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

Page 2


Contents

1.Overview

2.Elementary Procedures

3.Service signaling flow

Page 3


System Architecture Overview

Page 4


Bearer Service Architecture

Page 5


Bearer Level QoS

Page 6


Bearer Level QoS (Cont.)

Page 7


Application Protocol Identities

Page 8


UE States

Page 9


Signalling Radio Bearers

Page 10


System Information

Page 11


System Information Cont’d

Page 12


LTE Cell Search Procedure






UE Attach Procedure

RACH

RRC Setup

Authentication

E-RAB


Random Access Procedure

Page 17

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

size)

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

Page 19


RRC CONN SETUP

Page 20


RRC CONN SETUP CMP

Page 21


Initial Security Activation


RRCSecurity Mode Command

Security Mode Command

eNBUE

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

Page 25


Direct transfer message of S1interface


Direct transfer message of S1interface

In i t ia l U E

M e ssa g e

e N B

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

(O )

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

Page 28


UE capability report

UECapabilityInformation

UECapabilityEnquiry

UE EUTRAN


RRC Connection Reconfiguration

Page 30


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

Page 32


Context Management Procedures

Page 33


S1 Initial Context Setup Request


S1 Initial Context Setup Request


INITIAL UE CONTEXT SETUP RSP

S-GW

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

Copyright © 2010 Huawei TechnologiesCo., Ltd. All rights reserved. Page 37


SAE Bearer Management Procedures

Page 38


S1 Setup

Page 39


MME/eNodeB Configuration Update

Page 40


RRC Connection Release

Page 41


Mobility from E-UTRA

Page 42


DL/UL Information Transfer

Page 43


X2 Setup

Page 44


Paging (Core Side)

Page 45


Paging (eNB Side)

Page 46


Service Request Procedure

Page 47


Service Request Procedure

Page 48


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

Page50

MMEUE eNodeB Serving GW


End of Section

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Module 2-Lte Basic Signaling Procedure