UTRAN KPI Analysis Guide-20051010-B-1.0

UTRAN KPI Analysis Guide

Huawei Technologies Co., Ltd

For Internal Only

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Confidentiality level

UTRAN KPI Analysis Guide

For Internal Use Only

RAN Maintenance Dept.

Total 44 Pages

UTRAN KPI Analysis Guide

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RAN Maintenance Dept.

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Reviewed by

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Date

Aug. 10, 2005

Huawei Technologies Co., Ltd. All Rights Reserved

UTRAN KPI Analysis Guide

For Internal Only

Revision Edition Date Aug. 10, 2005

Version

Description The first version is complete.

Author Wang Wei

Use

UTRAN KPI Analysis Guide

For Internal Use Only

Table of Contents 1. Overview ..............................................................................................................................4 1.1

Intended Audience ......................................................................................................4

1.2

Objectives....................................................................................................................4

2. Introduction to Nastar...........................................................................................................5 3. UTRAN KPI Analysis ...........................................................................................................5 3.1

Nastar Tasks ...............................................................................................................5

4. Detailed UTRAN KPI Analysis .............................................................................................7 4.1

Call Completion Rate ..................................................................................................7

4.1.1

RRC Setup Analysis ............................................................................................7

4.1.2

RAB Setup Analysis ..........................................................................................11

4.2

Soft Handover Analysis.............................................................................................18

4.2.1

Overview............................................................................................................19

4.2.2

Cell SHO Prepare Failure Analysis ...................................................................20

4.2.3

Cell SHO Failure Analysis .................................................................................22

4.3

CS Inter-RAT Handover Analysis..............................................................................24

4.3.1

Overview............................................................................................................25

4.3.2

CS Inter-RAT Handover Prepare Failure Analysis ............................................26

4.3.3

CS Inter-RAT Handover Failure Analysis..........................................................28

4.3.4

Cell Inter-RAT Handover Analysis.....................................................................30

4.4

PS Inter-RAT Handover Analysis..............................................................................30

4.4.1

Overview............................................................................................................30

4.4.2

PS Inter-RAT Handover Failure Analysis ..........................................................31

4.4.3

Cell Inter-RAT Handover Analysis.....................................................................33

4.5

Cell Update Analysis .................................................................................................33

4.5.1

Overview............................................................................................................33

4.5.2

Cell Update Failure Analysis .............................................................................34

4.6

Call Drop Analysis.....................................................................................................35

4.6.1

Overview............................................................................................................35

4.6.2

CS Call Drop Analysis .......................................................................................36

4.6.3

PS Call Drop Analysis .......................................................................................37

4.6.4

Cell Call Drop Analysis ......................................................................................39

4.7

Traffic Load Analysis.................................................................................................40

4.7.1

Overview............................................................................................................41

4.7.2

Cell Traffic Analysis ...........................................................................................42

5. Analyzing Complicated Problems ......................................................................................44 5.1

Narrowing Down Area Range and Time Range........................................................44

5.2

Analyzing Abnormal Logs .........................................................................................44

5.3

Analyzing Repeated Problems..................................................................................44

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UTRAN KPI Analysis Guide

For Internal Use Only

UTRAN KPI Analysis Guide 1. Overview In a commercial network, the QoS and network operation are reflected through KPI. UTRAN KPI analysis is a major method used for monitoring and evaluating network operation. UTRAN KPI analysis is also served to track the network traffic, monitor the resource distribution, and facilitate the network expansion and optimization. Huawei UTRAN traffic statistics provides sufficient KPI for network operation, algorithm management, and resource distribution. These traffic statistics can be used to locate network problems and optimize network KPI. UTRAN KPI analysis is a major method for RAN maintenance engineers and network optimization engineers to evaluate network performance. Comparing with drive tests, call detail logs, and alarms, KPI analysis can be used to monitor network operation directly and conveniently. To better locate network problems and optimize network KPI, abnormal indices, call detail logs, tracked messages, and drive tests can be used together. Huawei provides a traffic statistics analysis tool Nastar for UTRAN KPI analysis. Nastar can be used to obtain and analyze UTRAN KPI. This guide introduces how to use Nastar to analyze UTRAN KPI. For more information, refer to GENEX Nastar V400R001C01 User Manual.

1.1 Intended Audience This guide, intended for network maintenance engineers and site audit engineers, introduces Nastar V400R001, which supports the KPI analysis of RNC V100R002C03B092 and RNC V100R002C03B151.

1.2 Objectives This guide aims to provide guidance for network maintenance personnel to monitor network KPI on a timely basis, analyze abnormal indices, and find out practical solutions.

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UTRAN KPI Analysis Guide

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2. Introduction to Nastar Nastar provides such functions as index defining, query defining, and report generating. For more information, refer to GENEX Nastar V400R001C01 User Manual.

3. UTRAN KPI Analysis The QoS of communication network is defined in ITU-T E.800. Considering the features of wireless communication network, the following KPI must be considered for WCDMA RAN, as shown in Table 1-1. Network performance

KPI RRC Setup Success Rate

Call completion rate RAB Setup Success Rate Voice Call Drop Rate Call drop rate

VP Call Drop Rate PS Call Drop Rate Soft Handover Success Rate Inter-Frequency HO Success Rate Intra-Frequency HO Success Rate

Mobility management CS Inter-RAT HO Success Rate PS Inter-RAT HO Success Rate Cell Update Success Rate Equivalent User Traffic

Cell Throughput Cell Resource Allocation Table 1-1 WCDMA RAN KPI

3.1 Nastar Tasks Figure 1-1 shows a list of Nastar tasks.

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UTRAN KPI Analysis Guide

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Figure 1-1 Nastar tasks Perf Daily Report and Perf Weekly Report can be generated in .xls file by Nastar. An object can be a self-defined clutter or RNC. Perf Daily Report is used to monitor network performance. By default, Perf Daily Report includes the following KPI, as shown in Table 1-2. RNC Name Traffic

Access

HO

CDR

RNC:1

CS User Based on Equivalent User

17.13(16:00 ~ 17:00)

PS User Based on Equivalent User

54.09(12:00 ~ 13:00)

RRC Connection Setup Success Rate(service)(>95%)

98.64%(2468/2502)

RRC Connection Setup Success Rate(other)(>95%)

96.87%(36445/37624)

AMR RAB Assignment Success Rate(>95%)

99.00%(990/1000)

Video Call RAB Assignment Success Rate(>95%)

100.00%(29/29)

PS RAB Assignment Success Rate(>95%)

99.60%(997/1001)

RB Setup Success Rate(>95%)

99.31%(2016/2030)

Soft Handover Success Rate(>98%)

99.75%(17090/17132)

Softer Handover Success Rate(>98%)

99.66%(3509/3521)

Soft Handover Factor based on Radio Link Number(85%)

100.00%(16/16)

CS Inter-RAT Handover Success Rate( from UTRAN to GSM)(>85%)

100.00%(4/4)

PS Inter-RAT Handover Success Rate( from UTRAN to GSM)(>85%)

66.67%(4/6)

CS AMR Call Drop Rate(