Patent ID: 8089923

Claim:
A radio cell station apparatus to which a plurality of personal stations can establish space division multiple access, comprising: a transmitting and receiving unit for transmitting to and receiving from each of the personal stations a signal including a reference signal, which is a signal train consisting of a plurality of bits, and used for a synchronization process of a reception signal from each of the personal stations; a reference signal defining unit for defining one or more reference signals optimized for each multiplexed connection number of the personal stations establishing said space division multiple access to said radio cell station apparatus; a multiplexed connection number detection unit for detecting a number of multiplexed connections of the personal stations establishing space division multiple access during communication; and a reference signal allocation unit for: switching the reference signals that have been allocated to the personal stations establishing space division multiple access respectively prior to a change in the number of multiplexed connections to reference signals for maintaining communication quality even after the number of multiplexed connections is changed, and allocating the switched reference signals to said plurality of personal stations respectively, when the change in the number of multiplexed connections is detected during communication in said multiplexed connection number detection unit.