1. A Deafness Free MAC Protocol for Ad Hoc Networks Using Directional Antennas Jia Feng, Pinyi Ren, and Shuangcheng Yan Department of Electronic Engineering Xi’an Jiaotong University, China IEEE Conference on Industrial Electronics and Applications, ICNSC 2009 1

2. Outline Introduction Related Work Protocol Simulation Conclusion 2

3. 3 Protocol A C B RTS failure Data Deafness Problem

4. Related Work Using Directional Antennas for Medium Access Control in Ad Hoc Networks (DMAC) The Annual International Conference on Mobile Computing and Networking, Mobicom 2002 Deafness Problem 4

5. Related Work CDR-MAC: A Protocol for Full Exploitation of Directional Antennas in Ad Hoc Wireless Networks IEEE Transaction on Mobile Computing 2008 Control Packet overhead 5

6. 6 Protocol Local Information Table

7. 7 Protocol Sender

8. 8 Protocol Receiver

9. 9 Protocol

10. 10 Protocol A D C B AN Data

11. 11 Protocol A D C B AN Data G Cooperation Mechanism

12. Simulator : ns-2 Directional Transmission : 300 meter Data Packet : 512 byte Data Rate : 11 Mbps Topology : Three Scenario 12 Simulation

13. 13 Simulation Node A intends to communicate with node C.

14. 14 Simulation

15. 15 Simulation

16. 16 Simulation

17. 17 Simulation

18. 18 Simulation

19. AN-DMAC addresses issue of deafness, appearing in ad-hoc networks using directional antennas. Performance analysis and simulation results indicate that the proposed AN-DMAC protocol produces no more than 40% control overhead of CDR-MAC does. 19 Conclusion