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Edge-based Differentiated Services
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
2005 (English)In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 3552, 259-270 p.Article in journal (Refereed) Published
Abstract [en]

Network quality of service is traditionally thought to be provided by a combination of scheduling in the network nodes to enforce a capacity sharing policy and traffic controls to prevent congestion that could annihilate that policy. The work presented herein is instead based on an end-to-end argument: A capacity sharing policy is enforced by traffic controls in the hosts at the edges of the network, without any scheduling support in the network. Our proposal is to add a feed-forward control at the transport layer to provide a service that is better suited to conversational and streaming applications than the batch-oriented transfer mode provided by TCP. The paper presents the control and its evaluation: We compare the sharing of capacity between traffic classes and study the loss rate seen by admitted streams. The outcome is that the new control adds a distinctly different service to the service offered by TCP for the Internet.

Place, publisher, year, edition, pages
2005. Vol. 3552, 259-270 p.
Keyword [en]
Congestion control (communication); Network protocols; Public policy; Telecommunication traffic; Differentiated services; End-to-end argument
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-8138ISI: 000230383200021Scopus ID: 2-s2.0-26444479632OAI: oai:DiVA.org:kth-8138DiVA: diva2:13382
Note
QC 20100826. Ingår i Proc. of 13th International Workshop on Qualityof Service - IWQoS 2005.Available from: 2005-10-26 Created: 2005-10-26 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Error and Traffic Control for High-Speed Networks
Open this publication in new window or tab >>Error and Traffic Control for High-Speed Networks
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The Internet evolves rapidly, both in terms of the applications that use it and the networks that carry the traffic. This creates many important research tasks, both to adapt the networks that carry the traffic to work well together with the Internet protocols and to make the protocols robust to tolerate various underlying networks. A key issue is error handling, in this thesis both error correction for both underlying optical networks and integrated in the Internet protocols are studied. The results show that error control should not be considered in isolation: by combining it with traffic control we find that it is possible to implement new services in elegant ways that are well suited for deployment in the Internet.

The traffic in the Internet is increasingly being carried over optical links which offer large capacity. When optical fibers are deployed in access networks, the components need to be cheap and an important factor is sharing of the fibers between several users. One technology that can help in providing these advantages is optical code division multiple access (CDMA). If low-complexity components are used, noise will be a significant problem and there is a need for error control to keep the error rates at an acceptable level. Error control for an optical CDMA network is one of the topics in this thesis. Our results show that there is a strong correlation between the error rates and the number of active users, which indicates the need for traffic control. Moreover, the performance is significantly improved by error correction and soft decoding.

In wireless networks, packet loss caused by transmission errors is a well-known problem. In particular for the transmission control protocol (TCP), the performance is severely degraded by losses that are not caused by congestion. In this thesis, end-to-end forward error correction (FEC) is considered as a solution. A further advantage of end-to-end FEC is that it can also improve TCP performance for large bandwidth-delay product paths, where TCP is also known to perform badly. The results show that the error control has to be designed with the requirements of the traffic control in mind.

The requirement on the network service is very different for a service like IP-telephony compared to web surfing; hence new traffic control methods are needed. For conversational applications it is important to have predictable performance during a session. For this purpose probe-based admission control can be used, but a problem with this approach is that it cannot isolate different applications with differing requirements on the loss rate. A solution is to combine the admission control with FEC to protect the ongoing sessions and provide consistent quality. Based on these ideas, a service architecture that can be deployed without upgrading the network is proposed and evaluated. The last part of this thesis also shows how this host based scheme could evolve into more complex schemes as network support is provided.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 36 p.
Series
Trita-S3-LCN, ISSN 1653-0837 ; 0511
Keyword
Telecommunication
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-468 (URN)
Public defence
2005-11-11, L1, KTH, Drottning Kristinas väg 30, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101019Available from: 2005-10-26 Created: 2005-10-26 Last updated: 2013-09-09Bibliographically approved
2. 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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