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Interfere rejection combining

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Interference Rejection Combining
Feature Description
84/221 04-LZA 701 6014/1 Uen C2
Copyright
© Ericsson AB 2016. All rights reserved. No part of this document may be
reproduced in any form without the written permission of the copyright owner.
Disclaimer
The contents of this document are subject to revision without notice due to
continued progress in methodology, design and manufacturing. Ericsson shall
have no liability for any error or damage of any kind resulting from the use of
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
Interference Rejection Combining Summary
1
1.3
Additional Information
2
2
Feature Operation
3
2.1
Network Requirements
3
2.2
High Level Description
3
2.3
Interference Rejection Combining Process Steps
3
2.4
Eight-way Receiver IRC, TDD only
4
3
Parameters
5
3.1
Introduced Parameters
5
3.2
Affected Parameters
5
4
Network Impact
6
4.1
Capacity
6
4.2
Coverage
6
5
Associated Features and
7
5.1
Prerequisite Features
7
5.2
Affected Features
7
5.3
Related Features
7
5.4
Affected System Functions
7
6
Performance
8
6.1
KPIs
8
6.2
Counters
8
6.3
Events
8
7
O&M Information
9
7.1
Feature Activation and Deactivation
9
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Interference Rejection Combining
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Introduction
1
Introduction
This document describes the Interference Rejection Combining feature and its
main benefits and impacts in the LTE RAN.
This document describes the feature .
1.1
Basic Characteristics
This section describes the basic characteristics of the feature.
Feature Identity
DU Radio Node, see Feature Overview.
Baseband Radio Node, see Licensed Feature
Overview.
Replaces:
N/A
Dependencies
This feature has no prerequisite features.
This feature affects no other features.
1.2
Interference Rejection Combining Summary
This section describes the benefits of this feature.
Interference Rejection Combining (IRC) is a method for antenna combining
and is superior to Maximum Ratio Combining (MRC) when suppressing on
received signals. IRC uses correlations in the spatial domain (between
antennas) and in the frequency domain to suppress interfering signals from
other cells or in-band external interferers. The Interference Rejection
Combining feature improves the Block Error Rate (BLER) on the Physical
Uplink Shared Channel (PUSCH) and Physical Uplink Control Channel
(PUCCH) compared to MRC and improves uplink throughput in uplink
interference limited systems. The use of IRC on uplink channels does not
require any additional User Equipment (UE) support.
IRC also improves false detection and missed detection performance on the
Physical Random Access Channel (PRACH) in an inter-cell interference
scenario. IRC is always available on the PRACH.
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1
Interference Rejection Combining
1.3
Additional Information
More information about this feature and related topics can be found in the
following documentation:
2
•
3GPP TS 36.211
•
3GPP TS 36.212
•
3GPP TS 36.213
•
Applications of Antenna Arrays to Mobile Communications, Part I:
Performance Improvement, Feasibility, and System Considerations
•
Application of Antenna Arrays to Mobile Communications, Part II: BeamForming and Direction-of-Arrival Considerations
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Feature Operation
2
Feature Operation
This section describes the Interference Rejection Combining feature in more
detail, including network configuration requirements and operation flows.
2.1
Network Requirements
This is a licensed feature. This means that for the feature to be operational, a
valid license key must be installed and the feature must be explicitly activated
by setting a MOM attribute. See Section 7.1 on page 9 for more details.
Prior to feature activation, at least two receive antennas must be installed for
the cells on the RBS. If it is a TDD cell, up to eight receive antennas may be
installed.
2.2
High Level Description
The Interference Rejection Combining feature is a form of antenna combining
that is superior to MRC in interference limited systems.
This licensed feature enables the operator to improve the suppression of intercell interference by using Interference Rejection Combining. When the feature
is enabled, the RBS will decide to use the Interference Rejection Combining
feature instead of MRC in interference limited situations.
2.3
Interference Rejection Combining Process Steps
This section describes the main process steps for the feature flow.
2.3.1
Interference Suppression
Figure 1 shows how the Interference Rejection Combining feature can be
used in the antenna combiner rather than MRC to improve interference
suppression.
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3
Interference Rejection Combining
Antenna
combiner
Equalizer
Decoder
L0000494A
Figure 1
IRC As Antenna Combiner Rather than MRC
The Interference Rejection Combining feature maximizes the Signal to
Interference and Noise Ratio (SINR) of the combined signal by minimizing the
noise and interference at the antenna combiner output while preserving the
signal. It can be seen as weighting down the signal in the directions of the
interferers, so that they do not corrupt the signal from the desired user.
2.4
Eight-way Receiver IRC, TDD only
An eight-way receiver IRC solution has been developed for PUCCH, PUSCH
and PRACH, large capacity and coverage improvements are expected when
going from two-way receiver to eight-way receiver diversity.
4
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Parameters
3
Parameters
This section describes the parameters introduced by the Interference
Rejection Combining feature and parameters affected by activating the
feature.
3.1
Introduced Parameters
This feature does not introduce any new parameters.
3.2
Affected Parameters
The implementation of this feature affects no parameters.
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Interference Rejection Combining
4
Network Impact
This section describes how the Interference Rejection Combining feature
impacts the network functions and capabilities.
4.1
Capacity
This section provides information on the impact of the feature on network
capacity.
This feature will increase the uplink capacity of the system.
4.2
Coverage
This section provides information on the impact of the feature on network
coverage.
This feature may increase the coverage active UE in uplink interference
limited environments.
6
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Associated Features and
5
Associated Features and
This section describes how the Interference Rejection Combining feature
affects other features and functions.
5.1
Prerequisite Features
This feature has no prerequisite features.
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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Interference Rejection Combining
6
Performance
This section describes performance indicators, counters, and events
associated with the Interference Rejection Combining feature.
6.1
KPIs
This feature has no associated Key Performance Indicators (KPIs).
6.2
Counters
This feature has no directly associated counters.
6.3
Events
This feature has no associated events.
8
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O&M Information
7
O&M Information
This section provides Operation and Maintenance (O&M) information for the
Interference Rejection Combining feature.
7.1
Feature Activation and Deactivation
Activating the feature requires that the corresponding license is installed.
When the license is installed, an MO instance Irc is automatically created.
Table 1
Feature MO Instance
Node type
MO instance
DU Radio Node
MO instance is
OptionalFeatureLicense =Irc
Baseband Radio Node
MO instance is FeatureState
=Irc
Feature activation and deactivation is described in Manage Licenses.
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