Research On Node Reputation Mechanism In Opportunistic Network Data Shunting

With the rapid development of mobile communication technology and the popularity of smart devices,the increasing mobile data demand of users has caused the the cellular network overloaded and congestion.Therefore,the opportunistic network data offloading and sharing has become a research hotspot in recent years.For the purpose of achieving data offloading,the opportunistic networks adopt the "storage-carry-forward" forwarding paradigm.However,due to the limited bandwidth and power of the forwarding node,the node will exhibit selfishness,which will reduce the enthusiasm of data offloading and sharing in opportunistic networks.In order to solve the selfish problem of the forwarding nodes in opportunistic networks,researchers have proposed a number of incentive mechanisms to reduce the selfishness of nodes and and increase the number of nodes that are willing to act as forwarding nodes.The research work of this paper mainly focuses on the reputation incentive mechanism of nodes on mobile opportunistic networks,and has done the following two research works in the reputation incentive mechanism:(1)based on the SoWatch(Social-based Watchdog system),an EVRA(Expectation Variance based Reputation Algorithm)is proposed.Firstly,in opportunistic networks,a control center is added,and the control center estimates the reputation according to the data distribution of the forwarding node in the latest period of time;secondly,the destination node estimates the reputation value according to the time taken by the forwarding node to complete the data offloading.The forwarding node reputation update value is obtained by weighting the reputation of the destination node and the control center,which accurately reflects the role of the forwarding node in the forwarding process.(2)Based on Social-based Watchdog System(SoWatchdog),a reputation model is constructed.Each node has computation reputation and recommendation reputation,where computation reputation consists of systematic reputation and subjective reputation.In addition,by considering reputation,service level and routing protocol,a novel reputation Prophet routing protocol(re-Prophet)is designed based on Prophet protocol.According to the experimental simulation results,the above two works achieve better performance than the previous algorithms in reducing the node selfishness and increasing the enthusiasm of the nodes to participate in data offloading,and improve the effect of data offloading and sharing.