Question: In E-UTRAN, when a Reset procedure is already in progress and a RESET message is received from the peer entity on the same S1 interface for UE associations previously marked for reset, how should the receiving entity respond?
Option 1: Ignore the RESET message to avoid conflict with the ongoing procedure.
Option 2: Send an error message indicating a procedure clash.
Option 3: Respond with a RESET ACKNOWLEDGE message as per predefined protocol guidelines.
Option 4: Initiate a new Reset procedure combining all affected UE associations.
Explanation: In E-UTRAN, to maintain synchronization and ensure the reset process is properly acknowledged, the receiving entity must respond with a RESET ACKNOWLEDGE message when it receives a RESET message during an ongoing Reset procedure, confirming receipt and helping manage UE associations efficiently.