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标题: 5G NR power control [查看完整版帖子] [打印本页]
时间: 2021-6-26 21:26
作者: xianlzha
标题: 5G NR power control
Power Control
Ina big picture, the power control of 3G(WCDMA/HSPA) , 4G(LTE) and 5G(NR) arealmost same. If you have a good understandings on power control concept andmechnisnm of 3G or 4G, you will not have much difficulties in understanding 5Gpower control.
How PRACH Power is determined ?
Main part of PRACHpower is defined in 38.213-7.4 as follows and you need to refer to severalother specification for complete understanding of the equation.
This equation simplysays
i)Calculate P_PRACH,target,f,c + PL_b,f,c
ii)Compare the calculated power(P_PRACH,target,f,c + PL_b,f,c) with P_CMAX,f,c
iii)If the calculated power(P_PRACH,target,f,c + PL_b,f,c) is greater thanP_CMAX,f,c, use P_CMAX,f,c. If the calculated poewr is lower than P_CMAX,f,c,then use the calculated power.
- P-EMAX,c : determined by p-Max in RRC message
- P_PowerClass : specified in the following table.
<38.101-1 : Table 6.2.1-1: UE Power Class >
< 38.101-2 v15.3Table 6.2.1.1-2: UE maximum output power limits for power class 1 >
< 38.101-2 v15.3Table 6.2.1.2-2: UE maximum output power limits for power class 2 >
< 38.101-2 v15.3Table 6.2.1.2-2: UE maximum output power limits for power class 2 >
< Determination ofreferenceSignalPower >
The description inthis section is largely based on 38.213 - 7.4
Case 1 : In one ofthe following condition
- PRACH transmission from a UE is not in response to a detection of a PDCCH order by the UE
- PRACH transmission from a UE is in response to a detection of a PDCCH order by the UE that triggers a contention based random access procedure
- PRACH transmission from a UE is associated with a link recovery procedure where a corresponding index q_new is associated with a SS/PBCH block
Then,
referenceSignalPower is determined by ss-PBCH-BlockPower
Case 2 : In oneof the following condition
- PRACH transmission from a UE is in response to a detection of a PDCCH order by the UE that triggers a noncontention based random access procedure and depends the DL RS that the DM-RS of the PDCCH order is quasicollocated.
Then,
referenceSignalPower is determined by ss-PBCH-BlockPower
Case 3 : In oneof the following condition
- PRACH transmission from a UE is in response to a detection of a PDCCH order by the UE that triggers a noncontention based random access procedure and the UE is configured resources for a periodic CSI-RS reception or the PRACH transmission is associated with a link recovery procedure where a corresponding index q_new is associated with a periodic CSI-RS configuration.
Then,
referenceSignalPower is determined by ss-PBCH-BlockPower and powerControlOffsetSS
,where powerControlOffsetSS (in RRC) is an offset of CSI-RS transmission powerrelative to SS/PBCH block transmission power.
ifpowerControlOffsetSS is not provided by RRC, UE assumes that this value is 0 dB
< Determination of PREAMBLE_RECEIVED_TARGET_POWER >
PREAMBLE_RECEIVED_TARGET_POWERis determined by following equation (38.321 - 5.1.3)
PREAMBLE_RECEIVED_TARGET_POWER
=preambleReceivedTargetPower (in RRC)
+DELTA_PREAMBLE
+(PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP
< 38.321 V15.3.0- Table 7.3-1: DELTA_PREAMBLE values for long preamble formats. >
< 38.321 V15.3.0- Table 7.3-2: DELTA_PREAMBLE values for short preamble formats. >
How msg3 Power is determined ?
msg3 Power isdetermined by following equation.
How PUSCH Power is determined ?
