The application of directional antennas in wireless ad hoc networks offers numerous benefits, such as the extended communication range, the increased spatial reuse, the improved capacity and the suppressed interference. However, directional antennas can cause new location-dependent carrier sensing problems, such as new hidden terminal and deafness problems, which can severely degrade the network performance. Recently, a few schemes have been proposed to address these problems. However, most of these existing methods can only partially solve the hidden terminal and deafness problems. Some of them even bring significant performance overhead. In this paper, we propose a novel MAC protocol, in terms of the busy-tone based directional medium access control (BT-DMAC) protocol. In BT-DMAC, when the transmission is in progress, the sender and the receiver will turn on their omni-directional busy tones to protect the on-going transmission. Integrating with the directional network allocation vector (DNAV), the scheme can almost mitigate the hidden terminal problem and the deafness problem completely. We then propose an analytical model to investigate the throughput performance of BT-DMAC. The numerical results show that BT-DMAC outperforms other existing directional MAC schemes. We next evaluate the performance of BT-DMAC through extensive simulation experiments. The results show that our proposed BT-DMAC scheme has superior performance to other existing solutions, in terms of higher throughput.
Bibliographical noteFunding Information:
Min-You Wu is an IBM Chair Professor in the Department of Computer Science and Engineering at Shanghai Jiao Tong University. He serves as the Chief Scientist at Grid Center of Shanghai Jiao Tong University. He is also a research professor of the University of New Mexico, USA. His research interests include grid computing, wireless networks, sensor networks, overlay networks, multimedia networking, parallel and distributed systems, and compilers for parallel computers. He has published over 150 journal and conference papers in the above areas. His research has been supported by National Science Foundation, DoD, DoE, DARPA, China 863 program, China 973 program, and Natural Science Foundation of China. He is a senior member of IEEE.
- Directional antennas
- Medium access control
- Performance analysis
- Wireless networks