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Mobile Agent Approach to Congestion Control in Heterogeneous Networks
Stockholm University, Faculty of Social Sciences, Department of Computer and Systems Sciences.
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

One of the motivations to study the behavior of the Internet is to find out the best way to maintain the relative stability of the global network. This leads into the investigations of events that impair the performance of the system such as congestion that occurs whenever the demand for resources exceed the available capacity. When the congestion is left uncontrolled the performance of the whole system degrades through severe delays, lost packets, and even a complete shutdown of the network. Hence, congestion management through monitoring, detection and control is necessary in order to sustain acceptable levels of network performance and this may be done via the transport protocols. Consequently, many modifications of the original TCP protocol have been implemented to manage the control. On the other hand, unlike TCP, UDP has no knowledge of congestion whatsoever and hence unresponsive to the network problems.

The work explores the possibility to influence and modify the unresponsive behavior of UDP or similar protocols via the mobile agent paradigm. The autonomous entities are able to migrate across the network and sense the state of the network and when needed tame the intensity of UDP or alike flows to prevent congestion. The proposed model is termed the Combined Model for Congestion Control (CM4CC) and has two different objectives. The first one is to employ the host centric or end-to-end (E2E) congestion control mechanisms for the TCP flows; the second one is to invoke the mobile agent paradigm to manage the non-TCP (or UDP) traffic. Both mechanisms must work together to avoid congestion. When it eventually appears, they have to assist the network in speedy recovery and return to the normal mode of operation. The validity of the CM4CC has been verified through numerous simulation scenarios using the Optimized Network Engineering Tool (OPNET). The results provide the basis for an environment that makes possible the coexistence of responsive and unresponsive flows.

Place, publisher, year, edition, pages
Kista: Institutionen för data- och systemvetenskap (tills m KTH) , 2008. , 321 p.
Series
Report Series / Department of Computer & Systems Sciences, ISSN 1101-8526 ; No. 08-002
National Category
Information Science
Research subject
Computer and Systems Sciences
Identifiers
URN: urn:nbn:se:su:diva-7403ISBN: 978-91-7155-572-4 (print)OAI: oai:DiVA.org:su-7403DiVA: diva2:198209
Public defence
2008-03-28, sal B, Forum, Isafjordsgatan 39, Kista, 13:00
Opponent
Supervisors
Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
List of papers
1. Agent Paradigm in Computer Networks, Proceedings of 6th CARNet User Conference, Zagreb, Croatia, September 2004
Open this publication in new window or tab >>Agent Paradigm in Computer Networks, Proceedings of 6th CARNet User Conference, Zagreb, Croatia, September 2004
2004 In: Proceedings of 6th CARNet User Conference, Zagreb, Croatia, no SeptemberArticle in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24728 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
2. A Conceptual Model for Congestion Management of Internet Traffic Flows
Open this publication in new window or tab >>A Conceptual Model for Congestion Management of Internet Traffic Flows
2004 In: Proceedings of International Conference on Computing, Communication and Control Technologies (CCCT 2004), Austin, USA, Vol. 5, no August, 402-406 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24729 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
3. Combined Model for Congestion Control
Open this publication in new window or tab >>Combined Model for Congestion Control
In: Computing and Information Technology (CIT), ISSN 1330-1136, Vol. 14, no 4, 337-342 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24730 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
4. Combined Model for Congestion Control
Open this publication in new window or tab >>Combined Model for Congestion Control
2006 In: Proceedings of ITI 2006 - 28th International Conference Information Technology Interfaces, Cavtat/Dubrovnik, Croatia, no June, 657-662 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24731 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
5. Network Congestion Management and the Mobile Agent Paradigm Journal
Open this publication in new window or tab >>Network Congestion Management and the Mobile Agent Paradigm Journal
2006 In: Acta Electrotechnica et Informatica, ISSN 1335-8243, Vol. 6, no 1, 71-74 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24732 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
6. Extending the Combined Model for Congestion Control (CM4CC) to Heterogeneous Networks
Open this publication in new window or tab >>Extending the Combined Model for Congestion Control (CM4CC) to Heterogeneous Networks
2007 In: Proceedings of 29th International Conference: Information Technology Interfaces - ITI 2007, Cavtat/Dubrovnik, Croatia, no June, 723-727 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24733 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
7. Extending the OPNET Simulation Environment for Mobile Agents in Network Congestion Control
Open this publication in new window or tab >>Extending the OPNET Simulation Environment for Mobile Agents in Network Congestion Control
2007 In: Proceedings of 6th Congress on Modeling and Simulation - EuroSim 2007, Ljubljana, Slovenia, no SeptemberArticle in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24734 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved
8. Coexistence of Responsive and Unresponsive Flows in Heterogeneous Networks
Open this publication in new window or tab >>Coexistence of Responsive and Unresponsive Flows in Heterogeneous Networks
2007 In: Proceedings of the Third Balkan Conference in Informatics - BCI 2007, Sofia, Bulgaria, Vol. 1, no September, 115-130 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24735 (URN)
Note
Part of urn:nbn:se:su:diva-7403Available from: 2008-03-04 Created: 2008-03-04Bibliographically approved

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