RRC Parameters involved in Power Control
38.331v15.3.0
FrequencyInfoUL-SIB ::= SEQUENCE {
frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Cond FDD-OrSUL
absoluteFrequencyPointA ARFCN-ValueNR OPTIONAL, -- Cond FDD-OrSUL
scs-SpecificCarrierList SEQUENCE (SIZE (1..maxSCSs)) OFSCS-SpecificCarrier,
p-Max P-Max OPTIONAL, -- Need S
frequencyShift7p5khz ENUMERATED{true} OPTIONAL, -- Cond FDD-OrSUL-Optional
...
}
ServingCellConfigCommonSIB ::= SEQUENCE {
supplementaryUplink UplinkConfigCommonSIB OPTIONAL, -- Need R
n-TimingAdvanceOffset ENUMERATED{ n0, n25560, n39936 } OPTIONAL, -- Need S
ssb-PositionsInBurst SEQUENCE{
inOneGroup BITSTRING (SIZE (8)),
groupPresence BITSTRING (SIZE (8)) OPTIONAL-- Cond Above6GHzOnly
},
ssb-PeriodicityServingCell ENUMERATED{ms5, ms10, ms20, ms40, ms80, ms160},
tdd-UL-DL-ConfigurationCommon TDD-UL-DL-ConfigCommon OPTIONAL, -- Cond TDD
ss-PBCH-BlockPower INTEGER(-60..50),
...
}
RACH-ConfigGeneric ::= SEQUENCE {
prach-ConfigurationIndex INTEGER(0..255),
msg1-FDM ENUMERATED{one, two, four, eight},
msg1-FrequencyStart INTEGER(0..maxNrofPhysicalResourceBlocks-1),
zeroCorrelationZoneConfig INTEGER(0..15),
preambleReceivedTargetPower INTEGER(-200..-74),
preambleTransMax ENUMERATED{n3,n4,n5,n6,n7,n8,n10,n20,n50,n100,n200},
powerRampingStep ENUMERATED{dB0, dB2, dB4, dB6},
ra-ResponseWindow ENUMERATED{sl1, sl2, sl4, sl8, sl10, sl20, sl40, sl80}
}
NZP-CSI-RS-Resource::= SEQUENCE {
nzp-CSI-RS-ResourceId NZP-CSI-RS-ResourceId,
resourceMapping CSI-RS-ResourceMapping,
powerControlOffset INTEGER(-8..15),
powerControlOffsetSS ENUMERATED{db-3,db0, db3, db6},
scramblingIDScramblingId,
periodicityAndOffset CSI-ResourcePeriodicityAndOffset
qcl-InfoPeriodicCSI-RS TCI-StateIdOPTIONAL, -- Cond Periodic
...
}
PUSCH-ConfigCommon::= SEQUENCE {
groupHoppingEnabledTransformPrecoding ENUMERATED {enabled} OPTIONAL,
pusch-TimeDomainAllocationList PUSCH-TimeDomainResourceAllocationList
msg3-DeltaPreamble INTEGER(-1..6)
p0-NominalWithGrant INTEGER(-202..24)
...
}
PUSCH-Config::= SEQUENCE {
dataScramblingIdentityPUSCH INTEGER(0..1023) OPTIONAL,
txConfig ENUMERATED{codebook, nonCodebook}
dmrs-UplinkForPUSCH-MappingTypeA SetupRelease{ DMRS-UplinkConfig }
dmrs-UplinkForPUSCH-MappingTypeB SetupRelease{ DMRS-UplinkConfig }
frequencyHopping ENUMERATED{intraSlot, interSlot}
frequencyHoppingOffsetLists SEQUENCE(SIZE (1..4)) OF
INTEGER(1.. maxNrofPhysicalResourceBlocks-1)
resourceAllocation ENUMERATED{ resourceAllocationType0,
resourceAllocationType1,
dynamicSwitch},
pusch-TimeDomainAllocationList SetupRelease{
PUSCH-TimeDomainResourceAllocationList
}
pusch-AggregationFactor ENUMERATED{ n2, n4, n8 }
mcs-Table ENUMERATED{qam256, qam64LowSE}
mcs-TableTransformPrecoder ENUMERATED{qam256, qam64LowSE}
transformPrecoder ENUMERATED{enabled, disabled}
codebookSubset ENUMERATED{fullyAndPartialAndNonCoherent,
partialAndNonCoherent,
nonCoherent}
maxRank INTEGER(1..4)
rbg-Size ENUMERATED{ config2}
uci-OnPUSCH SetupRelease{ UCI-OnPUSCH }
tp-pi2BPSK ENUMERATED{enabled}
...
