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On measuring the available bandwidth in wireless 802.11b networks
Mälardalen University, Department of Computer Science and Electronics.
(English)Manuscript (Other academic)
National Category
Computer Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-4075OAI: oai:DiVA.org:mdh-4075DiVA: diva2:120640
Available from: 2007-03-16 Created: 2007-03-16 Last updated: 2015-09-15Bibliographically approved
In thesis
1. Modeling, Implementation and Evaluation of IP Network Bandwidth Measurement Methods
Open this publication in new window or tab >>Modeling, Implementation and Evaluation of IP Network Bandwidth Measurement Methods
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Internet has gained much popularity among the public since the mid 1990's and is now an integrated part of our society. A large range of high-speedbroadband providers and the development of new and more efficient Internet applications increase the possibilities to watch movies and live TV, use IP-telephony and share files over the Internet. Such applications demand high data transmission rates, which in turn consume network bandwidth. Since several users must share the common bandwidth capacity on the Internet, there will be locations in the network where the demand is higher than the capacity. This causes network congestion, which has negative impact on both the data transmission rate and transmission quality.

This thesis is about methods for measuring the available bandwidth of a network path between two computers. The available bandwidth can be interpreted as the maximum transfer rate possible without causing congestion. By deploying the methods studied in this thesis the available bandwidth can be measured without previous knowledge of the network topology. When an estimate of the available bandwidth is obtained, the transfer rate when sending messages between computers can be set to the measured value in order to avoid congestion.

In the thesis an active end-to-end available bandwidth measurement method called "Bandwidth Available in Real Time" (BART for short) is evaluated. BART measures the available bandwidth by injecting probe packets into the network at a given rate and then analysing how this rate has changed on the receiving side. A Kalman filter is used to update the current estimate of the available bandwidth using the new measurement sample.

The focus of the thesis is on how methods, such as BART, function in wireless 802.11 networks, which are very popular in work as well as in home environments. Wireless networks have a different construction compared to many other types of networks and this can affect the accuracy of the measurement methods discussed in this thesis. The effects must be analyzed and understood in order to obtain accurate available bandwidth estimates. Since wireless links are often parts of the network path between a sender and a receiver on the Internet, it is important to study how these links affect the estimates of the available bandwidth.

Place, publisher, year, edition, pages
Institutionen för datavetenskap och elektronik, 2007. 170 p.
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 42
Keyword
Computer networks, Bandwidth measurement, Wireless networks
National Category
Computer Science
Research subject
Datavetenskap
Identifiers
urn:nbn:se:mdh:diva-195 (URN)978-91-85485-41-3 (ISBN)
Public defence
2007-04-27, Gamma, U, Rosenhill, Västerås, 13:15
Opponent
Supervisors
Available from: 2007-03-16 Created: 2007-03-16

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http://www.idt.mdh.se/~ajn12/research/papers/aj_submitted_e2emon07.pdf

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