Chapter 1 2G Optimization and Planning

2g optimization and planning

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Chapter 1

2G optimization and Planning


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Table of Content

1. The optimization process cycle 3

2. Quality of service objectives 6

3. Quality of service evaluation 9

2. Data analysis 52

3. Network capacity optimization 66

4. BSS parameters optimization 83

5. Examples of optimization actions at network level 200


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1. The optimization process cycle


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QoS

objective

Monitoring and collection of

observation data :

OMC counters, radio interface

parameters

Data analysis Optimization action

Optimization action validation

QoS evaluation

Optimization cycle in a GSM network


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2. Quality of service objectives


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3. Quality of service evaluation

3.1. Monitoring techniques


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Collection and global analysis of counters and

alarms at all levels (from physical layer to layer 3)

from the OMC

OMC

Reports


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e.g. : Coverage map after a measurement campaign

This map corresponds to processed

measurements of signal level, performed on radio

interface over a determined area

Best server distribution gives on each

point the cell offering the best signal for the mobile

Example of coverage map after a measurement

campaign


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tri-sectorial site

area covered by cell 0020-2

Example of coverage map after a measurement

campaign


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Capture example of data performance measurements in

GPRS

LLC performance

RLC/MAC performance


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3.2. Computation of the quality of service


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counter name


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MOC Call setup reminder

…

MS BTS BSC MSC

L2 Immediate assignment command (IAM message)

CC Setup

BSSMAP Assignment request

CC Call proceeding

RR channel request Channel required

Channel activation (ref. SDCCH)

Channel activation ack

(UA) CM service request

RACH

SDCCH

AGCH

SDCCH

SDCCH

SDCCH

Assignment complete

(SABM) CM service request (Estab Ind) CM service request BSSMAP Complete L3 Info (CM service request)

Authentication and ciphering

SDCCH

Channel activation (ref. TCH)


RR Assignment command(TCH)

UA

FACCHSABM Establishment Indication

FACCH

FACCH

L2 Immediate Assignment command (reject)

Channel activation nack

RR Immediate assignment (SDCCH)

RR Immediate assignment rej

Estab Failure

BSSMAP Assignment failure

BSSMAP Assignment failureChannel activation nack

RR Assignment complete


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Call_estab_fail_ratioMS BTS BSC MSC

L3 Immediate assignment command (IAM message)

CC Setup

BSSMAP Assignment request

CC Call proceeding

RR channel request Channel required

Channel activation (ref. SDCCH)


UA

RACH

SDCCH

AGCH

SDCCH

SDCCH

SDCCH

Assignment complete

SABM( CM service request ) Estab Ind( CM service request )

Authentication and cipheringSDCCH

Channel activation (ref. TCH)


RR Assignment command(TCH)

UA

FACCHSABM Establish Indication

FACCH

RR Assignment completeFACCH

L3 Immediate Assignment command (reject)

Channel activation nack

RR Immediate assignment (SDCCH)

RR Immediate assignment rej

Estab Failure

BSSMAP Assignment failure (1)

BSSMAP Assignment failure (2)Channel activation nack

set T3107

stop T3107RF channel release(SDCCH)

set T3101

stop T3101

BSSMAP Assignment failure (3)

BSSMAP Complete L3 Info (CM service req.)


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4. Data analysis


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Real case of SDCCH allocation failure monitoring

o m c N a m e B s c N a m e s e c to rN a m e D a te

S D _ A L L O C

(C 1 0 3 4 )

TC H _ O V E R

( C 1 0 5 1 /2 )

S D _ A L L O C _ F A IL

(C 1 0 3 6 )