}
PUSCH-PowerControl ::=SEQUENCE {
tpc-Accumulation ENUMERATED{ disabled } OPTIONAL, -- Need S
msg3-Alpha Alpha OPTIONAL, -- Need S p0-NominalWithoutGrant INTEGER(-202..24) OPTIONAL, -- Need M
p0-AlphaSets SEQUENCE(SIZE (1..maxNrofP0-PUSCH-AlphaSets))
pathlossReferenceRSToAddModList SEQUENCE (SIZE (1..maxNrofPUSCH-PathlossReferenceRSs))
pathlossReferenceRSToReleaseList SEQUENCE (SIZE (1..maxNrofPUSCH-PathlossReferenceRSs))
OF PUSCH-PathlossReferenceRS-Id OPTIONAL,
twoPUSCH-PC-AdjustmentStates ENUMERATED {twoStates} OPTIONAL, -- Need S
deltaMCS ENUMERATED{enabled} OPTIONAL, -- Need S
sri-PUSCH-MappingToAddModList SEQUENCE (SIZE (1..maxNrofSRI-PUSCH-Mappings))
sri-PUSCH-MappingToReleaseList SEQUENCE (SIZE (1..maxNrofSRI-PUSCH-Mappings))
OFSRI-PUSCH-PowerControlId OPTIONAL -- Need N
}
P0-PUSCH-AlphaSet ::=SEQUENCE {
p0-PUSCH-AlphaSetId P0-PUSCH-AlphaSetId,
p0 INTEGER(-16..15) OPTIONAL, -- Need S
alpha AlphaOPTIONAL -- Need S
}
Alpha ::= ENUMERATED{alpha0, alpha04, alpha05, alpha06, alpha07, alpha08, alpha09, alpha1}
P0-PUSCH-AlphaSetId::= INTEGER (0..maxNrofP0-PUSCH-AlphaSets-1)
PUSCH-PathlossReferenceRS::= SEQUENCE {
pusch-PathlossReferenceRS-Id PUSCH-PathlossReferenceRS-Id,
referenceSignalCHOICE {
ssb-Index SSB-Index,
csi-RS-Index NZP-CSI-RS-ResourceId
}
}
PUSCH-PathlossReferenceRS-Id::= INTEGER (0..maxNrofPUSCH-PathlossReferenceRSs-1)
SRI-PUSCH-PowerControl ::=SEQUENCE {
sri-PUSCH-PowerControlId SRI-PUSCH-PowerControlId,
sri-PUSCH-PathlossReferenceRS-Id PUSCH-PathlossReferenceRS-Id,
sri-P0-PUSCH-AlphaSetId P0-PUSCH-AlphaSetId,
sri-PUSCH-ClosedLoopIndex ENUMERATED { i0, i1 }
}
SRI-PUSCH-PowerControlId::= INTEGER (0..maxNrofSRI-PUSCH-Mappings-1)
BetaOffsets ::= SEQUENCE {
betaOffsetACK-Index1 INTEGER(0..31)OPTIONAL, -- Need S
betaOffsetACK-Index2 INTEGER(0..31)OPTIONAL, -- Need S
betaOffsetACK-Index3 INTEGER(0..31)OPTIONAL, -- Need S
betaOffsetCSI-Part1-Index1 INTEGER(0..31) OPTIONAL, -- Need S
betaOffsetCSI-Part1-Index2 INTEGER(0..31) OPTIONAL, -- Need S
betaOffsetCSI-Part2-Index1 INTEGER(0..31) OPTIONAL, -- Need S
betaOffsetCSI-Part2-Index2 INTEGER(0..31) OPTIONAL -- Need S
}
PUCCH-Config::= SEQUENCE {
resourceSetToAddModList SEQUENCE(SIZE (1..maxNrofPUCCH-ResourceSets)) OF
