| Summary: | 碩士 === 國立交通大學 === 資訊科學與工程研究所 === 100 === In recent years, a variety of services have been available to mobile subscribers. Because the number of subscribers grows too fast, the current infrastructure cannot give services to fulfill everyone’s need, which causes reduced data rates and poor service performances.
To solve this problem, we propose Application Proxies into current network design. Mobile Proxy is set at the cell phone end, which has a local cache and manages all sessions so that traffic scheduling can be achieved. Cloud Proxy on the other hand is sited at the external data network namely Internet, which does periodicity crawling to third party application servers. When the content of an application has updated, an short message would be sent to the Mobile Proxy.
With the support of Application Proxies, we may attain the following objectives: (1) eliminate redundant data transmission. (2) reduce network congestion and overloaded cases. (3) maximize data values for individual subscribers. First objective can be realized by content caching at Mobile Proxy, while second and third objectives will be achieved by sophisticated traffic scheduling mechanism. Thus an utility-based scheduling algorithm, which takes service quality and user preferences into consideration is proposed.
The simulation environment is based on mobile network architecture and corresponding traffic models. The result shows that with suitable caching and traffic scheduling method, our goals can be truly achieved.
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