zte umts power control-20090302
TRANSCRIPT
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ZXWR RNC
Power Control
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2
Content
Uplink Open Loop Power Control
Downlink Open Loop Power Control
Uplink Inner Loop Power Control
Downlink Inner Loop Power Control
HSDPA Power Control
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Uplink Open Loop Power Control
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Uplink Open Loop Power Control - PRACH
Purpose: Estimate the initial transmit power of physical channels such as
PRACH, DPCCH and DPDCH, and mainly refers to determining the PRACH
transmit power.
PRACH Initial Transmit Power:
Preamble_Initial_Power = Primary CPICH DL TX power CPICH_RSCP
+UL interference + Constant Value
- Primary CPICH DL TX power: transmit power of P-CPICH which isbroadcasted in SIB5 or SIB6.
- CPICH_RSCP: the channel code power of CPICH measured by UE.
- UL interference: uplink interference, which is measured by NodeB and
updated in real time in SIB7.
- Constant Value (ConstVal): related with the cell environment and theservice rate on PRACH, broadcasted in SIB5 or SIB6.
If Preamble_Initial_Power > MaxRACHTxPwr, Preamble_Initial_Power =
MaxRACHTxPwr.
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Uplink Open Loop Power Control - PRACH
If Preamble_Initial_Power > MaxRACHTxPwr, Preamble_Initial_Power =
MaxRACHTxPwr.
If no response (+1 or -1) of AICH is received after the first PRACH
preamble composed, UE selects a new signature in the next timeslot.
Increases the preamble transmit power by Power Ramp Step (PRStep).
The transmit power of the control part of PRACH message is:
PRACH_C_Power = Preamble_Initial_Power+sum(PowerRampStep)+Pp-m
- Pp-m(POPpm): power offset between the control channel and the last
PRACH preamble which is related to the PRACH message TFC.- Similar to uplink DPDCH and DPCCH, the power of the PRACH
message control part and data part is controlled by the gain factorc and
d.
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Uplink Open Loop Power Control - DPCCH & DPDCH
ccc
cd d
Scode
I+jQ
DPCCH
DPDCH I
S
2
)(d
c
DPDCH
DPCCH
P
P
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Uplink Open Loop Power Control - DPCCH
Uplink DPCH Open Loop Power Control mainly determine the initial
transmit power of DPCCH, and the gain factorc and d of the uplink
DPCCH and DPDCH.
DPCCH_Initial_power = DPCCH_Power_offset - CPICH_RSCP
DPCCH_Power_offset = Eb/N0+ (NT+IT) PG + CPICH_TX_Power
- Eb/No: quality factor of the DPCCH PILOT domain (DpcchPilotEbN0).
- NT+IT: uplink interference, measured by NodeB updated in SIB7.
- PG: Processing Gain, which equals to the DPCCH Spreading Factor 256.
c and d are set fixed value according to the TFC.
