Th`ese de Doctorat de l'université Paris VI Pierre et Marie Curie Mlle ...

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per-flow bandwidth guarantee and then exploits the unused bandwidth individuated peri- odically in the network to propose short-term guaranteed extra-bandwidth to users who are willing to pay more to get a higher bandwidth. To implement our service model, we introduced a distributed dynamic resource provisioning architecture for quality of service networks and a set of control messages to provide interactions between network elements. In Chapter 4, we presented a precise statement of the bandwidth allocation problem, then we provided a utility-based definition of the network extra-revenue and finally we performed a connections classification based on traffic statistics gathered at ingress routers. In Chapter 5, we proposed a broad set of heuristic dynamic bandwidth allocation algorithms tailored to our proposed service model, with increasing complexity and performance. In Chapter 6, we introduced a novel mathematical model that assumes the exact knowl- edge of the future traffic offered to the network and extends the well known utility max- imization problem studied in [7] to include connections arrival-times and durations. Our model allows to provide bounds to the performance achievable by any online dynamic bandwidth allocation algorithm. Simulation results in Chapter 7 measured in realistic network scenarios showed that our allocation algorithms and service model allow to increase both resource utilization and network revenue with respect to static provisioning techniques. Further, in Chapter 8, we compared the performance of our bandwidth allocation algorithms to the bounds provided by the mathematical model. We have shown that these algorithms allow to increase consistently network revenue with respect to static provisioning schemes and approach, in several network scenarios, the upper bound provided by the mathematical model. 9.2 Future Research Issues In this thesis we have addressed the problem of dynamic bandwidth allocation considering a fixed routing strategy. We have assumed that each communication between a user pair is 84
established by creating a session involving a path that remains fixed throughout the user pair conversation duration. The session path choice method (i.e., the routing algorithm) has not been considered. In [7], the authors have addressed the problems of charging, rate control and routing for a communication network carrying elastic traffic. Therefore, we envisage to take into account the routing strategy to extend our work. The routing issue in dynamic bandwidth allocation should be studied carefully to achieve a higher network revenue while satisfying, at the same time, the individual users’ requirements. On the other hand, realizing flexible and efficient bandwidth allocation in wireless networks presents several technical challenges, including physical layer impairments, mobility and bandwidth mismatch between wireline and wireless networks. Physical layer impairments (e.g., co-channel interference, hidden terminals, path-loss, fast fading and shadowing) contribute toward time-varying error characteristics and time-varying channel capacity making the delivery of hard QOS guarantees unlikely. In addition, user mobility can trigger rapid degradation in the delivered service quality (e.g., during handoff). Hence, one important perspective of this thesis can be devoted to study the challenging points in wireless networks and extend our work to this area. 85
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Thèse de Doctorat de l’universit
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To my family.
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Abstract Efficient dynamic resource
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Acknowledgements I would like to th
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4.2 Connections Classification . .
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Résumé delaThèse 1. La probléma
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supérieure sur les performances qu
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compte les fonctions d’utilité d
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(Policy Decision Point), d’un ens
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ligne pour individualiser la bande
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6. Nous proposons trois algorithmes
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appelons débit de crête. Six sour
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6. Conclusion générale et Perspec
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Chapter 1 Introduction The Internet
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upper bounds to the performance ach
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Chapter 2 Dynamic Bandwidth Allocat
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Utility Function Types In a multi-a
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comes smaller than the application
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of which there exist extensive theo
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allows us to allocate the bandwidth
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Shenker in [10] states that the net
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