Question: Upon receiving a PDCP status report for AM (Acknowledged Mode) Data Radio Bearers (DRBs), how does the transmitting PDCP entity treat a PDCP SDU with its corresponding bit set to '1' in the bitmap or with a COUNT value less than the FMC field value?
Option 1: The PDCP entity will buffer the SDU for potential retransmission.
Option 2: The PDCP entity will forward the SDU to the higher layer for processing.
Option 3: The PDCP entity considers the SDU as successfully delivered and discards it according to protocol guidelines for efficient resource management.
Option 4: The PDCP entity sends an acknowledgement for the SDU back to the receiver.
Explanation: When a PDCP status report indicates an SDU has been successfully delivered (via bitmap or COUNT value comparison with FMC field), the transmitting PDCP entity considers its transmission successful and discards it to free up resources, following protocol efficiency and reliability guidelines for AM DRBs.