CDMA Optim.pptx

8/18/2019 CDMA Optim.pptx

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- 1 -

List of Contents

Executive Summary

Ⅰ. Introduction

1.1 Project Overview

1.2 Optimization Definition and Process

1.3 Quality Index

1. !or" Plan

Ⅱ. Detail Items of Optimization

2.1 #$ %elecom Optimization Process

2.2 Optimization Detail Items

Ⅲ. Case Study

3.1 #ystem &ardware Optimization

3.2 Parameter Optimization

3.3 Interference 'limination

3. Data %(rou)(put Improvement

3.* +actors for Data %(rou)(put De)radation

1-6

8,

- 11

12

13

1

1

1* 2/

!8

2,

2- 30

31

32 33

3



- ! -

1. Introduction

Definition " O#$ectives

1.2 Optimization Definition & Process

• Access network optimization is a series of activities for

1) maintainin t!e "est ca## $ua#it% #ower ca## drop and fai#ure rate' ood voice $ua#it%' etc)2) savin time and reducin investment cost t!rou! t!e radio enineerin

(ut' t!ere is no %ri&'t (ay) of access network optimization

• Optimization O"ectives are "e#ow

1) uarantee t!e ood ca## $ua#it%' 2) provide optimized coverae

*) increase s%stem capacit%' +) foundation materia#s for network e,pansion

• -!ere are t!ree stae in network optimization

1)

Precommercia#

• Ce## p#annin

• (-/ "asic test

• C#uster test

• 0etwork interation

2)

Commercia# #aunc!

*)Onoin

/%stem Optimization

• Acceptance test

• Coverae and !andoff contro#

• Parameter adustin

• Performance improvement

• -raffic "a#ancin

• -rou"#e s!ootin' etc



- * -

1. Introduction

Optimization +rocess,1

1. efore service launc'in&/ +re-commercial 0 Service launc' sta&e


Ce## P#an (asic -est C#uster -est Optimizationina#

Acceptance

Cutover

• Input

o##out p#an

-raffic forecast

Link "udet ana#%sis

-raffic ana#%sis

• Output

(-/ dimensionin

/ite ac$uisition

/imu#ation resu#t

• Input

Insta##ation

/imu#ation resu#t

Antenna orientation

• Output

/ta"i#ize s%stem 345

C!eck (-/ -4,

Antenna 6/5

7easure noise

C!eck ca## test

• Input

(-/ c!eck #ist

7ap data

• Output

Confirm coverae

3andoff contro#

(/C test

• Input

Drive resu#ts

parameter

(-/4(/C test resu#t

• Output

Compare 045 desin

Coverae c!eck

Adust Parameter

fter-Cutover

Optimization

+re-Cutover

optimization



- -

ie#d measurement & ana#%sis

Coverae"ad area) ana#%sis

Coverae over#a% ratio

Ca## $ua#it%drop and fai# rate)

ie#d measurement & ana#%sis

Coverae"ad area) ana#%sis

Coverae over#a% ratio

Ca## $ua#it%drop and fai# rate)

07/ data ana#%sis

/%stem t%pe 4 performance /%stem statistics ana#%sis

C4D rate' Ca## fai#' etc)

07/ data ana#%sis

/%stem t%pe 4 performance /%stem statistics ana#%sis

C4D rate' Ca## fai#' etc)

Optimization -aret

Coverae

Ca## $ua#it%

Optimization -aret

Coverae

Ca## $ua#it%

Decision for

Optimization met!od

Decision for

Optimization met!od

Coverae Improvement

/!adow & (ad area)

-raffic (a#ancin

site 4 sector "ased)

/%stem performance

improvement

Accomp#is!ment & 8va#uation

Issue "ased optimization

8va#uation for taret oa#

Accomp#is!ment & 8va#uation

Issue "ased optimization

8va#uation for taret oa#

Optimization resu#t

eed"ack for enineerin

Optimization resu#t

eed"ack for enineerin

• /%stem faci#ities c!eck •

/%stem t%pe c!ane• Parameter error correction• ecommendation

for 8nineerin

1. Introduction

Optimization +rocess,!

