Radio access discovery of communication nodes within cognitive radio networks is paramount for successful cognitive radio operation. In this paper, radio access discovery methods utilised in wireless communication networks are described by examining their advantages, disadvantages, and suitability for deployment in cognitive radio networks. The concept of Ad hoc temporary control channel is proposed as a method for radio access discovery in cognitive radio networks. The proposed method utilises the "broadcast on demand" approach where cognitive radio initiates network broadcast by sending a "Hello" message in order to acquire necessary information for network entry.

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