122603490 High Speed Uplink Packet Access HSUPA vs Uplink Interference

8/12/2019 122603490 High Speed Uplink Packet Access HSUPA vs Uplink Interference

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HSUPA VS Uplink Interference DocumentConfidentiality:

Internal

High Speed Uplink Packet Access

(HSUPA)

VS

Uplink Interference

PRINCIPLE & ES REP!R

"ith CASE SU#$

H%aei echn'l'gies C' Ltd




Internal

#ec *+,+

C'ntents

1 PRINCIPLE ................................................................................................ 4

1.1 High Speech Uplink Packet Access (HSUPA) ............................................................ 4

1.2 Uplink Interference ......................................................................................................... 5

1.3 HSUPA VS Uplink Interference .................................................................................... 7

1.4 HSUPA Phase 1(I 1!"s) an# Phase 2(I 2"s) .................................................... $

2 TEST REPORT ..................................................................................... 10

2.1 Si"%lati&n 'es%lt fr&" H est a* ............................................................................ 1!

2.2 HSUPA &a# est 'es%lt fr&" +%st&"er,---s est *e# ............................................ 11

3 CASE STUDY ......................................................................................... 19

3.1 Pr&*le" /escripti&n .................................................................................................... 1$

3.2 Pr&*le" Anal0sis ............................................................................................................. 22

3.3 S&l%ti&ns an# 'ec&""en#ati&ns .................................................................................... 25




Internal

HSUPA VS Uplink Interference

A-stract.

This technical paper aims to give the readers the understanding about the relationship

of the HSUPA service and the uplin interference !"#PP terminology is $T%P&

Received otal "ideband Po'er()

The basic principle& test reports and case study from live net'or are included here to

give a clear vie' on ho' the HSUPA service impact on the uplin performance and ho'

to optimi*e the net'or to gain a ma+imum benefit of HSUPA)

Since HSPA service is 'idely used in the maret& 'ith a good understanding of this

topic& the engineer 'ill be able to operate and optimi*e the net'or 'ell)




Internal

, PRINCIPLE

,), High Speech Uplink Packet Access (HSUPA)

HSUPA is introduced 'ithin release - of the "#PP specifications) It allo's increased individual

connection throughputs& increased total cell throughputs and reduced round trip times)

In Hua'ei system !$A.,/)/(& the HSUPA data channel !01DPDCH( can support either a 2 or ,/

ms TTI)

1 HSUPA Phase , ,+/s I offers the benefit of improved physical layer performance

over $33& pea rate is 2 4bps)

1 HSUPA (Phase *) */s I offers the benefit of reduced system delays and higher

potential throughput& pea rate is 5)6- 4bps)

(HSUPA I is c'nfig%red 0ia RNC 11L c'//and

SET CORRMALGOSWITCH: MapSwitch=MAP_HSUPA_TTI_2MS_SWITCH-1;)

$elease 6 of "#PP specification introduces the possibility of using 7 level Pulse Amplitude

4odulation !7PA4( 'hich e8uivalent to ,-9A4 to increase the ma+imum achievable throughput&

pea rate is ,,)5 4bps) !support in Hua'ei $A.,2)/()




Internal

,)2 Uplink Interference

In the %CD4A system& all the cells share the same fre8uency& 'hich is beneficial to improve the

system capacity) Ho'ever& co1fre8uency multiple+ing causes interference among the users)

The $eceived Total %ideband Po'er !$T%P( on the uplin is the sum of all user signals and the

channel noise)

Uplink Interference C'/p'siti'n is as f'll'2

N'ise 3l''r incl%de 'f ther/al n'ise and N'ise 3ig%re (N3) 'f the s4ste/ )

： ;olt*mann constant& ,)"<=

T： elvin temperature& normal temperature: 23/

%： Signal band'idth& %CD4A signal band'idth ")<74H*

.>: Hard'are !.ode;?U0( dependency& typical value of macro .ode; @" d;

If no other e+ternal factors e)g) e+ternal interference !from illegal sources(& hard'are issue) The

main factor that impact on Uplin interference is Traffic oad 'hich includes traffic load from the

users of the cell and adBacent cells)

he relati'nship -eteen %plink l'ad and %plink interference (N'ise Rise) is as -el'

! @ oad factor(

NF W T K P N

+= )l&g(1!

