An ARQ mechanism considering resource and traffic priorities in cognitive radio systems
IEEE Communications Letters
A novel spectrum sharing algorithm based on the throughput in cognitive radio networks
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
Optimal route selection and resource allocation in multi-hop cognitive radio networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Opportunistic exploitation of bandwidth resources through reinforcement learning
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Proceedings of the 6th International Wireless Communications and Mobile Computing Conference
Decentralized fair resource allocation for relay-assisted cognitive cellular downlink systems
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Scalable video multicast in cognitive radio networks
IEEE Journal on Selected Areas in Communications
Optimal traffic splitting in multi-hop cognitive radio networks
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Protocol design and delay analysis of half-duplex buffered cognitive relay systems
IEEE Transactions on Wireless Communications
Streaming scalable videos over multi-hop cognitive radio networks
IEEE Transactions on Wireless Communications
Routing in cognitive radio networks: Challenges and solutions
Ad Hoc Networks
Cognitive radios for dynamic spectrum access: from concept to reality
IEEE Wireless Communications
Joint Bandwidth and Power Allocations for Cognitive Radio Networks with Imperfect Spectrum Sensing
Wireless Personal Communications: An International Journal
Joint Subchannel, Rate and Power Allocation in OFDMA-Based Cognitive Wireless Mesh Network
Wireless Personal Communications: An International Journal
Initial spectrum access control with QoS protection for active users in cognitive wireless networks
International Journal of Communication Systems
IEEE/ACM Transactions on Networking (TON)
Computer Networks: The International Journal of Computer and Telecommunications Networking
Joint spectrum allocation and relay selection in cellular cognitive radio networks
Mobile Networks and Applications - Special issue on Wireless and Personal Communications
Distributed resource allocation based on queue balancing in multihop cognitive radio networks
IEEE/ACM Transactions on Networking (TON)
Wireless Personal Communications: An International Journal
Primary weight measure and its support in stochastic routing for dynamic cognitive radio networks
Proceedings of the 1st ACM workshop on Cognitive radio architectures for broadband
Economic model for routing and spectrum management in cognitive wireless mesh network
International Journal of Networking and Virtual Organisations
Joint optimal AF relay assignment and power allocation in wireless cooperative networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Dynamic Spectrum Sharing for OFDMA-Based Multi-hop Cognitive Radio Networks with Priority
Wireless Personal Communications: An International Journal
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Cognitive radio (CR) capitalizes advances in signal processing and radio technology and is capable of reconfiguring RF and switching to desired frequency bands. It is a frequency-agile data communication device that is vastly more powerful than recently proposed multi-channel multi-radio (MC-MR) technology. In this paper, we investigate the important problem of multi-hop networking with CR nodes. For such a network, each node has a pool of frequency bands (typically of unequal size) that can be used for communication. The potential difference in the bandwidth among the available frequency bands prompts the need to further divide these bands into sub-bands for optimal spectrum sharing. We characterize the behavior and constraints for such a multi-hop CR network from multiple layers, including modeling of spectrum sharing and sub-band division, scheduling and interference constraints, and flow routing. We develop a mathematical formulation with the objective of minimizing the required network-wide radio spectrum resource for a set of user sessions. Since the formulated model is a mixed-integer non-linear program (MINLP), which is NP-hard in general, we develop a lower bound for the objective by relaxing the integer variables and using a linearization technique. Subsequently, we design a near-optimal algorithm to solve this MINLP problem. This algorithm is based on a novel sequential fixing procedure, where the integer variables are determined iteratively via a sequence of linear programs. Simulation results show that solutions obtained by this algorithm are very close to the lower bounds obtained via the proposed relaxation, thus suggesting that the solution produced by the algorithm is near-optimal.