Question: Over the GC1 interface, what specific pieces of information are signalled by the GCS Application Server (GCS AS) to the User Equipment (UE) for enabling reception of GCS application data over appropriate MBMS Bearer(s)?
Option 1: Only TMGI associated with the MBMS bearer
Option 2: Multicast IP address and UDP port exclusively
Option 3: Source IP address alone, as it suffices for connection establishment
Option 4: TMGI, multicast IP address, UDP port, and source IP address collectively
Explanation: For the UE to successfully receive GCS application data over the appropriate MBMS Bearer(s), comprehensive signalling is required. This includes the Temporary Mobile Group Identity (TMGI) for bearer identification, multicast IP address for group targeting, UDP port for service differentiation, and source IP address for packet routing. Collectively, these elements ensure accurate and efficient data delivery, highlighting the importance of detailed signalling in telecom networks for services like MBMS.