OWO207030 WCDMA RAN15 Call Drop KPI and Relative Counters ISSUE 1.00

www.huawei.com

Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved.

WCDMA RAN15 Call Drop KPI and Related Counters

Copyright © 2013 Huawei Technologies Co., Ltd. All rights reserved. Page3

Objectives Upon completion of this course, you will be able to:

Describe call drop counter system Know how to calculate call drop KPI


Contents1. Definition Of a Call Drop2. Typical Call Drop KPI and Related Counters3. Counters Indicating the Call Drop Reason


How to Define Call Drop? Normally CN will trigger release procedure after a

service is over. For release triggered by RNC, if the release reason is

one of the following, it is not defined as call drop. User inactivity UE generated signaling connection release

If RNC triggers release procedure but the reason is not one of the previous two, it is defined as call drop.

Page5


Procedure for Normal Release Two scenario for normal release:

Page6

CNRNC

IU Release Command

IU Release Complete

Scenario 1: CN triggers release.

CNRNC

IU Release Command

IU Release Complete

IU Release Request orRAB Release Request

Scenario 2: RNC triggers release but the reason is “user inactivity” or “UE generated signaling connection release”.


Procedure for Call Drop If RNC triggers release but the reason is not “user

inactivity” or “UE generated signaling connection release”, it is considered as call drop.

Page7

CNRNC

IU Release Command

IU Release Complete



Call Drop Ratio Call drop ratio in Statistic:

RNC KPIs (Average Value during N days)

All Service CDRCS AMR Call Drop Ratio [%] 0.48%

VP Call Drop Ratio [%] 0.92%PS Service Drop Ratio [%] 0.34%

HSDPA CDR HSDPA Service Drop Ratio 0.27%HSUPA CDR HSUPA Service Drop Ratio 0.29%

ReleaseIu or RAB ofNumber

drops Call ofNumber Ratio Drop Call




CS Service Drop Ratio This KPI can be used to evaluate the call drop ratio

of the CS service in an RNC or a cluster.KPI name CS Service Drop Ratio

Measurement Scope

CELL, RNC

Formula CS Service Drop Ratio=(Number of CS RAB Abnormal Release/Total number of CS RAB Release)*100%

Associated Counters

CS Service Drop Ratio=[VS.RAB.AbnormRel.CS/(VS.RAB.AbnormRel.CS+VS.RAB.NormRel.CS)]*100%CS Service Drop Ratio (RNC) = [VS.RAB.AbnormRel.CS.RNC/(VS.RAB.AbnormRel.CS.RNC+ VS.RAB.NormRel.CS.RNC)]x 100%

Notes This KPI involves CS call drops due to authentication failure during PS security mode in the cell.


Related Counters VS.RAB.AbnormRel.CS (ID: 67179778)

Number of CS RABs abnormally released for cell VS.RAB.NormRel.CS (ID: 67179779)

Number of CS RABs normally released for cell VS.RAB.AbnormRel.CS.RNC (ID: 67174963)

Number of CS RABs abnormally released for RNC VS.RAB.NormRel.CS.RNC (ID: 67174965)

Number of CS RABs normally released for RNC


AMR Call Drop Ratio This KPI can be used to evaluate the call drop ratio

of the AMR service in an RNC or a cluster.KPI name AMR Call Drop Ratio

Measurement Scope

CELL

Formula AMR Call Drop Ratio=(Number of AMR RAB Abnormal Release/Total number AMR RAB Release)*100%

Associated Counters

AMR Call Drop Ratio (Cell) = [VS.RAB.AbnormRel.AMR/(VS.RAB.AbnormRel.AMR+ VS.RAB.NormRel.AMR)] x 100%AMR Call Drop Ratio (RNC) = [(Sum{VS.RAB.AbnormRel.AMR}+ Sum{VS.RAB.AbnormRel.AMR.Iur})/(Sum{VS.RAB.AbnormRel.AMR}+ Sum{VS.RAB.NormRel.AMR}+ Sum{VS.RAB.AbnormRel.AMR.Iur}+ Sum{VS.RAB.NormRel.AMR.Iur})] x 100%

Notes The RNC level KPIs is calculated by aggregating all the cell counters.


