Section: 20.2 MBMS session start / update/ stop
Content: The MBMS session start shall be used by the BM-SC to trigger the bearer resource establishment and announce the arrival of data for a MBMS bearer service (along with the attributes of the data to be delivered e.g. QoS, MBMS service area, or MBMS-Cell-List) to every MBMS GW that will deliver the MBMS bearer service. The MBMS session update shall be used by the BM-SC to trigger the update of MBMS session attributes in the affected MBMS GWs. The attributes that can be modified are the MBMS service area, the MBMS-Cell-List and the list of MBMS control plane nodes (MMEs, SGSNs). The MBMS session stop shall be used by the BM-SC to indicate the end of the data stream for an MBMS bearer service to every MBMS GW that has been delivering the MBMS bearer service.