g-delivery guide to optimization of gsm paging success rate-20061230-a-1.0.doc

8/14/2019 G-Delivery Guide to Optimization of GSM Paging Success Rate-20061230-A-1.0.doc

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Delivery Guide to Optimization of GSM Paging Success Rate For internal use only

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Delivery Guide to Optimization of GSM Paging

Success Rate

(For internal use only

Prepared by "ang #uzai Date Dec $!% $!!&

Revie!ed by GSM tec'nical support team

of radio net(or) planning

Date Dec $*% $!!&

Revie!ed by Date

"pproved by Date

+ua(ei ,ec'onologies -o% .td

"ll rig#ts reserved$

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Revision %istory

Date Revision version Description "ut#or

Dec $!% $!!& V1! ,'e first draft (as completed "ang #uzai

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Table of &ontents

' Overvie!$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

) Definition of Paging Success Rate$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

* "pplication Strategy of Paging Success Rate$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$+

, Related Factor "nalysis and -mprovement Measures of .SS$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$+

Related Factor "nalysis and -mprovement Measures of /SS$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$0

+ "ppendi12 Paging Signaling Flo! art$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$''

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Delivery Guide to Optimization of GSM PagingSuccess Rate

3ey!ords

GSM% paging success rate% application strategy% and optimization strategy

"bstract

,'is document descri2es several current definitions a2out t'e paging success rate% differences

2et(een t'e definitions% and calculation formula and meaning of eac' definition 3ts content also

includes t'e application strategy and optimization strategy of t'e paging success rate 3ts appendi4

descri2es t'e paging process

Reference list

S/ Document name "ut#or Publis#er Date

1 GSM 5ireless Net(or) Planning

and Optimization

+ua(ei People6s Post and

,elecommunication

s Pu2lis'ing +ouse

7une $!!8

$ 3ntroduction to GSM and 3tsNet(or) Optimization

+an9in:ie

Mec'anical 3ndustryPu2lis'ing +ouse

;ugust $!!1

/ ,raffic Statistics Manual of

M*!!V&!&?

+ua(e

i

0 $!!&

8 Data -onfiguration Reference

of M*!!V&!?

0 $!!&

Guide to Net(or) Pro2lem

Solution of G0P-+ Overload

+ua(e

i

0 $!!&

& AP3 9aseline of GSM Radio

Net(or) >V1/=?

+ua(e

i

0 $!!&



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' Overvie!

Paging is a 2asic function in t'e mo2ile communication system ,'e paging success

rate is an important item of measuring (ireless net(or) Buality 3t is also an important

appraisal item of operator

,'is document descri2es several current definitions a2out t'e paging success rate%

differences 2et(een t'e definitions% and calculation formula and meaning of eac'

definition 3ts content also includes t'e application strategy and optimization strategy

of t'e paging success rate 3ts appendi4 descri2es t'e paging process

,'e descriptions in t'is document are 2ased on t'e version of GSM 9S-

V/!!R!!$-1/

) Definition of Paging Success Rate

)$' /SS Definition

Paging success rate 4 Paging responses 5Paging re6uests 1 '778

Paging responses

DefinitionC refers to t'e total responses to t'e P;G3NG RS messages received 2y all

t'e MS-s in t'is area% including t'e responses to repeated paging messages ,'e

measurement point is MS-

Paging re6uests

DefinitionC refers to t'e sum of initial P;G3NG messages >e4cluding repeated paging

messages? sent 2y all t'e MS-s in t'is area ,'e measurement point is MS-

)$) .SS Definition&ircuit paging ("9interface success rate (8 4 Successful circuit pagings of

"bis interface 5 Received circuit paging messages from MS&

Successful circuit pagings of "bis interface

DefinitionC ;fter receiving an S,;9.3S+ 3ND3-;,3ON message (it' t'e cause value

P;G3NG RSPONS from an MS% t'e 9S- measures t'is item% including t'e

responses to repeated paging messages

Received circuit paging messages from MS&

DefinitionC ;fter receiving a circuit service P;G3NG message from ; interface or P2

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interface >+ua(ei 9S-0P-E internal interface?% t'e 9S- measures t'is item%

including repeated paging messages

* "pplication Strategy of Paging Success Rate

*$' Paging Success Rate of /SS and .SS

,'e numerators of t'e t(o formulas are t'e sameC paging responses ,'ey differ in

t'e denominators ,'e denominator in t'e formula of NSS paging success rate is

initial paging messages e4cluding repeated ones ('ile t'at of 9SS paging success

rate is all paging messages including repeated ones Vie(ed from t'e t(o formulas%

t'e NSS paging success rate is larger t'an t'e latter

*$) Difference .et!een Definitions of Different Operatorsand :endors

Different operators and vendors define t'e same paging success rate

*$* "pplication Strategy

Generally% operators or vendors ta)e t'e NSS paging success rate as a net(or)

appraisal item ,'e 9SS paging success rate is :ust a net(or) reference item

, Related Factor "nalysis and -mprovement

Measures of .SS

,$' Related Factor "nalysis of .SS

3mprovement of paging success rate is a system0level pro2lem% involving factors of

many aspectsC

9,S coverage

Signaling c'annels congested or not

Rationality and up0do(n lin) 2alance of location area >.;? division

Setting of paging related parameters suc' as up0do(n lin) access t'res'olds

>R"&% Min$ "ccess ;evel and R:="&&>SS=M-/? and Periodical

location updating timer>,/$1$?

