B.1 General Description

23.2853GPPArchitecture enhancements for V2X servicesRelease 17TS

In current MBMS system, the BM-SC, MBMS-GW and MME are located in the Core Network. The backhaul delay between the BM-SC and the eNB is non-negligible when calculating the end-to-end delay, especially when MBMS is used to delivery downlink V2X messages in the V2X system. To minimize the latency, possible deployment can consider the following options:

– To move the MBMS CN functions (e.g. BM-SC, MBMS-GW) closer to the eNB.

– To move the user plane of MBMS CN functions (BM-SC, MBMS-GW) closer to the eNB.

These options are illustrated in clause B.2 and clause B.3. The list of deployment options is not exhaustive and that they are shown for illustration purposes only.

If the V2X Application Server utilizes xMB interface, the options B.2 and B.3 replace MB2-C and MB2-U with xMB-C and xMB-U respectively.