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LVR/P-97:0532 Rev B 1999-02-05 1(14)

© Ericsson. For limited internal use only

NETWORK PERFORMANCE IMPROVEMENTSERVICES DESCRIPTIONFOR THE AREA RADIO NETWORKFEATURES UTILISATION

Abstract

This document describes the requirements and actions for Radio NetworkFeatures Utilisation analysis in a Network Performance Improvement (NPI)service project.

The Radio Network Feature Utilisation analysis is part of the ResourceUtilisation area within the NPI service packages.

Table of Contents

1 SPECIFICATION .......................................................................................... 2

1.1 DESCRIPTION ............................................................................................ 21.2 PURPOSE................................................................................................... 4

2 PREPARATION ............................................................................................ 4

2.1 PREREQUISITES ......................................................................................... 42.2 TOOLS ...................................................................................................... 42.3 PREPARATION ACTIVITIES .......................................................................... 5

3 ANALYSIS..................................................................................................... 5

3.1 WORK FLOW ............................................................................................. 53.2 HOW TO ANALYSE ..................................................................................... 63.3 RESULTS................................................................................................... 9

4 ON SITE ACTIVITIES.................................................................................. 9

4.1 GENERAL.................................................................................................. 94.2 PREPARATION ........................................................................................... 94.3 ANALYSIS ................................................................................................. 94.4 RESULTS..................................................................................................10

5 REPORT .......................................................................................................10

5.1 REPORT CONTENTS...................................................................................105.2 RADIO NETWORK FEATURES AND PARAMETER SETTINGS (EXAMPLE) ...........11

6 REFERENCES..............................................................................................13

7 REVISION HISTORY..................................................................................14

NETWORK PERFORMANCE IMPROVEMENT ANALYSIS

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1 Specification

1.1 DescriptionThe area consists of these parts:

• Evaluation (desk check) of parameter settings for radio features in order tofind unreasonable parameter setting, having the consequence that thefeature is not performing to its full extent.

• Recommendations of radio features that are not activated but can help theCustomer to improve the network performance. This part shall support theCustomer with information of how the different radio features may improvehis specific network. (Examples from other networks or other experience onhow to utilise the different radio features etc).

• Optional, On-Site Avtivity: Finding the optimal parameter setting for acertain radio network feature.

The radio features that shall be included are:

• Idle Mode Behaviour (for cell selection)

• Locating

• Dynamic MS Power Control

• Dynamic BTS Power Control

• DTX

• Frequency Hopping

• Intra-Cell Handover

• Assignment to Another Cell

• OL/UL Subcells

• Hierarchical Cell Structure

• Extended Range

• Immediate Assignment on TCH

• Double BA Lists

• Idle Channel Measurements

• Cell Load Sharing

• Multiband Operation

• Differential Channel Allocation

• Adaptive Configuration of Logical Channels

RESOURCE UTILISATION, RADIO FEATURE UTILISATION

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• Efficient Priority Handling


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1.2 PurposeThe purpose of this area is to find improved parameter settings on radiofeatures in the Customers network. This may lead to that the radio feature is notperforming to its full extent and therefore not improving the quality in thenetwork.

Radio features for improving capacity for the existing network (without majorHW investments) should be given high priority, e.g. Assignment to AnotherCell, Cell Load Sharing, Hierarchical Cell Structure, Overlaid/UnderlaidSubcells, Immediate Assignment on TCH, etc.

The Customer benefits with this area may be a reduction (or delay) ofinvestments, improved quality and capacity by means of features.

2 Preparation

2.1 PrerequisitesAccess to AXEL (AXE Library Explorer, e.g. under the web-address:http://alex1.lmf.ericsson.se/alexserv) or latest valid O&M modules to findprintout descriptions.

User Descriptions and Engineering Guidelines for Radio Network Featuresshould be used, ref. [1].

The recommended values for the different radio features used in IPOS/R7 canbe found in ref. [2].

Fetch the command file for the BSC and the MSC from the LAN to retrieve allprintouts from the switches.

2.2 ToolsNecessary tools for collection and processing are listed here.

• IPOS/R7

• OSS/CNA

Note: If OSS/CNA will be used the work flow described in this document willnot be valid.


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2.3 Preparation activitiesInstall the latest version of IPOS/R7. The latest version of the recommendedvalues, ref. [2], should be used. Install the corresponding dBase database file,RecValues.dbf.