!. fter service launc'in&/ On-&oin& system optimization


-rou"#e s!ootin



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1. Introduction

3uality Index

1.* 9ua#it% Inde,

• Inde, ca#cu#ation

o Ca## /uccess ate :) ; Ca## /uccess Count 4 Ca## Attempt Count < 1== voice' data)

o Ca## Comp#etion ate :) ; Ca## Comp#etion Count 4 Ca## Attempt Count < 1==

o Ca## Drop ate :); Dropped Ca## Count 4 Ca## /uccess Count < 1==

o >ood coverae; 8c4Io ?; 12 d( & , power ?; @d(m & -, power B; 2= d(m

o Averae t!rou!put k"ps);

o Pendin ate :) ; Pendin Ca## Count 4 Ca## Attempt Count < 1==

< Definition w!en data t!rou!put is "e#ow k"ps durin 2= second

+endin& call

4oice Data

Ca## /uccess ate :) @ Ca## /uccess ate :) @

Ca## Comp#etion rate :) @ Ca## Drop ate :) 2

Ca## Drop ate :) 2 Pendin ate :) 2

>ood Coverae ate :) @ Averae -!rou!put k"ps) *2

∑

∑

sec)me Download%i

le#ize Download+i



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1. Introduction 1.+ 5ork P#an

5or +lan

/etup

• ie#d measurement• C9- ana#%sis• C9- report• Action p#an for opt.

C9- eport & Opt. Action P#an 7eport " +resentation

• Proect setup

• ick off meetin• 7/ reistration• Data ana#%sis

(-/ info.

Parameter

etc.

1st C9- 2nd C9-

Access 0etwork Optimization

• (-/ Opt.

/ite surve%

/imu#ation

C#uster opt.

P0 po##ution

etc.

• epeater Opt.

Insta##ation c!eck

Parameter c!eck

• Parameter Opt.

/%stem parameter

Access parameter

3andoff

0ei!"or #ist adust

etc• 2nd C9-• eport & Presentation

1st 5eek 2nd 5eek *rd 5eek E @t! 5eek 1=t! 5eek

0ote 1) C9- Ca## 9ua#it% -est

2) Opt. Optimization

Ⅰ)asic Data nalysis " C3 Ⅱ)Optimization ,System9 +arameter9 etc ⅢC3 " 7eport


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2. Detai# Items of Optimization

S; elecom Optimization +rocess

2.1 / -e#ecom Optimization Proces

/-A-Preparation)

/urve% & /imu#ation 0etwork 8va#uation

Optimization

-aret & 7et!od Decision

Optimization

8,ecution

Optimization 8va#uation

Performance

O"ectives F

80D

G8/

0O

Preparation (-/ info. & Parameter eview

o (-/ position' t%pe' output power' antenna info.

o PILO-HI0C' Pi#ot P0 Offset Distance' euse)

o Active4 0ei!"or4 emain /earc! window size

o 0ei!"or #ist & Initia# power

• /ite /urve% & /imu#ation

o Pi#ot 8c4Io' , power' -, adust p#ot

o

/oft !andoff reion

• 0etwork 8va#uation ie#d measurement & ana#%sis

o ie#d measurement wit! OC0/ forward)

o Ca## event ana#%sis

fai# and dropped ca##

sina# distri"ution 8c4Io' ,' -,HAd' etc)

• Deduce "ad $ua#it% area & ind Optimization

met!od

o 5eak sina# and P0 po##ution

o Parameter error

o 3ardware trou"#e' Interference' etc

• 8,ecution' 8va#uation and feed"ack


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Cell +lannin& 7evie(/ Site Survey

o Pictures 8,amp#es)

/ite ID /ite 0ame

/ite Address

/ite -%pe O74/8C-O' epeater

/ite operation and faci#ities c!eck

Ca## testOriination4-ermination' !andoff)' Parameters

/ite ma#function unit c!eck and repair

/!adow area and "ad $ua#it% area c!eck

/ite faci#ities c!eckconstruction environment)

Antenna information

Antenna t%pe' !ei!t' directionazimut!' ti#tin)

Coverae prediction

r"an' Indoor ' 3i!wa% and residentia# area

o Considerations for site surve%

• Ce## site information at!erin

C!eck items)

Operation environment

Operation status

Coverae & performance' etc.

