一种低时延的短波自组网优化链路状态路由协议

A Low-latency Optimization Link State Routing Protocol for HF Ad Hoc Networks

优化链路状态路由(Optimized Link State Routing,OLSR)协议是一种先验式路由协议,网络中的所有节点通过周期性地发送控制消息来计算全网路由信息。在短波自组织网络中,节点周期性地发送控制消息会占据大量的信道资源,大幅增加网络的控制开销,浪费短波有限的带宽资源,导致网络通信性能急剧下降。其次,受到地形地貌、天线方向和接收性能的个体差异等影响,造成无线链路不稳定,导致网络中存在非对称链路,增加了通信端到端时延。为此,提出了一种低时延的短波自组网OLSR协议。该协议在执行MPR(Multipoint Relay)选择算法时综合考虑了节点的连接度和链路可靠性,在优化MPR节点个数的同时选择链路可靠性较大的节点作为MPR节点,在进行路由选择时能够利用网络中的非对称链路。仿真结果表明,该协议能优化数据包投递成功率、吞吐量、端到端时延和网络控制开销等性能指标。

Optimized Link State Routing(OLSR)is an active routing protocol.All nodes in the network periodically send control messages to calculate the whole network routing information.In a High Frequency(HF)ad hoc network,the periodic sending of control messages by nodes will occupy a large number of channel resources,greatly increase the network control overhead,waste the limited HF bandwidth resources,and lead to a sharp decline in network communication performance.Secondly,due to the impact of individual differences in topography,antenna direction and receiving performance,the wireless link is unstable,resulting in asymmetric links in the network and increasing end-to-end latency of communication.To this end,a low latency HF ad hoc network OLSR protocol is proposed.This protocol comprehensively considers node connectivity and link reliability when executing the Multipoint Relay(MPR)selection algorithm.While optimizing the number of MPR nodes,the nodes with higher link reliability is selected as the MPR nodes.When routing,the asymmetric link in the network can be used.Simulation results show that the protocol can optimize performance indicators such as packet delivery success rate,throughput,end-to-end latency and network control overhead.