| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the transmission efficiency by excluding a terminal having a deteriorated reception state from members of multicast communication and interrupting the multicast communication, when a state of entire channels is deteriorated. SOLUTION: Upon the receipt of a re-transmission request frame from a reception terminal to a transmission terminal, a reception section 6 of the transmission terminal outputs the retransmission request frame received from an input terminal 5 is outputted to a transmission control section 7. Upon the receipt of the retransmission request frame, the transmission control section 7 counts number of times of re-transmission requests, discriminates the need for transmission control such as exclusion of a reception terminal sending the re-transmission request from members of multicast communication or interruption of the multicast communication, based on the counted value and outputs its discriminated result to a control frame generating section 8. When the transmission control is not conducted, a transmission sequence control section 4 transmits information frame requested by the retransmission request frame again.</p> |
