An Opportunistic Directional MAC Protocol for Multihop Wireless Networks with Switched Beam Directional Antennas

Directional antennas in multihop wireless networks offer a potential increase in the spatial reuse of the wireless channel. However, existing directional MAC protocols are not capable of fully exploiting this essential benefit. In this paper, we propose OPDMAC which is an opportunistic directional MAC protocol that is motivated by the possibility of achieving higher spatial reuse. The proposed protocol is novel in its backoff mechanism with directional antennas. If a node is forced to backoff due to a missing CTS or acknowledgement in one direction, OPDMAC explores transmission opportunity in other directions. This minimizes the idle wait time of the wireless channel and increase the channel utilization. In addition, OPDMAC is found to decrease the effect of deafness without additional control overhead. Our simulation results show that OPDMAC outperforms existing directional MAC protocols in terms of throughput, delay and fairness.

[1]  Vinay Kolar,et al.  Avoiding head of line blocking in directional antenna [MAC protocol] , 2004, 29th Annual IEEE International Conference on Local Computer Networks.

[2]  Nitin H. Vaidya,et al.  Deafness: a MAC problem in ad hoc networks when using directional antennas , 2004, Proceedings of the 12th IEEE International Conference on Network Protocols, 2004. ICNP 2004..

[3]  Ram Ramanathan,et al.  Ad hoc networking with directional antennas: a complete system solution , 2005, IEEE J. Sel. Areas Commun..

[4]  Nitin H. Vaidya,et al.  On designing MAC protocols for wireless networks using directional antennas , 2006, IEEE Transactions on Mobile Computing.

[5]  Robert E. Hiromoto,et al.  A MAC protocol for mobile ad hoc networks using directional antennas , 2000, 2000 IEEE Wireless Communications and Networking Conference. Conference Record (Cat. No.00TH8540).

[6]  Catherine Rosenberg,et al.  A MAC Protocol forMulti-hop Ad-hoc Networks with Directional Antennas , 2005 .

[7]  Nitin H. Vaidya,et al.  Using directional antennas for medium access control in ad hoc networks , 2002, MobiCom '02.

[8]  Ram Ramanathan,et al.  On the performance of ad hoc networks with beamforming antennas , 2001, MobiHoc '01.

[9]  Leandros Tassiulas,et al.  A MAC protocol for full exploitation of directional antennas in ad-hoc wireless networks , 2003, MobiHoc '03.

[10]  Nitin H. Vaidya,et al.  Medium access control protocols using directional antennas in ad hoc networks , 2000, Proceedings IEEE INFOCOM 2000. Conference on Computer Communications. Nineteenth Annual Joint Conference of the IEEE Computer and Communications Societies (Cat. No.00CH37064).

[11]  Dharma P. Agrawal,et al.  MDA: an efficient directional MAC scheme for wireless ad hoc networks , 2005, GLOBECOM '05. IEEE Global Telecommunications Conference, 2005..

[12]  Aifeng Ren,et al.  Directional virtual carrier sensing for directional antennas in mobile ad hoc networks , 2002, MobiHoc '02.

[13]  Takashi Watanabe,et al.  A Receiver-Initiated Directional MAC Protocol for Handling Deafness in Ad Hoc Networks , 2006, 2006 IEEE International Conference on Communications.