S D _ A L L O C _ F A IL _ R A TIO

(C 1 0 3 6 / (C 1 0 3 6 + C 1 0 3 4 +

C 1 0 5 1 /2 )

n e tw o rk x x x x x x 1 5 /4 /0 1 4 8 8 1 5 6 2 1 0 7 2 0 ,2 2 %

O M C 1 D N B S C 0 1 c e ll_ 0 1 1 5 /4 /0 1 6 8 6 2 0 2 6 4 3 ,7 0 %

O M C 1 D N B S C 0 4 c e ll_ 0 2 1 5 /4 /0 1 2 8 7 0 1 1 3 ,6 9 %

O M C 1 D N B S C 0 4 c e ll_ 0 3 1 5 /4 /0 1 6 6 4 3 0 2 1 2 3 ,0 9 %

O M C 1 D N B S C 0 3 c e ll_ 0 4 1 5 /4 /0 1 3 5 7 5 0 5 3 1 ,4 6 %

O M C 1 D N B S C 0 3 c e ll_ 0 5 1 5 /4 /0 1 4 8 9 3 0 5 7 1 ,1 5 %

O M C 1 D N B S C 0 1 c e ll_ 0 6 1 5 /4 /0 1 5 4 2 0 0 6 2 1 ,1 3 %

O M C 1 D N B S C 0 1 c e ll_ 0 7 1 5 /4 /0 1 4 9 3 5 0 5 6 1 ,1 2 %

O M C 1 D N B S C 0 1 c e ll_ 0 8 1 5 /4 /0 1 6 0 6 0 6 0 ,9 8 %

O M C 1 D N B S C 0 1 c e ll_ 0 9 1 5 /4 /0 1 5 3 5 1 0 3 8 0 ,7 1 %

O M C 1 D N B S C 0 5 c e ll_ 1 0 1 5 /4 /0 1 1 7 1 0 1 0 ,5 8 %

O M C 1 D N B S C 0 3 c e ll_ 1 1 1 5 /4 /0 1 2 5 7 2 0 1 5 0 ,5 8 %

O M C 1 D N B S C 0 3 c e ll_ 1 2 1 5 /4 /0 1 1 9 1 7 0 1 1 0 ,5 7 %

O M C 1 D N B S C 0 4 c e ll_ 1 3 1 5 /4 /0 1 2 5 6 0 0 1 4 0 ,5 4 %

O M C 1 D N B S C 0 4 c e ll_ 1 4 1 5 /4 /0 1 9 2 3 0 5 0 ,5 4 %

O M C 1 D N B S C 0 2 c e ll_ 1 5 1 5 /4 /0 1 3 5 3 4 0 1 6 0 ,4 5 %

O M C 1 D N B S C 0 1 c e ll_ 1 6 1 5 /4 /0 1 8 9 9 0 4 0 ,4 4 %

O M C 1 D N B S C 0 1 c e ll_ 1 7 1 5 /4 /0 1 4 1 2 4 0 1 8 0 ,4 3 %

O M C 1 D N B S C 0 3 c e ll_ 1 8 1 5 /4 /0 1 2 8 4 5 0 1 2 0 ,4 2 %

O M C 1 D N B S C 0 2 c e ll_ 1 9 1 5 /4 /0 1 4 0 8 2 0 1 5 0 ,3 7 %

O M C 1 D N B S C 0 1 c e ll_ 2 0 1 5 /4 /0 1 2 5 9 9 0 9 0 ,3 5 %

O M C 1 D N B S C 0 2 c e ll_ 2 1 1 5 /4 /0 1 3 5 7 5 0 1 2 0 ,3 3 %

O M C 1 D N B S C 0 3 c e ll_ 2 2 1 5 /4 /0 1 2 9 8 4 0 1 0 0 ,3 3 %

O M C 1 D N B S C 0 1 c e ll_ 2 3 1 5 /4 /0 1 9 0 4 0 3 0 ,3 3 %

O M C 1 D N B S C 0 2 c e ll_ 2 4 1 5 /4 /0 1 9 3 3 0 3 0 ,3 2 %

O M C 1 D N B S C 0 2 c e ll_ 2 5 1 5 /4 /0 1 3 0 2 7 0 9 0 ,3 0 %

O M C 1 D N B S C 0 5 c e ll_ 2 6 1 5 /4 /0 1 4 0 7 0 0 1 2 0 ,2 9 %

O M C 1 D N B S C 0 1 c e ll_ 2 7 1 5 /4 /0 1 3 8 2 0 1 0 ,2 6 %

O M C 1 D N B S C 0 2 c e ll_ 2 8 1 5 /4 /0 1 2 4 6 0 0 6 0 ,2 4 %

