在5G(NR)網(wǎng)絡(luò)提出后，3GPP針對終端在空閑態(tài)下4G->5G的重選制定了特定的系統(tǒng)消息SIB24；其在4G(LTE)網(wǎng)絡(luò)中進行廣播，以供終端從4G重選到5G，而SIB24消息中的主要內(nèi)容如下：

SIB 24( InterRAT/NR Neighbouring cells for cell reselection).

SystemInformationBlockType24-r15 ::= SEQUENCE {

carrierFreqListNR-r15                              CarrierFreqListNR-r15 OPTIONAL, -- Need----NR載頻列表

t-ReselectionNR-r15                               T-Reselection,                                         ----NR重選指示

t-ReselectionNR-SF-r15                          SpeedStateScaleFactors OPTIONAL, -- Need OR ----NR重選速度因子

lateNonCriticalExtension                          OCTET STRING OPTIONAL,...}

CarrierFreqListNR-r15                                     ::= SEQUENCE (SIZE (1..maxFreq)) OF CarrierFreqNR-r15

CarrierFreqNR-r15 ::= SEQUENCE {

carrierFreq-r15                                     ARFCN-ValueNR-r15,                           ----NR載頻點列表

multiBandInfoList-r15                             MultiFrequencyBandListNR-r15 OPTIONAL, -- Need OR

multiBandInfoListSUL-r15                        MultiFrequencyBandListNR-r15 OPTIONAL, -- Need OR

measTimingConfig-r15                            MTC-SSB-NR-r15 OPTIONAL, -- Need OR ----NR小區(qū)(SSB MTC) subcarrierSpacingSSB-r15                      ENUMERATED {kHz15, kHz30, kHz120, kHz240},----NR子載波間隔

ss-RSSI-Measurement-r15                     SS-RSSI-Measurement-r15 OPTIONAL, -- Cond RSRQ2---NR RSSI測量 

cellReselectionPriority-r15                      CellReselectionPriority OPTIONAL, -- Need OP

cellReselectionSubPriority-r15                 CellReselectionSubPriority-r13 OPTIONAL, -- Need OR

threshX-High-r15                                  ReselectionThreshold,       ---NR  重選的X-High

threshX-Low-r15                                  ReselectionThreshold,         ---NR 重選的X-LOW

threshX-Q-r15 SEQUENCE {

threshX-HighQ-r15                       ReselectionThresholdQ-r9,

threshX-LowQ-r15                       ReselectionThresholdQ-r9

} OPTIONAL, -- Cond RSRQ

q-RxLevMin-r15                                   INTEGER (-70..-22),               ---NR 重選主小區(qū)最小接入電平 

q-RxLevMinSUL-r15                              INTEGER (-70..-22) OPTIONAL, -- Need OR  ---NR 重選SUL小區(qū)最小接入電平 

p-MaxNR-r15                                       P-MaxNR-r15,                             ---NR小最大發(fā)射功率

ns-PmaxListNR-r15                               NS-PmaxListNR-r15 OPTIONAL, -- Need OR

q-QualMin-r15                                     INTEGER (-43..-12) OPTIONAL, -- Need OP

deriveSSB-IndexFromCell-r15                 BOOLEAN,

maxRS-IndexCellQual-r15                      MaxRS-IndexCellQualNR-r15 OPTIONAL, -- Need OR

threshRS-Index-r15                             ThresholdListNR-r15 OPTIONAL, -- Need OR

...,

[[ multiBandNsPmaxListNR-v1550            MultiBandNsPmaxListNR-1-v1550 OPTIONAL, -- Need OR

multiBandNsPmaxListNR-SUL-v1550         MultiBandNsPmaxListNR-v1550 OPTIONAL, -- Need OR

ssb-ToMeasure-r15                              SSB-ToMeasure-r15 OPTIONAL -- Need OR

]]}

MultiBandNsPmaxListNR-1-v1550    ::= SEQUENCE (SIZE (1.. maxMultiBandsNR-1-r15)) OF NS-PmaxListNR-r15

MultiBandNsPmaxListNR-v1550       ::= SEQUENCE (SIZE (1.. maxMultiBandsNR-r15)) OF NS-PmaxListNR-r15

原文來自：www.sharetechnote.com
整理：kangguoying20201206
"4G(LTE）小區(qū)能支持多少VOLTE用戶？"將在微信公眾號"跟著老康學(xué)5G"中推出，敬請關(guān)注。