Question

Consider a videoconferencing application in which the encoder produces a digital stream at a bit rate of $144 \mathrm{kpbs}$. The packetization delay is defined as the delay incurred by the first byte in the packet from the instant it is produced to the instant when the packet is filled. Let $P$ and $H$ be defined as they are in problem 30 . a. Find an expression for the packetization delay for this video application as a function of $P$. b. Find an expression for the efficiency as a function of $P$ and $H$. Let $H=5$ and plot the packetization delay and the efficiency versus $P$.

   Consider a videoconferencing application in which the encoder produces a digital stream at a bit rate of $144 \mathrm{kpbs}$. The packetization delay is defined as the delay incurred by the first byte in the packet from the instant it is produced to the instant when the packet is filled. Let $P$ and $H$ be defined as they are in problem 30 .
a. Find an expression for the packetization delay for this video application as a function of $P$.
b. Find an expression for the efficiency as a function of $P$ and $H$. Let $H=5$ and plot the packetization delay and the efficiency versus $P$.

Communication Networks: Fundamental Concepts and Key Architectures

Indra Widjaja,… 1st Edition

Chapter 7, Problem 31

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Step 1

The packetization delay can be calculated using the formula: Packetization delay = (Packet size in bits) / (Encoder bit rate) The packet size in bits can be calculated using the formula from problem 30: Packet size = (P + H) * 8 Substituting this into the Show more…

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Consider a videoconferencing application in which the encoder produces a digital stream at a bit rate of $144 \mathrm{kpbs}$. The packetization delay is defined as the delay incurred by the first byte in the packet from the instant it is produced to the instant when the packet is filled. Let $P$ and $H$ be defined as they are in problem 30 . a. Find an expression for the packetization delay for this video application as a function of $P$. b. Find an expression for the efficiency as a function of $P$ and $H$. Let $H=5$ and plot the packetization delay and the efficiency versus $P$.

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Key Concepts

Packetization Delay

This is the time interval that occurs while a packet is being filled with data before it is sent. In digital communication systems, it is defined as the delay from the moment the first byte of a packet is produced until the packet is fully assembled. The delay is directly related to the packet size and the bit rate of the stream, meaning that a larger packet size or a lower bit rate will result in a longer delay.

Protocol Efficiency

Protocol efficiency in a packetized communication system is the measure of how much of the transmitted data is actual payload as compared to the total bits sent, including protocol overhead like headers. It is typically quantified as the ratio of the payload size (P) to the sum of the payload size and the header size (H), indicating the overhead’s impact on the effective throughput of the system.

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