| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a transmitter to calculate RTT by reducing a load on a network. <P>SOLUTION: An RTP generation part 72 of a server 12 generates a plurality of RTP packets in each of which sequence numbers expressing an order to be reproduced as streaming data are stored, reorders one of the plurality of RTP packets to an order different from the order to be reproduced, supplies the RTP packet to a transmitting part 81 and causes the transmitting part 81 to transmit it to a client. An RTT calculation part 76 calculates RTT (Round Trip Time) from the current time and transmitting time of the reordered RTP packet when a sequence number stored in an NACK packet expressing a re-transmission request of the RTP packet transmitted from the client coincides with a sequence number of the reordered RTP packet. This invention is applicable, for example, to a system for transmitting/receiving data by controlling transmission rate. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
