tailieunhanh - Báo cáo hóa học: " Research Article An 802.11k Compliant Framework for Cooperative Handoff in Wireless Networks"

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 An Compliant Framework for Cooperative Handoff in Wireless Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 350643 14 pages doi 2009 350643 Research Article An Compliant Framework for Cooperative Handoff in Wireless Networks George Athanasiou 1 Thanasis Korakis 2 and Leandros Tassiulas1 1 Department of Computer and Communications Engineering University of Thessaly 37 Glavani Street 382 21 Volos Greece 2 Department of Electrical and Computer Engineering Polytechnic University 5 Metrotech Center Brooklyn NY 11201 USA Correspondence should be addressed to George Athanasiou gathanas@ Received 17 November 2008 Revised 16 February 2009 Accepted 9 July 2009 Recommended by Wei Li In IEEE wireless networks the stations STAs are associated with the available access points APs and communicate through them. In traditional handoff schemes the STAs get information about the active APs in their neighborhood by scanning the available channels and listening to transmitted beacons. This paper proposes an compliant framework for cooperative handoff where the STAs are informed about the active APs by exchanging information with neighboring STAs. Besides the APs share useful information that can be used by the STAs in a handoff process. In this way we minimize the delay of the scanning procedure. We evaluate the performance of our mechanisms through OPNET simulations. We demonstrate that our scheme reduces the scanning delay up to 92 . Consequently our system is more capable in meeting the needs of QoS-sensitive applications. Copyright 2009 George Athanasiou 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 The IEEE 1 wireless local area networks WLANs were originally designed to give a solution to the significant problem of tangled cables of the end .