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Flying ad hoc network (FANET) provides portable and flexible communicationfor many applications and possesses several unique design challenges; a key oneis the successful delivery of messages to the destination, reliably. Forreliable communication, routing plays an important role, which establishes apath between source and destination on the basis of certain criteria.Conventional routing protocols of FANET generally use a minimum hop countcriterion to find the best route between source and destination, which resultsin lower latency with the consideration that there is single source/destinationnetwork environment. However, in a network with multiple sources, the minimumhop count routing criterion along with the 1-Hop HELLO messages broadcasted byeach node in the network may deteriorate the network performance in terms ofhigh End-to-End (ETE) delay and decrease in the lifetime of the network. Thisresearch work proposes a Reliable link-adaptive position-based routing protocol(RLPR) for FANET. It uses relative speed, signal strength, and energy of thenodes along with the geographic distance towards the destination using aforwarding angle. This angle is used to determine the forwarding zone thatdecreases the undesirable control messages in the network in order to discoverthe route. RLPR enhances the network performance by selecting those relay nodeswhich are in the forwarding zone and whose geographic movement is towards thedestination. Additionally, RLPR selects the next hop with better energy leveland uses signal strength and relative speed of the nodes to achieve highconnectivity-level. Based on the performance evaluation performed in theNetwork simulator (ns-2.35), it has been analysed that RLPR outperforms theRobust and reliable predictive based routing (RARP) and Ad hoc on-demanddistance vector (AODV) protocols in different scenarios.

A Reliable Link-adaptive Position-based Routing Protocol for Flying Ad hoc Network