AOS中基于QoS业务的跨层带宽分配方法

针对AOS空间通信系统带宽资源有限、传输业务种类繁多等特点导致带宽利用率低、吞吐量下降等问题,提出一种基于QoS的业务跨层带宽分配方法。为满足不同类型业务的QoS要求,联合应用层业务的优先级、数据链路层带宽大小、物理层调制阶数和编码效率构建跨层效用函数。为使分配的带宽更加合理,在效用函数中引入虚拟信道积压队列比和最小保证时隙,利用动态资源规划算法对效用函数最大化求解,进而分配带宽。仿真结果表明,与CBUFM方法以及CBCOT方法相比,该方法降低了各业务队列积压造成的时延,提高了各业务的满意度和带宽利用率,最终提升系统吞吐量,满足各业务QoS要求。

Cross-layer bandwidth allocation method based on QoS service in AOS

To solve the problems of low bandwidth utilization and throughput degradation caused by limited bandwidth resources and various types of transmission services in AOS space communication system,a cross-layer bandwidth allocation method based on QoS was proposed.To meet the QoS requirements of different types of services,the cross-layer utility function was constructed by combining the priority of application layer services,the bandwidth of data link layer,the modulation order and the coding efficiency of physical layer.To make the allocation of bandwidth more reasonable,virtual channel backlog queue ratio and minimum guaranteed time slot were introduced into utility function,and dynamic resource planning algorithm was used to maximize the utility function and allocate bandwidth.The simulation results show that the proposed method reduces the delay caused by the backlog of service queues and improves the service satisfaction and bandwidth utilization,compared with CBUFM method and CBCOT method.At last,it can improve system throughput and satisfy the QoS requirements of different services.