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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Multimedia Networking
Exercise:
Problems
Question:14 | ISBN:9780132856201 | Edition: 6

Question

a. Consider an audio conference call in Skype with N > 2 participants. Suppose each participant generates a constant stream of rate r bps. How many bits per second will the call initiator need to send? How many bits per second will each of the other N – 1 participants need to send? What is the total send rate, aggregated over all participants?

b. Repeat part (a) for a Skype video conference call using a central server.

. Repeat part (b), but now for when each peer sends a copy of its video stream to each of the N – 1 other peers.

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Answer

a)

Given data:

Consider an audio conference call in Skype with N > 2 participants

That means, both schemes are used approximatley 25% more bandwidth.

Suppose each participant generates a constant stream of rate r bps.

Assume the first scheme has a playback delay of 5 packets.

So, the second scheme has a delay of 2 packets.

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