标题: ART可适性及GPRS延迟的改善
ART Adaptability and GPRS Latency Improving
作者: 朱文如
袁贤铭
资讯科学与工程研究所
关键字: 移植;行动应用程式;J2ME;.NET CF;GPRS latency;ART
公开日期: 2004
摘要: 近年来,行动装置的普及使得行动应用程式蓬勃发展,原本J2ME为行动应用程式执行的主流平台,近来随着.NET CF的崛起,原有的行动应用程式必须移植到.NET CF平台,使得移植的需求愈来愈大,但两平台互不相容,让应用程式的移植面临许多挑战,而且两平台之间缺乏自动或半自动转换的工具,使得从J2ME移植行动应用程式到.NET CF变得费时且困难。
为了解决上述问题,我们将ART的应用范围从原本的J2ME扩大到.NET CF平台,使用ART平台开发的行动应用程式只需要开发一次,便能在这两个平台上显示与操作。依ART架构,我们从网路连线、资料处理、使用者介面及使用者互动处理四个层面分析J2ME和.NET CF平台的异同,提出移植ART的方法。
在ART平台执行的应用程式需要透过网路将程式执行结果以ART讯息的方式从ART server传送到ART client上显示。GPRS是目前行动装置最普遍的上网方式,但是由于GPRS的频宽小且延迟时间长,使得ART讯息无法有效率的传送到ART client。我们根据ART系统的特性,提出一个演算法来缩短ART 讯息在GPRS上传送的时间。
Nowadays, the popularity of mobile devices enhances the development of mobile application. J2ME was the most popular platform for mobile applications originally, but the growth of .NET platform requires a lot of porting of mobile applications from J2ME to .NET platform. Since these two platforms are not compatible, it is challenging in terms of porting applications. Lacking of automatic or semi-automatic transform tool between these two platforms makes porting from J2ME to .NET becomes difficult and inefficient.
To solve problems mentioned above, we extend the appliance of ART from J2ME to .NET platform. Therefore mobile applications developed by ART can be built just once and can display and operate in both platforms. We analyze the difference between J2ME and .NET in four parts: network communication, ART message handling, user interface display, and user interaction handling. We provide methods of porting ART depending on these four parts.
Mobile applications running in ART send the executing result from ART server to ART client by ART messages through network. GPRS is the most popular network on mobile devices. Due to the low bandwidth and high latency of GPRS, transferring ART messages to ART client is inefficient. Based on the characteristics of ART system, we represent two algorithms to decrease the transferring time of ART messages through GPRS.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009223582
http://hdl.handle.net/11536/76633
显示于类别:Thesis


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