Question: In GPRS, how is the MS Classmark handled to support efficient radio interface usage, particularly in terms of storage and transmission?
Option 1: The MS Classmark is transmitted repeatedly over the radio interface in both MM and Iu mode RRC messages.
Option 2: The MS Classmark is sent only once during initial attachment and not stored in the network for later use.
Option 3: The MS Classmark handling is identical for both SGSN-based and MSC-based services to maintain simplicity.
Option 4: The MS Classmark information is sent in MM and Iu mode RRC messages, then stored in the network as long as the MS is attached, minimizing redundant retransmissions.
Explanation: This approach, known as the "idle-mode Classmark" principle, optimizes radio interface usage by avoiding unnecessary repeated transmissions of the MS Classmark. By storing this information in the network while the MS is attached, the system reduces overhead and enhances efficiency, which is crucial for effective resource management in GPRS networks.