Confirm that the latest and valid version of User Descriptions and EngineeringGuidelines for Radio Network Features is accessible.

Information about what radio features the customer has bought must be knownbefore recommendation to activate radio features are done. The local Ericssoncompany should be able to provide this information.

3 Analysis

3.1 Work flow1. Import cell data printouts from the Data Collection into IPOS/R7 (use the

pre-prepared command file). The files in which the printout results shall bestored are generally named BSC1CDD1.LOG and BSC1XCEP.LOG.

2. Get the printout of the MSC/VLR exchange properties (use the pre-preparedcommand file). The file in which the printout results shall be stored isgenerally named from file MSC1MSC2.LOG.

3. Generate the following reports in IPOS/R7:

• Used Features Report.

• Parameter Benchmark Report.

• Parameter Deviation Report.

• CDD Report.

4. Analyse the results.

5. Write the report.


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3.2 How to analyse

The following parameters should be analysed within each radio network feature:

Idle Mode Behaviour ACCMIN, CCHPWR, CRH, CBQ, CRO, TO, PT

Dynamic MS PowerControl:

INIDES, INILEN, SSDES, SSLEN, LCOMPUL,QLEN, QDESUL, QCOMPUL, REGINT,PMARG, DTXFUL, MSTXPWR

Dynamic BTS PowerControl:

SDCCHREG, SSDESDL, SSLENDL,LCOMPDL, QDESDL, QLENDL, QCOMPDL,REGINTDL, PMARG, BSPWRMIN, BSTXPWR

DTX: DTXD, DTXU

Frequency Hopping: HOP, HSN, FHOP, COMB

Intra-Cell Handover: HNDSDCCH (MSC exchange property), IHO,SSOFFSETUL, SSOFFSETDL, QOFFSETUL,QOFFSETDL, TMAXIHO, MAXIHO, TIHO,IHOSICH

Assignment to AnotherCell:

HNDSDCCHTCH (MSC exchange property),ASSOC, AW, CAND, IBHOASS, AWOFFSET,(in earlier releases: TINITAW, TALLOCAW)

OL/UL Subcells: SCTYPE, LOL, TAOL, LOLHYST,TAOLHYST, BSTXPWR, BSPWR, BSPWRT,BSPWRB, TSC, CS, SCLD, SCLDTIMEINT,SCLDLL, SCLDUL

Hierarchical CellStructure:

LEVEL, LEVTHR, LEVHYST, PSSTEMP,PTIMTEMP, FASTMSREG, THO, NHO

Extended Range: XRANGE, MAXTA, TALIM

Immediate Assignmenton TCH:

CHAP

Double BA Lists: MBCCHNO, LISTTYPE, MRNIC

Idle ChannelMeasurements:

LIMIT1, LIMIT2, LIMIT3, LIMIT4, INTAVE,ICMSTATE

Cell Load Sharing: CLSLEVEL, CLSACC, CLSRAMP,HOCLSACC, RHYST, CLSTIMEINTERVAL,LSSTATE, CLSSTATE

Multiband Operation: GSYSTYPE, MODE, MBCCHNO, MBCR,CLMRKMSG

Adaptive Configuration SLEVEL, STIME, CCHPOS, TN, ACSTATE


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of Logical Channels

Differential ChannelAllocation:

INAC, SCTYPE, CHTYPE, CHRATE, PROBF,DCASTATE, EMERGPRL, STATSINTBSC exchange property: DCAHANDOVERMSC exchange properties: CAPLTCHEMER,CAPLTCHSCH, CAPLTCHMOVAL,CAPLSCHMOVAL, CAPLTCHMTVAL,CAPLSCHMTVAL, CAPLTCHMTOVERR,CAPLSCHMTOVERR, CAPLTCHMTPFRE,CAPLSCHMTPREF, SMOASSIGN,SMTASSIGN

