How Is Collision Detected in 802.11n WiFi Networks?

ieee 802.11wireless

IN CSMA/CA, suppose the channel is idle.
Two nodes that have been waiting for the same backoff time, start transmitting simultaneously.
The nodes detect the collision and double the Contention Window and back off again.

I want to know how does the node hardware detect such a collision?

Best Answer

I want to know how does the node hardware detect such a collision?

A WiFi node doesn't detect a collision the way Ethernet does. Instead, every frame is acknowledged by the receiver. So if the frame is not acknowledged, the sender assumes there was a collision. It waits a random (back-off) time and tries again.

Here is a more in-depth explanation of the protocol.

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