Question: What is the primary action taken by the User Equipment (UE) upon receiving a UDC checksum error notification via a PDCP control PDU in an E-UTRA network?
Option 1: The UE initiates a retransmission request for all pending packets.
Option 2: The UE temporarily suspends all data transmission to prevent further errors.
Option 3: The UE triggers a UDC buffer reset procedure to resynchronize the compression buffer.
Option 4: The UE automatically switches to a different radio bearer to bypass the error.
Explanation: Receiving a UDC checksum error notification indicates that the compression and de-compression buffers are out of sync. To correct this, resynchronizing these buffers is crucial for maintaining data integrity and flow. Triggering a UDC buffer reset procedure directly addresses the identified issue by re-establishing synchronization between the buffers, ensuring proper functioning of the compression and decompression processes in the UE.