Coordinated beamforming in clustered HetNets: System design and performance evaluation

Shirish Nagaraj*, Frank Hsieh, Deepak Pengoria, M. R. Raghavendra, Mark Schamberger, Michael Honig

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

In this paper, we consider interference issues arising in HetNets where the small-cells are deployed in closely-spaced clusters. Such dense deployments pose an important challenge for scaling throughput proportional to the number of cells, since inter-cell interference becomes a key bottleneck for achieving high capacity. We examine key design issues around the use of coordinated beamforming (CBF) strategies for mitigating inter-small-cell interference in such clustered layouts. In particular, we show that system planning of the sounding reference signal (SRS), along with multi-user channel estimation approaches, are critical to realize the benefits of CBF. We also develop key notions of beneficiary sets and co-operative clusters for enabling such interference mitigation in cellular networks. Through extensive and detailed system simulations, we showcase the benefits of the proposed system designs for two use cases: (1) a dense urban Micro-cellular deployment, and (2) a clustered small-cell Stadium deployment. System parameter optimization of SRS power control and co-operative cluster size are also developed. Significant capacity gains are observed for both these deployments using the proposed system design in clustered small-cell topologies.

Original languageEnglish (US)
Title of host publication2014 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages70-75
Number of pages6
ISBN (Electronic)9781479930869
DOIs
StatePublished - Oct 22 2014
Event2014 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2014 - Istanbul, Turkey
Duration: Apr 6 2014Apr 9 2014

Publication series

Name2014 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2014

Other

Other2014 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2014
CountryTurkey
CityIstanbul
Period4/6/144/9/14

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

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