This paper addresses the issue of routing in Mobile Ad hoc NETworks (MANETs) using directional antennas. Existing directional routing schemes either assume a complete network topology beforehand or simply use omni-directional routing schemes to forward packets in underlying directional environment. This paper proposes a Directional Routing Protocol (DRP) for MANETs. DRP is an on-demand directional routing protocol which assumes a cross layer interaction between routing and MAC layer and is inspired by Dynamic Source Routing (DSR) protocol. The main features of DRP include an efficient route discovery mechanism, establishment and maintenance of Directional RouTing and Directional Neighbor Tables (DRT and DNT respectively) and novel directional route recovery mechanisms.
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