02 - owj200102 wcdma power control algorithm and parameters ran10 issue2.00
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8/14/2019 02 - OWJ200102 WCDMA Power Control Algorithm and Parameters RAN10 ISSUE2.00
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
CDMA system have the embedded characteristics of self-interference, for uplink one
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user’s transmission power become interference to others.
The more connected users, the higher interference. Generally the capacity is limited by
interference level.
WCDMA suffer from Near-far effect, which means if all UE use the same transmission
power, the one close to the NodeB may block the entire cell.
Uplink power control can guarantee the service quality and minimize the required
transmission power. It will resolve the near-far effect and resist fading of signal
propagation. By lowering the uplink interference level, the system capacity will be
increased.
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WCDMA Power Control and Relevant Parameters
The downlink has different characteristics from the uplink, for downlink interference is
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caused by multi-path, part of one user’s power also become interference to others.
Downlink power from adjacent cells also is one part of interference to the own cell.
Transmission power of NodeB is shared by all users channels, so downlink capacity
usually is considered to be limited by transmission power.
Downlink power control also can guarantee the service quality and minimize the required
transmission power, so the capacity is maximized in case that interference is lowered.
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WCDMA Power Control and Relevant Parameters
Because of channel fading in mobile communication system, the radio signal is
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deteriorated and fluctuated, the fast power control become one key technology to resist
this phenomenon.
In this figure, the channel fading is compensated by the transmitting power, which is
adjusted by the fast power control, so the receiving power is almost constant and theradio propagation condition is improved.
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WCDMA Power Control and Relevant Parameters
In WCDMA system, power control includes open loop and closed loop power control.
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Open loop power control is used to determine the initial transmission power, and the
closed loop power control adjusts the transmission power dynamically and continuously
during the connection.
For uplink, the UE’s transmission power is adjusted; and for downlink, the NodeB’s
transmission power is adjusted.
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WCDMA Power Control and Relevant Parameters
Open loop power control is used in two cases:
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1. to decide the initial transmission power of PRACH preamble.
2. to decide the initial transmission power of DPCCH / DPDCH.
Closed loop power control is only applied on DPCCH and DPDCH
For other common channels, power control is not applied, they will use fixed transmission
power:
The PCPICH power is defined by the PCPICH TRANSMIT POWER parameter as
an absolute value in dBm.
All other common channels power is defined in relation with the PCPICH
TRANSMIT POWER parameter, and measured in dB.
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WCDMA Power Control and Relevant Parameters
MAXTXPOWER
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Parameter name: Max transmit power of cell
Value Range: 0 to 500
Physical Value Range: 0dBm to 50 dBm, step 0.1dB
The recommended value is 430, namely 43dBm
Content: The sum of the maximum transmit power of all DL channels in a cell.
Set this parameter through ADD CELLSETUP, query it through LST CELL and modify it
through MOD CELL
PCPICHPOWER
Parameter name: PCPICH transmit power
Value Range: -100 to 500
Physical Value Range: -10dBm to 50 dBm, step 0.1dB
The recommended value is 330, namely 33dBm
Content: This parameter should be set based on the actual environment and the downlink
coverage should be guaranteed firstly. If PCPICH transmit power is configured too great, the
cell capacity will be decreased, for power resources is occupied by common channel and
the interference to traffic channels is also increased.
Set this parameter through ADD PCPICH, query it through LST PCPICH and modify it
through MOD CELL
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WCDMA Power Control and Relevant Parameters
PSCHPOWER or SSCHPOWER
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Parameter name: PSCH / SCCH transmit power
Value range: -350 to 150.
Physical value range: -35 to 15, step 0.1dB
The recommended value is -50, namely -5dB
Content: The offset between the PSCH / SSCH transmit power and PCPICH transmit power.
