9.5 File Distribution

23.2863GPPApplication layer support for Vehicle-to-Everything (V2X) servicesFunctional architecture and information flowsRelease 18TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

9.5.1 General

The VAE capabilities provide support for file distribution to the V2X application specific layer. The VAE capabilities abstract the aspects like file chunking, QoE management, file delivery from the V2X application specific layer.

9.5.2 Use of MBMS "files" session type

The VAE server acts as a content provider and the VAE client acts as an MBMS client in the xMB reference model (subclause 4.1 in 3GPP TS 26.348 [11]).

The VAE server makes use of the xMB procedures from 3GPP TS 26.348 [11] to create MBMS sessions whose type is set to "files" and to request the delivery of files over these sessions. Before provisioning files to the BM‑SC, the VAE server prepares the file for distribution, which may include partition of large files into smaller files or encryption.

The VAE server is responsible for translating the parameters related to the V2X application triggering the file delivery into corresponding xMB parameters. Table 9.5.2-1 describes the mapping between the V2X parameters and the xMB API properties specified in 3GPP TS 26.348 [11].

Table 9.5.2-1: Mapping between V2X parameters and xMB APIs

V2X parameter	Corresponding xMB API property
File transfer session indicator	Session Type: Files
List of files to be sent by the VAE server and their locations	File List
Target geographical area for the V2X Ues	Geographical Area
Information about the V2X application (e.g., software update, HD map download)	Service Class
Maximum bitrate for the V2X application	Max Bitrate
Maximum delay for the V2X application	Max Delay
QoE metrics the VAE server is interested in receiving about the V2X application	QoE Reporting
Local MBMS information or local MBMS activation indication	Local MBMS information (NOTE)
NOTE: The local MBMS information as the xMB API property is defined in 3GPP TS 29.116 [22].

NOTE: The list of V2X parameters needed for file delivery is not exhaustive and can be updated based on the specific V2X application requirements.