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Downlink Open Loop Power Control
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Downlink Open Loop Power Control Common Physical Channels
Downlink common physical channels transmit power and parameters:
AichPwrAICH
PichPwrPICH
MaxFachPwrFACHSCCPCH
PchPwrPCHSCCPCH
BchPwrP-CCPCH
PcpichPwrP-CPICH
SschPwrS-SCH
PschPwrP-SCH
Channel Parameter Default
-7dB(0.4w)
-7dB(0.4w)
-1dB(1.6w)
-3dB(1w)
-3dB(1w)
33dBm(2w)
-4dB(0.79w)
-3dB (1w)
%
4.5%
10%
0.39%
0.5%
Activation Ratio
10%
10%
10%
10%
90%
100%
10%
10%
0.5%
0.8%
0.2%
0.2%
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Downlink Open Loop Power Control P-SCH Power
Primary Synchronization Channel and Secondary Synchronization
Channel are used in cell search procedure;
Cell search procedure includes:- Slot synchronization
- Frame synchronization and acquire the scrambling code group number
- Identify the Primary Scrambling Code
- P1: P-SCH transmit power- P2: S-SCH transmit power
- P3: P-CPICH transmit power
- PTOT: Maximum downlink transmit power (MAXDlTxPwr)
- PI : Total received power from other cells
- PR: Total received power from serving cells- P-SCH load factor: P1/(P1+P2)
- SCH load factor: (P1+P2)/ PTOT- P-CPICH load factor: P3/ PTOT- Geological factor G: PR / PI, (-6,6)dB, -6dB means cell border
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Downlink Open Loop Power Control P-SCH & S-SCH Power
0
500
1000
1500
2000
2500
3000
5.00% 7.50% 10.00% 12.50% 15.00%
ms initial search
= 0.5, = 0.1, G = -3
Vs cell search time
initial
search
15.0% 43.35 ms
12.5% 57.46 ms
10.0% 96.27 ms
7.5% 297.3ms
5.0% 2476 ms
- The initial cell search time increases greatly when
is less than 10%but changes little when is larger than 10%.- The larger the is, the less power the other downlink physical channel
can use.
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Downlink Open Loop Power Control P-SCH & S-SCH Power
initial search
0.5 96.27 ms
0.55 82.23 ms
0.6 74.47 ms
0.65 69.63 ms
0.7 67.18 ms
0.75 68.41 ms
= 0.1, = 0.1, G = -3
Vs cell search time
- The initial cell search time decreases when the P-SCH power increases.- The second step of cell search (Frame synchronization) is more efficientthan the first step (Slot synchronization), so takes the value around 0.6.
0
20
40
60
80
100
120
50.00% 55.00% 60.00% 65.00% 70.00%
ms
initial search
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Downlink Open Loop Power Control P-CPICH Power
initial search
12.5% 96.15 ms
10% 96.27 ms
7.5% 108.13 ms
5% 155.79 ms
2.5 1462.5 ms
= 0.5 = 0.1, G = -3
Vs cell search time
- The initial cell search time increases greatly when is less than 5% but
changes little when is larger than 10%.- P-CPICH is used to do channel estimation, so 10% is recommended.
0
200
400
600
800
1000
1200
1400
1600
2.50% 5.00% 7.50% 10.00% 12.50%
ms initial search
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Downlink Open Loop Power Control P-CCPCH Power
Simulation results of
The Impact of CellSearch on System
Performance in
WCDMA from IEEE.
The simulation settingsof ETSI Vehicular A
environment are listed in
the right table.
Sectors/site 3
Site to site distance [m] 6000Log-normal fading std [dB] 10
Correlation distance [m] 28.85
Speed [km/h] 120
Handover margin [dB] 3
Maximum active set size 2
Maximum power for one TCH [W] 1
Maximum BS power for all TCH [W] 18
Power for CPICH [W] 1
Required Eb/No [dB] 7.9
Processing gain [dB] 26.8
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Downlink Open Loop Power Control P-CCPCH Power
Downlink Transport Channel C/I Vs SCH+P-CCPCH power
The best value ofSCH+PCCPCH
power is 0.5w
which is -3dB
compare to the P-
CPICH power
setting in thesimulation
environment
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Downlink Open Loop Power Control P-CCPCH Power
Downlink Transport Channel C/I Vs P-SCH/P-CCPCH power
The acceptablerange of P-SCH/P-
CCPCH is [-10,0]dB,
ZTE takes the value
of 0dB which is -3dB
compare to the P-
CPICH power settingin the simulation
environment.
.
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Downlink Open Loop Power Control S-CCPCH
S-CCPCH carries PCH and FACH;
There is no inner loop power control for the S-CCPCH, so the
maximum power of S-CCPCH is configured.
S-CCPCH carrying PCH uses SF128 code. Test results of paging
shows the paging failure ratio does not change much when the PCH
power takes the value of -3dB, -1dB and 0dB. So the default value is -
3dB.
