01 GSM Measurements for Optimizer OPT 3.0

1 © Noki a Si emens N etwor ks Presentation / PLe / 23.8.2010For public use – IPR applies

NetAct Optimizer 3.0 for GSM

GSM Measurements for Optimizer

2 © Noki a Si emens N etwor ks Presentation / PLe/ 23.8.2010For public use – IPR applies

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STU CHU CMSTU CHU CM

STU CHU CM

WDU

CTU

WDU

OMU OMU

M M

CCMU CCMUCLS

PDE

DX200

BSC PM database

MMRevery 480ms

Raw data

Interference matrix

AutomaticOptimisation

AutomaticOptimisation Configuration

data

Algorithm parameters

User input

Measuring

New Plan

Configurator

Optimizer

Data Flow Example


At the end of this module the trainee should be able to:

Describe the measurements needed for Optimizer

Outline the measurement setup and collection process

Module Objectives


Mobile Measurements

The measurements needed in Optimizer

How to manage BCCH Allocation List (BAL) changes?

• CIP and ARP measurements if equal or less than 32 BCCH frequencies to be measured

• CIP and ARP measurements if more than 32 BCCH frequencies to be measured


The usage of mobile measurements in Optimizer

Mobile measurements are used in Optimizer

• to generate Interference Matrix• to generate timing advance histogram

Interference matrix is used for

- automatic frequency optimisation

- automatic adjacency optimisation

Interference matrices are stored in Optimizer database and not automatically cleaned.


Mobile Measurements in GSM

Defined Adjacent Cell (DAC) measurement collects data from cells defined as adjacent cellsChannel Finder (CF) measurement collects data from non-adjacent cells

Traffic measurements are typically active by defaultThe cells that use the same BCCH channel as the serving cell cannot be measured and are defined as Blind Spots


Mobile Measurement Report example


Mobile measurements

BSC

Def adj cell measurements

Channel finder measurements

P_NBSC_CHANNEL_FINDER

P_NBSC_DEF_ADJ_CELL

PM DB

MMR

OPTDB_CIP

OPTDB_ARP

OPT DB


Measurement Time

Minimum measurement period depends on the traffic but should be at least 2-3 days

• Less traffic => longer measurement periodMore measurement rounds means longer measurement time

During the measurements and optimisation there must beNO CHANGES to the NW


Preparations

During the measurements the BCCH Allocation Lists (BALs) need to contain every BCCH frequency in the network

Maximum length (theoretical) of the BA list is 32

Common BCCH and WCDMA neighbors will reduce the theoretical maximum BAL length by one each (down to 30)

If there are more than 32 (or 31, or 30) BCCH frequencies in the network the measurements need to be run in several cycles of equal length but with different BA lists


How to measure all BCCHs

If the network has less than 32 BCCHs : create a double BALIf the network has more than 32 BCCHs : rotate the BAL lists

10 20 30

25 neighbour cell BCCH frequencies+ serving cell frequency

(max) 6 free places


How to get the measurements

BAL rotation tool for CIP, ARP

Double BAL for CIP, ARP

More than 32 BCCH frequencies

Less than 32 BCCH frequencies


Mobile Measurements






CIP and ARP measurements in short

Optimizer – Tools – Network Statistics – Manage Interference Matrices

Retrieve the measurements from PM DB

Using “Prepare GSM IM Creation”wizard

Start the measurements Channel Finder and Defined Adjacent Cell

ZWOA:2, 626,A;Activate the measurement Defined Adjacent Cell

ZWOC,10,65,00FF;Activate the measurement Channel Finder

This feature is by default active Activate the feature “Double BCCH Allocation List” in the BSC


Select BSCs from the Navigator

Preparing Nokia GSM IM Creation for CIP and ARP (1/15)






























Mobile Measurements






CIP and ARP measurements in short

Optimizer – Tools – Network Statistics – Manage Interference Matrices

Retrieve the measurements from PM DB

Using “Prepare GSM IM Creation”wizard

Start the measurements Channel Finder and Defined Adjacent Cell

ZWOA:2, 626,A;Activate the measurement Defined Adjacent Cell

ZWOC,10,65,00FF;Activate the measurement Channel Finder

ZEQActivate the feature “Double BCCH Allocation List” in the BSC


Using BAL Rotation (1/18)

Select BSCs from the Navigator



More than 32 BCCH frequencies to be measured



More than 32 BCCH frequencies to be measured



To measure more than 32 frequencies using CF and DAC measurements BAL Rotation tool is needed

First you must remove old BAL objects if any exist.





Start the BAL Rotation tool to begin creating BALs





Settings are user specific



Settings are user specific





•Define the weekdays for measurements (for example, Monday, Tuesday).

•Define measurement interval in minutes (1 440 minutes equals 24 hours).

•Define the start time and the stop time (00:00 to 24:00).

•Additional parameters are I/C thresholds for BSCs (lower=-18, higher=0).















Using CM Operations Manager provision the backup plan that was created previously (in order to bring back the original configuration in the network).


Exercise (CIP, ARP)

1. Check how many BCCHs are used in your optimization scope2. Check the version (= release) of the BSCs in your optimization scope3. Check if the needed features in the BSCs are activated4. Use Optimizer wizard Prepare Nokia GSM IM Creation to set up and start the

measurements5. In Optimizer, Retrieve the Interference matrix for your scope


Document change history

First version for OPT 3.0PLe1.023.8.2009

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01 GSM Measurements for Optimizer OPT 3.0

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