lte air performance

8/18/2019 LTE Air Performance

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TD-LTE Air Performance(KPI Test)

& Optimization

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Contents

- LTE Overview

- KPI for LTE

- Optimization

2


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LTE Overview


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LTE System Architecture Evolution


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LTE Channel Banwith

FrequencyRange UMTS FDD bands and UMTS TDD bands

ChannelBandwidth,1Resource

Block RB! "1#$%&'

1.4MHz 3MHz 5MHz 10MHz 15MHz 20MHz

6 RBs 15RBs 25RBs 50RBs 75RBs 100RBs

Modulationsche(e

Downlink: QPSK, 16QAM, 64QAMUlink: QPSK, 16QAM, 64QAM !o"ion#l $o% n's(")

Multi)le*ccess

Downlink: *+DMAUlink: S-+DMA

M+M- %#ns/i" 'i(%si", li '(l# 'i(%si" !M#. 4#n"(nn# #" B#s( s"#"ion #n' n's(")- S#"i#l /l"il(in, Ml"is(% MM*


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LTE !esource "ri


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FDD-LTE frame structure (type1)

TDD-LTE frame structure (type2)

-$ -1 -. -/ -1# -10

1 radio ra(e T " /$2.$$3Ts " 1$ (s!

1 slot Tslot " 14/5$3Ts " $64 (s!

1 subra(e 1 (s!

-$ -. -/ -7 -4 -2 -# -0

1 subra(e /$2.$3Ts " 1 (s!

1 hal8ra(e 14/5$$3Ts " 4 (s!

1 radio ra(e T " /$2.$$3Ts " 1$ (s!

1 slot Tslot " 14/5$3Ts " $64 (s!

9uard )eriodDw:TS U):TS

LTE #rame Structure


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TDD-LTE

▪ Special subframe : provide guard time for DL-to-L s!itc"i#g

▪ Si#gle carrier fre$ue#cy

FDD-LTE

▪ T!o carrier fre$ue#cies for L tra#smissio# a#d DL tra#smissio#

▪

L a#d DL tra#smissio# ca# occur simulta#eously

Transmission in LTE


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%"ysical Sig#als

Sy#c"ro#i&atio# sig#al (SS)▪ 'c$uire fre$ue#cy a#d symbol sy#c"ro#i&atio# to a cell

efere#ce sig#al (S)▪ %rovide for c"a##el estimatio# bet!ee# E a#d e*

▪ %erforms as pilot sig#al for co"ere#t detectio#

Downlink Ulink

R($(%(n( sin#l!RS)

(ll-s(i RS U8-s(i RS MBS+9 RS

D(/o'l#"ion RS Son'in RS

Sn&%oniz#"ion sin#l!SS)

P%i/#% SS S(on'#% SS

-

LTE Physical Si$nals


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Sy#c"ro#i&atio# sig#als : %SS+ SSS

T"e detectio# of t"ese t!o sig#als

▪ E#ables time a#d fre$ue#cy sy#c"ro#i&atio#

▪ %rovides t"e E !it" t"e p"ysical layer ide#tity of t"e cell

▪ %rovides t"e cyclic prefi, le#gt"

▪ #forms t"e E !"et"er t"e cell uses FDD or TDD

Tra#smitted periodically+ t!ice per 1.ms radio frame

t"e %SS a#d SSS are tra#smitted i# t"e ce#tral si, *s

%/D (. 0 .) 3 4SSS 5 %SS

▪

%SS : .+ 1+ 2▪ SSS : .+ 1+ 2+ 6 + 178

Sy#c"ro#i&atio# sig#als # TDD cell

T"e %SS is located i# t"e t"ird symbol of t"e rd a#d 1t" slots

T"e SSS is located t"ree symbols earlier

T"e precise positio# of t"e SSS c"a#ges depe#di#g o# t"e le#gt" of t"e /% !"ic" is c"ose#for t"e cell

LTE Synchronization si$nals


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9appi#g of DL efere#ce Sig#als

Tra#smitted i# every DL subframe

sed for c"a##el estimatio# for co"ere#t demodulatio# of a#y do!i#li# tra#smissio#

/ell-specific refere#ce sig#als i# case of multi-a#te##a tra#smissio#

/ell-specific Ss are staggered !it" Si, possible fre$ue#cy s"ift

LTE !eference si$nal

;:SS ;:SS ;:SS


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S% ;d*m< : efere#ce Sig#al eceived %o!er

'bsolute value+ #ot related to %ayload

SS ;d*m< : eceived Sig#al Stre#gt" #dicator

Directly proportio#al to %ayload

S= ;d*< : S%>SS ratio

#versely proportio#al to %ayload

si#g for "a#dover of cell loadi#g

LTE %easurement Items


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LTE Call Setup Proceure


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DL T, %o!er

e* T, 'tte#uatio#

%o!er ?ptio# (%'+ %*)

L T, %o!er ?pe# Loop %o!er /o#trol

▪ /ompe#sate %ass Loss

/losed Loop %o!er /o#trol

▪ /ompe#sate Fadi#g

?uter Loop %o!er /o#trol

▪ /ompe#sate *LE ('/@>'/@A/ou#t compari#g !it" T"res"old)

%o!er Bead-oom

▪ /ompe#sate EAT,A%o!erAlimit

LTE Power Control


15/5115

KPI for LTE

?


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%:+ Test Method and Condition =er=iew

The test achie=ed on Sa(sung >T? syste( ser=ice area6 Basically, %:+ test and test (ethod on cluster ollow the docu(ent

@>T?AiM* S AFinal6

Test ter(inal or dri=e test is a USB dongle ty)e ter(inal or (obility6

Stationary test ite(s are (easured 1 ti(e on each cluster6

Used (obile ter(inal side DM sotware is @)tis by +nnowireless co6

U? +nor(ation

Syste( +nor(ation

? E a ( ) l e o 1 *c t u a l R e ) o r t

Ty)e Model S er6 Chi)set Chi)set F er6

USB Donl( 1K3 1.0.03.010 Q#lo//2012032;1K3Q;4036;M0.02

Syste( Frequency TDD ConGguration M+M Mode

D-


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Stationary Test

Cell ?dge Co=erage :robability

ireless link Burst ?rror Rate

Sector Burst ?rror Rate

Successul Setu) rateH*ccessibility

Session establish(ent delay

Session Reco=ery success rate

MaEi(u( Round Tri) >atency

MaEi(u( Iitter

*=erage downstrea( through)ut J Ter(inal le=el

*=erage u)strea( through)ut J Ter(inal le=el

*=erage downstrea( through)ut J Sector le=el

*=erage u)strea( through)ut J Sector le=el &andoK

Mobility Test

9lobal Co=erage :robability

Dro))ed session rate H Retainability

Mini(u( Data Rate 9uarantees 8 Downstrea(

Mini(u( Data Rate 9uarantees J U)strea(

&andoK

KPI Test Items


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Test area

Cell E$e Covera$e Pro&a&ility

To =eriy Cell ?dge co=erage )robability

Measure(ent Method L using t) client CMD window

resultTest (ethod

>ocated U? at ?dge area

RSR: ; 81$$ dB( , S+R ; 4dB!

Ca)ture a CMD window teEt result

Calculate Mini(u( Download and U)load rate

Test Result

Poin" ls"(% =5

RSRP S9R D< U<

1 -10?.6 2.4 10.5 M>s 0. M>s

2 -111. 3. 5.6 M>s 0.52 M>s

3 -110.5 2.6 5.? M>s 0.3? M>s

4 -117.5 2.7 6.2 M>s 0.42 M>s

5 -102.0 2.6 12.4 M>s 0.33 M>s

6 -101.3 3.2 11.0 M>s 0.47M>s

7 -101.5 2.1 ?.5 M>s 0.6? M>s

? -10?.6 3.3 .5 M>s 1.3 M>s

-10?.? 2.4 ?.? M>s 0.51M>s

10 -106.1 3.7 11.1 M>s 0.33 M>s

11 -112.5 2.4 ?.7 M>s 0.74 M>s

12 -115.4 3.1 10.6 M>s 0.31M>s

13 -10?. 2.5 11.6 M>s 0.32 M>s

14 -106.3 4.7 11.5 M>s 0.5 M>s

15 -113.7 2.3 5.? M>s 0.33 M>s

16 -104.2 2.2 7.2 M>s 0.?3 M>s

17 -101.2 3.? 11.6 M>s 1.0 M>s

1? -10.4 3.6 11.0M>s 0.37 M>s

1 -120.6 2.1 6.7 M>s 1.6 M>s

20 -10.4 4. 11.4 M>s 1.1 M>s

:ass Criteria *cce)table Range L More than #$ N 1Mb)s,

.45kb)s!

