無線網路交握程序之預先認證方法分析與比較

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姓名

吳俊孝(Chun-Hsian Wu) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

無線網路交握程序之預先認證方法分析與比較
(a study of handoff with pre-ahthentication in wireless lan)

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摘要(中)

近年來無線區域網路廣泛的發展，在公開的無線區域網路可提供筆記型電腦或是個人數位助理等移動元件連線使用，對於公共無線區域網路而言，有效而且可靠的認證是重要的議題，然而進行交握程序時，這些繁瑣的認證會造成潛在的延遲，甚至於影響到即時性多媒體傳輸的品質。
在本文中將使用預先認證的機制進行快速的交握程序，依據移動元件的移動特性來決定預先認證運作的方法，過程中擷取點會收集移動元件的移動資訊，利用這些資訊來決定預先認證時間以及保留認證資料時間，當預先認證的時間點到達，此擷取點將通知其他鄰近的擷取點進行認證以及保留認證資料的時間，本文中將比較不同的預先認證時間以及保留認證時間所產生的影響。在模擬結果中顯示，利用“預先認證有效率”以及“保留認證所浪費的資源”兩項參數，可以用以決定如何選擇才是最有效且最節省資源的方式，由於在本文所提出之預先認證機制中考慮了移動元件的行為模式，因此有較佳的實驗結果。

摘要(英)

Recently, wireless LAN systems have been widely deployed for public mobile Internet services. Portable devices, such as laptop computers, Personal Digital Assistants (PDA), can access Internet services through wireless technology in wireless LAN. In the public wireless LAN systems, reliable authentication and mobility support are the most essential issues from the service point of view. However, re-authentication during handoff always causes long handoff latency and this affects the quality of service in real-time multimedia applications.
In this paper, we propose a fast handoff scheme for authentication based on the predictive of mobile behavior. The prediction is made by using the behavior of the mobile devices. Thus, Access Point (AP) collects movement information of mobile devices to decide the time for pre-authentication and the time to reservation. During pre-authentication, AP will notify its neighbor APs for authentication and the time of reservation. The simulation results will illustrate the comparison of the above parameters. In this thesis, both of the authentication effectiveness and the utilization of reserved resources are used to examine the performance of the proposal schemes. As the proposed scheme considers the heuristics of mobile behavior, it demonstrates a quite good performance from our simulation results.

關鍵字(中)

★ 無線區域網路
★ 交握程序
★ 預先認證

關鍵字(英)

★ Handoff
★ Pre-Authentication
★ Wireless LAN

論文目次

摘要 i
目錄 iii
圖目錄 v
表目錄 vii
第一章緒論 1
1.1 簡介 1
1.2 研究動機 2
1.3 論文架構 2
第二章無線區域網路 4
2.1 802.11簡介 4
2.1.1 802.11架構及組成元件 4
2.1.2 802.11服務方式 6
2.1.3 802.11的認證與安全性 9
2.2 802.11系列介紹 11
2.2.1 802.11a/b/g 11
2.2.2 802.11e 12
2.2.3 802.11i 13
2.3 802.11f 14
2.3.1 802.11f的介紹 14
2.3.2 802.11f的實現及運作方式 15
第三章整合無線區域網路 17
3.1 802.1x 17
3.2 認證、授權及計費 19
3.2.1 RADIUS 19
3.2.2 Diameter 20
3.3 異質性網路 21
3.3.1 對等式異質性網路 22
3.3.2 階層式異質性網路 23
第四章隨選式預先認證 25
4.1 預先認證簡介 25
4.2 預先認證優缺點 26
4.3 隨選式預先認證 28
4.3.1 預先認證時間 29
4.3.2 認證對象的選擇 30
4.3.3 保留認證資料的時間 32
第五章模擬環境及結果與數據分析 33
5.1 模擬環境及參數設定 34
5.2 全部預先認證 36
5.2.1 預設值〈DF〉 36
5.2.2 改變預先認證時間與保留時間 38
5.2.3 服務區移動元件數量固定〈SD〉 41
5.3 選擇性預先認證 43
5.3.1 加入移動元件移動模型〈PP〉 44
5.3.2 最高移動路徑預先認證〈HP〉 46
5.4 整合性討論 48
5.4.1 最佳情況選擇 48
5.4.2 擷取點暫存區變化 52
第六章結論與未來工作 54
參考文獻 56
附錄A 擷取點暫存區使用狀況 59