K J 1! 23−

( )1

1 1

11 1

TOT

N

N UL j

I NoiseRise

P i L

η = = =

−− + ∑

RTWP R!c!i"!# T$ta% Wi#!&a'# P$w!()




Internal

UL l'ad is affecting the n'ise le0el at the N'de 5 recei0er (N'ise Rise)

A typical value of cell load for dimensioning ranges from "/ to 6/

5/ is a good compromise bet'een the number of sites and the offered capacity)

Too high uplin noise level cause cell shrin !reduction of coverage(& breathing effect)

he relati'nship -eteen N'ise Rise and R"P (Recei0ed 'tal "ide-and P'er)

3r'/ pre0i'%s page

R"P (Recei0ed 'tal "ide-and P'er) d5 6 N'ise 3l''r (Pn) 7 N'ise Rise (Iown + Iother)

E8a/ple (9N'ise 3l''r: is 'ften called as 95ackgr'%nd N'ise;)




Internal

1 "ith'%t 1A : .oise >loor !d;m( @ Thermal .oise!KTB,room temperature = -108dBm( E

08uivalent .oise >igure (Feeder Loss + NF_B; NF_BS- depends on Node B type, Huae!

typ!"a# $a#ue around %&0 dB'

$i*! +%$$( #,) = -1./ 0 .0 2.) = -1.3 #,

With 45 Up%i'6 L$a# $i*! Ri*!=7 #,)8 RTWP #,) = -1.3 0 7 = 993

1 "ith 1A: 08uivalent .oise >igure 'ill be reduced due to T4A)

0+ample: .> %ithout T4A: (+<7*+) d; @ 2)5d; & .>%ith T4A： ,* d;

!calculated from the formula above(

$i*! +%$$( #,) = -1./ 0 12) = -1.74 #, 8

With .5 Up%i'6 L$a# $i*! Ri*! =3 #,) - RTWP#,) = -1.7403=-1.34

#,

,)" HSUPA VS Uplink Interference

HSUPA service allo's the users to achieve higher throughput on uplin but in the same time also

increase significant interference 'hich causing the reduction of cell user access number and

impact on the overall performance)

It is great important to balance bet'een the achievable throughput and system performance on

the uplin) Therefore& Hua'ei systems apply the oad Control mechanisms to control the level of

uplin interference in each service phase)

Ei"a%!'t $i*! +i<(!




Internal

(ore deta!# a)out Load *ontro# #or!tms, p#ease re.er to /Load *ontro# Feature o"ument'

L'ad C'ntr'l alg'rith/s are different -eteen HSUPA and R== UL as f'll's.

, Call Ad/issi'n C'ntr'l (CAC).

>or HSUPA& P;$1based decision is used to chec 'hether the 9oS re8uirement of

e+isting users is fulfilled) The 9oS is measured on the basis of the Provided ;it $ate

!P;$( of the users) If the 9oS re8uirement is fulfilled& ne' users are allo'ed to access

the net'or)

* L'ad C'ntr'l (L#R) .

1U $33 is controlled by U D$ trigger threshold if U UU D$ algorithm is s'itch on)

1HSUPA& its scheduling is controlled by Mai Ta(<!t Up%i'6 L$a# +act$( and the

real uplin load contributed by none scheduled 0DCH users)




Internal

A## CELLHSUPA. CellId6>Cellid? 1a8argetUlL'ad3act'r6@<2

,)7 HSUPA Phase ,(I ,+/s) and Phase *(I */s)

To ensure that the HSUPA user can access the cell& the minimum #;$ !#uarantee ;it

$ate( is recommended) %hen set the #;$ need to consider the trade1off bet'een user

throughput and cell user number )

High #;$ High user throughputHigh Uplin Interference o'er cell user number

o' #;$ o' user throughputo' Uplin Interference Higher cell user number

If 5R set in RNC 6Bk-ps

(,)

