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WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� Generally, the release of RABs or IU is initiated by the CN. However, in the following conditions, the RNC triggers the release.
Confidential Information of Huawei. No Spreading Without Permission
conditions, the RNC triggers the release.
� If RNC triggers IU release or RAB release ,and the cause is:
� User Inactivity
� Normal Release
� Successful Relocation
� Network Optimization
� UE Generated Signaling Connection Release
� In some abnormal cases, for example, when an AAL2 link over the Iu interface is abnormal, the RNC sends a RAB RELEASE REQUEST message to the CN to trigger the release of RABs. These kinds of RNC-Triggered RAB Release are taken as call drops.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� Call drop KPI should be calculated for CS and PS domain separately.
Confidential Information of Huawei. No Spreading Without Permission
� For analyze, there are call drop counters based on reasons, including RF reasons and Non-RF reasons.
� For CS domain, there are call drop counters for AMR service and video call service.
WCDMA RAN Call Drop KPI and Relative
Counters
� If the RNC has sent an IU RELEASE REQUEST message or a RAB RELEASE REQUEST message with the release cause of "Radio Connection With UE Lost" or
Confidential Information of Huawei. No Spreading Without Permission
REQUEST message with the release cause of "Radio Connection With UE Lost" or "Failure in the Radio Interface Procedure", RNC measures these by RF reason counters.
� After the RABs have been successfully set up, the RNC releases the related RABs if an exception occurs .These abnormal released RABs include all released RABs except the following causes: Normal Release, RF Failures . For example, the AAL2 link on the Iu interface becomes abnormal, RNC measures these by abnormal reason counters.
� After call drop , according to different services, RNC measures the counters for AMR services and video call services also.
� The counters for normal RAB release are used to calculate call drop rate.
WCDMA RAN Call Drop KPI and Relative
Counters
� Similar counters are defined for PS services based on release reason and Max bit rate.
Confidential Information of Huawei. No Spreading Without Permission
rate.
� Because of some specific UE, UE signaling trigged releases are not taken as call drop. That means “VS.RAB.Loss.PS.Abnorm.RNC” exclude UE signaling trigged releases .
WCDMA RAN Call Drop KPI and Relative
Counters
� After call drop , according to different services, RNC measures the counters for AMR services and video call services.
Confidential Information of Huawei. No Spreading Without Permission
services and video call services.
� Here , the RNC level “service normal releases” is the sum of the cell level counters.
WCDMA RAN Call Drop KPI and Relative
Counters
� RNC level AMR call drop rate:
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� RNC level VP call drop rate:
AMRs.CS.Norm.VS.RAB.Los NCs.CS.AMR.RVS.RAB.Los
NCs.CS.AMR.RVS.RAB.Los
∑+
RB.64l.CS.Conv.VS.Norm.Re 4K.RNCs.CS.Conv6VS.RAB.Los
4K.RNCs.CS.Conv6VS.RAB.Los
∑+
WCDMA RAN Call Drop KPI and Relative
Counters
� For PS domain, there are call drop counters for services with different typical rates.
Confidential Information of Huawei. No Spreading Without Permission
� For analyze, same as the CS counters ,there are call drop counters based on reasons, include RF reasons and Non-RF reasons.
WCDMA RAN Call Drop KPI and Relative
Counters
� Similar counters are defined for PS services based on release reason .
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� Similar counters are defined for PS services based on release reason and Max bit rate.
Confidential Information of Huawei. No Spreading Without Permission
rate.
� Because of some specific UE, UE signaling trigged releases are not taken as call drop. That means “VS.RAB.Loss.PS.Abnorm.RNC” exclude UE signaling trigged releases .
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� After a call drop, according to the call drop reason, RNC measure these counters in the best cell.
Confidential Information of Huawei. No Spreading Without Permission
the best cell.
� The call drop reasons include RF reasons , abnormal reasons.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� RF call drop may be caused by several reasons:
RLC layer reset
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� RLC layer reset
� Physical layer Uplink Synchronization Fail
� Failure in the Radio Interface Procedure
� Based on these reasons, three counters are defined.
WCDMA RAN Call Drop KPI and Relative
Counters
� Cause of "O&M Intervention“: by LMT, any user or service can be released manually.
Confidential Information of Huawei. No Spreading Without Permission
� Cause of "RAB pre-empted“ and “CELL Congestion” are related to load control algorithm.
� Cause of “Iu Interface AAL2 Link Failure” is related to the Iu transmission.
WCDMA RAN Call Drop KPI and Relative
Counters
� After a call drop, according to the call drop reason, RNC measure these counters in the best cell.
Confidential Information of Huawei. No Spreading Without Permission
the best cell.
� The call drop reasons include RF reasons , abnormal reasons.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� RF call drop can be caused by several reasons:
Confidential Information of Huawei. No Spreading Without Permission
� RLC layer reset
� Physical layer Uplink Synchronization Fail
� RRC layer procedure failure
� Based on these reasons, three counters are defined.
� Because of PS traffic and signaling are configured with RLC AM ,so “RLC reset” for PS include SRB reset and TRB reset, measured by “VS.RAB.Loss.PS.SRBReset” and “VS.RAB.Loss.PS.TRBReset”.
WCDMA RAN Call Drop KPI and Relative
Counters
� The counters for abnormal failures are similar with the CS counters.
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� Missing neighbors may cause RF call drops.
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
� If the RAB is set up for the HSDPA service, the RNC measures the items in the HSDPA cell that the UE camps on after HSDPA call drop.
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HSDPA cell that the UE camps on after HSDPA call drop.
� The call drop reasons could be RF or abnormal (Non-RF) reasons.
� Because of some specific UE, UE signaling trigged releases are not taken as call drops, these releases are included in “VS.HSDPA.RAB.Loss.Norm”
WCDMA RAN Call Drop KPI and Relative
Counters
� “VS.HSUPA.RAB.Loss.Abnorm” , this measurement item takes statistics of the number of all HSUPA RABs abnormally released by the RNC in a cell.
Confidential Information of Huawei. No Spreading Without Permission
number of all HSUPA RABs abnormally released by the RNC in a cell.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission