5G/NR - Power Definition / Measurement

Power Definition / Measurement

As in LTE, the most important criteria on Power Measurement is around RSRP, RSRQ. The basic idea on RSRP/RSRQ in NR is also similar to LTE RSRP / RSRQ. However, there are some differences as well between LTE and NR in terms of power definition and measurement as below.

In NR, SINR seems to be an important power criteria. Of course, SINR is not a new parameter in NR. It is measured in most of LTE chips and this is one of the parameters that I most frequently check when I am doing physical layer performance troubleshooting. However, in NR SINR has become a formal measurement parameter used in RRC message.
In LTE, RSRP and RSRQ is based on Cell specific Reference Signal (CRS). However, in NR there is no CRS. So RSRP / RSRQ definition in NR is based on other physical signals as shown in the following table.

< Based on 38.215 - 5.1 UE measurement capabilities >

Category	Physical Signal for Measurement
RSRP	SS reference signal received power (SS-RSRP)
	CSI reference signal received power (CSI-RSRP)
	SRS reference signal received power (SRS-RSRP)
RSRQ	SS reference signal received quality (SS-RSRQ)
RSRQ	CSI reference signal received quality (CSI-RSRQ)
SINR	SS signal-to-noise and interference ratio (SS-SINR)
SINR	CSI signal-to-noise and interference ratio (CSI-SINR)
RSSI

Measurement Items in RRC - MeasObjectNR

MeasObjectNR ::= SEQUENCE {

carrierFreq ARFCN-ValueNR,

referenceSignalConfig ReferenceSignalConfig OPTIONAL,

absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL,

absThreshCSI-RS-Consolidation ThresholdNR OPTIONAL,

nroSS-BlocksToAverage INTEGER (2..maxNroSS-

BlocksToAverage) OPTIONAL,

nroCSI-RS-ResourcesToAverage INTEGER (2..maxNroCSI-RS-

ResourcesToAverage) OPTIONAL,

quantityConfigIndex INTEGER (1..maxQuantityConfigId),

offsetFreq Q-OffsetRangeList,

cellsToRemoveList CellIndexList OPTIONAL,

cellsToAddModList CellsToAddModList OPTIONAL,

blackCellsToRemoveList CellIndexList OPTIONAL,

blackCellsToAddModList BlackCellsToAddModList OPTIONAL,

whiteCellsToRemoveList CellIndexList OPTIONAL,

whiteCellsToAddModList WhiteCellsToAddModList OPTIONAL

}

ReferenceSignalConfig::= SEQUENCE {

ssb-MeasurementTimingConfiguration SSB-MeasurementTimingConfiguration OPTIONAL,

ssbPresence CHOICE {

present SEQUENCE {

frequencyOffset TYPE_FFS!

subcarrierSpacing SubcarrierSpacing,

notPresent SEQUENCE {

}

csi-rs-ResourceConfig-Mobility CSI-RS-ResourceConfig-Mobility OPTIONAL -- Need

useServingCellTimingForSync BOOLEAN

}

SSB-MeasurementTimingConfiguration ::= SEQUENCE {

periodicityAndOffset CHOICE {

sf5 INTEGER (0..4),

sf10 INTEGER (0..9),

sf20 INTEGER (0..19),

sf40 INTEGER (0..39),

sf80 INTEGER (0..79),

sf160 INTEGER (0..159)

duration ENUMERATED { sf1, sf5 },

ssb-ToMeasure SetupRelease {

CHOICE {

shortBitmap BIT STRING (SIZE (4)),

mediumBitmap BIT STRING (SIZE (8)),

longBitmap BIT STRING (SIZE (64))

}

} OPTIONAL, -- Need M

smtc2 SEQUENCE {

pci-List SEQUENCE (SIZE (1..maxNrofPCIsPerSMTC)) OF PhysicalCellId OPTIONAL

periodicty TYPE_FFS!

} OPTIONAL -- Cond IntraFreqConnected

}

CSI-RS-ResourceConfig-Mobility ::= SEQUENCE {

csi-rs-MeasurementBW SEQUENCE {

csi-rs-measurementBW-size ENUMERATED { size24, size48, size96, size192, size268},

csi-rs-measurement-BW-start ENUMERATED {ffsTypeAndValue},

associated-SSB ENUMERATED {ffsTypeAndValue},

qcled-SSB BOOLEAN,

isServingCellMO BOOLEAN

}

subcarrierSpacing SubcarrierSpacing,

csi-rs-ResourceList-Mobility SEQUENCE (SIZE (1..maxNrofCSI-RS-ResourcesRRM)) OF

CSI-RS-Resource-Mobility

}

CSI-RS-Resource-Mobility SEQUENCE {

csi-rs-ResourceId-RRM CSI-RS-ResourceId-RRM,

cellId PhysicalCellId,

}

slotConfig CHOICE {

ms5 INTEGER (0..4),

ms10 INTEGER (0..9),

ms20 INTEGER (0..19),

ms40 INTEGER (0..39),

ms80 INTEGER (0..79),

ms160 INTEGER (0..159)

sequenceGenerationConfig TYPE_FFS!

