Content for  TS 23.281  Word version:  19.4.0

The MCVideo adaption is used by an authorized MCVideo client to automatically change the video communication parameters including codec, resolution etc. according to the network conditions changes detected through such as packet loss or packet delay.

When an MCVideo user using a ProSe-enabled UE wants to communicate with a specific MCVideo group or MCVideo user using ProSe capabilities, the MCVideo client enables the use of the ProSe layer procedures for public safety, as specified in TS 23.303. For an off-network MCVideo group communication, the MCVideo client obtains configuration data such as the user info ID of the calling MCVideo user and the ProSe Group IP multicast address and ProSe Layer-2 Group ID associated to the target MCVideo group (as described in clause 8.1.3.2 of TS 23.280), and provides it to the ProSe layer. The ProSe Layer-2 Group ID of the target MCVideo group may be used by the ProSe layer as the target group info and the discovery group ID (defined in TS 23.303). Prior to initiating an off-network MCVideo group communication, a group member discovery procedure may be initiated to identify whether other members of the target MCVideo group are in the proximity of the calling MCVideo user, as described in the ProSe direct discovery for public safety use procedure in TS 23.303. The off-network MCVideo group communication using the ProSe capability is based on the one-to-many ProSe direct communication procedure for public safety use described in TS 23.303. For an off-network one-to-one MCVideo communication, the MCVideo client obtains configuration data such as the ProSe discovery group ID and user info ID of the target MCVideo user from the "List of user(s) who can be called in MCVideo private call" in the MCVideo user profile and requests the IP address of the MCVideo UE associated with the target MCVideo user from the ProSe layer. The MCVideo client enables the ProSe layer to determine the IP address for the communication with the target MCVideo UE by providing the ProSe discovery group ID and user info ID (as defined in TS 23.303) associated to the target MCVideo user. This may trigger the ProSe direct discovery for public safety use procedure to identify whether the target MCVideo user is in the proximity of the calling MCVideo user. The user info ID of the target MCVideo user is used by the ProSe layer as the target info (as defined in TS 23.303). The ProSe layer can then provide the IP address related to the target MCVideo user to the MCVideo client to initiate the off-network one-to-one MCVideo communication based on the one-to-one ProSe direct communication procedure described in TS 23.303.

The off-network MCVideo communication procedures using the ProSe capabilities are described within the corresponding clauses of each MCVideo capability, e.g. group communication procedures for off-network are described in clause 7.1.3 and private communication procedures for off-network are described in clause 7.2.3.