Space-Time based on content-based pub/sub in delay tolerance networks

To decrease the delay of message, heighten the ratio of subscribers' satisfying and reduce the traffic in DTN(Delay Tolerance Networks), we propose the weighted STPS (Space-Time based on content-based Pub/Sub algorithm) which is the first to utilize both the contact space and time information of any pair of nodes in history to bulid a multi-level overlay network on the physical DTN which is divided into several fixed and identical grids. The message transmission is realized in the two-level overlay network with the strategy that the weight of interest is used for the brokers select messages to send priorly. The experiment results show that compared with existing technicals, the weighted STPS can be applied to message transmission in DTN more effectively.