DTN Data Message Transmission by Inter-vehicle Communication with Help of Road Map and Statistical Traffic Information in VANET

Vehicular mounted mobile computers are getting widely available and the DTN (Delay Tolerant Network) consisting of these vehicular computers is expected to be an information and communication infrastructure. Since distribution of the vehicular computers is not unique, the store-carry-forward approach is appropriate for high reach ability and shorter transmission delay of data messages. Though various ad-hoc and DTN routing protocols have been proposed until now, some of them requires current global information of locations and velocities of mobile wireless nodes and the others require longer transmission delay due to uncertain topology information of the network. This paper proposes a novel DTN routing approach which is a combination of street segment based route detection by using the road map information, the route selection based on transmission delay estimation along each street segment and at each intersection and the dynamic next-hop selection among the neighbor vehicular wireless nodes only by the local location information of all the neighbor ones. Due to no requirements for dynamic global information about mobile wireless network topology and to street segment based route selection, shorter transmission delay and higher reach ability is expected for the data message transmission in vehicular wireless multihop networks.