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In this paper, we discuss the regulatory scenario for cognitive radio networks and give an overview of the emerging IEEE 802.22 standard, which is based on a dynamic spectrum access model, and provides new opportunities for wireless broadband access in rural area and remote communities. We discuss the main design challenges for the shared spectrum access model and describe how they are being addressed within the scope of the 802.22 networks. Some of the key design issues include incumbentdoi:10.1109/crowncom.2008.4562540 dblp:conf/crowncom/CavalcantiG08 fatcat:5dvjj5b7ijeazpf7a65ae6cfiu