S-CCPCH which carries FACH uses SF64 code, the maximum power
is -1dB and the transmit power is changed according the TFC of FACH.
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Downlink Open Loop Power Control DPCH
Determine the initial DPCH transmit power;
totaltxcpichc
CPICHtxreq
b
inittx P
N
E
P
PG
NE
P ,
0
,0
,
- PG: Processing Gain
- Ptx,CPICH: P-CPICH transmit power- Ec-cpich/N0: CPICH Ec/N0(dB) reported by UE- : Orthogonal Factor, 0.5
- Eb/No: Eb/No of the service configured corresponding to the current
rate of the access service.
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Downlink Open Loop Power Control DPCH
Traffic Class Data Rate Downlink Traffic Eb/N0 (dB)
Conversational DL WAMR6.60k~23.85k 7.5
Conversational DL 64K(PS Conversational Video) 5.2
Conversational DL NAMR4.75k~12.2k 7.5
Streaming PS64k 1.7
Streaming PS384k 0.9
Streaming PS128k 0.9
Streaming CS64k 1.7
Interactive PS8k 6.9
Interactive PS64k 4.8
Interactive PS384k 0.9
Interactive PS128k 4.5Background PS8k 6.9
Background PS64k 1.7
Background PS384k 4.7
Background PS128k 0.9
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Uplink Inner Loop Power Control
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Uplink Inner Loop Power Control
The specifications define following inner loop power control:
- Receiver measures the SIR (Eb/No) of each radio link and compare
with the target SIR (SIRtarget) which is set fixedly according to theservice type.
- If SIR>= SIRtarget, Receiver sends a TPC command 0 to Transmitter;
- If SIR< SIRtarget, Receiver sends a TPC command 1 to Transmitter;
- Transmitter changes the transmit power according to the TPC
command value. The delta value is TPC_cmd*TPC_STEP_SIZE(TpcStepSize).
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Uplink Inner Loop Power Control
The specification 25.214 defines two uplink inner loop power control
method which is configured by parameterUlIlPcAlgin OMCR.
- Algorithm 1: the UE transmit power can be adjusted every timeslot,and transmit power can be increased or decreased.
- Algorithm 2: UE transmit power is adjusted every five timeslots, and
transmit power can be increased, decreased or not changed.
Current Parameters Configuration:- Algorithm 1 tracks the fluctuating of channel better than Algorithm 2.
- According to the network deployment now (Feb, 2009), there is no
continuous coverage (no macro-diversity gain) and only one carrier (no
load balancing), Algorithm 1 is recommended.
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Downlink Inner Loop Power Control
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Downlink Inner Loop Power Control
UTRAN adjusts the current downlink powerP(k-1) to the new transmit
powerP(k) according to the following formula:
P(k) = P(k- 1) + PTPC(k) + Pbal(k)
- PTPC(k): the kth power adjustment value;
- Pbal(k): correction value to balance the power of radio links.
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Downlink Inner Loop Power Control
Two downlink inner loop power control method can be configured by
parameterDPCMode in OMCR:
- Mode 1: UE sends a TPC command at each timeslot. The UTRANadjusts the transmit power at each timeslot according to the TPC
command.
- Mode 2: UE sends the same TPC command for three timeslots. The
UTRAN adjusts the transmit power once every three timeslots
according to the TPC command.
The step to adjust the downlink transmit power is configured by
parameterTpcDlStep.
Current Parameters Configuration:
- Mode 1 tracks the fluctuating of channel better than Mode 2.
- According to the network deployment now (Feb, 2009), there is no
continuous coverage (no macro-diversity gain) and only one carrier (no
load balancing), Mode1 is recommended.
