| 摘要 |
<P>PROBLEM TO BE SOLVED: To download data of a high-capacity file from a server (an access point) to a client (a portable device) of a user at a high speed with efficiently using both millimeter wave wireless communication and the conventional wireless communication (WiFi, Bluetooth (R), 3G, and the like). <P>SOLUTION: File data is packetized and transmitted from a server to a client. The file data is transmitted as a data packet by a millimeter wave. In parallel to that, a check-out packet (a roll-calling packet) corresponding to the data packet is transmitted. At establishment of a link, a latency of each communication channel is measured for testing. On a reception side, when reception of the check-out packet is completed, whether or not a millimeter wave packet corresponding to the check-out packet is arrived is checked (or roll-calling is performed). If no corresponding millimeter wave packet is arrived, it is determined that the corresponding millimeter wave packet is lost, and a retransmission request is returned to the server readily via WiFi. <P>COPYRIGHT: (C)2012,JPO&INPIT |
