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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