Consider a GoBackN ARQ system with W = 8. Assume that the sender sends the first frame
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Consider a GoBackN ARQ system with W = 8. Assume that the sender sends the first frame (sequence numbered 1) at time 0. The transmission time for all packets is the same and is equal to t, r is the propagation delay for either frames or ACKs, and r= 3t . The transmission time is effectively zero for ACKs. The sender uses a timeout of 10t starting from the end of the frame transmission.
By curious mischance, every eighth time that the sender attempts a frame transmission (whether an original frame transmission or a retransmission), the frame gets lost. ACKs never get lost.
- Draw a timing diagram from time 0 to the time when the first retransmission occurs at the sender, for some frame i, indicating all frame, ACK transmission and reception events with times and sequence numbers
- Under these conditions, when will the frame i be correctly received at the receiver for the first time?
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