An information retrieval scheme for Delay and Tolerance Networks

Delay and Tolerant Network (DTN) techniques are designed to address data communication challenges in network scenarios, which suffer from intermittent connectivity and frequent partitions. A lot of work about routing has been done, but there is little to provide an efficient information retrieval scheme. A content based information retrieval system for DTNs is studied in this paper. Differing from the denounced information access pattern of Internet, destination host of a request is not required. Content replication and indexing is adopted to accelerate response speed. Each node caches its data to the nodes which is more active, and some nodes stores the indexes to help determining the destination of the queries. Simulation results show that the mechanism of caching and indexing can acquire performance improvement.