O M C 1 D N B S C 0 2 c e ll_ 2 9 1 5 /4 /0 1 2 5 7 2 0 6 0 ,2 3 %

O M C 1 D N B S C 0 5 c e ll_ 3 0 1 5 /4 /0 1 4 3 1 0 1 0 ,2 3 %


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Real case of SDCCH allocation failure monitoring

SDCCH_alloc_fail

0

1000

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ce

ll_

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ce

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ce

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30 w orst ce lls

SD

CC

H a

llo

ca

tio

n

SD_alloc

SD_alloc_fail


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Real case of TCH allocation failure monitoring

o m c N a m e B s c N a m e s e c to rN a m e D a te

TC H _ A L L O C

(C 1 0 5 1 /0 )

TC H _ R E E S

( C 1 0 5 1 /1 )

TC H _ O V E R

(C 1 0 5 1 /2 )

TC H _ F A IL

(C 1 0 3 9 )

TC H _ A L L O C _ F A IL _ R A TIO

(C 1 0 3 9 / (C 1 0 3 9 + C 1 0 5 1 /0 +

C 1 0 5 1 /1 + C 1 0 5 1 /2 )

n e tw o rk x x x x x x 1 5 /4 /0 1 1 8 2 0 8 1 3 3 3 3 9 5 1 6 4 3 1 6 4 9 9 5 8 ,0 8 %

O M C 1 D N B S C 0 1 c e ll_ 0 1 1 5 /4 /0 1 1 1 9 2 4 1 7 1 0 5 4 2 0 4 5 4 6 1 ,1 5 %

O M C 1 D N B S C 0 4 c e ll_ 0 2 1 5 /4 /0 1 1 2 2 9 8 2 7 8 4 3 1 6 8 9 5 5 6 ,2 0 %

O M C 1 D N B S C 0 4 c e ll_ 0 3 1 5 /4 /0 1 2 2 9 7 4 1 4 4 4 1 7 1 8 9 2 6 4 0 ,8 5 %

O M C 1 D N B S C 0 3 c e ll_ 0 4 1 5 /4 /0 1 1 8 2 2 1 6 1 1 1 6 1 2 8 9 1 3 9 ,9 9 %

O M C 1 D N B S C 0 3 c e ll_ 0 5 1 5 /4 /0 1 4 8 5 3 1 6 4 6 6 3 2 2 6 6 0 2 9 ,8 7 %

O M C 1 D N B S C 0 1 c e ll_ 0 6 1 5 /4 /0 1 1 6 7 4 2 7 8 1 3 6 8 7 4 9 5 2 9 ,1 8 %

O M C 1 D N B S C 0 1 c e ll_ 0 7 1 5 /4 /0 1 2 0 6 2 9 3 8 1 8 7 8 4 4 4 2 8 ,8 2 %

O M C 1 D N B S C 0 1 c e ll_ 0 8 1 5 /4 /0 1 2 9 0 7 4 7 7 5 0 8 4 6 3 2 2 ,1 0 %

O M C 1 D N B S C 0 1 c e ll_ 0 9 1 5 /4 /0 1 2 7 0 5 9 0 7 0 3 2 0 ,5 7 %

O M C 1 D N B S C 0 5 c e ll_ 1 0 1 5 /4 /0 1 7 8 5 1 3 6 1 1 8 3 6 1 8 ,8 3 %

O M C 1 D N B S C 0 3 c e ll_ 1 1 1 5 /4 /0 1 8 1 5 2 6 1 0 5 1 6 6 0 1 6 ,7 3 %

O M C 1 D N B S C 0 3 c e ll_ 1 2 1 5 /4 /0 1 1 4 0 3 2 1 1 1 8 1 2 5 2 5 1 5 ,0 8 %

