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当前许多研究表明,在多跳无线网络中,网络编码技术可以显著提高网络通信性能.首先深入分析研究现有的机会网络编码机制及存在的问题,在此基础上,提出一种通用启发式网络编码协议(GHNC).该协议包含机会转发节点选举、吞吐量计算和动态调整三个过程.其核心思想是:根据网络状况的变化,采用启发式方法自主地改变参与竞争转发节点的个数,以最大化网络吞吐量.另外,考虑到多跳无线网络的动态变化特性以及对服务质量的需求,分别提出动态启发式网络编码协议(DHNC)和快速启发式网络编码协议(FHNC).仿真结果表明,GHNC、DHNC以及FHNC能够快速适应网络环境的变化,显著提高网络性能.
At present, many researches show that network coding can significantly improve network communication performance in multi-hop wireless networks.Firstly, the existing opportunistic network coding mechanism and its existing problems are analyzed in depth, and then a universal heuristic network (GHNC) .This protocol includes three processes, opportunistic forwarding node election, throughput calculation and dynamic adjustment.The core idea is that heuristic method is used to autonomously change the number of nodes participating in competition forwarding according to the change of network status, In order to maximize the throughput of the network, the Dynamic Heuristic Network Coding Protocol (DHNC) and Fast Heuristic Network Coding Scheme (FHNC) are proposed respectively considering the dynamic change characteristics of multi-hop wireless networks and the demands on the quality of service. It shows that GHNC, DHNC and FHNC can quickly adapt to changes in the network environment and significantly improve network performance.