近年來無線網路快速的發展，越來越多的人擁有具隨時通訊能力的行動裝置如PDA或是手機，這種成長適於無線電子商務的發展，更可提供一些不同於傳統電子商務的商務模式。本篇論文中，我們開發了一個以行動代理人(Mobile Agent)為主而開發的電子商務服平台。

此平台的特色之一，在於結合使用者定位技術於服務平台，使得一些位置相關服務(Location-dependent services)得以實現。我們於802.11無線網路上開發了使用者定位技術，提供使用者定位服務(Location Tracking Service)，使得使用者的位置可以做為各項服務的基本參數。

另一個特色是我們提出了服務(Service)與任務(Task)的概念，把各項服務(Service)都分解為一個個的任務(Task)，並由服務代理人(Service Agent)管理系統可得到的資源，並決定該用什麼流程來完成一個服務。我們提出了一個排程的方法，我們以Petri Net為基礎來當做此系統的模型，由服務代理人找出適合的任務流程(Task Sequence)，並能動態的調整。另外在服務的容錯處理(Fault Tolerance)部份，這種動態建構的服務模型可以有效的節省額外的時間成本。

As the wireless communication is raising and flourishing, more and more people are using mobile devices with communication ability, such as PDA and mobile phone. The increase of wireless devices helps the development of Mobile E-Commerce. And the situation provides some different business models from traditional E-Commerce. In this thesis, we develop an Mobile E-Commerce service platform based on mobile agents.

One of the features of the platform is to combine location tracking with the service platform. It makes location-dependent services to be feasible and provide location-tracking service on 80.211 networks available. We developed location tracking on 802.11 wireless networks and provided Location Tracking Service. The location information could be a useful parameter for all services on the platform.

Another feature is that we propose the concept of Service Agents and Task Agents. Every service would be assembled by some tasks. And Service Agent will integrate system resources and decide what is the task sequence of the service. We also propose a scheduling algorithm. The algorithm is modeled and based on Petri Nets. Service agent will find a proper task sequence and modify the sequence dynamically. Furthermore, for the purpose of fault tolerance, the dynamic construction of service is designed to save extra time cost when errors occur.

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