Fujitsu Corporation

Hideki Hieida

Hisao Kawano

Koichiro Takeda

Saburo Tanaka

Kazuhiro Okada

The network system of the present invention comprises a plurality of base transceiver stations, a plurality of antenna systems, and a radio-channel connection controller. The radio-channel connection controller comprises a connection switching unit switching the connection between the plurality of base transceiver stations and the plurality of antenna systems, and a switching control unit controlling the connection switching of the connection switching unit according to a loaded state of the network.

Radio-channel connection controller and mobile communication network system

A satellite broadcast communications system, in which a host station sends packet-multiplexed signals to a plurality of terminal stations via a communications satellite, specifically improving efficiency in data retransmission operations without sacrificing the channel capacity of the satellite communications link. Broadcast schedule transmission means transmits the broadcast schedule, which contains the title and transmission time of each transmission data, to every terminal station via the communications satellite. Based on the broadcast schedule, composite information transmission means broadcasts various data to the terminal stations. Broadcast schedule reception means receives the broadcast schedule, and based on the received broadcast schedule, desired information reception means selectively receives desired information at the scheduled transmission time. Further, vacant time slot detection means examines the broadcast schedule to find vacant time slots in which no transmission is scheduled, and broadcast schedule production means rearranges the broadcast schedule so that the data once transmitted be retransmitted in those vacant time slots.

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Kawasaki, Japan

Hideki Hieida