LTE UE Attach过程中信息交互

注：下表所列信息交互，包含所有与eNB相关信息（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