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- W2113780567 abstract "Cognitive radio network has emerged as a prevailing technique and an exciting and promising technology which has the potential of dealing with the inflexible prerequisites and the inadequacy of the radio spectrum usage. In cognitive radios, in-band sensing is fundamental for the protection of the licensed spectrum users, enabling secondary users to vacate channels immediately upon detection of primary users. This channel sensing scheme directly affects the quality-of-service of cognitive radio user and licensed user especially with the undesirable delay induced into the system. In this thesis, a combination of different delay reduction schemes from different papers has been introduced, the first paper [47] argues about performing fine sensing for non-real time traffic, while real time traffic continues transmission in the channel. The second paper [46] argues about performing fine sensing after multiple alarms that have been triggered. Both schemes have combined with applying data rate reservation as well in order to reduce as much as possible this crucial factor of delay for IEEE 802.22 wireless regional area network and to improve the channel utilization. Data rate reservation for real time users has been applied in order to reduce the queuing delay for real time services [47]. The average packet delay for the proposed scheme combination has been analyzed, with both numerical and simulation results. The results show that the scheme combination considerably reduces the average packet delay for both real time and non-real time services and hence satisfies the performance of IEEE 802.22 wireless regional networks. Index terms–Channel sensing, Cognitive radio, energy and feature detection, IEEE 802.22, quiet period." @default.
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- W2113780567 date "2012-01-01" @default.
- W2113780567 modified "2023-09-27" @default.
- W2113780567 title "An Effecient Scheme in IEEE 802.22 WRAN for Real Time and Non Real Time Traffic Delay" @default.
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