*/s HSUPA

4inimum Throughput@4AF （ one $C pdu 1bit rate ， #;$ ） @

4AF （ "2/bit?2ms， -7pbs ） @,-/bps

(*)

,+/s HSUPA

4inimum Throughput@4AF （ one $C pdu1bit rate ， #;$ ） @4AF（ "2/bit?,/ms ， -7pbs ） @-7bps




Internal

If 5R n't set in RNC

(,)

*/s HSUPA

4inimum Throughput @4AF （ one $C pdu1bit rate ， #;$ ） @4AF（ "2/bit?2ms， /pbs） @,-/bps

(*)

,+/s HSUPA

4inimum Throughput @4AF （ one $C pdu1bit rate ， #;$ ） @4AF（ "2/bit?,/ms ， /pbs ） @"2bps

To sum up& 'ith different HSUPA TTI& 2ms and ,/ms & the minimum guaranteed throughput of

user is vary ,B+k-ps 0s Bkp-s D ,B+k-ps 0s *k-ps) So& 'hen the uplin load is limited& the

number of user that can access the cell is different !HSUPA TTI@2ms serve less number of user

per cell due to higher guaranteed throughput 'hich generating higher uplin interference()

* ES REP!R

2), Si/%lati'n Res%lt fr'/ HF est La-

HSUPA */s IG single antenna si/%lati'n (5R6Bk-ps 1a8argetUlL'ad3act'r

6@<)

>TP user number !simultaneously upload( is limited at < due to the limited capacity of air

interface !uplin interference()

UploadofAntenna %（）

Throughputkbps（）

CAT5 8 74. 43 1215. 63CAT6 8 86. 07 1163. 18

UENumber

1RX_Antenna

用户等级

HSUPA ,+/s IG single antenna si/%lati'n (5R6Bk-ps 1a8argetUlL'ad3act'r

6@<)




Internal

>TP user number !simultaneously upload( is limited at 2/ due to the limited capacity of air

interface !uplin interference()

Upl oadofAntenna %（）

Throughputkbps（）

CAT5 20 76. 50 1100. 00

UENumber

1RX_Antenna

用户等级

2)2 HSUPA L'ad est Res%lt fr'/ C%st'/erG888s est -ed

Cell throughput and cell user number are significantly improved especially on HSUPA

Phase2 !TTI 2ms)( 'hen implemented ne' features in $A. ,2)/1I't!(>!(!'c!

Ca'c!%%ati$'IC) a'# A#apti"! R!t(a'*i**i$')

I't!(>!(!'c! Ca'c!%%ati$' +!at(! IC) aims to reduce the U interference among users

and increase the U system capacity)

Adapti0e Retrans/issi'n 3eat%re( (#4na/ic NHR) enables the system to dynamically




Internal

change the retransmission rate upon the Cell oad and U0 T+ Po'er)

1

%hen cell load and U0 Transmit Po'er are limited& the retransmission rate 'ill be

increased) Increasing the retransmission time re8uires less U0 T+ po'er thus

lo'er uplin interference)

1

%hen cell load and U0 Transmit Po'er are less& the retransmission rate 'ill be

decreased to completely utili*e the resources and increase the effective rate of

U0)

Retrans/issi'n UE rans/it

P'&er J

E-DN+ J C'0erage J UL

InterferenceJ

UE peak

thr'%ghp%t

Cell hr'%ghp%t

(1%ltiG%sers)

1a8 User

N%/-er

Large #o #o #ar,e #o #o -!,- more

S/all -!,- -!,- sma## -!,- -!,- #o #ess

JAt the sa/e effecti0e rate 'f UE

!Please refer to the comparisons charts of arge and Small $etransmission performance in

ne+t pages()

S%//ar4 HSUPA L'ad est Res%lt

est Case Antenna UserN%/-er Cell Load(% Cell Tput(!bps Cell L'ad(H) Cell p%t(1-ps) Cell Load(% Cell Tput(!bps

