| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform time synchronization in frequency hopping data communication from a master station over wide range beyond the communication range of the master station, without installing a plurality of master stations. <P>SOLUTION: In this time synchronization in the frequency hopping data communication, the master station comprises the steps of periodically transmitting frequency-hopping time information to each node; updating a self-timer for frequency hopping to the time information, when each node receives the time information; transmitting the received frequency hopping time as each relay transmission node, when each node receives the time information; updating its own timer for frequency hopping to the time information, when each node outside the communication range of the master receives the time information from each relay transmission node; and transmitting the received frequency-hopping time as each relay transmission node, when each node outside the communication range of the master receives the time information. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
