| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent transmission radio waves from colliding with each other between adjoining systems, as to systems for transmitting time by wireless from a master device to slave devices. <P>SOLUTION: The master device 2 of each wireless system 1 transmits time information while each of the slave devices 3 corrects own clocking time based on the time information and sets, as an own rank, a rank obtained by adding 1 to the rank of the device of a transmission origin. The slave devices 3 transmit time information used for correcting time of a slave device 3 of a rank lower than its own one at a time determined by its own rank and by individual recognition number. Since a plurality of wireless communication systems 1 are adjacently set, devices of the same individual recognition number are disposed at the same rank. In cases where radiowaves simultaneously transmitted by them collide and interfere with each other, the rank of the master device 2 of one wireless communication system 1 is changed by a rank offset setting part. This changes also the rank of slave devices 3 subject to their master device 2. Collision or interference does not happen when any devices of the same rank/the same recognition number do not exist or they become distant to a degree that a radiowave does not reach them. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
