دانلود رایگان مقاله شبکه کاهش زمان تاخیر برای مرور وب تلفن همراه

Abstract

To load a webpage, a web browser first downloads the base HTML file of the page in order to discover the list of objects referenced in the page. This process takes roughly one round-trip time and constitutes a significant portion of the web browsing delay on mobile devices as wireless networks suffer from longer transmission and access delays compared to wired networks. In this work, we propose a solution for eliminating this initial delay, which is transparent to end systems, does not require modifying HTTP, and is well suited for web browsing on mobile devices. Our solution, called WebPro, relies on a network proxy that builds an up-to-date database of resource lists for the websites visited frequently by network users. The proxy resides in the wired part of the network, and hence can afford to pro-actively build and refresh the resource list database periodically. When a request for a webpage comes to the proxy, it simultaneously fetches the base HTML and all referenced objects required to render the webpage using the corresponding resource list stored in the local database. We also show that the benefits of WebPro become more significant by increasing the complexity of webpages as it is able to circumvent the inter-object dependencies in a webpage. We have built a working prototype of WebPro and have used real-world traffic traces along with live experiments over Wi-Fi and LTE networks to assess its performance. Our results show an average of 26% reduction in page load time for a mix of popular web sites chosen from categories such as news, sports and shopping. Moreover, in comparison to another best known proxy-based solution, WebPro provides delay reductions ranging from 5% to 51% for a variety of web sites.

6. Conclusion

In this paper, we proposed a system called WebPro for reducing the latency of mobile web browsing. WebPro is designed to eliminate the initial round-trip time required to discover the list of objects referenced in a webpage by using a previously recorded resource list of the webpage. Using measurements involving real world websites, we showed that within a few hours, the amount of change in the structure of webpages is relatively low, and hence it is feasible for WebPro to maintain an updated resource list of popular websites. We performed a detailed set of experiments to assess the efficiency of a prototype implementation of the system. Our results indicate that WebPro outperforms state-of-the-art in terms of the page load time, though the amount of improvement varies between webpages. This work is a step toward optimizing the existing wireless infrastructure and mobile applications for an improved quality of experience. In the future, we plan to incorporate opportunistic scheduling in WebPro to further reduce the transmission energy consumption on the mobile device during web browsing. We also intend to build an analysis model of WebPro in an attempt to capture the relationship between different parameters of the system.