Select the correct alternative from the given choices. A...

Select the correct alternative from the given choices. A satellite channel has capacity of $\mathrm{B}$ bits $/ \mathrm{sec}$, the frame size is of $L$ bits, and round trip propagation time of $\mathrm{R}$ sec, uses stop and wait protocol, what is the channel utilization? (A) $\frac{L}{L-B R}$ (B) $\frac{L}{L+B R}$ (C) $\frac{L}{B+R}$ (D) $\frac{L}{B-R}$

Select the correct alternative from the given choices.
A satellite channel has capacity of $\mathrm{B}$ bits $/ \mathrm{sec}$, the frame size is of $L$ bits, and round trip propagation time of $\mathrm{R}$ sec, uses stop and wait protocol, what is the channel utilization?
(A) $\frac{L}{L-B R}$
(B) $\frac{L}{L+B R}$
(C) $\frac{L}{B+R}$
(D) $\frac{L}{B-R}$

Key Concepts

Stop and Wait Protocol

The stop and wait protocol is a basic method of data transmission used in reliable communication systems. In this protocol, the sender transmits a single frame and then waits for an acknowledgment from the receiver before sending the next frame. This method ensures that data is sent reliably, but it can lead to inefficiencies, especially when the round trip delay is large compared to the frame transmission time.

Channel Utilization

Channel utilization refers to the fraction of time a communication channel is effectively used for transmitting useful data, relative to the total time, which includes both transmission and waiting periods. It is an important performance metric that helps in evaluating the efficiency of a protocol in using the available channel capacity.

Transmission Time

Transmission time is the amount of time required to send a frame over the channel, which is determined by dividing the frame size by the channel capacity. This concept is critical in calculating overall protocol efficiency, as longer transmission times can increase the effective use of the channel relative to propagation delays in certain situations.

Propagation Delay and Round Trip Time (RTT)

Propagation delay is the time required for a signal to travel from the sender to the receiver, and the round trip time (RTT) is the total time for a signal to go to the receiver and for the acknowledgment to return to the sender. In stop and wait protocols, the RTT plays a crucial role in channel utilization since the sender remains idle during this period, affecting the overall throughput.

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