Analysis of parameter problems

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If the KPI deterioration of a cell is not closely related to equipment, load, interference or coverage, we need to check cell parameters carefully.

We need to make sure whether the history of network operations contains any parameter

adjustment related to this cell, including adjustment of adjacent cell relationship and RF parameter adjustment. If cell parameter adjustment has been made recently, we need to make a careful analysis. Meanwhile, the impact of early parameter adjustment on the recent KPI should not be eliminated. We also need to check whether there is a big increase in the traffic of this cell. If traffic increases sharply, the unreasonableness of cell parameters will be easily found.

The configuration verification function of the Nastar tool can help quickly check the parameter changes of the same version made on a different day.

Analysis of CHR process and terminal performance problems

The prerequisite to network planning performance analysis is stable product performance and normal equipment. But the bug of actual networks and products always exists. We need to define whether the problem lies in product implementation through performance analysis.

In cell performance analysis, sometimes abnormal access or call drop still occurs even if there is no high load, a cell has normal signal coverage and there is correct parameter configuration. In this case, we need to enable the CHR analysis function of the Nastar tool and use signaling process to make an analysis. The dot information of CHR involves the implementation of a product internal module. CHR analysis does not aim to accurately locate a problem, but to determine the scope of the problem and failure location of abnormal processes. Then, feedback the result to product R&D personnel to provide auxiliary information about the location by the R&D personnel.

Besides RAN equipment problem, terminal problems cannot be excluded in performance analysis.

Many of them have been found in an actual network. Sometimes, a terminal transmits at a fixed power and the conditions that a terminal satisfies measurement reports fail to be reported in time.

For the sake of query, terminal problems found in existing network can be classified and included in a list.

RAN equipment problems and terminal problems seldom appear, therefore they are put at the end of performance analysis. In analyzing abnormal PIs, after excluding multiple possible causes, we should dare to doubt equipment problems and give reasonable evidence based on CHR.

7.7 Brief Summary

Performance analysis and quality early warning is the pivotal moment for discover problem exactly and timely,It is also the foundation of in-depth analysis and qualification of constituting latter scheme.The chapter introduce the procedures and methods of performance Analysis,aim to provide reference for analysis operations and improve the efficiency of UMTS network performance anal.

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8 Conclusion

As the mobile communication technology develops, the limits between related technologies become obscure. The functions of the base station controller (BSC) and the base station overlap, and (radio) network planning and optimization integrates with radio product functions. There is a common object, that is, to improve the market adaptability and networking capability of radio products and the quality of radio networks.

The radio system features the mobility of users and cellular networking structure. The network planning and optimization engineers need to have a deep understanding of the complexity and association of macro radio cellular networking, and to show insight to customers' requirements and the potential changes in radio networks.

In addition to paying attention to the principles and means of radio network optimization, the network planning and optimization engineers need to understand debugging of radio equipment and core network, and summarize experience and acquire more theoretical knowledge through actual network optimization practices and by studying cases at http://support.huawei.com to become excellent engineers.

The W-LPI Monitoring and Optimization Guide summarizes the overall idea and necessary

procedure of common KPI analysis in optimization of radio networks. Due to the current conditions, some descriptions in this Guide are not perfect, requiring studies and accumulations in subsequent practices.

Pay attention to the following in revising later versions:

l Update relevant analysis methods and indexes according to the change in RAN versions.

l Add the latest optimization technologies and methods according to the latest practice.

l Because PCHR is available since 2008, add relevant cases in light of the PCHR applications in revising the later versions of this Guide.

Feed back the comments on revision of this Guide at http://gcrms.huawei.com.

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9 References

Except 3GPP from the 3GPP organization, the following references are internal documents of Huawei.

l 3GPP 21.905 Vocabulary for 3GPP Specifications

l 3GPP 25.931 UTRAN Functions Examples on Signaling Procedures

l 3GPP 25.331 Radio Resource Control

l 3GPP 25.433 Iub interface NBAP Signaling

l 3GPP 25.423 Iur interface RNSAP Signaling

l 3GPP 25.413 Iu interface RANAP Signaling

l 3GPP 25.104 BS Transmission and Reception

l 3GPP 25.101 UE Transmission and Reception

l Guide to W-KPI Monitoring and Optimization – Optimization of PS Service Problems

l W-RF Optimizing Guide

l W-DT&CQT Tests Guide

l Guide to Operations in W-Equipment Room

l W-Interference Analysis Guide

l RAN Signaling Analysis Guide

l RAN Performance Counter Reference

l RAN Feature Description

l WCDMA Performance - Radio Access Network KPI Definition Manual

l Function Acceptance Test Specification for KPI Test

l UMTS Network KPI Baseline

l BSC6810 V200R010 Product Description

l UMTS Network Evaluation Optimization Detailed Instructions On V100R001 V100R001－Network Performance

l UMTS Network Evaluation Optimization Detailed Instructions On V100R001－Resouce and capability

l UMTS Performance Advance Serve Proposal On Serve Procedure V002R001

l UMTS Radio Network Durative Optimization Serve Proposal On Serve Procedure V002R001

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l HSPA Performance Advance Serve Proposal On Serve Procedure V100R002

l GENEX Probe User Manual

l GENEX Assistant User Manual

l GENEX Nastar WCDMA User Manual

l W-Accessibility Problem Optimization Guide-20071205-A-3.3

l W-Neighbor Problem Optimization-20071010-A-1.2

l W-Handeover And Call Drop Problem Optimization Guide -20071213-A-3.3

l W-Network Performance Analysis Guide-20061109-A-3.0

l W-Transmission Problem Analysis Guide-20080305-A-3.3

l W-HSDPA Rate Problem Location Guide -A-1.0

l WCDMA RNC CHR Analysis Guide

l RAN10 IPRAN Deployment Guide-20080825-A-2.0

l RAN10 MBMS Deployment Guide-20080821-A-1.3

l RAN10 HSDPA Deployment Guide-20080821-A-2.0

l RAN10 HSUPA Deployment Guide-20080821-A-2.0