A Survey on Dynamic Spectrum Access Protocols for Distributed Cognitive Wireless Networks
With the rapid development of wireless communications technologies, radio spectrum has become a type of extremely scarce resources in meeting the increasing demands for broadband wireless services. However, the traditional static spectrum allocation policy leads to severe spectrum underutilization and spectrum shortage problems. The Cognitive Radio (CR) technology can detect the occupancy of the spectrum and enable the Dynamic Spectrum Access (DSA) to fill the spectrum hole caused by the static allocation policy, and thus has been widely recognized as an efficient approach to solve the above problems. The distributed Cognitive Wireless Network (CWN), which does not have central entities, is one of the major networking architectures applying the CR technology.