SpringSim '09 Proceedings of the 2009 Spring Simulation Multiconference
Resource allocation with fairness consideration in OFDMA-based relay networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
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We design the wireless multimedia services system using orthogonal frequency division multiple access (OFDMA) schemes allowing cooperative relays in home area networks. The multihop transmission scheme by relay stations provide reliable services to users in dead spots like the cel- lar or the garden. For this system, we propose an adaptive subcarrier and transmit power allocation method that max- imizes the system total data rate in a downlink transmis- sion. We generally formulate the total data rate maximiza- tion problem and develop a resource allocation scheme to solve it. The scheme is derived via two parts: allocating the resource for users and making a decision to relay or not. Since these two works influence each other, the subcarriers and power should be assigned in consideration of whether to relay or not. We compare the performance of the pro- posed method with existing resource allocation schemes, the 1-hop transmission with dynamic resource allocation and 2- hop transmission with fixed resource allocation. By relay- ing and scheduling gain, the total data rate of the proposed scheme is greater than those of other schemes, and grows as the number of users in the system increases due to multiuser diversity effects.