面向多媒体业务的MANET多尺度稳定链路模型

Multi-scale stable link model for multimedia services in MANET

分析了影响链路稳定性的重要因素,并将其分为任务管理、拓扑管理和信道质量3类因素。在此基础上,提出了一种多尺度稳定链路模型,将此3类指标输入到多属性多权重的中间模块中进行权重分配和加权平均,最终形成综合指标,用以指示链路稳定性。同时利用卡尔曼滤波对模型中检测值进行预测分析,提升模型的稳定性和可靠性。最后,采用本模型对优化链路状态路由协议的路由选路策略进行了优化设计,并在QualNet环境下进行了仿真。仿真实验表明,改进后的协议在报文接收率、吞吐量、端到端时延等方面都有一定的提升,有效地提高了对多媒体业务的服务质量保证能力。

Factors affecting link stability are analyzed and divided into three types of task management, topology management and channel quality. On this basis, a multi-scale stable link model is proposed, in which the three types of factors are imported to a middle module to conduct weight distribution and weighted average and ultimately form a composite indicator to indicate link stability. Meanwhile a Kalman filter is used to analyze and predict the detection value, so as to improve the stability and reliability of the model. Finally, the model is applied to the optimal design of routing strategy in optimized link state routing protocol and some simulation on modified protocol is completed in QuatNet. Simulation results show that the modified protocol has an effective performance improvement in the packet reception rate, throughput, end-to-end delay, etc. which evidently improves the capability to guarantee multimedia services＇ quality of service.