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A Handoff Scheme Directed by Access Points on IEEE 802.11 Wireless Networks
|關鍵字:||Handoff;交遞;Quality of Server;IAPP;RSSI;Roaming;服務品質;存取點間協定(IAPP);訊號強度;漫遊||出版社:||電機工程學系所||引用:|| Ns version 1 -LBNL Network Simulator. http://www-nrg.ee.lbl.gov/ns/, 2007.  S. McCanne and S. Floyd. Ns—Network Simulator. http://www.isi.edu/nsnam/ns/, 2007.  Kevin Fall and Kannan Varadhan, “The ns Manual”, September, 2006.  C. Siva Ram Murthy and B. S. Manoj, “Ad Hoc Wireless Networks Architectures and Protocols”, Prentice Hall PTR, 2004.  R. Neapolitan and K. Naimipour, “Foundations of ALGORITHMS Using C++ Pseudocode”, Jones and Bartlett Computer Science, 2004.  Mattbew S. Gast, “802.11 Wireless Networks”, O'REILLY, 2006.  IEEE Std. 802.11f, “IEEE Trial-Use Recommended Practice for Multi-Vendor Access Point Interoperability via an Inter-Access Point Protocol Across Distribution Systems Supporting IEEE 802.11 Operation”, IEEE, 2003.  L. Zan, J. Wang and L. Bao, “Personal AP Protocol for Mobility Management in IEEE 802.11 Systems”, IEEE Mobile and Ubiquitous Systems: Networking and Services, 2005. MobiQuitous 2005. The Second Annual International Conference, Page(s):418 - 425, July 2005.  G.S. Asstt, A.P. Singh, R.B. Singh, B.S. Sohi, “IAPP Modifications for a Location based Fast hand off Technique in wireles networks”, IEEE Communication System Software and Middleware, First International Conference, Page(s):1-7, Jan 2006.  J.C. Lin, S. Rangarajan, “LIHP: a low latency layer-3 handoff scheme for 802.11 wireless networks”, IEEE World of Wireless, Mobile and Multimedia Networks. International Symposium, Page(s):9 pp. , June 2006.  P.J. Huang, Y. C. Tseng and K.C. Tsai, “A Fast Handoff Mechanism for IEEE 802.11 and IAPP Networks”, IEEE Vehicular Technology Conference. IEEE 63rd, Volume 2, Page(s):966 - 970, 2006.  G. Fan and X. Lu, “Novel service oriented handoffs in heterogeneous wireless networks”, IEEE Quality of Service in Heterogeneous Wired/Wireless Networks, Second International Conference, Page(s):7 pp., Aug. 2005.  S. Pack, H. Jung, T. Kwon and Y. Choi, “A selective neighbor caching scheme for fast handoff in IEEE 802.11 wireless networks”, IEEE Communications, IEEE International Conference, Volume 5, Page(s):3599 - 3603 Vol. 5, May 2005.  T. Manodham, L. Loyola, G. Atoche, and M. Hayasaka, “A seamless handoff scheme with new AP module for wireless LANs support VoIP”, IEEE Applications and the Internet, International Symposium, Page(s):6 pp., Jan. 2006.  C.M. Huang, M.S. Chiang and J.W. Lin, “A link layer assisted fast handoff scheme using the alternative path approach”, IEEE Advanced Information Networking and Applications, 20th International Conference, Volume 1, Page(s):6 pp., April 2006.  L.D. Chou, W.C. Lai, Y.C. Lin, C.M. Huang and C.H. Lin, “Intelligent Agent over WLAN with Seamless Handover and Load Balancing”, IEEE Communication Technology, International Conference Page(s):1 - 7, Nov. 2006.  K.C.K. Tsang, R.S.C. Ho, M.C.M. Tsang, C.L. Wang and F.C.M. Lau, “An adaptive multipath protocol for efficient IP handoff in mobile wireless networks”, IEEE Advanced Information Networking and Applications, 20th International Conference, Volume 1, 18-20 Page(s):6 pp., April 2006.  