Directional Mac with Deafness Solution for Ad Hoc Network

This paper addresses deafness problem that occur when MAC protocols are designed by using directional antennas. Briefly, Deafness is caused when two nodes are busy in ongoing transmission and another node (Deaf Node) wants to communicate with any of these busy nodes. But it gets no response because transmission of two nodes is in process. This paper proposes DMAC/DS (Directional MAC with Deafness Solution) to overcome the deafness problem. In DMAC/DS, WTP (Wait for Time Period) frames are transmitted by the transmitter and the receiver after the successful exchange of RTS (Request To Send) and CTS (Clear To Send) directionally to notify the ongoing communication to potential transmitter node that may experience deafness. We evaluate our protocol through extensive simulation study with different values of parameters such as the number of flows, data size and bandwidth. The experimental results show that DMAC/DS outperforms existing directional MAC protocols, such as DMAC/DA (MAC with Deafness Avoidance) and MDA (MAC protocol for Directional Antennas), in terms of throughput, RTS failure ratio, and control overhead.