For PSCH Power, set it through ADD PSCH, and query it through LST PSCH; for SSCH
Power, set it through ADD SSCH, and query it through LST SSCH. And modify it through
MOD CELL
BCHPOWER
Parameter name: BCH transmit power
Value Range:
-350 to 150
Physical Value Range: -35 to 15 dB, step 0.1dB
The recommended value is -20, namely -2dB
Content: The offset between the BCH transmit power and PCPICH transmit power.
Set this parameter through ADD BCH, query it through LST BCH, and modify it through
MOD CELL
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WCDMA Power Control and Relevant Parameters
MAXFACHPOWER
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Parameter name: Max transmit power of FACH
Value range : -350 to 150
Physical Value Range: -35 to 15 dB, step 0.1dB
The recommended value is 10, namely 1dB
Content: The offset between the FACH transmit power and PCPICH transmit power.
Set this parameter through ADD FACH, query it through LST FACH, and modify it
through MOD SCCPCH
PCHPOWER
Parameter name: PCH transmit power
Value Range: -350 to 150
Physical Value Range: -35 to 15 dB, step 0.1dB
The recommended value is -20, namely -2dB
Content: The offset between the PCH transmit power and PCPICH transmit power.
Set this parameter through ADD PCH, query it through LST PCH, and modify it
through MOD SCCPCH
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WCDMA Power Control and Relevant Parameters
AICHPOWEROFFSET
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Parameter name: AICH power offset
Value Range: -22 to 5
Physical Value Range: -22 to 5 dB, step 1dB
The default value of this parameter is -6, namely -6dB
Content: The offset between the AICH transmit power and PCPICH transmit power.
Set this parameter through ADD CHPWROFFSET, query it through LST
CHPWROFFSET, and modify it through MOD AICHPWROFFSET
PICHPOWEROFFSET
Parameter name: PICH power offset
Value Range: -10 to 5
Physical Value Range: -10 to 5 dB , step 1dB
The default value of this parameter is -7, namely -7dB
Content: The offset between the PICH transmit power and PCPICH transmit power.
Set this parameter through ADD CHPWROFFSET, query it through LST
CHPWROFFSET, and modify it through MOD PICHPWROFFSET
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
In downlink open loop power control, the initial transmission power is calculated according
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to the downlink path loss between NodeB and UE.
In uplink, since the uplink and downlink frequencies of WCDMA are in the same
frequency band, a significant correlation exists between the average path loss of the two
links. This make it possible for each UE to calculate the initial transmission powerrequired in the uplink based on the downlink path loss.
However, there is 90MHz frequency interval between uplink and downlink frequencies,
the fading between the uplink and downlink is uncorrelated, so the open loop power
control is not absolutely accurate.
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
In access procedure, the first signaling “RRC CONNECTION REQUEST” is transmitted in
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message part on PRACH.
Before PRACH message part transmission, UE will transmit PRACH preamble, and the
transmission power of first preamble is calculated by this PRACH open loop power control.
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WCDMA Power Control and Relevant Parameters
In this formula, where
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PCPICH TRANSMIT POWER defines the PCPICH transmit power in a cell. It is
broadcast in SIB5 .
CPICH_RSCP means received signal code power, the received power measured
on the PCPICH. The measurement is performed by the UE.
UL interference is the UL RTWP measured by the NodeB. It is broadcast in SIB7 .
CONSTANT VALUE compensates for the RACH processing gain. It is broadcast in
SIB5 .
The initial value of PRACH power is set through open loop power control. UE operation
steps are as follows:
1. Read “Primary CPICH DL TX power ”, “UL interference ” and “Constant value ”
from system information.
2. Measure the value of CPICH_RSCP ;
3. Calculate the Preamble_Initial_Power of PRACH.
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WCDMA Power Control and Relevant Parameters
CONSTANTVALUE
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Parameter name: Constant value for calculating initial TX power
Value range : -35 ~ -10
Physical Value Range: -35 to -10 dB
Content: It is used to calculate the transmit power of the first preamble in the
random access process.
