| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To efficiently and highly reliably distribute data to a large number of users. <P>SOLUTION: A transmitter 1 transmits data via a broadcasting link 2 consisting of a satellite link, for example. Receivers 3<SB>1</SB>-3<SB>5</SB>receive the data, and verify whether they have successfully received the data. Only when having failed to successfully receive the data, some of the receivers 3<SB>2</SB>, 3<SB>3</SB>and 3<SB>5</SB>, which can transmit information to the transmitter 1, transmit retransmission requests for requesting the retransmission of the data via a communication link 4 consisting of the Internet, for example. When retransmission requests are transmitted, the transmitter 1 receives only the retransmission requests and totals them. In addition, the data requested to be retransmitted are retransmitted, based on the total, via the broadcasting link2 and received by the receivers 3<SB>1</SB>-3<SB>5</SB>. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
