Open Spectrum: A Path to Ubiquitous Connectivity
Queue - Wireless
Design and implementation of a multi-channel multi-interface network
REALMAN '06 Proceedings of the 2nd international workshop on Multi-hop ad hoc networks: from theory to reality
Reliable open spectrum communications through proactive spectrum access
TAPAS '06 Proceedings of the first international workshop on Technology and policy for accessing spectrum
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
A non-selfish and distributed channel selection scheme for cognitive radio ad hoc networks
Proceedings of the 13th ACM international conference on Modeling, analysis, and simulation of wireless and mobile systems
Temporal spectrum sharing based on primary user activity prediction
IEEE Transactions on Wireless Communications
Admission control and interference management in dynamic spectrum access networks
EURASIP Journal on Wireless Communications and Networking - Special issue on dynamic spectrum access: from the concept to the implementation
An efficient broadcasting scheme for cognitive radio ad hoc networks
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
Opportunistic medium access control for maximizing packet delivery rate in dynamic access networks
Journal of Network and Computer Applications
Optimal Channel Sensing Order for Various Applications in Cognitive Radio Networks
Wireless Personal Communications: An International Journal
Sequential sensing based spectrum handoff in cognitive radio networks with multiple users
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Open Spectrum systems allow fast deployment of wireless technologies by reusing under-utilized pre-allocated spectrum channels, all with minimal impact on existing primary users. However, existing proposals take a reactive sense-and-avoid approach to impulsively reconfigure spectrum usage based solely on the latest observations. This can result in frequent disruptions to operations of both primary and secondary users. In this paper, we propose a proactive spectrum access approach where secondary users utilize past channel histories to make predictions on future spectrum availability, and intelligently schedule channel usage in advance. We propose two channel selection and switching techniques to minimize disruptions to primary users and maintain reliable communication at secondary users. Both simulation and testbed results show that the proactive approach effectively reduces the interferences to primary users by up to 30%, and significantly decreases throughput jitters at secondary users.