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Probe-based Admission Control for a Differentiated-Services Internet
KTH, School of Electrical Engineering (EES), Communication Networks.
KTH, School of Electrical Engineering (EES), Communication Networks.ORCID iD: 0000-0002-3704-1338
2007 (English)In: Computer Networks, ISSN 1389-1286, E-ISSN 1872-7069, Vol. 51, no 13, 3902-3918 p.Article in journal (Refereed) Published
Abstract [en]

End-point admission control solutions have been proposed to meet quality requirements of audio-visual applications with little support from routers. These proposals decentralize the admission decision by requiring each host or access gateway to probe the network before sending data. In this paper we describe a probe-based admission control scheme that offers a reliable upper bound on packet loss, as well as small end-to-end delay and delay jitter. The admission control supports host mobility and multicast communications without adding any complexity to the network nodes. We present a mathematical analysis which relates system performance to design parameters and which can be used as a dimensioning aid for the system. Finally, we describe performance results from an experimental prototype as well as simulations that prove that the scheme provides a reliable and efficient solution for QoS provisioning for delay and loss sensitive applications.

Place, publisher, year, edition, pages
2007. Vol. 51, no 13, 3902-3918 p.
Keyword [en]
Admission control; DiffServ; QoS
National Category
URN: urn:nbn:se:kth:diva-8725DOI: 10.1016/j.comnet.2007.04.009ISI: 000248748500013ScopusID: 2-s2.0-34447276676OAI: diva2:14123
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.
Trita-EE, ISSN 1653-5146 ; 2008:026
Admission control; QoS; IP networks
National Category
urn:nbn:se:kth:diva-4818 (URN)978-91-7415-012-4 (ISBN)
Public defence
2008-06-13, KTH, 13:15
QC 20100826Available from: 2008-06-10 Created: 2008-06-10 Last updated: 2010-08-26Bibliographically approved

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