1. A judgment method of channel occupancy, comprising:clustering according to geographic position information of small cells on a same frequency band, each of the small cells being a small cell working in a licensed frequency spectrum or a LAA cell working in an unlicensed spectrum;
when all of the small cells are small cells working in the licensed frequency spectrum, dividing the small cells in a cluster into a first set, or when all of the small cells are small cells working in the unlicensed frequency spectrum, after executing a clear channel assessment (CCA) on LAA cells in the cluster periodically and synchronously, dividing LAA cells whose channels are detected to be idle into the first set;
calculating an interference value between every two small cells in the first set and comparing with a preset interference threshold value, and dividing a small cell combination having an interference value larger than the preset interference threshold value into a second set, or dividing a small cell combination having an interference value equaling to or small than the preset interference threshold value into a third set;
receiving priority information reported by each of small cells in the second set, and dividing the small cells in the second set into an active set and a restrained set according to the priority information and the geographic position information of each of the small cells;
sending transmission control signaling to small cells in the third set, the active set and the restrained set, to make the small cells in the third set and the small cells in the active set start transmitting data after receiving the transmission control signaling, and to make the small cells in the restrained set enter a non-sending state within a channel occupation period after receiving the transmission control signaling.