03_LTE Signaling and Procedure

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Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.

LTE Signaling & Procedure

Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved. Page2

Objectives

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

Describe the concepts of the LTE UE connections

Describe the procedure of random access

Describe the procedure of RRC setup

Describe the procedure of S1 signaling setup

Describe the procedure of E-RAB setup

Describe the structure of QoS in EPS

Describe the QoS mapping in EPS


Contents

1. Connection Management Overview

2. Random Access

3. Signaling Connection Management

4. Dedicated Radio Bearer Management

5. QoS in EPS


UE Connections

LTE UE connection includes :

Connection between the UE and eNodeB

Connection between the UE and MME

The connection management is performed in:

Control plane

User plane


Control Plane Connection


User Plane Connection


Classification of EPS Bearer

Page7

UE PDN-GWDefault EPS Bearer

Dedicated EPS Bearer (Maximum of 7) TFTTFT

Each Dedicated EPS Bearers has an associated TFT (Traffic Flow Template)


UE Connection Setup Procedure


Contents


2. Random Access



5. QoS in EPS


Purposes Random Access

Through the RA procedure, the UE can:

Obtain the uplink synchronization signals from the

network

Request dedicated resources for data transmission


Trigger of Random Access

UE initiates RA procedure in following scenarios :

initial RRC connection establishment

RRC connection reestablishment

Handover

UE is noticed downlink data arrival

UE detects Uplink data arrival


Contention-based and Non-Contention-based Random Access the RA procedure can be categorized into the

following types :

Contention-based RA

Handover

UE is noticed downlink data arrival

Contention-based RA

initial RRC connection establishment

RRC connection reestablishment

UE detects uplink data arrival


Contention-based Random Access Contention-based Random Access Procedure :


Random Access preamble

SequenceCP

TCP TSEQ Guard PeriodPreamble


Random Access preamble Format

Preamble Format Burst TCP TSEQ FDD Cell Radius (R) TDD Cell Radius (R)

0 1,000 µs 103.1 µs 800 µs R ≤ 14.5km 1.4 km < R ≤ 14.5 km

1 2,000 µs 684.4 µs 800 µs 29 km < R ≤ 77.3 km 29 km < R ≤ 77.3 km

2 2,000 µs 203.1 µs 1,600 µs 14 km < R ≤ 29.5 km 14 km < R ≤ 29.5 km

3 3,000 µs 684.4 µs 1,600 µs 77 km < R ≤ 100 km 77 km < R ≤ 100 km

4 167.9 µs 14.58 µs 133.33 µs Not involved. R ≤ 1.4 km


Preamble Sequence


Parameters of Random Access Preamble PreambleFmt

Parameter name: preamble format

Recommended value: 0

RootSequenceIdx

Parameter name: Root sequence index

Recommended value: None


Random Access Response

MAC RAR A

Sub Header A

MAC RAR B

MAC RAR n

RAPID Oct 1E T

Sub Header BSub Header n

TARUL GrantTA

UL GrantUL Grant

Temporary C-RNTITemporary C-RNTI

MAC RAR

RAPID or BI


Uplink Data Transmission


Contention Resolution


Non-Contention-based Random Access

Non-contention-based Random Access Procedure :


RA Backoff Control


Contents


2. Random Access

3. Signaling Connection Management Procedure

4. Dedicated Radio Bearer Management Procedure

5. QoS in EPS


Architecture of the Protocol Stack for Signaling Connection


RRC States

LTE Detached

LTE ActiveRRC Connected

LTE IdleRRC Idle

PLMN SelectionBroadcast of System Information

Cell Selection

RRC Connection (SRB)RRC Context in eNBUE Known in a Cell

Send and/or Receive Data to/from UENetwork Controlled Mobility

Measurement ControlUE Monitors Scheduling Control Channel

UE Reports Channel QualityUE can send Feedback Information

DRX can be Configured

DRX configured by NASBroadcast of System Information

PagingCell Reselection Mobility

GUTI AllocatedLocated in Tracking Area(s)

No RRC Context Stored in the eNB


RRC Connection Establishment

RRC Connection RequesteNBUE

RRC Connection Setup

RRC Connection Setup Complete

RRC Connection RequestUE IdentityCause

RRC Connection SetupRadio Resource Config Dedicated- srb-ToAddModList- drb-ToAddModList- drb-ToReleaseList- MAC Main Config- SPS Config- Physical Config Dedicated

RRC Connection Setup CompleteSelected PLMN-IdentityRegistered MMEDedicated Info NAS


RRC Connection Reestablishment

RRC Connection Reestablishment is applied in

following cases: Handover failure

RRC reconfiguration failure

Radio link failure

Integrity check failure

If security in the AS is not activated, a UE cannot

initiate RRC connection reestablishment.


