I am studying network communication and get confused about this concept. Since I know DCF has the backoff scheme for frame transmission and will sense the channel status before start transmit data. So the only scenario I can know by now for a collision is that, during traffic time, several stations might ask for transmission at the same time after a channel released. But I think this obviously not the only possibility. Can anyone please explain more about the possible collisions in DCF WLANs?

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