6 WCDMA RAN12 Call Drop KPI and Relative Counters ISSUE 1.01
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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
The scenario for “User inactivity”:
If a user with PS service has no data transmission after a certain timer expires
(this timer is set by RNC), RNC can send signaling IU RELEASE REQUEST
to CN to release the service. This is not considered as call drop.
The scenario for “UE generated signaling connection release”
Some type of UE can release signaling connection automatically be sending
signaling SIGNALLING CONNECTION RELEASE INDICATION to RNC, then
RNC will send signaling IU RELEASE REQUEST to CN to release the service.
This is not considered as call drop neither.
WCDMA RAN Call Drop KPI and Relative
Counters
P-4Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
P-5Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
P-6Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
CDR: call drop ratio
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
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
VP: video phone
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
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
Confidential Information of Huawei. No Spreading Without Permission
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
Why
VS.HSDPA.H2D.Succ+VS.HSDPA.H2F.Succ+VS.HSDPA.HHO.H2D.SuccOutIntra
Freq+VS.HSDPA.HHO.H2D.SuccOutInterFreq is added in the denominator to
calculate the HSDPA service drop ratio?
If one user switch from HS-DSCH to other channel types due to some reason
(mobility e.g.), it should be consider as a normal HS-DSCH release (refer to
second item in Notes).
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
VS.HSDPA.RAB.AbnormRel
Number of HSDPA RABs abnormal released for cell
VS.HSDPA.RAB.NormRel
Number of HSDPA RABs normal released for cell
VS.HSDPA.H2D.Succ
Number of successful handovers from HS-DSCH to DCH for cell
VS.HSDPA.H2F.Succ
Number of successful handovers from HS-DSCH to CCH for cell
VS.HSDPA.HHO.H2D.SuccOutIntraFreq
Number of successful Intra-Frequency H2D hard handovers for cell
VS.HSDPA.HHO.H2D.SuccOutInterFreq
Number of successful Inter-Frequency H2D hard handovers for cell
UE RNC
RB Reconfiguration
RB Reconfiguration Complete
Counter VS.HSDPA.H2D.Succ /
VS.HSDPA.H2F.Succ /
VS.HSDPA.HHO.H2D.SuccOutIntraFreq /
S.HSDPA.HHO.H2D.SuccOutInterFreq is added by
1 in the corresponding scenarios.
· Cpounter VS.HSDPA.H2D.Succ / VS.HSDPA.H2F.Succ is triggered in H2D / H2F channel switch.
· Counter VS.HSDPA.HHO.H2D.SuccOutIntraFreq / S.HSDPA.HHO.H2D.SuccOutInterFreq is triggered in H2D
inter-frequencty / intra-frequency hard handover.
· H2D / H2F Channel switch and H2D hard handover are both completed by RB Reconfiguration procedure.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
Why
VS.HSUPA.E2D.Succ+VS.HSUPA.E2F.Succ+VS.HSUPA.HHO.E2D.SuccOutIntra
Freq+VS.HSUPA.HHO.E2D.SuccOutInterFreq is added in the denominator to
calculate the HSUPA service drop ratio?
If one user switch from E-DCH to other channel types due to some reason
(mobility e.g.), it should be consider as a normal E-DCH release (refer to
second item in Notes).
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
VS.HSUPA.RAB.AbnormRel
Number of HSUPA RABs abnormal released for cell
VS.HSUPA.RAB.NormRel
Number of HSUPA RABs normal released for cell
VS.HSUPA.E2D.Succ
Number of successful handovers from E-DCH to DCH for cell
VS.HSUPA.E2F.Succ
Number of successful handovers from E-DCH to CCH for cell
VS.HSUPA.HHO.E2D.SuccOutIntraFreq
Number of successful Intra-Frequency E2D hard handovers for cell
VS.HSUPA.HHO.E2D.SuccOutInterFreq
Number of successful Inter-Frequency E2D hard handovers for cell
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
If the call drop ratio is high, we need to find the reason. Some counters can indicate
the reason of call drop.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
Normally RF (radio frequency) problem is the main reason of call drop in real network
such as bad coverage or handover failure.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
VS.RAB.AbnormRel.CS.IuAAL2
Number of CS RABs Abnormally Released for Cell Due to Iu Interface AAL2 Link
Failure
This counter is triggered when RNC finds the AAL2 path is abnormal. Maybe it is the
problem of Iu-CS transmission.
VS.RAB.AbnormRel.CS.RF
Number of CS RABs Abnormally Released Due to RF for Cell
Some RF problems will trigger this counter such as bad coverage, handover failure,
interference and etc. Normally RF problem is the main reason of call drop in real
network.
