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International Journal of Distributed Sensor Networks
Volume 2013 (2013), Article ID 636797, 12 pages
Research Article

A Time Slot Reservation in Modified TDMA-Based Ad Hoc Networks with Directional Antennas

1School of Information Management, Hubei University of Economics, Wuhan Jiangxia District Hidden Dragon Island Development Zone, Wuhan 430205, China
2722 Research and Development Institute, Wuhan, China
3School of Computer Science, Colorado Technical University, Colorado, USA

Received 30 January 2013; Revised 27 August 2013; Accepted 27 August 2013

Academic Editor: Hongju Cheng

Copyright © 2013 Yuan Li et al. 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.


In this paper, we study the bandwidth reservation issue in wireless ad hoc networks with directional antennas. Providing Quality of Service (QoS) support in the wireless ad hoc networks is one of the topics that have received a lot of attention in recent years. QoS provisioning is needed to support multimedia and real-time application in wireless networks. In the Time Division Multiple Accesses (TDMA) frame, the bandwidth is measured by the number of the data time slots. Control slots in the traditional TDMA frame can be used for transmission of the control packets, rather than the transmission of the data packets. We focus on the problem of how to make full use of slots to transmit data packets and do not affect control packets transmission. The purpose is to improve the time slot utilization rate. Based on our proposed modified TDMA frame, a novel time slot reservation algorithm is presented to achieve maximal available path bandwidth. Directional antennas allow transmission energy to be concentrated on a narrow range along a particular direction, which can significantly increase the data rate. The performance of our scheme is analyzed and implemented. Simulation results show that the proposed scheme performs better.