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We study the structure of the optimal sampling policy to minimize the averageage of information when the channel state (i.e., busy or idle) is notimmediately perceived by the transmitter upon the delivery of a sample due torandom delays in the feedback (ACK) channel. In this setting, we show that itis not always optimal to wait for ACKs before sampling, and thus, earlysampling before the arrival of an ACK may be optimal. We show that, undercertain conditions on the distribution of the ACK delays, the optimal policy isa mixture of two threshold policies.

The Role of Early Sampling in Age of Information Minimization in the Presence of ACK Delays