O M C 1 D N B S C 0 4 c e ll_ 1 3 1 5 /4 /0 1 4 9 0 7 8 2 8 1 4 8 7 6 0 0 7 1 0 ,6 1 %

O M C 1 D N B S C 0 4 c e ll_ 1 4 1 5 /4 /0 1 4 1 3 0 6 1 6 8 0 8 4 5 6 9 9 ,7 8 %

O M C 1 D N B S C 0 2 c e ll_ 1 5 1 5 /4 /0 1 4 2 8 5 9 2 7 8 3 0 7 4 9 4 5 8 ,8 1 %

O M C 1 D N B S C 0 1 c e ll_ 1 6 1 5 /4 /0 1 3 8 9 0 3 3 9 8 1 9 3 4 1 9 7 ,9 2 %

O M C 1 D N B S C 0 1 c e ll_ 1 7 1 5 /4 /0 1 4 4 2 0 0 6 8 2 6 0 6 3 8 4 5 7 ,5 8 %

O M C 1 D N B S C 0 3 c e ll_ 1 8 1 5 /4 /0 1 6 5 7 6 1 8 2 0 5 2 0 7 ,2 9 %

O M C 1 D N B S C 0 2 c e ll_ 1 9 1 5 /4 /0 1 7 2 8 8 1 3 3 2 5 6 7 7 ,1 8 %

O M C 1 D N B S C 0 1 c e ll_ 2 0 1 5 /4 /0 1 1 8 6 7 9 8 1 0 4 2 1 4 7 2 6 ,9 4 %

O M C 1 D N B S C 0 2 c e ll_ 2 1 1 5 /4 /0 1 3 6 0 6 1 1 0 5 6 1 4 2 9 1 1 6 ,5 3 %

O M C 1 D N B S C 0 3 c e ll_ 2 2 1 5 /4 /0 1 3 4 5 8 9 1 7 2 0 9 9 2 2 0 3 5 ,6 6 %

O M C 1 D N B S C 0 1 c e ll_ 2 3 1 5 /4 /0 1 4 5 8 2 5 1 2 4 9 5 ,1 5 %

O M C 1 D N B S C 0 2 c e ll_ 2 4 1 5 /4 /0 1 5 7 6 8 6 0 1 0 3 1 4 5 ,1 0 %

O M C 1 D N B S C 0 2 c e ll_ 2 5 1 5 /4 /0 1 3 1 6 6 0 7 4 7 9 1 6 8 3 4 ,9 8 %

O M C 1 D N B S C 0 5 c e ll_ 2 6 1 5 /4 /0 1 4 4 8 5 4 4 2 0 9 4 ,4 4 %

O M C 1 D N B S C 0 1 c e ll_ 2 7 1 5 /4 /0 1 1 7 9 2 2 3 9 6 5 6 8 2 1 4 ,2 2 %

O M C 1 D N B S C 0 2 c e ll_ 2 8 1 5 /4 /0 1 2 4 2 3 3 1 4 8 2 9 1 1 0 2 4 ,2 1 %

O M C 1 D N B S C 0 2 c e ll_ 2 9 1 5 /4 /0 1 1 0 0 6 2 9 6 1 4 3 9 4 ,1 5 %

O M C 1 D N B S C 0 5 c e ll_ 3 0 1 5 /4 /0 1 4 5 5 4 1 6 5 1 9 6 4 ,1 1 %


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Real case of TCH allocation failure monitoringT C H _a llo c_ fa il

0

10000

20000

30000

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50000

60000

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ll_

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ce

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ce

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30 worst ce lls

TC

H a

llo

ca

tio

n

TC H_ALLO C

TC H_ALLO C _FAIL


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Real case of call assignment failure monitoring

o m c N a m e B s c N a m e s e c t o rN a m e D a t e

A S S IG N C M D

(C 1 0 4 9 )

A S S IG N

C O M P

(C 1 0 5 0 ) A S S IG N F A IL A S S IG N _ F A IL _ R A T IO

n e t w o rk x x x x x x 1 5 / 4 / 0 1 1 2 1 8 9 4 4 1 1 8 7 8 8 3 2 3 6 0 3 2 , 5 5 %

