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Maximum Cell Range USER DESCRIPTION 67/1553-HSC 105 50/1-V2 Uen D

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  • Maximum Cell Range

    USER DESCRIPTION

    67/1553-HSC 105 50/1-V2 Uen D

  • Copyright

    Ericsson AB 2011-2012. 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 1

    2 Feature Overview 32.1 Basic Characteristics 32.2 Dependencies 32.3 Benefits 32.4 Further Information 3

    3 Feature Operation 53.1 Network Configuration Requirements 53.2 Process Steps 5

    4 Parameters 74.1 Introduced Parameters 74.2 Affected Parameters 7

    5 Network Impact 95.1 Capacity 95.2 Coverage 9

    6 Associated Features and Affected Functions 116.1 Prerequisite Features 116.2 Affected Features 116.3 Related Features 116.4 Affected System Functions 11

    7 Performance 137.1 KPIs 137.2 Counters 137.3 Events 13

    8 O&M Information 15

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  • Maximum Cell Range

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  • Introduction

    1 Introduction

    This document describes the Maximum Cell Range feature.

    The information in this document reflects the feature at the time of its release.

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  • Maximum Cell Range

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  • Feature Overview

    2 Feature Overview

    This section describes the main benefits, dependencies, and impacts of theMaximum Cell Range feature in the LTE RAN.

    2.1 Basic CharacteristicsFeature identity:

    FAJ 221 0869, Maximum Cell Range

    Replaces: N/A

    2.2 DependenciesThis feature requires the following RAN features to be active:

    No prerequisite features are required.

    This feature may affect the following RAN features:

    No features are affected.

    2.3 BenefitsThe Maximum Cell Range feature provides support for a maximum cell rangeof 93 km. Without this feature the maximum cell range is 15 km. Large cellsare suitable to obtain coverage in sparsely populated areas where the needfor capacity is low. Examples of such areas are deserts, coastal areas, or seaenvironments. The feature makes it possible to set the cell range between 1and 93 km. The feature includes use of the random access preamble format 1that is appropriate for the large round trip times in cells with cell range largerthan 15 km.

    2.4 Further InformationMore information about this feature and related topics can be found in thefollowing documentation:

    3GPP TS 36.211, Physical Channels and Modulation

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  • Maximum Cell Range

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  • Feature Operation

    3 Feature Operation

    This section describes the Maximum Cell Range feature in more detail,including network configuration requirements and operation flows.

    3.1 Network Configuration RequirementsThe following network configuration prerequisites must be fulfilled at featureactivation:

    License for the Maximum Cell Range feature

    3.2 Process StepsThis section describes the main process steps for the feature flow.

    3.2.1 Cell Range Selection

    The user sets the cell range through the cellRange parameter as described inSection 4 on page 7.

    3.2.2 Random Access Preamble Format Selection

    The feature selects random access preamble format 0 for cell ranges up to 15km and format 1 for cell ranges larger than 15 km.

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  • Maximum Cell Range

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  • Parameters

    4 Parameters

    This section describes parameters introduced by the Maximum Cell Rangefeature and parameters affected by activating the feature.

    4.1 Introduced ParametersTable 1 describes the parameters introduced by the feature.

    Table 1 Introduced ParametersParameter Description

    featureStateMaximumCellRange

    Indicates whether the Maximum Cell Range licensed feature isACTIVATED or DEACTIVATED

    licenseStateMaximumCellRange

    Indicates whether the licensed state of the Maximum Cell Rangefeature is ENABLED or DISABLED.

    cellRange Defines the maximum distance from the RBS(1) where aconnection to a UE(2) can be setup or maintained or both

    (1) Radio Base Station(2) User Equipment

    4.2 Affected ParametersThe following parameters are affected by this feature:

    Table 2 Affected ParametersParameter Description

    subframeAssignment For cellRange greater than 15 subframeAssignment mustbe set to 1.

    specialSubframePattern specialSubframePattern = 5 can not be used in combinationwith nB=T4 on MO Paging, see 3GPP TS 36.213. The round triptime at the cellRange together with switching time must be lessthan the time available in special subframe.