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HSDPA Power Control
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HSDPA Power Control HSDPA total power alloction
Free allocation of NodeB
- The total power used by HSDPA (HS-SCCH & HS-PDSCH) shall not
exceed [Maximum cell power - downlink transmit R99 power (including
common physical channels power)];
- In each TTI, NodeB reports the TSSI (Transmitted Signal Strength
Indicator),
R99 power = TSSI HSDPA used power
- In the next TTI, the available HSDPA power is:
HSDPA total power = Maximum cell power - R99 power
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HSDPA Power Control HS-SCCH power setting
NodeB determines the HS-SCCH power according to the CQI-
based outer loop power control algorithm
Pdelta)/(9)/s( hs hspdschscchCPICHHSSCCH NoEsNoEPP
PCPICH: Refers to the receive power of pilot channel (Unit: dBm).
(Es/No)hsscch is constantly 1.2dB.
: refers to the MPO (MeasPwrOffset).
(Es/No)hspdsch = -4.5 + CQI dB; Pdelta: the value obtained based on HS-SCCH BLER outer loop
adjustment.
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HSDPA Power Control Measurement Power Offset (MPO)
UE shall assume a total received HS-PDSCH power:
- the total received power is evenly distributed among the HS-PDSCH
codes of the reported CQI value
- the measurement power offset is signaled by higher layers
- the reference power adjustment is given by specifications
CPICHHSPDSCH PP
In case that the number of HS-SCCH is 2, simulation shows:
- the highest cell throughput is achieved when MPO=6dB;
- the average scheduled UE number falls down when MPO exceeds
7dB.
- the average HS-PDSCH number scheduled falls down when MPOexceeds 6dB.
The default value of MPO is 6dB
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HSDPA Power Control Measurement Power Offset (MPO)
Items Settings Items Settings
Running Time for Simulation 10 secondsAverage number of user
per cell
10
Inter-site Distance 2000m Category of user 8
Number of Cells 21 Mean acceleration of UE 0
Path Loss Model 128.2+37.6log[d(km)] Flow Controller YES
Shadowing fading model
Lognormal fading
Standard Dev 8dB Scheduler PF
Max Transmit Power 41.2dBm Max retransmission No. 3
Power of CPICH 31.2dBmCombination of
retransmissionCC
Number of HS-SCCH 2 Receiver Rake
Power control of HS-SCCH Based on CQI Number of HS-DSCH 14
Max power of each HS-SCCH 0.5W Power of HSDPA 65%
Min power of each HS-SCCH 0.02W Channel model PA3
Number of HARQ processes 8 Orthogonality factor 0.6
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HSDPA Power Control Measurement Power Offset MPO)
Average Cell Throughput Vs MPO
the highest cell throughput is achieved when MPO=6dB
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HSDPA Power Control Measurement Power Offset MPO)
Average Scheduled User No. Vs MPO
the average scheduled UE number falls down when MPO exceeds 7dB
Average Scheduled User No.
0
1
2
3
3 4 5 6 7 8 9 MPO
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HSDPA Power Control Measurement Power Offset MPO)
Scheduled HS-PDSCH No. Vs MPO
average scheduled UE number falls down when MPO exceeds 7dB
Scheduled HS-PDSCH No.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
3 4 5 6 7 8 9 MPO
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Parameters
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Power Control Parameters - ConstVal
Parameter name PRACH Initiation Tx Power Constant Value(dB)
Abbreviated name ConstVal
DescriptionThis parameter is the correction value when calculating
the initial transmission power of PRACH preamble.
Range and Step [-35, -10]dB step 1dB
Unit dB
Default Value
(note)-18dB
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Power Control Parameters - PRStep
Parameter name PRACH Preamble Power Ramp Step(dB)
Abbreviatedname
PRStep
Description
This parameter indicates the power ramp step used by
the UE when it does not receive any responses from
AICH after sending a preamble. This parameter is usedto be added to the previous power, and then the next
preamble is sent at this new power.