O M C 2 S W B S C 0 1 c e l l_ 0 1 1 5 / 4 / 0 1 4 6 6 0 4 0 2 5 5 1 3 1 3 , 6 3 %

O M C 2 S W B S C 0 4 c e l l_ 0 2 1 5 / 4 / 0 1 6 7 4 4 5 8 6 0 6 7 5 1 3 , 1 1 %

O M C 2 S W B S C 0 4 c e l l_ 0 3 1 5 / 4 / 0 1 1 1 5 3 4 1 0 1 2 3 1 3 0 2 1 2 , 2 3 %

O M C 2 S W B S C 0 3 c e l l_ 0 4 1 5 / 4 / 0 1 2 0 6 7 1 8 2 1 2 0 3 1 1 , 9 0 %

O M C 2 S W B S C 0 3 c e l l_ 0 5 1 5 / 4 / 0 1 7 9 4 6 7 0 9 0 7 8 8 1 0 , 7 7 %

O M C 2 S W B S C 0 1 c e l l_ 0 6 1 5 / 4 / 0 1 8 3 8 2 7 5 9 7 7 2 9 9 , 3 7 %

O M C 2 S W B S C 0 1 c e l l_ 0 7 1 5 / 4 / 0 1 2 1 3 7 1 9 6 1 1 4 3 8 , 2 4 %

O M C 2 S W B S C 0 1 c e l l_ 0 8 1 5 / 4 / 0 1 6 1 1 6 5 6 4 9 4 1 4 7 , 6 4 %

O M C 2 S W B S C 0 1 c e l l_ 0 9 1 5 / 4 / 0 1 5 5 6 8 5 1 6 1 3 0 1 7 , 3 1 %

O M C 2 S W B S C 0 5 c e l l_ 1 0 1 5 / 4 / 0 1 5 3 1 5 4 9 2 9 3 3 4 7 , 2 6 %

O M C 2 S W B S C 0 3 c e l l_ 1 1 1 5 / 4 / 0 1 2 4 2 3 2 2 5 4 1 2 6 6 , 9 7 %

O M C 2 S W B S C 0 3 c e l l_ 1 2 1 5 / 4 / 0 1 2 7 3 3 2 5 6 1 1 4 5 6 , 2 9 %

O M C 2 S W B S C 0 4 c e l l_ 1 3 1 5 / 4 / 0 1 4 0 3 3 7 9 1 4 5 , 9 6 %

O M C 2 S W B S C 0 4 c e l l_ 1 4 1 5 / 4 / 0 1 2 7 3 3 2 5 7 3 1 3 4 5 , 8 5 %

O M C 2 S W B S C 0 2 c e l l_ 1 5 1 5 / 4 / 0 1 5 8 8 8 5 5 4 6 1 7 8 5 , 8 1 %

O M C 2 S W B S C 0 1 c e l l_ 1 6 1 5 / 4 / 0 1 4 3 7 7 4 1 2 3 1 8 8 5 , 8 0 %

O M C 2 S W B S C 0 1 c e l l_ 1 7 1 5 / 4 / 0 1 5 1 9 4 8 9 1 6 5 , 7 8 %

O M C 2 S W B S C 0 3 c e l l_ 1 8 1 5 / 4 / 0 1 1 9 4 7 1 8 3 6 7 6 5 , 7 0 %

O M C 2 S W B S C 0 2 c e l l_ 1 9 1 5 / 4 / 0 1 5 5 9 4 5 2 7 9 2 6 0 5 , 6 3 %

O M C 2 S W B S C 0 1 c e l l_ 2 0 1 5 / 4 / 0 1 1 1 1 1 5 1 0 4 9 1 5 1 3 5 , 6 1 %

