microsoft powerpoint - oeo106020 lte eran6.0 connection management feature issue 1

LTE eRAN3.0 Connection Management

Feature

www.huawei.com

LTE eRAN6.0 Connection Management Feature

Objectives

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

� Describe the concepts of the LTE UE connections

� Outline the connection management procedures

� Outline the parameters for the connection management

Feature

Contents

1. Connection Management Overview

2. Random Access

3. Signaling Connection Management

4. Data Radio Bearer Management

UE Connections

� LTE UE connection includes :

� Connection between the UE and eNodeB

� Connection between the UE and EPC

� The connection management is performed in:

� Control plane

� User plane

Feature

Control Plane Connection

User Plane Connection

Feature

Classification of EPS Bearer

UE Connection Setup Procedure

Feature

Contents

2. Random Access

Purposes Random Access

� Through the RA procedure, the UE can:

� Obtain the uplink synchronization signals from the network

� Request dedicated resources for data transmission

Feature

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

� For positioning purpose

Contention-based and Non-Contention-

based Random Access

� the RA procedure can be categorized into the following

types :

� Non-Contention-based RA

� Handover

� UE is noticed downlink data arrival

� For positioning purpose

� Contention-based RA

� initial RRC connection establishment

� RRC connection reestablishment

� UE detects Uplink data arrival

Feature

Contention-based Random Access

� Contention-based Random Access Procedure :

Random Access preamble

Feature

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 29.5 km < R ≤ 77.3 km 29 .5km < R ≤ 77.3 km

2 2,000 µs 203.1 µs 1,600 µs 14 .5km < R ≤ 29.5 km 14.5 km < R ≤ 29.5 km

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

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

Related Parameters

� Command: MOD CELL

Parameter to set the preamble format

Parameter to set the cell radius

Feature

Preamble Sequence

Related Parameters

� Command: MOD CELL

Parameter to set the root sequence index

Feature

Random Access Response

Uplink Scheduled Data Transmission

Feature

Contention Resolution

RA Backoff Control

Feature

Non-Contention-based Random Access

� Non-contention-based Random Access Procedure :

Related Parameters

� Command: MOD CELLALGOSWITCH

Some parameters forrandom access

Feature

Contents

2. Random Access

Architecture of the Protocol Stack for

Signaling Connection

Feature

RRC States

RRC Connection Establishment

Feature

RRC Connection Establishment

Related Parameters

� Command: MOD RRCCONNSTATETIMER

Parameter to set timer 302

Feature

Dedicated S1 Connection Setup

Feature

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

Feature

S1 Initial UE Message

Downlink and Uplink NAS Transport

Feature

S1 Initial Context Setup Request

S1 Initial Context Setup Response

Feature

Signaling Link Release

� The signaling link release is initiated in the following

two scenarios:

� The MME initiates a UE Context Release Command message

� After detecting an exception, the eNodeB sends the MME a UE

Context Release Request message

� Signaling Link Release include:

� Release of the dedicated S1 connection

� Release of the RRC connection

Signaling Link Release Procedure

Feature

Related Parameters

� Command: MOD RRCCONNSTATETIMER

Parameter to set UE inactive timer

Contents

2. Random Access

Feature

Dedicated Radio Bearer Establishment

S1 E-RAB Setup Request

Feature

S1 E-RAB Setup Response

Dedicated Radio Bearer Modification

Feature

Dedicated Radio Bearer Release

Reference: Parameter description

� For detail, please refer to the notes.

Feature

Thank youwww.huawei.com

microsoft powerpoint - oeo106020 lte eran6.0 connection management feature issue 1

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