Resource allocation with fairness consideration in OFDMA-based relay networks

Authors:
Zhihua Tang;Guo Wei
Affiliations:
Wireless Information Network Lab, University of Science and Technology of China, Anhui, P.R.China;Wireless Information Network Lab, University of Science and Technology of China, Anhui, P.R.China
Venue:
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Year:
2009

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Abstract

This paper considers a broadband cellular orthogonal frequency division multiple access (OFDMA) system with relay nodes operating in decode-and-forward (DF) mode. An optimization problem for relay selection, subcarrier assignment and power allocation that maximizes the downlink capacity with fairness consideration among users is formulated for such a system. Since the problem cannot be solved easily in direct forms, we make continuous relaxation and solve the dual problem of the relaxed problem using a subgradient method. An integer-valued solution is then obtained from the result of the subgradient method. Numerical results show that our proposed algorithm solves the problem with superior capacity performance and low outage probability.