• Ce## site information at!erin

C!eck items)

Operation environment

Operation status

Coverae & performance' etc.

/urve% &

/imu#ation

0etwork

8va#uation Optimization

• -o perform t!e surve% for a## desined and insta##ed sites If possi"#e)

2.2 Optimization Detai# Items


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. Detai# Items of Optimization

Cell +lannin& 7evie(/ Simulation 7esult,1

o orward -raffic 8c4Io P#ot

Pi#ot 8c4Io d() Distri"ution :)

8c4Io ?; J @.=@ :

1= B; 8c4Io B J 1K.1K :

12 B; 8c4Io B 1= 1*.K :

1+ B; 8c4Io B 12 J.== :

8c4Io B 1+ 2.=J :

-ota# 1== :

Averae Pi#ot 8c4Io .@ d(

o orward -raffic 8c4Io atio

< Prediction of >ood coverae 8c4Io ?; 12 d() J@.@J :

• CD7A s%stem orward Coverae criteria Pi#ot 8c4Io ?; 12 d( minimum)

• Ana#%sis esu#t

orward ood coverae a"out @=: averae Pi#ot 8c4Io ; K d()

Additiona# ce## site needed for indoor service in ur"an and dense ur"an areas

5eak /ina#

area

or 8,amp#e

/urve% &

/imu#ation

0etwork




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o 3andoff eion Ana#%sis P#ot

3andoff t%pe Distri"ution:)

0o 3andoff *K :

/ofter + :

/ofter/oft :

/oft * :

/oft/oft 1J :

-ota# 1== :

o 3andoff reion ratio:)

< Prediction of /oft !andoff ratio @ :

/oft 34O

ratio

• Ana#%sis esu#t

3andoff over#a% ratio is too !i!

Antenna t%pe and some parameters -HADD' -HDOP' -H-DOP' etc) !ave to "e c!aned.

3andoff (asic Parameter

-HADD 1+' -HDOP 1

3andoff (asic Parameter

-HADD 1+' -HDOP 1


Cell +lannin& 7evie(/ Simulation 7esult,! /urve% &

/imu#ation

0etwork


or 8,amp#e• CD7A s%stem reasona"#e soft !andoff ratio a"out *= E +=:



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>et(or Evaluation,1


/urve% &

/imu#ation

0etwork


• O"ectives

o Current 0etwork $ua#it% ana#%sis #oaded test)

o (ad Coverae ana#%sis & (ad Ca## 9ua#it% area ana#%sis "asic materia# for Optimization

o 8nineerin input data for e,pandin coverae or network rowt!eed"ack to enineerin part)

• 7easurement and Ana#%sis Items

?ood covera&e/ Ec@Io AB -1! d " 7x po(er AB -<2dm " x po(er B != dm

7easurement

-OOLCa## /cenario Ana#%sis Items

0etimizer

Ca## "% ca##77' 7L)' Continuous ca##77)

Ca## /cenario

6oice Id#eKsec)' Access2Jsec)' -raffic=sec)

Data Id#e1sec)' Access1Jsec)

Data transfer time2+=sec)

Data i#e size17)

Ca## success' comp#etion' fai# and drop rate

Coverae and ai# ana#%sis orward 8rame 8rror rate) 7o"i#e , Power' -, Power 7o"i#e -, Adust

3andoff ratio and ood coverae rate Data t!rou!put' etc




- 1! -

(4D7/ (-/4(/C PP

-P /erver PD/0

ie#d -est -oo#

(-/ 7/C

A/

7/

>et(or Evaluation,!