T.V. Leeuwen, I. Moerman, P. Demeester, “Preserving Streaming Video Quality in Mobile Wireless LAN networks”, Vehicular Technology Conference, IEEE 63rd, Volume 2, Page(s):971 - 975, 2006.  C.T. Chou, K.G. Shin, “An enhanced inter-access point protocol for uniform intra and intersubnet handoffs”, Mobile Computing, IEEE Transactions, Volume 4, Issue 4, Page(s):321 - 334, July-Aug. 2005.  Anna Ren, “Inter-Access Point Protocol (IAPP)”, http://web.it.kth.se/~ren/iapp3/iapp3-1.html, 1997.  IEEE Std., “IEEE 802.11b: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Sepcifications”, 1999.  W.M. Yao, Y.C. Chen, “An enhanced buffer management scheme for fast handover protocol”, IEEE Distributed Computing Systems Workshops, 24th International Conference, Page(s):896 - 901, 2004.  C.S. Li, Y.C. Tseng, H.C. Chao, “A Neighbor Caching Mechanism for Handoff in IEEE 802.11 Wireless Networks”, IEEE Multimedia and Ubiquitous Engineering, International Conference, Page(s):48 - 53, April 2007.  E. Casalicchio, V. Cardellini, S. Tucci, “Design and Performance Evaluation of Mechanisms for Mobile-Devices Handoff Forecast”, IEEE Techniques, Methodologies and Tools for Performance Evaluation of Complex Systems, Workshop, Page(s):64 - 74, Sept. 2005.  H. Fathi, S. S. Chakraborty, R. Prasad, “Optimization of Mobile IPv6-Based Handovers to Support VoIP Services in Wireless Heterogeneous Networks”, IEEE Vehicular Technology, IEEE Transactions, Volume 56, Issue 1, Page(s):260 - 270, Jan. 2007.||摘要:||
IEEE 802.11無線網路提供的行動性為網路使用者帶來更多的便利，如何讓無線行動裝置能夠平滑地在無線基地台(Access Point；AP)之間漫遊，達到無縫交遞，成為無線網路需要克服的問題之一。為降低無線區域網路的交遞延遲對於上層應用程式的影響，我們提出了一個建構於階層式無線網路架構下的快速交遞(Handoff)機制。由於每一個AP所能提供的無線網路服務範圍有限，通常在建構一個無線網路服務區時會使用多個AP共同提供無線網路服務，當無線行動裝置在無線網路服務區中漫遊時，無線行動裝置會依本身與AP之間的訊號品質交遞至適合連線的AP。
在交遞過程中，無線行動裝置使用者正在使用的網路服務會因為無線行動裝置搜尋可連線AP耗費的時間以及切換到新的AP上需要重新連線的影響而遭到中斷。在我們提出的方法中，我們利用IAPP (Inter Access-Point Protocol)來幫助AP完成交遞過程，並配合判斷RSSI (Received Signal Strength Index)來決定交遞時機。交遞過程完全由AP來負責完成，而無線行動裝置則不會發覺自己被AP交遞。此外我們也提出相關的負載平衡機制以平衡各個AP的負載，使網路資源得以平均分配至每個網路使用者。
Mobility of the IEEE 802.11 wireless network offers more convenient for the network users. How to offer wireless mobile device roam around all of the access point smoothly to reach the handoff of seamless is a challenging issue. we proposed a fast handoff scheme in the infrastructure network for reducing the delay of handoff for application. In general, many AP offer wireless network service area cooperatively while building a wireless network environment. Because the basic service area of AP is limited. The Wireless mobile device is base on signal strength index of APs to decide handoff while roam in wireless network.
In process of handoff, the network service that user using will be interrupt because mobile device spent more of time to search new AP and internet re-connected. We not only utilize IAPP (Inter Access-Point Protocol) to help handoff process of AP in our method, but also determine the opportunity of handoff by RSSI (Received Signal Strength Index). The handoff have no effects to the mobile device because all of the handoff process is operated by AP. For averaging the network resource, we also propose the balance of the load scheme to balance the load of APs, additionally.
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