Sensing in opportunistic spectrum access (OSA) has a responsibility to detect the available channel by performing binary hypothesis as busy or idle states. If channel is busy. secondary user (SU) cannot access and refrain from data transmission. SU is allowed to access when primary user (PU) does not use it (idle states). https://www.animationbengal.com/?w=deal-time-the-best-of-shirley-temple-vol-ii-online-now-super-choice