Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 827137, 16 pages
Research Article

A Fuzzy Dropper for Proportional Loss Rate Differentiation under Wireless Network with a Multi-State Channel

Department of Information Management, St. John’s University, 499, Section 4, Tam King Road, Tamsui District, New Taipei City 25135, Taiwan

Received 18 October 2011; Revised 25 January 2012; Accepted 3 February 2012

Academic Editor: Jung-Fa Tsai

Copyright © 2012 Yu-Chin Szu. 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.


The proportional loss rate differentiation (PLD) model was proposed to provide controllable and predictable loss rate for different classes of wired network connections. However, these algorithms cannot be directly applied to wireless networks, because of the location-dependent and time-varying wireless channel capacity. This paper proposes a novel packet dropper for fuzzy controlling of the proportional loss rate differentiation in a wireless network with multistate channel. The proposed dropper, fuzzy proportional loss rate dropper (FPLR), prefers to drop the small packets destined to a poor condition channel to improve the network performance. The loss rate debts of the poor channel will be compensated later to keep PLD. From simulation results, FPLR does achieve accurate loss rate proportion, lower queuing delay and loss rate, and higher throughput, compared with other methods in the wireless environment.