Evaluation of auxiliary tone based MAC scheme for wireless ad hoc networks with directional antennas

This paper presents an analytical evaluation of auxiliary tone based MAC scheme that has been proposed to mitigate the directional antenna utilization problems in wireless ad hoc networks. We conducted a comparison study between two different Markov models for auxiliary tone based MAC scheme. In the proposed model in addition to the idle, success, and fail states, also the defer state has been considered that is more realistic. Results show that the proposed scheme outperforms the RTS/CTS based MAC scheme not only in high density networks but also in networks with low probability of transmission and low density networks.