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| October 30, 2018
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Wireless networks use Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) to control media access and avoid (rather than detect) collisions.Collision avoidance uses the following steps (processes):[A] The sending device listens to make sure that no other device is transmitting. If anotherdevice is transmitting, the device waits a random period of time (called a back off period)before attempting to send again.[B] If no other device is transmitting, the sending device broadcasts a Request to send (RTS)message to the receiver or AP. The RTS includes the source and destination, as well asinformation on the duration of the requested communication.[C] The receiving device responds with a Clear to send (CTS) message. The CTS also includesthe communication duration period. Other devices use the information in the RTS andCTS to delay send attempts until the communication duration period (and subsequentacknowledgement) has passed.[D] The sending device transmits the data. The receiving device responds with anacknowledgement (ACK). If an acknowledgement is not received, the sending deviceassumes a collision occurred and retransmits the affected packet.[E] After the time interval specified in the RTS and CTS has passed, other devices can start theprocess again to attempt to transmit.Question (write 1-2 pages of Paper) Summarize the above collision detection processes (stages) explaining the following keypoints:[A] Describe why the use of RTS and CTS (steps 2 and 3) is optional and depends on thecapabilities of the wireless devices.[B] Describe why without RTS/CTS, collisions are more likely to occur.[C] Devices can both send and receive, but not at the same time.[D] Explain why devices must take turns using the transmission channel.[E] Explain why once a party begins receiving a signal, it must wait for the transmitter tostop transmitting before it can reply.©Copyright 2000-2018. All Rights Reserved. TermPaperChampions.com: The most reliable provider of custom academic papers. Our writers are here to help you complete papers from all disciplines and academic levels . You can always trust us to deliver.
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