Recommended value: -20
Set this parameter through ADD PRACHBASIC, query it through LST PRACH, and
modify it through MOD PRACHUUPARAS
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WCDMA Power Control and Relevant Parameters
After UE transmit the first Preamble on PRACH, it will wait for the corresponding AI
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(Acquisition Indicator) on the AICH. The timing relationship of PRACH and AICH is shown
in above figure.
There will be 3 parameters used to define the timing relationship:
τ ττ τ p-p : time interval between two PRACH preambles. τ p-p is not a fixed value, it is
decided by selecting access slot of PRACH preambles,
Here τp-p has one restriction, it must be longer than a minimum value τ ττ τ p-p min ,
namely τ p-p ≥ τ p-p min .
τ ττ τ p-a : time interval between PRACH preamble and AICH Acquisition Indicator. If UE
sends the PRACH preamble, it will detect the responding AI after τ p-a time.
τ ττ τ p-m : time interval between PRACH preamble and PRACH message part. If UE
sends the PRACH preamble and receives positive AI from the AICH, it will send the
message part after τ p-m time.
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WCDMA Power Control and Relevant Parameters
Parameter AICHTXTIMING is used to define the set of τ p-p min , τ p-a , τ p-m .
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AICHTXTIMING
Parameter name: AICH transmission timing
Value range: 0,1
Content:
When AICHTXTIMING = 0,
τ ττ τ p-p,min = 15360 chips, τ ττ τ p-a = 7680 chips, τ ττ τ p-m = 15360 chips
When AICHTXTIMING = 1,
τ ττ τ p-p,min = 20480 chips, τ ττ τ p-a = 12800 chips, τ ττ τ p-m = 20480 chips
Recommended value: 1
Set this parameter through ADD AICH, query it through LST AICH, and modify it
needs de-activated the cell through DEA CELL. After the old configuration of AICH
is deleted through RMV AICH , a new AICH can be established through ADD AICH
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WCDMA Power Control and Relevant Parameters
After UE transmit the first Preamble,
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If no positive or negative AI on AICH is received after τ p-a time,
UE shall increase the preamble power by POWER RAMP STEP , andretransmit the preamble.
This ramping process stops until the number of transmitted preambles has
reached the MAX PREAMBLE RETRANSMISSION within an access cycle,
or when the maximum number of access cycles has reached MAX
PREAMBLE LOOP .
If a negative AI on AICH is received by the UE after τ p-a time,
which indicates rejection of the preamble, the UE shall wait for a certain
“Back-off Delay” and re-initiate a new random access process.
When a positive AI on AICH is received by UE after τ p-a time,
it will transmit the random access message after the uplink access slot of the
last preamble. The transmit power of the random access message control part should be
POWER OFFSET higher than the power of the last transmitted preamble.
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WCDMA Power Control and Relevant Parameters
POWERRAMPSTEP
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Parameter name: Power increase step
Value range : 1 to 8
Physical Value Range: 1 to 8 dB
Content: The power increase step of the random access preambles transmitted
before the UE receives the acquisition indicator in the random access process.
Recommended value: 2
Set this parameter through ADD PRACHBASIC, query it through LST PRACH, and
modify it through MOD PRACHUUPARAS
PREAMBLERETRANSMAX
Parameter name: Max preamble retransmission
Value range : 1 to 64
Content: The maximum number of preambles transmitted in a preamble ramping
cycle.
Recommended value: 20
Set this parameter through ADD PRACHBASIC, query it through LST PRACH, and
modify it through MOD PRACHUUPARAS
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WCDMA Power Control and Relevant Parameters
MMAX
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Parameter name: Max preamble loop
Value range: 1 to 32
Content: The maximum number of random access preamble loops.
Recommended value: 8
Set this parameter through ADD RACH, query it through LST RACH, and modify it
first de-activated the cell through DEA CELL, then MOD RACH.
NB01MIN / NB01MAX
Parameter name: Random back-off lower / upper limit
Value range: 0 to 50
Content: The lower / upper limit of random access back-off delay.
The recommended value: 0 for both NB01MIN / NB01MAX
Set this parameter through ADD RACH, query it through LST RACH, and modify it
first de-activated the cell through DEA CELL, then MOD RACH.
