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Models for quality of service in heterogenoeous networks
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Both streaming techniques and wireless heterogeneous networks have recently become more widely deployed. As the current streaming techniques are primarily designed for homogenous wired networks, streaming multimedia applications in heterogeneous networks can perform poorly due to wireless networks conditions and vertical handover. These problems can significantly degrade the performance of streaming multimedia applications. Effects of the degradation are delay, jitter and packet loss resulting in lower multimedia quality. The use of some congestion recovery algorithms are detrimental factors to QoS. One approach used to control congestion in the network layer is Active Queue Management (AQM). This dissertation presents an evaluation and comparison of AQM mechanisms in heterogeneous networks. Based of the results of this research a new AQM algorithm, named the Adaptive AQM (AAQM) is proposed. The AAQM uses control law and link utilization in order to manage congestion. The action of the control law is to mark incoming packets in order to maintain the quotient between arriving and departing packets as low as possible. The AAQM enhances performance with respect to the queue length and packet loss as well as buffer space requirements. AAQM outperforms the other AQM algorithms in terms of multimedia packet loss and buffer delay.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet , 2007. , p. 41
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 24
National Category
Computer Sciences
Identifiers
URN: urn:nbn:se:miun:diva-9331ISBN: 978-91-85317-57-8 (print)OAI: oai:DiVA.org:miun-9331DiVA, id: diva2:227253
Presentation
(English)
Available from: 2009-07-10 Created: 2009-07-10 Last updated: 2018-01-13Bibliographically approved
List of papers
1. Conceptual Architecture for QoS in Heterogeneous Network
Open this publication in new window or tab >>Conceptual Architecture for QoS in Heterogeneous Network
2002 (English)In: Proceedings 4rd CARNet Users Conference, Zagreb: CARNet and Ministry of Science , 2002Conference paper, Published paper (Refereed)
Abstract [en]

The proliferation of wireless and mobile computing and networking that creates the bases for global nomadicity, which is the ability to communicate from everywhere to anywhere by everyone, has experienced exponential growth. The advent of mobile-centric and wireless devices and the need to preserve and apply the ubiquitous Internet technology, which was originally conceived when mobility was not an issue, has posited the need to create augmented and modified models of communication that attempt to preserve the semantic integrity and transparency independent of the underlying communication infrastructure. Moreover, the number, the power and the richness of the applications developed for mobile and wireless products include multimedia capabilities whose proper execution depends on the essential network attributes such as bandwidth, delay and reliability. These attributes are also the components of the Quality of Service (QoS). Some of the problems in a heterogeneous wireless networks that either directly or indirectly influence the QoS are well known. These include but are not limited to reliable transport services, where reliability due to the infrastructure might prove to be liability rather then an asset, then asymmetrical nature of the traffic, and finally the problem of handoffs. These problems have been one of the principal areas of research in communication networks in the last several years. In the paper, that is a report on an ongoing research, we propose an architecture that addresses the problems of the Internet technology deployment in wireless heterogeneous networks through a unified conceptual model. The diversity of this model and the basic architectural components, once sufficiently explored and well defined, should enable to achieve a desirable QoS for 4G networking.

Place, publisher, year, edition, pages
Zagreb: CARNet and Ministry of Science, 2002
Keywords
Conceptual model, quality of service, heterogeneous networks
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-2260 (URN)1459 (Local ID)953-6802-06-6 (ISBN)1459 (Archive number)1459 (OAI)
Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2018-01-12Bibliographically approved
2. Modeling and Verification of the Snoop Protocol
Open this publication in new window or tab >>Modeling and Verification of the Snoop Protocol
2003 (English)Report (Other scientific)
Abstract [en]

One of the main objectives of the original TCP protocol is a reliable transport over wired networks. In this case the random loss of data usually occurs due to phenomena of congestion. A similar assumption is not always true in wireless networks, where the medium itself is rather prone to errors. This leads to an impaired TCP performance, a fairly undesirable behavior since it is a premier transport protocol based on the omnipresence in networking of the TCP/IP technology. Hence, various modifications ands extensions have been proposed to improve TCP performance over heterogeneous networks (aggregations of wireline and wireless links). The strategies and the mechanisms that reflect these modifications widely vary and are of different nature. The intention of the article is neither to enumerate nor to analyze the pros and cons of the these strategies, but to produce a formal model using a modeling language such as PROMELA and verify it later with SPIN, of a popular and well-known TCP modification termed as Snoop.

Keywords
Modeling and Verification TCP
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-4225 (URN)4958 (Local ID)4958 (Archive number)4958 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-01-12Bibliographically approved
3. Adaptive, Active Queue Management in Heterogeneous Networks
Open this publication in new window or tab >>Adaptive, Active Queue Management in Heterogeneous Networks
2004 (English)In: ITI 2004: PROCEEDINGS OF THE 26TH INTERNATIONAL CONFERENCE ON INFORMATION TECHNOLOGY INTERFACES, UNIV ZAGREB, FACULTY MECHANICAL ENGINEERING & NAVAL ARCHITECTURE , 2004, p. 633-636Conference paper, Published paper (Refereed)
Abstract [en]

Queue management and congestion control are important to the robustness and fairness of the Internet. So far, the Active Queue Management (AQM) algorithms show weaknesses to detect and control congestion under dynamically changing network topology. In this paper a new AQM algorithm, termed as an Adaptive AQM (AAQM) is proposed to improve on both fairness and congestion control in heterogeneous networks. The performance of AAQM is compared to those ones of Blue, Drop-tail, RED and REM. The results of the simulations show that AAQM is very promising with respect to responsiveness and robustness in time-varying networks.