Range and Step [1, 8]dB step 1dB
Unit dB
Default Value
(note)1dB
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Power Control Parameters - POPpm
Parameter
name
Power Offset between PRACH Control Part and PRACH
Data Part
Abbreviated
namePOPpm[MAX_ PRACH _TFC]
Description
This parameter indicates the power offset between control
part of the PRACH message part and the last preamble. It
should be configured for each TFC. WhereMAX_PRACH_TFC=32.
Range and
Step-510dB step 1dB
Unit dB
Default Value
(note)22
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Power Control Parameters - DpcchPilotEbN0
Parameter name DPCCH Pilot Field Eb/N0(dB)
Abbreviated name DpcchPilotEbN0
Description
This parameter indicates the quality factor of the UL
DPCCH PILOT domain which is a constant used for
calculating the UL DPCCH power offset for a newly
accessed call.
Range and Step[-30, +30]dB
step 0.1dB
Unit dB
Default Value (note) Next slide
C
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Conversational UL 3.4kbps Signaling(AM): 3dB Background UL PS 64kbps: 3dB
Conversational UL AMR 6.60~23.85kbps: 3dB Background UL PS 384kbps: 5dB
Conversational UL 64kbps (PS Conversational Video): 3dB Background UL PS 128kbps: 3dB
Conversational UL NAMR 4.75~12.2kbps: 3dB Interactive UL PS 1024kbps: 5dB
Conversational UL CS 28.8kbps: 3dB Interactive UL PS 2.048Mbps: 5dB
Conversational UL CS 32kbps: 2dB Interactive UL PS 3. 072Mbps: 5dB
Conversational UL CS 64kbps: 3dB Interactive UL PS 4.096Mbps: 5dB
Streaming UL CS 14.4kbps: 3dB Interactive UL PS 5.76Mbps: 5dB
Streaming UL CS 28.8kbps: 3dB Background UL PS 1024kbps: 5dB
Streaming UL CS 57.6kbps: 3dB Background UL PS 2.048Mbps: 5dB
Streaming UL CS 64kbps: 3dB Background UL PS 3. 072Mbps: 5dB
Streaming UL PS 64kbps: 3dB Background UL PS 4.096Mbps: 5dB
Streaming UL PS 384kbps: 5dB Background UL PS 5.76Mbps: 5dB
Streaming UL PS 128kbps: 3dB Streaming UL PS 1024kbps: 5dB
Interactive UL PS 64kbps: 3dB Streaming UL PS 2.048Mbps: 5dB
Interactive UL PS 384kbps: 5dB Streaming UL PS 3. 072Mbps: 5dB
Interactive UL PS 128kbps: 3dB Streaming UL PS 4.096Mbps: 5dB
Streaming UL PS 5.76Mbps: 5dB
Power Control Parameters - DpcchPilotEbN0
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Power Control Parameters - PschPwr
Parameter name Primary SCH Power(dB)
Abbreviated
namePschPwr
DescriptionPSCH transmission power. This parameter is the offset
relative to PCPICH power.
Range and Step [-35, +15]dB step 0.1dB
Unit dB
Default Value
(note)-3dB
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Power Control Parameters - SschPwr
Parameter name Secondary SCH Power(dB)
Abbreviated name SschPwr
DescriptionSSCH transmission power. This parameter is the offset
relative to PCPICH power.
Range and Step [-35, +15] dB step 0.1dB
Unit dB
Default Value
(note)-4dB
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Power Control Parameters - PcpichPwr
Parameter name P-CPICH Power(dBm)
Abbreviated name PcpichPwr
Description
This parameter indicates the transmission power level
of the Primary CPICH (Common Pilot Channel), which
is an absolute value.
Range and Step [-10.0, 50.0]dBm step 0.1dBm
Unit dBm
Default Value
(note)33.0dBm
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Power Control Parameters - PchPwr
Parameter name PCH Power(dB)
Abbreviated name PchPwr
Description
This parameter indicates the transmission power of the
PCH mapped on the SCCPCH, which is a power offset
relative to the PCPICH power.
