| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the probability that the battery service life of a child node becomes shorter than its expected lifetime. <P>SOLUTION: A parent node 1 includes: a signal receiving unit 10 for receiving a parent node search signal transmitted by a child node 2; an RSSI measurement unit 11 for measuring an RSSI that is an index indicating intensity of a wireless link between the child nodes 2, that transmits the parent node search signal and the parent node 1; a reply-wait time standby process unit 13 for transmitting a response signal to the child node 2, that is a transmission source of the parent node search signal after the standby time has passed that is a reply waiting time corresponding to the intensity of the wireless link; and a signal transmission unit 14. The child node 2 includes a signal transmission unit 20 for transmitting the parent node search signal; a signal reception unit 21 for receiving the response signal; and a parent node selection unit 22 for selecting the parent node 1, that communicates with own node, at all times, based on the waiting time from the transmission of the parent node search signal to the reception of the response signal. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