Related Counters VS.RAB.AbnormRel.AMR (ID: 67180082)

Number of CS AMR RABs abnormally released for cell VS.RAB.NormRel.AMR (ID: 67190518)

Number of CS AMR RABs normally released for cell(not including WB-AMR)

VS.RAB.AbnormRel.AMR.Iur(ID:67191859) Number of Abnormally Released AMR RABs on Iur Interface

for SRNC VS.RAB.NormRel.AMR.Iur(ID:67191858)

Number of Normally Released AMR RABs on Iur Interface for SRNC


VP Call Drop Ratio This KPI can be used to evaluate the call drop ratio

of the VP service in an RNC or a cluster.

KPI name VP Call Drop Ratio

Measurement Scope

CELL

Formula VP Call Drop Ratio=(Number of VP RAB Abnormal Release/Total number of VP RAB Release)*100%

Associated Counters

VP Call Drop Ratio=[VS.RAB.AbnormRel.CS64/(VS.RAB.AbnormRel.CS64+VS.RAB.NormRel.CS64)]*100%

Notes The RNC level KPIs is calculated by aggregating all the cell counters.


Related Counters VS.RAB.AbnormRel.CS64 (ID: 67180083)

Number of CS conversational 64kbit/s RABs abnormally released for cell

VS.RAB.NormRel.CS64 (ID: 67191786) Number of CS 64 kbit/s conversational RABs normally

released for cell


PS Service Drop Ratio (Cell) This KPI can be used to evaluate the call drop ratio

of all PS services in a cluster.KPI name PS Service Drop Ratio (Cell)

Measurement Scope

CELL

Formula PS Service Drop Ratio (Cell)=(Number of PS RAB Abnormal Release/Total number of PS RAB Release)*100%

Associated Counters

PS Service Drop Ratio=[VS.RAB.AbnormRel.PS/(VS.RAB.AbnormRel.PS+ VS.RAB.NormRel.PS)]*100%

Note This KPI involves PS connection failures due to authentication failure during CS security mode in the cell. You can subtract VS.RAB.AbnormRel.PS.Security from the numerator of the formula to decrease the value of this KPI.


Related Counters VS.RAB.AbnormRel.PS (ID: 67179781)

Number of PS RABs abnormally released for cell VS.RAB.NormRel.PS (ID: 67179782)

Number of PS RABs normally released for cell


PS Service Drop Ratio (RNC) This KPI can be used to evaluate the call drop ratio

of all PS services in an RNC.KPI name PS Service Drop Ratio (RNC)

Measurement Scope

RNC

Formula PS Service Drop Ratio (RNC)=( Number of PS RAB Abnormal Release/Total number of PS RAB Release)*100%

Associated Counters

PS Service Drop Ratio (RNC)=[VS.RAB.AbnormRel.PS.RNC/(VS.RAB.AbnormRel.PS.RNC+ VS.RAB.NormRel.PS.RNC)]*100%

Note This KPI involves PS connection failures due to authentication failure during CS security mode in the cell. You can subtract VS.RAB.AbnormRel.PS.Security from the numerator of the formula to decrease the value of this KPI.


Related Counters VS.RAB.AbnormRel.PS.RNC (ID: 67174964)

Number of PS RABs abnormally released for RNC VS.RAB.NormRel.PS.RNC (ID: 67174966)

Number of PS RABs normally released for RNC


PS R99 Service Drop Ratio (Cell) This KPI can be used to evaluate the call drop ratio

of all PS R99 services in a cluster.

