Rno Slides

02/ 03813-LZU 108 5963 GSM OSS Radio Network Optimizers1

RNO - Radio Network Optimization


NCS/NOX NCS/NOX FAS/FOX FAS/FOXTET TET MRR MRR

R-PMO R-PMO

NWS-A NWS-A NWS-A

MTRCTRCER

RNO

Planning Tuning Troubleshooting

R-PMO

PMR

NWS

Network optimization tools


RNO - Common Structure

ReportsExport

BSC

RNO Applications

CNA SDM

Recording Definition

RecordingData

CountersChangeOrder

Implemen-

tation

DataCollection


RNO - System Parameters


Recording Session


Radio Statistics based on Mobiles measurement reports

MRR - Measurement Result Recording


Supervision

NetworkPerformance

Implementation

CNA

Verification

Compare Radio Characteristics

before and after change of parameters

Analysis

Signal Strength

Signal Quality

Ms Power level

BTS Power Reduction

Timing Advance

(Path loss)

MRR - Optimization


• Bad speech quality

• Interference detection

• Tuning of HCS parameters

• Cell covers to much

MRR - Example of usage


The cell carries traffic for TA=32. Check if this is consistent with cell plan (map)

Cell covers too much (TA - recording)


• Signal Strength, Uplink and Downlink (-47 < Rxlev< -110 dBm)

• Signal Quality, Uplink and Downlink (0< RxQual < 7)

• MS Power Level (0-39 dBm)

• BTS Power Reduction (0, -2, -4, ……-28, -30 dB)

• Timing Advance (0-127 GSM??)

• (Path Loss, Uplink and Downlink)

MRR - Measured Radio Characteristics


MRR - Important Recording Parameters


MRR - Reports

• Overview Report

• Overview Histogram

• Cell Histogram

• Trend Report

• Top Ten Chart

• Comparison Report

• Cell Comparison Histogram

• Comparison Chart


MRR - Overview Histogram


Finding the Effects of a Change

Order a recording for the

area of the network

that will be changed

Switch on, for instance,

DTX in the BSC

Order a new Recording

after one or a few days

Open the Comparison Report check if Quality and

Performance have improved


NCS/NOX - Neighbouring Cell Support/eXpert

Find missing

neighbour relations

Find unnecessary neighbour cell relations


Supervision

HO attempts

-success rate

-reversions

-failures

Implementation

CNA

Verification

Improved Handover statistics

Analysis

Ranking of

HO candidats

Compare defined NR

with Test frequencies

NCS/NOX - Optimization


• Find new Neighbour Relations

• Remove unnecessary Neighbour Relations

• (Areas with no dominant server)

• (Adding a new cell)

NCS/NOX - Examples of usage

“Circle of death”


NCS - Important Recording Parameters


Active BA-list Recording

Serving Cell

BCCH 35BSIC 12

BCCH 35BSIC 12

BCCH 37BSIC 23

BCCH 37BSIC 23

Undefined Neighbour Cell

Defined Neighbour Cell

Transmit Active BA-list(35, 37, 33)

Mobile listen for BCCH 35, 37, 33

BSCBSC

BCCH 33BSIC 17

BCCH 33BSIC 17

Test frequency


Recording Session


Measuring cell

Measured Data

RxLev = -85 BSIC = 12BCCH = 65

BSIC/BCCH = 12/65

BSIC/BCCH = 12/65

BSIC/BCCH = 12/65

NCS/NOX - Finding probable cell


• Overview Report

• Cell Report

• Detailed Cell Report

• Cell Report Chart

• Change Order

• Probable Neigbouring Cell Report

NCS - Reports


NCS - Cell Report


NCS - Change Order

NCS Cell Report

NCS Change order

Cell ACell BCell X

Add Neighbour toChange order Export to CNA

planned area

Update network


NOX - Neigbouring cell list Optimization eXpert

Recording

Recording

Reallocation AlgorithmReallocation Algorithm

Implemen-tation

Implemen-tation

Recommended Change Order


CNACNA

Recommendation Mode

NCS-recordingNCS-recording

-Data from BAR-recording-Handover statistics-Network data-Parameters of the reallocation algorithm-Barring Matrix