O M C 2 S W B S C 0 2 c e l l_ 2 1 1 5 / 4 / 0 1 7 8 3 6 7 4 0 0 3 7 0 5 , 5 6 %

O M C 2 S W B S C 0 3 c e l l_ 2 2 1 5 / 4 / 0 1 7 6 0 0 7 2 0 9 2 9 6 5 , 1 4 %

O M C 2 S W B S C 0 1 c e l l_ 2 3 1 5 / 4 / 0 1 3 9 0 7 3 7 0 9 1 4 8 5 , 0 7 %

O M C 2 S W B S C 0 2 c e l l_ 2 4 1 5 / 4 / 0 1 3 2 2 3 0 6 1 3 4 , 9 7 %

O M C 2 S W B S C 0 2 c e l l_ 2 5 1 5 / 4 / 0 1 4 8 8 7 4 6 4 9 1 9 8 4 , 8 7 %

O M C 2 S W B S C 0 5 c e l l_ 2 6 1 5 / 4 / 0 1 3 3 5 3 3 1 9 1 1 3 2 4 , 8 3 %

O M C 2 S W B S C 0 1 c e l l_ 2 7 1 5 / 4 / 0 1 6 5 5 0 6 2 4 0 2 0 1 4 , 7 3 %

O M C 2 S W B S C 0 2 c e l l_ 2 8 1 5 / 4 / 0 1 5 1 6 4 4 9 2 3 1 8 0 4 , 6 7 %

O M C 2 S W B S C 0 2 c e l l_ 2 9 1 5 / 4 / 0 1 8 1 0 8 7 7 3 9 3 2 6 4 , 5 5 %

O M C 2 S W B S C 0 5 c e l l_ 3 0 1 5 / 4 / 0 1 4 0 6 7 3 8 8 8 1 2 6 4 , 4 0 %


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Real case of call assignment failure monitoring

ca ll_ass ig n _ fa ilu re

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30 worst ce lls

ca

ll a

ss

ign

me

nt

AS S IGN C MD

AS S IGN_FAIL


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Real case of handover failure monitoring

o m c N a m e B s c N a m e s e c t o rN a m e D a t e IN C _ H O _ IN TR A _ R E Q

IN C _ H O _ IN TR A

_ C M D

IN C _ H O _ IN TR A _

C O M P

IN C _ H O _ IN TR A _

R E T_ o n O L D IN C _ H O _ IN TR A _ F A IL _ R A TIO

n e t w o rk x x x x x x 1 5 / 4 / 0 1 7 7 4 9 9 7 5 7 9 3 7 1 3 2 1 3 9 7 2 5 , 9 0 %

O M C 1 D N B S C 0 1 c e l l_ 0 1 1 5 / 4 / 0 1 3 3 0 3 1 0 0 , 0 0 %

O M C 1 D N B S C 0 4 c e l l_ 0 2 1 5 / 4 / 0 1 8 4 5 8 4 5 1 4 1 6 9 4 8 3 , 3 1 %

O M C 1 D N B S C 0 4 c e l l_ 0 3 1 5 / 4 / 0 1 1 2 9 1 2 9 3 9 8 8 6 9 , 7 7 %

O M C 1 D N B S C 0 3 c e l l_ 0 4 1 5 / 4 / 0 1 3 6 3 6 1 3 2 3 6 3 , 8 9 %

O M C 1 D N B S C 0 3 c e l l_ 0 5 1 5 / 4 / 0 1 1 1 9 1 1 9 6 2 5 5 4 7 , 9 0 %

O M C 1 D N B S C 0 1 c e l l_ 0 6 1 5 / 4 / 0 1 9 9 5 4 4 4 , 4 4 %

O M C 1 D N B S C 0 1 c e l l_ 0 7 1 5 / 4 / 0 1 4 4 4 4 2 6 1 8 4 0 , 9 1 %

O M C 1 D N B S C 0 1 c e l l_ 0 8 1 5 / 4 / 0 1 3 3 2 1 3 3 , 3 3 %

O M C 1 D N B S C 0 1 c e l l_ 0 9 1 5 / 4 / 0 1 1 7 1 7 1 2 5 2 9 , 4 1 %

O M C 1 D N B S C 0 5 c e l l_ 1 0 1 5 / 4 / 0 1 1 5 6 1 5 6 1 1 2 4 4 2 8 , 2 1 %

