On Acknowledgment Schemes of Sliding Window Flow Control JUN-KYUN CHOI, MEMBER, EEE,
Send Piggybacked Ack · 1989
We investigate two acknowledgment schemes of sliding window flow control in packet communication. Those are the delayed acknowledgment (D-ACK) scheme and the window acknowledgement (W-ACK) scheme. It is shown that the acknowledgment scheme of the link layer of X.25 protocol can be modeled by the D-ACK scheme and that of the packet layer by the W-ACK scheme. The efficiencies of these acknowledgment schemes are shown by the mean number of acknowledg- ment control frames generated for the transmission of a single informa- tion frame, the transdon blocking probability, and the mean transmis- sion time of data frames. By numerical and simulation resnlts, we show that the D-ACK scheme with an appropriately selected valoe of predeter- mined waiting time Td is better than the W-ACK scheme.