Target Range L More than #4 N 1Mb)s,.45kb)s!


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Successful Setup !ate

• Result " 1#$$8$! H 1#$$!

To =eriy that wireless session are successul in ser=ice6

Measure(ent tool L DM tool

Measure(ent " -6 o Total call *ttach try 8 - o Call Fault! H -6 o Total call*ttach try!

Test (ethod

>ocated U? at ?dge area RSR: 804dB( O 81$4dB(!

Try *ttach 1$$ ti(es6

>ogging RRC (essage at the eB and calculate attach success rate

:ass Criteria

*cce)table Range L More than 05 N

Target Range L More than 0# N

>og Gle *nalysisL

Result

o"#l S(" % on" 1?00

S(" +#il on" 0

S(ss$l S(" R#"( 1$$ N


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Session Esta&lishment 'elay

De6! Ti(e delay ro( (essage RRCconnectionRequest to

RRCconnectionReconGgurationco()lete

Measure(ent toolL DM tool Measure(ent " Total *ttach Delay

Test (ethod


Try *ttach 1$$ ti(es6

Calculate attach delay at DM tool

:ass Criteria

*cce)table Range L >ess than .64 sec

Target Range L >ess than .64 sec

>og Gle *nalysisL

Result o"#l S(" % on" 1?00

S(ssion 8s"#>lis&/(n" D(l# 32.2 /s


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Session Esta&lishment 'elay


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To =eriy dro))ed session rate

Measure(ent toolL :SS DM

Measure(ent " - o Dro)!P- o Ti(eout!! H - o Total!

Test (ethod

Dri=e route test on Cluster area

Short call test

FT: download H u)load

:ass Criteria

*cce)table Range L >ess than 7 N

Target Range L >ess than 7 N

>og Gle *nalysis

Filtering RSR: < 811/dB( Q S+R < 8/dB!

'roppe Session !ate

• - o trac ail is eEce)ted to - o Total Try, when U? state is abnor(alstate ater Call dro)

• Result " ./P14! H1541!

Total Call 155#

Trac all 0

?nd by user #

*tte()t Call 1541

Success 151/

Dro) ./

Ti(eout 14

Dro) Rate .6/$N


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De6! To =eriy that the network allows user to enter the acti=e state with a highsuccess rate

Measure(ent toolL Syste( >og eccb Block!

Test (ethod


Try +dle to acti=e state 4$ ti(es6

>ogging RRC (essage at eccb block and calculate attach success rate

:ass Criteria


Target Range L More than 0# N

>og Gle *nalysisL

Session !ecovery Success!ate

• Result " 0$$! H 0$$!

Result o"#l S(" % on" 00

S(" +#il on" 0

S(ss$l S(" R#"( 1$$ N


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#tra-'T Ba#dover

#tra-e* Ba#dover

#ter-e* Ba#dover over C2

#ter-e* Ba#dover over S1 (#tra-99E)

#ter-e* Ba#dover over S1 (#ter-99E)

#ter-'T Ba#dover

/D9'2...+ E'+ T'+ etc

LTE (anover Classi)cation


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LTE (anover Proceure *si$nalin$+


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LTE Tool e,ample


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LTE (anover Proceure *si$nalin$+

l l


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&ando=er ro( :C+ 1$2 to :C+ .4#

Check BR >ist atrrcconnectionreconGguration (sg6

LTE Tool e,ample

- S f l


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Measure(ent toolL :SS DM, QM

Test (ethod

Dri=e between BSs and (easure &SR6:ass Criteria


Target Range L More than 05 N

>og Gle *nalysisL

(ano- . Successful !ate

Result

H* #""(/" 10?

H* s(ss 106

H* $#il 2

H* s(ss %#"( ?.13@


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%i i ' t ! t " t


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To =eriy that all :SS conGgured with (ini(u( rate ser=ice ows alwaysres)ect their (ini(u( rate guarantees

9lobal Co=erage )robability, Cell ?dge Co=erage )robability ite( is re)lacedwith this test ite(

Test (ethod

Dri=e route test on Co=erage area6

Short call test

FT: Download

:ass Criteria *cce)table Range L More than 0$ N 1Mb)s!

