基于混合业务QoS保证的WiMAX系统调度算法

针对WiMAX系统特点,提出了一种基于自适应权重的公平调度(AWFS)算法及其简化算法S-AWFS以保证WiMAX系统中混合业务的Qos.算法为每个业务设置一个随信道条件和排队情况而动态变化的带宽分配权值以保证各业务的QoS和系统吞吐量的最大化.简化算法S-AWFS考虑到实用性,对算法的运算量进行了简化.仿真结果表明,AWFS算法及其简化算法能够保证非实时业务的最小传输速率要求以及实时业务的最大时延和最小传输速率要求.S-AWFS算法在降低计算复杂度的同时,获得与AWFS算法相当的性能,满足了WiMAX系统对资源调度算法的要求.

Quality of service-based scheduling algorithm for heterogeneous services in WiMAX systems

Adaptive weight-based fair scheduling(AWFS)algorithm which can ensure the heterogeneous services' quality of service(QoS)requirements in the WiMAX system is proposed.For every service,AWFS algorithm set a weight factor for bandwidth allocation,which is the function of channel condition and queue's length,to ensure all kinds of services' QoS requirements and maximize system performance.S-AWFS(simplified AWFS)algorithm is introduced to decrease the computing complexity.The simulation results show that AWFS algorithm and S-AWFS algorithm can guarantee non-real-time services' minimum rate and real-time services' maximum delay and minimum rate.Furthermore,S-AWFS algorithm obtains almost the same performance,whereas its computing complexity decreases.So S-AWFS algorithm meets the requirements of scheduling algorithm for WiMAX system.