Question: What happens when the LOCATION timer set by the Serving GPRS Support Node (SGSN) expires before receiving a location response from the Radio Access Network (RAN)?
Option 1: The SGSN sends a repeat request for location information to the RAN.
Option 2: The SGSN transitions to the PENDING state awaiting further instructions.
Option 3: The SGSN updates the User Equipment's (UE) location based on last known coordinates.
Option 4: The SGSN indicates a location failure to the original requesting entity and re-enters IDLE state.
Explanation: This is correct because, if the LOCATION timer expires before the SGSN receives the expected location response from the RAN, it triggers two specific actions: signaling a location failure to the entity that originally requested the location information and transitioning back to the IDLE state. This behavior ensures resource management and timely handling of unsuccessful location requests in the network.