Research On Sociality-based Data Delivery Mechanism In Opportunistic Networks

Opportunistic networks is a new type of mobile self-organized network,the network scale is not set in advance,there is no definite link between nodes.Opportunistic networks utilize the communication opportunities arising from node movement to forward messages,and adopt the way of "store-carry-forward" to complete the message transmission.Data are carried by nodes to forward information,so choose the appropriate nodes forward data has become important research problem.In recent years,the research of routing technologies showed that the different properties of nodes lead to different forwarding efficiency.so choose the appropriate node properties to forwarding messages become an important research content.This paper combines the characteristics of social network,as well as features of node properties to research data forwarding mechanism,the main work is as follows:(1)Based-stranger forwarding algorithm was proposed in opportunistic networks.This algorithm define and compute value of strangeness of nodes.when two nodes encounter,the value of strangeness of nodes were sorted.The maximum value of strangeness was selected to incent data forwarding of strangers by using weighted method,it effectively reduces the number of forwarding of the nodes,while ensuring lower transmission delays and higher transmission success rates.Finally BSIF(Based-stranger incentive forwarding algorithm)forwarding algorithm was proposed.(2)A forwarding algorithm based on Attribute of Sociality of Node was proposed in opportunistic networks.This algorithm compute value of strangeness of nodes,betweenness,similarity and Balanced use the resources of multiple nodes to prevent some nodes fast out of the network,.The exit of the node causes the reduction of network connectivity.Under certain conditions the algorithm maintaining low transmission delay and high transmission rate by reducing the number of forwarding of nodes,effectively reduce the transmission overhead of the network.Finally OPAS(Opportunistic network routing algorithm on the Attribute of Sociality)was proposed.In order to verify the validity of the algorithm,this paper simulate the forwading algorithm based on the Attribute of Sociality by opportunistic networks simulation software ONE.The simulation results show that while ensuring lower delivery latency and higher delivery success rate,based on the attribute of sociality the algorithm can reduce network overhead by reducing the number of forwarding between nodes,which improves data delivery ratio and decrease latency.