A cluster communication system based on single base station comprises base station set at cell of each single base station separately and relay device set at adjacent cell of single base station and used to carry out communication interaction. It is featured as confirming a corresponding transmission channel for each relay device for making relay devices at each cell carry out information-interaction by base station, utilizing relay device in each cell to interact information received from each cell. The multicall communication method based on single base station and a relay device are also disclosed. |