Mo2ile p'one Buality

;nd so on

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,'e measures put for(ard in t'is guide are 2ased on t'e supposition t'at t'e net(or)

items are normal and t'ere are not t'e a2ove pro2lems in t'e net(or) For t'e

analysis and solution of t'e a2ove pro2lems% see relevant guides

,$) Related Traffic Statistics "nalysis of .SS

Generally% some 9S- traffic statistic items are relative to t'e paging success rate

Random ;ccess Measurement FunctionC -ircuit paging P-+ overloads of ;2is

interface and -ircuit paging R;-+ overloads of ;2is interface

SD--+ Measurement FunctionC ;ttempted SD--+ seizures meeting SD--+

overflo( >? and SD--+ call drop rate >?

,$* .SS Measures of -mproving Paging Success Rate,$*$' Properly Reducing ?R"&% Min$ "ccess ;evel?

Setting suggestion2,'e parameterR"&% min$ access levelis generally set to 1

,'e lo(est value can 2e !% denoting no limit to t'e uplin) access level ,'e lo(er

setting value is more favora2le for improving t'e paging success rate

NoteC Reducing t'e minimum R;-+ access level may cause t'e increase of ,-+ call

drop rate "ou can mitigate it 2y increasing t'e R:9"&&>SS9M-/or s'ortening

t'e MS- timer ,/!SS9M-/ denotes t'e minimum

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received signal level needed 2y t'e MS access system ,'e default value is = ,o

improve t'e paging success rate% you can properly reduce t'is parameter ; too lo(

value of t'is parameter (ill also cause t'e increase of call drop ,'erefore% you need

to ta)e measures to optimize call drop

,$*$, Properly -ncreasing ?MS Ma1 Retrans?

Setting suggestion2,'e default value of MS M"< retrans is 8 ,o improve t'e

paging success rate% you can set it to H 2ut you need to pay close attention to t'e

R;-+ load

,'eMS M"< retrans>in t'e System 3nformation ,a2le? denotes t'e upper limit of

-'annel ReBuest messages t'at an MS is allo(a2le to send in an immediate

assignment process ,'e larger t'e value is set% t'e 'ig'er t'e success rate of callattempt is% 2ut t'e 'eavier t'e R;-+ load 2ecomes

,$*$ >nabling .TS Function of Resending Paging Messages

Setting suggestion2-'ange t'e Paging timesin t'e -ell ;ttri2ute ,a2le to ena2le

t'e 9,S function of resending paging messages 3t is recommended to set t'e

parameter to 8

,o improve t'e paging success rate and paging efficiency% (e add t'e function of

resending paging messages to t'e 9,S ,'us% (e can solve some MS pro2lems

temporarily failing to receive paging messages correctly% ('ic' result from sporadic

poor (ireless lin) transmission ;s for t'ose result from constant poor (ireless lin)

transmission% 'o(ever% t'e solution depends on t'e paging message resending of

MS- ;ny(ay% t'e 9,S actualization of resending paging messages reduces t'e

resending load of MS-% and lessens t'e signaling load of t'e ('ole net(or) to a

certain e4tent

,$*$+ /et!orA &overage >ffects on Paging Success Rate

Poor net(or) coverage may cause t'at some MSs fail to 2e paged in a dead zone

and affect t'e paging success rate

,$*$B @p9Do!n ;inA .alance >ffects on Paging Success Rate

Serious up0do(n lin) im2alance may also affect t'e paging success rate 3f t'e

do(nlin) is poor% MSs may not receive any Paging ReBuest message 3f t'e uplin) is

poor% t'e 9,S may not receive any Paging Response message from an MS "ou can

identify ('et'er some cells suffer t'e pro2lem of serious up0do(n lin) im2alance from

t'e traffic statistic items of Ep0Do(n .in) 9alance Measurement Function

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,$*$C ;" Division >ffects on Paging Success Rate

Enreasona2le .; division may also affect t'e paging success rate

Suggestions on .; divisionC

,'e scope of .;- must 2e under an MS- -ross0MS- is not allo(a2le

,'e .;- size must 2e rational to avoid paging overload

Pay attention to t'e 2alance 2et(een paging messages and location updates

;void dividing .;-s along main roads and rail(ays Ot'er(ise% t'is (ill cause

freBuent location update of MS

,ry to allocate even paging messages to eac' .;-

Decide .;- 2orders 2y com2ining (it' 'andovers% traffic% and 9S- 'ome

,$*$0 Ot#ers

,'e parameters .S="G=.;3S=R>Sand .S=P"=MFR"M>Salso affect t'e paging

success rate Please set t'em rationally pursuant to data configuration specifications

.S=P"=MFR"M>S2 For 9,S/#% set it to $ ;t t'is time% t'e air interface of

eBuipment sends paging messages most efficiently and t'e paging capacity is t'e

largest For 9,S$#% set it to or &

.S="G=.;3S=R>S2 Generally% set it to 1 3f paging messages are Buite a lot% set it

to !