Efficient PriorityHandling

PHSTATE

Locating EVALTYPE, TINIT, TALLOC, TURGEN,SSEVALSI, SSEVALSD, QEVALSI, QEVALSD,SSLENSI, SSLENSD, QLENSI, QLENSD,SSRAMPSI, SSRAMPSD, TAAVELEN,MISSNM, MSTXPWR, BSPWR, BSTXPWR,MSRXMIN, BSRXMIN, RLINKT, RLINKUP,MAXTAEricsson1: MSRXSUFF, BSRXSUFF, KHYST,KOFFSET, LHYST, LOFFSET, TRHYST,TROFFSETEricsson3: HYSTSEP, LOHYST, HIHYST,OFFSETUrgencies: QLIMUL, QLIMDL, BQOFFSET,PSSBQ, PTIMBQ, PSSTA, PTIMTA, TALIM,EXTPENHandover: PSSHF, PTIMHF, CS, SCHO,IBHOSICHMSC: HNDTCMDINTRA, HNDRELCHINTRA,HNDTGSOPINTRA, HNDBEFOREBANSW,HNDSDCCHTCH, HNDSDCCH,HNDSDCCHINTO, HNDSDCCHINTI

Most parameters for each feature are set on cell basis. This means that theparameters have to be analysed for every individual cell. The used parametersetting shall be compared with the recommended parameter setting found inref.[2].


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Here are the examples of the different reports generated by IPOS/R7. Thereports are converted from text to table in Word.

Feature Number of cell inUse

Number of cellsnot in Use

MS Power Control 44 0

BTS Power Control 0 44

DTX UL 44 0

DTX DL 44 0

Frequency Hopping 44 0

Etc. …

Table 3-1 Used Feature Report.

Parameter Median High Low

AGBLK 1 1 1

MFRMS 4 4 4

FNOFFSET 0 0 0

TSC 1 7 0

MSTXPWR 33 33 33

Etc. …

Table 3-2 Parameter Benchmark Report.

The most detailed report for analysing the different parameters for the specifiedradio features is the Parameter Deviation Report generated from IPOS/R7. Thisreport gives specific parameter setting for every cell. The report can begenerated sorted by cell or by parameter. This detailed analyse should in generalnot be necessary in the NPI but if needed the Parameter Deviation Report couldbe used.

The CDD Report generated from IPOS/R7 simplifies the analysis of thedifferent features as well. A report of all, or a part of, the cell parameters can becreated with this dialog within IPOS/R7. The report is created as a dBasedatabase file. It can, after creation, be viewed and printed.


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3.3 ResultsIt is not always the case that the recommended parameter settings in ref. [2], arethe ones that shall be used by the specific customer. Every feature andparameter setting should be considered for every individual customer.

4 On Site Activities

4.1 GeneralOn Site Activities are activities which can be performed in addition to the deskanalysis. Anyway, all actions described for the desk analysis need to beperformed and all information collected for the desk study need to be availablebefore on site activities can be started.

4.2 Preparation

4.2.1 PrerequisitesSTS data according to Data Collection Instruction (DCI) [3] needs to becollected. Which data from which object type is needed, depends on the radiofeature which shall be optimised, see [6].

4.2.2 ToolsThe necessary additional tools, if a PC is used, are SPOS, Turtle, the TurtleMS Excel Macro and MS Excel. If OSS is used, SRP (NPI SRP) andApplixWare can be used. Other tools which shall be used is MRR. For specialinvestigations, also TEMS, MTR and CTR are useful. MTR- and CTR-logscan be analysed with help of PMR in OSS.

4.3 Analysis

4.3.1 WorkflowThe feature, which shall be optimised needs to be selected. For this featuredifferent parameter settings, which are thought to give a better performancethan the current (= original) setting, need to be defined.

• Measure the performance (STS, MRR) for the original parameter settingfor a certain time frame.

• Introduce the first parameter setting different from the original one.

• Measure the performance (STS, MRR) for the new parameter setting forthe same time frame as for the performance measurement of the originalsetting.

• If necessary make TEMS test drives and log all information with MTR.


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• For specific problems run CTR.

• Compare the performance of the new setting with the performance of theoriginal setting.

• If applicable repeat bullet 2, 3, (4, 5) and 6 with different parametersettings, until the setting with the best performance is found.

Note, that it is important to select measurement time frames, which havecomparable properties. E.g. a measurement made during busy hour can not becompared with a measurement made during not busy hour.

Note also that not too many parameters shall be changed between twosuccessive measurements, as it will be difficult to find out which parameterreally led to the improvement or worsening of the performance.

4.3.2 How to analyseUse the report from Turtle and the result from MRR as input to the analysis.Main performance areas which need to be compared between two test cases areretainability, i.e. dropped call rate and handover success rate, and serviceintegrity, i.e. RXQUAL distribution. Dependent on the feature also otherperformance information might be of importance.

Analyse as follows:

• Define and extract the performance information, which can be affected bythe parameter changes of the analysed radio feature.

