隨著個人通訊系統的蓬勃發展，無線通訊在我們的生活中所扮演的角色已經愈趨重要，GSM(Global System for Mobile Communication)以其優秀的設計及開放的規格很快的成為主流的標準。不過除了語音的傳輸之外，現今生活中對於數據資料的需求，例如天氣資訊、新聞報導甚至是多媒體資訊的需求也逐漸增加，而目前日漸普及的行動電話則是用來下載這些資料進而閱讀使用的最佳平台。在軟體無線電(Software radio)中也討論了各種關於軟體下載及置換的問題，而且除了單純的應用程式下載之外，還更進一步的討論到通訊協定堆疊等核心程式的下載及置換。不過目前在商業上的應用僅侷限於單純的應用程式下載，如日本NTT DoCoMo的i-Mode支援使用者下載Java遊戲到行動電話上，並且在日本市場中擁有廣大的用戶群。
在本論文中，我們針對在行動電話中的人機介面(Man Machine Interface, MMI)下載置換以及在GSM 第三層通訊協定的短訊服務系統(Short Message Service, SMS)作討論。利用Sun的MIDP(Mobile Information Device Profile Specification)並且依據在軟體無線電中定義的可重新設定裝置(Reconfigurable device)的觀念實作出一個實驗平台，以實驗人機介面的下載及置換，並且實作GSM中的增強型短訊服務(Ehanced Messaging Service, EMS)以驗證人機介面的下載功能。

In Personal Communication System (PCS), Global System for Mobile Communication (GSM) is the manstream standard because of its outstanding design and open specification. Software download and replacement are important research topics in software radio. In addition to pure application download, the download and replacement of core software, such as Protocol stack, are also addressed in software radio. But the application of software download in business market is limited to pure application download, for example, NTT DoCoMo i-mode in Japan.
In this thesis, we discuss the Man Machine Interface (MMI) download and replacement in mobile phone and Short Message Service (SMS) located in GSM protocol layer 3. By following the definition of reconfigurable device in software radio, we use MIDP provoded by Sun microsystems to build a MMI download and replacement testbed and implement Ehanced Messaging Service (EMS) defined in GSM to demostrate MMI download.

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