Optimal Resource Allocation and Relay Selection in Bandwidth Exchange Based Cooperative Forwarding

Details Optimal Resource Allocation and Relay Selection in Bandwidth Exchange Based Cooperative Forwarding Optimal Resource Allocation and Relay Selection in Bandwidth Exchange Based Cooperative Forwarding

2011-12-25

arxiv.org/abs/1112.5767v2

Computer Science

Information Theory

8 pages, 6 figures

Scientific paper

In this paper, we investigate joint optimal relay selection and resource allocation under bandwidth exchange (BE) enabled incentivized cooperative forwarding in wireless networks. We consider an autonomous network where N nodes transmit data in the uplink to an access point (AP) / base station (BS). We consider the scenario where each node gets an initial amount (equal, optimal based on direct path or arbitrary) of bandwidth, and uses this bandwidth as a flexible incentive for two hop relaying. We focus on alpha-fair network utility maximization (NUM) in this environment. Our contribution is two-fold. First, we propose an incentivized forwarding based resource allocation algorithm which maximizes the global utility while preserving the initial utility of each cooperative node. Second, defining the link weights of each relay pair as the utility gain due to cooperation (over noncooperation), we show that the optimal relay selection in alpha-fair NUM, often a combinatorially cumbersome problem, reduces to the maximum weighted matching (MWM) in a non-bipartite graph. Numerical results show that the proposed algorithms provide 20-25% gain in spectral efficiency and 90-98% reduction in outage probability.

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