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Stop and Wait Problem

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A channel has a bit rate of 64 kbps and a propagation delay of 20 msec. For what range of frame sizes does stop-and-wait give a channel efficiency of at least 50%.

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Efficiency will be 50% when the time to transmit the frame equals the ...

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Stop and Wait Problem is revealed.

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Time Sequence diagrams

Please reference this figure for the question:

55. Draw 3 time sequence diagrams that illustrate the flow of frames between points B and G in Figure 1 using the following information:

a. Stop and Wait ARQ, SENDER sends four frames (F1, F2, F3, and F4). F1, F2 and F4 are received error free, but F3 is lost in the network during its initial transmission. Continue the diagram until all frames are received are error free and properly acknowledged.

b. Go-Back-N ARQ, SENDER sends five frames (F1, F2, F3, F4, and F5). F1 through F2 are received error free but F3 is lost in the network after F4 and F5 are sent. Assume that F4 and F5 are received error free. Continue the diagram until all frames are received error free and properly acknowledged.

c. Selective Reject ARQ, SENDER sends six frames (F1, F2, F3, F4, F5 and F6) but only has a four frame send window. F1,F2 and F4 are received error free but an error is detected in F3 after F4 is received. When sent F5 is received error free while F6 is lost in the network. Continue the diagram until all frames are received error free and properly acknowledged.

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