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19 - Time- and frequency-domain e-ICIC with single- and multi-flow carrier aggregation in HetNets

Published online by Cambridge University Press:  05 December 2015

By
Meryem Simsek ,
Mehdi Bennis  and
Ismail Guvenc
Edited by
Alagan Anpalagan ,
Mehdi Bennis  and
Rath Vannithamby
Meryem Simsek
Affiliation:
Dresden University of Technology
Mehdi Bennis
Affiliation:
University of Oulu, Finland
Ismail Guvenc
Affiliation:
Florida International University
Alagan Anpalagan
Affiliation:
Ryerson Polytechnic University, Toronto
Mehdi Bennis
Affiliation:
University of Oulu, Finland
Rath Vannithamby
Affiliation:
Intel Corporation, Portland, Oregon
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Summary

Multi-layer heterogeneous network (HetNet) deployments including small cell base stations (BSs) are considered to be the key to further enhancements of the spectral efficiency achieved in mobile communication networks [1]. Besides the capacity enhancement due to frequency reuse, a limiting factor in HetNets has been identified as inter-cell interference. The 3rd Generation Partnership Project (3GPP) discussed inter-cell interference coordination (ICIC) mechanisms in long term evolution (LTE) Release 8/9 [2]. LTE Release 8/9 ICIC techniques were introduced to primarily save cell-edge user equipments (UEs). They are based on limited frequency domain interference information exchange via the X2 interface, whereby ICIC related X2 messages are defined in the 3GPP standard [3]. In LTE Release 8/9 ICIC, a BS provides information about set of frequency resources in which it is likely to schedule DL transmissions to cell-edge UEs, for the benefit of a neighboring BS. The neighboring BS in turn avoids scheduling its UEs on these frequency resources.

With the growing demand for data services and the introduction of HetNets it has become increasingly difficult to meet a UE's quality of service (QoS) requirements with these mechanisms. To cope with the QoS requirements and growing demand for data services, enhanced ICIC (e-ICIC) solutions have been proposed in LTE Release 10 and further e-ICIC (Fe-ICIC) solutions to reduce cell reference signal (CRS) interference in e-ICIC techniques are discussed in LTE Release 11 [4].

In LTE Release 10 e-ICIC techniques, the focus is on time- and frequency-domain techniques and power-control techniques. While in time-domain techniques, the transmissions of the victim UEs are coordinated in time-domain resources, in frequency-domain techniques, e-ICIC is mainly achieved by frequency-domain orthogonalization. The power-control techniques have been intensively discussed in 3GPP. Hereby, power control is performed by the aggressor cell to reduce inter-cell interference to victim UEs. In 3GPP studies, e-ICIC mechanisms with adaptive resource partitioning, cell range expansion (CRE), and interference coordination/cancellation take a central stage [5].

In the following, the inter-cell interference problem in HetNets is introduced and time- and frequency-domain e-ICIC techniques are discussed based on 3GPP specifications. In addition, single- and multi-flow transmission techniques for e-ICIC and system capacity improvement are described.

Inter-cell interference in HetNets

One of the major features extensively studied for LTE Release 10, also known as LTE-Advanced, is the HetNet coverage and capacity optimization, e.g., through the use of cell-range expansion (CRE) techniques.

Type
Chapter
Information
Design and Deployment of Small Cell Networks , pp. 484 - 501
Publisher: Cambridge University Press
Print publication year: 2015

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References

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