Available Bandwidth Estimation in IEEE802.11b Network Based on Non-Intrusive Measurement

Authors:
Chen Chen;Changxing Pei;Liunai An
Affiliations:
Xidian University, Ministry of Education, China;Xidian University, China;Xidian University, China
Venue:
PDCAT '06 Proceedings of the Seventh International Conference on Parallel and Distributed Computing, Applications and Technologies
Year:
2006

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Abstract

In this paper,we present a non-intrusive and timebased mechanism to estimate the available bandwidth of a node with the nodes collision and backoff stage taken into account. We first give a new definition of available bandwidth in IEEE802.11b network to reflect the collision and contention between nodes.Then,the investigated node obtains the NAV information of its neighbors within the measurement duration through CSMA/CA mechanism and stores the information into its routing buffers.Subsequently,we obtain the available bandwidth of the investigated node by calculate the ratio of its channel accessible time to the measurement duration,which should subtract the sum of NAV values of its neighbors and the backoff time itself from the measurement duration.Simulation shows the proposed scheme is accurate and can completely reflect the collision and contention between nodes.