| Fair data scheduling in OFDM wireless networks based on maximizing utility |
| |
| 作者姓名： | 郭坤祺 孙立新 贾世楼 |
| |
| 作者单位： | Communication Research Center Harbin Institute of Technology，Dept. of Communication Engineering，Harbin University of Science and Technology，Communication Research Center，Harbin Institute of Technology，Harbin 150001，China，Harbin 150052，China，Harbin 150001，China |
| |
| 摘 要： | This paper proposes a joint layer scheme for fair downlink data scheduling in multiuser OFDM wireless networks. Based on the optimization model formulated as the maximization of total utility function with respect to the mean waiting time of user queue,we present an algorithm with low complexity for dynamic subcarrier allocation (DSA). The decision for subcarrier allocation was made according to delay utility function obtained by the algorithm that instantaneously estimated both channel condition and queue length using an exponentially weighted low-pass time window and pilot signals respectively. The complexity of algorithm was reduced by varying the length of the time window to make use of time diversity,which provided higher throughput ratio. Simulation results demonstrate that compared with the conventional approach,the proposed scheme achieves better performance and can significantly improve fairness among users,with very limited delay performance degradation by using a decreasing concave utility function when the traffic load increases.
|
| 关 键 词： | OFDM 接头分层 最优化处理 DSA |
| 文章编号： | 1005-9113（2007）06-0875-05 |
| 收稿时间： | 2006-05-12 |
Fair data scheduling in OFDM wireless networks based on maximizing utility |
| |
| GUO Kun-qi , SUN Li-xin, JIA Shi-lou.Fair data scheduling in OFDM wireless networks based on maximizing utility[J].Journal of Harbin Institute of Technology,2007,14(6):875-879. |
| |
| Authors: | GUO Kun-qi SUN Li-xin JIA Shi-lou |
| |
| Abstract: | This paper proposes a joint layer scheme for fair downlink data scheduling in multiuser OFDM wireless networks. Based on the optimization model formulated as the maximization of total utility function with respect to the mean waiting time of user queue,we present an algorithm with low complexity for dynamic subcarrier allocation (DSA). The decision for subcarrier allocation was made according to delay utility function obtained by the algorithm that instantaneously estimated both channel condition and queue length using an exponentially weighted low-pass time window and pilot signals respectively. The complexity of algorithm was reduced by varying the length of the time window to make use of time diversity,which provided higher throughput ratio. Simulation results demonstrate that compared with the conventional approach,the proposed scheme achieves better performance and can significantly improve fairness among users,with very limited delay performance degradation by using a decreasing concave utility function when the traffic load increases. |
| |
| Keywords: | fairness scheduling OFDM utility function joint layer optimization DSA |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
