New methods to color the vertices of a graph
Communications of the ACM
Introduction to 3G Mobile Communications
Introduction to 3G Mobile Communications
GSM Switching, Services and Protocols
GSM Switching, Services and Protocols
Stochastic Local Search: Foundations & Applications
Stochastic Local Search: Foundations & Applications
Frequency Allocation for WLANs Using Graph Colouring Techniques
WONS '05 Proceedings of the Second Annual Conference on Wireless On-demand Network Systems and Services
Dynamic channel assignment with cumulative co-channel interference
ACM SIGMOBILE Mobile Computing and Communications Review
Software-defined radio: basics and evolution to cognitive radio
EURASIP Journal on Wireless Communications and Networking
Multimode communication protocols enabling reconfigurable radios
EURASIP Journal on Wireless Communications and Networking
Modeling and analysis of interference in listen-before-talk spectrum access schemes
International Journal of Network Management
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Cognitive Radio promises better spectrum utilisation through decentralised control, sensing and decision making. The devices are intended to be inexpensive, upgradeable and adaptable. However, introducing upgraded devices into a decentralised environment may cause unexpected results, the upgrades may require a critical mass to show any benefit, and may have an adverse impact on existing devices, which may deter their adoption. We study, in simulation, the gradual introduction of cognitive devices into an existing population using a spectrum access etiquette, in three different scenarios for the device capability. We show that the new devices gain immediate benefits, and that there is always an incentive to upgrade. We show that overall spectrum efficiency is improved. Finally, we show that there is no negative impact on existing devices, and that the introduction of cognitive devices may even improve the success rate of lesser devices.