Target Range L More than 04 N 1Mb)s!

>og Gle *nalysis


%inimum 'ata !ate "uarantees /'own

• Result " #17! H #./!

• - o trac ail is eEcluded or calculation, when U? state is abnor(al stateater Call dro)

Total #/.

?Ece)tionTrac ail 7

?nd by user 4

D> FT: Download!*tte()t

#./

Success (ore than1Mb)s!

#17

FailureDro) /

Ti(eout 4

Mini(u( Data Success

Rate

0#601N

%i i ' t ! t


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To =eriy that all :SS conGgured with (ini(u( rate ser=ice ows alwaysres)ect their (ini(u( rate guarantees

9lobal Co=erage )robability, Cell ?dge Co=erage )robability ite( is re)lacedwith this test ite(

Test (ethod

Dri=e route test on Co=erage area6

Short call test

FT: U)load

:ass Criteria *cce)table Range L More than 0$ N .45kb)s!

Target Range L More than 04 N .45kb)s!

>og Gle *nalysis


%inimum 'ata !ate"uarantees / 0p

• - o trac ail is eEcluded or calculation, when U? state is abnor(al stateater Call dro)

• Result " #11! H #.5!

Total #/7

?Ece)tionTrac ail 4

?nd by user /

U> FT: U)load! *tte()t #.5

Success (ore than.45kb)s!

#11

FailureDro) 2

Ti(eout #

Mini(u( Data SuccessRate

0#61#N

LTE # S T''


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LTE #rame Structure1T''

LTE T' LTE Th h t


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T"eoretical %ea T-put vs Field %ractical pea T-put

msg over"ead (?ver"ead 1.)

'ir Error (Target *LE 1.)

FT% Test (D% 4 .G. 0 .G) 1 E pea vs 1 Sector pea T-put

/apacity of E-/ategory (2D%% 27E2.7)

- 9a,imum T*S(Tra#smissio# *loc Si&e): 887 bits

- 9a,imum total data rate: 1.2.HI bits

- 9a,imum #um of layers: 2 (2,2 99?)

1E T"eoretical %ea value

- limited by t"e 9a,imum data rate: mi#(887 , 2+ 1.2.HI) 3 1.2.HI - T"eoretical %ea value !it" TDD co#figuratio# 1-8 ca# be calculated as belo!:(10204 ! ") # 100 $ "1%&ps

4 !"ere J7K is t"e #umber of DL sub-frames i#cluded 2 special sub-frames+

J1..K is t"e #umber of frame !it"i# 1 sec

L resource allocatio# (2#4#4#)

- 1 Sector of e* ca# allocate L resource to 1 E 9a, * I1 (HI17 bits)

- 1 Sector of e* ca# allocate L resource to 2 Es 9a, * II (H7HI. bits)

4 12 *s are usi#g for %//B

TD >T?MaEi(u(

Through)ut

D>8U>ConGguration

S)ecialsubra(e

ConGguration

1 U? MaE6 Category /! 1 Sector MaE6

D> Mb)s! U> Mb)s! D> Mb)s! U> Mb)s!

+deal ConGg-1 conGg6 -2 516. 1264 #$65 1#65ConGg-. conGg6 -2 #165 #61 11$65 #6.

FieldConGg-1 conGg6 -2 446/ 156/ 2$6# 126.

ConGg-. conGg6 -2 2765 26# 0#6. 260

LTE T'/LTE Throu$hput

LTE 0E C t


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LTE 'E cateor *ata rates (per TTI)

Category 1 . / 7 4

D< 10 50 100 150 300

U< 5 25 50 50 75

>T? U? category (odulation or(ats su))orted

Category 1 . / 7 4D< QPSK, 16QAM, 64QAM

U< QPSK, 16QAM QPSK, 16QAM, 64QAM

>T? U? category (odulation or(ats su))orted

Category 1 . / 7 4

2R 'i(%si" Ass/(' in (%$o%/#n( %(i%(/(n"s #%oss #ll


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Avera$e own throu$hput /terminal

Measure(ent tool L Using t) client )rogra( and screen ca)ture6

Test (ethod

Stationary )oint test on / diKerent en=iron(ent area6 Single U? or test6

Measured or 1 (inutes on each )osition

Record the each through)ut at / )oints

:ass Criteria

*cce)table Range L More than 7 Mb)s

Target Range L More than 7 Mb)s

>og Gle *nalysisL

Strong RF )oint Middle RF )oint eak RF )oint Total Mb)s!