RRC Connection Reestablishment Procedure


Dedicated S1 Connection and SRB2 Establishment


S1 Initial UE Message

Page32

Initial UE MessageeNB

Initial UE MessageeNB UE S1AP ID NAS-PDUTAIE-UTRAN CGIS-TMSI (O)CSG Identity (O)RRC Establishment causeGUMMEI (O)

MME


Downlink NAS TransporteNB MME

Uplink NAS Transport

Downlink and Uplink NAS Transport

Page33

Downlink NAS TransportMME UE S1AP ID eNB UE S1AP ID NAS-PDUHandover Restriction List (O)

Uplink NAS TransportMME UE S1AP ID eNB UE S1AP ID NAS-PDUE-UTRAN CGITAI


S1 Initial Context Setup Request

Page34

Initial Context Setup Request

eNB

Initial Context Setup RequestMME UE S1AP ID eNB UE S1AP ID UE Aggregate Maximum Bit RateE-RAB to Be Setup List - E-RAB ID- E-RAB Level QoS Parameters- Transport Layer Address- GTP-TEID- NAS-PDU (O)UE Security CapabilitiesSecurity KeyTrace Activation (O)Handover Restriction List (O)UE Radio Capability (O)Subscriber Profile ID for RAT/Frequency Priority (O)CS Fallback Indicator (O)SRVCC Operation Possible (O)

MME

Initial Context Setup Response


S1 Initial Context Setup Response

Page35

Initial Context Setup Request

eNB MME

Initial Context Setup Response

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)


Contents


2. Random Access



5. QoS in EPS


Initial Dedicated Radio Bearer Establishment


Dedicated Radio Bearer Establishment


S1 E-RAB Setup Request

Page39

E-RAB Setup RequestMME UE S1AP ID eNB UE S1AP ID UE Aggregate Maximum Bit Rate (O)E-RAB to Be Setup List - E-RAB ID- E-RAB Level QoS Parameters- Transport Layer Address- GTP-TEID- NAS-PDU

E-RAB Setup RequesteNB MME

E-RAB Setup Response


S1 E-RAB Setup Response

Page40

E-RAB Setup RequesteNB MME

E-RAB Setup Response

E-RAB 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)


Dedicated Radio Bearer Modification


Dedicated Radio Bearer Release


Contents


2. Random Access



5. QoS in EPS


QoS Structure in EPS

UE: User Equipment

S-GW：Serving Gateway

eNodeB: evolved NodeB

P-GW: Packet Data Network

Gateway

Page44

P-GW: Packet Data Network

Gateway

HSS: Home Subscriber Server

AF: Application Function


QoS Parameters - QCI

Page45

QCI Type Priority

Packet Delay Budget (ms)

Packet Error Rate

Example Service

1 GBR 2 100 10-2 Conversational Voice2 GBR 4 150 10-3 Conversational Video3 GBR 3 50 10-3 Real Time Gaming

4 GBR 5 300 10-6 Non-Conversational Voice

5 Non-GBR 1 100 10-6 IMS Signaling

6 Non-GBR 6 300 10-6 Video, TCP Based

7 Non-GBR 7 100 10-3 Voice, Video, Interactive Gaming




QoS Parameters – ARP

ARP (Allocation and Retention Priority), is used

define the priority of EPS resource allocation and

retention, defined in EPC

ARP only take effect during admission process, not

for scheduling. Once the bearer is setup, the ARP

doesn’t any effect of the current bearer.

Page46

ARP Value Service Priority

1~5 Gold

6~10 Silver

11~15 Copper


QoS Parameters – GBR/MBR

Page47

Actual server rate

GRB

Pass

MRB

Perform congestion control

Drop

Guaranteed Bit Rate

MBR: Maximum Bit Rate


QoS Parameters - AMBR

AMBR: Aggregate Maximum Bit Rate, is used for

Non-GBR services, can be shared by serval EPS

beaers

Page48

APN1

APN2

APN-AMBR

APN-AMBR

Internet

Intranet

UE-AMBR

UE-AMBR


Parameters in Each Elements

QoS Parameters

QCI ARP GBR MBR UE-AMBR

APN-AMBR

HSS Yes Yes No No Yes Yes

P-GW Yes Yes Yes Yes No Yes

eNodeB Yes Yes Yes Yes Yes No

UE Yes No Yes Yes No Yes

Page49


QoS Management

Page50

EPC

QoS Parameters delivery

QCIARPGBRMBRAMBR

QoS mapping RRM: Admission control Load control Scheduling

Radio QoS

QoS mapping (DSCP)TRM: Admission control Load control Flow control

Transport QoS

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03_LTE Signaling and Procedure

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