VS.RAB.AbnormRel.CS.OM
Number of CS RAB Release Requests for Cell Due to O&M Intervention
If RAB is release by O&M intervention (For example RAB is released by MML
command), this counter will be triggered. Normally this is not the main reason of call
drop in real network.
VS.RAB.AbnormRel.CS.Preempt
Number of CS RAB Release Attempts for Cell Due to RAB Preemption
During access control procedure if system resource is limited and preemption function
is enabled, a user with higher priority can preempt a user with lower priority. Then this
counter will be triggered.
VS.RAB.AbnormRel.CS.UTRANgen
Number of CS RAB Abnormal Releases Triggered by RNC for Cell Due to UTRAN
Cause
If RAB is released because of UTRAN problem, this counter will be triggered. If this
counter has high value, more detailed information need to be collected and analyzed.
VS.RAB.AbnormRel.CS.OLC
Number of CS Domain RABs Released Due to Congestion for Cell
If the system load is very high and over load control function is enabled, RNC can
release some RAB to reduce the load. Then this counter will be triggered.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
Normally RF problem is the main reason of call drop. More sub counters can be used
to analyze the detailed RF reason of call drop. To find the exact reason maybe more
detailed information such as drive test result and signaling trace result need to be
collected.
VS.RAB.AbnormRel.CS.RF.ULSync
If NodeB loses the UL synchronization of the UE during service, the RAB will
be released and this counter will be triggered. Bad coverage or missing
neighboring cell configuration can triggered this counter.
VS.RAB.AbnormRel.CS.RF.UuNoReply
If UE can not respond to the signaling from RNC during service, the RAB will
be release and this counter will be triggered. Bad coverage can trigger this
counter.
VS.RAB.AbnormRel.CS.RF.SRBReset
If RNC sends signaling to UE repeat but UE can not send a ACK response,
RNC will reset RLC layer. Then call drop will happen and this counter will be
triggered. Bad coverage or interference can trigger this counter.
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
VS.RAB.AbnormRel.PS.GTUPLoss
Number of PS RABs Abnormally Released for Cell Due to GTPU Failure
This counter is triggered when RNC finds the GTPU in Iu-PS user plane is
abnormal. Maybe it is the problem of Iu-PS transmission.
VS.RAB.AbnormRel.PS.RF
Number of PS RABs Abnormally Released Due to RF for Cell
Some RF problems will trigger this counter such as bad coverage, handover
failure, interference and etc. Normally RF problem is the main reason of call
drop in real network.
VS.RAB.AbnormRel.PS.OM
Number of PS RAB Release Requests for Cell Due to O&M Intervention
If RAB is release by O&M intervention (For example RAB is released by MML
command), this counter will be triggered. Normally this is not the main reason
of call drop in real network.
VS.RAB.AbnormRel.PS.Preempt
Number of PS RAB Release Attempts for Cell Due to RAB Preemption
During access control procedure if system resource is limited and preemption
function is enabled, a user with higher priority can preempt a user with lower
priority. Then this counter will be triggered.
VS.RAB.AbnormRel.PS.OLC
Number of PS Domain RABs Released Due to Congestion for Cell
If the system load is very high and over load control function is enabled, RNC
can release some RAB to reduce the load. Then this counter will be triggered.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
Normally RF problem is the main reason of call drop. More sub counters can be used
to analyze the detailed RF reason of call drop. To find the exact reason maybe more
detailed information such as drive test result and signaling trace result need to be
collected.
VS.RAB.AbnormRel.PS.RF.ULSync
If NodeB loses the UL synchronization of the UE during service, the RAB will
be released and this counter will be triggered. Bad coverage or missing
neighboring cell configuration can triggered this counter.
VS.RAB.AbnormRel.PS.RF.UuNoReply
If UE can not respond to the signaling from RNC during service, the RAB will
be release and this counter will be triggered. Bad coverage can trigger this
counter.
VS.RAB.AbnormRel.PS.RF.SRBReset
If RNC sends signaling to UE repeat but UE can not send a ACK response,
RNC will reset RLC layer. Then call drop will happen and this counter will be
triggered. Bad coverage or interference can trigger this counter.
VS.RAB.AbnormRel.PS.RF.TRBReset
If RNC sends PS data to UE repeat but UE can not send a ACK response,
RNC will reset RLC layer. Then call drop will happen and this counter will be
triggered. Bad coverage or interference can trigger this counter.
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
The table shows the result of CS call drop of Top 10 cells in one day. It is from a real
network.
In the example we can see that most of the CS call drops in the network are caused
by RF problems.
WCDMA RAN Call Drop KPI and Relative
Counters
Confidential Information of Huawei. No Spreading Without Permission
The table shows the result of PS call drop of Top 10 cells in one day. It is from a real
network.
In the example we can see that most of the PS call drops in the network are caused
by RF problems.
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
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