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WCDMA Power Control and Relevant Parameters
POWEROFFSETPPM
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Parameter name: Power offset
Value range: -5 to 10dB
Content: The power offset between the last access preamble and the message
control part. The power of the message control part can be obtained by adding the
offset to the access preamble power.
The recommended value of this parameter is -3dB for signalling transmission , and
that -2dB for service transmission
Set this parameter through ADD PRACHTFC, query it through LST PRACH, and
modify it de-activated the cell through DEA CELL . After the old configuration of
PRACH is deleted through RMV PRACHTFC , a new parameters can be
established through ADD PRACHTFC
The PRACH message also consists of control part and data part, here the POWER
OFFSET is the difference between the PRACH preamble and the message control part.
The PRACH message uses GAIN FACTOR to set the power of control / data part:
GAIN FACTOR BETAC ( β c ) is the gain factor for the control part.
GAIN FACTOR BETAD ( β d ) is the gain factor for the data part.
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
According to the RRC connection establishment procedure, after RNC received the “RRC
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CONNECTION REQUEST ” message, and NodeB set up the radio link for UE, then Iub
interface resources is established between NodeB and RNC.
When DCH-FP of Iub interface finished downlink and uplink synchronization, the downlink
DPCH starts to transmit, and DPDCH initial transmission power is calculated throughopen loop power control.
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WCDMA Power Control and Relevant Parameters
In this formula, where
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R is the requested data bitrate by the user
W is the chip rate
(Eb/No) DL is the Eb/No target to ensure the service quality. RNC searches for the
(Eb/No)DL dynamically in a set of pre-defined values according to specific cell
environment type, coding type, bitrate, BLER target and etc.
(Ec/Io) CPICH is the CPICH signal quality measured by UE, then it is sent to RNC
through RACH.
α αα α is the orthogonality factor in the downlink. In Huawei implementation, α is set to
0.
P total is the total carrier transmit power measured at the NodeB
The initial transmission power of downlink DPDCH could be calculated through this
formula, then, initial transmission power of downlink DPCCH can be obtained according
to the power offset: PO1, PO2 and PO3 .
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WCDMA Power Control and Relevant Parameters
This figure shows the power offset of downlink DPCH :
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Power offset of DPCCH TFCI to DPDCH is 0
Power offset of DPCCH TPC to DPDCH is 3dB.
Power offset of DPCCH Pilot to DPDCH is 3dB.
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WCDMA Power Control and Relevant Parameters
Note: Both downlink open loop and close loop power control will be limited by this parameter.
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RLMAXDLPWR
Parameter name: RL Max DL TX power
Value range : -350 to 150
Physical Value Range:
-35 to 15 dB, step 0.1dB
Content: The maximum downlink transmit power of radio link. This parameter should fulfill
the coverage requirement of the network planning, and the value is relative to [PCPICH
transmit power]
Set this parameter through ADD CELLRLPWR , query it through LST CELLRLPWR, and
modify it through MOD CELLRLPWR
RLMINDLPWR
Parameter name: RL Min DL TX power
Value range : -350 to 150
Physical Value Range: -35 to 15 dB, step 0.1dB
Content: The minimum downlink transmit power of radio link. This parameter should
consider the maximum downlink transmit power and the dynamic range of power control,
and the value is relative to [PCPICH transmit power] .
Since the dynamic range of power control is set as 15dB, this parameter is recommended as
[RL Max DL TX power] – 15 dB.
Set this parameter through ADD CELLRLPWR, query it through LST CELLRLPWR, and
modify it through MOD CELLRLPWR
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
According to the RRC connection establishment procedure, after RNC sent the “RRC
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CONNECTION SETUP ” message, UE will try to synchronize with NodeB, and the uplink
DPCCH starts to transmit, here DPCCH initial transmission power is calculated through
open loop power control
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WCDMA Power Control and Relevant Parameters
For Huawei, DPCCH_Power_Offset is calculated with the following formula:
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Where
PCPICH Transmit Power defines the PCPICH transmit power in a cell.
