the gsm special subject optimization case

7/17/2019 The GSM Special Subject Optimization Case

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The GSM special subject optimization caseThe SDCCH assign

Mobile Network Planning&Optmization dept



Course purpose

Finish study origin a course, you will can

Control de!inition and optimization strategy o! the distribution inde"

sign o! the business channel

Control de!inition and optimization strategy o! calling drop inde" sign

Control de!inition and optimization strategy o! obstruct the inde" sign



Catalogue

The SDCCH assigns success rate



#perator$s inde" sign de!ine

The SDCCH assigns success rate%

The success number o! times& SDCCH o! the

SDCCH distribution assigns re'uest number o! times()**+

The signaling channel

assigns success rateThe inde" sign de!ine

SDCCH

ssign success number o! times-

decide

.statistics point

SDCCHDoes the distribution assign re'uest number o! ti

decide

statistics



The computation !ormula that the /T0 system

correspond

The SDCCH assigns success rate%)1 C)*))2& C))3*4

The TCH channel assigns

success rateThe inde" sign de!ine

C)*))2

De!ine an and

computation

!ormula

C))3*4

De!ine an and

computation

!ormula



The inde" sign o! /T0 system e"plain


success rateThe inde" sign de!ine

e!uest a channel to arri"e the whole procedure which takes

up a SDCCH channel in the Ms# namel$ the signaling

procedure sends out a channel re!uest a message a

beginning %rom the MS# arri"e SC to recei"e 'stablish

indication a message be o"er and is di"ided into the %ollowing

( part

e!uest a channel to arri"e the whole procedure which takes

up a SDCCH channel in the Ms# namel$ the signaling

procedure sends out a channel re!uest a message a

beginning %rom the MS# arri"e SC to recei"e 'stablish

indication a message be o"er and is di"ided into the %ollowing

( part

The channel

ta5e up

The channel

distribution

The channel

assign



The SDCCH channel ta5es up

!ailure6congestion7


success rate#ptimization strategy



The SDCCH channel ta5es up !ailure6congestion7 reason and

sol8es a method



) Tra%%ic densit$ is big# outrun the

design capacit$ o% S*) The +,C planning isn-t reasonable.

) The wireless parameter set not

reasonable.

) '!ual de%inition o% not reasonable

result in o% ping/pong location

update and ping/pong hando"er*

) Once o"ercast greatl$# e0ist

isolated island phenomenon.

The main reason o! the

SDCCH congestion

)Check a wireless parameter

setup.

)Pass the %ield strong test# testing#

anal$ze whether once o"ercast big#

the e0istence isolated island

phenomenon.

)Congestion %rom tra%%ic densit$1ao cause# check con%iguration and

TCH tra%%ic o% the SDCCH channel#

appropriate ad2ustment channel

con%iguration

Treatment o! the SDCCH

congestion



The SDCCH channel

distribution !ail





The distribution failure of the SDCCH channel reason and solve a

method

Note:Here the signaling is to walk the wired channel of the

ABIS interface general the success rate be ver! high"above

##$#%&



The main reason o! SDCCH

distribution !ailure

The row checks to transmit a%ailure*

The row checks a S

hardware to transmit*

The row checks s$stem

so%tware ug*

The SDCCH assigns

treatment o! !ailure

Transmit a %ailure#

such as transmit

mistake code 1ao#

nonsked interrupt etc.*

'!uipments hardware

%ault.3% the T4 break

down*

S$stem so%tware ug*



The SDCCH channelassignment !ail





The assignment !ailure o! the SDCCH channel reason and

sol8e a method



Hardware %ault.

The same %re!uenc$ perhaps

neighbor %re!uenc$ inter%erence.

The antenna s$stem appears a

%ailure.

The parameter isn-t

reasonable.

The ,bis inter%ace transmits a

%ailure.

The main reason o! the

SDCCH congestion

Check the cell wireless parameter set

whether reasonable*

Check inde0 signs# such as ' and

spare time inter%erence tape grade...etc.#

let up to remo"e a wireless inter%erence*

Check a cell hardware*

Check an antenna s$stem*

The row checks to transmit a %ailure*

Treatment o! the SDCCH congestion



The case one some system 9SC4 descends SDCCH distribution$s success rate low

9rea5 down phenomenon The SD which passes the cheer!ul 9SC4 in the analysis detection o! the per!ormance

inde" sign assigns success rate lower, particularly at night !a8our 8ery low, only 3*+ is

or so:

Fault analysis

;assing an #MC< per!ormance inde" sign analysis, disco8ering is the whole 9SC todescend all distribution success rate o! the cell SDCCH low, and SDCCH congestion the

rate be not high, only is *:*=+, mainly is wireless SDCCH assignment !ailure rate big:

Further disco8er that the MSC> descend the SD assignment o! all 9SCs6include the 9SC

o! Siemens7$s success rate all only 3*+ be or so, and the paging success rate o! the

MSC> be also 8ery low:The personnel understands MSC> ne"t only a ?C !rom the unioncommunication, because o! paging need to descend all cells to carry on a paging to the

?C, along with the aggrandizement o! tra!!ic, paging the 'uantity also enlarges:


success rateTypical model case



The case one some system 9SC4 descends SDCCH distribution$s success rate low

Fault handling The union communication personnel moderates Siemens that direction to increase a ?C

zone !or MSC>, under parts o! 9SCs6Siemens7 o! the ?C number o! cell replace !or the

new ?C number:Should operate on March )4 to carry on in the e8ening:March @o:)A

9SC4 descends the SD assignment success rate reco8ery normal, arri8e abo8e B2+:

The empress o! the !ault handling



Tim

e

#bject

identi!icati

on

The signaling

channel

congestio

n rate6+7

The signaling

channel tries

to shout total

number o!

times

The signaling

channel

o8er!low

s total

number

o! times

The SDCCH

assigns

success

number

o! times

The SDCCH

assigns

!ailure

number

o! times

The SD

assigns

success

rate

3月 10日 sc( 5.56 787799 :; ;:<<= 86=99 56.25%

3月 11日 sc( 5.56 78(8=6 8< ;8=;6 898;: 56.36%

3月 13日 sc( 5.59 79=<8< =8 =:885 87(8( 54.87%

3月 14日 9sc4 * )*2)A2 2 )***2 2*A2 95.20%

3月 15日 9sc4 * )*))> * B>34 4*A2 97.01%



Case twoThe distribution success rate o! the Spice SDCCH in ndia is low

9rea5 down phenomenon

High !ailure rate problem o! the SDCCH assignment o! northern ndia S;C0 is

consistently done not resol8e and whole netses$ much the assignment !ailure

rate o! the cell SDCCH is more than =2+ and the user is 8ery dissatis!ied and

se8erely re'uest to resol8e:

Fault analysis

;ass by analysis detection, the networ5 e"ists a lot o!ly and together ;in and

9SC to cause:



>ault handling

easonable planning S3C# a"oid the same %re!uenc$ the same

,S3C# the problem resol"e.

the gsm special subject optimization case

Documents

sdcch channel assignment

sdcch channel distribution

sdcch channel reason

partthe sdcch channel

wired channel

success number of times

sdcch congestioncheck

distribution index sign