怎么看出RRC CONN REQ有多少bit？

illidan

-- ASN1START

RRCConnectionRequest ::=
SEQUENCE {

criticalExtensions
CHOICE {

rrcConnectionRequest-r8
RRCConnectionRequest-r8-IEs,

criticalExtensionsFuture
SEQUENCE {}

}
}

RRCConnectionRequest-r8-IEs ::=
SEQUENCE {

ue-Identity
InitialUE-Identity,

establishmentCause
EstablishmentCause,

spare
BIT STRING (SIZE (1))
}

InitialUE-Identity ::=
CHOICE {

s-TMSI
S-TMSI,

randomValue
BIT STRING (SIZE (40))
}

EstablishmentCause ::=
ENUMERATED {

emergency, highPriorityAccess, mt-Access, mo-Signalling,

mo-Data, spare3, spare2, spare1}

-- ASN1STOP


这个编码之后、换给PDCP的时候是多少bit? PDCP加密增加bit么？