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An Analysis of Active End-to-end Bandwidth Measurement Methods in Wireless Networks
Mälardalen University, Department of Computer Science and Electronics.
Mälardalen University, Department of Computer Science and Electronics.ORCID iD: 0000-0002-2419-2735
Mälardalen University, Department of Computer Science and Electronics.
2006 (English)In: E2EMON 06: 4th IEEE/IFIP Workshop on End-to-End Monitoring Techniques and Services: REAL-TIME MONITORING OF INTERNET PATHS, 2006, 75-82 p.Conference paper, Published paper (Other academic)
Abstract [en]

For active, probing-based bandwidth measurements performed on top of the unifying IP layer, it may seem reasonable to expect the measurement problem in wireless networks to be no different than the one in wired networks. However, in networks with 802.11 wireless bottleneck links we show that this is not the case. The results from the experiments presented in this paper show that the measured available bandwidth is dependent on the probe packet size (contrary to what is observed in wired networks). Another equally important finding is that the measured link capacity, using the well known TOPP model, is dependent on the probe packet size and on the cross-traffic intensity. The underlying reasons for the observed differences are analyzed by incorporating the characteristics of 802.11 wireless networks into the TOPP model. The extended model is applicable to other end-to-end bandwidth measurement methods as well, such as BART, Pathload and PTR.

Place, publisher, year, edition, pages
2006. 75-82 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-4072DOI: 10.1109/E2EMON.2006.1651282ISI: 000238288300010ISBN: 978-142440145-1 (print)OAI: oai:DiVA.org:mdh-4072DiVA: diva2:120637
Conference
4th IEEE/IFIP Workshop on End-to-End Monitoring Techniques and Services, E2EMON; Vancouver; 3 April 2006 through 3 April 2006;
Available from: 2007-03-16 Created: 2007-03-16 Last updated: 2013-12-03Bibliographically 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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Publisher's full texthttp://www.idt.mdh.se/~ajn12/research/papers/aj_e2emon06.pdf

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