LTE UE Attach過程中資訊互動

註：下表所列資訊互動，包含所有與eNB相關資訊（ue <->eNB<->EPC）

 

Msg Name	Entities	Comment
S1 SETUP REQUEST	eNB->NW	S1AP setup
S1 SETUP RESPONSE	NW -> eNB
MIB, SIB1, SIBX	eNB-> UEs	Broadcast Info
MSG1	UE->eNB	Preamble
MSG2	eNB->UE	With RA-RNTI
MSG3	UE->eNB	TM data (RRC Conn Request)
DL data	eNB-> UE	Copied from MSG3 48b
RRC Connection Setup	eNB->UE	TM data CCCH
RRC Connection Setup Complete	UE->eNB	AM data (include NAS Attach Request)
S1AP: NAS INITIAL UE MESSAGE	eNB->NW	Pass the NAS info to MME
S1AP: INITIAL CONTEXT SETUP REQUEST	NW->eNB	Include E-RAB, UE Radio Capability IE and etc. Attach Accept
RRC: UECapabilityEnquiry	eNB-> UE	AM: Enquiry RA capability for specific RAT (E-UTRA)
RRC: UECapabilityInformation	UE->eNB	AM: known by RAT only
S1: UE CAPABILITY INFO INDICATION	eNB->MME	Forward UE’s Capability Info
RRC:SecurityModeCommand	eNB->UE	Set securityConfigSMC
RRC: SecurityModeComplete	UE->eNB	To confirm the security setting
RRC: Connection Reconfiguration	eNB->UE	NAS pdu from initial context setup request to Establish DRB
RRC Connection Reconfiguration Complete	UE-> eNB	To confirm the Connection Reconfiguration
S1AP: Initial context setup response	eNB-> NW	E-RAB Setup & failed setup list
RRC: ULInformationTransfer	UE->eNB	NAS or non-3GPP info (Attach complete)
S1 AP: UL NAS TRANSPORT	eNB->MME	Forward UL Info Transfer