RSR: S+R D> RSR: S+R D> RSR: S+R D> *=erage

*=erage 852 .0 4/61 8#0 .$ /46/ 81$7 0 126$ /4617

D>

:oint RSR: S+RSite

234?;A 234?;B 5736;A 5736;B 5736; 21?;A 21?;B 21?; 210;A

oo' -67 'B/ 2 'B 56.7 56.3 55.6 54. 53.6 4.? 56.0 4.0 47.7

Mi' -? 'B/ 20 'B 35. 3.? 35. 35.5 33. 30. 31.6 30.1 32.

E(#k -104 'B/ 'B 21.4 12. 12.7 1?.4 14.? 15.0 12.6 10. 15.0

A(%#( /#6$$ /56// /762/ /56.2 /761$ /160$ //67$ /$6$$ /16#2

R(sl" % % % % % % % % %

A era e p thro hp t


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Test (ethod



Record the each through)ut at / )oints6

:ass Criteria

*cce)table Range L More than 1 Mb)s

Target Range L More than 1 Mb)s

>og Gle *nalysisL

Avera$e up throu$hput /terminal


RSR: S+R U> RSR: S+R U> RSR: S+R U> *=erage

*=erag

e

852 /$ 156. 8#$ .$ 060 81$7 0 .6. 067/

D>

:oint RSR: S+RSite

234?;A 234?;B 5736;A 5736;B 5736; 21?;A 21?;B 21?; 210;A

oo' -67 'B/ 30 'B 16.4 16.0 17.3 17.1 16.5 15.4 17.1 14.6 15.7

Mi' -?0 'B/ 20 'B 7.5 .0 10.6 ?. ?.1 7.1 2.3 . 13.0

E(#k -104 'B/ 'B 3. 2.4 2.2 1.2 1.0 0.7 1.0 0.4 3.6

A(%#( 06.2 061/ 1$6$/ 06$2 #64/ 262/ 5620 #6/$ 1$622R(sl" % % % % % % % % %

Avera$e own throu$hput


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Avera$e own throu$hput /sector


Test (ethod



Record the each through)ut at / )oints

:ass Criteria

*cce)table Range L More than 14 Mb)s #$N!

Target Range L More than 1# Mb)s 0$N!

>og Gle *nalysisL


RSR: S+R D> RSR: S+R D> RSR: S+R D> *=erage

*=erage 852 .# ./6. 80$ .$ 1160 81$/ 0 565 71652

D>

:oint RSR: S+RSite

234?;A 234?;B 5736;A 5736;B 5736; 21?;A 21?;B 21?; 210;A

oo' -67 'B/ 2? 'B 25.1 25.0 25.10 25.4 25.3 22.4 22.30 1.0 1.4

Mi' -0 '>/ 20 'B 14.7 14.3 11.6 13. 11. .? 12.4 11.2 10.2

E(#k -103 'B/ 'B ?.5 4. 7.2 6.0 5.? 6.1 5.0 4.0 5.2

A(%#( 7#6/$ 776.$ 7/60$ 746/$ 7/6$$ /#6/$ /062$ /76.$ /76#$

R(sl" % % % % % % % % %

Avera$e up throu$hput sector


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Test (ethod

Stationary )oint test on / diKerent en=iron(ent area6 / U?s u)loading si(ultaneously or test6


:ass Criteria

*cce)table Range L More than 464 Mb)s #$N!

Target Range L More than 564 Mb)s 0$N!

