Chapter 8
802.11 Medium Access
In this chapter, you will learn about the following:
CSMA/CA vs. CSMA/CD
Collision detection
Distributed Coordination Function (DCF)
Interframe space (IFS)
Duration/ID field
Carrier sense
Random back-off timer
Point Coordination Function (PCF)
Hybrid Coordination Function (HCF)
Enhanced Distributed Channel Access (EDCA)
HCF Controlled Channel Access (HCCA)
Block acknowledgment (BA)
Wi-Fi Multimedia (WMM)
Airtime Fairness
One of the difficulties we had in writing this chapter was that in order for you to understand how a wireless station gains access to the media, we have to teach more than what is needed for the CWNA exam. The details are needed to grasp the concepts; however, it is the concepts that you will be ...
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