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CCA

The different 802.11 standards define five different CCA modes for use in the 2.4 GHz band:

  • Energy detection bases the CCA decision only on whether energy was detected over a threshold.

  • Carrier sense bases the CCA decision purely upon whether an 802.11 signal is detected.

  • Carrier sense with energy detection uses a combination of modes 1 and 2.

  • Carrier sense with timer reports that the medium is idle if no 802.11 signal is detected for 3.65 milliseconds.

  • Extended rate PHY energy detection and carrier sense is much the same as mode 3 but applied to the ERP.

It is mandatory that the CCA process employ at least one of these modes.

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