5G(NR)學習(6)--SIB4~9消息

在5G(NR)無線網絡(RAN)中SIB4~9都屬於OSI消息；它們分別包含異頻(系統)網絡的鄰區信息、ETWS、CMAS及GPS/UTC時鍾信息；SIB4、5、9消息根據終耑的需要進行廣播，而SIB6、7、8消息則是根據事件需要進行廣播；它們具躰分別如下:

1.SIB4中包含與異頻小區重選相關的信息(即與小區重選相關的其他NR頻率和異頻相鄰小區的信息)，也可以用於NR空閑/非活動測量。

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,

 frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL,

 nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL,

 absThreshSS-BlocksConsolidationThresholdNR OPTIONAL,

 smtc SSB-MTC OPTIONAL,

 ssbSubcarrierSpacing SubcarrierSpacing,

 ssb-ToMeasure SSB-ToMeasure OPTIONAL,

 deriveSSB-IndexFromCell BOOLEAN,

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

 q-RxLevMin Q-RxLevMin,

 q-RxLevMinSUL Q-RxLevMin OPTIONAL,

 q-QualMin Q-QualMin OPTIONAL,,

 p-Max P-Max OPTIONAL,

 t-ReselectionNR T-Reselection,

 t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL,

threshX-HighPReselectionThreshold,

threshX-LowPReselectionThreshold,

 threshX-Q SEQUENCE {

threshX-HighQReselectionThresholdQ,

threshX-LowQReselectionThresholdQ

 } OPTIONAL,

 cellReselectionPriority CellReselectionPriority OPTIONAL,

 cellReselectionSubPriority CellReselectionSubPriority OPTIONAL,

 q-OffsetFreq Q-OffsetRange DEFAULT dB0,

 interFreqNeighCellList InterFreqNeighCellList OPTIONAL,--Need R

 interFreqBlackCellList InterFreqBlackCellList OPTIONAL,--Need R

InterFreqBlackCellList:= PCI範圍的序列(1..maxCellBlack）---黑名單(PCI段）

2.SIB5包含僅與RAT間小區重選相關的信息，即關於與小區重選相關的E-UTRA頻率和E-UTRA相鄰小區的信息。--支持終耑從5G到4G/3G重選。

SIB5 ::= SEQUENCE {

 carrierFreqListEUTRA CarrierFreqListEUTRA OPTIONAL,

 t-ReselectionEUTRA T-Reselection,

 t-ReselectionEUTRA-SF SpeedStateScaleFactors OPTIONAL,

 lateNonCriticalExtension OCTET STRING OPTIONAL,...

3.SIB6:包含ETWS主要通知

SIB6 ::= SEQUENCE { 
messageIdentifier
 BIT STRING (SIZE (16)), 
serialNumber
 BIT STRING (SIZE (16)), 
warningType
 OCTET STRING (SIZE (2)), 
 lateNonCriticalExtension OCTET STRING OPTIONAL,... 

4.SIB7:包含ETWS二次通知

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,--CondSegment1
 lateNonCriticalExtension OCTET STRING OPTIONAL,... 

5.SIB8:包含CMAS通知

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,

 warningAreaCoordinatesSegment OCTET STRING OPTIONAL,

 lateNonCriticalExtension OCTET STRING OPTIONAL,...

6.SIB9:攜帶GPS時間和UTC(協調世界時）

SIB9 ::= SEQUENCE {

 timeInfo SEQUENCE {

 timeInfoUTC INTEGER (0..549755813887),

 dayLightSavingTime BIT STRING (SIZE (2)) OPTIONAL,

 leapSeconds INTEGER (-127..128) OPTIONAL,

 localTimeOffset INTEGER (-63..64) OPTIONAL

 } OPTIONAL,--Need R

 lateNonCriticalExtension OCTET STRING OPTIONAL,...