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Báo cáo hóa học: " Research Article Beacon-Based Service Publishing Framework in Multiservice Wi-Fi Hotspots"

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 Beacon-Based Service Publishing Framework in Multiservice Wi-Fi Hotspots | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 38463 18 pages doi 10.1155 2007 38463 Research Article Beacon-Based Service Publishing Framework in Multiservice Wi-Fi Hotspots Dario Di Sorte Mauro Femminella and Gianluca Reali Department of Electronic and Information Engineering D.I.E.I. University of Perugia 06125 Perugia Italy Received 7 November 2006 Revised 2 February 2007 Accepted 8 March 2007 Recommended by Lin Cai In an expected future multiaccess and multiservice IEEE 802.11 environment the problem of providing users with useful service-related information to support a correct rapid network selection is expected to become a very important issue. A feasible shortterm 802.11-tailored working solution compliant with existing equipment is to publish service information encoded within the SSID information element within beacon frames. This makes it possible for an operator to implement service publishing in 802.11 networks while waiting for a standardized mechanism. Also this straightforward approach has allowed us to evaluate experimentally the performance of a beacon-based service publishing solution. In fact the main focus of the paper is indeed to present a quantitative comparison of service discovery times between the legacy scenario where the user is forced to associate and authenticate with a network point of access to check its service offer and the enhanced scenario where the set of service-related information is broadcasted within beacons. These discovery times are obtained by processing the results of a measurement campaign performed in a multiaccess service 802.11 environment. This analysis confirms the effectiveness of the beacon-based approach. We also show that the cost in terms of wireless bandwidth consumption of such solution is low. Copyright 2007 Dario Di Sorte et al. This is an open access article distributed under the Creative Commons Attribution License which permits .