Question: What is the primary characteristic of the UL-CCCH-Message class in terms of its transmission and size, as per Radio Resource Control (RRC) protocol specification?
Option 1: A set of variable-size RRC messages sent from the Network to the UE on the downlink CCCH logical channel.
Option 2: A set of 32-bits RRC messages that may be sent from the UE to the Network on the uplink CCCH logical channel.
Option 3: A set of signaling messages exclusively used for RRC connection reestablishment procedures.
Option 4: A set of 48-bits RRC messages that may be sent from the UE to the Network on the uplink CCCH logical channel.
Explanation: This question assesses understanding of the UL-CCCH-Message class's fundamental attributes. The correct answer, Option 4, accurately reflects the specified size (48-bits) and transmission direction (from UE to Network on the uplink CCCH logical channel) of UL-CCCH-Messages as defined in the RRC protocol specification. This is crucial for telecom networks as it ensures proper formatting and routing of control messages, impacting network efficiency and device connectivity.