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研究生:羅健志
研究生(外文):Chien-Chih Lo
論文名稱:一個在無線網路上之電子郵件傳輸系統
論文名稱(外文):An Electronic Mail System on the Wireless Communications Network
指導教授:羅濟群羅濟群引用關係
指導教授(外文):Chi-Chun Lo
學位類別:碩士
校院名稱:國立交通大學
系所名稱:資訊管理所
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:57
中文關鍵詞:電子郵件系統無線網路郵件閘道器郵件協定
外文關鍵詞:wireless communications networkemail gatewayemail protocolgprsphs
相關次數:
  • 被引用被引用:5
  • 點閱點閱:377
  • 評分評分:
  • 下載下載:89
  • 收藏至我的研究室書目清單書目收藏:2
隨著無線上網越來越普及,網際網路上最多人使用的電子郵件,也開始擴展到無線網路的應用上。目前市面上已經有很多具有無線上網能力的機器,其作業系統裡皆附有電子郵件軟體,讓使用者可以直接收發網際網路上的電子郵件。本文將針對目前最為流行的無線上網方式:GPRS(General Packet Radio Service)與PHS(Personal Handyphone System),分析其特性與有線網路的差別,然後探討現有的電子郵件傳輸協定,指出其在無線環境下運作的缺點。接著,我們將提出一個全新的無線電子郵件傳輸協定 (Wireless Mail Transfer Protocol, WMTP),來解決這些問題,它不止是適合在無線網路下運作,並且適用於任何的上網機器,如手機、PDA(Personal Digital Assistant)、個人電腦等。但是為了要與網際網路上的電子郵件系統相連,我們將以WMTP為基礎,設計一個郵件閘道器,讓WMTP與既有的郵件協定相容,而不需要重新改寫以既有協定為基礎的郵件伺服器,如此可以就地解決這些通訊協定在無線環境下的缺點。最後我們將實作出整個系統,並且利用GPRS無線上網來實際測試整個架構的運作,並與舊協定比較相關的測試數據,來驗證我們的設計是否正確,最後結果正如我們所料,WMTP的確是可以大幅改善電子郵件在無線環境下的傳輸效率。
It''s been widely accepted that email is one of the killer applications on internet. The same phenomenon seems will happen again in wireless world. There are presently a lot of wireless communication devices which have built-in email client software on the market. People can directly receive emails from the Internet via these devices. In this paper, we examine the characteristic of GPRS(General Packet Radio Service) and PHS(Personal Handyphone System) which are popular recently, and point out the difference between the wireless communications network and the wired network. We also analyze the present email protocols, point out the drawback of them on the wireless communications network. To overcome the drawback, we propose a all new email transfer protocol, WMTP(Wireless Mail Transfer Protocol). It is suitable for the wireless operating environment. Additionally, it supports all sorts of devices, e.g. cellular phone, personal digital assistant, notebook, etc. In order to interconnect with the existing email systems on the Internet, we also design a mail gateway base on the WMTP. The mail gateway make the WMTP compatible with the existing email protocol which is adopted by most email server in the world. Finally, we have implemented a wireless email transfer system base on mail gateway. We also test the operation of the system via GPRS communications network, and collect the statistics about efficiency. Through experiments, we observe that our system provides significant improvement over existing system for real-life user accesses for email transfer on the wireless communications network.
中文摘要 i
英文摘要 ii
目錄 iii
表列 v
圖列 vi
第一章 緒論 1
1.1 研究動機 1
1.2 研究目的 2
1.3 論文架構 3
第二章 文獻探討 4
2.1 無線網路 4
2.1.1 GSM 5
2.1.2 GPRS 6
2.1.3 PHS 8
2.2 電子郵件的相關協定 9
2.2.1 SMTP 10
2.2.2 POP3 14
2.3 壓縮技術 15
第三章 無線電子郵件傳輸協定 18
3.1 基本架構 18
3.1.1 傳輸量要最少 19
3.1.2 架構簡單 20
3.2 基本資料結構 21
3.3 寄送電子郵件 22
3.3.1 運作流程 22
3.3.2 資料結構 23
3.4 接收電子郵件 26
3.4.1 運作流程 26
3.4.2 資料結構 28
第四章 以WMTP為基礎的電子郵件傳輸系統 32
4.1 系統架構 32
4.2 閘道器架構 35
4.3 代理伺服器架構 37
第五章 系統實做開發與效能評估 39
5.1 系統實做 39
5.2 效能評估 42
第六章 結論與未來方向 45
6.1 結論 45
6.2 未來發展方向 46
參考文獻 47
[1] M. Mouly and M.B. Pautet. "The GSM System for Mobile Communications", 1992.
[2] ETSI "Digital Cellular Telecommunication Systems (Phase 2); Radio Transmission and Reception (GSM 05.05)", France, 1993.
[3] ETSI. "Digital Cellular Telecommunications System (Phase 2+); General Packet Raido Service (GPRS); Service description, Stage 2", v7.1.1., Jan. 2000.
[4] Kevin Johnson. "Internet Email Protocols:A Developer’s Guide", Addison Wesley, 1999.
[5] J. Klensin, Ed.. "Simple Mail Transfer Protocol", RFC 2821, April 2001.
[6] J. Myers and M. Rose. "Post Office Protocol - version 3", RFC 1939, May 1996.
[7] M. Crispin. "Internet Message Access Protocol - Version 4rev1", RFC 2060, December 1996.
[8] D. Crocker. "Standard for the format of ARPA Internet text messages", RFC 822, August 1982.
[9] N. Freed and N. Borenstein. "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996.
[10] N. Freed and N. Borenstein. "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Type", RFC 2046, November 1996.
[11] K. Moore "Multipurpose Internet Mail Extensions (MIME) Part Three: Message Header Extensions for Non-ASCII Text", RFC 2047, November 1996.
[12] N. Freed, J. Klensin, and J. Postel. "Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures", RFC 2048, November 1996.
[13] N. Freed and N. Borenstein. "Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples", RFC 2049, November 1996.
[14] P. Tzerefos, C. Smythe, I. Stergiou, S. Cvetkovic. "A Comparative Study of Simple Mail Transfer Protocol (SMTP), Post Office Protocol (POP) and X.400 Electronic Mail Protocols", Proceedings of the IEEE Conference on Local Computer Networks, 1997.
[15] M.C. Chan and T.Y.C. Woo, "Application of Compaction Technique to Optimizing Wireless Email Transfer", Wireless Communications and Networking Conference, 1999. IEEE, 1999. Page(s): 1533 -1537 vol.3
[16] Debra Tang, Michael Anzenberger, Paul Markovitz, and Michael Wallace. “A Gateway Between MHS(X.400) And SMTP”, U.S. Government Work.
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