gprsweb GPRSWeb

Rearchitecting the WWW for Cellular Links

Despite the efforts in reengineering transport TCP/IP protocol to work efficiently in cellular GPRS environments, the net end-user experience using TCP based applications, for example, WWW or WAP browsing remain considerably poor. Therefore, instead of using the staple TCP/IP protocol, we devised a new transport layer solution, i.e., a new link-aware transport protocol especially adapted for GPRS cellular links. In this new approach (called GPRSWeb) a  client proxy is installed in the mobile device that communicates with a remote server proxy located at the other end of the wireless link in the cellular operator's network.

The dual-proxy system implements several enhancements such as caching, parse-n-push, dynamic data compression, delta transfers, DNS migration, message flow-control and a receiver-centric NAK-based error recovery mechanism to improve the end-user Web browsing experience. We designed and implemented GPRSWeb consisting of over 20,000 lines of code. Our experimentation over a commercial GPRS network testbed demonstrated that, in many cases, GPRSWeb improved end-user experience by a  factor of two.

->  Overview Overview of GPRSWeb System and Architecture
->  Deployment Vodafone cellular GPRS network deployment.
->  Screenshots Screenshots of interesting traces
->  Source Code Details of the source code.

Rearchitecting the WWW for Wireless Links

Cambridge Open Mobile System

University of Cambridge Computer Laboratory