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SystemInformation ::= SEQUENCE {
criticalExtensions CHOICE {
systemInformation-r8 SystemInformation-r8-IEs,
criticalExtensionsFuture SEQUENCE {}
}
}

SystemInformation-r8-IEs ::= SEQUENCE {
sib-TypeAndInfo SEQUENCE (SIZE (1..maxSIB)) OF CHOICE {
sib2 SystemInformationBlockType2,
sib3 SystemInformationBlockType3,
sib4 SystemInformationBlockType4,
sib5 SystemInformationBlockType5,
sib6 SystemInformationBlockType6,
sib7 SystemInformationBlockType7,
sib8 SystemInformationBlockType8,
sib9 SystemInformationBlockType9,
sib10 SystemInformationBlockType10,
sib11 SystemInformationBlockType11,
...,
sib12-v920 SystemInformationBlockType12-r9,
sib13-v920 SystemInformationBlockType13-r9
},
nonCriticalExtension SystemInformation-v8a0-IEs OPTIONAL
}

根据协议来看，SI中并没有关于所包含的的每一个SIB的个数及长度的指示，你能说的再详细一点么