/urve% &

/imu#ation

0etwork


• -est Confiuration voice' data)

6oice

Data




- 1* -


S asic est,1/ asic +arameter 7evie( /urve% &

/imu#ation

0etwork


• (asic items to "e c!ecked

o (-/ information and 3ardware c!aracteristics 0ame' ID' P0 offset' -%pe' A and c!anne# e#ement

Antenna t%pe' swin and ti#tin deree' 6/5

o -aret service area of t!e "ase station and desin capacit%

• Parameter settins to "e c!ecked

o 0ei!"or #ist of eac! sector

o 3andoff parameter

o Access parameter

o -raffic c!anne# parameterDemodu#ation window)

o Active' 0ei!"or' emain searc! window size

o Power contro# parameter' etc

• (asic ca## test

o 7o"i#e to mo"i#e' mo"i#e to #and' #and to mo"i#e ca## test oriination & termination

o 3andoff test soft' softer and !ard !andoff if possi"#e)




- 1 -


S asic est,!/ Considerations /urve% &

/imu#ation

0etwork


•

P0 po##utiono Operator input error' Parameter #oadin error "etween (/7 and (-/.

o Ca"#e connection error "etween (-/ and antenna

• environment 4Condition c!eck

o sin rea# ca##' OC0/ and O0/

-!is is used in most ce## optimizations and fie#d tria#s. It is simp#e to set t!e OC0/' "ut is difficu#t to set t!e O0/. -o set O0/' t!e added output power dependin on t!e num"er

of usin ca##s s!ou#d "e measured first. A#so' t!e ot!er ce## interference s!ou#d "e considered




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/et t!e service area

ind t!e coverae s!adowin area 4 Indicate t!e s!adowin area on t!e map

un fie#d drive test

/et t!e (-/ transmit power and s%stem parameters

Optimize coverae

Define t!e !andoff area and optimize t!e !andoff reion

M (-/ power and antenna direction

(/C parameter and ensure forward and reverse #ink "a#ance

Optimize 8

Considerations

• >oa#

M verification re$uired "asic function' performance and network sta"i#it% t!rou! fie#d testc#assif% t!e c#uster)

Center Ce## 0ei!"or Ce##

C#uster


Cluster est /urve% &

/imu#ation

0etwork





- 16 -


>et(or Inte&ration,1 /urve% &

/imu#ation

0etwork


• Optimization -aret Area

o 5ea si&nal areaso Ca## drop areas

o Access fai#ure areas ca## fai#)

1) 5eak /ina# Area

Pro"#em

o C!eck -ransmit power

o C!ane antenna ti#t

o C!ane antenna azimut!

o C!ane t!e !ardware

Additiona# (-/ insta##ation

C!ane t!e !i! ain antenna Antenna dividin for scattered service reions

/o#ution




- 1: -


>et(or Inte&ration,! /urve% &

/imu#ation

0etwork



o 5eak sina# areaso Call drop areas

o Access fai#ure areas ca## fai#)

2) Ca## droop areas

Pro"#em

o Correct of window size errors

Adust searc! window size

Pream"#e and demodu#ation window #ent!

o C!eck t!e nei!"or #ist

7issin nei!"or #ist and

erroneous nei!"or #ist order o /et up !andoff parameter

Adust -ADD and -HDOP

o 3ardware trou"#e and unwanted noise

C!eck >P/ timin and /pectrum c#earance

/o#ution




- 18 -


>et(or Inte&ration,* /urve% &

/imu#ation

0etwork



o 5eak sina# areaso Ca## drop areas

o ccess failure areas ,call fail

*) Access fai#ure areas ca## fai#)

