一种适用于B3G移动通信系统下行共享信道的调度算法

本文针对后三代(B3G)移动通信系统中的宽带无线信道特性和流媒体业务特征,分析了可用于高速下行共享信道的各种传统分组调度算法,提出面向流媒体业务能够提高系统吞吐量的基于优先级公平调度(Priority-Based Fairness Scheduling,PBFS)算法.该算法根据各移动用户收发信道质量和业务传输的QoS要求动态调整各用户的业务传输优先级,确定下行共享信道的调度方案.并给出该算法的简化形式S-PBFS.仿真结果表明,与传统调度算法相比,S-PBFS算法在数据包传输时延受限的条件下具有无线信道利用率高、实现复杂度低等特点.

A Scheduling Algorithm for Downlink Shared Channel in Beyond 3G Mobile Communications System

Traditional packet scheduling algorithms for high-speed downlink shared channel are investigated with the consideration of streaming services and wideband wireless channel in beyond 3rd generation mobile communication system.A Priority-Based Fairness Scheduling (PBFS) algorithm is proposed for streaming services transmission and system throughput enhancement.The PBFS algorithm makes packet scheduling scheme in downlink shared channel based on the users' priorities,which are dynamically adjusted according to the quality of wireless channel and the QoS requirement of streaming services.Simplified PBFS (S-PBFS) is also derived.Simulation results show that the new scheduling algorithm has the benefits of lower complexity,higher wireless channel utilization efficiency under the constraint of transfer delay,compared to the traditional scheduling algorithms.