Range and Step [-35, 15]dB step 0.1dB
Unit dB
Default Value
(note)-3dB
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Power Control Parameters - MaxFachPwr
Parameter name Maximum FACH Power(dB)
Abbreviated name MaxFachPwr
Description
This parameter indicates the maximum transmission
power of the FACH which is mapped on the SCCPCH.
This parameter is the relative value based on thePCPICH transmission power.
Range and Step [-35, 15]dB step 0.1 dB
Unit dB
Default Value
(note)-1dB
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Power Control Parameters - AichPwr
Parameter name AICH Power(dB)
Abbreviated name AichPwr
DescriptionThis parameter indicates the AICH transmission power,
which is an offset relative to the Primary CPICH power.
Range and Step [-22, 5]dB step 1dB
Unit dB
Default Value
(note)-7dB
P C l P T S Si
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Power Control Parameters -TpcStepSize
Parameter name TPC Step Size (dB)
Abbreviated name TpcStepSize
Description
This parameter indicates the TPC step size for uplink
inner loop power control. Only when inner loop power
conrol algorithm 1 is selected, this parameter needs tobe configured. For algorithm 2, default value of TPC
step size is 1 and this parameter is not needed.
Range and Step 1dB, 2dB
Unit dB
Default Value
(note)1dB
P C t l P t UlIlP Al
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Power Control Parameters -UlIlPcAlg
Parameter name Uplink Inner Loop Power Control Algorithm
Abbreviated
name UlIlPcAlg
Description
This parameter indicates which uplink inner loop power
control algorithm is used. For algorithm 1 inner loop
power control is done every time slot. For algorithm 2
inner loop power control is done every 5 tim slots.
Range and Step1: Algorithm 1
2: Algorithm 2
Unit N/A
Default Value
(note)1: Algorithm 1
P C t l P t DPCM d
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Power Control Parameters - DPCMode
Parameter name DPC Mode
Abbreviated
name DPCMode
Description
This parameter indicates which downlink inner loop
power control algorithm is used. There are two kinks of
downlink inner power control algorithm: single TPC and
TPC triplet in soft. And which algorithm to be used
should be configured to UE.
Range and Step0: Single TPC
1: TPC Triplet in Soft
Unit N/A
Default Value
(note)0: Single TPC
P C t l P t T DlSt
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Power Control Parameters - TpcDlStep
Parameter
nameTPC DL Step Size(dB)
Abbreviated
nameTpcDlStep
Description
This parameter indicates downlink inner loop power control
adjustment step length. Usually with stable channel condition,
this value is small; in worse radio environment, this value is
larger.
Range and
Step0.5 1 1.5 2dB
Unit dB
Default Value
(note)1dB
P C t l P t M P Off t
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Power Control Parameters - MeasPwrOffset
Parameter name HS-PDSCH Measurement Power Offset(dB)
Abbreviated name MeasPwrOffset
Description
This parameter indicates the assumed HS-PDSCH
power offset relative to P-CPICH/S-CPICH power used
for CQI measurement.
Range and Step [-6, 13]dB step 0.5 dB
Unit dB
Default Value
(note)6
P C t l P t Li t
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Power Control Parameters List
Name Default Value TRUE Value
ConstVal -18dB -18dB
PRStep 1dB 1dBPOPpm [2, 2]dB [2, 2]dB
DpcchPilotEbN0 slide 35 slide 35
PschPwr -3dB -3dB
SschPwr -4dB -4dB
PcpichPwr 33.0dBm 33.0dBm
ScpichPwr 0dB 0dB
BchPwr -3dB -3dB
PchPwr -3dB -3dB
MaxFachPwr -1dB -1dB
PichPwr -7dB -7dB
AichPwr -7dB -7dB
TpcStepSize 1dB 1dB
UlIlPcAlg 1: Algorithm 1 1: Algorithm 1
DPCMode 0: Single TPC 0: Single TPC
TpcDlStep 1dB 1dB
MeasPwrOffset 6dB 6dB
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