Section: 4.3.2.1.1 Attempted outgoing inter-RAT handovers per handover cause
Content: This measurement provides the number of attempted outgoing inter-RAT handovers per cause and target cell specific. CC. Transmission of the MobilityFromEUTRACommand message or the HandoverFromEUTRAPreparationRequest message from the serving eNB/RN to the UE indicating the attempt of an outgoing handover from EUTRAN to UTRAN or to GERAN or to CDMA2000 (see TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [8]). Each MobilityFromEUTRACommand message or HandoverFromEUTRAPreparationRequest message transmitted 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 networks 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.IartOutAtt.Cause where Cause identifies the cause for handover EUtranCellFDD EUtranCellTDD GSMRelation UTRANRelation CDMA2000Relation Valid for packet switched traffic EPS