Vehicular networks are characterized by a highly dynamic network topology, and disruptive and intermittent
connectivity. In such network environments, a complete path from source to destination does
not exist on the most part of the time. Vehicular delay-tolerant network (VDTN) architecture was introduced
to deal with these connectivity constraints. VDTN assumes asynchronous, bundle-oriented
communication, and a store-carry-and-forward routing paradigm. A routing protocol for VDTNs should
make the best use of the tight resources available in network nodes to create a multi-hop path that exists
over time. This paper proposes a VDTN routing protocol, called GeoSpray, which takes routing decisions
based on geographical location data, and combines a hybrid approach between multiple-copy and singlecopy
schemes. First, it starts with a multiple-copy scheme, spreading a limited number of bundle copies,
in order to exploit alternative paths. Then, it switches to a forwarding scheme, which takes advantage of
additional contact opportunities. In order to improve resources utilization, it clears delivered bundles
across the network nodes. It is shown that GeoSpray improves significantly the delivery probability
and reduces the delivery delay, compared to traditional location and non location-based single-copy
and multiple-copy routing protocols.
Vehicular networks are characterized by a highly dynamic network topology, and disruptive and intermittentconnectivity. In such network environments, a complete path from source to destination doesnot exist on the most part of the time. Vehicular delay-tolerant network (VDTN) architecture was introducedto deal with these connectivity constraints. VDTN assumes asynchronous, bundle-orientedcommunication, and a store-carry-and-forward routing paradigm. A routing protocol for VDTNs shouldmake the best use of the tight resources available in network nodes to create a multi-hop path that existsover time. This paper proposes a VDTN routing protocol, called GeoSpray, which takes routing decisionsbased on geographical location data, and combines a hybrid approach between multiple-copy and singlecopyschemes. First, it starts with a multiple-copy scheme, spreading a limited number of bundle copies,in order to exploit alternative paths. Then, it switches to a forwarding scheme, which takes advantage ofadditional contact opportunities. In order to improve resources utilization, it clears delivered bundlesacross the network nodes. It is shown that GeoSpray improves significantly the delivery probabilityand reduces the delivery delay, compared to traditional location and non location-based single-copyand multiple-copy routing protocols.
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