A survey on routing protocol for dynamic activity of primary user
Priyank Mishra, Vimlesh Kumar · 2016
Cognitive radio technology uses under utilized frequency bands as secondary users. Cognitive Radio technology solves the problem of limited available spectrum and the inefficiency in the spectrum usage by exploiting the existing wireless spectrum opportunistically. Since the activity of primary users varies both in space and frequency domain, diversity techniques can represent an efficient way to address this issue. In this paper a new direction of jointly exploiting path and spectrum diversity is explained for efficient use of spectrum in Cognitive Radio Ad hoc Networks. By jointly exploiting both the diversities, Cognitive Users (CUs) can switch dynamically to different paths and spectrum bands for communicating with each other in presence of space and frequency-varying primary user activity.