混合结构矿井应急救援无线Mesh网络及其路由算法

为提高井下应急救援无线Mesh网络的鲁棒性，提出了基于混合网状网结构的组网模式。在该模式下，无线终端参与无线Mesh网络组网，能够在骨干传输网络出现问题时对数据进行路由转发，从而消除了传统基础设施结构应急救援无线Mesh网络中终端通信对骨干传输网络的绝对依赖。此外，针对该模式下Mesh终端能耗较高的问题，进一步提出了一种改进AODV路由策略。该策略在AODV路由协议的基础上增加了节点类型信息与通信状态信息，根据节点类型与通信状态决定路由选择方式，实现了路由选择过程对Mesh终端的识别与避免，从而节约了无线Mesh终端能量。针对该策略的路由性能的仿真结果表明，该策略相比AODV提高了矿井应急救援无线Mesh网络的吞吐性能、传输稳定性与实时性；当骨干路由节点发生故障时，该策略能够快速重建路由，具有较强的路由恢复能力。

Architecture and routing algorithm of wireless mesh network for underground mine emergency rescue

In order to improve the robustness of the wireless mesh network(WMN)that used for underground mine emergency rescue，a kind of hybrid network architecture was proposed.In this architecture，wireless terminals were equipped with mesh routing function.They could be used as mesh routing nodes when backbone transmission network was broken，so the absolute dependence relationship between wireless terminals and backbone transmission network in the traditional infra-structure network was eliminated.Besides，to reduce the extra energy spending on routing，a new routing mechanism called Revised Ad hoc On-demand Distance Vector(RAODV)was designed.The new routing mechanism was based on Ad hoc On-demand Distance Vector(AODV)routing protocol.Node-type variable and network condition variable were added into the routing discovery algorithm of AODV.With these modifications，RAODV was capable of recognizing and avoiding mesh terminals in route establishing process，so the energy of mesh terminals could be conserved.Simulations for RAODV performance estimation have been carried out，the results indicate that RAODV is better performed on throughput，transmission stability and real-time transmission compared to AODV，and besides，it rebuilds route more quickly when some backbone node was broken in the underground mine emergency rescue WMN.