Details of Research Outputs

目前,IEEE 802.16标准推荐采用基于截断二进制指数回退算法的竞争解决方案.分析了该方案同IEEE 802.11竞争机制的区别,给出了传送机会利用率u、带宽请求延时d以及带宽请求丢失率p_d等性能指标的计算方法.通过性能模拟,讨论了初始化回退窗口W、用户站数目n以及单位时间帧内传送机会数目N_?等参数对性能指标的影响,进而得出基站调整性能参数的一般策略.这些策略对于基站进行上行带宽资源的分配具有指导意义. 

At present, the mandatory contention resolution that shall be supported by IEEE 802.16 is based on truncated binary exponential backoff algorithm. In this paper, the differences of contention mechanism between IEEE 802.16 and IEEE 802.11 are analyzed. The calculations of performance metrics such as the utilization of transmission opportunity u, the delay of bandwidth request d and the drop probability of bandwidth request pd are presented. Based on simulation results, the effects of contention parameters such as the initial window W, the number of subscriber station n and the number of transmission opportunity Nto are discussed. Some policies to adjust the parameters are also provided. These policies are useful for BS to schedule its uplink bandwidth resource.