• Compare the above selected performance information for the differentparameter settings tried.

• Try to analyse how the different individual parameters influence theperformance.

• Which was the best parameter setting? Is there a possible better parametersetting? Try it.

4.4 ResultsThe result of the on-site analysis is the best parameter setting for a certain radiofeature. The results of the different parameter settings tried during the analysisof the radio feature need to be documented. It is necessary to describe the bestparameter setting and why it has been chosen

5 Report

5.1 Report contentsEvery radio feature should be discussed individually and it shall berecommended if the radio feature shall be activated, deactivated or to bechanged. If a radio feature is not considered to be changed from its existing


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status it shall not be discussed in the report. If material is needed to explain thefeature and why the recommended change should be done this can be found forevery radio network feature in the User Description and Engineering Guidelines,ref. [1]. In the template chapter below some radio features are discussed andrecommendations added.

5.2 Radio Network Features and Parameter Settings(Example)

5.2.1 MS Power ControlBy activating the feature, MS power control, the average output power for themobiles will be reduced, which means that the uplink interference in the networkwill be reduced. At the same time the power consumption for the mobiles willbe reduced. Another benefit is that the risk of BTS receiver saturation bymobiles close to the BTS will be reduced.

The feature was not activated and this is the parameter setting recommended tobe used when activating MS power control for all cells.

Date Existing setting Recommended newsetting

MSPWRSTATE

QLEN

QVAL

REGINT

DTXFUL

Table 5-1 Parameter settings for MS power control.

5.2.2 Uplink Discontinuous TransmissionDiscontinuous transmission, DTX, is a feature that limits the transmission onlyto the periods when speech is detected over the connection. DTX uplinkdecreases the power consumption in the mobile and reduces the amount ofuplink interference in the network. The following parameter setting isrecommended to be changed.

Date Existing setting Recommended new setting

DTXU


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Table 5-2 Parameter setting for DTX uplink.

5.2.3 Frequency HoppingFrequency hopping means that during a call multiple frequencies will be usedfor the transmission, both on the up- and downlink. The BTS and the MSchange frequency between each burst. This means that the call will be lesssensitive to interference. Frequency hopping will reduce the effect of multipathfading, co-channel and adjacent channel interference.

For the cells with only 1 or 2 TRXs, it is not recommended to activatefrequency hopping. Frequency hopping needs a higher level of operation andmaintenance in order to maintain the TCH availability.

Frequency hopping is recommended to switch on/test in [No. of cells].

5.2.4 Intra-Cell HandoverIntra-cell handover gives a possibility to improve speech quality during aconversation. When bad quality is detected in combination with high signalstrength on the up- or downlink, the call will be handed over to anotherfrequency, if frequency hopping is off, or to another time slot, if frequencyhopping is on, to avoid temporary interference. Reasons for bad quality incombination with high signal strength can be co-channel, adjacent channel orexternal interference.

Before the tuning started, the intra-cell handover feature was not active in [No.of cells with Intra cell HO] cells. Intra-cell handover is recommended to beswitched on in all cells in the BSC.

IHO = ON in cells [Cell names where IHO is to be switched off].


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6 REFERENCES

[1] User Descriptions and Engineering Guidelines for Radio NetworkFeatures, CME 20 R7, EN/LZB 119 3382 R1

[2] Recommended parameter values for different radio network features usedin IPOS/R7, LVR/P-98:0138 Rev A

[3] Data Collection Instruction for NPI services, LVR/P-98:0038 Rev. B

[4] IPOS/R6.1 User Guide, 198 17-CRL 113 231

[5] Mobile Telephony Data, Changeable Exchange Adaptation,2/155 18-1/APT 210 25/2 Uen Rev. B

[6] User Descriptions and Engineering Guidelines, Radio Network Statistics, 7/100 45-HSC 103 12 Uen, Rev. B

[7] BSC STS User Formulas, Ericsson GSM System R7,LVR/R-98:0376 Rev. A


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7 Revision History

Revision Date Remarks

Rev. A 98-01-21 Document responsible: Peter Eriksson, LVR/PO. Review meeting 980120 see LVR/P- 98:0016.

Rev. B 99-02-05 Document Responsible: Stephan Trzeciak, LVR/PO.

Date: Signature:

Author: 1999-02-05 (ERASTEP)

Checked: 1999-02-20 (ERASOOM)

Approved: 1999-02-26 (ERASTA)

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