| 摘要 |
<p>Data packets (P(1) to P(8)) transmitted from a route station (1) are received BY a plurality of leaf stations (A to C). The data packets (P (1) to P (8)) contain a data block (B(101)) having an error correction code. The data packets (P(1) to P(8)) contain re-transmission request voice right information (L(201), L(202) to L(801), and L(802)) to give two of the leaf stations (A to C) the re-transmission request voice in one communication cycle. The leaf stations (A to C) requests the route station (1) for the re-transmission of a data block containing an error which could not be corrected in the communication cycle in which the re-transmission request voice is given, by sending re-transmission request packets (LA(1), LB(1) and LC(1)). The route station (1) transmits the data packet containing the request data block in the next and subsequent communication cycles. Therefore, it is possible to transmit data efficiently from a transmitting station to a receiving station without using the band uselessly and to transmit the data again, meeting the requests of a plurality of receiving stations.</p> |