KPI name PS R99 Service Drop Ratio

Measurement Scope

CELL

Formula PS R99 Service Drop Ratio=(Number of PS R99 RAB Abnormal Release/Total number of PS R99 RAB Release)*100%

Associated Counters

PS R99 Service Drop Ratio=[VS.RAB.AbnormRel.PSR99/(VS.RAB.AbnormRel.PSR99+ VS.RAB.NormRel.PSR99)]*100%


Related Counters VS.RAB.AbnormRel.PSR99 (ID: 73403806)

Number of PS R99 RABs abnormally released for cell(including RF failure)

VS.RAB.NormRel.PSR99 (ID: 73403807) Number of PS R99 RAB successfully released for cell


PS R99 Service Drop Ratio (RNC) This KPI can be used to evaluate the call drop ratio of

all PS R99 services in RNC level.KPI name PS R99 Service Drop Ratio

Measurement Scope

CELL

Formula PS R99 Service Drop Ratio = (Number of PS R99 RAB Abnormal Release/Total number of PS R99 RAB Release)*100%

Associated Counters

RNC level KPIs is calculated by aggregating all cell counters of following.PS R99 Call Drop Ratio (RNC)= [VS.RAB.AbnormRel.PSR99+(VS.RAB.AbnormRel.PS.Conv.Iur+VS.RAB.AbnormRel.PS.Str.Iur+VS.RAB.AbnormRel.PS.BE.Iur-VS.RAB.AbnormRel.HSDPA.Iur)]/[VS.RAB.AbnormRel.PSR99+VS.RAB.NormRel.PSR99+(VS.RAB.NormRel.PS.Conv.Iur+VS.RAB.NormRel.PS.Str.Iur+VS.RAB.NormRel.PS.BE.Iur-VS.RAB.NormRel.HSDPA.Iur)+(VS.RAB.AbnormRel.PS.Conv.Iur+VS.RAB.AbnormRel.PS.Str.Iur+VS.RAB.AbnormRel.PS.BE.Iur-VS.RAB.AbnormRel.HSDPA.Iur)]*100%


Related Counters VS.RAB.AbnormRel.PS.***.Iur (*** stand for

different service: conversational, streaming, BE and HSDPA)

Number of RABs Abnormally Released for PS Conv/ Str / BE /HSDPA Services on Iur Interface for SRNC.

VS.RAB.NormRel.PS .***.Iur Number of RABs normally Released for PS Conv/ Str /

BE /HSDPA Services on Iur Interface for SRNC


HSDPA Service Drop Ratio This KPI can be used to evaluate the call drop ratio

of the PS service carried by HSDPA in an RNC or a cluster.KPI name HSDPA Service Drop Ratio

Measurement Scope

CELL

Formula HSDPA Service Drop Ratio=(Number OF HSDPA_RAB Abnorma lRelease/Total number OF HSDPA_RABRelease)*100%

Associated Counters

HSDPA Service Drop Ratio=[(VS.HSDPA.RAB.AbnormRel)/(VS.HSDPA.RAB.AbnormRel+VS.HSDPA.RAB.NormRel+VS.HSDPA.H2D.Succ+VS.HSDPA.H2F.Succ+VS.HSDPA.HHO.H2D.SuccOutIntraFreq+VS.HSDPA.HHO.H2D.SuccOutInterFreq)]*100%

Notes 1. The RNC level KPIs is calculated by aggregating all the cell counters.

2. The successful channel transition is considered as normal HS-DSCH release ( including transitions due to mobility).


Related Counters VS.HSDPA.RAB.AbnormRel (ID: 67191162) VS.HSDPA.RAB.NormRel (ID: 67191164) VS.HSDPA.H2D.Succ (ID: 67189832) VS.HSDPA.H2F.Succ (ID: 67189833) VS.HSDPA.HHO.H2D.SuccOutIntraFreq (ID:

67191158) VS.HSDPA.HHO.H2D.SuccOutInterFreq (ID:

67191160)


