6.3.1 System information blocks

38.3313GPPNRProtocol specificationRadio Resource Control (RRC)Release 15TS

SIB2

SIB2 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection (i.e. applicable for more than one type of cell re-selection but not necessarily all) as well as intra-frequency cell re-selection information other than neighbouring cell related.

SIB2 information element

— ASN1START

— TAG-SIB2-START

SIB2 ::= SEQUENCE {

cellReselectionInfoCommon SEQUENCE {

nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, — Need S

absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, — Need S

rangeToBestCell RangeToBestCell OPTIONAL, — Need R

q-Hyst ENUMERATED {

dB0, dB1, dB2, dB3, dB4, dB5, dB6, dB8, dB10,

dB12, dB14, dB16, dB18, dB20, dB22, dB24},

speedStateReselectionPars SEQUENCE {

mobilityStateParameters MobilityStateParameters,

q-HystSF SEQUENCE {

sf-Medium ENUMERATED {dB-6, dB-4, dB-2, dB0},

sf-High ENUMERATED {dB-6, dB-4, dB-2, dB0}

}

} OPTIONAL, — Need R

},

cellReselectionServingFreqInfo SEQUENCE {

s-NonIntraSearchP ReselectionThreshold OPTIONAL, — Need S

s-NonIntraSearchQ ReselectionThresholdQ OPTIONAL, — Need S

threshServingLowP ReselectionThreshold,

threshServingLowQ ReselectionThresholdQ OPTIONAL, — Need R

cellReselectionPriority CellReselectionPriority,

cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, — Need R

},

intraFreqCellReselectionInfo SEQUENCE {

q-RxLevMin Q-RxLevMin,

q-RxLevMinSUL Q-RxLevMin OPTIONAL, — Need R

q-QualMin Q-QualMin OPTIONAL, — Need S

s-IntraSearchP ReselectionThreshold,

s-IntraSearchQ ReselectionThresholdQ OPTIONAL, — Need S

t-ReselectionNR T-Reselection,

frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, — Need S

frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, — Need R

p-Max P-Max OPTIONAL, — Need S

smtc SSB-MTC OPTIONAL, — Need S

ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, — Need R

ssb-ToMeasure SSB-ToMeasure OPTIONAL, — Need S

deriveSSB-IndexFromCell BOOLEAN,

…,

[[

t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL — Need N

]]

},

}

RangeToBestCell ::= Q-OffsetRange

— TAG-SIB2-STOP

— ASN1STOP

SIB2 field descriptions

absThreshSS-BlocksConsolidation

Threshold for consolidation of L1 measurements per RS index. If the field is absent, the UE uses the measurement quantity as specified in TS 38.304 [20].

cellReselectionInfoCommon

Cell re-selection information common for intra-frequency, inter-frequency and/ or inter-RAT cell re-selection.

cellReselectionServingFreqInfo

Information common for non-intra-frequency cell re-selection i.e. cell re-selection to inter-frequency and inter-RAT cells.

deriveSSB-IndexFromCell

This field indicates whether the UE can utilize serving cell timing to derive the index of SS block transmitted by neighbour cell. If this field is set to true, the UE assumes SFN and frame boundary alignment across cells on the serving frequency as specified in TS 38.133 [14].

frequencyBandList

Indicates the list of frequency bands for which the NR cell reselection parameters apply. The UE behaviour in case the field is absent is described in subclause 5.2.2.4.3.

intraFreqCellReselectionInfo

Cell re-selection information common for intra-frequency cells.

nrofSS-BlocksToAverage

Number of SS blocks to average for cell measurement derivation. If the field is absent the UE uses the measurement quantity as specified in TS 38.304 [20].

p-Max

Value in dBm applicable for the intra-frequency neighbouring NR cells. If absent the UE applies the maximum power according to TS 38.101-1 [15] in case of an FR1 cell or TS 38.101-2 [39] in case of an FR2 cell. In this release of the specification, if p-Max is present on a carrier frequency in FR2, the UE shall ignore the field and applies the maximum power according to TS 38.101-2 [39].

q-Hyst

Parameter "Qhyst" in TS 38.304 [20], Value in dB. Value dB1 corresponds to 1 dB, dB2 corresponds to 2 dB and so on.

q-HystSF

Parameter "Speed dependent ScalingFactor for Qhyst" in TS 38.304 [20]. The sf-Medium and sf-High concern the additional hysteresis to be applied, in Medium and High Mobility state respectively, to Qhyst as defined in TS 38.304 [20]. In dB. Value dB-6 corresponds to -6dB, dB-4 corresponds to -4dB and so on.

