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Báo cáo hóa học: " Article ID 598038, 10 pages doi:10.1155/2008/598038 Research Article Hybrid Polling Method for Direct Link Communication for IEEE 802.11 Wireless LANs Woo-Yong Choi"

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 Hybrid Polling Method for Direct Link Communication for IEEE 802.11 Wireless LANs Woo-Yong Choi | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 598038 10 pages doi 10.1155 2008 598038 Research Article Hybrid Polling Method for Direct Link Communication for IEEE 802.11 Wireless LANs Woo-Yong Choi Department of Industrial and Management Systems Engineering College of Engineering Dong-A University 840 Hadan-2-dong Saha-gu Busan 604-714 South Korea Correspondence should be addressed to Woo-Yong Choi wychoi77@dau.ac.kr Received 31 August 2007 Revised 16 April 2008 Accepted 14 August 2008 Recommended by Christian Hartmann The direct link communication between STAtions STAs is one of the techniques to improve the MAC performance of IEEE 802.11 infrastructure networks. For the efficient direct link communication in the literature the simultaneous polling method was proposed to allow the multiple direct data communication to be performed simultaneously. However the efficiency of the simultaneous polling method is affected by the interference condition. To alleviate the problem of the lower polling efficiency with the larger interference range the hybrid polling method is proposed for the direct link communication between STAs in IEEE 802.11 infrastructure networks. By the proposed polling method we can integrate the sequential and simultaneous polling methods properly according to the interference condition. Numerical examples are also presented to show the medium access control MAC performance improvement by the proposed polling method. Copyright 2008 Woo-Yong Choi. 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 The fundamental IEEE 802.11 wireless LAN technology was developed to support two PHY data rates of 1 and 2 Mbps in the industrial science and medical ISM frequency band at 2.4 GHz 1 . Three PHY variants of IEEE 802.11a