An intelligent mechanism for increasing the bandwidth utilization of Qos applications in ad hoc wireless networks

  • Authors:

  • Chun-Yuan Chiu;Yu-Liang Kuo;Eric Hsiao-Kuang Wu;Gen-Huey Chen

  • Affiliations:

  • Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan;Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan;Department of Computer Science and Information Engineering, National Central University, Chung-Li, Taiwan;Department of Computer Science and Information Engineering, National Taiwan University, Taipei, Taiwan

  • Venue:
  • ELECTROSCIENCE'05 Proceedings of the 5th WSEAS international conference on Applied electromagnetics, wireless and optical communications
  • Year:
  • 2005

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Abstract

The increasing use of ad hoc networks for transferring multimedia applications such as voice, video, and data, leads to the need to provide QoS support. The provision of QoS relies on resource reservation. Precise estimation of remaining bandwidth is an essential part of resource reservation. However, it is difficult even if the ad hoc networks are static. This is because that the remaining bandwidth of each node is relative to the scheduling policy of the adopted MAC layer protocol and may be a probability distribution. In this paper, we first propose an estimation method of remaining bandwidth when the adopted MAC layer protocol is carrier sense multiple access with collision avoidance (CSMA/CA). Since CSMA/CA is a contention-based MAC protocol, arbitrary transmission sequence (schedule) of flows is possible and the bandwidth utilization is inefficient. We propose an intelligent mechanism, called priority number, to avoid some inefficient schedules of CSMA/CA. By the aid of priority number, the remaining bandwidth of each node may be increasing and the bandwidth utilization can be improved.