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J. Sens. Actuator Netw. 2013, 2(2), 213-234; doi:10.3390/jsan2020213
Article

Channel Allocation in Wireless Networks with Directional Antennas

1,* , 2
 and 3
1 Faculty of Information Technology, Macau University of Science and Technology, Macau 2 Department of Computer Science and Engineering, The Chinese University of Hong Kong, Hong Kong 3 Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
* Author to whom correspondence should be addressed.
Received: 1 March 2013 / Revised: 29 March 2013 / Accepted: 2 April 2013 / Published: 16 April 2013
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Abstract

In this paper, we study the channel allocation in multi-channel wireless ad hoc networks with directional antennas. In particular, we investigate the problem: given a set of wireless nodes equipped with directional antennas, how many channels are needed to ensure collision-free communications? We derive the upper bounds on the number of channels, which heavily depend on the node density and the interference ratio (i.e., the ratio of the interference range to the transmission range). We construct several scenarios to examine the tightness of the derived bounds. We also take the side-lobes and back-lobes as well as the signal path loss into our analysis. Our results can be used to estimate the number of channels required for a practical wireless network (e.g., wireless sensor network) with directional antennas.
Keywords: multiple channels; channel allocation; wireless ad hoc networks; wireless sensor networks; directional antennas; graph theory multiple channels; channel allocation; wireless ad hoc networks; wireless sensor networks; directional antennas; graph theory
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Dai, H.-N.; Ng, K.-W.; Wu, M.-Y. Channel Allocation in Wireless Networks with Directional Antennas. J. Sens. Actuator Netw. 2013, 2, 213-234.

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