Opportunistic Routing Based On Network Coding Research

Routing protocol is the key technologies for wireless networks.Trad tionalrouting protocols in before transmitting data set transmission paths. each packet,determining a next hop node, then perform a link Lyer retransmission, ifoccurred during transmission loss of data fault transfer, launched a link layerretransmission mechanism. But in the bandwidth resource scarcity situation, substantial priming retransmission will greatly waste resources. Although thetraditional deterministic routing logic is relatively simple, but not fullyconsidered the broadcast property of wireless channel and time variation. Inview of these drawbacks, the MIT Biswas proposes opportunistic routingconcepts. Opportu nistic routing is a routing after selection, through potentialrelay nodes compete, independent judgment next hop node, so as to make fulluse of the broadcast cha racteristic of wireless channel, improve the datatransmission reliability and thro ughput. This paper studies the opportunityrouting based on network coding in MORE protocol, proposed one kind basedon the data block data block data block data block size to estimate the time delaymethod, makes the data block size choice can be used in the wireless networktransmission delay time.Firstly, this paper theoretically analyzes the network coding strategy,combined with network simulation analysis on network coding in wirelesssensor in opportunistic routing principle and feasibility, and points out that it isabout data transmission optimization reasons and the surviving.Secondly, the study and analysis of the MORE protocol working mechanism,MORE protocol in the source node to transmit data packets into beforehandfixed size blocks of data, the predetermined data block mode can not meet theactual transmission is required, aiming at the drawbacks in this paper accordingto the transmission delay in the transmission process of independent adjustmentdata block size design, analysis, modeling.Finally, this paper used C++and python script code, in the networksimulation software of click routing in realizing the conception. Through thesimulation experiment on the old MORE protocol and MORE protocol to improve network performance comparison. The experimental results show that:the improved MORE protocol compared with the old MORE protocol in thechannel utilization, transmission throughput, packet loss rate were improved todifferent degree.