| 摘要 |
<P>PROBLEM TO BE SOLVED: To supply a technique of reducing an effect of jam radio waves. <P>SOLUTION: A frame containing plural slots is repetitively defined, and a selecting unit 44 selects any one of plural slots contained in a frame. A processor 26 broadcasts a control packet signal containing information concerning a frame by using the selected slot. A receiver 40 receives a data packet signal which is synchronized in frame timing with the broadcasted control packet signal and broadcasted from a terminal device. An estimating unit 42 estimates the precision of the frame timing synchronization in the terminal device on the basis of the received data packet signal, and estimates the broadcasting status of the control packet signal on the basis of the estimated precision. <P>COPYRIGHT: (C)2012,JPO&INPIT |