, 60% 1.90 5/D ,)3/ 50% 1.98

2 75% 1.25 65D 2)// 75% 2.30

" 75% 0.92 65D ,)</ 75% 2.20

7 77% 0.90 65D ,)7/ 75% 2.00

5 77% 1.28 65D ,)7/ 75% 1.90

- 77% 1.26 65D ,)7/ 75% 1.90

6 75% 1.09 65D ,)7/ 75% 1.70

< 77% 1.05 65D ,)7/ 75% 1.70

3 65D ,)"/ 75% 1.70

,/ 65D ,)2/ 75% 1.60

,, 65D ,),/ 75% 1.50

,2 65D ,)// 75% 1.40," 65D /)33 75% 1.40

,7 </D /)35 75% 1.30

,5 3/D ,),/ 75% 1.30

,- 32D ,)// 78% 1.20

I6,+/s 7 IC

(RAN,*)

I6,+/s 7 IC7Adapti0e

Retrans/issi'n (RAN,*)

I6,+/s

(RAN,,)

,

,RK

(Ind''r

Case)




Internal


, 70% 2.20 65D ")5/ 75% 3.90

2 75% 1.50 65D 2)2/ 75% 3.00

" 75% 1.09 65D 2)// 75% 2.407 75% 1.10 65D ,)5/ 75% 1.90

5 75% 0.91 65D ,)2/ 75% 1.90

- 75% 0.98 65D ,)2/ 75% 1.80

6 96% 1.16 65D ,),/ 75% 1.60

< 100% 1.20 32D ,)2/ 75% 1.50

3 ,++H ,,+ 75% 1.30

,/ 75% 1.20

,, 75% 1.10

,2 75% 1.10

," 90% 1.00

,7 1""% "#$

,5

,-

*

,RK

(Ind''r

Case)

I6*/s

(RAN,,)

I6*/s 7 IC

(RAN,*)

I6*/s 7 IC7Adapti0e



, 50% 1.80 7/D ,)3< 40% 1.98

2 75% 2.70 -/D ")3/ 60% 3.90

" 75% 2.25 65D ")// 75% 3.90

7 75% 2.55 65D ")// 75% 3.20

5 75% 2.15 65D ")// 75% 3.00

- 75% 1.95 65D 2)7/ 75% 3.00

6 75% 1.95 65D 2)// 75% 2.80

< 75% 1.88 65D 2)7/ 75% 2.40

3 75% ,)35 65D 2)5/ 75% 2.50

,/ 75% ,)6- 65D 2)2/ 75% 2.50

,, 65D 2)// 75% 2.50

,2 65D 2)// 75% 2.30

," 65D 2)2/ 75% 2.30

,7 65D ,)5/ 75% 2.10,5 65D ,)6/ 75% 1.90

,-

I6,+/s(RAN,,) I6,+/s 7 IC(RAN,*) I6,+/s 7 IC7Adapti0eRetrans/issi'n (RAN,*)

*R8s

(!%td''r

Case)


, 75% 3.70 6/D 7)7/ 70% 4.40

2 75% 2.20 65D 5)// 75% 5.40

" 75% 1.85 65D 7)// 75% 4.20

7 75% 1.90 65D ")2/ 75% 4.00

5 75% 1.96 65D 2)5/ 75% 3.50

- 75% 1.98 65D 2)2/ 75% 2.60

6 75% 1.68 65D ,)3/ 75% 2.30

< 75% 1.71 65D ,)</ 75% 2.30

3 65D ,)6/ 75% 2.20

,/ 65D ,)3/ 75% 2.20

,, </D ,)</ 75% 1.90

,2 <5D 2)// 75% 2.00

," 1""% 1#&" 75% 1.80

,7 75% 1.70

,5 75% 1.70

,-

*R8s

(!%td''r

Case)

I6*/s

(RAN,,)

I6*/s 7 IC

(RAN,*)

I6*/s 7 IC7Adapti0e


est Case ,. HSUPA I6,+/s ,R8 Antenna ith'%t R8G#i0ersit4 (Ind''r Case)




Internal

est Case *. HSUPA I6*/s ,R8 Antenna ith'%t R8G#i0ersit4 (Ind''r Case)




Internal

est Case . HSUPA I6,+/s * RKs Antenna ith R8G#i0ersit4 (!%td''r Case)




