Question: What is represented by the maximum cell bit-rate of PDCP SDUs on the downlink in an E-UTRAN network?
Option 1: The minimum egress rate of user plane traffic from the eNodeB/RN.
Option 2: The average ingress rate of control plane traffic to the eNodeB/RN.
Option 3: The maximum ingress rate of user plane traffic to the eNodeB/RN via X2 or S1.
Option 4: The total bit-rate of all QCIs in the network.
Explanation: This measurement represents the maximum ingress rate of user plane traffic to the eNodeB/RN via X2 or S1, which is essential for understanding the network's capacity and performance.