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USER DESCRIPTION

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Copyright

Ericsson AB 2012. All rights reserved. No part of this document may bereproduced in any form without the written permission of the copyright owner.

Disclaimer

The contents of this document are subject to revision without notice due tocontinued progress in methodology, design and manufacturing. Ericsson shallhave no liability for any error or damage of any kind resulting from the useof this document.

Trademark List

All trademarks mentioned herein are the property of their respective owners.These are shown in the document Trademark Information.

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Contents

Contents

1 Introduction 11.1 Basic Characteristics 11.2 Benefits 1

2 Feature Operation 32.1 Network Requirements 42.2 Feature Operation Sequence Diagram 42.3 Process Steps 5

3 Parameters 93.1 Introduced Parameters 93.2 Affected Parameters 9

4 Network Impact 114.1 Capacity 114.2 Mobility 11

5 Associated Features and Affected Functions 135.1 Prerequisite Features 135.2 Affected Features 135.3 Related Features 135.4 Affected System Functions 13

6 Performance 156.1 KPIs 156.2 Counters 156.3 Events 15

7 O&M Information 177.1 Performance Index 177.2 Reduce the Handover Oscillation Rate 177.3 Decrease the Handover Margin for Intra-frequency

Handovers 187.4 Inter-frequency Handovers 19

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UE Level Oscillating Handover Minimization

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Introduction

1 Introduction

This document describes the User Equipment (UE) Level Oscillating HandoverMinimization feature and its main benefits and impacts in the LTE RAN.

1.1 Basic CharacteristicsThis section describes the basic characteristics of the feature.

Feature Identity:FAJ 221 1885, UE Level Oscillating HandoverMinimization

Replaces:

Dependencies

This feature requires one or both of the following RAN features to be active:

Intra-LTE Handover

Coverage-Triggered Inter-Frequency Handover

This feature affects no other features.

1.2 BenefitsThis section describes the benefits of this feature.

In a radio network with a high rate of unnecessary Handover, this featuremay decrease the number of unnecessary handover, and thus decrease thesignaling load and potentially increase throughput.

In a radio network where the Handover Margin (HOM) is configured to a highvalue, this feature makes it possible to decrease the configured HOM withoutincreasing the number of handovers. This will cause the UE to make handoverto the best cell earlier for better performance.

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UE Level Oscillating Handover Minimization

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Feature Operation

2 Feature Operation

This section describes the UE Level Oscillating Handover Minimization featurein more detail, including network configuration requirements and operationflows.

The purpose of this feature is to reduce the number of unnecessary handoversperformed by UE, by preventing fast handovers and repeated handovers tothe same cell as specified in Table 1.

Table 1 Handover Oscillation Prevention Rules

TC(1) TL(2)Timein LastCell

Action

TC < T1(3) - Reject handover.T1 TC