Pro"#em

o C!eck t!e access parameter

Pream"#e window #ent! and size

o 8,cessive IDL8 !andoff coverae adust

o 7/C' zone "order c!eck reistration

/o#ution




- 1< -


>et(or Inte&ration, /urve% &

/imu#ation

0etwork


• 3ardware and Parameter -rou"#e s!ootin

o ard(are trou#leo 3andoff and access parameter

1) 3ardware trou"#e

Pro"#em /o#ution

-%pe P!enomenon Optimization sc!eme

>P/ C#ock) 3andoff trou"#e wit! t!e nei!"or ce## C!eck >P/

Over!ead C!anne# Ca## setup trou"#e C!eck O3 c!anne#

Antenna 6/5 Coverae reduction

3i! -,Had a"ove N 1=d() Antenna rep#acement




- != -


>et(or Inte&ration,2 /urve% &

/imu#ation

0etwork


• 3ardware and Parameter -rou"#e s!ootin

o 3ardware trou"#eo andoff and access parameter trou#le

1) 3andoff parameter trou"#e

Pro"#em /o#ution

-%pe P!enomenon Optimization sc!eme

Poor IDL8 !andoff -emporar% 0O /86IC8 durin 34O 0ei!"or #ist c!eck

Poor /ofter 34O Occurs /5AP in same (-/ /45 amendment

Poor /oft 34O Ca## drop' etc 0ei!"or #ist and sina# c!eck

2) Access parameter trou"#e

Pream"#e window #ent! and pream"#e size

-raffic c!anne# parameters LOC' 0OHLOC' demodu#ation and ac$uisition window #ent!

7u#tipat! de#a% compensation




- !1 -

*. Case /tud%

System ard(are Optimization

o -aret /ite ian!an' wuz!on' in!e

o 3ardware ma#function & /45 "u

Item "efore after

8averae)

1.*2 =.+

• +ro#lem >otice/ ad voice uality

(efore After

• Solution/ C'annel card c'an&e " S@5

reset

*.1 /%stem 3ardware Optimization



- !! -

*. Case /tud%

+arameter Optimization/ Searc' 5indo( Size,1

• Averae 8 J.= drive route)

(efore

• (ad pi#ot 8c4Io in Active /et.

8ven t!ou! candidate set pi#ot strent! is ver% ood

"ut' It doesnt work t!e c!ane function

"etween active set and candidate set

• -oo !i! orward rame error rate7a,

1==)

• +ro#lem >otice/ Call Drop due to 'i&' FE7

*.2 Parameter Optimization



- !* -

*. Case /tud%

+arameter Optimization/ Searc' 5indo( Size,!

After

Item -aret Ce## /ite/earc! 5indow /ize

Active 0ei!"or emainin

8,istin va#ue (oao' !on%uan9ion!aitanmenQianfen9ion!ai)

1+*2= P0 c!ip) 1+*2= P0 c!ip) 1+*2= P0 c!ip)

Optimized va#ue 1=1== P0 C!ip) 111*= P0 C!ip) 111*= P0 C!ip)

• In case PILO-HI0C e$ua#s to *' 0ei!"or /earc! window size cou#dnt e,ceed t!e 121= P0 C!ip)

(ut' in "oao area' searc! window size is usedActive40ei!"or4emainin ; 1+)

-oo "i window size #eads to interference in active set and mo"i#e station can report t!e wron pi#ot sina#

• Solution/ C'an&e S7CG5I>G@>@7

FER Before After

0 ~ 1 74.8 93.5

1 ~ 2 0 0

2 ~ 5 9.0 5.7

5 ~ 10 4.9 0.3

10 ~ 100 11.2 0.5

Average 8.01 0.24

• 0o Ca## Drop and #ow 8

*.2 Parameter Optimization



- ! -

*. Case /tud%

e Elimination/ ccess fail due to 4 #ooster interference

A(-/

edia#

Ca## fai#

edia#

ca## fai#

• +ro#lem notice

Lon access time and ca## fai#

3i! mo"i#e -,HAd ain

• Solution ,+rocess

1. 3ardware c!eck resu#t 0orma#

2. everse Link c!eck

*. 0oise -racin wit! -oo#

+. 0oise detection and eason ana#%sis

eason noise due to -6 "ooster

. -rou"#e s!ootin & $ua#it% c!eck

• Connector mismatc! in -6 (ooster

• -6 (ooster c!aracteristics re$uenc%+K E J@= 73z)' >ain*= E += d()

