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Authors:
James F. Kurose, Keith W. Ross
Chapter:
Wireless And Mobile Networks
Exercise:
Problems
Question:6 | ISBN:9780132856201 | Edition: 6

Question

In step 4 of the CSMA/CA protocol, a station that successfully transmits a frame begins the CSMA/CA protocol for a second frame at step 2, rather than at step 1. What rationale might the designers of CSMA/CA have had in mind by having such a station not transmit the second frame immediately (if the channel is sensed idle)?

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Answer

If the channel is detected idle then the station does not transfer the second frame to avoid the collision

by design of the CSMA/CA. When received the protocol for first frame, a station to send second frame

begins at step 2 rather than step1.

For example:

Station X and Station Y are transfers data frames,remain all not want to transmit data. In this situation,

station X find the channel to be idle and send first frame then next second frame. Similarly Y received

the transfer data at the same time. Then leads to collision.  So, using CSMA/CD to avoid collsion.

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