关键词: 认知无线电，认知网络，无线网络架构

Abstract: Due to the growing bandwidth, business and the existing fixed frequency management mode, the wireless network is facing great challenges that the network resources are becoming more and more shortage. The dynamic changes of heterogeneous network environment causes more conflicts between resource shortage and business needs, so it seriously restricts the deployment and operation of wireless network in the present and future. I'o solve the above problem,this paper made a detailed discussion and analysis to the existing protocols of wireless network, and it summarized the characteristics and existing problems including the cognitive function of IEEE 802. 22，IEEE 1900. 4 and ETSI RRS. It proposed a novel architecture for cognitive wireless network based on the cognitive theory and method of wireless network. This model contains system frequency management, network planning management, heavy configuration management, wireless resource management, cognitive ring processing and cognitie information load mode etc. According to this architecture, it will be better to coordinate and support network learning, reasoning, forecasting, fusion, decision-making and reconfiguration.

Key words: Cognitive radio, Cognitive network, Wireless network architecture