In a sliding window ARQ scheme, the transmitter's window size is N and the receiver's window size is M. The minimum number of distinct sequence number

Question

**In a sliding window ARQ scheme, the transmitter's window size is N and the receiver's window size is M. The minimum number of distinct sequence numbers required to ensure correct operation of the ARQ scheme is**
(i) min(M, N)
(ii) max(M, N)
(iii) M + N
(iv) M × N

Accepted Answer

## Solution

The minimum number of distinct sequence numbers must be large enough to distinguish all frames that may be outstanding at the same time. For a sliding-window ARQ scheme with transmitter window size $N$ and receiver window size $M$, the required number of distinct sequence numbers is determined by the larger window size.

Therefore, the answer is:

**(ii) $\max(M,N)$**

So the minimum number of distinct sequence numbers required is **$\max(M,N)$**.

Solution

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