In CSMA/CA, why do you need a contention window, even after DIFS? What is the typical size

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In CSMA/CA, why do you need a contention window, even after DIFS? What is the typical size of the contention window?

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Introduction to Wireless and Mobile Systems

ISBN: ?978-1305087132

4th edition

Authors: Dharma P. Agrawal, Qing An Zeng

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