Question: What is the primary purpose of the eNodeB Control Plane Relocation Indication procedure in intra-NB-IoT mobility for UE and MME using Control Plane CIoT EPS Optimisation?
Option 1: To request the MME to release the UE's existing S1 connection.
Option 2: To request the MME to authenticate the UE's re-establishment request and initiate the establishment of the UE's S1 connection and, if necessary, the S11-U connection.
Option 3: To notify the MME that the UE has initiated a RRC Re-establishment procedure in a new eNodeB.
Option 4: To inform the MME that the UE is no longer reachable.
Explanation: The primary purpose of the eNodeB Control Plane Relocation Indication procedure is to request the MME to authenticate the UE's re-establishment request and initiate the establishment of the UE's S1 connection and, if necessary, the S11-U connection after the UE has initiated a RRC Re-establishment procedure in a new eNodeB. This ensures that the UE can maintain its connectivity and continue to receive services from the network.