meridian   Optimizing Wide-area  Wireless Services

Multilayer Protocol Benchmarking

Wide-area wireless data coverage is available today primarily through cellular technologies. However, provisioning consistent high-bandwidth data performance to users is a challenge for any cellular provider. The combined effects of long range wireless links and high user mobility in these environments manifest as hindrances - high and variable path latencies, packet losses, burstiness, and occasional link outages. In our work, we have demonstrated approaches along different dimensions to mitigate some of these problems. Through deployment and experimentation of our techniques on commercial systems with real users, we proved that our techniques often achieve a factor of two or more improvements in throughputs and latencies.

Our work is a detailed evaluation of protocol bottlenecks in wide-area data services, focusing on the web browsing application. In particular, we studied potential optimizations applicable at different protocol layers - data link, network, transport, session, application - and found both positive and negative interactions among these optimizations. Our major finding was that by employing some specific optimizations at the session and application layers and dynamically tuning their parameters, web browsing in wide-area wireless environments can be improved by 50-100%. This was the first evaluation of cellular data performance through measurements, and real deployment in multiple commercial networks.

->  Overview Why optimize services?
->  Deployment Commercial Vodafone cellular GPRS network
->  Screenshots Screenshots of some interesting traces
->  Source Code Details and source code

Optimizing Wide-area Wireless Services

Cambridge Open Mobile System

University of Cambridge Computer Laboratory