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|標題:||IEEE 802.16 無線網路之換手協調機制研究
Performance Study of Handoff Schemes in IEEE 802.16 Wireless Networks
|關鍵字:||media independent handover;媒介獨立換手;receiver signal strength indicator;接收訊號強度||出版社:||電機工程學系所||引用:|| IEEE Std 802.16-2004 TM, IEEE Standard for Local and Metropolitan Area Networks - Part 16: Air Interface for Fixed Broadband Wireless Access Systems, Octobert 2004.  IEEE 802 Working group. [Online] http://www.ieee802.org/  IEEE 802.16e, Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems Amendment 2: Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands, December 2005.  IEEE P802.21TM /D00.05, Draft IEEE Standard for Local and Metropolitan Area networks: Media Independent handover Services, January 2006.  WiMAX Forum [Online] http://www.wimaxforum.org/  http://www.ieee802.org/16/  Mobile WiMAX - Part I: A Technical Overview and Performance Evaluation , August 2006.  A. Mäkeläinen ,” Analysis of Handoff Performance in Mobile WiMAX Networks”, Department of Electrical and Communications Engineering , November 2007.  D. H. Lee, K. Kyamakya, and J. P. Umondi “Fast Handover algorithm for IEEE 802.16e Broadband Wireless Access System,” Wireless Pervasive Computing, pp.1-6, Jan 2006.  S. Choi, G.. H. Hwang, T. Kwon, A. R. Lim, and D. H. CHo “Fast Handover Scheme for Real-Time Downlink Services in IEEE 802.16e BWA System,” Proc. IEEE Vehicular Technology Conference, pp. 2028-2032, May 2005.  L. Dimopoulou, G. Leoleis, L. S. Venieris, “Fast Handover Support in a WLAN Environment: Challenges and Perspectives”, IEEE Network, Vol.19, No.2, pp.14-20, 2005.  P. J. Huang, Y. C. Tseng, K. C. Tsai, “A Fast Handoff Mechanism for IEEE 802.11 and IAPP Networks”,IEEE VTC'06, pp. 966-970, 2006.  V. Mhatre, K. Papagiannaki, “Using Smart Triggers for Improved User Performance in 802.11 Wireless Networks”, ACM Mobisys'06, pp.246-259, 2006.  S. Woon, N. Golmie, Y.A. Sekercioglu, “Effective link Triggers to Improve Handover Performance”, IEEE PIMRC06,pp.1-5, 2006.  K. Pahlavan, “Handoff in Hybrid Mobile Data Networks”, IEEE Personal Communications, Vol. 7, No. 2, pp. 34-47, 2000.  B. Aboba, “Architectural Implications of link Indications”, IETF draft-iab-link-indications-10.txt, March 2007.  V. Gupta, D. Johnston, “A Generalized Model for link Layer Triggers”, submission to IEEE 802.21, March 2004.,available at: Http://www.ieee802.org/handoff/march04_meeting_docs/Generalized_triggers-02. pdf.  H. Wu, K. Tan, Y. Zhang, Q. Zhang, “Proactive Scan: Fast Handoff with Smart Triggers for 802.11 Wireless LAN”, to appear IEEE Infocom'07, 2007.  N. Montavont, E. Njedjou, F. Lebeugle, and T. Noel. link Triggers Assisted Optimizations for Mobile IPv4/v6 Vertical Handovers. In Proceedings of the IEEE Symposium on Computers and Communications ISCC'05, pages 289-294, Cartagena, Spain, June 2005. R. Sankar, N. Savkoor, “A Combined Prediction System for Handoffs in Overlaid Wireless Networks”, IEEE ICC'99,pp.760-764, 1999.  S. J. Yoo*, D. Cypher**, N. Golmie**,” Predictive link Trigger Mechanism for Seamless Handovers in Heterogeneous Wireless Networks”, Published online at www3.interscience.wiley.com, Wireless Communications and Moblie Computing.  R. Rouil and N. Golmie, “ Adaptive Channel Scanning for IEEE 802.16e, ” in Proceedings of 25th Annual Military Communications Conference (MILCOM 2006), Washington, D.C., October 23-25, 2006. The National Institute of Standards and Technology (NIST). [Online] http://www.antd.nist.gov/seamlessandsecure/doc.html||摘要:||
目前 IEEE 802.16e 的無線網路環境中是利用硬式換手的機制，當將與下一個目標基地台建立起新的連線時就已經與目前的服務基地台的連線中斷，然而，硬式換手機制在建立連線過程中如果換手程序失敗可能發生無法補救的錯誤。
在本篇論文中，我們提議由IEEE 802.21所制定的MIH機制，並採用它的架構來取代IEEE 802.16e無線網路環境中的換手程序，而在MIH架構中所提出的LGD觸發機制可以應用在換手的環境中使封包的遺失減至最少，當利用接收的RSSI作為觸發機制的一部份時我們並且觀察其效能，當所接收到的訊號強度已經開始低於LGD功率強度門檻時就啟動觸發。利用MIH機制在跟目標基地台建立連線時仍可以成功繼續發布連線訊息給舊的服務基地台，使用MIH的好處是可靠性，因為只有建立新的連線之後才釋放掉舊的連線。
網路模擬軟體NS-2已經成功的在IEEE 802.16e無線網路中模擬出MIH機制，模擬的結果顯示這一個建議方法在IEEE 802.16e的無線網路換手期間可以有效地增加傳輸的吞吐量及降低封包的遺失。
Currently hard handoff is performed for IEEE 802.16e wireless networks while the serving connection under the current BS should break before creating a new connection for the target BS. However, the hard handoff method could cause a unrecoverable damage for the connection if the handoff process fails.
In this thesis we propose a media independent handover (MIH) services, defined in the IEEE 802.21, and adopt this framework to replace the handoff process in IEEE 802.16e wireless networks. The link going down (LGD) trigger form MIH framework can be used to minimize the packet lost while a handover is performed. We also investigate the performance by using the receiver signal strength indicator(RSSI) as part of the trigger mechanism. It is triggered when the received signal level is below the LGD power threshold. Using the MIH method the connection is established to the target BS and after successfully continuing communications the old serving BS is released. The benefit of using MIH is the reliability because only a new connection is established and after that the old connection is released.
The network simulator (NS-2) was successfully used to simulate the MIH method for IEEE 802.16e wireless networks. Simulation results show that the proposed method could effectively increase the transmission throughput and reduce packet lost during the handoff for IEEE 802.16e wireless networks.
|Appears in Collections:||電機工程學系所|
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