a channel has a bit rate of 4 kbps and a propagation delay of 30 msec. for what range of frame sizes does stop-and-wait give an efficiency of at least 50%?

Respuesta :

Minimum frame size =  160 bits

What is bit rate?

  • Whether in audio or video, bitrate refers to the amount of information present, according to director and filmmaker Mike Leonard.
  • It is frequently expressed in terms of information per second. Unlike other measures of video quality like frame rate, resolution, or video format, bitrate is a unique metric.
  • Bit Rate = Total number of Bits per Baud x Baud Rate

Bit rate = 4 kbps

One-way propagation delay = 20 ms

Efficiency = Transmission time of packet/(Transmission time of packet + 2 * Propagation delay)

  • 0.5 = x/(x + 2 * 20 * 10^-3)
  • x = 20 * 10^-3
  • x = 40 * 10^-3

Minimum frame size / Bit rate = 40 * 10^-3

Therefore, Minimum frame size = 40 * 10^-3 * 4 * 10^3 = 160 bits

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