Question: Upon successful paging procedure initiated by an SGsAP-SERVICE-REQUEST message, what action does the VLR take if the procedure is specifically for SMS, in addition to stopping Timer Ts5?
Option 1: The VLR immediately sends a confirmation to the UE (User Equipment) that the SMS has been successfully delivered.
Option 2: The VLR starts the delivery of the SMS message(s) according to the specified procedures.
Option 3: The VLR waits for further instructions from the MME (Mobility Management Entity) before proceeding with the SMS.
Option 4: The VLR returns an SGs AP-RELEASE-REQUEST message to the MME without delivering the SMS, as per triggered request type.
Explanation: According to standard telecom procedures for handling SMS messages within the context of a successful paging procedure, the VLR's role is to facilitate the delivery of the SMS once the UE is successfully paged. Starting the delivery of the SMS message(s) aligns with the typical workflow for handling SMS Indicator-triggered paging procedures in mobile networks, ensuring that messages are efficiently delivered to the intended recipient upon their device becoming reachable.