參考資料：3GPP 38.300、3GPP 38.331
SI：System Information
MIB：Master Information Block
SIB：SystemInformation Block
SSB：Synchronization Signal Block
RMSI：Remaining Minimum SI，剩余最小SI，即除MIB外的最小SI，
PSCell：Primary SCG Cell
BWP：Bandwidth Part
1. 系統訊息
SI包括一個MIB和多個SIB，SI分為最小SI 和其它SI，
（1）最小SI ：包括了初始接入和如何獲取其它SI的基本資訊，
- MIB：包含了如何獲取SIB1的資訊，以及其它，
★★ 攜帶的訊息：systemFrameNumber、subCarrierSpacingCommon、 ssb-SubcarrierOffset、dmrs-TypeA-Position、pdcch-ConfigSIB1、cellBarred 、 intraFreqReselection（是否允許同頻重選），
★★ MIB訊息在BCH上周期性重復廣播，周期為80ms，重復次數由SSB的周期決定，
- SIB1：包括了初始接入需要的資訊以及其它SI的調度資訊，
★★ 攜帶的訊息： cellSelectionInfo 、cellAccessRelatedInfo 、connEstFailureControl、si-SchedulingInfo、 servingCellConfigCommon、ims-EmergencySupport、eCallOverIMS-Support 、ue-TimersAndConstants 、uac-BarringInfo、useFullResumeID，
★★ SIB1也叫RMSI，剩余最小SI，即除MIB外的最小SI，
★★ SIB1在DL-SCH上周期性重復廣播，周期為160ms，在每個周期內重復廣播的次數是不固定的，其取決于具體實作，默認是8次，
★★ 當UE處于RRC_CONNECTED態時，可通過周期廣播，或者通過RRCReconfiguration訊息獲取SIB1，
★★ SIB1指示其它SI是周期性廣播，還是按需提供，若按需提供其它SI，則SIB1還需包括UE執行SI請求的資訊，
（2）其它SI：不包括在最小SI的其余所有系統訊息，
- 獲取其它SI的方式：
① 周期性廣播，其廣播資訊由SIB1中攜帶的si-SchedulingInfo決定；
② 按需廣播（ RRC_IDLE、RRC_INACTIVE），或者通過RRCReconfiguration發送給特定UE（ RRC_CONNECTED）； - SIB2：包括了小區重選公共資訊（同頻、異頻、RAT間），服務小區小區重選資訊、同頻小區重選資訊，
SIB2 ::= SEQUENCE {
cellReselectionInfoCommon SEQUENCE {
nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need R
absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need R
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 R
s-NonIntraSearchQ ReselectionThresholdQ OPTIONAL, -- Need R
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, -- Cond RSRQ
t-ReselectionNR T-Reselection,
frequencyBandList MultiFrequencyBandListNR-SIB OPTIONAL, -- Need S
frequencyBandListSUL MultiFrequencyBandListNR-SIB OPTIONAL, -- Need R
p-Max P-Max OPTIONAL, -- Need R
smtc SSB-MTC OPTIONAL, -- Need R
ss-RSSI-Measurement SS-RSSI-Measurement OPTIONAL, -- Need R
ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need R
deriveSSB-IndexFromCell BOOLEAN,
...,
[[
t-ReselectionNR-SF SpeedStateScaleFactors OPTIONAL -- Need N
]]
},
...
}
RangeToBestCell ::= Q-OffsetRange
- SIB3：包括了同頻鄰區資訊和同頻黑名單小區資訊，用于同頻小區重選，
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
- SIB4：包括了異頻小區重選資訊，異頻鄰區資訊，以及異頻黑名單小區資訊，用于異頻小區重選，
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 R
absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need R
smtc SSB-MTC OPTIONAL, -- Need R
ssbSubcarrierSpacing SubcarrierSpacing,
ssb-ToMeasure SSB-ToMeasure OPTIONAL, -- Need R
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 R
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
- SIB5：包括了E-UTRA小區重選資訊、E-UTRA小區資訊，E-UTRA黑名單小區資訊，用于RAT間小區重選，
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,
q-OffsetCell EUTRA-Q-OffsetRange,
q-RxLevMinOffsetCell INTEGER (1..8) OPTIONAL, -- Need R
q-QualMinOffsetCell INTEGER (1..8) OPTIONAL -- Need R
}
- SIB6：ETWS主通知，
- SIB7：ETWS輔通知
- SIB8：CMAS告警通知
- SIB9：GPS和UTC相關資訊，UE可根據SIB9獲取GPS、UTC以及本地時間，
2. UE獲取系統訊息
（1）UE何時需要獲取系統訊息？
- 小區選擇（剛開機）、小區重選、從未覆寫的區域到有覆寫的區域、從其它RAT進入到當前RAT、收到系統訊息變更的指示、收到PWS通知、存盤的SI已過期、after reconfiguration with sync completion，
（2）UE如何獲取系統訊息？
-
獲取MIB和SIB1：
★★ 當UE獲取MIB和SIB1訊息失敗時，則認為該小區禁止接入，
★★ 處于RRC_IDLE或 RRC_INACTIVE的UE，根據38.213協議所述，在BCCH信道上獲取MIB訊息；
★★ 處于RRC_IDLE、 RRC_INACTIVE，或已激活BWP，searchSpaceSIB1 和pagingSearchSpace配置了公共搜索空間且被指示系統訊息已變更RRC_CONNECTED的UE，根據MIB訊息，在DL-SCH信道上獲取SIB1， -
獲取其它SI：
（3）UE存盤系統訊息
3. 系統訊息的有效性
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