Section: 4.4.3.1 Average DL PDCP SDU delay
Content: This measurement provides the average (arithmetic mean) PDCP SDU delay on the downlink. The measurement is split into subcounters per E-RAB QoS level (QCI). If there is one or more RNs served in a cell, for that cell the eNodeB performs each measurement separately for packets transmitted between the eNodeB and UEs and for packets transmitted between the E-UTRAN and RNs. The measurement is also applicable to RNs. DER (n=1) This measurement is obtained according to the definition in 3GPP TS 36.314[ Evolved Universal Terrestrial Radio Access  (E-UTRA); Layer 2 - Measurements ]  [11]. Each measurement is an integer value representing the mean delay in ms. The number of measurements is equal to the number of QCIs plus a possible sum value identified by the .sum suffix. The measurement name has the form DRB.PdcpSduDelayDl.QCI, which indicates the PDCP SDU delay between the eNodeB (or RN) and UE DRB.PdcpSduDelayDlRN.QCI, which indicates the PDCP SDU delay between the E-UTRAN and RN. where QCI identifies the E-RAB level quality of service class. EUtranCellFDD EUtranCellTDD Valid for packet switched traffic EPS