Question: In a network supporting talker priorities or uplink access option, what is the purpose of the BSS repeating the uplink busy message on the FACCH of the voice group call channel downlink at regular intervals?
Option 1: To synchronize UE handovers in Voice Group Call Service (VGCS)
Option 2: To inform UEs (User Equipment) of uplink access restrictions, preventing simultaneous transmissions
Option 3: To initiate a voice group call channel setup for incoming calls
Option 4: To perform load balancing across different BSS (Base Station Subsystem) in the network
Explanation: The repetition of the uplink busy message at regular intervals is crucial for managing uplink access, especially with talker priorities or specific uplink access options. This ensures UEs are continually informed about the current uplink status, preventing potential collisions or unauthorized transmissions, thus maintaining orderly communication within the voice group call.