Consider a broadcast channel that can transfer R bits per second. N computers (“

Question

Consider a broadcast channel that can transfer R bits per second. N computers (“nodes”) are connected to this channel. Suppose that the multiple access control protocol in this channel is based on polling. The amount of time from when a node completes transmission until the subsequent node is permitted to transmit (i.e., the “polling delay”) is dpoll. Suppose that within a polling round, a given node is allowed to transmit at most Q bits. What is the maximum throughput of this broadcast channel?

Explanation / Answer

The answer for this question is given below:

The length of a polling round is

N(Q/R + tpoll).

The number of bitstransmitted is NQ, the max throughput is NQ / N (Q/R + tpoll).

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