Question: What is the purpose of the "UL PRB Usage" measurement in an Evolved Universal Terrestrial Radio Access Network (E-UTRAN)?
Option 1: To measure the downlink physical resource block usage for DTCH traffic.
Option 2: To calculate the total number of User Equipment (UE) connected to an eNodeB.
Option 3: To provide the percentage usage of uplink physical resource blocks (PRBs) for DTCH traffic, split into subcounters per E-RAB QoS level (QCI).
Option 4: To determine the number of Relay Nodes (RNs) served in a cell.
Explanation: The correct answer is Option 3 because the "UL PRB Usage" measurement is specifically designed to provide the usage percentage of uplink physical resource blocks (PRBs) for DTCH traffic, with separate counters maintained for each QCI. This allows for a detailed understanding of how uplink resources are being utilized across different Quality of Service (QoS) levels in an E-UTRAN network.