An Improved Utility-based Node Incentive Mechanism in Opportunistic Networks

摘要

In order to solve the problems that node selfishness and the network delay due to node mobility in opportunistic networks, a node cooperation incentive mechanism based on PUR (Price Utility Ratio) was proposed. A digraph taking PUR as weight was constructed, then Dijkstra algorithm was adopted to find one shortest and trusted path. Finally, the optimal path with a shorter delay time and minimum PUR is found through considering the comparison of network delay, which is message transmission path in opportunistic networks. Simulation results and analysis show that, this mechanism can resist the greedy behavior of selfish nodes, enhance the inter-node cooperation, and effectively improve the network performance.