Fujitsu Corporation

Hironobu Igarashi

Yuji Kuroda

Katsutoshi Inoko

Each mobile station is accommodated in a base station through a radio transmission path. A base station control device controls each base station. A mobile station is accommodated in a first base station. Each of the base stations notifies the mobile station of the condition of the communication resources of the base station, respectively. If the mobile station judges that it is advantageous to be accommodated in a second base station instead of the first base station, the mobile station makes a request for hand-off to the base station control device. The base station control device issues a hand-off command to both of the first and second base stations. Then, the mobile station is accommodated in the second base station.

Mobile communication system in which communication resources are allocated based on traffic congestion

Mobile communication system for performing hand-off based on communication resources in base stations

A subscriber station of a subscriber radio system, wherein a plurality of subscriber stations communicate with a base station through a time division multiplexed radio wave, includes an open-loop frequency control device for determination of a time slot to communicate with the base station. An oscillating frequency of a generator included in the open-loop is selected depending on a transmitting frequency from the base station from among a plurality of frequencies which can be set so that the time slot determined based on one of the plurality of frequencies does not overlap other time slots assigned to other subscriber stations.

Growing community of inventors

Kawasaki, Japan

Hironobu Igarashi