Question: What is excluded from the average UL cell PDCP SDU bit-rate measurement?
Option 1: Successful transmissions of user plane traffic
Option 2: Control signalling and retransmissions
Option 3: PDCP SDUs received over the air interface in the cell during handover
Option 4: All types of packet switched traffic
Explanation: The average UL cell PDCP SDU bit-rate measurement excludes control signalling and retransmissions, as it only represents successful transmissions of user plane traffic.