O M C 1 D N B S C 0 3 c e l l_ 1 1 1 5 / 4 / 0 1 1 9 1 9 1 4 5 2 6 , 3 2 %

O M C 1 D N B S C 0 3 c e l l_ 1 2 1 5 / 4 / 0 1 1 4 6 1 4 6 1 0 8 3 5 2 6 , 0 3 %

O M C 1 D N B S C 0 4 c e l l_ 1 3 1 5 / 4 / 0 1 2 7 2 7 2 0 7 2 5 , 9 3 %

O M C 1 D N B S C 0 4 c e l l_ 1 4 1 5 / 4 / 0 1 2 4 2 4 1 8 6 2 5 , 0 0 %

O M C 1 D N B S C 0 2 c e l l_ 1 5 1 5 / 4 / 0 1 3 7 3 7 2 8 8 2 4 , 3 2 %

O M C 1 D N B S C 0 1 c e l l_ 1 6 1 5 / 4 / 0 1 6 6 6 6 5 0 1 6 2 4 , 2 4 %

O M C 1 D N B S C 0 1 c e l l_ 1 7 1 5 / 4 / 0 1 6 6 6 6 5 0 1 4 2 4 , 2 4 %

O M C 1 D N B S C 0 3 c e l l_ 1 8 1 5 / 4 / 0 1 1 7 1 7 1 3 3 2 3 , 5 3 %

O M C 1 D N B S C 0 2 c e l l_ 1 9 1 5 / 4 / 0 1 1 8 4 1 8 4 1 4 1 4 2 2 3 , 3 7 %

O M C 1 D N B S C 0 1 c e l l_ 2 0 1 5 / 4 / 0 1 1 3 1 3 1 0 3 2 3 , 0 8 %

O M C 1 D N B S C 0 2 c e l l_ 2 1 1 5 / 4 / 0 1 2 7 2 7 2 1 6 2 2 , 2 2 %

O M C 1 D N B S C 0 3 c e l l_ 2 2 1 5 / 4 / 0 1 5 1 5 1 4 0 1 0 2 1 , 5 7 %

O M C 1 D N B S C 0 1 c e l l_ 2 3 1 5 / 4 / 0 1 8 5 8 5 6 8 1 7 2 0 , 0 0 %

O M C 1 D N B S C 0 2 c e l l_ 2 4 1 5 / 4 / 0 1 2 5 2 5 2 0 5 2 0 , 0 0 %

O M C 1 D N B S C 0 2 c e l l_ 2 5 1 5 / 4 / 0 1 5 0 2 5 0 2 4 0 5 9 2 1 9 , 3 2 %

O M C 1 D N B S C 0 5 c e l l_ 2 6 1 5 / 4 / 0 1 1 6 1 6 1 3 2 1 8 , 7 5 %

O M C 1 D N B S C 0 1 c e l l_ 2 7 1 5 / 4 / 0 1 2 7 2 7 2 2 3 1 8 , 5 2 %

O M C 1 D N B S C 0 2 c e l l_ 2 8 1 5 / 4 / 0 1 6 5 6 5 5 3 1 1 1 8 , 4 6 %

O M C 1 D N B S C 0 2 c e l l_ 2 9 1 5 / 4 / 0 1 2 2 2 2 1 8 4 1 8 , 1 8 %

O M C 1 D N B S C 0 5 c e l l_ 3 0 1 5 / 4 / 0 1 2 8 2 8 2 3 5 1 7 , 8 6 %


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Real case for handover failure monitoringin c _ in tra _ H O _ fa il

0

100

200

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ce

ll_

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ce

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ce

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ce

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30 w o rst ce lls

ha

nd

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er f

ail

ure

s

INC _HO _INT R A_C MD

INC _HO _INT R A_C O MP


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5. Network capacity optimization


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Overall capacity optimization processcapacity audit

