spd_huawei eran6.0 power control feature introduction
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8/10/2019 SPD_Huawei ERAN6.0 Power Control Feature Introduction
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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level:
Huawei eRAN3.0Power Control Feature
Introduction
Zhuxiyun / 00167826
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Content
Introduction
UPLINK POWER CONTROL
DOWNLINK POWER CONTROL
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UPLINK POWER CONTROL: OVERVIEW
Uplink power control is performed on uplink physical signals, traffic
channels, and control channels. It includes power control for the
following signals and channels:
Physical random access channel (PRACH)
Physical uplink shared channel (PUSCH)
Physical uplink control channel (PUCCH)
Sounding reference signal (SRS)
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Power Control for the PRACH
CMAX P
)(i PUSCH M
is the maximum allowed transmit power.
is the number of physical resource blocks (PRB) allocated.
is cell/UE specific parameter signaled by radio resource control (RRC).
is the ramping step in power ramping of the preamble.
is the downlink path loss estimate. It is calculated in the UE based on the
reference symbol received power (RSRP). PL = RS - RSRP
is the number of times the UE sends the preamble.
PL
})1(,min{ _ step pre preamble preoCMAX PRACH N PL P P P
preo P
_
}))(log(10,min{ 23 _ O_pre3 msg TF Msg PREAMBLE PUSCH CMAX MSG PL P i M P P
preamble is the offset of the power for the current preamble format against preamble format 0.
pre N
step
3 _ Msg PREAMBLE is the preamble delta value of Msg3.
TF is the offset of the power for the current MCS format against the reference MCS format.
2msg is the TPC command
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Power Control for the PRACH
eNB Initial ly sets PRACH preamble expected
received power
UE estimates dow nl ink path loss
UE sets the PRACH transmit pow er according
eNB parameter and path loss
I f the random access preamble attempt fai ls ,UE
can increase the transmit power for the next RA
preamble attempt
C
eNB
A B
preamble
preamble
preamble
CELL
minimize
transmit
power
ensure therandom access
success rate and
latency
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Power Control for the PUSCH
)}()()()log(10,min{ PUSCH _ 0)(maxTX i f PL j j P M P P i PUSCH
MAX P
)(i PUSCH M
0 P
is the maximum allowed transmit power.
is the number of physical resource blocks (PRB) allocated.
is cell/UE specific parameter signaled by radio resource control (RRC).
is the path loss compensation factor.
is the downlink path loss estimate. It is calculated in the UE based on the
reference symbol received power (RSRP). PL = RS - RSRP
is a closed loop correction value TPC and f is a function that permits to use
accumulate or absolute correction value.
)( j
PL
)(i f
)()()()log(10PHR PUSCH _ 0)(ma x i f PL j j P M P i PUSCH
•Power headroom for the UE
•The closest value in the range [40; -23] dB with steps of 1 dB
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Power Control for the PUSCH
When UL power is limited, how to allocate RB
and MCS to achieve better UL throughput?More RB,
lower MCS or few RB, higher MCS?
PHR : Power Headroom Report
PL : Path Loss
TPC : Transmit Power Command
Outer
Loop
Control
Consider PL, RB, QoS, etc.
Compared with PSD
PSD Target
eNodeB UE
PHR
TPC Inner
Loop
Control
NEARPOINT
FARPOINT
MIDPOINT
limiting UE power
reduce RB
Carring all RB,so
easy!
Reduing R
SHARE RB
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Power Control for the PUCCH
CMAX P
PUCCH P _ 0
is the maximum allowed transmit power.
is the receive power expected by the eNodeB.
is the downlink path loss estimate. It is calculated in the UE based on the
reference symbol received power (RSRP). PL = RS - RSRP
is determined by the PUCCH format. nCQI is the number of information bits ofthe CQI and nHARQ is the number of information bits of HARQ,
is the current PUCCH power control adjustment state.
PL
)(i g
i g F nnh PL P P i P HARQCQI F_PUCCH0_PUCCHCMAXPUCCH ,,min
HARQCQI nnh ,
)( _ F PUCCH F reflects the transmission format of the PUCCH on the transmit power.
ensure the
PUCCH
performance
ACK/NACK
CQI: RI(Rank Indicator )
CQI(Channel Quality Indicator )
PMI(Precoding Matrix Information)
SRI : Scheduling Request Indication
PUCCH FUNCTION
reduce the
interference to
neighboring
cells
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Power Control for the Sounding
Reference Signals
CMAX P
SRS M
pusch P _ 0
is the maximum allowed transmit power.
is the number of physical resource blocks (PRB) allocated.
is cell/UE specific parameter signaled by radio resource control (RRC).
is the path loss compensation factor.
is the downlink path loss estimate. It is calculated in the UE based on the
reference symbol received power (RSRP). PL = RS - RSRP
is the offset of the SRS power against the PUSCH power.
PL
)(i f
)}()log(10,min{)( _ 0 _ CMAX
i f PL P P M P i P PUSCH OFFSET SRS SRS SRS
I am SRS
Power! I willfollow you
I am PUSCH
Power!
is a closed loop correction value TPC and f is a function that permits to use
accumulate or absolute correction value.
