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提出一种适用于无线多跳网络的网络编码感知的机会转发机制(NCAOF,Network Coding-Aware Opportunistic Forwarding).NCAOF利用无线信道的广播特性,结合机会转发和网络编码,动态确定有编码机会的节点进行编码后机会转发,从而比传统的采用预定节点的转发机制获得更多编码机会.分组转发过程中,中间节点考虑局部拓扑信息及自身负载情况,通过定义的编码收益函数评估节点的机会转发效能,动态选择能获取编码性能更好的分组进行机会编码,并基于编码收益赋以编码分组动态的转发优先级,有效利用编码机会同时避免冗余转发.实验结果表明,相比传统的基于网络编码的转发机制,NCAOF能获得更好的编码机会,并有效提高了网络的吞吐量和分组送达率.
(NCAOF, Network Coding-Aware Opportunistic Forwarding) is proposed in this paper.NCAOF makes use of the broadcast characteristics of wireless channel to combine with opportunistic forwarding and network coding to dynamically identify nodes with coding opportunities And then get more coding opportunities than the traditional forwarding mechanism using a predetermined node.In the packet forwarding process, the intermediate node considers the local topology information and its own load conditions, and evaluates the node’s opportunistic forwarding performance through the defined coding gain function , The dynamic selection can obtain the coding performance of the better packet coding opportunity, and based on the coding of the coding assigned to the packet forwarding dynamic priority, the effective use of coding opportunities while avoiding redundant forwarding.Experimental results show that compared to the traditional network-based coding The forwarding mechanism, NCAOF can get better coding opportunities, and effectively improve the network throughput and packet delivery rate.