-load distribution on relevant boards

-CPU activity analysis

-capacity forecast

capacity audit

-load distribution on relevant boards

-CPU activity analysis

-capacity forecast

local optimization

-LAPD load balancing

-CPU activity troubleshooting

-capacity forecast

local optimization

-LAPD load balancing

-CPU activity troubleshooting

-capacity forecast

overall optimization

-site reparenting : BTS-BSC and BSC-MSC

-LAC repartitioning

-capacity forecast

overall optimization

-site reparenting : BTS-BSC and BSC-MSC

-LAC repartitioning

-capacity forecast

New equipment introduction

-HW and SW upgrade planning

-New equipment dimensioning

New equipment introduction

-HW and SW upgrade planning

-New equipment dimensioning

Forecasts

meet service

expectancies ?

Forecasts

meet service

expectancies ?

Forecasts

meet service

expectancies ?

END

END

END

NO

NO

NO


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6. BSS parameters optimization


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• Here is a part of the bts object, it contains

different kinds of parameters as specified

previously :

design parameter

system parameter

optimization parameter

operating parameter

product parameter

• During the optimization process, we will

essentially deal with changes on

optimization parameters

• note : many features in the system are

vendor-dependent and some of them may

affect the system performances the better we know the vendor equipments,

the better we can optimize

Example of a MOC with its parameters


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6.1. Terrestrial links optimization


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6.2. Radio procedures optimization

6.2.1. Cell selection

Reminder on cell selection procedureList of frequencies of the

selected PLMN

Eligible cell ? Selection of another

PLMN

C1 computation for best eligible cells

Suitable cell ?

Look for the cell with the best C1 in the suitable cells

IMSI Attach

Rejected ? PLMN set in the forbidden

PLMN listEnd of cell selection

no

no

no

yes

yes

yes

-cell of selected PLMN-cell not barred

-eligible cell with C1>0

C1 = rxLev-rxLevAccessMin-MAX [(msTxPwrMaxCCH - P),0]

rxLecAccessMin : min rxlev to

access to the cell

rxLev : signal level received by

the mobile from the cell

msTxPwrMaxCCH : max power

that MS can use to access on

RACH

P : max of MS power according to

its classmark

rxLecAccessMin : min rxlev to

access to the cell

rxLev : signal level received by

the mobile from the cell

msTxPwrMaxCCH : max power

that MS can use to access on

RACH

P : max of MS power according to

its classmark


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6.2.2. Access and paging channel control


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6.2.3. Communication supervision


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6.2.4. Radio measurement processing in dedicated mode


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6.2.5. Handover procedure


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6.2.6. Power control procedure


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One shot algorithm

no path compensation

partial path compensation

full path compensation

K = 0

0 <K < 1

K = 1

rxLev virtual

RXLEV

lRxLevXXP

transmitter receiver

Pmax

P

Pmin


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7. Examples of optimization actions at

network level


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Activating BS power control

handover evolution

0

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12000

14000

16000

16/1

1/04

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1/04

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1/04

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1/04

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1/04

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1/04

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1/04

28/1

1/04

29/1

1/04

time

ha

nd

ov

er

nu

mb

er

incoming intra BSC4

outgoing inter BSC3

outgoing inter BSC4


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Hardware failure detectionincoming handover intra failure ratio

0%

10%20%

30%

40%

15

/05

/04

22

/05

/04

29

/05

/04

05

/06

/04

12

/06

/04

19

/06

/04

26

/06

/04

03

/07

/04

time

ha

nd

ov

er

fail

ure

incoming handover intra fai lure

ratio

in c o m in g h a n d o v e r in tr a f a ilu r e r a t io

0 %

1 0 %

2 0 %

3 0 %

4 0 %

5 0 %

15

/05

/04

22

/05

/04

29

/05

/04

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/06

/04

12

/06

/04

19

/06

/04

26

/06

/04

03

/07

/04

t im e

ha

nd

ov

er f

ail

ure

han dove r fa ilu re

cell 308-1

cell 308-2

Documents

Chapter 1 2G Optimization and Planning