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Content for  TS 23.287  Word version:  18.4.0

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6.3 Procedures for V2X communication over PC5 reference point  6.3.1 Broadcast mode V2X communication over PC5 reference point  6.3.2 Groupcast mode V2X communication over PC5 reference point 
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6.3  Procedures for V2X communication over PC5 reference point  p. 45

6.3.1  Broadcast mode V2X communication over PC5 reference point  p. 45

To perform V2X communication over PC5 reference point in broadcast mode operation, the UE is configured with the related information as described in clause 5.1.2.
Figure 6.3.1-1 shows the procedure for broadcast mode of V2X communication over PC5 reference point.
Reproduction of 3GPP TS 23.287, Fig. 6.3.1-1: Procedure for Broadcast mode of V2X communication over PC5 reference point
Figure 6.3.1-1: Procedure for Broadcast mode of V2X communication over PC5 reference point
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Step 1.
The V2X layer of receiving UE(s) determines the following for the broadcast mode communication reception:
  • the destination Layer-2 ID for broadcast reception as specified in clause 5.6.1.2;
  • the PC5 QoS parameters for this broadcast V2X service as specified in clause 5.4.1.1;
  • the NR Tx Profile based on the configuration as specified in clause 5.1.2.1;
  • the NR eTx Profile based on the configuration as specified in clause 5.1.2.1; and
  • the radio frequency information based on the configuration as specified in clause 5.1.2.1.
The destination Layer-2 ID, the NR Tx Profile and the PC5 QoS parameters are passed down to the AS layer of receiving UE(s) for the reception. When there is no NR Tx Profile available to be mapped for this broadcast V2X service, the V2X layer does not provide NR Tx Profile to the AS layer. When there are the other V2X service type(s) that use the same destination Layer-2 ID with this broadcast V2X service, the V2X layer determines whether and how to provide the NR Tx Profile to the AS layer as specified in clause 5.9.
The AS layer of receiving UE(s) determines the PC5 DRX parameter values as specified in clause 5.9.
The radio frequency information for this broadcast V2X service is also passed down to the AS layer of receiving UE(s) for the reception.
Step 2.
The transmitting UE V2X application layer provides data unit and may provide V2X Application Requirements specified in clause 5.4.1.2 to V2X layer.
Step 3.
The V2X layer of transmitting UE determines the following for the broadcast mode communication transmission:
  • the destination Layer-2 ID for broadcast as specified in clause 5.6.1.2;
  • the PC5 QoS parameters for this broadcast V2X service as specified in clauses 5.4.1.1 and 5.4.1.2;
  • the NR Tx Profile based on the configuration as specified in clause 5.1.2.1; and
  • the radio frequency information based on the configuration as specified in clause 5.1.2.1.
The transmitting UE self-assigns the source Layer-2 ID as specified in clause 5.6.1.1.
The source Layer-2 ID, the destination Layer-2 ID, the NR Tx Profile and the PC5 QoS parameters are passed down to the AS layer of transmitting UE for the transmission. When there is no NR Tx Profile available to be mapped for this broadcast V2X service, the V2X layer does not provide NR Tx Profile to the AS layer. When there are the other V2X service type(s) that use the same destination Layer-2 ID with this broadcast V2X service, the V2X layer determines whether and how to provide the NR Tx Profile to the AS layer as specified in clause 5.9.
The AS layer of transmitting UE determines the PC5 DRX parameter values as specified in clause 5.9.
The NR eTx Profile if available and the radio frequency information per PC5 QoS Flow for this broadcast V2X service are also passed down to the AS layer of transmitting UE for the transmission as specified in clause 5.11.
Step 4.
The transmitting UE sends the V2X service data using the source Layer-2 ID and the destination Layer-2 ID.
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6.3.2  Groupcast mode V2X communication over PC5 reference point  p. 47

To perform groupcast mode of V2X communication over PC5 reference point, the UE is configured with the related information as described in clause 5.1.2.1.
Figure 6.3.2-1 shows the procedure for groupcast mode of V2X communication over PC5 reference point.
Reproduction of 3GPP TS 23.287, Fig. 6.3.2-1: Procedure for groupcast mode of V2X communication over PC5 reference point
Figure 6.3.2-1: Procedure for groupcast mode of V2X communication over PC5 reference point
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Step 1.
V2X group management is carried out by the V2X application layer and is out of scope of this specification.
Step 2.
The V2X application layer may provide group identifier information (i.e. an Application-layer V2X Group identifier) as specified in clause 5.6.1.3.
The V2X application layer may provide V2X Application Requirements for this communication.
If the V2X application layer does not provide V2X Application Requirements, the V2X layer determines the PC5 QoS parameters based on the mapping of V2X service type to PC5 QoS parameters as defined in clause 5.1.2.1.
The V2X application layer may provide a group size and a member ID as specified in clause 5.2.1.3.
Step 3.
The V2X layer of transmitting UE determines the following for the groupcast mode communication transmission:
  • a source Layer-2 ID and a destination Layer-2 ID as specified in clauses 5.6.1.1 and 5.6.1.3;
  • the PC5 QoS parameters for this groupcast mode communication as specified in clauses 5.4.1.1 and 5.4.1.3;
  • the NR Tx Profile based on the configuration as specified in clause 5.1.2.1;
  • the NR eTx Profile based on the configuration as specified in clause 5.1.2.1; and
  • the radio frequency information based on the configuration as specified in clause 5.1.2.1.
The source Layer-2 ID, destination Layer-2 ID, the NR Tx Profile and the PC5 QoS parameters are passed down to the AS layer of transmitting UE for the groupcast mode communication transmission. When there is no NR Tx Profile available to be mapped for this groupcast V2X service, the V2X layer does not provide NR Tx Profile to the AS layer. When there are the other V2X service type(s) that use the same destination Layer-2 ID with this groupcast V2X service, the V2X layer determines whether and how to provide the NR Tx Profile to the AS layer as specified in clause 5.9.
The NR eTx Profile if available and the radio frequency information per PC5 QoS Flow for this groupcast V2X service are also passed down to the AS layer of transmitting UE for the transmission as specified in clause 5.11.
The V2X layer of receiving UE(s) determines the following for the groupcast mode communication reception:
  • the destination Layer-2 ID, as specified in clauses 5.6.1.1 and 5.6.1.3;
  • the PC5 QoS parameters for this groupcast mode communication as specified in clause 5.4.1.1;
  • the NR Tx Profile based on the configuration as specified in clause 5.1.2.1; and
  • the radio frequency information based on the configuration as specified in clause 5.1.2.1.
The destination Layer-2 ID, the NR Tx Profile and the PC5 QoS parameters are passed down to the AS layer of receiving UE(s) for the groupcast mode communication reception. When there is no NR Tx Profile available to be mapped for this groupcast V2X service, the V2X layer does not provide NR Tx Profile to the AS layer. When there are the other V2X service type(s) that use the same destination Layer-2 ID with this groupcast V2X service, the V2X layer determines whether and how to provide the NR Tx Profile to the AS layer as specified in clause 5.9.
The radio frequency information for this groupcast V2X service is also passed down to the AS layer of receiving UE(s) for the reception.
If the group size and the member ID for Application Layer managed group are provided by the V2X application layer, the V2X layer passes them to the AS layer as described in clause 5.2.1.3.
The AS layer of transmitting UE and the AS layer of receiving UE(s) determine the PC5 DRX parameter values as specified in clause 5.9.
Step 4.
Transmitting UE has a V2X service associated with this groupcast mode communication.
Transmitting UE sends the V2X service data using the source Layer-2 ID and the destination Layer-2 ID.
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