| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a data communication system, where traffic on a radio network is lightened by reducing an Ack response. <P>SOLUTION: At a transmission side, an Ack request provided in a radio data frame (DATA) is made effective (ON) for transmission. When Ack to the Ack request is received within a fixed time (timeout time To) in periods P1-P3 for transmitting the Ack request, the period of the Ack request is extended. When the Ack is not received, the period of the Ack request is shortened. At a reception side, only when it is determined that a frame identifier for indicating the order of Ack requests is as expected, and the present value of an Ack request reception interval time is larger than the previous one, the number of redundant transmission times of Ack to the Ack request can be reduced, and the Ack request reception interval time is updated to the present value in any cases. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
