(07)LTE Networking & Coverage Capacity Analysis

7/25/2019 (07)LTE Networking & Coverage Capacity Analysis

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Contents

Overview of LTE Wireless Network Planning

LTE Coverage Analysis

LTE Capacity Analysis

Conclusion



Introduce LTE into

Overall Network

Introduction

Strategy

Introduce LTE

into ey Areas

Advantage

Overall

network can receive LTE

service

!isadvantage

IntroducingLTE into re"ote areas will

waste t#e resource and

increase operation cost

Suggestion

It is not

necessary to introduce LTE

into overall network at t#e

early stage of network

construction

Advantage： Save t#e

resource and invest"ent

!isadvantage

Can not

ensure t#e continuouscoverage of LTE network

fringe areas

Suggestion$ Save t#e cost

and fit t#e developing

situation of #ig#%speed data

service

Strategy for Introducing LTE

&TE seriali'ed (ase stations support s"oot# upgrading to LTE) After network

operation* according to operator re+uire"ent or service re+uire"ent* upgrading

s#ould (e gradually conducted to support ,-.-/0 co%e1istence in an all%round way)



2ulti%carrier$ 3, su(%carriers co"pose one 456 "ultiple 45s (ear t#e

service6 over#ead and service are (orne and transi"itted on 45

2ulti%antenna Tec#nology$ T1 diversity* 41 diversity* /%antenna or

7%antenna (ea" for"ing and 2I2O SC2 tec#nology

2CS Tec#nology$ Adaptive "odulation and coding "et#od

8aria(le 5andwidt#$ 3)/29'* .):29'* ;29'* 3:29'* 3;29'* ,:29'1

2

3

4

C#aracteristics of LTE

3%. "ake LTE link and capacity "ore co"plicated



LTE Capacity Planning

LTE Coverage Planning

!eter"ine target coverage area* traffic "odel*

su(scri(er a"ount* coverage pro(a(ility

!eter"ine LTE networking strategy

<(and* ti"e slot and ti"e slot switc# point=

LTE Network Planning > ey Nodes



Traffic C#annel Co"parison in T!%SC!2A Evolution

TD-SCDMA

HSPA

LTE

• Traffic channel is dedicated channel

• The method of modulation and coding is fixed

• Traffic channel is shared channel

• Quick scheduling in time domain

• Adaptive Modulation Coding

• Traffic channel is shared channel

• Two-dimension scheduling in time domain

• Adaptive Modulation and Coding



Contents




Conclusion



Need to consider ?L-!L coverage

re+uire"ent differences

?nder t#e condition of e+ual

coverage range* ?L-!L cell edge

service rate is a(out 3$.

LTE Networking Planning > Coverage Planning

Traffic C#annel

Control C#annel

@or !L* need to consider coverage ranges of P5C9*

P!CC9* PC@IC9* P9IC9；

@or ?L* need to consider coverage range of P?CC9



Step 1 Step 2 Step 3 Step 5 Step 6

!eter"ine occupied (andwidt#

!eter"ine edge rate 1 k(ps

!eter"ine edge su(scri(ers 45 a"ount* n 45

!eter"ine ti"e slot allocation proportion

!eter"ine re+uired SIN4 as input value of receiver signal strengt# (udget

Step 4

LTE Coverage Analysis 2et#odology

!eter"ine trans"it-receive antenna type



• 4esource occupied (y cell%edge

su(scri(ers$ a"ount of 45

• Correlate wit# wireless

environ"ent B sc#eduling algorit#"

LTE Coverage Analysis 2et#odology > @i1ed 45 A"ount or SIN4

Su(scri(er 4ate

• Cell%edge Su(scri(er 4ate k(ps

• It can (e set

Su(scri(er 4esource SIN4

• 4e+uired SIN4

• !yna"ic and adaptive environ"ent

@i1ed 45 A"ount

SIN4 can (e calculated according torate re+uire"ent of cell%edgesu(scri(er and re+uired a"ount of4E fi1ed to (earing t#is rate service

@i1ed Carrier%to%Interference 4atio 5ecause LTE is dyna"ic and adaptiveenviron"ent* its unrealistic andunreasona(le to fi1 SIN4) @urt#er"ore*SIN4 division of LTE is very detailed*its difficult to value SIN4 re+uire"entof cell%edge su(scri(ers



!eter"ination of 45 A"ount 4e+uired (y Cell%edge Su(scri(ers

• According to syste"

si"ulation calculation* underco""on P@ sc#eduling*

3:29'* 3: su(scri(ers-cell*

corresponding statistical result

for t#e ;D worst cell%edge

su(scri(ers is a(out .)/%

/)/45) T#ere(y* ;45 is

reasona(le for setting)

• !etailed statistical results of

different scenarios are

certainly different) T#is value

directly correlates wit#

sc#eduling algorit#"

• In LTE link (udget

• @i1ed as ; 45 <Applica(le

for full (uffer service under

t#e condition of 3:29'%

,:29' (andwidt#=

• .%/ 45 <Applica(le for t#e(andwidt#≤;29'=

Syste" Si"ulation

Calculation Link 5udget

8aluation

!ifferent 45 a"ount received (y cell%edge su(scri(ers will cause

different coverage) T#is value "ust (e fi1ed in link (udget)

Ot#erwise* SIN4 cant (e o(tained)



eNode5 Allocation$

3%trans"it* ,%trans"it*

/%trans"it* 7%trans"it6

e?e Allocation$

3%receive* ,%receive* /%receive6

Support 2I2O !ou(le%strea"

