A Proxy Architecture to Enhance the Performance of WAP 2.0 by Data Compression
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A Proxy Architecture to Enhance the Performance of WAP 2.0 by Data Compression Zhanping Yin Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada V6T 1Z4 Email: [email protected]
Victor C. M. Leung Department of Electrical and Computer Engineering, The University of British Columbia, Vancouver, BC, Canada V6T 1Z4 Email: [email protected] Received 11 June 2004; Revised 17 November 2004; Recommended for Publication by Weihua Zhuang This paper presents a novel proxy architecture for wireless application protocol (WAP) 2.0 employing an advanced data compression scheme. Though optional in WAP 2.0, a proxy can isolate the wireless from the wired domain to prevent error propagations and to eliminate wireless session delays (WSD) by enabling long-lived connections between the proxy and wireless terminals. The proposed data compression scheme combines content compression together with robust header compression (ROHC), which minimizes the air-interface traffic data, thus significantly reduces the wireless access time. By using the content compression at the transport layer, it also enables TLS tunneling, which overcomes the end-to-end security problem in WAP 1.x. Performance evaluations show that while WAP 1.x is optimized for narrowband wireless channels, WAP 2.0 utilizing TCP/IP outperforms WAP 1.x over wideband wireless channels even without compression. The proposed data compression scheme reduces the wireless access time of WAP 2.0 by over 45% in CDMA2000 1XRTT channels, and in low-speed IS-95 channels, substantially reduces access time to give comparable performance to WAP 1.x. The performance enhancement is mainly contributed by the reply content compression, with ROHC offering further enhancements. Keywords and phrases: wireless networks, wireless application protocol, wireless proxy.
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INTRODUCTION
Wireless Internet access is an emerging service that is considered central to the commercial success of the next-generation cellular networks. The wireless application protocol (WAP) is the convergence of three rapidly evolving network technologies: wireless data, telephony, and the Internet. It is the de facto world standard for the presentation and delivery of wireless information services on mobile phones and other wireless terminals. WAP is a result of continuous work to define an industry-wide specification for developing applications that operate over wireless communication networks [1]. The WAP specifications address mobile network characteristics and operator needs by adapting existing network technology to the special requirements of mass-market, handheld wireless data devices and by introducing new technology where appropriate. This is an open-access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
WAP 1.x is a standard aimed at optimizing the performance of wireless Internet access under such limitations as low ba
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