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Joo, Changhee
Learning, Modeling, and Networking
Research Interests
  • Learning, modeling, networking, resource allocation, stochastic optimization, distributed computing, low complexity

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A decentralized spectrum allocation and partitioning scheme for a two-tier macro-femtocell network with downlink beamforming

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Title
A decentralized spectrum allocation and partitioning scheme for a two-tier macro-femtocell network with downlink beamforming
Author
Ryoo, SunheuiJoo, ChangheeBahk, Saewoong
Keywords
Cell capacity; Control overhead; Decentralized algorithms; Downlink beam-forming; Femtocells; Limited information; Macro cells; Outage probability; Performance evaluation; Received signal strength; Spectrum allocation; Spectrum efficiency
Issue Date
201205
Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
Citation
EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING, v.2012, no., pp.1 - 16
Abstract
This article examines spectrum allocation and partitioning schemes to mitigate cross-tier interference under downlink beamforming environments. The enhanced SIR owing to beamforming allows more femtocells to share their spectrum with the macrocell and accordingly improves overall spectrum efficiency. We first design a simplified centralized scheme as the optimum and then propose a practical decentralized algorithm that determines which femtocells to use the full or partitioned spectrum with acceptable control overhead. To exploit limited information of the received signal strength efficiently, we consider two types of probabilistic femtocell base station (HeNB) selection policies. They are equal selection and interference weighted selection policies, and we drive their outage probabilities for a macrocell user. Through performance evaluation, we demonstrate that the outage probability and the cell capacity in our decentralized scheme are significantly better than those in a conventional cochannel deployment scheme. Furthermore, we show that the cell utility in our proposed scheme is close to that in the centralized scheme and better than that in the spectrum partitioning scheme with a fixed ratio.
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DOI
http://dx.doi.org/10.1186/1687-1499-2012-160
ISSN
1687-1499
Appears in Collections:
ECE_Journal Papers
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