改进的无线Mesh网路由判据算法及其路由协议

摘要

为了改善802.11s无线Mesh网传输过程中因重传次数过大而造成的丢包问题，根据实际无线传输中的网络重传次数特性，提出一种基于最大重传次数的空中传播时间改进路由判据算法.同时为了缓解因单根节点造成的网络拥塞，提高实际场景中边缘节点的传输性能，并保证网络中所有节点使用无线信道资源的公平性，基于树的寻径机制从拓扑结构的角度，提出一种改进的多根节点的混合无线 Mesh 网路由协议(M-HWMP).理论及仿真结果表明，改进的路由判据算法及路由协议优化了无线 Mesh 网传输不同数据流时的吞吐量、时延特性，并在一定程度上避免了网络拥塞.%To handle the problem of packet loss caused by the large number of retransmission times in the IEEE 802.11s-based wireless mesh network, a novel airtime link metrics algorithm based on maximum number of retransmission times was proposed according to the retransmission characteristics in the actual wireless network. Meanwhile, an improved Multi-root Hybrid Wireless Mesh Protocol (M-HWMP) based on tree-based rooting mechanism was proposed to alleviate the network congestion caused by the topology with single root node. This modified protocol can also improve the transmission performance of the edge node in some practical scenarios and ensure fairness of the use of wireless channel resources. Theory and simulation results showed that the improved algorithm and protocol can optimize the throughput and delay of different data flows in Wireless Mesh Network, and also can avoid network congestion to some extent.