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Table 1 Notations

From: Interference-constrained adaptive simultaneous spectrum sensing and data transmission scheme for unslotted cognitive radio network

Symbol Meaning
t sp1 the most recent time when the channel switches from ON state to OFF state
t i the time of the i th data transmission of SU in Stage I
T 1 i = t i + 1 - t i the i th data transmission time period in Stage I
t sp2 the most recent time when the channel switches from OFF state to ON state
t j the time of the j th data transmission in Stage II
T 2 j = t j + 1 - t j the j th data transmission time period of Stage II
P s the transmission power of SU in Stage II
Q th the threshold to the queue length of SU transmitter in Stage II