NoteC 5'en setting t'is parameter to ! or 1% you must ena2le t'e priority function

of immediate assignment ,'at is% c'ange parameter 1= in t'e 9,S soft(are

parameter ta2le into $$

3f t'e system is sending a system message on t'e e4tended 9-+ or configuring a

-9-+ or N-+ >GSM0R?% it is not allo(a2le to set t'is parameter to !

Related Factor "nalysis and -mprovement

Measures of /SS

Generally% you can optimize t'e paging success rate of NSS 2y ad:usting t'e paging

strategy t'roug' t'e follo(ing parametersC

Paging times

Paging intervals

Paging mode

Paging scope

3MS3 implicit detac' timer

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$' Paging Times and Paging -ntervals

Setting suggestionC Set t'e Paging timesto / For ur2an areas% set t'e Paging

intervalsto & s% s% and s% and & s% = s% and & s for su2ur2 areas

For an .; (it' a large capacity% a paging message s'ould not 2e resent for too many

times and t'e resending interval s'ould not 2e too s'ort Ot'er(ise% t'is may cause

9,S overload% 9S- -PE overload% and t'en discarding of many paging messages

;s a result% t'e paging success rate falls s'arply

3n addition% if you set a too s'ort paging resending interval% t'e MS- may regard it as

pre0paging failure and clear paging information ('en failing to receive a paging

response (it'in t'e specified paging times ;fter t'at% even if t'e paging response

arrives% t'e MS- sends a -.;RI-OMM;ND to release t'e called party6s (ireless

c'annel 2ecause t'e paging information is cleared

$) Paging Mode (TMS- Paging or -MS- Paging

Setting suggestionC Ese ,MS3 paging for t'e first time 2ut 3MS3 paging for t'e

second and t'ird times

3n t'eory% t'e efficiency of ,MS3 paging is t(ice as muc' as t'at of 3MS3 paging

,'erefore% using ,MS3 paging can increase t'e paging capacity of P-+

For a net(or) (it' its P-+ nearly or already overloaded% using ,MS3 paging can

mitigate P-+ overload ,MS3 paging may cause some temporarily errors t'at result in MS response

failure ,'erefore% use ,MS3 paging for t'e first time 2ut 3MS3 paging for t'e


NoteC 5'en using ,MS3 paging% you must ena2le t'e aut'entication for location

update

$* Paging Scope (Paging by ;"& or in t#e #ole /et!orA

Setting suggestionC Generally% t'e first paging and second paging are performed 2y

.;- ,'e last paging s'ould 2e set according to facts

Paging in t'e ('ole net(or) 'as great impact on t'e system load of 9S- and easily

causes P-+ overload

3n dense ur2an areas% t'e coverage area of eac' .; is relatively smaller and cross0.;

location update occurs to users more easily ,'erefore% t'e last paging in t'e ('ole

net(or) (ould 'ave an o2vious effect 3n 2oundary net(or)s% t'e coverage area of

eac' .; is larger and cross0.; location update seldom occurs to users ('o are

usually in t'e same .; 3n t'is case% paging in t'e ('ole net(or) (ould not 'ave an

o2vious effect 3f t'e P-+ is nearly or already overloaded% use paging 2y .;- for t'e


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$, -MS- -mplicit Detact Timer of MS&

Setting suggestion2 ,'is parameter must 2e larger t'an t'at of 9S- 2y to 1!

minutes

3t is a 'elpful (ay of improving t'e paging success rateC properly reducing t'e 3MS3

implicit detac' time of MS- and setting t'e periodic location update timer ,/$1$ of

9S- to 2e a little less t'an t'e 3MS3 implicit detac' time of MS- ;fter t'e MS-

detac' timer e4pires% t'e V.R (ill set t'e MS in t'e coverage dead zone or in t'e

po(er0off state to implicit po(er0off ;t t'is time% t'e MS- does not send any paging

message

5'en reducing t'e location update time of 9S- and t'e 3MS3 implicit detac' time of

MS-% you must ensure t'at no signaling overload (ill occur

+ "ppendi12 Paging Signaling Flo! art

,'e figure 2elo( s'o(s t'e signaling flo( of GSM paging process ,'e paging

process involves multiple net(or) elements >Ns? suc' as MS-% 9SS% and MS

,'erefore% t'e optimization of paging success rate needs t'e cooperation of multiple

Ns


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