标题: | 行动加值服务之内容递送研究 Content Delivery in Mobile Value-Added Services |
作者: | 庄镇远 Chuang, Chen-Yuan 林一平 Lin, Yi-Bing 资讯科学与工程研究所 |
关键字: | Android;软体商店;数位版权管理;电子书;推播机制;加值服务;Android;appstore;DRM;e-book;Push;value-added service |
公开日期: | 2012 |
摘要: | 随着iPhone与Android的推出逐渐取代了过去Symbian、Blackberry、Windows Mobile为主的智慧型手机作业系统,也创造了新的行动加值服务生态系统。数位内容除了原有贩售影音服务,消费者开始习惯透过3G行动上网浏览网页以及下载各式各样的app,并且透过较大萤幕的平板装置使用电子书与游戏应用。 在“内容为王”(Content is the King)的时代,以智慧型网路技术为基础的加值服务已相对式微。3G或Wi-Fi上网已是吃到饱服务,如何在Internet上结合业者提供行动终端平台用内容服务变成更重要的议题。在内容服务方面,内容供应商最在乎的是如何保障智慧财产,以及上架成本(或工具可用性)与市场大小。因此,加值服务平台必须满足这些需求,才有机会成功创造营收。 本论文探讨行动加值服务中内容递送的议题。我们首先研究Android作业系统,评估其支援OMA的数位版权管理(DRM)以及app防盗拷机制的能力。因为版权保护能力不足,多数厂商都发展了各自的DRM解决方案。然而,为了让app开发商能够上架到其他软体商店,我们提出一个跨商店的交易架构,让这些有专属DRM保护的app能在其他通路销售及运作以扩展市场。 接着,延续内容保护的研究,相对于软体商店要保护app,电子书服务的DRM保护对象不是电子书阅读器(app)而是电子书(data),因此在电子书阅读器(app)实作的DRM保护可以从Android推广到其它终端平台。然而DRM保护并非免费的午餐,针对电子书阅读器app实作防盗拷机制而造成效能问题,我们也提出一个改善阅读体验的方法。 同时,以往app需开启或背景执行才能Pull或下载新的内容,新的行动平台(如:iPhone、Android、Windows Phone)已提供app开发者推播(Push)机制。我们探讨订阅型内容在Client-Server两端的资料同步问题。虽然推播能够即时更新,降低用户下载时的等待时间,但耗费较多行动环境的有限资源。特别是Push成本效益与内容时效性如何兼顾,我们最后提出一个称为Push-N的方案。 本论文提出的研究成果,涵盖近年来新兴的app软体商店、ePub电子书商店两个下载类服务,以及推播机制提供新闻订阅或软体/电子书更新等,都已经在实务上获得验证,并可以在行动电信网路中作为加值服务系统设计与终端优化的重要指引。 Introduction of iPhone and Android phones have resulted in a new mobile Value-Added Service (VAS) ecosystem and significantly affected the smartphone market previously dominated by Symbian, Blackberry, and Windows Mobile. Meanwhile, the large-screen tablet devices more suitable to the e-book and game services have also become popular. With these devices, in addition to the multimedia digital contents, the consumers tend to access the Internet and download various apps through 3G-cellular service. At the age of “Content is King”, VASs based on Intelligent Network (IN) in telecom networks stop growing up the Average Revenue Per User (ARPU). How to generate a new revenue stream in the Internet becomes more critical topic for the mobile operators. For a Content Provider (CP) or a Service Provider (SP), copyright protection, publish cost and target market are major concerns. Therefore, the VAS platforms must meet the requirements. This dissertation studies on the content delivery in mobile VASs. We first study the Android OS, especially evaluating the implementations on OMA Digital Right Management (DRM) and copy-avoidance for apps. We found that DRM is an open issue on Android devices and vendors have proprietary solutions that are incompatible to each other. In order to assist the app developers to publish their apps to multiple appstores, we propose an inter-store transaction mechanism that does not require the app developers to rewrite their programs. Then we extend the study on DRM-protection to e-book service, in which the contents we protect is the data in apps (i.e. the e-book) rather than the apps themselves (i.e. the e-reader). Our e-reader prototypes are implemented on Android devices, iPhone and Window Phones. We find that the DRM-protection in the e-reader drops performance due to data decryption and affects the user experience. To resolve this problem, we also propose a mechanism that improves the e-readers with DRM-protection. On traditional mobile platforms, WAP-Push mechanism invokes apps to pull or download remote contents over IP networks. Innovative iPhone, Android, and Windows Phones have provided a new Push mechanism. We further study the subscription-based service that can push the new contents from the server to the clients. Although the Push mechanism can update the contents in real-time and reduce the user-waiting time on download, the limited resources in mobile environment are wasted. In particular, the timeliness of content updating and cost efficiency of Push mechanism is a trade-off. We finally propose a solution named Push-N that balances the concerned factors. These research results presented in this dissertation have been proved in practice and can be viewed as a useful foundation for design and optimization of VAS in mobile telecom networks. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079455869 http://hdl.handle.net/11536/71658 |
显示于类别: | Thesis |