q-QualMin

Parameter "Qqualmin" in TS 38.304 [20], applicable for intra-frequency neighbour cells. If the field is absent, the UE applies the (default) value of negative infinity for Qqualmin.

q-RxLevMin

Parameter "Qrxlevmin" in TS 38.304 [20], applicable for intra-frequency neighbour cells.

q-RxLevMinSUL

Parameter "Qrxlevmin" in TS 38.304 [20], applicable for intra-frequency neighbour cells.

rangeToBestCell

Parameter "rangeToBestCell" in TS 38.304 [20]. The network configures only non-negative (in dB) values.

s-IntraSearchP

Parameter "SIntraSearchP" in TS 38.304 [20].

s-IntraSearchQ

Parameter "SIntraSearchQ" in TS 38.304 [20]. If the field is absent, the UE applies the (default) value of 0 dB for SIntraSearchQ.

s-NonIntraSearchP

Parameter "SnonIntraSearchP" in TS 38.304 [20]. If this field is absent, the UE applies the (default) value of infinity for SnonIntraSearchP.

s-NonIntraSearchQ

Parameter "SnonIntraSearchQ" in TS 38.304 [20]. If the field is absent, the UE applies the (default) value of 0 dB for SnonIntraSearchQ.

smtc

Measurement timing configuration for intra-frequency measurement. If this field is absent, the UE assumes that SSB periodicity is 5 ms for the intra-frequnecy cells.

ssb-ToMeasure

The set of SS blocks to be measured within the SMTC measurement duration (see TS 38.215 [9]). When the field is absent the UE measures on all SS-blocks.

t-ReselectionNR

Parameter "TreselectionNR" in TS 38.304 [20].

t-ReselectionNR-SF

Parameter "Speed dependent ScalingFactor for TreselectionNR" in TS 38.304 [20]. If the field is absent, the UE behaviour is specified in TS 38.304 [20].

threshServingLowP

Parameter "ThreshServing, LowP" in TS 38.304 [20].

threshServingLowQ

Parameter "ThreshServing, LowQ" in TS 38.304 [20].

SIB3

SIB3 contains neighbouring cell related information relevant only for intra-frequency cell re-selection. The IE includes cells with specific re-selection parameters as well as blacklisted cells.

SIB3 information element

— ASN1START

— TAG-SIB3-START

SIB3 ::= SEQUENCE {

intraFreqNeighCellList IntraFreqNeighCellList OPTIONAL, — Need R

intraFreqBlackCellList IntraFreqBlackCellList OPTIONAL, — Need R

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

IntraFreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellIntra)) OF IntraFreqNeighCellInfo

IntraFreqNeighCellInfo ::= SEQUENCE {

physCellId PhysCellId,

q-OffsetCell Q-OffsetRange,

q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, — Need R

q-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, — Need R

q-QualMinOffsetCell INTEGER (1..8) OPTIONAL, — Need R

}

IntraFreqBlackCellList ::= SEQUENCE (SIZE (1..maxCellBlack)) OF PCI-Range

— TAG-SIB3-STOP

— ASN1STOP

SIB3 field descriptions

intraFreqBlackCellList

List of blacklisted intra-frequency neighbouring cells.

intraFreqNeighCellList

List of intra-frequency neighbouring cells with specific cell re-selection parameters.

q-OffsetCell

Parameter "Qoffsets,n" in TS 38.304 [20].

q-QualMinOffsetCell

Parameter "Qqualminoffsetcell" in TS 38.304 [20]. Actual value Qqualminoffsetcell = field value [dB].

q-RxLevMinOffsetCell

Parameter "Qrxlevminoffsetcell" in TS 38.304 [20]. Actual value Qrxlevminoffsetcell = field value * 2 [dB].

q-RxLevMinOffsetCellSUL

Parameter "QrxlevminoffsetcellSUL" in TS 38.304 [20]. Actual value QrxlevminoffsetcellSUL = field value * 2 [dB].

SIB4

SIB4 contains information relevant only for inter-frequency cell re-selection i.e. information about other NR frequencies and inter-frequency neighbouring cells relevant for cell re-selection. The IE includes cell re-selection parameters common for a frequency as well as cell specific re-selection parameters.

