Patent ID: 7974240

Claim:
A cellular network based on relay station, comprising a base station, a relay station and a user equipment, wherein the base station has at least one antenna and the relay station has at least two antennas, wherein the base station allocates resources for the user equipment, transmits a downlink signal in a current slot and receives an uplink signal from the user equipment through the relay station in the next slot; the relay station receives the downlink signal from the base station and the uplink signal from the user equipment in the current slot and transmits the received downlink signal to the user equipment and the uplink signal to the base station in the next slot; the user equipment transmits the uplink signal in the current slot and receives the downlink signal through the relay station in the next slot, and wherein the uplink signal and the downlink signal transmitted in the same slot are orthogonal, and wherein after receiving the downlink signal from the base station and the uplink signal from the user equipment in the current slot, the relay station obtains corresponding beam coefficients of the downlink and the uplink signals according to pilot signals of the downlink and the uplink signals, transmit the uplink signal to the base station in the next slot using the beam coefficient of the downlink signal obtained in the current slot and transmits the downlink signal to the user equipment in the next slot using the beam coefficient of the uplink signal obtained in the current slot.