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Báo cáo hóa học: " Research Article Reducing the MAC Latency for IEEE 802.11 Vehicular Internet Access"

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 Reducing the MAC Latency for IEEE 802.11 Vehicular Internet Access | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID819168 9 pages doi 10.1155 2010 819168 Research Article Reducing the MAC Latency for IEEE 802.11 Vehicular Internet Access Daehan Kwak 1 Moonsoo Kang 2 and Jeonghoon Mo3 1 UWB Wireless Communications Research Center Inha University Incheon 402-751 Republic of Korea 2 Department of Computer Science and Engineering Chosun University Gwangju 501-759 Republic of Korea 3 Department of Information and Industrial Engineering Younsei University Seoul 120-749 Republic of Korea Correspondence should be addressed to Moonsoo Kang mskang@chosun.ac.kr Received 17 September 2009 Revised 21 April 2010 Accepted 9 May 2010 Academic Editor Kwan L. Yeung Copyright 2010 Daehan Kwak 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 an intermittently connected environment access points are sparsely distributed throughout an area. As mobile users travel along the roadway they can opportunistically connect albeit temporarily to roadside 802.11 Wi-Fi APs for Internet access. Networking characteristics of vehicular Internet access in an intermittently connected environment face numerous challenges such as short periods of connectivity and unpredictable connection times. To meet these challenges we propose an Access Point Report APR protocol where mobile stations opportunistically collaborate by broadcasting an APR to other mobile stations to fully utilize the short-lived connection periods. APR can optimize the use of short connection periods by minimizing the scanning delay and also act as a hint that enables mobile users to predict when connection can be established. 1. Introduction As the word ubiquitous is becoming an essential part of our lives seamless connectivity gains a growing importance. The everlasting