Hikari: DTN message distribution system (モバイルコンピューティングとユビキタス通信)

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Communication and information dissemination is taken for granted in urban areas covered by a robust communication infrastructure. Nevertheless, the majority of the world has limited or no access to information because most of the populated areas are poorly covered by a communication infrastructure. To transport information between these locations we could make use of travellers or nodes that transit in these areas. We propose a DTN publish and subscribe system called Hikari, that uses nodes' mobility in order to distribute messages without using a robust infrastructure. The research area of Delay Tolerant Networks(DTN) aims at providing connectivity between points with network partitions or large delays. The Hikari system uses information about nodes' movement paths, to forward information to remote locations. The path information is advertised by nodes or predicted by the system based on historical information of nodes' trips in the system. Hikari uses a publish and subscribe architecture in where the information flows by using topics of messages or queries from nodes. Therefore Hikari does not use node identifiers for message forwarding thus eliminating the complexity of routing. Information about nodes is not important for the forward decisions, since nodes are just carriers of information. Simulations in the Paris subway system showed us that the Hikari system and its message distribution algorithm achieve a superior deliver rate while keeping redundant messages in the system low, which is ideal when using devices with limited resources for message dissemination.
一般社団法人情報処理学会の論文
2009-01-22

Hikari: DTN message distribution system (モバイルコンピューティングとユビキタス通信)

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