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Overload Protection for IEEE 802.11 Cells
KTH, School of Electrical Engineering (EES), Communication Networks.
KTH, School of Electrical Engineering (EES), Communication Networks.
KTH, School of Electrical Engineering (EES), Communication Networks.ORCID iD: 0000-0002-3704-1338
2006 (English)In: 2006 14th IEEE International Workshop on Quality of Service, IWQoS 2006, 2006, 149-158 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a distributed admission control for the distributed coordination function of IEEE 802.11 wireless LANs that limits the risk of congestion collapse due to a high arrival rate of flows. This control scheme requires no modification to the current distributed coordination function; it works by performing a short, non-disturbing probe that estimates the MAC service time. The flow is admitted if the estimate is below a threshold. We show how the threshold may be adjusted dynamically to maintain an average packet loss rate below a configurable limit. We show via extensive simulations that the admission control avoids congestion due to flow arrivals and that it maintains the loss probability below the given threshold regardless of the offered load or number of stations. Our simulations also analyze the main drawback of our scheme: a reduction in the link utilization. The admission control efficiently protects cells from overload and it may offer soft QoS guarantees to multimedia flows without the need for scheduling or-polling mechanisms in IEEE 802.11.

Place, publisher, year, edition, pages
2006. 149-158 p.
Series
International Workshop on Quality of Service, ISSN 1548-615X
Keyword [en]
802.11 MAC service time; Admission control; Probing, overload protection; Wireless LAN
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-8727DOI: 10.1109/IWQOS.2006.250462ISI: 000240904300016Scopus ID: 2-s2.0-34250632253ISBN: 1-4244-0476-2 (print)OAI: oai:DiVA.org:kth-8727DiVA: diva2:14125
Note
QC 20100826Available from: 2008-06-10 Created: 2008-06-10 Last updated: 2013-09-09Bibliographically approved
In thesis
1. On Admission Control for IP Networks Based on Probing
Open this publication in new window or tab >>On Admission Control for IP Networks Based on Probing
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The current Internet design is based on a best-effort service, which combines high utilization of network resources with architectural simplicity. As a consequence of this design, the Internet is unable to provide guaranteed or predictable quality of service (QoS) to real-time services that have constraints on end-to-end delay, delay jitter and packet loss.

To add QoS capabilities to the present Internet, the new functions need to be simple to implement, while allowing high network utilization. In recent years, different methods have been investigated to provide the required QoS. Most of these methods include some form of admission control so that new flows are only admitted to the network if the admission does not decrease the quality of connections that are already in progress below some defined level. To achieve the required simplicity a new family of admission control methods, called end-to-end measurement-based admission control moves the admission decision to the edges of the network.

This thesis presents a set of methods for admission control based on measurements of packet loss. The thesis studies how to deploy admission control in an incremental way: First, admission control is included in the audiovisual real-time applications, without any support from the network. Second, admission control is enabled at the transport layer to differentiate between elastic and inelastic flows, by embedding the probing mechanism in UDP and using the inherent congestion control of TCP. Finally, admission control is deployed at the network layer by providing differentiated scheduling in the network for probe and data packets, which then allows the operator to control the blocking probability for the inelastic flows and the average throughput for the elastic flows.

The thesis offers a description of the incremental steps to provide QoS on a DiffServ-based Internet. It analyzes the proposed schemes and provides extensive figures of performance based on simulations and on real implementations. It also shows how the admission control can be used in multicast sessions by making the admission decision at the receiver.

The thesis provides as well two different mathematical analyses of the network layer admission control, which enable operators to obtain initial configuration parameters for the admission decision, like queue sizes, based on the forecasted or measured traffic volume.

The thesis ends by considering a new method for overload control in WLAN cells, closely based on the ideas for admission control presented in the rest of the articles.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. v, 37 p.
Series
Trita-EE, ISSN 1653-5146 ; 2008:026
Keyword
Admission control; QoS; IP networks
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-4818 (URN)978-91-7415-012-4 (ISBN)
Public defence
2008-06-13, KTH, 13:15
Opponent
Supervisors
Note
QC 20100826Available from: 2008-06-10 Created: 2008-06-10 Last updated: 2010-08-26Bibliographically approved

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Karlsson, Gunnar

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