    For cellRange values larger than 15, subframeAssignment must be setto 1. There are also limitations to the allowed configuration of cell range,cellRange, depending on the specialSubframePattern.

    Note: There is a trade-off between DL throughput and cell range:

    specialSubframePattern 7 limits the allowed cell range to 18 km.

    Using specialSubframePattern 7 provides the best DL throughput.cellRange values larger than 18 will be rejected.

    specialSubframePattern 6 limits the allowed cell range to 29 km.

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  • Maximum Cell Range

    Using specialSubframePattern 6 provides a slightly reduced DL throughput.cellRange values larger than 29 will be rejected.

    specialSubframePattern 5 allows cell ranges up to the maximum of 93 km.

    Cell ranges greater than 29 km requires use of specialSubframePattern 5,but this significantly reduces DL throughput.

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  • Network Impact

    5 Network Impact

    This section describes how the Maximum Cell Range feature impacts thenetwork functions and capabilities.

    5.1 CapacityIf the Maximum Cell Range feature is activated and if the cell range exceeds 15km, extra Uplink (UL) resource blocks must be reserved for random access,which reduces UL capacity.

    5.2 CoverageThis feature provides the LTE RAN with the functional possibility to carry trafficin cells with the maximum cell range defined by 3GPP, 93 km, provided theradio conditions are adequate.

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  • Maximum Cell Range

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  • Associated Features and Affected Functions

    6 Associated Features and AffectedFunctions

    This section describes how the Maximum Cell Range feature affects otherfeatures and functions.

    6.1 Prerequisite FeaturesThere are no prerequisite features for this feature.

    6.2 Affected FeaturesNo other features are affected by this feature.

    6.3 Related FeaturesThere are no other features related to this feature.

    6.4 Affected System FunctionsThe following functions are affected by the feature:

    UL capacity If the feature is activated and if the cell range exceeds15 km, extra UL resource blocks must be reservedfor random access, which reduces UL capacity asdescribed in Coverage and Capacity Dimensioning.

    DL throughput There is a trade-off between DL throughput and cellrange. Larger cell ranges reduces DL throughput.

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  • Maximum Cell Range

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  • Performance

    7 Performance

    This section describes performance indicators, counters, and events associatedwith the Maximum Cell Range feature.

    7.1 KPIsThe main Key Performance Indicators (KPIs) associated with this feature arelisted in Table 3.

    Table 3 KPIs

    Uplink Throughput Speed at which packets can betransferred in UL once the firstpacket has been scheduled on the airinterface

    7.2 CountersThere are no counters associated with this feature.

    7.3 EventsThere are no events associated with this feature.

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  • Maximum Cell Range

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  • O&M Information

    8 O&M Information

    This section provides Operation and Maintenance (O&M) information for theMaximum Cell Range feature.

    Activating the Maximum Cell Range feature requires that the correspondinglicense is installed. More information on handling licenses can be found inLicense Management.

    The Maximum Cell Range feature is activated by setting thefeatureStateMaximumCellRange parameter to ACTIVATED.

    The cell range is specified by setting the cellRange parameter.

    The operation state of the Maximum Cell Range feature can be verified usingthe serviceStateMaximumCellRange parameter.

    For cellRange values larger than 15, subframeAssignment must be setto 1. There are also limitations to the allowed configuration of cell range,cellRange, depending on the specialSubframePattern.

    Note: There is a trade-off between DL throughput and cell range, moreinformation can be found in Section 4.2 on page 7.

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    toc1 Introduction2 Feature Overview2.1 Basic Characteristics2.2 Dependencies2.3 Benefits2.4 Further Information

    3 Feature Operation3.1 Network Configuration Requirements3.2 Process Steps3.2.1 Cell Range Selection3.2.2 Random Access Preamble Format Selection

    4 Parameters4.1 Introduced Parameters4.2 Affected Parameters

    5 Network Impact5.1 Capacity5.2 Coverage

    6 Associated Features and Affected Functions6.1 Prerequisite Features6.2 Affected Features6.3 Related Features6.4 Affected System Functions

    7 Performance 7.1 KPIs7.2 Counters7.3 Events

    8 O&M Information