SIB4 information element

— ASN1START

— TAG-SIB4-START

SIB4 ::= SEQUENCE {

interFreqCarrierFreqList InterFreqCarrierFreqList,

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

InterFreqCarrierFreqList ::= SEQUENCE (SIZE (1..maxFreq)) OF InterFreqCarrierFreqInfo

InterFreqCarrierFreqInfo ::= SEQUENCE {

dl-CarrierFreq ARFCN-ValueNR,

frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, — Cond Mandatory

frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, — Need R

nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, — Need S

absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, — Need S

smtc SSB-MTC OPTIONAL, — Need S

ssbSubcarrierSpacing SubcarrierSpacing,

ssb-ToMeasure SSB-ToMeasure OPTIONAL, — Need S

deriveSSB-IndexFromCell BOOLEAN,

ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL,

q-RxLevMin Q-RxLevMin,

q-RxLevMinSUL Q-RxLevMin OPTIONAL, — Need R

q-QualMin Q-QualMin OPTIONAL, — Need S

p-Max P-Max OPTIONAL, — Need S

t-ReselectionNR T-Reselection,

t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL, — Need S

threshX-HighP ReselectionThreshold,

threshX-LowP ReselectionThreshold,

threshX-Q SEQUENCE {

threshX-HighQ ReselectionThresholdQ,

threshX-LowQ ReselectionThresholdQ

} OPTIONAL, — Cond RSRQ

cellReselectionPriority CellReselectionPriority OPTIONAL, — Need R

cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, — Need R

q-OffsetFreq Q-OffsetRange DEFAULT dB0,

interFreqNeighCellList InterFreqNeighCellList OPTIONAL, — Need R

interFreqBlackCellList InterFreqBlackCellList OPTIONAL, — Need R

}

InterFreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellInter)) OF InterFreqNeighCellInfo

InterFreqNeighCellInfo ::= SEQUENCE {

physCellId PhysCellId,

q-OffsetCell Q-OffsetRange,

q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, — Need R

q-RxLevMinOffsetCellSUL INTEGER (1..8) OPTIONAL, — Need R

q-QualMinOffsetCell INTEGER (1..8) OPTIONAL, — Need R

}

InterFreqBlackCellList ::= SEQUENCE (SIZE (1..maxCellBlack)) OF PCI-Range

— TAG-SIB4-STOP

— ASN1STOP

SIB4 field descriptions

absThreshSS-BlocksConsolidation

Threshold for consolidation of L1 measurements per RS index. If the field is absent, the UE uses the measurement quantity as specified in TS 38.304 [20].

deriveSSB-IndexFromCell

This field indicates whether the UE may use the timing of any detected cell on that frequency to derive the SSB index of all neighbour cells on that frequency. If this field is set to true, the UE assumes SFN and frame boundary alignment across cells on the neighbor frequency as specified in TS 38.133 [14].

dl-CarrierFreq

This field indicates center frequency of the SS block of the neighbour cells, where the frequency corresponds to a GSCN value as specified in TS 38.101-1 [15].

frequencyBandList

Indicates the list of frequency bands for which the NR cell reselection parameters apply.

interFreqBlackCellList

List of blacklisted inter-frequency neighbouring cells.

interFreqCarrierFreqList

List of neighbouring carrier frequencies and frequency specific cell re-selection information.

interFreqNeighCellList

List of inter-frequency neighbouring cells with specific cell re-selection parameters.

nrofSS-BlocksToAverage

Number of SS blocks to average for cell measurement derivation. If the field is absent, the UE uses the measurement quantity as specified in TS 38.304 [20].

p-Max

Value in dBm applicable for the neighbouring NR cells on this carrier frequency. If absent the UE applies the maximum power according to TS 38.101-1 [15] in case of an FR1 cell or TS 38.101-2 [39] in case of an FR2 cell. In this release of the specification, if p-Max is present on a carrier frequency in FR2, the UE shall ignore the field and applies the maximum power according to TS 38.101-2 [39].

q-OffsetCell

Parameter "Qoffsets,n" in TS 38.304 [20].

q-OffsetFreq

Parameter "Qoffsetfrequency" in TS 38.304 [20].

q-QualMin

Parameter "Qqualmin" in TS 38.304 [20]. If the field is absent, the UE applies the (default) value of negative infinity for Qqualmin.

q-QualMinOffsetCell

Parameter "Qqualminoffsetcell" in TS 38.304 [20]. Actual value Qqualminoffsetcell = field value [dB].

q-RxLevMin

Parameter "Qrxlevmin" in TS 38.304 [20].

