limited service mode emergency call support

Limited Service Mode Emergency CallSupport

USER DESCRIPTION

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Copyright

Ericsson AB 2011. 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 3

3 Parameters 53.1 Introduced Parameters 53.2 Affected Parameters 5

4 Network Impact 74.1 Capacity 74.2 Mobility 7

5 Associated Features and Affected Functions 95.1 Prerequisite Features 95.2 Affected Features 95.3 Related Features 95.4 Affected System Functions 9

6 Performance 116.1 KPIs 116.2 Counters 116.3 Events 11

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Limited Service Mode Emergency Call Support

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Introduction

1 Introduction

This document describes the Limited Service Mode Emergency Call Supportfeature and its main benefits and impacts in the LTE RAN

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

TDD: FAJ 221 1743, Limited Service Mode Emergency CallSupport

Replaces: N/A

This feature introduces the functionality to support handling of emergency callsin an LTE network for UE:s in limited service mode.This comprises

Broadcast in SIB1 of an indicator of the core network support of emergencycalls for UE:s in limited service mode, e.g. UE:s without a SIM card. Withthis indication UE:s will be allowed to set up emergency calls when inlimited service mode.

Support of the EIA0 (null) integrity protection algorithm expected to be(implicitly) signaled by the MME for UE:s in limited service mode

Support of mobility of emergency calls for UE:s in limited service mode

Dependencies

This feature has no prerequisite features.

This feature affects no other features.

1.2 BenefitsThe feature enables the UE user to setup and maintain emergency calls evenwhen out of home network coverage or without a SIM card inserted.

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Feature Operation

2 Feature Operation

This section describes the feature Limited Service Mode Emergency CallSupport in more detail, including network configuration requirements andoperation flows.

2.1 Network RequirementsThis feature has no prerequisite network configuration requirements

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Parameters

3 Parameters

This section describes parameters introduced by the Limited Service ModeEmergency Call Support feature and parameters affected by activating thefeature.

3.1 Introduced ParametersThis feature introduces no new parameters.

3.2 Affected ParametersThe implementation of this feature affects no parameters.

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Network Impact

4 Network Impact

This section describes how the Limited Service Mode Emergency Call Supportfeature impacts the network functions and capabilities.

4.1 CapacityThere is a minor negative impact on network capacity from the implementationof this feature due to the fact that UE:s normally served by other networks willbe allowed to make emergency call in this network.

4.2 MobilityThere is a minor impact on mobility from the implementation of this featuredue to the fact that UE:s in limited service mode will be granted access whentrying to do hand over into this network.

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Associated Features and Affected Functions

5 Associated Features and AffectedFunctions

This section describes how the Limited Service Mode Emergency Call Supportfeature affects other features and functions.

5.1 Prerequisite FeaturesThis feature has no prerequisite features.

5.2 Affected FeaturesThis feature affects no other feature

5.3 Related FeaturesThis feature can be seen as an add-on to the feature Admission Control, whichis part of LTE Basic.

5.4 Affected System FunctionsThis feature affects no system functions.

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Performance

6 Performance

This section describes performance indicators, counters, and events associatedwith the Limited Service Mode Emergency Call Support feature.

6.1 KPIsThis feature has no associated Key Performance Indicators (KPIs).

6.2 CountersThis feature has no directly associated RBS counters. There are howevercounters generated by OSS based on the events described below.

6.3 EventsTable 1 lists the important events associated with the Limited Service ModeEmergency Call Support feature.

Table 1 EventsEvent Event Parameter DescriptionINTERNAL_PROC_ERAB_SETUP

EVENT_ARRAY_ERAB_SETUP_ATT_ACC_TYPE

Array indicating the access type foreach requested ERAB. Position 0indicates access type for ERAB Id0 etc. Other ERAB Id are marked"unavailable"

INTERNAL_PROC_ERAB_SETUP

EVENT_ARRAY_ERAB_SETUP_SUCC_ACC_TYP

Array indicating successful setupfor the access type for each setup ERAB. Position 0 indicatesaccess type for ERAB Id 0 etc. Forunsuccssful setups, the ACC_TYPEmust be set to "unavailable"

INTERNAL_PROC_ERAB_SETUP

EVENT_PARAM_ACC_TYPE The access type that triggered theERAB setup

INTERNAL_PROC_INITIAL_CTXT_SETUP

EVENT_ARRAY_ERAB_SETUP_ATT_ACC_TYPE

Array indicating the access type foreach requested ERAB. Position 0indicates access type for ERAB Id0 etc. Other ERAB Id are marked"unavailable"


EVENT_ARRAY_ERAB_SETUP_SUCC_ACC_TYP

Array indicating successful setupfor the access type for each setup ERAB. Position 0 indicatesaccess type for ERAB Id 0 etc. Forunsuccssful setups, the ACC_TYPEmust be set to "unavailable"


EVENT_PARAM_ACC_TYPE The access type that triggered theERAB setup

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More information about events can be found in PM Event List.

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toc1 Introduction1.1 Basic CharacteristicsDependencies1.2 Benefits

2 Feature Operation2.1 Network Requirements

3 Parameters3.1 Introduced Parameters3.2 Affected Parameters

4 Network Impact4.1 Capacity4.2 Mobility

5 Associated Features and Affected Functions5.1 Prerequisite Features5.2 Affected Features5.3 Related Features5.4 Affected System Functions

6 Performance 6.1 KPIs6.2 Counters6.3 Events

limited service mode emergency call support

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