OFFSET SRS P
_
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Uplink Power Control formula summary
Power Control for the PRACH
Power Control for the PUSCH
Power Control for the PUCCH
Power Control for the SRS
})1(,min{ _ step pre preamble preoCMAX PRACH
N PL P P P
}))(log(10,min{23 _ O_pre3 msg TF Msg PREAMBLE PUSCH CMAX MSG
i M PL P P P
)}()log(10)()(,min{)(PUSCH _ 0ma xTX
i f M PL j j P P P i PUSCH
)}()log(10,min{)( _ _ 0CMAX
i f P M PL P P i P OFFSET SRS SRS PUSCH SRS
i g F nnh PL P P i P HARQCQI
F_PUCCH0_PUCCHCMAXPUCCH
,,min
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Key Parameters Introduction
Id Name Description Recommended
Value
MML
P0NominalPUCCH P0 nominal PUCCH Indicates the target UE transmit power for the
PUCCH expected by the eNodeB on
condition that normal demodulation can be
performed.
-105 LST
CELLULPCCOM
M
PSrsOffsetDeltaMcs
Disable
PSrsOffset when
DeltaMcsEnalbed is
UU_DISABLE
Indicates the power offset of the sounding
reference signal to the PUSCH when
DeltaMcsEnabled is set to UU_DISABLE.
-30 LST
CELLULPCDEDI
C
PassLossCoeff Path loss coefficient Indicates the compensation factor for path
loss. It is used in UL power control.
AL07(0.7) LST
CELLULPCCOM
M
P0NominalPUSCH P0 nominal PUSCH Indicates the nominal P0 value of the PUSCH.
It is used in UL power control.
-67 LST
CELLULPCCOM
M
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Feature Relationship Introduction
The uplink power control algorithm provides the uplink scheduling algorithm with the power
headroom for the UE.
The uplink scheduling algorithm provides the uplink power control algorithm with the TBSand the number of allocated RBs, based on which UE power is set. In addition, the uplink
scheduling algorithm provides information such as the PUCCH format and SRS resource
amount for related power setting.
The VoIP semi-persistent scheduling algorithm provides the uplink power control algorithm
with the BLER that is reached in semi-persistent scheduling mode. The BLER is a
prerequisite for enabling PUSCH power adjustment in semi-persistent scheduling.
The random access procedure provides the uplink power control algorithm with information
such as the preamble format and the number of times the UE sends the preamble
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Feature Gain Introduction
0
5
10
15
20
25
30
35
40
45
50
90 100 110 120 130
T p u t / m b p s
PL/dB
Single UE, CLPC vs OLPC
CLPC OLPC
CLOSELOOP, keep
RB number
OPENLOOP,RB reduce
quickly
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Feature Monitoring Introduction
M2000
PROBE
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Content
Introduction
UPLINK POWER CONTROL
DOWNLINK POWER CONTROL
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DOWNLINK POWER CONTROL: OVERVIEW
Downlink power control is achieved using either of thefollowing techniques:Fixed power assignment
Fixed power assignment is applicable to the cell-specific reference signal, synchronization
signal, PBCH, PCFICH, and the PDCCH and PDSCH that carry common information of the cell.
Users configure fixed power based on channel quality. The configured power must meet the
requirements for the downlink coverage of the cell.
Dynamic power control
Dynamic power control is applicable to the PHICH and the PDCCH and PDSCH that carry
dedicated information sent to UEs. Dynamic power control lowers interference, expands cell
capacity, and increases coverage while meeting users' quality of service (QoS) requirements.
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Power Allocation for the PDSCH
P A=E A/ERS
ρa = E A
/ERS,ρb = E
B/E
RS
type A :during a symbol period when there
is no reference signal.
type B :during a symbol period when there
are reference signals.
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Power Allocation for the PDCCH
eNB
UE#1
UE#2
Large Tx power on PDCCHto control the Bler
convergence the Bler targetSmall Tx power on
PDCCH to control the
Bler convergence the
Bler target
UE#3PDCCH Power and CCE
combined design to improve
the PDCCH capacity and to
control the Bler convergence
the Bler target
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Key Parameters Introduction
Id Name Description Recommended Value MML
ReferenceSign
alPwr
Reference signal
power
Indicates the reference signal power of
the cell
None LST PDSCHCFG
PaPcOff PA for even power
distribution
Indicates the PA when the power
control for the PDSCH is disabled, the
downlink ICIC is disabled, and the even
power distribution is used for thePDSCH
Dual-antenna or four-antenna:
-3 dB,Single antenna: 0 dB
LST
CELLDLPCPDSCHP
A
Pb Pb Indicates the scaling factor index of the
Energy Per Resource Element (EPRE)
on the PDSCH. This scaling factor is
determined by the value of this
parameter and the antenna port.
Single-antenna: 0; double-
antenna: 1
LST PDSCHCFG
DlPcAlgoSwitch
Downlink powercontrol algorithm
switch
Indicates the switches used to enable ordisable power control for PDSCH,
PDCCH, and PHICH.
PdschSpsPcSwitch:OffPhichInnerLoopPcSwitch:Off
PdcchPcSwitch: Off (for an
FDD cell) or On (for a TDD
cell)
LSTCELLALGOSWITCH
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Feature Relationship Introduction
Downlink power control is depends on downlink scheduling because the downlink
scheduling algorithm provides the downlink power control algorithm with information
such as the PDCCH DCI format, type of information carried on the PDSCH, and QoS of
UEs.
The CQI adjustment algorithm provides the adjusted CQI for the downlink power
control algorithm.
The VoIP semi-persistent scheduling algorithm provides the downlink power control
algorithm with the BLER that is reached in semi-persistent scheduling mode. The
BLER is a prerequisite for enabling PDSCH power adjustment in semi-persistent
scheduling.
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Feature Monitoring Introduction
M2000
RRC_SYS_INFO
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