q-RxLevMinOffsetCell

Parameter "Qrxlevminoffsetcell" in TS 38.304 [20]. Actual value Qrxlevminoffsetcell = field value * 2 [dB].

q-RxLevMinOffsetCellSUL

Parameter "QrxlevminoffsetcellSUL" in TS 38.304 [20]. Actual value QrxlevminoffsetcellSUL = field value * 2 [dB].

q-RxLevMinSUL

Parameter "Qrxlevmin" in TS 38.304 [20].

smtc

Measurement timing configuration for inter-frequency measurement. If this field is absent, the UE assumes that SSB periodicity is 5 ms in this frequency.

ssb-ToMeasure

The set of SS blocks to be measured within the SMTC measurement duration (see TS 38.215 [9]). When the field is absent the UE measures on all SS-blocks.

ssbSubcarrierSpacing

Subcarrier spacing of SSB. Only the values 15 kHz or 30 kHz (FR1), and 120 kHz or 240 kHz (FR2) are applicable.

threshX-HighP

Parameter "ThreshX, HighP" in TS 38.304 [20].

threshX-HighQ

Parameter "ThreshX, HighQ" in TS 38.304 [20].

threshX-LowP

Parameter "ThreshX, LowP" in TS 38.304 [20].

threshX-LowQ

Parameter "ThreshX, LowQ" in TS 38.304 [20].

t-ReselectionNR

Parameter "TreselectionNR" in TS 38.304 [20].

t-ReselectionNR-SF

Parameter "Speed dependent ScalingFactor for TreselectionNR" in TS 38.304 [20]. If the field is absent, the UE behaviour is specified in TS 38.304 [20].

Conditional Presence

Explanation

Mandatory

The field is mandatory present in SIB4.

RSRQ

The field is mandatory present if threshServingLowQ is present in SIB2; otherwise it is absent.

SIB5

SIB5 contains information relevant only for inter-RAT cell re-selection i.e. information about E-UTRA frequencies and E-UTRAs neighbouring cells relevant for cell re-selection. The IE includes cell re-selection parameters common for a frequency.

SIB5 information element

— ASN1START

— TAG-SIB5-START

SIB5 ::= SEQUENCE {

carrierFreqListEUTRA CarrierFreqListEUTRA OPTIONAL, — Need R

t-ReselectionEUTRA T-Reselection,

t-ReselectionEUTRA-SF SpeedStateScaleFactors OPTIONAL, — Need S

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

CarrierFreqListEUTRA ::= SEQUENCE (SIZE (1..maxEUTRA-Carrier)) OF CarrierFreqEUTRA

CarrierFreqEUTRA ::= SEQUENCE {

carrierFreq ARFCN-ValueEUTRA,

eutra-multiBandInfoList EUTRA-MultiBandInfoList OPTIONAL, — Need R

eutra-FreqNeighCellList EUTRA-FreqNeighCellList OPTIONAL, — Need R

eutra-BlackCellList EUTRA-FreqBlackCellList OPTIONAL, — Need R

allowedMeasBandwidth EUTRA-AllowedMeasBandwidth,

presenceAntennaPort1 EUTRA-PresenceAntennaPort1,

cellReselectionPriority CellReselectionPriority OPTIONAL, — Need R

cellReselectionSubPriority CellReselectionSubPriority OPTIONAL, — Need R

threshX-High ReselectionThreshold,

threshX-Low ReselectionThreshold,

q-RxLevMin INTEGER (-70..-22),

q-QualMin INTEGER (-34..-3),

p-MaxEUTRA INTEGER (-30..33),

threshX-Q SEQUENCE {

threshX-HighQ ReselectionThresholdQ,

threshX-LowQ ReselectionThresholdQ

} OPTIONAL — Cond RSRQ

}

EUTRA-FreqBlackCellList ::= SEQUENCE (SIZE (1..maxEUTRA-CellBlack)) OF EUTRA-PhysCellIdRange

EUTRA-FreqNeighCellList ::= SEQUENCE (SIZE (1..maxCellEUTRA)) OF EUTRA-FreqNeighCellInfo

EUTRA-FreqNeighCellInfo ::= SEQUENCE {

physCellId EUTRA-PhysCellId,

dummy EUTRA-Q-OffsetRange,

q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, — Need R

q-QualMinOffsetCell INTEGER (1..8) OPTIONAL — Need R

}

— TAG-SIB5-STOP

— ASN1STOP

SIB5 field descriptions

carrierFreqListEUTRA

List of carrier frequencies of E-UTRA.

