Question: What is the purpose of the "DL PRB Usage" measurement in an Evolved Universal Terrestrial Radio Access Network (E-UTRAN)?
Option 1: To measure the usage of physical resource blocks (PRBs) on the uplink for DTCH traffic.
Option 2: To provide the usage (in percentage) of physical resource blocks (PRBs) on the downlink for DTCH traffic, split into subcounters per E-RAB QoS level (QCI).
Option 3: To measure the number of User Equipment (UEs) connected to an eNodeB.
Option 4: To monitor the packet loss rate in a cell.
Explanation: The correct answer is Option 2 because the "DL PRB Usage" measurement provides the usage (in percentage) of physical resource blocks (PRBs) on the downlink for DTCH traffic, split into subcounters per E-RAB QoS level (QCI), as stated in the text. This measurement helps to monitor and manage the resource utilization in an E-UTRAN network.