TAILIEUCHUNG - Báo cáo hóa học: "Research Article Fairness and QoS Guarantees of WiMAX OFDMA Scheduling with Fuzzy Controls"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Fairness and QoS Guarantees of WiMAX OFDMA Scheduling with Fuzzy Controls | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID512507 14 pages doi 2009 512507 Research Article Fairness and QoS Guarantees of WiMAX OFDMA Scheduling with Fuzzy Controls Chao-Lieh Chen 1 Jeng-Wei Lee 2 Chi-Yuan Wu 2 and Yau-Hwang Kuo2 1 Department of Electronic Engineering National Kaohsiung First University of Science and Technology Kaohsiung 811 Taiwan 2 Department of Computer Science Information Engineering National Cheng Kung University Tainan 701 Taiwan Correspondence should be addressed to Chao-Lieh Chen frederic@ Received 1 July 2008 Revised 8 December 2008 Accepted 29 December 2008 Recommended by Ekram Hossain A fairness and QoS guaranteed scheduling approach with fuzzy controls FQFCs is proposed for WiMAX OFDMA systems. The controllers respectively adjust priority and transmission opportunity TXOP for each WiMAX connection according to QoS requirements and service classes. The FQFC provides intra- and interclass fairness guarantees by making connections within the same class achieve equal degree of QoS while at the same time making those without QoS requirements equally share the remaining resources. Even in dynamic environments such as mobile WiMAX networks with time-variant traffic specifications the FQFC fairly guarantees delay throughput and jitter which are seldom achieved at the same time by state-of-the-art solutions. Copyright 2009 Chao-Lieh Chen 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. 1. Introduction IEEE standard WiMAX 1 2 is one of the most popular standards for fixed and mobile broadband wireless access systems to provide last mile access. Due to various users with diverse QoS requirements and wireless communication technologies the resource scheduler plays an important role to .

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