Huawei Wcdma Call Drop Counter And Kpi Introduction.pdf

WCDMA Call Drop Counter and KPI Introduction HUAWEI TECHNOLOGIES CO , LTD www huawei com HUAWEI Confidential Security Level WCDMA Call Drop Counter System and KPI ISSUE 1 0 HUAWEI TECHNOLOGIES CO , LT[.]

Security Level:

WCDMA Call Drop Counter

System and KPI

ISSUE 1.0

Call drop is an very important index for evaluating network performance.

Call drop can be calculated based on different cells and RNC for different services

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

Describe call drop counter system

Know the call drop KPI

Call Drop Rate Signaling Procedure

After RAB is setup successfully, Iu release command is sent by CN due to Iu release request or RAB release request from RNC And the corresponding reasons are not:

− Successful Relocation

− User Inactivity

− Normal Release

Chapter 1 RNC Call Drop Counter system and KPI Chapter 2 Cell Call Drop Counter system and KPI

RNC Call Drop Counters System

RAB.RelAbnormal.RNC

− Based on QoS: Conversational & Streaming

− Based on Services: AMR & CS64K

− Based abnormal reasons:

▪ RAB preempted

▪ UTRAN generated reason

▪ OM intervention

▪ Iu interface AAL2 link abnormity

▪ UE Signaling Connection Release

▪ CELL congestion

− Based on RF reasons:

RNC Call Drop Counters System

RAB.RelAbnormal.RNC

− Based on QoS: Conversational, Streaming, Interactive & Background

− Based on Services: PS 64K, PS 128K & PS 384K

− Based abnormal reasons:

RNC Call Drop Counters System

RNC Call Drop Counters System

RAB Release triggered by RNC due to RF reason (RNC)

CS: VS.RAB.Loss.CS.RF.RNC

− Due to Failure in the Radio Interface Procedure: VS.RAB.Loss.CS.RF.UuNoReply.RNC

− Due to signaling RLC reset: VS.RAB.Loss.CS.SRBReset.RNC

PS: VS.RAB.Loss.PS.RF.RNC

− Due to Failure in the Radio Interface Procedure: VS.RAB.Loss.PS.RF.UuNoReply.RNC

− Due to signaling RLC reset: VS.RAB.Loss.PS.SRBReset.RNC

− Due to traffic Radio Link Control (RLC) Reset: VS.RAB.Loss.PS.TRBReset.RNC

RNC Call Drop Counters System

RAB Release triggered by RNC due to Abnormal Reason (RNC)

RNC Call Drop Counters System

RAB Release triggered by RNC based on different services (RNC)

RNC Call Drop KPI

Call Drop Rate (RNC)

Formula

Measurement scope:

− RNC

Description

− This KPI can be used to evaluate the call drop ratio of different services

in one RNC The call drops will happen due to RNC abnormal release trigged by RAB RELEASE REQUEST or IU RELEASE REQUEST messages

%

100 Re

Re

lease ServiceRAB

lease Abnormal

ServiceRAB CDR

Service

RNC Call Drop KPI

CS AMR Call Drop Rate

RNC Call Drop KPI

PS Service Call Drop Rate

Chapter 1 RNC Call Drop Counter system and KPI Chapter 2 Cell Call Drop Counter system and KPI

Chapter 1 Cell Call Drop Counter system and KPI

1.1 R99/R4 service call drop counter system and KPI 1.2 HSDPA service call drop counter system and KPI

Cell Call Drop Counters System

RAB.RelAbnormal.Cell

− Based on QoS: Conversational & Streaming

− Based on Services: AMR

− Based abnormal reasons:

Cell Call Drop Counters System

RAB.RelAbnormal.Cell

− Based on QoS: Conversational, Streaming, Interactive & Background

− Based on Services: PS 64K, PS 128K & PS 384K

− Based abnormal reasons:

Cell Call Drop Counters System

RAB Release (Cell)

Cell Call Drop Counters System

RAB Release triggered by RNC due to RF reason (Cell)

Cell Call Drop Counters System

RAB Release triggered by RNC due to Abnormal based on different reasons (Cell)

Cell Call Drop Counters System

RAB Release triggered by RNC due to Abnormal based on different services (Cell)

Cell Call Drop Counters System

RAB Release triggered by RNC due to Normal based on different services (Cell)

Cell Call Drop Counters System

RAB Release triggered by RNC based on different services (Cell)

Cell Call Drop KPI

Service Call Drop Rate (Cell)

Formula

Measurement scope:

− Cell

Description

− This KPI can be used to evaluate the call drop ratio of different services

in one cell The call drops will happen due to RNC abnormal release trigged by RAB RELEASE REQUEST or IU RELEASE REQUEST messages

%

100 Re

Re

lease ServiceRAB

lease Abnormal

ServiceRAB CDR

Service

Cell Call Drop KPI

CS AMR Call Drop Rate (Cell)

Cell Call Drop KPI

PS 64K Call Drop Rate (Cell)

Cell Call Drop KPI

PS 384K Call Drop Rate (Cell)

Chapter 1 Cell Call Drop Counter system and KPI

1.1 R99/R4 service call drop counter system and KPI 1.2 HSDPA service call drop counter system and KPI

HSDPA Call Drop Counter

HSDPA service release (Cell)

Due to Abnormal reasons:

− RF reasons : VS.HSDPA.RAB.Loss.RF

▪ Radio Connection With UE Lost

▪ Failure in the Radio Interface Procedure

− Non RF reasons: VS.HSDPA.RAB.Loss.Abnorm.NonRF

Due to Normal reasons:

− Due to inactivity of UE: VS.HSDPA.RAB.Loss.InActivity

▪ User Inactivity

− Due to normal reason: VS.HSDPA.RAB.Loss.Norm

▪ Successful Relocation

HSDPA Call Drop KPI

Service Call Drop Rate (Cell)

%

100 Re

Re

lease HSDPARAB

lease normal

HSDPARABAb CDR

HSDPA

HSDPA Call Drop KPI

HSDPA Call Drop Rate (Cell)

Thank you

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