Internal

est Case . HSUPA I6*/s * RKs Antenna ith R8G#i0ersit4 (!%td''r Case)

Reference Charts fr'/ HF (Si/%lati'n Res%lt)




Internal

Aarge $etransmission compared 'ith Small $etransmission

!,/ms TTI(

/

5//

,///

,5//

2///

25//

"///

"5//

7///

1 2 3 4 5 10 15 20 25 30 35 40 45 50 51 52 53

User .muber

C e l l t h r o u g h p

/

2/

7/

-/

</

,//

,2/

C e l l A o a

Cel l Throughput Smal l Retransm ss on Cel l Throughput !arge Retransm ss on

Cel l !oa" Smal l Retransm ss on Cel l !oa" !arge Retransm ss on

Aarge $etransmission Compared 'ith Small$etransmission !2ms TTI(

/

5//

,///

,5//

2///

25//

"///

"5//

7///

75//

1 2 3 4 5 10 15 16 17 20 25 29

User .umber

C e l l T h r o u g h p u t

/

2/

7/

-/

</

,//

,2/

C e l l A o a d

Cel l Throughput !arge Retransm ss on Cel l Throughput Smal l Retransm ss on

Cel !oa" Smal l Retr ansm ss on Cel l !oa" !arge Retr ansm ss on




Internal

1In light cell l'ad& small retransmission can give users higher throughput than large

retransmission)

1In /edi%/ and hea04 cell l'ad& large retransmission can achieve much more user

numbers and cell throughput than small retransmissionG the gain can be 2/ "/) !;ased

on user numbers(

To achieve a ma+imum balance bet'een cell capacity and pea rate of single user in uplin

2* TTI &(i'< th! hi<h!( p!a6 (at! $> *i'<%! *!(8 whi%! 1.* TTI ca' &(i'< th!

hi<h!( c!%% capacit?) The operator can deploy another ne' feature !$A.,2)/(& HSUPA

TTI At$ R!c$'>i<(ati$' together 'ith A#apti"! R!t(a'*i**i$')

If the f'll'ing c'nditi'n has -een f%lfilled this UEs I sitch fr'/ */s t'

,+/s.

The Uu oad on Congestion StatusJ K the U0Ls bit rate M $ate threshold for

2ms to ,/ms

If -'th 'f the f'll'ing c'nditi'ns are f%lfilled this UEs I sitch fr'/ ,+/s t'

*/s.

the U0Ls bit rate N $ate threshold for ,/ms to 2ms) J

U0 Po'er is not limited) !If the -A, have been reported& the -;2 shall be

reported after that)(




Internal

CASE SU#$

"), Pr'-le/ #escripti'n

;ased on the customerLs feedbac in "# .et'or !$A.,/)/( of Operator FFF& the customers

had the difficulties to access the net'or &sometime can access net'or but the data throughput

is very lo' and the connections fre8uently dropped) This problem is appeared at operatorLs office

and nearby areas)

S4/pt'/s.

1;ased on the Statistic& 'e observed same pattern of high $T%P and PS drop in all cells that

circled in red)

1These cells are located in the same areas& nearby operatorLs office)

1The highest $T%P appeared in Indoor cell& CHA4CHU$IC"51, and the level of the uplin

interference of other outdoor cells reduce upon the distant from this indoor cell)

1 Uplin interference !$T%P( increase very high reached the ma+imum value at 155 d;m during

'oring hour !,/:// Q ,6:"/ hrs( on 'oring day)

1%e also conducted the >TP do'nload and upload at the Indoor cell& both give a very lo'




Internal

throughput)

Oer!tor"# O$$%&e




Internal

1ean R"P 0s HS#PA #r'p Rate (CHA1CHURIC<G,)

1ean R"P 0s 1ean n%/-er 'f HSPA %ser




Internal

")2 Pr'-le/ Anal4sis

Initially& 'e suspect that the uplin interference causing from the e+ternal source 'hich may

illegally use in the operatorLs building) This assumption 'as based on the interference pattern

that occurred in many cells in the same time)

In the first place& 'e did not e+pected that the issue related to traffic load due to based on

statistic& found that at the same number of HSUPA users& the $T%P didnLt al'ays high)

