基于OLSR协议的无人机自组网多径路由策略

针对现有文献在研究路由协议时选择的路由度量未能结合无人机自组织网络当时的性能水平进而造成路由决策不合理的问题，提出了一种具有负载感知和网络拓扑变动感知能力的多指标多径优化链路状态路由协议（optimized link state routing protocol based on multi-indicator and multi-path，MIMP-OLSR）。该协议首先考虑了无人机场景的节点移动特性和网络的生存时间，并定义了三个用于进行路由选择的指标，即节点的MAC层阻塞度、节点的邻居变化率和节点的多点中继选择节点（multi-point relay selector，MPR_S）邻居数目；其次，结合HELLO和TC两种控制消息提出了一种指标通告机制，用于将指标信息洪泛给全网节点；最后，根据指标信息提出了一种多径路由方案。仿真结果表明，与OLSR、SETT_MPOLSR和UAV-OLSR协议相比，所提协议MIMP-OLSR在成功率、端到端时延和吞吐量性能上均有明显提高，进而证明所提多径路由方案的合理性。

Multi-path routing strategy of UAV Ad hoc network based on OLSR protocol

Aiming at the problem that the routing metric selected in the research of routing protocols in the existing literature fails to combine the performance level of the UAV self-organizing network at that time and results in unreasonable routing decisions, this paper proposed a multi-indicator and multi-path optimized link state routing protocol with load awareness and network topology change awareness. Firstly, the proposed protocol considered the mobility characteristics of nodes and the lifetime of the network in the UAV scene, and defined three indicators for routing, namely the node''s MAC layer blocking degree, the node''s neighbor change rate and the number of MPR_S neighbors of the node. Secondly, combined with HELLO and TC control messages, this paper proposed an indicator notification mechanism to flood the indicator information to the whole nodes of the network. Finally, according to the indicator information, this paper proposed a multi-path routing scheme. The simulation results show that compared with OLSR, SETT_MPOLSR and UAV-OLSR protocols, the proposed MIMP-OLSR protocol significantly improves success rate, end-to-end delay and throughput performance, which further proves the rationality of the proposed multipath routing scheme.