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Theoretical and Experimental Analysis of the Channel Busy Fraction in IEEE 802.11
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (Computer Science)
Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. (DISCO)ORCID iD: 0000-0002-9446-8143
2010 (English)In: Proceedings of Future Network & Mobile Summit 2010, IEEE , 2010, p. 1-9Conference paper, Published paper (Refereed)
Abstract [en]

Optimizing the operation of IEEE 802.11 networks requires to estimate the load of the wireless channel. The channel busy fraction, which is the fraction of time in which the wireless channel is sensed busy due to successful or unsuccessful transmissions, can be used as such indicator. It can be obtained from e.g. the IEEE 802.11k channel load report or hardware-specific interfaces. Previously, the channel busy fraction has been used as a metric for different purposes such as routing and admission control. However, a thorough evaluation of the relationship between the busy fraction and other important characteristics such as the collision probability and throughput is missing. In this paper, we present an analytical model to study the channel busy fraction in non-saturated IEEE 802.11 networks. We validate the model with measurements in a testbed. The predictions from the model match measurements well. Furthermore, we demonstrate how to apply the model to estimate the available link bandwidth. Using measurements obtained from a testbed operated at 6 Mbit/s, we show that the channel busy fraction allows an accurate prediction of the available bandwidth with an error smaller than 70 Kbit/s.

Place, publisher, year, edition, pages
IEEE , 2010. p. 1-9
Keywords [en]
Analytical models, Channel estimation, IEEE 802.11 Standards, Load modeling, Measurement, Throughput, Wireless sensor networks
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:kau:diva-6442ISBN: 978-1-905824-16-8 (print)OAI: oai:DiVA.org:kau-6442DiVA, id: diva2:354588
Conference
Future Network & Mobile Summit 2010, Florence, Italy, June 2010
Available from: 2010-10-04 Created: 2010-10-04 Last updated: 2018-01-12Bibliographically approved
In thesis
1. Cross-Layer Optimization of Voice over IP in Wireless Mesh Networks
Open this publication in new window or tab >>Cross-Layer Optimization of Voice over IP in Wireless Mesh Networks
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Wireless Mesh Networks (WMNs) have emerged as a promising network technology, which combines the benefits of cellular networks and Wireless Local Area Networks (WLANs). In a WMN mesh routers wirelessly relay traffic on behalf of other mesh routers or clients and thereby provide coverage areas comparable to cellular networks, while having the low complexity and low costs of WLANs. As Voice over IP (VoIP) is a very important Internet service, it is critical for the success of WMNs to support high quality VoIP. However, currentWMNs are not adapted well for VoIP. The capacity and scalability of single-radio WMNs is low, especially for small packet transmissions of VoIP calls, because the MAC and PHY layer overhead for small packets is high. The scalability of multiradio/multi-channel WMNs is usually higher, since fewer nodes contend for a channel. However channel scheduling might be required, which can lead to excessive delay and jitter and result in poor VoIP quality. In this thesis we investigate how to deliver high quality VoIP in single radio and multi-radio networks by using cross-layer optimization. For single radio WMNs, we consider the use of IP packet aggregation and IEEE 802.11e transmission opportunities. We conclude that IP packet aggregation greatly improves the capacity and thereby the scalability of WMNs. We show that the key for providing good quality is to artificially delay packets prior to aggregation. We propose a distributed cross-layer optimization system, which, based on Fuzzy Logic Inference, derives an aggregation delay that enhances the capacity and quality. For multi-radio/multi-channel WMNs, we demonstrate the importance of qualityof- service-aware channel scheduling. We develop a quality-of-serviceaware channel scheduler that compared to a basic round-robin scheme significantly reduces jitter and in that way increases VoIP quality. Our analysis shows that there is a trade-off between the jitter of high priority VoIP traffic and the throughput of background TCP traffic. The proposed optimizations significantly increase the capacity of singleradio and multi-radio WMNs. This allows network operators to serve more users with an existing mesh infrastructure or provide better service delivery to existing users.

Place, publisher, year, edition, pages
Karlstad: Karlstad University, 2010. p. 33
Series
Karlstad University Studies, ISSN 1403-8099 ; 2010:25
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-6280 (URN)978-91-7063-309-6  (ISBN)
Presentation
2010-10-25, 21A 342, Karlstads universitet, Karlstad, 10:00 (English)
Opponent
Supervisors
Available from: 2010-10-08 Created: 2010-08-26 Last updated: 2018-01-12Bibliographically approved

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