期刊
WIRELESS NETWORKS
卷 15, 期 8, 页码 1059-1073出版社
SPRINGER
DOI: 10.1007/s11276-008-0102-9
关键词
Medium access control (MAC); Ad hoc networks; Directional antennas
资金
- U.S. National Science Foundation [CNS-0721744, DBI-0529012]
- National Science Council (NSC)
- NSC [NSC-96-2811-E-002-010]
- Chunghwa Telecom M-Taiwan Program M-Taoyuan Project
Using directional antennas in ad hoc networks may introduce the well-known deafness problem, exacerbate the hidden terminal problem and the exposed terminal problem, add difficulty on mobile communication, and distort the operation of existing routing and TCP protocols. Although a lot of studies have been undertaken on the directional MAC protocols, most of them focus only on one or several aspects in their design and performance evaluations, and a comprehensive comparative study is missing. In this paper, we first explore the design space of directional MAC and present a taxonomy of existing schemes. Then, we discuss the major problems in using directional antennas under different category of MAC schemes. After that, we propose coordinated directional medium access control (CDMAC), a novel directional MAC protocol to improve throughput via facilitating the simultaneous contention-free communications for multiple local node-pairs. We evaluate our CDMAC, one representative existing scheme and IEEE 802.11 via extensive ns2 simulations. Our results show CDMAC provides a satisfactory solution to all the major problems and significantly improves the throughput performance.
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