Curiosity and Confusion -->> personal source

Question

Am I Correct? Suppose we have 3-bit sequence number and acknowlwdgements are piggybacked. Then channel utilization is

A. Stop and Wait

                       =Transmission time/(2*transmission time + 2*propagation time)

B.GBN           

                       =7*transmission time/(2*transmission time + 2*propagation time)

C.SR

                     =4*transmission time/(2*transmission time + 2*propagation time)

Okay, here is the full question in which i applied above formulas::

Frames of 1000 bits are sent over a 1Mbps link between earth and moon whose propagation delay is 270msec. Headers are very short and acknowledgments are always piggybacked on to data frames.

Three bit sequence numbers are used. What is the maximum channel achievable channel utilization in

A.Stop and wait

B. GBN

C.SR

Comments

For that both sender and receiver must be sending data continuously. I mean no such data mentioned in your question.

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Please check now. I have edited the question.

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if u have taken the transmission time in Numerator then u must do the same for the Denominator.

Answer 1

@Shivam. Why are you taking

2*transmission time

in the remainder? It must be simply transmission time.

Comments

@Sushant+Gokhale because acknowledgments are  piggybacked thus we have to consider transmission time of acknowledgment also

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Good point :)

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@Sushant+Gokhale I have edited all the formulas.

@Arjun sir please verify above formulas