Patent ID: 7693033

Claim:
A radio apparatus, comprising: a control unit adapted to allocate channels respectively for a plurality of terminal apparatuses by using space division multiplexing; and a signal processing unit adapted to perform a data transmission processing on received signals from the terminal apparatuses, wherein said control unit is adapted to determine the number of terminal apparatuses to which permission is given for access by using space division multiplexing, in accordance with the data transmission rate per channel of the terminal apparatus to be connected, said signal processing unit is adapted to compute a received response characteristic, based on a signal received from the terminal apparatus, said control unit comprises: a correlation computing unit adapted to compute a value of correlation between received response characteristics corresponding to the plurality of terminal apparatuses multiplexed by a space division multiplexing access; and a channel allocating unit which has means for performing the space division multiplexing access, within a range of the number of terminal apparatuses to which permission is given for access, if the value of correlation is less than or equal to a threshold value and which has means for performing different multiplexing from the space division multiplexing access if the value of correlation is greater than the threshold value, there are arranged a plurality of channels to which the plurality of terminal apparatuses are respectively allocated within a plurality of slots which are provided by a different multiplexing access from the space division multiplexing access, and said control unit further comprises: an input unit adapted to input a request by which to change a data transmission rate of a predetermined terminal apparatus; and a channel allocating unit adapted to instruct a change of the data transmission rate in a request-applied terminal apparatus and adapted to relocate the channels among different slots so that the number of channels allocated within the respective slots is less than or equal to the number of terminal apparatuses to which permission is given for access even if the data transmission rate in the request-applied terminal apparatus has been changed.