PUCCH-ResourceSet OPTIONAL, --Need N
resourceSetToReleaseList SEQUENCE(SIZE (1..maxNrofPUCCH-ResourceSets)) OF
PUCCH-ResourceSetId OPTIONAL, --Need N
resourceToAddModList SEQUENCE(SIZE (1..maxNrofPUCCH-Resources)) OF
PUCCH-Resource OPTIONAL, --Need N
resourceToReleaseList SEQUENCE(SIZE (1..maxNrofPUCCH-Resources)) OF
PUCCH-ResourceId OPTIONAL, --Need N
format1 SetupRelease{ PUCCH-FormatConfig } OPTIONAL, -- Need M
format2 SetupRelease{ PUCCH-FormatConfig } OPTIONAL, -- Need M
format3 SetupRelease{ PUCCH-FormatConfig } OPTIONAL, -- Need M
format4 SetupRelease{ PUCCH-FormatConfig } OPTIONAL, -- Need M
schedulingRequestResourceToAddModList SEQUENCE(SIZE (1..maxNrofSR-Resources)) OF
SchedulingRequestResourceConfig OPTIONAL, -- NeedM
schedulingRequestResourceToReleaseList SEQUENCE(SIZE (1..maxNrofSR-Resources)) OF
SchedulingRequestResourceId OPTIONAL,-- Need M
multi-CSI-PUCCH-ResourceList SEQUENCE(SIZE (1..2)) OF PUCCH-ResourceId OPTIONAL,-- Need M
dl-DataToUL-ACK SEQUENCE(SIZE (8)) OF INTEGER (0..15) OPTIONAL, --Need M
spatialRelationInfoToAddModList SEQUENCE(SIZE (1..maxNrofSpatialRelationInfos)) OF
PUCCH-SpatialRelationInfo OPTIONAL, --Need N
spatialRelationInfoToReleaseList SEQUENCE(SIZE (1..maxNrofSpatialRelationInfos)) OF
PUCCH-SpatialRelationInfoId OPTIONAL, --Need N
...
}
PUCCH-PowerControl ::=SEQUENCE {
deltaF-PUCCH-f0 INTEGER(-16..15) OPTIONAL, -- Need R
deltaF-PUCCH-f1 INTEGER(-16..15) OPTIONAL, -- Need R
deltaF-PUCCH-f2 INTEGER(-16..15) OPTIONAL, -- Need R
deltaF-PUCCH-f3 INTEGER(-16..15) OPTIONAL, -- Need R
deltaF-PUCCH-f4 INTEGER(-16..15) OPTIONAL, -- Need R
p0-Set SEQUENCE(SIZE (1..maxNrofPUCCH-P0-PerSet))
pathlossReferenceRSs SEQUENCE (SIZE(1..maxNrofPUCCH-PathlossReferenceRSs))
twoPUCCH-PC-AdjustmentStates ENUMERATED {twoStates} OPTIONAL, -- Need S
...
}
P0-PUCCH::= SEQUENCE {
p0-PUCCH-Id P0-PUCCH-Id,
p0-PUCCH-Value INTEGER(-16..15)
}
P0-PUCCH-Id::= INTEGER (1..8)
PUCCH-PathlossReferenceRS ::=SEQUENCE {
pucch-PathlossReferenceRS-Id PUCCH-PathlossReferenceRS-Id,
referenceSignalCHOICE {
ssb-Index SSB-Index,
csi-RS-Index NZP-CSI-RS-ResourceId
}
}
附件: NR_PowerControl_PUSCH_01.png (2021-6-26 21:20, 71 KB) / 下载次数 0
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