无线应急通信网中基于带宽约束的QoS路由协议

Bandwidth constraint based QoS routing protocol in wireless emergency communication networks

针对日益频发的自然灾害和突发性紧急事件,采用易于快速配置的无线Mesh网络构建应急通信系统是一种可行的技术方案,但救援现场复杂的通信环境对系统的容量、可靠性、QoS等都提出了更高要求。而单信道网络中存在严重的流内和流间干扰,导致系统容量下降,甚至无法提供足够的带宽资源来满足救援现场对可靠传输救援信息的通信需求。提出采用多接口多信道技术来提高系统容量,并以DSR协议为基础,引入改进一种基于带宽估计的QoS路由机制,设计一种应急多接口多信道QoS路由协议——EM2QDSR。在路由判据设计中,充分考虑链路质量、负载均衡及信道多样性的影响。仿真结果表明,该路由协议有效地提高了系统吞吐量和可靠性,减小了传输延时。

For natural disasters and sudden emergencies increasingly arising,deploying an easy-to-configurate wireless Mesh network to rapidly construct an emergency communication system is a feasible technical scheme. While the complex communication environment on the rescue spot requires higher demands on system capacity,reliability,QoS etc. Moreover,the serious inter-flow and intra-flow interference in single-channel network result in a sharp decline in system capacity,which make the system can＇t provide enough bandwidth resources to meet the needs of transmitting rescue information reliablely. This paper proposed Multi-interface multi-channel technology to increase the system capacity. Based on the DSR protocol,introduced and improved an bandwidth estimation based QoS routing mechanisms,then designed an emergency multi-interface multi-channel QoS Routing Protocol——EM2 QDSR. The design of routing metric fully took account into the influence of link quality,load balancing and channel diversity. Simulation results show that the proposed QoS routing protocol effectively improves the system＇s throughput and reduces the delay.