6.3.3 MCVideo transmission control procedures at MCVideo call release

24.5813GPPMission Critical Video (MCVideo) media plane controlProtocol specificationRelease 18TS

When an MCVideo client leaves an MCVideo call and the MCVideo call remains ongoing with the other MCVideo clients, the transmission control server follows a two-step procedure.

Step 1 The MCVideo server stops sending transmission control messages and RTP media packets to the MCVideo client leaving the MCVideo call and .the MCVideo server discards transmission control messages and RTP media packets received from the MCVideo client leaving the MCVideo call.

Step 2 When the application and signalling plane has determined that the MCVideo call with this transmission participant has been released, the corresponding instance of the transmission control server state machine for ‘basic transmission control operation towards the transmission participant’ and ‘basic reception control operation towards the transmission participant’ is released.

When an MCVideo call is released, the transmission control server follows a two-step procedure.

Step 1 The MCVideo server stops sending transmission control messages and RTP media packets to all transmission participants in the MCVideo call.

Step 2 When the application and signalling plane has determined that the MCVideo call has been released, the corresponding instance of the transmission control server state machine for ‘general transmission control operation’ and ‘general reception control operation’ are also terminated, along with any ‘basic transmission control operation towards the transmission participant’ and any ‘basic reception control operation towards the transmission participant’ state machines for the transmission participants of this call.

The transmission control server state machine for general transmission control operation initiates the MCVideo call release depending on the release policy specified in 3GPP TS 24.281 [2].