On the successful transmission probability of cooperative cognitive radio ad hoc networks

We study the successful transmission probability of cognitive radio ad hoc networks in which secondary users assist primary users on transmitting packets. We propose a half-slotted ALOHA multiple access control protocol. Primary transmitters sacrifice second half slot for the reliability improved by the cooperative transmission of secondary users. We derive the closed-form expression of successful transmission probability for both primary and secondary network in the first-half slot. In the second half, we obtain the bounds of successful transmission probability for primary network and the closed-form expression of successful transmission probability for secondary network. Numerical results show that the successful transmission probability of both networks could achieve a maximum by optimizing the intensity of secondary users in the whole time slot.