Question: Where is the Transmission Control Server (TCS) functional entity typically located during off-network Mission Critical Video (MCVideo) operation?
Option 1: Within the Radio Access Network (RAN) infrastructure
Option 2: At a central location in the Mobile Core Network
Option 3: In an external server, separate from both UE and MCVideo Server
Option 4: Within the User Equipment (UE)
Explanation: According to the functional architecture for Mission Critical Video, during off-network operations, the Transmission Control Server's functionality is embedded within the User Equipment (UE) itself. This allows for distributed transmission control when the UE is not connected to the network, enabling continued support for MCVideo communications under such conditions.