09- OWJ200107 WCDMA Power Control (With Comment) ISSUE1.0

8/9/2019 09- OWJ200107 WCDMA Power Control (With Comment) ISSUE1.0

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Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

C!"A #owerControl


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Pa e2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.

Contents

1. Power Control Overview

2. open loop #ower Control

$. closed loop #ower Control


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%plin& transmission character

'el()inter(erence

Capacity is limited *y inter(erence

+ear)(ar eect

-ading

%plin& power control

nsure uplin& /uality with minimum transmission power

!ecrease inter(erence to other %, and increase capacity 'olve the near)(ar eect

'ave % transmission power

#urpose o( uplin& powercontrol


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!ownlin& transmission character

nter(erence among dierent su*scri*ers since the

orthogonality is in1uenced *y transmission environment

nter(erence (rom other adacent cells

!ownlin& capacity is limited *y +ode3 transmission power

-ading

!ownlin& power control

nsure !ownlin& /uality with minimum transmission power

!ecrease inter(erence to other cells, and increase capacity

'ave +ode3 transmission power

#urpose o( downlin& powercontrol


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The 4elationship *etween T5 #owerand 45 #ower

0 200 400 600 800-20

-15

-10

-5

0

5

10

15

20

Time (ms)

Relativepower

(dB)

Channel

Transmitted power

Received power


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#ower Control Classication

#ower control classication open loop power control

closed loop power control

%plin& inner)loop power control !ownlin& inner)loop power control

%plin& outer)loop power control

!ownlin& outer)loop power control


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#ower control methods adopted(or various physical channels

#ower control methods adopted (or various physical channels

789 : can *e applied, 9:9 : not applied



Contents

;. #ower Control



Contents


2.1 open loop power control overview

2.2 #4ACH open loop power control

2.$ !#CCH open loop power control



Contents


2.; open loop power control overview

2.2 PRACH open loop power control

2.$ !#CCH open loop power control



Contents


2.; open loop power control overview

2.2 #4ACH open loop power control

2.+ DPCCH open loop power control



open loop power control o( %L !#CCHApplication scenariosApplication scenarios

!. CCCH' RRC Connect&on Req(est

open loop power

control o) +PCCH

*. +ownl &n, ncron&/at&on

UE 0ode 1Serving RNS

er2&ngR0C

+CH - 3P

Allocate R0TIelect 4! and 4$parameters

RRCRRC

01AP01AP

5. Rad&o 4&n, et(p Response

01AP01AP$. Rad&o 4&n, et(p Req(est

RRC RRC 6. CCCH' RRC Connect&on et (p

tart RXdescr&pt&on

tart TXdescr&pt&on

7. A4CAP I(b +ata Transport 1earer et(p

RRCRRC 8. DCCH' RRC Connect&on et(p Complete

9. Upl&n, ncron&/at&on

01AP01AP :. Rad&o 4&n, Restore Ind&cat&on

+CH - 3P

+CH - 3P

+CH - 3P



Contents

;. #ower Control


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Closed loop power controloverview

The characteristics o( open loop power control The results (rom open loop power control are not

accurate enough

open loop power control can only decide the initial

power The advantages o( closed loop power control

uarantee the Do'

!ecrease the inter(erence

ncrease the system capacity


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Closed loop power control

overview

Inner loopOuter loop

BLERmea>BLERtarSIRtar

BLERmeaSIRtar

TPC=0

SIRmea


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Contents

$. closed loop #ower Control

$.; closed loop power control overview

+.2 #plin5 inner loop power control

$.$ !ownlin& inner loop power control

$.B


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%plin&)inner loop powercontrol

0ode1

UE

Transm&t TPC

Inner-loop

set IRtar

!*""H/!*""H/

Eac UE as

&ts own loop

Eac UE as

&ts own loop

TPC +ec&s&on

;" ! T!? T!1

:

T!1

1

T!1

2

T!1

+

T!1

,

RL!

1: : : : : : : : : 1 : : : : :

RL!

2

: : : : 1 : : : : 1 : : : : :

RL!

+: : : : 1 : : : : : : : : : 1

FF FF

TPC

TPC%temp&

T!

