The proliferation of new services and applications have led to an unprecedented growth in mobile communications on a global scale, and market trends are heading towards the cost-effective delivery of broadband multimedia services at anytime and at anyplace. This will pose new challenges in service delivery, wireless network design, interoperability and optimization. To fulfil these ambitious goals will require innovative solutions in terms of novel network architectures based on cross-layer design, protocols and traffic-related mechanisms, whilst network planning will need to be readdressed.

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The implementation of these unified ways of looking at system design, optimisation, and QoS issues to satisfy the requirements of next generation multi-service mobile and wireless IP-based networks requires the development of IP QoS architectures and mechanisms encompassing the various layers of the OSI Model to cope with the new requirements. The basic idea to be pursued in this project is that QoS provision in wireless networks, will require the joint collaboration among physical, MAC, IP and transport layers; how it may be done, and new definitions of cross-layer protocols are thus important areas for collaborative studying and research.

As these multimedia communications systems will be wide- and broadband (with data rates much higher than 3G ones), multi-service, and multi-rate ones, the QoS provision for each service (within different traffic classes), and the identification of suitable schemes to guarantee high capacity in these heterogeneous environments are also of particular concern in this project.

To achieve the challenging goals laid out by B3G vision, the CROSSNET project proposes to answer these by targeting three key scenarios:
__ Traffic modelling and QoS, where traffic models appropriate to characterise the different classes of services envisioned for B3G systems are studied. Characterisation parameters and traffic models that accounts for multi-rate applications will be used as an input of the design and optimisation process.
__ MAC definition and cross-layer design, where the use of the traffic model results, and proposals for architectures using cross-layer information (CLI) to achieve QoS are investigated and assessed. Research work will include the identification and transport of relevant cross-layer information (CLI), the definition of a cross-layer (CL) architecture framework, and Cross-layer strategies between PHY and MAC/RRM.
__ Network planning and optimisation, which represents the synthesis and integration of the two previous activities by means of performance evaluation (including simulation). Multi-service deployment scenarios, with simultaneous support of multi-rate multimedia applications, provides a framework for possible operation environments. Traffic engineering aspects related to the measurement, modelling, and control of multimedia multi-class traffic (e.g., related with mobile IP and micro-mobility issues) will also be addressed, as well as novel packet-switched QoS architectures aspects, and their performance. The impact of economic in systems optimisation will also be addressed.

Our methodology will be based both in modelling and simulation work but network traffic measurements will also being performed.

Finally, it is important to highlight that this research programme is challenging for both IT teams (Covilhã and Aveiro), and does constitute an innovative area of research that will strongly contribute to “all-IP” mobile and wireless communications research for B3G systems within Europe.

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Instituto de Telecomunicações > DEM > Universidade da Beira Interior > Calçada Fonte do Lameiro - Edifício das Engenharias - 6201-001 Covilhã <
> Tel: 275329919 / 53 - e-mail: fjv@ubi.pt <

 
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