Proceedings of the 10th annual international conference on Mobile computing and networking
Slope based discard: a buffer management scheme for 3G links supporting TCP traffic
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Simulation of 3G DCHs supporting TCP traffic: design, experiments and insights on parameter tuning
Proceedings of the 1st international conference on Simulation tools and techniques for communications, networks and systems & workshops
Using buffer management in 3G radio bearers to enhance end-to-end TCP performance
International Journal of Wireless and Mobile Computing
Wide-area network acceleration for the developing world
USENIXATC'10 Proceedings of the 2010 USENIX conference on USENIX annual technical conference
Optimised local caching in cellular mobile networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Performance evaluation of AQM schemes in rate-varying 3g links
PWC'06 Proceedings of the 11th IFIP TC6 international conference on Personal Wireless Communications
Energy-efficient mobile web in a bundle
Computer Networks: The International Journal of Computer and Telecommunications Networking
| Hi-index | 0.07 |
World over wide-area wireless Global System for Mobile Communication (GSM) networks have been upgraded to support the general packet radio service (GPRS). GPRS brings "always-on" wireless data connectivity at bandwidths comparable to that of conventional fixed-line telephone modems. Unfortunately many users have found the reality to be rather different, experiencing very disappointing performance when, for example, browsing the Web over GPRS. In This work, we show what causes the web and its underlying transport protocol TCP to underperform in a GPRS wide-area wireless environment. We examine why certain GPRS network characteristics interact badly with TCP to yield problems such as: link underutilization for short-lived flows, excess queueing for long-lived flows, ACK compression, poor loss recovery, and gross unfairness between competing flows. We also show that many Web browsers tend to be overly aggressive, and by opening too many simultaneous TCP connections can aggravate matters. We present the design and implementation of a web optimizing proxy system called GPRSWeb that mitigates many of the GPRS link-related performance problems with a simple software update to a mobile device. The update is a link-aware middleware (a local "client proxy") that sits in the mobile device, and communicates with a "server proxy" located at the other end of the wireless link, close to the wired-wireless border. The dual-proxy architecture collectively implements a number of key enhancements-an aggressive caching scheme that employs content-based hash keying to improve hit rates for dynamic content, a preemptive push of Web page support resources to mobile clients, resource adaptation to suit client capabilities, delta encoded data transfer of modified pages, DNS lookup migration, and a UDP-based reliable transport protocol that is specifically optimized for use over GPRS. We show that these enhancements results in significant improvement in web performance over GPRS links.