一种提供QoS保证的公平跨层资源分配方案

Cross-layer fair resource allocation scheme with QoS guarantee user fairness

提出了一种基于正交频分多址接入(orthogonal frequency division multiple access,OFDMA)系统的跨层资源分配方案。在保证各种业务服务质量(quality of service,QoS)要求的基础上,以获取系统最大吞吐量为目标,兼顾用户之间资源分配的比例公平性。该方案充分考虑了媒体接入控制(media access control,MAC)层各种业务的QoS要求和无线信道的大尺度衰落特性,将MAC层的分组调度与物理层的资源分配进行联合设计,MAC层根据物理层分配给每个用户的时变信道容量进行分组调度,物理层根据MAC层中各用户的队列状态信息为每个用户分配信道资源。仿真结果表明,该方案可以满足多用户各种业务的QoS要求,与采用等功率分配的依赖信道状态的分组调度(channel state dependent packet scheduling,CSDPS)算法相比可以提高系统下行总吞吐量,且较好地改善具有不同路径损耗的用户之间的公平性。

A new cross-layer resource allocation scheme based on orthogonal,meanwhile frequency division multiple access（OFDMA） systems is proposed to maximize overall downlink throughput achieve all kinds of quality of service（QoS） and fairness.The scheme takes the QoS requirements of the media access control（MAC） layer and the large-scale fading characteristics of wireless channels into account,and makes a joint design of both packet scheduling of the MAC layer and resource allocation of the physical layer.Packets are scheduled on the MAC layer according to each user＇s time-varying channel capacity,and it is decided that how much channel resource on physical layer should be allocated to a certain user by the user＇s queue state information on MAC layer.Simulation results show that this scheme can meet users＇ QoS requirements,increases the downlink total throughput of the system and improves the fairness between users with different path losses compared with channel state dependent packet scheduling（CSDPS）.