Content Delivery in Mobile Value-Added Services

• Main Authors: Chuang, Chen-Yuan, 莊鎮遠
• Other Authors: Lin, Yi-Bing
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/86579306685521034249

博士 === 國立交通大學 === 資訊科學與工程研究所 === 101 === 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.