參考文獻

[1] IEEE Std 802.11, 1999 Edition (R2003) (ISO/IEC 8802-11: 1999) IEEE Standard for Information Technology - Telecommunications and Information Exchange between Systems - Local and Metropolitan Area Network - Specific Requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications
[2] IEEE 802.11a-1999 (R2003) (ISO/IEC 8802-11:1999/Amd 1:2000(E)), Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications—Amendment 1: High-speed Physical Layer in the 5 GHz band
[3] 802.11b-1999/Cor1-2001, (R2003) IEEE Standard for Information technology—Telecommunications and information exchange between systems—Local and metropolitan area networks—Specific requirements—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications—Amendment 2: Higher-speed Physical Layer (PHY) extension in the 2.4 GHz band—Corrigendum 1
[4] IEEE 802.11g-2003 IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements -Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications - Amendment 4: Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band
[5] http://www.3gpp.org/
[6] C. Rigney, S. Willens, A. Rubens, W. Simpson, "Remote Authentication Dial In User Service (RADIUS)", RFC2865, June 2000
[7] P. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko, "Diameter Base Protocol", RFC3588, September 2003
[8] IEEE 802.11e/D8 Draft Amendment to Standard [for] for Information Technology-- Telecommunications and Information Exchange Between Systems--LAN/MAN Specific Requirements-- Part 11 Wireless Medium Access Control (MAC) and Physical Layer (PHY) specifications: Medium Access Control (MAC) Quality of Service (QoS) Enhancements
[9] IEEE P802.11i/D10 Unapproved Draft Supplement to Standard for Telecommunications and Information Exchange Between Systems—LAN/MAN Specific Requirements—Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Specification for Enhanced Security
[10] IEEE 802.1X-2001 IEEE Standards for Local and Metropolitan Area Networks: Port-Based Network Access Control
[11] J. Schaad, R. Housley, "Advanced Encryption Standard (AES) Key Wrap Algorithm", RFC3394, September 2002
[12] IEEE 802.11F-2003 IEEE Recommended Practice for Multi-Vendor Access Point Interoperability via an Inter-Access Point Protocol Across Distribution Systems Supporting IEEE 802.11 Operation
[13] L. Blunk, J. Vollbrecht, "PPP Extensible Authentication Protocol (EAP)", RFC2284, March 1998
[14] B. Aboba, P. Calhoun, "RADIUS (Remote Authentication Dial In User Service) Support For Extensible Authentication Protocol (EAP)", RFC3579, September 2003
[15] P. Congdon, B. Aboba, A. Smith, G. Zorn, J. Roese, "IEEE 802.1X Remote Authentication Dial In User Service (RADIUS) Usage Guidelines", RFC3580, September 2003
[16] http://www.microsoft.com/technet/itsolutions/network/security/radiusec.msp
[17] Pat Calhoun, Tony Johansson, Charles Perkins, Tom Hiller, "Diameter Mobile IPv4 Application", , 15 April 2004
[18] Pat Calhoun, Glen Zorn, David Spence, David Mitton, "Diameter Network Access Server Application", , 16 February 2004
[19] 3GPP, "Feasibility study on 3GPP system to Wireless Local Area Network (WLAN) inter-working", 3GPP TR 22.934 v6.2.0, 30 September 2003
[20] Ahmavaara K., Haverinen H., Pichna R., "Interworking architecture between 3GPP and WLAN systems", IEEE Communications Magazine, November 2003, Page(s): 74-81
[21] Koien G.M., Haslestad T., "Security aspects of 3G-WLAN interworking", IEEE Communications Magazine, November 2003, Page(s): 82-88
[22] Sangheon Pack, Yanghee Choi, "Fast Inter-AP Handoff Using Predictive Authentication Scheme in a Public Wireless LAN", in Proc. IEEE Networks 2002, Atlanta, USA, August 2002.
[23] Wee-Seng Soh, Kim H.S., "QoS Provisioning in Cellular Networks Based on Mobility Prediction Techniques", IEEE Communications Magazine, January 2003, Page(s): 86-92
[24] Christian Bettstetter, "Smooth is Better than Sharp: A Random Mobility Model for Simulation of Wireless Networks", Proceedings of the 4th ACM international workshop on Modeling, analysis and simulation of wireless and mobile systems table of contents, 2001, Page(s): 19-27

指導教授

陳彥文(Yen-Wen Chen)

審核日期

2004-6-18

推文