Dual band connectivity of cognitive radio networks
Proceedings of the 4th International Conference on Cognitive Radio and Advanced Spectrum Management
Coordination of multi-link spectrum handoff in multi-radio multi-hop cognitive networks
Journal of Parallel and Distributed Computing
Temporal Traffic Dynamics Improve the Connectivity of Ad Hoc Cognitive Radio Networks
IEEE/ACM Transactions on Networking (TON)
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We analyze the multihop delay of ad hoc cognitive radio networks, where the transmission delay of each hop consists of the propagation delay and the waiting time for the availability of the communication channel (i.e. the occurrence of a spectrum opportunity at this hop). Using theories and techniques from continuum percolation and ergodicity, we establish the scaling law of the minimum multihop delay with respect to the source-destination distance in cognitive radio networks. When the propagation delay is negligible, we show the starkly different scaling behavior of the minimum multihop delay in instantaneously connected networks as compared to networks that are only intermittently connected due to scarcity of spectrum opportunities. Specifically, if the network is instantaneously connected, the minimum multihop delay is asymptotically independent of the distance; if the network is only intermittently connected, the minimum multihop delay scales linearly with the distance. When the propagation delay is nonnegligible but small, we show that although the scaling order is always linear, the scaling rate for an instantaneously connected network can be orders of magnitude smaller than the one for an intermittently connected network.