WBest: A Bandwidth Estimation Tool for IEEE 802.11 Wireless Networks

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Executive Summary

Bandwidth estimation techniques seek to provide an accurate estimation of available bandwidth such that network applications can adjust their behavior accordingly. However, most current techniques were designed for wired networks and produce relatively inaccurate results and long convergence times on wireless networks where capacity can vary dramatically. This paper presents a new Wireless Bandwidth estimation tool, WBest, designed for fast, non-intrusive, accurate estimation of available bandwidth in IEEE 802.11 networks. WBest is a twostage algorithm: a packet pair technique estimates the effective capacity over a flow path where the last hop is a wireless LAN (WLAN); and a packet train technique estimates achievable throughput to infer the available bandwidth.

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