Cross-Sector Antenna Sharing Redundancy.pdf

Cross-Sector Antenna Sharing Redundancy

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 1

1.1 Basic Characteristics 1

1.2 Benefits 1

2 Feature Operation 3

2.1 Feature Implementations 3

2.2 Network Requirements 5

3 Parameters 7

3.1 Introduced Parameters 7

3.2 Affected Parameters 7

4 Network Impact 9

5 Associated Features and Affected Functions 11

5.1 Prerequisite Features 11

5.2 Affected Features 11

5.3 Related Features 11

5.4 Affected System Functions 11

6 Performance 13

6.1 KPIs 13

6.2 Counters 13

6.3 Events 13

7 O&M Information 15

7.1 Basic Configuration 15

7.2 Configuration with RET via the RET-port 15

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Introduction

1 Introduction

This document describes the Cross-Sector Antenna Sharing Redundancyfeature.

1.1 Basic Characteristics

This section describes the basic characteristics of the feature.

Feature Identity

TDD: FAJ 221 0994, Cross-Sector Antenna SharingRedundancy

Replaces: N/A

Dependencies

This feature requires the following RAN features to be active:

Dual-Antenna Downlink Performance Package

This feature affects no other features.

1.2 Benefits

This section describes the benefits of this feature.

The Cross-Sector Antenna Sharing Redundancy feature introduces redundancyin configurations with dual Transmitter (TX) Remote Radio Units (RRUs) usedin a multi-sector site. Cross-connections of the antenna feeders between theRRUs and the antennas prevent a single point of failure, for example a faultyRRU, from causing the entire sector to be lost. During a hardware fault theeNode-B (also known as eNB) will run in degraded mode, with one TX/Receiver(RX) branch. This makes it possible to plan and schedule a site visit in asuitable time of the particular site.

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Feature Operation

2 Feature Operation

This section describes the Cross-Sector Antenna Sharing Redundancy featurein more detail, including network configuration requirements and operationflows.

The redundancy of the feature is achieved by cross-connecting the antennafeeders between the RRUs and the antennas. One antenna unit is served bytwo RRUs and one RRU serves two antennas units as shown in Figure 1.

L0000443A

Sector 1 Sector 2 Sector 3

Figure 1 Principle for Cross-Sector Antenna Sharing Redundancy

With this configuration, two sectors will be affected by one faulty RRU, losingone antenna feeder connection each. Losing one of these connections causesdegraded performance, but there will still be coverage.

While the fault is identified and sectors and cells are being reconfigured, therewill be a downtime for the node. More information can be found in FaultManagement.

2.1 Feature Implementations

This section describes different ways of implementing the feature.

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2.1.1 Implementations with RET

Remote Electrical Tilt (RET) can be used together with the Cross-SectorAntenna Sharing Redundancy feature in either of the following ways:

RET with RET Interface Unit (RIU)

See Section 2.1.1.1 on page 4.

RET through RET port

See Section 2.1.1.2 on page 4.

2.1.1.1 Cross-Sector Antenna Sharing Redundancy with RET and RIU

RET can be used together with RIU when communication and power is suppliedto the RET through the feederas shown in Figure 2.

L0000446A

RF ports

Figure 2 Feature Implementation Using RET and RIU

2.1.1.2 Cross-Sector Antenna Sharing Redundancy with RET through the RETPort

The RET can be directly connected to the RET port on the RRUs as shownin Figure 3.

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Feature Operation

L0000447A

RET port RET port

Figure 3 Feature Implementation Using RET and RET Port

2.2 Network Requirements

The following must be fulfilled at feature activation:

This antenna feeder cross-connection is only useful if dual TX RRUs arebeing used.

All sectors included in the antenna feeder cross-connection must have thesame output power.

All cells must have the same bandwidth.

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Parameters

3 Parameters

This section describes parameters introduced by the Cross-Sector AntennaSharing Redundancy feature and parameters affected by activating the feature.

3.1 Introduced Parameters

This feature introduces no new parameters.