}

CSI-RS-ResourceId-RRM ::= INTEGER (0..maxNrofCSI-RS-ResourcesRRM-1)

Q-OffsetRangeList ::= SEQUENCE {

rsrpOffsetSSB Q-OffsetRange DEFAULT dB0,

rsrqOffsetSSB Q-OffsetRange DEFAULT dB0,

sinrOffsetSSB Q-OffsetRange DEFAULT dB0,

rsrpOffsetCSI-RS Q-OffsetRange DEFAULT dB0,

rsrqOffsetCSI-RS Q-OffsetRange DEFAULT dB0,

sinrOffsetCSI-RS Q-OffsetRange DEFAULT dB0

}

ThresholdNR ::= SEQUENCE{

threshold-RSRP RSRP-Range OPTIONAL,

threshold-RSRQ RSRQ-Range OPTIONAL,

threshold-SINR SINR-Range OPTIONAL

}

CellsToAddModList ::= SEQUENCE (SIZE (1..maxNrofCellMeas)) OF CellsToAddMod

CellsToAddMod ::= SEQUENCE {

cellIndex INTEGER (1..maxNrofCellMeas),

physCellId PhysCellId,

cellIndividualOffset Q-OffsetRangeList

}

BlackCellsToAddModList ::= SEQUENCE (SIZE (1..maxNrofCellMeas)) OF BlackCellsToAddMod

BlackCellsToAddMod ::= SEQUENCE {

cellIndex INTEGER (1..maxNrofCellMeas),

physCellIdRange PhysCellIdRange

}

WhiteCellsToAddModList ::= SEQUENCE (SIZE (1..maxNrofCellMeas)) OF WhiteCellsToAddMod

WhiteCellsToAddMod ::= SEQUENCE {

cellIndex INTEGER (1..maxNrofCellMeas),

physCellIdRange PhysCellIdRange

}

Measurement Items in RRC - MeasResults

MeasResults ::= SEQUENCE {

measId MeasId,

measResultServingFreqList MeasResultServFreqList,

measResultNeighCells CHOICE {

measResultListNR MeasResultListNR,

measResultListEUTRA MeasResultListEUTRA,

...

} OPTIONAL

}

MeasResultServFreqList ::= SEQUENCE (SIZE (1..maxServCell)) OF MeasResultServFreq

MeasResultServFreq ::= SEQUENCE {

servFreqId ServCellIndex OPTIONAL,

measResultServingCell MeasResultNR,

measResultBestNeighCell MeasResultNR }

MeasResultListNR ::= SEQUENCE (SIZE (1..maxCellReport)) OF MeasResultNR

MeasResultNR ::= SEQUENCE {

physCellId PhysCellId OPTIONAL,

--FFS: Details of cgi info

cgi-Info TYPE_FFS!

measResult SEQUENCE {

cellResults SEQUENCE{

resultsSSBCell ResultsSSBCell OPTIONAL,

resultsCSI-RSCell ResultsCSI-RSCell OPTIONAL

}

rsIndexResults SEQUENCE{

resultsSSBIndexes ResultsPerSSBIndexList OPTIONAL,

resultsCSI-RSIndexes ResultsPerCSI-RSIndexList OPTIONAL

} OPTIONAL

}

ResultsSSBCell ::= SEQUENCE {

ssb-Cellrsrp RSRP-Range OPTIONAL,

ssb-Cellrsrq RSRQ-Range OPTIONAL,

ssb-Cellsinr SINR-Range OPTIONAL

}

ResultsCSI-RSCell ::= SEQUENCE {

csi-rs-Cellrsrp RSRP-Range OPTIONAL,

csi-rs-Cellrsrq RSRQ-Range OPTIONAL,

csi-rs-Cellsinr SINR-Range OPTIONAL

}

ResultsPerSSBIndexList ::= SEQUENCE (SIZE (1..maxNroSSBs)) OF ResultsPerSSBIndex

ResultsPerSSBIndex ::= SEQUENCE {

Ssb-Index SSB-Index,

ss-rsrp RSRP-Range OPTIONAL,

ss-rsrq RSRQ-Range OPTIONAL,

ss-sinr SINR-Range OPTIONAL

}

ResultsPerCSI-RSIndexList ::= SEQUENCE (SIZE (1..maxNroCSI-RS))

OF ResultsPerCSI-RSIndex

ResultsPerCSI-RSIndex ::= SEQUENCE {

csi-rsIndex CSI-RSIndex,

csi-rsrp RSRP-Range OPTIONAL,

csi-rsrq RSRQ-Range OPTIONAL,

csi-sinr SINR-Range OPTIONAL

}

Reference

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