UL Interference is the UL RTWP measured by the NodeB.
Default Constant Value reflects the target Ec/No of the uplink DPCCH preamble.
Valuet tanCons Default
ce InterferenULPower Transmit PCPICH Offset _Power _ DPCCH
+
+=
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WCDMA Power Control and Relevant Parameters
DEFAULTCONSTANTVALUE
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Parameter name: Constant value configured by default
Value range : -35 to -10 , unit :dB
Content: This parameter is used to obtain DPCCH_Power_Offset , which is used by
UE to calculate the initial transmit power of UL DPCCH during the open loop power
control process.
Recommended value: -22
Set this parameter through SET FRC, query it through LST FRC, and modify it
through SET FRC
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WCDMA Power Control and Relevant Parameters
MAXALLOWEDULTXPOWER
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Parameter name: Max allowed UE UL TX power
Value range: -50 to 33
Physical value range: -50 to 33 dBm. Step: 1
Content: The maximum allowed uplink transmit power of a UE in the cell, which is
related to the network planning.
Recommended value: 24
Set this parameter through ADD CELLSELRESEL, query it through LST
CELLSELRESEL, and modify it through MOD CELLSELRESEL
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WCDMA Power Control and Relevant Parameters
MAXULTXPOWERFORCONV
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Parameter name: Max UL TX power of Conversational service
MAXULTXPOWERFORSTR
Parameter name: Max UL TX power of Streaming service
MAXULTXPOWERFORINT
Parameter name: Max UL TX power of Interactive service
MAXULTXPOWERFORBAC
Parameter name: Max UL TX power of Background service
Value range: -50 to 33
Physical value range: -50 to 33 dBm. Step: 1
Content: The maximum UL transmit power for specific service in the cell, which is
related to the network planning.
Recommended value: 24
Set this parameter through ADD CELLCAC, query it through LST CELLCAC, and
modify it through MOD CELLCAC
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
Inner Loop Power Control
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The receiver compares SIR mea (measured SIR) with SIR tar (target SIR), and decide the TPC to
send.
If SIR mea is greater than SIR tar , the TPC is set as “0” to increase transmission power
If SIR mea is less than SIR tar , the TPC is set as “1” to decrease transmission power
TPC is sent to the transmitter in DPCCH, the transmitter will adjust the power according to the
value of received TPC.
Through inner loop power control, the SIR mea can be ensured to approach SIR tar .
Outer Loop Power Control
The receiver compares BLER mea (measured BLER) with BLER tar (target BLER), and decide how to
set the SIR tar .
If BLER mea is greater than BLER tar , the SIR tar is increased
If BLER mea is less than BLER tar , the SIR tar is decreased
The adjusted SIR tar is sent for the inner loop power control, then it will be used in previous process
to guide the transmitter power adjustment.
Through outer loop power control, the BLER mea can be ensured to approach BLER tar .
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
RNC sends SIR tar (target SIR) to NodeB and then NodeB compares SIR mea (measured
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SIR) with SIR tar once every timeslot.
If the estimated SIR is greater than the target SIR, NodeB sends TPC “0” to UE on
downlink DPCCH TPC field.
Otherwise, NodeB sends TPC “1” to UE.
After reception of one or more TPC in a slot, UE shall derive a single TPC_cmd (TPC
command, with value among -1,0,1):
For UE is in soft handover state, more than one TPC is received in a slot, so firstly
multiple TPC_cmd is combined.
Two algorithms could be used by the UE for deriving the TPC_cmd , those are
PCA1 and PCA2 (PCA means Power Control Algorithm).
When deriving the combined TPC_cmd , UE shall adjust the transmit power of uplink
DPCCH with a step “UL Closed Loop Power Control Step Size “, as following:
△ DPCCH = △ TPC × TPC_cmd
This adjustment is executed on the DPCCH, then associated DPDCH transmit power is
calculated according to DPDCH / DPCCH power ratio β d / β c .
