| 摘要 |
PROBLEM TO BE SOLVED: To reduce variations in power consumption of a plurality of wireless units, caused by a difference in the number of times of communication in a communication system which connects wirelessly the wireless units having an intermittent receiving function in a hierarchical structure. SOLUTION: The system has a hierarchical structure in which three wireless slave units 3 to 5 exist under a wireless master unit 2, two wireless slave units 4 and 5 exist under the wireless slave unit 3, and one wireless slave unit 5 exists under the wireless slave unit 4. Wireless units at higher-order positions in the hierarchical structure relay data from wireless units at lower-order positions to ones at higher-order positions. The intermittent receiving interval of wireless units at higher-order positions having an increased number of times of communication is made longer than that of wireless units at lower-order positions. COPYRIGHT: (C)2009,JPO&INPIT
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