2ode6

Support 5ea" @or"ing

If 2I2O dou(le%strea" "ode is effective

w#ile 5@ "ode is ineffective* eNode5 #as no

S@5C or 5@ gain)

If 5@ "ode is effective w#ile 2I2O dou(le%

strea" "ode is ineffective* antenna allocation is

/%trans"it or 7%trans"it* eNode5 #as no S@5Cgain (ut 5@ gain

If neit#er 2I2O dou(le%strea" "ode nor 5@<5ea" @or"ing= is ineffective* eNode5 can use

S@5C "et#od and it #as S@5C gain

No "atter 2I2O dou(le%strea" "ode is

effective* e?e can use diversity reception

"et#od and it #as diversity reception gain

Consideration for 2ulti%antenna > !L



e?e Allocation$ 3%trans"it*

,%trans"it* /%trans"it6

eNode5 Allocation$ 3%receive*,%receive* /%receive and 7%receive6

!ont support ?L 2I2O6

!ont support S@5C

eNode5 diversity reception gain correlates wit# t#e a"ount

of receive antennasIf eNode5 is 3%receive* diversity reception gain is :6

If eNode5 is ,%receive* diversity reception gain is .d56

If eNode5 is 7%receive* diversity reception gain is 7d5

No "atter #ow "any antennas are allocated for ?L e?e*

t#eres no trans"it diversity gain

<At present* t#e protocol doesnt support ?L 2I2O and

S@5C =

Consideration for 2ulti%antenna > ?L



Assu"ed Conditions of Coverage Analysis

仿真统计，在通用的 PF调度下， 10MHz、 10用户 /cell，边缘最差的 5用户对

Syste"Syste"Si"ulationSi"ulation

LinkLink5udget5udget

?nder co""on P@ sc#eduling* 3:29'* 3: su(scri(ers-cell

T#e ;D worst defined su(scri(ers are cell%edge su(scri(ers

Cell power a"plification allocation is /.d5"

5ot# of LTE and Wi2A are "ulti%carrier syste"s* (ut power

allocations are different6 for Wi2A* one "ore trans"it antenna*

one "ore power6 (ut for LTE* w#en antenna a"ount increases* t#e

power is s#ared a"ong all t#e antennas

Conversion relation (etween 4LC rate and 2AC rate$

4LC rate F 2AC rateGH:D

4eceiver noise floor calculation$

Integrate on t#e occupied 45 (andwidt#

C#annel over#ead$

A(out ,.%,;D* roug#ly speaking* . in 3/ ti"e slots are for over#ead



Control C#annel Coverage Analysis

Coverage%li"ited control c#annel is P!CC9



Traffic C#annel Coverage Analysis

@or ?L* traffic c#annel is li"ited) At t#e edge of control c#annel coverage*

,T1G,41 trans"it diversity can reac# //:* 7T1G,41 5@ can reac# H.;



Analysis of 5ea" @or"ing Influence on Coverage

Influence onLTE T!! ?L Coverage$

Wit# t#e increasing of receive

antenna a"ount* cell ?L

coverage is graduallye1panding

5ea" for"ing "ainly ai"s at

/%antenna and 7%antenna

reception

Influence on LTE T!! !LCoverage$

W#en dou(le%strea" 2I2O and

5@ are not open* !L coverage

range is gradually e1panding wit#t#e increasing of trans"it or

receive antenna a"ount

W#en 5@ is open* due to

introduction of /%antenna or 7%

antenna for"ing gain* coverage is

evidently (etter t#an coverage

range wit#out 5@) 2eanw#ile* 7%

antenna 5@ coverage is (etter

t#an /%antenna 5@






Conclusion

Contents



@actors

Influencing

Capacity

BB

EE

CC

DD

AA

E+uip"ent

Perfor"ance<Syste" 5andwidt#*

Trans"it Power* ?E

Perfor"ance=

Environ"ent

2I2O

Sc#eduling

Algorit#"

Interference

Eli"ination

LTE Network Planning > Capacity Planning



LTE capacity planning "et#od cant (e conducted according to 4/

traffic capacity planning "et#od

5ecause t#ere are too "any factors influencing capacity planning*

for"ula cant (e used for calculation

T#roug#put under t#e conditions of various allocations and pat#

losses can (e o(tained (y si"ulation and actual "easure"ent

e1perience

In actual planning* c#eck t#e for" to confir" LTE capacity

according to t#e detailed condition of planning area

LTE Network Planning > Capacity Planning 2et#od



Contents




Conclusion



Conclusion

• !istri(uta(le resource is 45) It needs to (e used wit# edge rate

re+uire"ent to confir" SIN4

• 2ulti%antenna tec#nology is co"plicated) Pay attention to t#e

differences a"ong trans"it diversity* diversity reception and

2I2O dou(le%strea" gain

• LTE often uses trans"it diversity S@5C "ode at cell edge and itdoesnt use 2I2O "ode6 S@5C-2I2O only e1ists in !L (udget

• 5ecause LTE is "ulti%carrier syste"* diversity gain #as evident

advantage (y co"parison wit# T!%SC!2A and ot#er (road(andsyste"s6 LTE #as evident advantage in !L-?L (y co"parison

wit# T!%SC!2A coverage

• Noise of receiver is calculated fro" 45 a"ount integration6 t#ere

#as (een no final conclusion of ?L-!L residual interference up to

now6 its generally recogni'ed t#at application of ICIC and ot#er

advanced interference algorit#"s can greatly decrease it

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(07)LTE Networking & Coverage Capacity Analysis

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