Censoring-Based Relay Transmission for Achieving Energy Efficiency in Cognitive Radio Networks

Table 1

System parameters.

Symbol	Description
	Channel coefficient between the link
	Time slot duration
	Sensing phase duration of MAC frame
	Received signal-to-noise ratio at
	Sensing time allocation factor
	Number of available secondary relays
	Secondary source, relay circuit power consumptions, and total transmission power
	False alarm probability and detection probability of each SU
	Transmitting power allocation on and
	Transition matrix of PU’s state
	Global detection probability and false alarm probability of CSS
	Sensing, decision reporting consumption power for each SU
	Average energy of CSS
	Secondary transmitting average throughput
	Secondary transmitting average energy consumption
	Mean energy efficiency
	Stationary probabilities for primary band to be busy and idle
	Secondary outage probability
	Minimum global detection probability of secondary transmission
	Maximum outage probability of secondary transmission
	Average busy and idle periods
	Noise power
	Transmission data rate of the link