HSUPA Service Drop Ratio This KPI can be used to evaluate the call drop ratio

of the PS service carried by HSUPA in an RNC or a cluster.KPI name HSUPA Service Drop Ratio

Measurement Scope

CELL

Formula HSUPA Service Drop Ratio=(Number of HSUPA_RAB Abnormal Release/Total number of HSUPA_RAB Release)*100%

Associated Counters

HSUPA Service Drop Ratio=[(VS.HSUPA.RAB.AbnormRel)/(VS.HSUPA.RAB.AbnormRel+VS.HSUPA.RAB.NormRel+VS.HSUPA.E2D.Succ+VS.HSUPA.E2F.Succ+VS.HSUPA.HHO.E2D.SuccOutIntraFreq+VS.HSUPA.HHO.E2D.SuccOutInterFreq)]*100%

Notes 1. The RNC level KPIs is calculated by aggregating all the cell counters.

2. The successful channel transition is considered as normal E-DCH release ( including transitions due to mobility).


Related Counters VS.HSUPA.RAB.AbnormRel (ID: 67192364) VS.HSUPA.RAB.NormRel (ID: 67192365) VS.HSUPA.E2D.Succ (ID: 67192470) VS.HSUPA.E2F.Succ (ID: 67192481) VS.HSUPA.HHO.E2D.SuccOutIntraFreq (ID:

67192472) VS.HSUPA.HHO.E2D.SuccOutInterFreq (ID:

67192474)




How to Get the Call Drop Cause? If RNC triggers release request abnormally, it will tell CN

the reason of release request and then the corresponding counter will be triggered. So these counters can be used to analyze the call drop cause.

Page29

CNRNC

IU Release Command

IU Release Complete


In this signaling, RNC tells CN the reason of release request. Different counters will be triggered by corresponding reason. These counters can be used to analyze the reason of call drop.


Number of Released RABs due to RF cause (RNC Level)

VS.RAB.AbnormRel.CS.RF.RNC (ID: 67174954) Number of CS RABs Abnormally Released due to RF

cause for RNC VS.RAB.AbnormRel.PS.RF.RNC (ID: 67174955)

Number of PS RABs Abnormally Released due to RF cause for RNC

Page30


CS RABs Abnormally Released Triggered Due to Different Causes (Cell Level) VS.RAB.AbnormRel.CS.IuAAL2 (ID: 67180080) VS.RAB.AbnormRel.CS.RF (ID: 67179777) VS.RAB.AbnormRel.CS.OM (ID: 67179767) VS.RAB.AbnormRel.CS.Preempt (ID: 67179769) VS.RAB.AbnormRel.CS.UTRANgen (ID:

67179768) VS.RAB.AbnormRel.CS.OLC (ID: 67190841)

Page31


CS RABs Abnormally Released Due to Different RF Causes (Cell Level) VS.RAB.AbnormRel.CS.RF.ULSync (ID: 67189568)

Number of CS RABs Abnormally Released Due to Uplink Synchronization Failure for Cell

VS.RAB.AbnormRel.CS.RF.UuNoReply (ID: 67190505) Number of CS RABs Abnormally Released Due to Failure in the

Radio Interface Procedure for Cell VS.RAB.AbnormRel.CS.RF.SRBReset (ID: 67180077)

Number of CS RABs Abnormally Released Due to Signaling RLC Reset for Cell

Page32


Counter Relationship

Page33

Counter Sub Counter Sub Counter

VS.RAB.AbnormRel.CS

VS.RAB.AbnormRel.CS.OMVS.RAB.AbnormRel.CS.PreemptVS.RAB.AbnormRel.CS.UTRANgenVS.RAB.AbnormRel.CS.IuAAL2VS.RAB.AbnormRel.CS.OLC

VS.RAB.AbnormRel.CS.RF

VS.RAB.AbnormRel.CS.RF.ULSyncVS.RAB.AbnormRel.CS.RF.UuNoReplyVS.RAB.AbnormRel.CS.RF.SRBReset


