Question: What is the primary purpose of an SM-RL-MEMORY-AVAILABLE-Request without a parameter in the mobile radio interface for SMS support?
Option 1: To notify the network that the mobile's memory is full and cannot receive more short messages.
Option 2: To establish a dedicated channel for voice calls over the SMS infrastructure.
Option 3: To initiate the transfer of a notification to the network indicating the mobile has sufficient memory to receive one or more short messages.
Option 4: To request the network to delete previously sent short messages due to memory constraints on the mobile.
Explanation: The correct answer, Option 3, reflects the primary purpose of an SM-RL-MEMORY-AVAILABLE-Request without a parameter, as outlined in the context. This request triggers the process of notifying the network about the mobile's availability to receive short messages due to sufficient memory. This is crucial for efficient message delivery and management in wireless communication systems. The other options are incorrect because they either describe opposite scenarios (Option 1), unrelated functionalities (Option 2), or actions not associated with this specific request (Option 4).