for V2X communication over PC5 reference point.
  • Configuration of parameters for V2X communication (e.g., destination Layer-2 IDs, radio resource parameters, V2X Application Server address information, mapping between V2X service types and V2X frequencies, see clause 5.1). These parameters can be pre-configured in the UE, or, if in coverage, provisioned or updated by signalling over the N1 reference point from the PCF in the HPLMN or over V1 reference point from the V2X Application Server.
  • Provided with the following for receiving MBS based V2X traffic:
  • Provisioned with MBS session announcement for receiving V2X Application Server information via MBS as specified in clauses 5.1.1 and 5.1.3.1.
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4.4.2  PCF  p. 16

In addition to the functions defined in TS 23.501, the PCF includes the function to provision the UE and AMF with necessary parameters in order to use V2X communication:
  • May determine the V2X Policy/Parameter for specific PC5 RAT to provision to the UE based on the received UE's PC5 Capability for V2X.
  • 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.
  • Provision the UEs with authorization and policy parameters for V2X communication over PC5 reference point.
  • Provision the UEs with policy parameters for V2X communication over Uu reference point for unicast.
  • Provision the UEs with policy parameters for V2X communication over Uu reference point for MBS.
  • Provision the AMF with PC5 QoS parameters as defined in clause 5.4.2 used by NG-RAN.
  • Retrieve V2X parameters from UDR.
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4.4.3  V2X Application Server  p. 16

The V2X Application Server (V2X AS) includes AF functionality, and may support at least the following capabilities:
For V2X services handling,
  • Receive uplink data from the UE over unicast.
  • Send downlink data to the UE over unicast and/or MBS.
  • Request QoS Sustainability Analytics for potential QoS changes in a geographic area from NWDAF via NEF.
  • Act as an AF/AS in clause 5.1 and Annex A of TS 23.247, e.g. request NEF/MBSF for allocation/de-allocation of a set of TMGIs, initiate multicast or broadcast service from the 5GC by providing service information including QoS requirement to 5GC.
  • Perform MBS service area mapping as specified in clause 6.4.3.1.
For V2X service parameters provisioning,
  • Provision the 5GC with parameters for V2X communications over PC5 and Uu reference points.
  • Provision the UE with parameters for V2X communications over PC5 reference point and/or Uu reference point.
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4.4.4  AMF  p. 16

In addition to the functions defined in TS 23.501, the AMF performs the following functions:
  • Obtain from UDM the subscription information related to V2X and store them as part of the UE context data.
  • Select a PCF supporting V2X Policy/Parameter provisioning and report the PC5 Capability for V2X to the selected PCF.
  • Obtain from PCF the PC5 QoS information related to V2X and store it as part of the UE context data.
  • Provision the NG-RAN with indication about the UE authorization status about V2X communication over PC5 reference point.
  • Provision the NG-RAN with PC5 QoS parameters related to V2X communication.
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4.4.5  UDM  p. 17

In addition to the functions defined in TS 23.501, the UDM performs the following functions:
  • Subscription management for V2X communication over PC5 reference point.

4.4.6  UDR  p. 17

In addition to the functions defined in TS 23.501, the UDR performs the following functions:
  • Stores V2X service parameters.

4.4.7  NRF  p. 17

In addition to the functions defined in TS 23.501, the NRF performs the following functions:
  • PCF discovery by considering V2X capability.

4.4.8  NEF |R17|  p. 17

The high-level functions are the same as defined in TS 23.501.
For Application Functions to provide service specific information to the 3GPP network, the NEF supports additional V2X service parameters as specified in clause 6.2.5.

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