| 摘要 |
PROBLEM TO BE SOLVED: To control transmission power in the case of VOX control and to suppress deterioration in the performance of transmission space diversity in a cellular radio communication system adopting the CDMA/TDD system. SOLUTION: When the transmission by a base station 1 is in OFF state, the base station 1 sets a transmission OFF state to a state notice bit in a head slot and sends the head slot and does not send the remaining 7 slots. A mobile station 18 receives the state notice bit and recognizes no data in existence in the received frame, a reception level detection circuit 31 detects power of the signal addressed to itself to control transmission power, and a correlation device 27 conducts correlation processing by using a spread code of a control channel sent always in the received slot, the reception level detection circuit 31 detects power of the correlation value to conduct transmission power control. In the case that the mobile station 18 is in a state of transmission OFF, the mobile station 18 sends a dummy signal that is generated by a dummy signal generator 22 and spread by a spread device 21 and the base station 1 uses the received dummy signal to select a transmission antenna. |