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WCDMA Power Control and Relevant Parameters
When UE has single radio link, only one TPC will be received in each slot. In this case,
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the value of TPC_cmd shall be derived by PCA2 as follows:
For the first 4 slots of a set, TPC_cmd = 0.
For the fifth slot of a set, UE make the decisions on as follows:
If all 5 TPC within a group are 1, then TPC_cmd = 1 in the 5th slot.
If all 5 TPC within a group are 0, then TPC_cmd = -1 in the 5th slot.
Otherwise, TPC_cmd = 0 in the 5th slot.
According to DPCCH channel structure, there are 15 time slots in a 10ms radio frame,
and the control is performed once in each 5-slot group, so the frequency of uplink inner
loop PCA2 is 300Hz.
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WCDMA Power Control and Relevant Parameters
On the NodeB side, there are two phases during the soft handover state:
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Uplink synchronization phase
The NodeB should send durative “TPC = 1” to the newly-added RL before
successful synchronization.
Multi-radio link phase
Each NodeB and each cell will estimate the SIR individually and the general TPC
individually. Therefore, the UE may receive different TPC from different RLS.
Especially, when UE is in softer handover state, it means UE has radio links to the same
NodeB, in this case, these RLs (Radio Link) belong to the same RLS (Radio Link Set),
and the all TPCs are the same from each RL.
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WCDMA Power Control and Relevant Parameters
When UE is in soft handover state, multiple TPC will be received in each slot from
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different cells in the active set. UE will generate the TPC_cmd by PCA1 as follows:
1. Combine the TPC from the same RLS and derive the Wi
When the RLs (Radio Link) are in the same RLS (Radio Link Set), they will transmit
the same TPC in a slot. In this case, the TPC s from the same RLS shall be
combined into one.
After combination, UE will obtain a soft symbol decision Wi for each RLSi .
2. Combine the TPC from different RLSs and derive the TPC_cmd
UE derives TPC_cmd , it is based on a function γ and all the N soft symbol
decisions Wi :
TPC_cmd = γ (W 1, W 2 , … W N ),
Where TPC_cmd can only take the values 1 or -1.
In Huawei implementation, the function γ shall fulfil the following criteria:
If the TPCs from all RLSs are “1” , the output of γ shall be equal to “1” ;
If one TPC from any RLS is “0” , the output of γ shall be equal to “-1” .
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WCDMA Power Control and Relevant Parameters
The example of the uplink inner loop PCA2 in soft handover state.
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WCDMA Power Control and Relevant Parameters
PWRCTRLALG
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Parameter name: Power control algorithm selection
Value range: ALGORITHM1, ALGORITHM2
Content: This parameter is used to inform the UE of the method for translating the
received TPC commands.
Recommended value: ALGORITHM1
Set this parameter through SET FRC, query it through LST FRC, and modify it
through SET FRC
ULTPCSTEPSIZE
Parameter name: UL closed loop power control step size
Value range :1dB, 2dB
Content: The step size of the closed loop power control performed on UL DPDCH.
This parameter is mandatory when the parameter “Power control algorithm
selection” is set as "ALGORITHM1".
Recommended value: 1
Set this parameter through SET FRC, query it through LST FRC, and modify it
through SET FRC
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
Basically the downlink inner loop power control process is similar with uplink, UE L3
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sends SIR tar to UE L1 and then UE L1 compares SIR mea with SIR tar :
If the SIR mea is greater than the SIR tar , UE sends TPC “0” to NodeB on uplink
DPCCH TPC field.
Otherwise, UE sends TPC “1” to NodeB.
The UE shall check the downlink power control mode before generating the TPC , two
algorithm DPC_MODE1 and DPC_MODE2 could be used by UE to derive the TPC . Upon
receiving the TPC , NodeB shall estimate the transmitted TPC and adjust its downlink
DPCCH/DPDCH power accordingly.
