Hitachi-kokusai Electric Inc.

Hiroyo Sato

Hiroyuki Murakami

Kenya Uedo

In a wireless communications system, a base station unit covers a plurality of communications station units and downlink and uplink communication between the base station unit and the communications station unit are wireless. Each of the communications station units covered by the base station unit is assigned to one of a plurality of groups that perform receiving or sending in the same time band. Each group's communication time band is made different for downlink and uplink communication. The downlink communication and uplink communication between the base station unit and plurality of communications station units is performed in time-division multiplexing regarding each of the plurality of groups to achieve a good assignment of groups. At the time of group assignment, the total amount of sending and receiving are adjusted for each group based on the traffic situation in order to reduce the empty time in downlink communication and uplink communication.

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Tokyo, Japan

Hiroyo Sato