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ALMR: Alternate Link Based Multipath Reactive Routing Protocol for Vehicular Ad hoc Networks (VANETs)
Pavan Kumar Pandey, Vineet Kansal and Abhishek Swaroop

The use of vehicular ad hoc networks (VANETs) is increasing at a rapid rate due to their applicability to solve various traffic related problems and to provide better user experience. The routing is a major challenge in VANETs due to highly dynamic topology. The routing protocols have been classified by researchers as reactive, proactive and hybrid. The Reactive routing approaches in VANETs are used to reduce the overhead of maintaining the routing information which makes them suitable for VANETs. In the present paper, a reactive routing approach has been proposed for VANETS which maintains multiple paths between source and destination for data transmission. The concept of connection termination time (CTT) has been used to select two best disjoints paths. This approach aims solution for the problem of frequent link breakage in VANETs, which is a major problem due to the high mobility of vehicles. Source node uses the principal path first for data transmission and saves the derived path for later use in case principal path becomes unavailable. The simulation experiments performed shows significant performance improvement over popular reactive multipath routing protocols.

Keywords: Alternate link based routing, Multipath routing, Connection termination time, Principal path, Derived path

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