>og Gle *nalysisL

Avera$e up throu$hput / sector


RSR: S+R U> RSR: S+R U> RSR: S+R U> *=erage

*=erage 855 /$ 56# 801 .. 46/ 81$5 11 16. 1/6/1

D>

:oint RSR: S+RSite

57?3;A 57?3; 5716; 2204;A 2204;B 2204; 5714;A 5714;B 5714;

oo' -66 'B/ 30 'B ?.0 7.0 6.4 10.3 7.5 7.2 5.7 6.0 7.4

Mi' -1 'B/ 22 'B 7.5 5.1 4.? 6.3 5.7 7.3 5.1 4.6 6.3

E(#k -106 'B/ 11 'B 1.1 0.6 0. 0.6 0.7 0.7 0.7 0.7 3.4

A(%#( 1565$ 1.62$ 1.617 126.4 1/60$ 146.7 11644 116.5 1261$

R(sl" % % % % % % % % %

2ireless Bloc3 Error !ate


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Measure(ent toolL :SS DM

Measure(ent " count J count o abo=e 1N! H count

count o abo=e 1N " count o B>?R all data eEce)t $Test (ethod

Dri=e route test on Cluster area6

Short call test

:ass Criteria

*cce)table Range L 04N >ess than 1N!

Target Range L 00N >ess than 1N!

>og Gle *nalysisL

2ireless Bloc3 Error !ate

N o less than 1N B>?R ".115#8/0$! H .115#

Result

Count .115#

Count o abo=e 1N /0$

>ess than 1N B>?R 0#615N

Sector Bloc3 Error !ate


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Measure(ent toolL SM

Measure(ent " Block ?rror Rate during FT:

Test (ethod

Stationary )oint test on Cluster area6 B>?R is (easured on SM side with B>?R statistics6

:ass Criteria

*cce)table Range L 04N >ess than 1N!

Target Range L 00N >ess than 1N!

>og Gle *nalysisL

Sector Bloc3 Error !ate

Result

Total Test Sector 1#

*=e6 Sector Block ?rror Rate $617N

Count o Sector *bo=e B>?R1N!

$

Rate o sector >ess than 1NB>?R!

1$$N

%a,imum !oun Trip Latency


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De6! >atency or )ing si'e o /.byte 04N )ercentile!

Measure(ent toolL L using t) client CMD window result

Test (ethod Stationary )oint test on Cluster area6

.$N o sectors )er Cluster H ?ach Sector has test 1$$ ti(es6

:ass Criteria

*cce)table Range L >ess than 5$ (s 04N!

Target Range L >ess than 4$ (s 04N!

>og Gle *nalysisL

%a,imum !oun Trip Latency

Result

(s" Si"( 21? 210 221? 234? 5736 5737

S("o% Al B("##//

#Al B("#

#//#

Al B("##//

#Al B("#

#//#

Al B("##//

#Al B("#

#//#

on" 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

Mini// 2? 2? 27 25 2 2 2 23 22 1 22 30 2? 23 24 24 23 1

M#i// 57 4 4? 4 55 212 4 47 112 4 53 6? 50 50 146 57 150 107

A(%#( 33.57 34.35 33.61 33.?3 3?.2 36.34 35.?7 35.50 36.30 33.?7 33.?? 35.5? 35.33 33.5 35.40 35.52 35.66 33.52

Median o04N /4(s/4(s/4(s/7(s/#(s/#(s/2(s/4(s/5(s/7(s/7(s/5(s/4(s/7(s/5(s/4(s/4(s//(s

%a,imum !oun Trip Time


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%a,imum !oun Trip Time

%a,imum 4itter


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De6! Iitter or Round Tri) Delay o )ing si'e o /.byte 04N )ercentile!

Measure(ent toolL L using t) client CMD window result

Test (ethod Stationary )oint test on Cluster area6

.$N o sectors )er Cluster H ?ach Sector has test 1$$ ti(es6

:ass Criteria

*cce)table Range L >ess than 1$ (s (edian o 04N tile!

Target Range L >ess than 1$ (s (edian o 04N tile!

>og Gle *nalysisL

%a,imum 4itter

Result

(s" Si"( 21? 210 221? 234? 5736 5737

S("o% Al B("##//

#Al B("#

#//#

Al B("##//

#Al B("#

#//#

Al B("##//

#Al B("#

#//#

on" 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100

Mini// 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0

M#i// 12 15 13 12 20 12 15 16 1 23 36 12 13 13 15 15 1 23

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*utocall Setu) Mini(u( data Rate 9uarantees, Dro) rate!



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