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ThinkMind // International Journal On Advances in Telecommunications, volume 3, numbers 3 and 4, 2010 // View article tele_v3_n34_2010_7


Decentralized Spectrum and Power assignment in OFDMA Femtocells: Exploiting Different Levels of Coordination

Authors:
Francisco Bernardo
Ramon Agustí
Jorge Cordero
Carlos Crespo

Keywords: femtocell; self-organization; OFDMA; coordination; performance tradeoff

Abstract:
This paper focuses on the task of spectrum assignment and the transmission power in the context of downlink OFDMA femtocell deployments. Concretely, the paper studies the impact of different levels of coordination between femtocells in a decentralized framework to perform spectrum and transmission power assignment. Two cooperative schemes are proposed, named non-communicative and communicative respectively. In the first case, each femtocell decide the spectrum and power assignment based on users’ reported measurements, which are employed to sense intercell interference, including that from other femtocells or from macrocells in two-layer deployments. In the second case, femtocells are allowed to explicitly communicate other nearby femtocells the radio resource usage. Performance results have been obtained for a realistic indoor femtocell deployment with and without macrocell interference. The paper shows that both schemes based on self-organization can lead to sensible performance improvements over non-cooperative (selfish) schemes in terms of spectral efficiency and power consumption reductions. Finally, the dynamic response of the framework to changes in the network deployment has been analyzed.

Pages: 69 to 79

Copyright: Copyright (c) to authors, 2010. Used with permission.

Publication date: April 6, 2011

Published in: journal

ISSN: 1942-2601

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