Tutorials
Prof. Paulo Marques |
Prof. Pascal Lorenz |
Cognitive radios in TV white spaces: a great opportunity for mobile multimedia communications |
IP-Oriented QoS in the Next Generation Networks: application to wireless networks |
Abstract The complete transition from analogue to the digital TV is planned in Europe for 2012. After analogue switch off the spectrum 790 MHz to 862 MHz (TV channels 61 to 69), the so called digital dividend, will be/was entirely cleared from broadcast. Within the remaining spectrum (470 MHz to 790 MHz) not all channels are occupied at each location. These locally unused channels are called TV White Spaces (TVWS). TVWS provides a “once in a lifetime” opportunity for the development of innovative multimedia services and the introduction of new cognitive radio technologies into the UHF bands. However, despite the grand words about opening up a new band to support low cost, ubiquitous access and innovative new providers, there are many obstacles to TVWS systems. The creation of workable systems that clearly demonstrates and prove that no harmful interference is caused to broadcasters (DVB) or other licensed systems is one of those challenges, as is the completion of standards.
In this context, the tutorial will address the following topics: 1-Global perspective of the digital switchover 2-The economic potential and impact on multimedia services 3-Main technical challenges and possible approaches 4-The regulatory framework for the use of cognitive TVWS systems in Europe 5-Ongoing standardization efforts on the cognitive use of TVWS |
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Abstract Emerging Internet Quality of Service (QoS) mechanisms are expected to enable wide spread use of real time services such as VoIP and videoconferencing. The "best effort" Internet delivery cannot be used for the new multimedia applications. New technologies and new standards are necessary to offer Quality of Service (QoS) for these multimedia applications. Therefore new communication architectures integrate mechanisms allowing guaranteed QoS services as well as high rate communications.
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