PS RABs Abnormally Released Triggered Due to Different Causes (Cell Level) VS.RAB.AbnormRel.PS.GTPULoss (ID:

67180081) VS.RAB.AbnormRel.PS.RF (ID: 67179780) VS.RAB.AbnormRel.PS.OM (ID: 67180074) VS.RAB.AbnormRel.PS.Preempt (ID: 67180076) VS.RAB.AbnormRel.PS.OLC (ID: 67190840)

Page34


PS RABs Abnormally Released Due to Different RF Causes (Cell Level) VS.RAB.AbnormRel.PS.RF.ULSync (ID: 67189572)

Number of PS RABs Abnormally Released Due to Uplink Synchronization Failure for Cell

VS.RAB.AbnormRel.PS.RF.UuNoReply (ID: 67190506) Number of PS RABs Abnormally Released Due to Failure in the Radio

Interface Procedure for Cell VS.RAB.AbnormRel.PS.RF.SRBReset (ID: 67180078)

Number of PS RABs Abnormally Released Due to Signaling RLC Reset for Cell

VS.RAB.AbnormRel.PS.RF.TRBReset (ID: 67180079) Number of PS RABs Abnormally Released Due to Traffic RLC Reset for Cell

Page35


Counter Relationship

Page36

Counter Sub Counter Sub Counter

VS.RAB.AbnormRel.PS

VS.RAB.AbnormRel.PS.OMVS.RAB.AbnormRel.PS.PreemptVS.RAB.AbnormRel.PS.GTPULossVS.RAB.AbnormRel.PS.OLC

VS.RAB.AbnormRel.PS.RF

VS.RAB.AbnormRel.PS.RF.ULSyncVS.RAB.AbnormRel.PS.RF.UuNoReplyVS.RAB.AbnormRel.PS.RF.SRBResetVS.RAB.AbnormRel.PS.RF.TRBReset


A Example of CS RABs Abnormally Released Due to Different Causes

VS.RAB.AbnormRel.CS.OM

VS.RAB.AbnormRel.CS.Preempt

VS.RAB.AbnormRel.CS.UTRANgen

VS.RAB.AbnormRel.CS.RF.SRBReset

VS.RAB.AbnormRel.CS.RF.ULSync

VS.RAB.AbnormRel.CS.RF.UuNoReply

VS.RAB.AbnormRel.CS.IuAAL2

Cell 1 0 0 0 14 10 37 0Cell 2 0 0 0 12 8 21 0Cell 3 0 0 0 11 11 14 0Cell 4 0 0 0 5 4 16 0Cell 5 0 0 0 5 6 17 0Cell 6 0 0 0 7 5 14 0Cell 7 0 0 0 1 3 14 0Cell 8 0 0 0 5 1 19 0Cell 9 0 0 0 3 4 17 0Cell 10 0 0 0 3 3 11 0

Page37


A Example of PS RABs Abnormally Released Due to Different Causes

VS.RAB.AbnormRel.PS.OM

VS.RAB.AbnormRel.PS.Preempt

VS.RAB.AbnormRel.PS.RF.SRBReset + VS.RAB.AbnormRel.PS.RF.TRBReset

VS.RAB.AbnormRel.PS.RF.ULSync

VS.RAB.AbnormRel.PS.RF.UuNoReply

VS.RAB.AbnormRel.PS.GTUPLoss

Cell 1 0 0 679 248 515 0Cell 2 0 0 437 81 667 0Cell 3 0 0 394 295 371 0Cell 4 0 0 368 306 319 0Cell 5 0 0 356 214 338 0Cell 6 0 0 379 98 320 0Cell 7 0 0 326 79 348 0Cell 8 0 0 302 63 267 0Cell 9 0 0 180 20 600 0Cell 10 0 0 329 113 188 0

Page38

Thank youwww.huawei.com

Documents

OWO207030 WCDMA RAN15 Call Drop KPI and Relative Counters ISSUE 1.00