Channel access protocols for multihop opportunistic networks: challenges and recent developments
IEEE Network: The Magazine of Global Internetworking - Special issue title on networking over multi-hop cognitive networks
Routing and QoS provisioning in cognitive radio networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Cooperative adaptive spectrum sharing in cognitive radio networks
IEEE/ACM Transactions on Networking (TON)
Channel assignment and access protocols for spectrum-agile networks with single-transceiver radios
NETWORKING'11 Proceedings of the 10th international IFIP TC 6 conference on Networking - Volume Part II
Greedy versus dynamic channel aggregation strategy in CRNs: Markov models and performance evaluation
NETWORKING'11 Proceedings of the IFIP TC 6th international conference on Networking
Differentiated service provisioning in the MAC layer of cognitive radio mesh networks
International Journal of Communication Networks and Distributed Systems
Throughput-oriented channel assignment for opportunistic spectrum access networks
Mathematical and Computer Modelling: An International Journal
A MAC-Layer QoS Provisioning Protocol for Cognitive Radio Networks
Wireless Personal Communications: An International Journal
Computers and Electrical Engineering
Opportunistic medium access control for maximizing packet delivery rate in dynamic access networks
Journal of Network and Computer Applications
A decentralized MAC protocol for opportunistic spectrum access in cognitive wireless networks
Computer Communications
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Cognitive radio (CR) is the key enabling technology for an efficient dynamic spectrum access. It aims at exploiting an underutilized licensed spectrum by enabling opportunistic communications for unlicensed users. In this work, we first develop a distributed cognitive radio MAC (COMAC) protocol that enables unlicensed users to dynamically utilize the spectrum while limiting the interference on primary (PR) users. The main novelty in COMAC lies in not assuming a predefined CR-to-PR power mask and not requiring active coordination with PR users. COMAC provides a statistical performance guarantee for PR users by limiting the fraction of the time during which the PR users' reception is negatively affected by CR transmissions. To provide such a guarantee, we develop probabilistic models for the PR-to-PR and the PR-to-CR interference under a Rayleigh fading channel model. From these models, we derive closed-form expressions for the mean and variance of interference. Empirical results show that the distribution of the interference is approximately lognormal. Based on the developed interference models, we derive a closed-form expression for the maximum allowable power for a CR transmission. We extend the min-hop routing to exploit the available channel information for improving the perceived throughput. Our simulation results indicate that COMAC satisfies its target soft guarantees under different traffic loads and arbitrary user deployment scenarios. Results also show that exploiting the available channel information for the routing decisions can improve the end-to-end throughput of the CR network (CRN).