03_LTE Signaling and Procedure

LTE Signaling & Procedure

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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

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Page1

Contents 1. Connection Management Overview 2. Random Access 3. Signaling Connection Management 4. Dedicated Radio Bearer Management

5. QoS in EPS

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Page2

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

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Page3

Control Plane Connection

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Page4

User Plane Connection

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Page5

Classification of EPS Bearer

UE

TFT

Default EPS Bearer

PDN-GW

Dedicated EPS Bearer (Maximum of 7)

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

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Page6

TFT

UE Connection Setup Procedure

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Page7

Contents 1. Connection Management Overview 2. Random Access 3. Signaling Connection Management 4. Dedicated Radio Bearer Management

5. QoS in EPS

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Page8

Purposes Random Access 

Through the RA procedure, the UE can: 

Obtain the uplink synchronization signals from the network



Request dedicated resources for data transmission

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Page9

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

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Page10

Contention-based and NonContention-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

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Page11

Contention-based Random Access 

Contention-based Random Access Procedure :

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Page12

Random Access preamble

CP

Sequence

TCP

TSEQ

Guard Period

Preamble

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Page13

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

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Page14

Preamble Sequence

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Page15

Parameters of Random Access

Preamble 

PreambleFmt 

Parameter name: preamble format



Recommended value: 0



RootSequenceIdx



Parameter name: Root sequence index



Recommended value: None

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Page16

Random Access Response

E

T

RAPID

Sub Header A Sub Header B Sub Header n

RAPID or BI

MAC RAR A MAC RAR B MAC RAR n

Oct 1

M AC RAR R

TA TA

UL Grant UL Grant UL Grant Temporary C-RNTI Temporary C-RNTI

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Page17

Uplink Data Transmission

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Page18

Contention Resolution

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Page19

Non-Contention-based Random Access 

Non-contention-based Random Access Procedure :

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Page20

RA Backoff Control

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Page21

Contents 1. Connection Management Overview 2. Random Access 3. Signaling Connection Management Procedure 4. Dedicated Radio Bearer Management Procedure

5. QoS in EPS

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Page22

Architecture of the Protocol Stack for Signaling Connection

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Page23

RRC States PLMN Selection Broadcast of System Information Cell Selection

RRC Connection (SRB) RRC Context in eNB UE Known in a Cell Send and/or Receive Data to/from UE Network Controlled Mobility Measurement Control UE Monitors Scheduling Control Channel UE Reports Channel Quality UE can send Feedback Information DRX can be Configured

LTE Detached

LTE Active RRC Connected

LTE Idle RRC Idle

DRX configured by NAS Broadcast of System Information Paging Cell Reselection Mobility GUTI Allocated Located in Tracking Area(s) No RRC Context Stored in the eNB

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Page24

RRC Connection Establishment RRC Connection Request UE Identity Cause

UE

RRC Connection Request

eNB

RRC Connection Setup

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

RRC Connection Setup Complete

RRC Connection Setup Complete Selected PLMN-Identity Registered MME Dedicated Info NAS

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Page25

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.

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Page27

RRC Connection Reestablishment Procedure

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Page28

Dedicated S1 Connection and SRB2 Establishment

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Page29

S1 Initial UE Message Initial UE M essage eNB UE S1AP ID NAS-PDU TAI E-UTRAN CGI S-TMSI (O) CSG Identity (O) RRC Establishment cause GUMMEI (O) eNB

MME Initial UE Message

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Page31

Downlink and Uplink NAS Transport Downlink NAS Transport MME UE S1AP ID eNB UE S1AP ID NAS-PDU Handover Restriction List (O)

eNB

MME Downlink NAS Transport Uplink NAS Transport Uplink NAS Transport MME UE S1AP ID eNB UE S1AP ID NAS-PDU E-UTRAN CGI TAI

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Page32

S1 Initial Context Setup Request Initial Context Setup Request MME UE S1AP ID eNB UE S1AP ID UE Aggregate Maximum Bit Rate E-RAB to Be Setup List - E-RAB ID - E-RAB Level QoS Parameters - Transport Layer Address - GTP-TEID - NAS-PDU (O) UE Security Capabilities Security Key Trace 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) eNB

MME Initial Context Setup Request Initial Context Setup Response

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Page33

S1 Initial Context Setup Response

eNB

Initial Context Setup Response MME UE S1AP ID eNB UE S1AP ID E-RAB Setup List - E-RAB ID - Transport Layer Address - GTP-TEID E-RAB Failed to Setup List (O) Criticality Diagnostics (O)

MME

Initial Context Setup Request Initial Context Setup Response

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Page34

Contents 1. Connection Management Overview 2. Random Access 3. Signaling Connection Management 4. Dedicated Radio Bearer Management

5. QoS in EPS

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Page35

Initial Dedicated Radio Bearer Establishment

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Page36

Dedicated Radio Bearer Establishment

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Page37

S1 E-RAB Setup Request

eNB

E-RAB Setup Request MME 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 Request E-RAB Setup Response

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Page38

MME

S1 E-RAB Setup Response

eNB

MME E-RAB Setup Request E-RAB Setup Response

E-RAB Setup Response MME UE S1AP ID eNB UE S1AP ID E-RAB Setup List - E-RAB ID - Transport Layer Address - GTP-TEID E-RAB Failed to Setup List (O) Criticality Diagnostics (O)

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Page39

Dedicated Radio Bearer Modification

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Page40

Dedicated Radio Bearer Release

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Page41

Contents 1. Connection Management Overview 2. Random Access 3. Signaling Connection Management 4. Dedicated Radio Bearer Management

5. QoS in EPS

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Page42

QoS Structure in EPS



UE: User Equipment



S-GW：Serving Gateway



eNodeB: evolved NodeB





P-GW: Packet Data Network Gateway



HSS: Home Subscriber Server



AF: Application Function

P-GW: Packet Data Network Gateway

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Page43

QoS Parameters - QCI QCI

Type

Priority

Packet Delay Packet Budget (ms) Error Rate

1 2 3 4

GBR GBR GBR GBR

2 4 3 5

100 150 50 300

10-2 10-3 10-3 10-6

Conversational Voice Conversational Video Real Time Gaming 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

8

Non-GBR

8

300

10-6

Video, TCP Based

9

Non-GBR

9

300

10-6

Video, TCP Based

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Example Service

Page44

QoS Parameters – ARP



ARP Value

Service Priority

1~5

Gold

6~10

Silver

11~15

Copper

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

Page45

QoS Parameters – GBR/MBR Actual server rate

Drop MRB

Perform congestion control GRB

Pass



Guaranteed Bit Rate



MBR: Maximum Bit Rate

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Page46

QoS Parameters - AMBR Internet

APN1 UE-AMBR

APN-AMBR

APN2

Intranet

APN-AMBR UE-AMBR



AMBR: Aggregate Maximum Bit Rate, is used for Non-GBR services, can be shared by serval EPS beaers

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Page47

Parameters in Each Elements

QoS Parameters

QCI

ARP

GBR

MBR

UEAMBR

APNAMBR

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

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Page48

QoS Management QoS Parameters delivery

EPC Radio QoS Transport QoS

QoS mapping RRM: Admission control Load control Scheduling

QCI ARP GBR MBR AMBR

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

Page49

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