Question: What is the primary purpose of a STATUS PDU in an Acknowledged Mode (AM) Radio Link Control (RLC) entity?
Option 1: To request retransmission of RLC data PDUs from the peer entity.
Option 2: To establish a new logical channel between the UE and the eNodeB.
Option 3: To inform the peer AM RLC entity about successfully received and lost RLC data PDUs.
Option 4: To signal congestion in the uplink or downlink direction.
Explanation: In Acknowledged Mode (AM) of the Radio Link Control (RLC) protocol, reliability is ensured through acknowledgments and retransmissions. The STATUS PDU allows the receiving end to report back to its peer about the status of received RLC data PDUs, identifying which are successfully received and which are lost, facilitating efficient retransmission and maintaining sequence integrity for reliable data transfer in wireless communications.