Automatic Mode


Recording Session - Recommended or automated mode


• Change Order Recommendation

• Change Order Evaluation

• (Reallocation Log)

NOX - Reports


NOX - Change Order Recommendation


FAS/FOX - Frequency allocation support/ eXpert

Interference Signals on the uplinkInterference Signals on the uplink

Interference Signals on the downlinkInterference Signals on the downlink


Supervision

Interference level

Drop rate

Speech Quality

Implementation

CNA

Verification

Compare Interferenceafter change offrequency plan

Analysis

UL: Interference

distribution

DL: ICDM, PIT

FAS/FOX - Optimization


• Identify bad BCCH/TCH frequency

• Detect external interference

• (Antenna in wrong direction)

• (Areas with no dominant server)

FAS/FOX - Examples of usage

KJ

L

XHG

I


FAS/FOX

How to see uplink How to see uplink Interference ?Interference ?

• TRX measures the uplink interference repeatedly on configured and test frequencies

• Samples every 15 sec

• Use RIR function in BSC


No of Samples

Interference (dBm)

50 th percentile (median)

I= -105 dBm I= -75 dBm

90 th percentile

Percentile: Tells the value I dBm below which x% of the samples fall x th percentile

I (dBm)

Distribution of uplink interference


FAS/FOX

How to see downlink How to see downlink Interference ?Interference ?

• Measurement Reports from MS on configured and test frequencies are collected

• ICDM & PIT are computed to give estimation of downlink interference

• Use BAR function in BSC


Interference

9600143

dB

A

C

Carrier, f1CA

<0 dB

Distance

Adjacent, f2f2 = f1 ± 200 kHz

Co-channel

9600142

dB

C

I

Carrier, f1

CI

>0 dB

Distance

Interferer, f1

Adjacent channel

C/I > 9 dB (GSM specification)

C/I > 12 dB (Ericsson recommended)

C/I > 9 dB (If Fq. hopping is used)

C/A > -9 dB (GSM specification)

C/A > 3 dB (Ericsson recommended)


FAS - Important Recording Parameters


• Overview Report

• Cell Report

• Cell Report Chart

• Overview Comparison Report

• Cell Comparison Report

• UL Data Validity Report

FAS - reports


FAS - Cell Report


• Shows how much one specific cell interferes other cell

• ICDM is used to compute PIT values

• ICDM can be imported to TCP to simulate downlink interference instead of predicted data

ICDM - Inter Cell Dependency Matrix


• ICDM Report

• ICDM Validity Report

• ICDM Probable Interfering Cell Report

FAS - ICDM reports


• Estimation of downlink interference

• Calculated for all frequencies in all cells

PIT - Percentage Interfered Traffic


FOX - Frequency Optimization eXpert

Recording

Recording

Reallocation AlgorithmReallocation Algorithm

Implemen-

tation

Implemen-

tation



CNACNA

Recommendation Mode

FAS-recordingFAS-recording

Automatic Mode


FOX - Reallocation Search Settings


FOX - Reallocation algorithm step 1

TentativeSuggestions

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UL DataReliability

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Same freqset check

Check forhalted cells Prioritize

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FOX - Reallocation algorithm step 2

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Start with first freq in prioritized list

Same frequency

check

Barring &spacing check

Overall PITreduction check

List empty?RecalculatePIT

Finished


• Change Order Recommendation

• Change Order Evaluation

• Reallocation Log

FOX - Reports


FOX - Change Order Recomendation


TET - Traffic Estimation Tool

????Hot Spot Finder

Off-load

Off-loadOff-load


TET - Important Recording Parameters


TET - Reports

• (Open Report)

• Overview Report

• Traffic Level and Off-Load Report

• Traffic Level Chart of Surrounding Cells Report

Documents

Rno Slides