Data networks (2nd ed.)
A storage model with a two-state random environment
Operations Research - Supplement to Operations Research: stochastic processes
Balanced allocations (extended abstract)
STOC '94 Proceedings of the twenty-sixth annual ACM symposium on Theory of computing
The power of two choices in randomized load balancing
The power of two choices in randomized load balancing
Queuing network models for delay analysis of multihop wireless ad hoc networks
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Dynamic spectrum access in WLAN channels: empirical model and its stochastic analysis
TAPAS '06 Proceedings of the first international workshop on Technology and policy for accessing spectrum
A fluid-flow model for backlog-based CSMA policies
Proceedings of the 4th Annual International Conference on Wireless Internet
Control Techniques for Complex Networks
Control Techniques for Complex Networks
Queuing analysis in multichannel cognitive spectrum access: a large deviation approach
INFOCOM'10 Proceedings of the 29th conference on Information communications
On myopic sensing for multi-channel opportunistic access: structure, optimality, and performance
IEEE Transactions on Wireless Communications - Part 2
Stability of N interacting queues in random-access systems
IEEE Transactions on Information Theory
Spectrum sharing for unlicensed bands
IEEE Journal on Selected Areas in Communications
Queuing analysis in multichannel cognitive spectrum access: a large deviation approach
INFOCOM'10 Proceedings of the 29th conference on Information communications
Proceedings of the 5th International Conference on Ubiquitous Information Management and Communication
Analysis of optimal random access policies for cognitive radio networks under Rayleigh fading
Proceedings of the 6th International Conference on Queueing Theory and Network Applications
Pricing-based decentralized spectrum access control in cognitive radio networks
IEEE/ACM Transactions on Networking (TON)
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We consider a cognitive radio network where multiple secondary users (SUs) contend for spectrum usage, using random access, over available primary user (PU) channels. Our focus is on SUs' queueing delay performance, for which a systematic understanding is lacking. We take a fluid queue approximation approach to study the steady-state delay performance of SUs, for cases with a single PU channel and multiple PU channels. Using stochastic fluid models, we represent the queue dynamics as Poisson driven stochastic differential equations, and characterize the moments of the SUs' queue lengths accordingly. Since in practical systems, a secondary user would have no knowledge of other users' activities, its contention probability has to be set based on local information. With this observation, we develop adaptive algorithms to find the optimal contention probability that minimizes the mean queue lengths. Moreover, we study the impact of multiple channels and multiple interfaces, on SUs' delay performance. As expected, the use of multiple channels and/or multiple interfaces leads to significant delay reduction.