dummy

This field is not used in the specification. If received it shall be ignored by the UE.

eutra-BlackCellList

List of blacklisted E-UTRA neighbouring cells.

eutra-multiBandInfoList

Indicates the list of frequency bands in addition to the band represented by carrierFreq for which cell reselection parameters are common, and a list of additionalPmax and additionalSpectrumEmission values, as defined in TS 36.101 [22], table 6.2.4-1, for the frequency bands in eutra-multiBandInfoList

p-MaxEUTRA

The maximum allowed transmission power in dBm on the (uplink) carrier frequency, see TS 36.304 [27].

q-QualMin

Parameter "Qqualmin" in TS 36.304 [27]. Actual value Qqualmin = field value [dB].

q-QualMinOffsetCell

Parameter "Qqualminoffsetcell" in TS 36.304 [27]. Actual value Qqualminoffsetcell = field value [dB].

q-RxLevMin

Parameter "Qrxlevmin" in TS 36.304 [27]. Actual value Qrxlevmin = field value * 2 [dBm].

q-RxLevMinOffsetCell

Parameter "Qrxlevminoffsetcell" in TS 36.304 [27]. Actual value Qrxlevminoffsetcell = field value * 2 [dB].

t-ReselectionEUTRA

Parameter "TreselectionEUTRA" in TS 38.304 [20].

threshX-High

Parameter "ThreshX, HighP" in TS 38.304 [20].

threshX-HighQ

Parameter "ThreshX, HighQ" in TS 38.304 [20].

threshX-Low

Parameter "ThreshX, LowP" in TS 38.304 [20].

threshX-LowQ

Parameter "ThreshX, LowQ" in TS 38.304 [20].

t-ReselectionEUTRA-SF

Parameter "Speed dependent ScalingFactor for TreselectionEUTRA" in TS 38.304 [20]. If the field is absent, the UE behaviour is specified in TS 38.304 [20].

Conditional Presence

Explanation

RSRQ

The field is mandatory present if the threshServingLowQ is present in SIB2; otherwise it is absent.

– SIB6

SIB6 contains an ETWS primary notification.

SIB6 information element

— ASN1START

— TAG-SIB6-START

SIB6 ::= SEQUENCE {

messageIdentifier BIT STRING (SIZE (16)),

serialNumber BIT STRING (SIZE (16)),

warningType OCTET STRING (SIZE (2)),

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

— TAG-SIB6-STOP

— ASN1STOP

SIB6 field descriptions

messageIdentifier

Identifies the source and type of ETWS notification.

serialNumber

Identifies variations of an ETWS notification.

warningType

Identifies the warning type of the ETWS primary notification and provides information on emergency user alert and UE popup.

– SIB7

SIB7 contains an ETWS secondary notification.

SIB7 information element

— ASN1START

— TAG-SIB7-START

SIB7 ::= SEQUENCE {

messageIdentifier BIT STRING (SIZE (16)),

serialNumber BIT STRING (SIZE (16)),

warningMessageSegmentType ENUMERATED {notLastSegment, lastSegment},

warningMessageSegmentNumber INTEGER (0..63),

warningMessageSegment OCTET STRING,

dataCodingScheme OCTET STRING (SIZE (1)) OPTIONAL, — Cond Segment1

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

— TAG-SIB7-STOP

— ASN1STOP

SIB7 field descriptions

dataCodingScheme

Identifies the alphabet/coding and the language applied variations of an ETWS notification.

messageIdentifier

Identifies the source and type of ETWS notification.

serialNumber

Identifies variations of an ETWS notification.

warningMessageSegment

Carries a segment of the Warning Message Contents IE.

warningMessageSegmentNumber

Segment number of the ETWS warning message segment contained in the SIB. A segment number of zero corresponds to the first segment, A segment number of one corresponds to the second segment, and so on.

warningMessageSegmentType

Indicates whether the included ETWS warning message segment is the last segment or not.

Conditional Presence

Explanation

Segment1

The field is mandatory present in the first segment of SIB7, otherwise it is absent.

– SIB8

SIB8 contains a CMAS notification.

