Content for TS 23.287 Word version: 18.4.0

1… 4… 4.2.1.2… 4.2.2… 4.3… 5… 5.2… 5.3… 5.4… 5.4.2… 5.5 5.6… 5.7… 5.10… 6… 6.2… 6.3… 6.3.3… 6.4… 6.5… A…

6.4 Procedures for V2X communication over Uu reference point 6.4.1 Procedure for notification on QoS Sustainability Analytics to the V2X Application Server 6.4.2 V2X Application Server discovery using broadcast MBS session 6.4.3 Procedure for V2X communication with MBS
...

6.4 Procedures for V2X communication over Uu reference point p. 55

6.4.1 Procedure for notification on QoS Sustainability Analytics to the V2X Application Server p. 55

Figure 6.4.1-1 depicts a procedure for notification on QoS Sustainability Analytics to the V2X Application Server.

Reproduction of 3GPP TS 23.287, Fig. 6.4.1-1: Notification on QoS Sustainability Analytics to the V2X Application Server

Figure 6.4.1-1: Notification on QoS Sustainability Analytics to the V2X Application Server

Step 1.

The V2X Application Sever derives information on V2X service, location information (an area or path of interest), QoS requirements and reporting threshold(s). The location information can be in the form of geographic coordinates to reflect a list of waypoints.

Step 2.

The V2X Application Server subscribes to or requests notification on QoS Sustainability Analytics provided by NWDAF via NEF by invoking Nnef_AnalyticsExposure_Subscribe service operation as defined in clause 6.1.1.2 of TS 23.288 or Nnef_AnalyticsExposure_Fetch service operation as defined in clause 6.1.2.2 of TS 23.288. The parameters included in the request are described in clause 5.4.5.2.2.

The V2X Application Server may include multiple sets of parameters in order to provide different combinations of "Location information" and "Analytics Target Period" when requesting notification on QoS Sustainability Analytics.

Step 3.

When the NEF receives the request from the V2X Application Server, the NEF interacts with the NWDAF as described in the procedure in clause 6.9.4 of TS 23.288. The NEF shall map the QoS Characteristics attributes including Resource Type, PDB and PER received from the V2X Application Server to the most appropriate 5QI that is supported by the network if the V2X application server does not provide 5QI. If 5QI is provided by the V2X Application Server, NEF does not perform such mapping. The NEF may map other parameters included in the request from the V2X Application Server to information used by the 3GPP system.

Step 4.

If the NEF receives the response from the NWDAF, the NEF notifies the V2X Application Server with the analytics information on QoS Sustainability Analytics by invoking Nnef_AnalyticsExposure_Notify service operation for a Subscribe-Notify model as defined in clause 6.1.1.2 of TS 23.288 or Nnef_AnalyticsExposure_Fetch service operation for a Request-Response model as defined in clause 6.1.2.2 of TS 23.288.

Step 5.

V2X application adjustment may take place.

For a Subscribe-Notify model, when the V2X Application Sever wants to cancel subscription to analytics information, it invokes the Nnef_AnalyticsExposure_Unsubscribe service operation as defined in clause 6.1.1.2 of TS 23.288.

6.4.2 V2X Application Server discovery using broadcast MBS session |R18| p. 57

Figure 6.4.2-1 shows the procedure for receiving V2X Application Server information via broadcast MBS session. This procedure is applicable for local V2X Application Server discovery if supported by the network. It may be used by the UE only when it is configured with the information to receive V2X Application Server information via MBS as specified in clause 5.1.3.1.

Reproduction of 3GPP TS 23.287, Fig. 6.4.2-1: V2X Application Server discovery using broadcast

Figure 6.4.2-1: V2X Application Server discovery using broadcast

Step 1.

When a UE desires V2X communication over Uu reference point for establishing the connection with V2X Application Server, it registers to the home PLMN if it has not done so.

Step 2.

If the UE has configuration for receiving V2X Application Server information via MBS as specified in clause 5.1.3.1, it receives the local Service Information from the corresponding broadcast traffic channel. The local Service Information includes the address information of the local V2X Application Servers, e.g. the FQDNs of the servers. In addition, the local Service Information may include the MBS session announcement for the corresponding V2X Application Servers, if MBS is to be used to receive V2X messages.

Step 3.

Based on the information received from step 2, the UE may obtain the local V2X Application Server address, e.g. via a query of the DNS with the received FQDN.

Step 4.

The UE may establish connection with the V2X Application Server for the service, e.g. obtaining the MBS session announcement for V2X if it is not provided in step 2 to allow the UE to receive V2X messages over MBS.

6.4.3 Procedure for V2X communication with MBS |R18| p. 57

6.4.3.1 MBS service area mapping p. 57

MBS service areas for V2X services may be configured at the V2X Application Server. Such service areas are not expected to change frequently. Alternatively, the V2X Application Server may obtain the UE location information and determine the MBS service area. The V2X Application Server performs the following procedures for managing the MBS sessions:

MBS session related procedures specified in TS 23.247 are used for managing MBS sessions.
The V2X Application Server derives MBS service area information (i.e. Cell ID list and/or TAI list, or geographical area information) of the target MBS service area for such MBS session related procedures.
The V2X Application Server may use the UE location information obtained as below for the determination of the target MBS service area to deliver V2X messages.
- The UE may provide its geographic location or Cell ID information over V1 reference point to the V2X Application Server.
- A UE may include its geographic location information in the V2X message, e.g. as defined in ETSI ITS (ETSI TS 102 637-2 [31], ETSI TS 102 637-3 [32]) or other ITS specifications.
- A UE may provide its geographic location information in the V2X message and Cell ID information in the signalling to the V2X Application Server.
From such MBS session related procedures, the V2X Application Server knows which MBS session(s) are serving the target MBS service area. Hence, the V2X Application Server forwards a V2X message to the appropriate MBS session(s).
The V2X Application Server can apply a location dependent MBS service as defined in clause 6.2 of TS 23.247 for the distribution of different content data to different MBS service areas in such a manner that the areas are transparent to receiving UEs and the received content of a UE is determined by its location.