What is CSA (Concurrent Spectrum Access)?

Concurrent spectrum access (CSA) permits diverse communication frameworks to send on a similar frequency band, has been perceived as the main strategy to acknowledge dynamic spectrum management. CSA has the value of minimal cost and simple execution in practice.
The CSA permits one or different secondary users (SUs) to transmit on the primary spectrum, given that the impedance to the primary users (PUs) can be directed. CSA can accomplish higher region spectral efficiency because of its spatial reuse of spectrum and can be utilized to accommodate the dense wireless traffic in host-spot regions