by Analoui, Morteza; Jamali, Shahram

Congestion in the Internet is the main reason for reduced performance and poor quality of service; therefore, a good congestion control system is essential. The current work proposes that the congestion control problem in the Internet can be inspired from natural population control tactics. Toward this idea, the congestion window size of each connection is viewed as population size of a species and then congestion control problem is redefined as population control of these windows species (W). This paper defines a three-trophic food chain and gives a model to control population size of W species within this food chain. Simulation results show that the proposed algorithm leads to a fair, stable and high-performance congestion control scheme.

DOI: 10.1007/s10922-007-9093-6
Online Date: 12/29/2007
Print publication date: 3/1/2008
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by Magedanz, Thomas; Madeira, Edmundo; Bellavista, Paolo

DOI: 10.1007/s10922-007-9091-8
Online Date: 12/29/2007
Print publication date: 3/1/2008
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by Blum, Niklas; Jacak, Piotr; Schreiner, Florian; Vingarzan, Dragos; Weik, Peter

The IP Multimedia Subsystem (IMS), already widely recognized as a fundamental core component of Next Generation Networks (NGNs), enables proliferation of a huge variety of value added services. Simultaneous to the emergence of triple play services there is a strong need for establishing standardized methodologies for service fulfillment and assurance, maintaining service execution parameters at advertised levels. Traditional Operations Support Systems (OSS) are not adequate for managing NGNs. This work shows experiences gained from implementing OSS for NGNs. It describes a solution that combines extensive NGN development expertise with a new generation, of policy-based, service oriented OSS solutions in order to provide enhanced levels of automation and reliability to the NGN service delivery and session control environment. Primary focus of this approach is put on service assurance and service fulfillment mechanisms for remote monitoring, automated control and configuration of standard compliant IMS infrastructures, such as the Open Source IMS Core (OSIMS) based Open IMS Playground. This work describes state of the art NGN OSS design principles and knowledge attained by integration of standardized fault management as well as service and subscriber provisioning procedures showing how the full cycle from service deployment to service advertisement to service execution can be delivered in an automated way.

DOI: 10.1007/s10922-007-9094-5
Online Date: 12/22/2007
Print publication date: 3/1/2008
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by Kuriyama, Hiroshi; Lee, Kyung-Hyu; Kuo, G. S.; Ata, Shingo; Hong, Choong Seon

This article presents a report on APNOMS 2007, which was held October 10–12, 2007 in Sapporo, Japan. The theme of APNOMS 2007 was “Managing the Next Generation Networks and Services.”

DOI: 10.1007/s10922-007-9089-2
Online Date: 12/20/2007
Print publication date: 3/1/2008
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by Doolin, Kevin; Mullins, Robert; Abad, Rafael Morón; Moreno, Marta García; Mota, Telma; Farshchian, Babak A.; Gómez, Miguel

Natural communication among people happens in flexible ways and is strongly affected by the users’ situation (such as communication tools available, user’s location, and user’s preferences). This situation or context information is seldom used to initiate communication sessions among users. Current communication systems are indifferent about users’ context, often require time consuming manual configurations and often result in conferencing tools not being easily accessible when needed. This leads to lower adoption of innovative communications services. IMS SIP (IP Multimedia Subsystem, Session Initiation Protocol) sessions allow users to access the session from different points of contact (home, office, etc.), however, IMS still requires a prior knowledge of all SIP components that might be used in a SIP session. Furthermore, IMS makes limited use of context information (mainly user-defined availability). To address these issues our research approach combines techniques from pervasive computing with IMS networking principles to facilitate compositions of communication sessions based on users’ context. We propose a platform and APIs for pervasive application development support to allow greater intelligence in IMS applications. We additionally provide mechanisms for IMS applications to apply their intelligence to the configuration of physical devices and web resources used to set up a conference. The innovations proposed in this paper are: (1) A new standard for intelligent IMS-based conferencing applications. (2) Application Development Interfaces (APIs) for a platform for pervasive computing. (3) An architecture for a pervasive IMS platform.

DOI: 10.1007/s10922-007-9090-9
Online Date: 12/19/2007
Print publication date: 3/1/2008
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by Souza, José Neuman; Schulze, Bruno; Sauvé, Jacques Philippe; Madeira, Edmundo; Ziviani, Artur

DOI: 10.1007/s10922-007-9088-3
Online Date: 12/19/2007
Print publication date: 3/1/2008
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