臺灣博碩士論文加值系統

在個人通訊服務的環境中，位置管理是一項非常重要的工作。截至目前為止已有許多位置管理的方法被陸續提出來，我們這篇論文主要是針對其中的繞道遞轉策略(bypass forwarding strategy)[14]進行研究。其作法是當系統發現pointer chain中的某一個VLR發生故障時，系統會送出一些FNV（find next VLR）訊息到發生故障的VLR的鄰居們然後等待回應。當系統收到所有鄰居的回應訊息後，就知道該往哪一個VLR繼續tracing。但在這個的方法中，當系統收到一個以上的正訊息回應時，系統將無法決定該往哪一個VLR繼續tracing，這就是所謂的路徑選擇的問題，而Biaz等人並沒有去加以處理，因此針對這個問題我們提出改良型繞道遞轉策略(improved bypass forwarding strategy)以改進繞道遞轉策略考慮不周詳的地方。
關鍵字：個人通訊服務，位置管理，遞轉指標

In the personal communication service environment, location management is a very important work. So far, there are many methods of location management that have been proposed continuously. The main research direction of this thesis is emphasizing on bypass forwarding strategy to do some research. The method is that if the system detects that one of VLR in the pointer chain breakdowns, then the system will send some FNV (find next VLR) messages to faulted VLR’s neighbors and then wait for response. When the system receives all the responses from the neighbors, it knows which VLR it should keep on tracing. But in this method, when the system receives positive message responses of one and above, it will be unable to determine which VLR it should keep on tracing. This is so-called problem of choosing the path, but Biaz and his partners do not cope with it. Thus, to solve the problem, we propose the improved bypass forwarding strategy to correct the points that are not thoroughly concerned.
Key Words : PCS, Location management, forwarding pointer

封面內頁
簽名頁
授權書.................................................iii
中文摘要...............................................iv
英文摘要...............................................v
誌謝...................................................vi
目錄...................................................vii
圖目錄.................................................ix
符號說明　.............................................x
第一章　緒論...........................................1
第二章 相關研究
2.1 IS-41位置追蹤策略..................................5
2.2 指標遞轉策略.......................................9
2.3 繞道遞轉策略.......................................13
第三章　改良型繞道遞轉策略
3.1 快速回應法.........................................17
3.2 最佳路徑法.........................................21
第四章 效能分析
4.1 分析模型...........................................25
4.2 實驗結果...........................................28
第五章 結論　.........................................31
參考文獻...............................................32
名詞縮寫...............................................34

[1] D. C. Cox, “Wireless Personal Communications: What is it ?”, IEEE Personal Communication Magazine, pp. 20-35, Apr. 1995.
[2] S. Mohan and R. Jain, “Two User Location Strategies for Personal Communication”, pp. 42-50, First Quart 1994.
[3] Y. B. Lin, “Determining the User Location for Personal Communications Services Networks”, IEEE Trans. Vehicular Tech., vol. 43, no. 3, pp. 466-73, Aug. 1994.
[4] T. X. Brown and S. Mohan, ”Mobility Management for Personal Communications systems”, IEEE Transactions on Vehicular Technology, pp. 269-278, May 1997.
[5] B. R. Badrinath et. al.. “Location strategies for personal communication networks”, In Proc. of the IEEE Globecom Workshop on networking of Personal Communication, pp.292-299, December 1993.
[6] P. Krishna, N. H. Vaidya, and D. K. Pradhan, "Location management in distributed mobile environments," In 3rd International Conference on Parallel and Distributed Information Systems, pp. 81-88, September 1994.
[7] F. Akyildiz and J. S. Ho. “On Location Management for Personal Communications Networks”, IEEE Communications Magazine, pp. 138-145, Sept. 1996.
[8] D. R. Wilson, “Signaling System NO.7, IS-41 and Cellular Telephony Networking”, Proc. IEEE, Vol. 80, no. 4, pp. 652-54, Apr. 1992.
[9] M. Mouly and M. –B. Pautet, The GSM System for Mobile Communications, Palaiseau, France, 1992.
[10] Zuji Mao and C. Douligeris, “Lightweight Location Update Strategy for Reducing Signaling and Database Loads in PCS Networks”, Vehicular Technology Conference, 1999. VTC 1999-Fall. IEEE VTS 50th, Vol. 4, pp. 2451-2455, 1999.
[11] K. Wang, J. –M. Liao and J. -M Chen, “Intelligent Locating Tracking Strategy in PCS”, Communications, IEE Proceedings-, Vol. 147 Issue: 1, pp. 63-68, Feb. 2000.
[12] R. Jain and Y.-B Lin. “An Auxiliary User Location Strategy Employing Forwarding Pointers to Reduce Network Impact of PCS”, ACM-JCM wireless Networks, Vol. 2, pp. 197-210, 1995.
[13] R. Jain and Y. -B. Lin, “Performance modeling of an auxiliary user location strategy in a PCS network”, ACM-Baltzer Wireless Network, vol. 1, no. 2, pp. 197-210, 1995.
[14] S. Biaz, and N. H. Vaidya, “Tolerating Visitor Location Register failures in mobile environments”, Reliable Distributed Systems, 1998. Proceedings. Seventeenth IEEE Symposium on, pp.109-117, 1998.