SIB8 information element

— ASN1START

— TAG-SIB8-START

SIB8 ::= SEQUENCE {

messageIdentifier BIT STRING (SIZE (16)),

serialNumber BIT STRING (SIZE (16)),

warningMessageSegmentType ENUMERATED {notLastSegment, lastSegment},

warningMessageSegmentNumber INTEGER (0..63),

warningMessageSegment OCTET STRING,

dataCodingScheme OCTET STRING (SIZE (1)) OPTIONAL, — Cond Segment1

warningAreaCoordinatesSegment OCTET STRING OPTIONAL, — Need R

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

— TAG-SIB8-STOP

— ASN1STOP

SIB8 field descriptions

dataCodingScheme

Identifies the alphabet/coding and the language applied variations of a CMAS notification.

messageIdentifier

Identifies the source and type of CMAS notification.

serialNumber

Identifies variations of a CMAS notification.

warningAreaCoordinatesSegment

If present, carries a segment, with one or more octets, of the geographical area where the CMAS warning message is valid as defined in [28]. The first octet of the first warningAreaCoordinatesSegment is equivalent to the first octet of Warning Area Coordinates IE defined in and encoded according to TS 23.041 [29] and so on.

warningMessageSegment

Carries a segment, with one or more octets, of the Warning Message Contents IE defined in TS 38.413 [42]. The first octet of the Warning Message Contents IE is equivalent to the first octet of the CB data IE defined in and encoded according to TS 23.041 [29], clause 9.4.2.2.5, and so on.

warningMessageSegmentNumber

Segment number of the CMAS warning message segment contained in the SIB. A segment number of zero corresponds to the first segment, one corresponds to the second segment, and so on. If warning area coordinates are provided for the warning message, then this field applies to both warning message segment and warning area coordinates segment.

warningMessageSegmentType

Indicates whether the included CMAS warning message segment is the last segment or not. If warning area coordinates are provided for the warning message, then this field applies to both warning message segment and warning area coordinates segment.

Conditional Presence

Explanation

Segment1

The field is mandatory present in the first segment of SIB8, otherwise it is absent.

SIB9

SIB9 contains information related to GPS time and Coordinated Universal Time (UTC). The UE may use the parameters provided in this system information block to obtain the UTC, the GPS and the local time.

NOTE: The UE may use the time information for numerous purposes, possibly involving upper layers e.g. to assist GPS initialisation, to synchronise the UE clock.

SIB9 information element

— ASN1START

— TAG-SIB9-START

SIB9 ::= SEQUENCE {

timeInfo SEQUENCE {

timeInfoUTC INTEGER (0..549755813887),

dayLightSavingTime BIT STRING (SIZE (2)) OPTIONAL, — Need R

leapSeconds INTEGER (-127..128) OPTIONAL, — Need R

localTimeOffset INTEGER (-63..64) OPTIONAL — Need R

} OPTIONAL, — Need R

lateNonCriticalExtension OCTET STRING OPTIONAL,

}

— TAG-SIB9-STOP

— ASN1STOP

SIB9 field descriptions

dayLightSavingTime

Indicates if and how daylight-saving time (DST) is applied to obtain the local time. The semantics are the same as the semantics of the Daylight Saving Time IE in TS 24.501 [23] and TS 24.008 [38]. The first/leftmost bit of the bit string contains the b2 of octet 3 and the second bit of the bit string contains b1 of octet 3 in the value part of the Daylight Saving Time IE in TS 24.008 [38].

leapSeconds

Number of leap seconds offset between GPS Time and UTC. UTC and GPS time are related i.e. GPS time -leapSeconds = UTC time.

localTimeOffset

Offset between UTC and local time in units of 15 minutes. Actual value = field value * 15 minutes. Local time of the day is calculated as UTC time + localTimeOffset.

timeInfoUTC

Coordinated Universal Time corresponding to the SFN boundary at or immediately after the ending boundary of the SI-window in which SIB9 is transmitted. The field counts the number of UTC seconds in 10 ms units since 00:00:00 on Gregorian calendar date 1 January, 1900 (midnight between Sunday, December 31, 1899 and Monday, January 1, 1900). See NOTE 1. This field is excluded when determining changes in system information, i.e. changes of timeInfoUTC should neither result in system information change notifications nor in a modification of valueTag in SIB1.

NOTE 1: The UE may use this field together with the leapSeconds field to obtain GPS time as follows: GPS Time (in seconds) = timeInfoUTC (in seconds) – 2,524,953,600 (seconds) + leapSeconds, where 2,524,953,600 is the number of seconds between 00:00:00 on Gregorian calendar date 1 January, 1900 and 00:00:00 on Gregorian calendar date 6 January, 1980 (start of GPS time).