Research On Routing Techology Based On Active Nodes In Opportunity Network

The opportunity to network, also called DTN network(delay/disruption tolerant network), as a new network of end-to-end store-and-forward is widely research and application in recent years, it has the characteristics of tolerate delay, tolerate interruptions. In order to improve the success rate of data transmission in the network, reduce the network delay, a strategy of routing forwarding based on node activity in the opportunity to network is proposed.Firstly, after the model of route forwarding based on node activity fully analyzed the structure of the network, a judgment mode based on environmental similarity is proposed. The forwarding policy will be changed on time when the message stays in the same node for too long time. By the way of judging the environment similarity to transfer message to other groups and forwarding policy based on prediction of activity, in order to improve the utilization of node resource.Secondly, to improve the transmission efficiency of the networking opportunities,a model of route forwarding based on node activity is proposed. The model takes predict activity of node as forwarding basis. Transfer the message to the node with higher activity, looking forward to close the message destination node to complete the message delivery process.Then, the model propose a complete message handling mechanism, which constituted by three algorithms, message discarding, message priority and message receiving mechanism. Combining with the core idea of forwarding model based on node activity, message handling mechanism can control the message locations in network effectively, so that the message with high utility value remain on the high activity node. Playing a greater role to improve network performance and message delivery rate.Finally, the experimenter based on the above routing protocol set up a opportunity to network experiment platform based on the strategy of active nodes forward, through the simulation experiment of chain by agreement in the message delivery rate, the average message transmission delay and network resources to evaluate cost ratio, etc, the experimental results and analysis show that the proposed routing forwarding strategy based on active nodes can significantly increase the rate of message delivery, improve the message delay, reduce the network congestion degree.