【摘要】 详述了WiMAX系统的各种带宽请求与分配策略,并重点分析了基于竞争的请求与分配机制。通过对竞争请求的冲突概率进行分析,推出了回退窗口和竞争窗口的最佳分配尺寸,并计算了不同业务流数量下系统可达到的最大传输效率。计算机仿真表明以此尺寸进行分配,可有效减小请求冲突,提高系统的传输效率和带宽使用效率。更多还原

【Abstract】 The paper specifies the bandwidth request and allocation strategies in WiMAX system.Especially,it focuses on the request and allocation mechanisms of contention.The optimal backoff window size and contention window size are given,and the transmission efficiency is calculated by analyzing the collision probability of contention request.The simulation results indicate that it can effectively reduce the collision probability and improve the transmission efficiency and bandwidth utility efficiency to use these window sizes.更多还原