Place, publisher, year, edition, pages
UNIV ZAGREB, FACULTY MECHANICAL ENGINEERING & NAVAL ARCHITECTURE, 2004
Keywords
AQM, heterogeneous networks, throughput
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-3346 (URN)000224384500097 ()3729 (Local ID)953-96769-9-1 (ISBN)3729 (Archive number)3729 (OAI)
Conference
26th International Conference on Information Technology Interfaces, Jun 07-10, 2004, Cavtat, Croatia
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-01-12Bibliographically approved
4. An active queue management algorithm for congestion detection and control in dynamic network topologies
Open this publication in new window or tab >>An active queue management algorithm for congestion detection and control in dynamic network topologies
2004 (English)In: 8TH WORLD MULTI-CONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS, VOL XI, PROCEEDINGS - CONTROL, COMMUNICATION AND NETWORK SYSTEMS, TECHNOLOGIES AND APPLICATIONS: Vol. 1 / [ed] Callaos, N; Chang, RS; Lo, YK; ElBadawy, ESA, Zagreb: SRCE University Computing Centre , 2004, p. 263-267Conference paper, Published paper (Refereed)
Abstract [en]

One of the main objectives of Active Queue Management (AQM) mechanisms is to provide low delay and low packet loss in best-effort service networks. Nevertheless, AQM algorithms exhibit some weaknesses in the process of congestion detection and congestion whenever we have a dynamic network topology. The paper proposes a new AQM algorithm termed as Adaptive AQM (AAQM) to attain both fairness and congestion control in heterogeneous networks. The performance of AAQM is compared to Blue, Drop-tail, RED and REM using both Reno and Vegas version of TCP. The results based on a large series of simulations with ns (network simulator) indicate that AAQM using Reno is more robust, which means that it is highly responsive to the time-varying state of the network.

Place, publisher, year, edition, pages
Zagreb: SRCE University Computing Centre, 2004
Keywords
Dynamic network technologies, AQM, congestion, lossy links, control
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-3347 (URN)10.1109/ITI.2004.242577 (DOI)000227689600051 ()3730 (Local ID)953-96769-9-1 (ISBN)980-6560-13-2 (ISBN)3730 (Archive number)3730 (OAI)
Conference
8th World Multi-Conference on Systemics, Cybernetics and Informatics, Jul 18-21, 2004, Orlando, FL
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-01-12Bibliographically approved
5. Stability Analysis of Active Queue Management Algorithms in Input and Output Queued Switches in Heterogeneous Networks
Open this publication in new window or tab >>Stability Analysis of Active Queue Management Algorithms in Input and Output Queued Switches in Heterogeneous Networks
2005 (English)In: Proceedings of the International Conference on Information Technology Interfaces, ITI, IEEE conference proceedings, 2005, p. 579-584, article id 1491187Conference paper, Published paper (Refereed)
Abstract [en]

The focus of the paper is the implementation of a class of active queue management algorithms (AQM). Their measure of congestion includes packet arrival rate such as REM and Adaptive AQM (AAQM) with respect to a combined input and output queued (CIOQ) switch. The selection of parameters for the congestion controllers at the sources and the AQM scheme at the links prove to be essential for ensuring stability. A structure with one AQM per output port is proposed and consequently followed by the analysis of the constraints on the switch fabric speed imposed by it. A three queue model of a CIOQ switch is developed and simulated to validate the design and compare its performance with a RED queue switch.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2005
Keywords
Active Queue Management (AQM), Input and Output Switches (IOQS), Heterogeneous Network
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-3211 (URN)10.1109/ITI.2005.1491187 (DOI)000234448300089 ()2-s2.0-33745269174 (Scopus ID)3255 (Local ID)953-7138-02-X (ISBN)3255 (Archive number)3255 (OAI)
Conference
27th International Conference on Information Technology Interfaces, ITI 2005; Cavtat; Croatia; 20 June 2005 through 23 June 2005
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2018-01-12Bibliographically approved
6. Active Queue Management for TCP Friendly Rate Control Traffic in Heterogeneous Networks
Open this publication in new window or tab >>Active Queue Management for TCP Friendly Rate Control Traffic in Heterogeneous Networks
2008 (English)In: 2008 International Conference on Telecommunications, ICT, New York: IEEE conference proceedings, 2008, article id 4652662Conference paper, Published paper (Refereed)
Abstract [en]

This paper studied the performance of the small-packet variant of the TCP Friendly Rate Control protocol in heterogeneous networks. The objective is to maximize system utilization, often called goodput, while maintaining fairness between the nodes. We show that by selecting the right queue size policy, it can be ensured that the bandwidth is fully utilized at a steady state. Additionally, we show that the judicious use of such a policy is beneficial for heterogeneous networks with high packet drop rates.

Place, publisher, year, edition, pages
New York: IEEE conference proceedings, 2008
Keywords
AQM, TFRC & DCCP
National Category
Computer Sciences
Identifiers
urn:nbn:se:miun:diva-4033 (URN)10.1109/ICTEL.2008.4652662 (DOI)000262437800052 ()2-s2.0-67650218233 (Scopus ID)4961 (Local ID)978-1-4244-2035-3 (ISBN)4961 (Archive number)4961 (OAI)
Conference
2008 International Conference on Telecommunications, ICT; St. Petersburg; Russian Federation; 16 June 2008 through 19 June 2008; Category number08EX2191; Code 77440
Available from: 2008-09-30 Created: 2009-07-24 Last updated: 2018-01-12Bibliographically approved

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Rahmani, Rahim

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