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A cross layer scheme of resource allocation is proposed for the delay sensitive service in OFDMA wireless system. The minimal and maximal rates of users are given according to the delay threshold of the service and queue state info at MAC. The minimal rate guarantees the quality of service and fairness of users, whereas the maximal rate increases the resource usage efficiency. With these rate constraints, the problem model based on the channel sate info at PHY aims to maximize the system throughput. And the allocation algorithm separates into two steps: subcarriers allocation and then power allocation. The simulation results show that the quality of service and user fairness can be guaranteed and the high utilization is better achieved when the proposed scheme is used.
Date of Conference: 26-28 May 2008