Question: What should a GTP-C entity do when it decides not to process an incoming request message due to overload, if possible?
Option 1: Drop the request message without sending any response.
Option 2: Send a reject response message indicating temporary unavailability of resources and include Overload Control Information.
Option 3: Process the request message partially to avoid dropping it completely.
Option 4: Ignore the overload condition and continue processing incoming messages.
Explanation: When a GTP-C entity is overloaded, it should protect itself by rejecting messages it cannot handle. However, simply dropping the request message without sending any response can cause the source GTP-C entity to retransmit the request, increasing the overload further. Therefore, if possible, the overloaded GTP-C entity should send a reject response message indicating temporary unavailability of resources and may include Overload Control Information to inform the source about its current state.