:

T!1 T!2 T!+ T!, T!9 T!< T! T!> T!? T!1

:

T!1

1

T!1

2

T!1

+

T!1

,

: : : : 1 : : : : 1 : : : : :

FF FF

TPC%CM+

Power &s controlled &n eac * t&me slots

Te power control )req(enc &s 5""HJ

%plin& inner)loop #CA2 with so(thandover


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Comparison *etween #CA; and#CA2The control (re/uency

T#C;, the power control (re/uency is ;F00HG

T#C2, the power control (re/uency is $00HG


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Contents

$. closed loop #ower Control$.; closed loop power control overview

$.2 %plin& inner loop power control

+.+ Downlin5 inner loop power control

$.B


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,o-eB

set SIRtar

Transmit TPC

.easure an- /ompare SIR

.easure an- /ompare BLER

Outer loop

Inner loop L1

L'

10+1001(00

!ownlin& closed loop powercontrol


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!ownlin& nner loop powercontrol

0ode1

et IRtar

Transm&t TPC &n eac T

Meas(re IR and compare

&t w&t IRtar

Ad>(st T? power

w&t ".*= != ! or $d1

!*""H/ 45


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!ownlin& inner loop powercontrol

hen % is not in so(t handover

The T#C which is generated *y % is transmitted in T#C domain o(

%L channel

hen % is in so(t handover, two power control modes can *e

used, which is decided *y !#Cmode=

!#C"

!#C"

slot

hen the downlin& channel is in out o( synchroniGation, % will

transmit T#C ; *ecause % can not measure the downlin& '4

How to generate TPCHow to generate TPC


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The transmission power can not higher than

"a5imum!L#ower, and not less than

"inimum!L#ower neither.

!ownlin& power adustment=

P(k) = P(k1) + PTPC(k) +Pbal(k)

here

#>&);@ is power o( previous

#T#C>&@ is the adustment

#*al>&@ is correction value

!ownlin& inner)loop powercontrol

How to adjust powerHow to adjust power


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here

#T#C>&@ is the adustment value

T#Cest>&@ is uplin& T#C value

T#C is downlin& power adustment step>0.F, ;,

;.F or 2d3@

PTPC/5

ithout 7Limited #ower 4aise %sedI


How to adjust powerHow to adjust power

=

=+=

0)(TPCif

1)(TPCif)(P

estTPC

estTPC

TPC k

kk


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here

PTPC/5

ith 7Limited #ower 4aise %sedI


=

+=&@ is the adustment value

T#Cest>&@ is uplin& T#C value

T#C is downlin& power adustment step>0.F, ;, ;.F or 2d3@

#ower4aiseLimit= the limited value (or #ower ramping in a

timer

!LpoweraveragingwindowsiGe timer (or power

ramping >T'@

+=

=1

1____

)()(k

SizeWindowAveragingPowerDLki

TPCsum iPk


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!ownlin& #ower 3alance

!ownlin& power *alance process

'4+C can monitor every single

+ode3Js transmission. ( '4+C (ound

the power oset in so(t handover is

e5cessive, it will initiate the !#3

process

The initiation and stop o( !#3

The power oset o( two 4Ls is greater

than the !#3 initial threshold, the

!#3 process is initiated

The power oset o( two 4Ls is lessthan the !#3 stop threshold, the !#3

process is stopped


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Contents

$. closed loop #ower Control$.; closed loop power control overview

$.2 %plin& inner loop power control

$.$ !ownlin& inner loop power control+., O'ter loop power control


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%plin& outer loop powercontrol

,o-eB UE

Transmit TPC


Inner+loop

Set SIRtar

Out loop

R,C

.easure re/ei2e- -ata an-/ompare BLER in te TrC

Set BLERtar

10+100


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,o-eB

set SIRtar

Transmit TPC


.easure an- /ompare BLER

Outer

loop

Inner loop L1

L'

10+1001(00

!ownlin& outer loop powercontrol


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09- OWJ200107 WCDMA Power Control (With Comment) ISSUE1.0

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Transcript of 09- OWJ200107 WCDMA Power Control (With Comment) ISSUE1.0