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Slotted Aloha Performance Improvement

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Questions and Answers

In p-persistent CSMA, what does a node do once the medium is no longer busy?

Decides to transmit with a certain probability (correct)

Waits for a random backoff and then re-senses the channel

Continuously senses the channel until it becomes idle

Starts transmitting immediately

What is the basis of Wi-Fi's CSMA method?

p-persistent CSMA (correct)

Non-persistent CSMA

Slotted Aloha

Random backoff

What does a node do in non-persistent CSMA when it finds the channel busy?

Decides to transmit with a certain probability

Continuously senses the channel until it becomes idle

Starts transmitting immediately

Waits for a random backoff and then re-senses the channel (correct)

What does p represent in p-persistent CSMA?

Probability to transmit Signup and view all the answers

Which CSMA method involves continuously sensing the channel until it becomes idle?

Non-persistent CSMA Signup and view all the answers

What does the throughput metric (S) in MAC protocols represent?

The quantity of traffic the network was able to send Signup and view all the answers

Which metric quantifies the time separating when a frame is given to the MAC layer and when it is sent?

D Signup and view all the answers

In modeling assumptions for MAC protocols, what type of distribution does the offered load (G) respect?

Poisson distribution Signup and view all the answers

What is the performance impact of loss due to synchronization and guard intervals in deterministic MAC protocols?

Decrease in throughput (S) Signup and view all the answers

Which performance evaluation method states that all transmissions eventually converge to zero?

Slotted Aloha Signup and view all the answers

In probabilistic MAC protocols, what leads to a decrease in the network's ability to absorb offered load?

Overhead of distribution (random backoff) Signup and view all the answers

In Slotted Aloha, how does the improvement help in reducing collisions?

Nodes send traffic at the start of predefined timeslots Signup and view all the answers

Which statement best describes the concept of Clear Channel Assessment (CCA) in random access with channel sensing?

CCA involves checking the energy level on the channel Signup and view all the answers

What is the main purpose of CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) in avoiding collisions?

To prevent collisions by sensing the channel before transmission Signup and view all the answers

In CSMA 1-persistent method, what does a node do if the channel is busy?

The node listens and waits for the channel to become idle Signup and view all the answers

Which statement best describes p-persistent CSMA in terms of persistence levels?

p-persistent CSMA varies the persistence level depending on 'p' Signup and view all the answers

What distinguishes Non-persistent CSMA from 1-persistent CSMA?

1-persistent CSMA keeps trying to transmit without regard for channel status Signup and view all the answers