Question: What action does a User Equipment (UE) take when the DataInactivityTimer expires while in Radio Resource Control (RRC) CONNECTED state, according to 3GPP specifications?
Option 1: The UE initiates a new RRC connection request to maintain connectivity.
Option 2: The UE transitions to RRC_INACTIVE state and notifies the network of reduced activity.
Option 3: The UE performs actions to transition to RRC_IDLE state, logging the reason as 'RRC connection failure'.
Option 4: The UE restarts the DataInactivityTimer to extend its connected state duration.
Explanation: Upon expiry of the DataInactivityTimer in the RRC_CONNECTED state, the UE takes steps to move into a more power-efficient state due to inactivity. This involves transitioning to the RRC_IDLE state, citing 'RRC connection failure' as the release cause, ensuring efficient resource management and adherence to protocol specifications for handling inactivity periods.