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C!"A #owerControl
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Contents
1. Power Control Overview
2. open loop #ower Control
$. closed loop #ower Control
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%plin& transmission character
'el()inter(erence
Capacity is limited *y inter(erence
+ear)(ar eect
-ading
%plin& power control
nsure uplin& /uality with minimum transmission power
!ecrease inter(erence to other %, and increase capacity 'olve the near)(ar eect
'ave % transmission power
#urpose o( uplin& powercontrol
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!ownlin& transmission character
nter(erence among dierent su*scri*ers since the
orthogonality is in1uenced *y transmission environment
nter(erence (rom other adacent cells
!ownlin& capacity is limited *y +ode3 transmission power
-ading
!ownlin& power control
nsure !ownlin& /uality with minimum transmission power
!ecrease inter(erence to other cells, and increase capacity
'ave +ode3 transmission power
#urpose o( downlin& powercontrol
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The 4elationship *etween T5 #owerand 45 #ower
0 200 400 600 800-20
-15
-10
-5
0
5
10
15
20
Time (ms)
Relativepower
(dB)
Channel
Transmitted power
Received power
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#ower Control Classication
#ower control classication open loop power control
closed loop power control
%plin& inner)loop power control !ownlin& inner)loop power control
%plin& outer)loop power control
!ownlin& outer)loop power control
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#ower control methods adopted(or various physical channels
#ower control methods adopted (or various physical channels
789 : can *e applied, 9:9 : not applied
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Contents
;. #ower Control
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Contents
2. open loop #ower Control
2.1 open loop power control overview
2.2 #4ACH open loop power control
2.$ !#CCH open loop power control
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Contents
2. open loop #ower Control
2.; open loop power control overview
2.2 PRACH open loop power control
2.$ !#CCH open loop power control
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Contents
2. open loop #ower Control
2.; open loop power control overview
2.2 #4ACH open loop power control
2.+ DPCCH open loop power control
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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
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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
!ownlin& inner)loop powercontrol
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
!ownlin& inner)loop powercontrol
=
+=&@ 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& inner)loop powercontrol
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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
.easure an- /ompare SIR
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 SIR
.easure an- /ompare BLER
Outer
loop
Inner loop L1
L'
10+1001(00
!ownlin& outer loop powercontrol
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