Choosing A Window Size (N)
There are a few things to keep in mind when choosing a value for N.
1: The sender must not transmit too fast. N should be bounded by the receiver’s ability to process packets.
2: N must be smaller than the number of sequence numbers (if they are numbered from zero to N) to verify transmission in cases of any packet (any data or ACK packet) being dropped.
3: Given the bounds presented in (1) and (2), choose N to be the largest number possible.
Read more about this topic: Go-Back-N ARQ
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