module 2-lte basic signaling procedure

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LTE System Signaling Procedure

Ray Khastur

Objectives

Upon completion of this course, you will be able to ：

Know the LTE/SAE system architecture and functions

Know main elementary procedures of S1/X2/Uu interfaces

Know the procedure of service setup, service release, intra-eUTRAN

handover

Contents

1.Overview

2.Elementary Procedures

3.Service signaling flow

System Architecture Overview

Bearer Service Architecture

Bearer Level QoS

Bearer Level QoS (Cont.)

Application Protocol Identities

UE States

Signalling Radio Bearers

System Information

System Information Cont’d

LTE Cell Search Procedure

UE Attach Procedure

RRC Setup

Authentication

Random Access Procedure

Typical 'Contention Based' RACH Procedure is as follows :

i) UE --> NW : RACH Preamble (RA-RNTI, indication for L2/L3 message size)ii) UE <-- NW : Random Access Response (Timing Advance, T_C-RNTI, UL grant for L2/L3 message)iii) UE --> NW : L2/L3 messageiv) Message for early contention resolution

Typical 'Contention Free' RACH Procedure is as follows :

i) UE <--NW : RACH Preamble (PRACH) Assignment

ii) UE --> NW : RACH Preamble (RA-RNTI, indication for L2/L3 message

iii) UE <--NW : Random Access Response (Timing Advance, C-RNTI, UL

grant for L2/L3 message)

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RRC Connection Establishment

RRC CONN SETUP REQ

RRC CONN SETUP

RRC CONN SETUP CMP

Initial Security Activation

RRCSecurity Mode Command

Security Mode Command

Security Mode Complete

Security Mode CommandCiphering Algorithm

Integrity Protection Algorithm

Security Mode Failure

Direct transfer (Authentication & ciphering)Uu interface trace

S1 interface trace

NAS Transport

Direct transfer message of S1interface

In i t ia l U E

M e ssa g e

I n i t i a l U E

M e s s a g e e N B U E

S1 A P ID N A S- P D U

T A IE- U T R A N

C G I S- T M SI

C SG Id e n t i t y (O )R R C Es t a b l ish m e n t

c a u se G U M M EI (O ) M M E

UE Capability Transfer

UE capability report

UECapabilityInformation

UECapabilityEnquiry

UE EUTRAN

RRC Connection Reconfiguration

RRC connection reconfiguration

RRC C onnection Recon f igura tion

RRC C onnection Recon f igura tionC omple te

U E E U T R A N

Used to establish SRB2 and default DRB1.

Handover Preparation

Context Management Procedures

S1 Initial Context Setup Request

INITIAL UE CONTEXT SETUP RSP

Initial Context Setup Request

eNB MME

Initial Context Setup ResponseModify Bearer

Initial Context Setup ResponseMME UE S1AP ID

eNB UE S1AP ID

E-RAB Setup List

- E-RAB ID

- Transport Layer Address

- GTP-TEIDE-RAB Failed to Setup List (O)

Criticality Diagnostics (O)

S-GW Address

and TEID

eNB Address and

TEIDE-RAB ID = 5

INITIAL UE CONTEXT SETUP RSP

SAE Bearer Management Procedures

S1 Setup

MME/eNodeB Configuration Update

RRC Connection Release

Mobility from E-UTRA

DL/UL Information Transfer

X2 Setup

Paging (Core Side)

Paging (eNB Side)

Service Request Procedure

Service request procedureUu interface trace

S1 interface trace

S1 release procedure

1. S1-AP: S1 UE Context Release Request

2. Update Bearer Request

3. Update Bearer Response

4. S1-AP: S1 UE Context Release Command

5. RRC Connection Release

6. S1-AP: S1 UE Context Release Complete

Purpose:

□ To release the logical S1-AP signalling connection (over S1-MME) and all S1

bearers (in S1-U) for a UE. The procedure will move the UEfrom ECM-

CONNECTED to ECM-IDLEin both the UEand MME, and all UErelated context

information is deleted in the eNodeB

MMEUE eNodeB Serving GW

End of Section

module 2-lte basic signaling procedure

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