Abstract:

Base station is not supplied to supported spectrum management for cognitive radio networks Ad Hoc, so communication among nodes may be failed because there is not a shared frequency between communication nodes. In order to deal with this question, a scheme of spectrum management based on random graph theory is proposed. Users select part of spectrums from the spare spectrum set whose number is computed by the parameter including spectrums size, network scale, link connection probability before joining in network. In communications the communication efficiency is not reduced even if every user’s spectrum resource is limited. In experiments the scheme guarantees the high probability of connective for each node having few frequencies; and the path of communication does not increase due to small spectrum scale. Therefore this scheme is suitalble to the surrounding that CR Ad Hoc network can be deployed quickly and flexibly.

Key words: cognitive radio;spectrum management;random graph;connection probability；path length