*.* Interference 8#imination



- !2 -

• 7H+ Format and ?uard ime C'an&e

(efore LP ormat D' 2=ms42=ms >uard -ime After LP ormat C' 0o >uard -ime

-est environment 8c4Io R+d(' , Power Rd(m

Item i,ed 7o"i#e

(efore 11J.1 J*.K

After 12.+ JJ.+

Improvement J.* k"ps S) +.K k"psS)60

70

80

90

100

110

120

130T h r o u g h p u t ( k b p s )

Fixed Mobile

Before

After

• SCGFE7 +arameter C'an&e

In case /C3H8 sets to 1:' we can improve t!e data t!rou!put due to #essen t!e 8

-est environment 3i!wa% and oad

Item i,ed 7o"i#e

/C3H8 : 1=K. .J

/C3H8 1: [email protected] K1.

Improvement 2.* k"ps S) +.J k"ps S)60

70

80

90

100

110T h r o u g h p u t ( k b p s )

Fixed Mobile

SCH_FER 5%

SCH_FER 1%

*. Case /tud%

Data 'rou&'put Improvement,1

*.+ Data t!rou!put Improvement



- !6 -

• SC +arameter c'an&e

e#ated Parameter /C3HO/8-HC*H@==' /C3HO/8-HC*HnonA/ C!ane #ist /C3HO/8-HC*H@== = ? 2d(

/C3HO/8-HC*HnonA/ * ? = d(

5e can decrease t!e power a##ocation for specific data service "% c!anin a"ove parameter

it #eads to increase t!e data t!rou!put

Item 1st test 2nd test Averae

(efore . =. J.1

After =.J K.2 +.=

Improvement .2 k"ps S) .K k"ps S) .@ k"ps S)

50

55

60

65

70

T

h r o u g h p u t ( k b p s )

1t tet 2!d tet A"er#$e

Before After

*. Case /tud%

Data 'rou&'put Improvement,!

*.+ Data t!rou!put Improvement



- !: -

• ad 7F environment

CD7A2=== 1, s%stem determines t!e data rate wit! Data ate Decision A#orit!m durin 2=ms /c!edu#in period' / -e#ecom).efer to t!e "e#ow a#orit!m Data ate Decision a#orit!m)

SCH Power 9600 = FCH Power 9600 + SCH_OFFSET_9600 + OFFSET_HANDOFF

SCH Power = SCH Power 9600 + DB per data rate

Data rate decision ater co!parin" Ca#c$#ated SCH Power and A%ai#a&#e Power or SCH

In case of "ad environment' /%stem re$uires a !i! diita# ain and !i! power for orward c!anne#' so it occurs t!e power s!ortae. /%stem can not a##ocate t!e /C3

• ESC loss due to FC ad Frame

8/CA7 #oss due to "ad forward environment.

If /%stem cant receive 8/CA7' mo"i#e station doesnt demodu#ate t!rou!put; =)

• Data 'rou&'put De&radation in 'andoff re&ion

In case of P0 po##ution area' it !appens fre$uent#% Le C!ane for !andoff #ow data t!rou!put)

Improvement met!od

1) Lessen t!e Active count "% c!anin !andoff Parameter -HADD' -HDOP)

2) es!ape t!e coverae

*. Case /tud%

Factors of Data 'rou&'put de&radation

*. actors of Data -!rou!put Deradation



/ -e#ecom@@' /eorindon' Tonrou' /eou# 11=K2J' orea

-e# 0o J222121 *1KJ a, 0o J222121 R*@*2

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