Patent ID: 7110793
Filing Date: 2006-09-19
Classification: H04B,H04W

Abstract:
1. A wireless base station that transmits a control signal to a non-specific mobile station by forming an omnidirectional antenna pattern and transmits a control signal to a specific mobile station by forming an array antenna pattern, the wireless base station comprising: a judging unit for judging, when the control signal is to be transmitted to the specific mobile station, whether both of the following conditions are satisfied: (a) a difference between received reference signals in an immediately preceding reception from a mobile station is equal to or larger than a threshold value, and (b) a time lapse between the immediately preceding reception and the transmission of the control signal exceeds a predetermined length; and a controlling unit for forcing, when the judging unit judges both conditions are satisfied, the wireless base station to stop forming the array antenna pattern and to transmit the control signal by forming an omnidirectional antenna pattern, and for controlling the wireless base station so that a transmission power is lowered temporarily.