Load-based Inter-RAT Handover

1048698 The handover procedure is divided into four phases handover triggering handovermeasurement handover decision and handover execution1048698 In the triggering phase When the load of the UMTS cell that the UE accesses is higher than the related threshold the Load Reshuffling (LDR) algorithm makes a handover decision1048698 In the measurement phase The RNC enables the compressed mode and starts the inter-RAT handover measurement Inter-RAT handover due to load only support event-triggermeasurement report (ie 3C event)1048698 In the decision phase After the UE reports event 3C the RNC makes a handover decision1048698 In the execution phase The RNC initiates a handover procedure1048698 Based on the service ARP Traffic class Channel type (R99 HSDPA) RNC will choose the users with lower priority to execute handover

1048698 3C Event1048698 Event 3C is triggered on the basis of the following formula

M + CIO ge T + H

1048698 MOtherRAT is the measurement value of the cell (in another RAT) in the reporting range1048698 CIOOtherRAT is the cell individual offset value of the cell (in another RAT) in the reporting range which is equal to the sum of Cell oriented Cell Individual Offset and Neighboring cell oriented CIO1048698 TOtherRAT is the absolute inter-RAT handover threshold Based on the service type (CS PS service) this threshold can be configured through the following parameters1048698 Inter-RAT CS handover decision THD1048698 Inter-RAT PS handover decision THD1048698 H3C is 3C hysteresis the hysteresis value of event 3C1048698 For the PS and CS combined services the threshold(s) for CS services is (are) used1048698 When the conditions for event 3C are met and the delay requirement specified by the 3C event trigger delay time parameter can be satisfied the UE sends the measurement report of event 3C

Decision and Execution ProcedureDecision1048698 3C Event1048698 Load information interchanging between the 3G and 2G cellExecution

IP Port = 127001 5000DB = cmedbUSER = sa PWD = emsems

Parameters of Inter-RAT Handover1048698 The parameters for load-based inter-RAT handover

1048711 Inter-RAT CS handover decision THD1048711 Inter-RAT R99 PS handover decision THD1048711 3C hysteresis1048711 3C event trigger delay time1048711 Send Load Info to GSM Ind1048711 NCOV Reloc Ind based on GSM cell load1048711 CS domain Reloc GSM load THD1048711 PS domain Reloc GSM load THD

Load-based Inter-RAT Handover1048711 Decision and Execution Procedure1048711 Decision1048698 3C Event1048698 Load information interchanging between the 3G and 2G cell1048711 Execution

1048711 Inter-RAT CS handover decision THD1048711 Inter-RAT R99 PS handover decision THD1048711 3C hysteresis1048711 3C event trigger delay time1048711 Send Load Info to GSM Ind1048711 NCOV Reloc Ind based on GSM cell load1048711 CS domain Reloc GSM load THD1048711 PS domain Reloc GSM load THD

Load-based Inter-RAT Handover1048711 Decision and Execution Procedure1048711 Decision1048698 3C Event1048698 Load information interchanging between the 3G and 2G cell1048711 Execution