IEEE 802.22 WRAN with CR

Wireless Regional Area Network (WRAN) using white spaces in the TV frequency spectrum. Aimed at using cognitive radio (CR) techniques to allow sharing of geographically unused spectrum allocated to the Television Broadcast Service, on a non-interfering basis, to bring broadband access to hard-to-reach, low population density areas, typical of rural environments, and is therefore timely and has the potential for a wide applicability worldwide.