CSMA/CA in Wireless & Mobile Systems Quiz
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Questions and Answers

In a nonpersistent CSMA protocol, what is the first step when the medium is idle?

  • Increase the contention window size
  • Listen to the medium
  • Transmit immediately (correct)
  • Wait for a random amount of time

    • For unslotted nonpersistent CSMA, what factor reduces the probability of collisions?

  • Packet transmission time
  • Random backoff time (correct)
  • Propagation delay
  • Data rate

    • What is the throughput equation for slotted nonpersistent CSMA?

  • (αGe^-2αT) / ((1 - e^-αG) + α)
  • (1 - e^-αG) / (1 + α) (correct)
  • (1 - e^-αG) / (1 + α) (correct)
  • (1 + e^-αG) / (1 - α)

    • What happens if the backoff time in nonpersistent CSMA is too long?

    <p>It wastes idle time</p> Signup and view all the answers

    Which factor influences the throughput in nonpersistent CSMA protocols?

    <p>Random delay duration</p> Signup and view all the answers

    What is the purpose of Distributed Inter Frame Space (DIFS) in CSMA/CA?

    <p>To define the period of time each terminal must wait before transmitting</p> Signup and view all the answers

    How does a terminal choose when to start transmitting after DIFS in CSMA/CA?

    <p>By picking a random number of slots within the contention window</p> Signup and view all the answers

    When does a terminal freeze its backoff counter in CSMA/CA?

    <p>When other terminals start transmitting during its backoff time</p> Signup and view all the answers

    What does the contention window determine in CSMA/CA?

    <p>The number of slots each terminal must wait before transmitting</p> Signup and view all the answers

    In CSMA/CA, what happens if a terminal tries to transmit and senses the medium is busy?

    <p>It waits until the current transmission ends and then starts DIFS countdown</p> Signup and view all the answers

    Why does a terminal pick a random number of slots within the contention window before transmitting in CSMA/CA?

    <p>To introduce random delays and minimize collisions</p> Signup and view all the answers

    What does DIFS stand for in the context of wireless communication?

    <p>Distributed Inter Frame Space</p> Signup and view all the answers

    What happens when the backoff interval of a node reaches zero in a CSMA/CA protocol?

    <p>The node immediately transmits its data</p> Signup and view all the answers

    In the context of the text, what does CW = 31 refer to?

    <p>Contention Window</p> Signup and view all the answers

    What role does Random Delay play in the CSMA/CA protocol?

    <p>It helps nodes choose random backoff intervals</p> Signup and view all the answers

    Why does a node freeze its backoff interval when it detects the medium as busy?

    <p>To reduce the probability of collision</p> Signup and view all the answers

    What is the purpose of Distributed Inter Frame Spacing (DIFS) in wireless communication?

    <p>To introduce a delay between transmissions by different stations</p> Signup and view all the answers

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