卫星通信资源覆盖率优化调度仿真研究

Optimal Scheduling of Satellite Communication Resources Coverage

对VSAT卫星系统进行资源调度优化,可提高网络的传输效率和各业务的服务质量。传统的分配方法主要是基于用户的调度或基于单载波的链路调度,而对于采用MF-TDMA的VSAT卫星通信系统则存在许多弊端,由于未考虑多频通信中的干扰问题,造成资源分配效率低下。针对卫星通信系统中资源覆盖率较低的问题,提出一种基于有向图的最大权重链路调度算法(MWLS),通过建立网络有向图模型,将MF-TDMA资源分配抽象成有向链路的无冲突调度问题,选取权重最大链路优先分配以减少链路冲突。仿真结果表明,采用最大权重链路调度算法能有效减少时隙碎片,提高资源覆盖率。

By optimizing resource scheduling for VSAT satellite system, network transmission efficiency and quality of service of traffic can be improved. The traditional allocation methods are mainly scheduling based on users or link scheduling based on single carrier, which has many disadvantages for VSAT satellite communication system utilizing MF-TDMA because of low resource allocation efficiency without considering the interference between multi-car- rier communications. In order to solve the problem of low resource coverage in satellite communication system, max weight link scheduling based on oriented graph is proposed. Firstly, the resource allocation is abstracted into the problem of link scheduling without conflicts by means of building network model of oriented graph, and then the link with max weight is allocated with priority to reduce the link conflicts. Simulation results verify that the proposed method can effectively reduce the timeslot fragmentation and improve resource coverage.