An Interference Temperature Constraints Model for Spectrum Access in Cognitive Radio Networks

With the advent of cognitive radio technology, new paradigms for spectrum access can achieve nearoptimal spectrum utilisation by letting each user sense and utilise available spectrum opportunistically while regulating the interference it imposes on other users through interference constraints. However, the most common forms of binary and transmitter-centric constraints are often inef cient since they only consider pair-wise sets of transmitters and prohibit any interference at receivers. In line with the recently proposed interference temperature metric, we propose a non-binary receivercentric constraints model that constraints whole subsets of transmitters and is easy to generate and test. By permitting interfering signals to be introduced, additional communication can be supported, leading to improved spectrum utilisation in cognitive radio networks compared with using transmitter-centric constraints. This is veri ed intuitively as well as through numerical experiments. Our proposed constraints are currently being used to devise a co-operative negotiated etiquette for cognitive radios offering heterogeneous services in a wireless of ce networking scenario.1 1A preliminary version of this paper has been submitted to the IEEE CogNet 2007 Workshop.