Dimensioning Dimensioning WizardWizard®®

ATEC 2005

Time slots on the air interface are a limited pole of resources to be used for:

– Paging and service request, using BCCH TS and an extra paging TS (exCH) when needed.

– Voice call setup, using SDCCH– Voice Call, using TCH– Data connation, using PDCH

Default TS configuration is TCH unless TS is reconfigured to one of the three other types: exCH, SDCCH, PDTCH.

Air Interface Air Interface DimensioningDimensioning

Different rules for Different rules for different TSdifferent TS

TCH TS: is dimensioned based on the desired GoS and according to Erlang-B table. GoS for TCH is typically 2% to 5%.

SDCCH TS: is dimensioned based on the desired GoS and according to Erlang-B table. GoS for SDCCH is typically 0.1%.

PDCH TS: is dimensioned based on the desired average user data throughput.

ExCH: is configured if Paging load exceeds the capacity of the BCCH paging.

Manual TS DimensioningManual TS Dimensioning

Filter cells from based on that statistics that shows a need for addition or removal of SDCCHs, PDCHs, and eCCH.For every site audit the existing TS configurations to find the appropriate TRX and TS to be used.Pass this information to BSS engineering to create a command file for every one of these sites.Perform all the steps every week.How long would it take and how accurate to cover 5000 cells?

What ifWhat if

How would the network be affected if not dimensioned properly and on periodic basis?

Initial SDCCH Initial SDCCH GuidelinesGuidelines

SDCCH Allocation Engineering Guidelines

Abbreviation TS0 TS1 TS2 TS3 TS4 to TS7C mainBCCHcombined TCH TCH TCH pDTCHB mainBCCH TCH TCH TCH pDTCHb mainBCCH SDCCH TCH TCH pDTCHS TCH SDCCH TCH TCH TCHT TCH TCH TCH TCH TCH

TRX/Cell SDCCH8/Cell TCH/Cell TDMA/Cell Priorities1 0 5 C 01 1 4 b 02 1 12 bT 0,13 2 19 BSS 0,1,24 3 26 BSSS 0,1,2,35 4 33 BSSSS 0,1,2,3,46 4 41 BSSSST 0,1,2,3,4,57 5 48 BSSSSTS 0,1,2,3,4,5,68 5 56 BSSSSTST 0,1,2,3,4,5,6,79 6 63 BSSSSTSTS 0,1,2,3,4,5,6,7,8

10 6 71 BSSSSTSTST 0,1,2,3,4,5,6,7,8,911 7 78 BSSSSTSTSTS 0,1,2,3,4,5,6,7,8,9,1012 7 86 BSSSSTSTSTST 0,1,2,3,4,5,6,7,8,9,10,11

* Of the 4 pDTCH channels, 2 are fixed for GPRS and 2 are allocated to traffic as a priority.* Additional pDTCH channels will be added to TS1-3 on TDMA 0 and then only on TS4-7 on additional

tdmas as GPRS traffic demands dictate

Later ..Later ..

TRX/Cell SDCCH8/Cell Sector Count Com

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1 1 0 226 1 226 52 1 1609 9 3 9 1531 59 6 13 2 1140 1 22 1034 64 16 3 14 3 1143 8 352 703 65 10 3 25 4 850 35 521 259 22 5 4 1 36 4 460 18 260 140 23 12 5 27 5 379 2 31 228 90 13 5 4 4 1 28 5 234 9 132 60 20 9 2 1 19 6 87 1 32 18 25 4 3 2 1 110 6 67 2 16 31 14 3 111 7 31 9 8 12 212 7 39 6 12 3 10 5 1 1 116 9 1 1

Exceeds SDCCHs allowed by the ruleLess than SDCCHs allowed by the ruleDon't have SDCCHs defined

If SDCCH is not maintained periodically, wrong and unnecessary configurations could build overtime as shown in the sample audit belowA good example are the sites without sdcch defined and sites with lower or higher number of SDCCH resources defined.The numbers marked in red and yellow are undesired deviations.

Dimensioning WizardDimensioning Wizard

Dimensioning WizardDimensioning WizardDimensioning Wizard is designed to dynamically configure the required number of TS of each type to accommodate the carried traffic and based on the operator guidelines.

The tool works independently without the need of Vendor or third party tools.

Dimensioning ProcessDimensioning Process

OMCConfiguration

DimensionWizard

SDO Counters

FunctionalityFunctionalitySupports Nortel BSS.Perform time slot dimensioning based on customer defined rules and thresholdsPerform dimensioning at Cell, Cluster, BSC, and OMC levels.Dimensioning of Dedicated Signaling channels SDCCH.Auditing of SDCCH discrepancies and perform required correctionProduce SDCCH troubleshooting reportsCompiles OMC-SDO raw counters into SDCCH report.Dimensioning of Packet Data channels PDCH.Auditing of PDCH discrepancies and perform required correctionProduce PDCH troubleshooting reportsCompiles OMC-SDO raw counters into PDCH report.Fully communicates with OMR and SDO to collect required system counters and parameters.

OperatorOperator--Defined SettingDefined Setting

Apply a centralized or Market preset guidelines in a .stg fileHas the ability to accommodate any user required modifications

Dimensioning WizardDimensioning Wizard

Dimensioning of an individual cell, a cluster of cell, one BSC, or one OMCCell selection based on Cell ID, Nortel ID or CGI.

One Cell DimensioningOne Cell Dimensioning

Detailed dimensioning analysis are shown to determine the Detailed dimensioning analysis are shown to determine the new PDCH (or SDCCH) requirement.new PDCH (or SDCCH) requirement.Before and after TS Configuration windowsBefore and after TS Configuration windowsAutomatic selection to the TRX and Automatic selection to the TRX and TS(sTS(s) to be used.) to be used.Suggested Changes are shown to confirm before creating Suggested Changes are shown to confirm before creating command file.command file.

BSC Level DimensioningBSC Level Dimensioning

Output result window with an analysis line for every cellAutomatic creation to the OMC Command file.

SDCCH Channel AuditsSDCCH Channel Audits

Various channel audits and immediate creation of the command file to perform required corrections.

Packet Channels AuditPacket Channels Audit

Various channel audits and immediate creation of the command file to perform required corrections.

Statistical AnalysisStatistical Analysis

To complete Channel Dimensioning, a complete analysis report is produced by category to isolate cells with a “Non-Dimensioning” related issues to be troubleshooted.

FlexibilityFlexibilityUser could produces statistics from SDO counters or use his own prepared data.

The capability to average multiple stats files and exclude points with a user defined standard deviation

FTP SDO counters and OMC parameters directly.

User defined cluster or cell list