3.2 Affected Parameters

The implementation of this feature affects no parameters.

However, the reference between the RF branch and the RRU will be affectedin the initial configuration of the eNodeB. For detailed information, see thefigures in Section 7 on page 15.

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Network Impact

4 Network Impact

This section describes how the Cross-Sector Antenna Sharing Redundancyfeature impacts the network functions and capabilities.

During normal operation, the implementation of this feature has no impacton the network.

However, in case of a hardware fault, the eNodeB will run in degraded mode,with one TX/RX branch.

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Associated Features and Affected Functions

5 Associated Features and AffectedFunctions

This section describes how the Cross-Sector Antenna Sharing Redundancyfeature affects other features and functions.

5.1 Prerequisite Features

Table 1 lists prerequisite features to the Cross-Sector Antenna SharingRedundancy feature, that is, they must be active prior to introducing theCross-Sector Antenna Sharing Redundancy feature.

Table 1 Prerequisite Features

Feature Description

Dual-Antenna Downlink PerformancePackage

The Dual-Antenna Downlink Performance Package featureis a prerequisite for the Cross-Sector Antenna SharingRedundancy feature.

5.2 Affected Features

This feature affects no other feature.

5.3 Related Features

This feature is not related to any other feature.

5.4 Affected System Functions

This feature affects no system functions.

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Performance

6 Performance

This section describes performance indicators, counters, and events associatedwith the Cross-Sector Antenna Sharing Redundancy feature.

6.1 KPIs

During normal operation, this feature has no associated Key PerformanceIndicators (KPIs).

However, in case of a hardware fault,Table 2 lists the main KPIs associatedwith the Cross-Sector Antenna Sharing Redundancy feature.

Table 2 KPIs

KPI Description

Availability During a hardware fault, the redundancy provided by the feature willincrease cell availability.

Integrity The redundancy provided by the feature will increase throughput for one ofthe two sectors connected to the faulty hardware. The second sector willhave decreased throughput.

6.2 Counters

This feature has no directly associated counters.

6.3 Events

This feature has no associated events.

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O&M Information

7 O&M Information

This section provides Operation and Maintenance (O&M) information for theCross-Sector Antenna Sharing Redundancy feature.

General fault management activities are described in Fault Management.

The connections between the hardware and the MO structure for this type ofantenna feeder configuration are described in the following sections.

7.1 Basic Configuration

Figure 4 shows an example of the connections between the hardware andthe MO structure for a basic three-sector configuration with the Cross-SectorAntenna Sharing Redundancy feature.

L0000449A

Figure 4 Example of Three-Sector Configuration with Cross-Sector Antenna SharingRedundancy

7.2 Configuration with RET via the RET-port

Figure 5 shows an example of the connections between the hardware and theMO structure for a two-sector configuration with RET and RET port.

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L0000453B

AntennaUnitGroup=1 Antenna

UnitGroup=2

AntennaSubUnit=1 Antenna

SubUnit=1

AntennaNearUnit=1 Antenna

NearUnit=1

RetSubUnit=1 Ret

SubUnit=1

AntennaUnit=1 Antenna

Unit=1

Figure 5 Example of Two-Sector Configuration with RET and RET Port

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toc1 Introduction1.1 Basic CharacteristicsDependencies1.2 Benefits2 Feature Operation2.1 Feature Implementations2.1.1 Implementations with RET2.1.1.1 Cross-Sector Antenna Sharing Redundancy with RET and RIU2.1.1.2 Cross-Sector Antenna Sharing Redundancy with RET through2.2 Network Requirements3 Parameters3.1 Introduced Parameters3.2 Affected Parameters4 Network Impact5 Associated Features and Affected Functions5.1 Prerequisite Features5.2 Affected Features5.3 Related Features5.4 Affected System Functions6 Performance 6.1 KPIs6.2 Counters6.3 Events7 O&M Information7.1 Basic Configuration7.2 Configuration with RET via the RET-port

Cross-Sector Antenna Sharing Redundancy.pdf

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