The closed form solutions are derived, which show that SU should transmit in "OFF slots" as much as possible, and that the proposed OSA strategy has low computational cost.
That is to say, transmitting in "OFF slot" is always better than transmitting in "ON slot".
The first property of Lemma 1 means transmitting in "ON slot" will always cause more interference than transmitting in "OFF slot".
This is because when T is very small, transmitting in "OFF slot" will cause only a few interference, then SU can use part of the "ON slot".
And as T increases, the interference caused by transmitting in "OFF slot" will increase, thus, the transmission time in "ON slot" should be reduced.
Policy π1 allows SU to transmit only in "OFF slot," which is similar to the proposed SS-SA strategy, but policy π2 allows SU to utilize both "OFF slot" and "ON slot".
The second property means if the sensing result is "OFF," transmitting in the former slot will cause less interference than transmitting in the latter slot, and if the sensing result is "ON," the conclusion is just the opposite.
Two access policies are investigated in this paper; that is, SU transmits only in "OFF slots" (i.e., the slots that the sensing results are OFF) and transmits in both "OFF slots" and "ON slots".
Skeptics who try to track such tales to their sources find that the grapevine that transmitted them trails off into mist.
The transmitted signal reflects off different objects and arrives at the receiver from multiple paths.
Yet Zuckerberg and Sandberg could achieve a laser focus without even transmitting user data off Facebook's servers.
