Section: 4.3.2.1.2 Successful outgoing inter-RAT handovers per handover cause
Content: This measurement provides the number of successful outgoing inter-RAT handovers per cause target cell specific. CC. Receipt of a S1AP message UE CONTEXT RELEASE COMMAND sent from the MME/DeNB to the source eNB, indicating a successful IRAT handover (see TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [9]). Each UE CONTEXT RELEASE COMMAND message received is added to the relevant per handover cause measurement, the possible causes are included in TS 36.413[ Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP) ]  [9]. The sum of all supported per cause measurements shall equal the total number of outgoing inter-RAT handover events. In case only a subset of per cause measurements is supported, a sum subcounter will be provided first. All IRAT handovers to the neighbouring cells in non-eUTRAN are measured. Each measurement is an integer value. The number of measurements is equal to the number of causes supported plus a possible sum value identified by the .sum suffix. HO.IartOutSucc.Cause where Cause indicating the cause for handover. EUtranCellFDD EUtranCellTDD GSMRelation UTRANRelation CDMA2000Relation Valid for packet switched traffic EPS