After reception of one or more TPC in a slot, NodeB shall derive the estimated TPC
TPC est (k) and calculate a P TPC (k), the power adjustment of k: th slot.
Then NodeB shall adjust the current downlink power P(k-1) to a new power P(k), and
adjust the power of the DPCCH and DPDCH with the same amount, since power
difference between them is fixed.
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WCDMA Power Control and Relevant Parameters
The DPC_MODE parameter is a UE specific parameter and controlled by the UTRAN.
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The UE shall check the DPC_MODE (Downlink Power Control Mode) before generating
the TPC , and upon receiving the TPC , the UTRAN shall adjust its downlink power
accordingly.
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WCDMA Power Control and Relevant Parameters
DPCMODE
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Parameter name: Downlink power control mode
Value range: SINGLE_TPC (DPC_MODE=0), TPC_TRIPLET_IN_SOFT
(DPC_MODE=1), TPC_AUTO_ADJUST
Content:
SIGNLE_TPC , a fast power control mode, indicates that a unique TPC command is
sent in each time slot on DPCCH.
TPC_TRIPLET_IN_SOFT , a slow power control mode, indicates that the same
TPC is sent in three time slots, it is applicable to soft handover and it can decrease
the power deviation.
TPC_AUTO_ADJUST , an automatically adjusted mode, indicates that the value of
DPC_MODE can be modified by sending the message “ACTIVE SET UPDATE” to
UE.
Recommended value: SINGLE_TPC
Set this parameter through SET FRC, query it through LST FRC, and modify it
through SET FRC
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WCDMA Power Control and Relevant Parameters
If DOWNLINK_POWER_BALANCE_SWITCH is OFF , then P bal (k) equals 0.
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
From the definition above, ∆∆∆∆sum (k) indicates the sum of downlink power adjustment in the
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latest DL_Power_Average_Window_Size time slots.
Power_Raise_Limit is set to 10dB.
DL_Power_Averaging_Window_Size is set to 20 Slot.
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WCDMA Power Control and Relevant Parameters
INNER_LOOP_DL_LMTED_PWR_INC_SWITCH
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This is one switch in PcSwitch (Power control algorithm switch) parameter.
Value range : 1 (ON) , 0 (OFF)
Content: When it is checked, limited power increase algorithm is applied in the inner loop
power control. limited power increase algorithm means that when the DL transmit power isincreased, there is a limit for the step, that is, each increase is limited.
Recommended value (default value): 1
Set this parameter through SET CORRMALGOSWITCH, query it through LST
CORRMALGOSWITCH, and modify it through SET CORRMALGOSWITCH
FDDTPCDLSTEPSIZE
Parameter name: FDD DL power control step size
Value range: STEPSIZE_0.5DB, STEPSIZE_1DB, STEPSIZE_1.5DB, STEPSIZE_2DB
Physical value range: 0.5, 1, 1.5, 2 dB
Content: The step size of the closed loop power control performed on DL DPCH in
Frequency Division Duplex (FDD) mode.
Recommended value: STEPSIZE_1DB
Set this parameter through SET FRC, query it through LST FRC, and modify it through SET
FRC
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WCDMA Power Control and Relevant Parameters
During soft handover, the UL TPC is demodulated in each RLS, then due to demodulation
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errors, the DL transmit power of the each branch in soft handover will drift separately,
which causes loss to the macro-diversity gain.
The DL Power Balance (DPB) algorithm is introduced to reduce the power drift between
links during the soft handover.
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WCDMA Power Control and Relevant Parameters
DOWNLINK_POWER_BALANCE_SWITCH
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This is one switch in PcSwitch (Power control algorithm switch) parameter.
Value range : 1 (ON) , 0 (OFF)
Content: When it is checked, Downlink Power Balance (DPB) algorithm is applied to RNC.
Downlink power drift among different RLs, which is caused by TPC bit error or other reasons,
could reduce the gain of soft handover. DPB is mainly used to balance the downlink powerof different RLs for an UE in order to achieve the best gain of soft handover.
