在认知无线电网络中，次级用户要实现动态频谱接入，需要考虑到相关网络技术

In a cognitive radio network, for secondary users to achieve dynamic spectrum access, it is necessary to consider the correspondence between related network technologies and various layers in the cognitive radio network. Cross-layer protocols, as well as spectrum sensing technology, spectrum decision technology, spectrum switching technology, spectrum sharing technology and spectrum allocation technology in cognitive radio networks [14]

In cognitive radio networks, secondary users need to take into account the correspondence between the relevant network technology and the cognitive radio network at all levels, which involve physical layer transmission technology, routing technology, transmission layer protocol, cross-layer protocol, as well as spectrum perception technology, spectrum decision-making technology, spectrum switching technology, spectrum sharing technology and spectrum allocation technology in cognitive radio network.

In cognitive radio network, in order to realize dynamic spectrum access, secondary users need to consider the corresponding relationship between related network technology and each layer of cognitive radio network, including physical layer transmission technology, routing technology, transmission layer protocol, cross layer protocol, etc., as well as spectrum sensing technology, spectrum decision-making technology, spectrum switching technology and spectrum in cognitive radio network Sharing technology and spectrum allocation technology [14].