Consider a Full-Duplex wireless communications link across which a Go-Back-N ARQ error-control scheme is employed.
The transmission data rate across the channel (in each direction) is equal to 10 Mbps.
The length of the link is 100 Km, and the propagation rate is .000005 seconds per Km.
An ACK packet contains 400 bits.
The frame (on which the error control scheme operates) contains 2000 information bits and 200 overhead bits
(i.e., the total frame size is 2200 bits).
We neglect the probability of incorrect ACK receptions.
Receiver and transmitter reaction times are each equal to .00001 seconds
The bit error rate across the channel is equal to .0002
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What is the range for setting the window size of W = N [packets] to assure the ability of the sender to receive an ACK prior to exhausting its window quota of W packets?
Also, what is the probability that a packet will have to be retransmitted at least one time?