Fairness-Based Dynamic Sub-carrier Assignment for Real Time Services in OFDMA Networks

Konferenz: European Wireless 2014 - 20th European Wireless Conference
14.05.2014 - 16.05.2014 in Barcelona, Spain

Tagungsband: European Wireless 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Rodrigues, Emanuel B. (Wireless Telecommunications Research Group (GTEL), Federal University of Ceara (UFC), Fortaleza, Brazil)
Casadevall, Fernando (Department of Signal Theory and Communications (TSC), Universitat Politecnica de Catalunya (UPC), Barcelona, Spain)

Fairness is a crucial aspect for resource allocation in wireless systems, particularly in the downlink of 4G Orthogonal Frequency Division Multiple Access (OFDMA)-based systems. Therefore, it would be interesting for network operators to have tools to manage fairness in their systems. This work describes the utility-based β-rule, which is a flexible resource allocation framework based on utility theory that is able to control delaybased fairness in a scenario with real time services in an OFDMAbased system. Not only can this framework be designed to work as well-known classical policies found in the literature, but also as an adaptive policy, which is able to meet a desired system fairness target. System-level simulations demonstrate that the adaptive policy is able to guarantee a fairness requirement by dynamically adapting a fairness-controlling parameter in the subcarrier assignment algorithm. It also presents better results than the classical policies in terms of cell capacity and user satisfaction.