초록 ▼

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 comm

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.

대표청구항 ▼

[ What is claimed is:] [1.] A satellite broadcast communication system in which a host station sends data packet signals to a plurality of terminal stations via a communications satellite comprising:broadcast schedule transmission means, disposed in the host station, for transmitting a broadcast sch

[ What is claimed is:] [1.] A satellite broadcast communication system in which a host station sends data packet signals to a plurality of terminal stations via a communications satellite comprising:broadcast schedule transmission means, disposed in the host station, for transmitting a broadcast schedule that defines titles and transmission times for a plurality of transmission data;composite information transmission means, disposed in the host station, for transmitting the plurality of transmission data in form of data packets at the respective transmission times according to said broadcast schedule;broadcast schedule reception means disposed in each of the terminal stations, for receiving said broadcast schedule;desired information reception means, disposed in each of the terminal stations, for receiving desired transmission data at a particular scheduled transmission time described in the broadcast schedule received by said broadcast schedule reception means, selectively from the plurality of transmission data sent form said composite information transmission means in the form of data packets;vacant time slot detection means, disposed in the host station, for searching said broadcast schedule and thereby detecting vacant time slots during which no data transmission is scheduled;broadcast schedule generation means, disposed in the host station, for rearranging said broadcast schedule so that said detected vacant time slots are used to send retransmission data duplicating the transmission data once transmitted by said composite information transmission means; andwherein said broadcast schedule transmission means transmits said broadcast schedule rearranged by said broadcast schedule generation means to said broadcast schedule reception means in the respective terminal stations, and said composite information transmission means transmits the retransmission data to said broadcast schedule reception means in addition to the plurality of transmission data according to said broadcast schedule rearranged by said broadcast schedule generation means.