Recommended value (default value): 1, ON
Set this parameter through SET CORRMALGOSWITCH, query it through LST
CORRMALGOSWITCH, and modify it through SET CORRMALGOSWITCH
DPBSTARTTHD / DPBSTOPTHD
Parameter name: DPB start threshold / DPB stop threshold
Value range: 0~255
Physical value range: 0~127.5dB; step: 0.5
Content: The threshold of start / stop DL power balancing in soft handover. When the
difference of the power values of every two paths is greater / smaller than or equal to this
threshold in soft handover, the RNC shall start / stop DL power balancing; otherwise, shall
not.
The recommended value is DPB start threshold 8, namely 4dB; DPB stop threshold 4,
namely 2dB;
Set this parameter through SET DPB, query it through LST DPB and modify it through SET
DPB
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters
The reason of outer loop power control
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The QoS which NAS provides to CN is BLER, not SIR
The relationship between inner loop power control and outer loop power control
SIRtar should be satisfied with the requirement of decoding correctly. But different
multi-path radio environments request different SIR
Therefore, the outer loop power control can adjust the SIR to get a stable BLER in
the changeable radio environment
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WCDMA Power Control and Relevant Parameters
Uplink outer-loop power control is performed in the SRNC. The SRNC measures the
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received BLER and compares it with the BLER tar . If the BLER mea is greater than the
BLER tar , the SRNC increases the SIR tar ; otherwise, the SRNC decreases the SIR tar .
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WCDMA Power Control and Relevant Parameters
The initial SIR target value is transmitted to the NodeB by using NBAP signaling of each
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RADIO LINK SETUP or RADIO LINK RECONFIGURATION PREPARE messages
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WCDMA Power Control and Relevant Parameters
According to the formula above,
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SIR tar (n) is the target SIR used for the n:th adjustment period.
MAX means the maximum value among the total i transmission channels.
BLER meas,i (n) is measured for the i:th transmission channel in the n:th adjustment
period.
BLER tar,i is the target BLER of the i:th transmission channel.
Step i is the adjustment step of the i:th transmission channel.
Factor is the adjustment factor.
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WCDMA Power Control and Relevant Parameters
Where,
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∆SIR tar is the adjustment of SIR tar , and ∆SIR tar = SIR tar (n+1) - SIR tar (n)
ABS( ∆SIR tar ) means absolute value of ∆SIR tar
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WCDMA Power Control and Relevant Parameters
Where,
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CSD: CS domain Data service
I/B: Interactive and Background.
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WCDMA Power Control and Relevant Parameters
OLPC_SWITCH
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This is one switch in PCSWITCH (Power control algorithm switch) parameter.
Value range: 1 (ON) , 0 (OFF)
Comments: When it is checked, RNC updates the uplink SIR TARGET of RLs on
the NodeB side by Iub DCH FP signals
Default value: 1
Set this parameter through SET CORRMALGOSWITCH, query it through LST
CORRMALGOSWITCH, and modify it through SET CORRMALGOSWITCH
INITSIRTARGET
Parameter name: Initial SIR target value
Value range: 0 to 255
Physical value range: -8.2 to +17.3 dB, step 0.1
Content: Defining the initial SIR target value of outer loop power control.
Recommended value: refer to the following table.
Set this parameter through ADD TYPSRBOLPC / ADD TYPRABOLPC, query it
through LST TYPSRB / LST TYPRAB, and modify it through MOD TYPSRBOLPC /
MOD TYPRABOLPC
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WCDMA Power Control and Relevant Parameters
The downlink outer loop power control is implemented inside the UE. Therefore, this
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algorithm is specified by UE manufacturer.
Generally, the UE L3 measures the received BLER and compares it with the BLER tar . If
the BLER mea is greater than the BLER tar , the L3 increases the SIR tar and send it to UE L1;
otherwise, the L3 decreases the SIR tar .
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WCDMA Power Control and Relevant Parameters
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WCDMA Power Control and Relevant Parameters