(a!mum =%0 HS23 users per "e##, te HS23 user num)er !s #!m!ted )y a!mum HS23

user num)er sett!n at 4N*'

r'%-lesh''ting Steps 'e had proposed 2 troubleshooting steps as belo'

!,(

Use Spectrum Analy*er to search for 0+ternal Interference source in operatorLs building

(2)

Conduct >ield Test !>TP upload( and open $.C 4T online trace measurement in the

Indoor Cell

Res%lts

!,(

There 'as no e+ternal interference detected by Spectrum Analy*er

(2)

;ased on the field test !>TP upload( and $.C 4T online measurement of indoor cell& 'e




Internal

detected huge increment of $T%P 'hen $33 test user doing the >TP upload !the test

user only can get $33 service due to HSUPA user number already hit ma+imum 2/

based on the setting()

est Steps

(1) Condition before start >TP upload test& based on $.C 4T online measurement of

indoor cell& the HSUPA user 'as al'ays at 2/ !HSDPA user number 'as more

than 2/( 'ith the $T%P above 135 d;m)

(2) %e started >TP Upload on $33 !from #ene+ Probe& observed the average

throughput 'as around "//bps( and the sudden increment of $T%P upto 155

d;m 'as observed via online measurement) !%e randomly checed the $T%P of

nearby outdoor cells& their $T%P also increased accordingly()

(3) .e+t& 'e started >TP Upload on HSUPA !from #ene+ Probe& observed the very

lo' throughput& most of the time 'as / bps( during that time observed no

increment of $T%P via online measurement)

(4) %e checed the oad Control parameters setting of this indoor cellG found that the

L#R (L'ad Resh%ffling) didnLt turn1on) This is the reason 'hy $.C still

scheduled bit rate to $33 users although current uplin load 'as high !above 135

d;m()

(5) >or HSUPA user& the scheduling is based on Mai Ta(<!t Up%i'6 L$a#

+act$( which *!t t$ 458 thus the bit rate 'as not scheduled to HSUPA user

conse8uently no increment of $T%P)




Internal

() %e recommended to turned1on D$ !U: ;0 $AT0 $0DUCTIO.( for Indoor Cell

and monitor) ;ased on statistic after turn1on D$& there 'as some improvement on

$T%P and PS drop but not on data throughput) Ho'ever& high $T%P still

observed during pea hour but at shorter period than before)

G!'! P($&!

O'%i'! M!a*(!!'t LMT)




Internal

(7) %e suspect there might be some issue 'ith HSUPA service as 'ell !%e

implemented the HSUPA Phase2 !TTI 2ms( in this net'or( )Thus& 'e conducted

the HSUPA oad Test& to chec ho' many HSUPA user !simultaneous >TP

upload( that the cell can support)

>rom the test result& sho'n that for indoor case !'ith , $+ antenna(& only

ma+imum 6 simultaneous upload users can supported) If the HSUPA user number

is e+ceed 6& 'ill cause over1high $T%P) P%!a*! (!>!( t$ t!*t (!*%t i' p(!"i$*

*!**i$')

W! <$t c$'>i(ati$' >($ H@ that thi* i* p($#ct %iitati$'8 th! p!(>$(a'c!

$> HSUPA Pha*! 2 with 1R a't!''a i* %iit!# a'# $'%? ca' &! ip($"!#

with '!w >!at(!* (!>!( t$ p(!"i$* *!**i$'*) i' RA12.

")" S'l%ti'ns and Rec'//endati'ns

%e provided the follo'ing recommendations to operators upon this issue as follo's&

!,(

To turn1off the HSUPA phase 2 in current net'or and implement it later 'hen upgraded

from $A.,/)/ to $A.,2)/ 'ith Interference Cancellation and Dynamic .H$ features

enabled)

(2)

To upgraded capacity of indoor site by adding 2nd carrier) This is to improve user e+perience

especially on data throughput)

(3)

To turn1on oad Control !D$( to control the interference level 'hich generated from $33

users)




Internal



Documents

122603490 High Speed Uplink Packet Access HSUPA vs Uplink Interference