RADIO TAG SYSTEM
PROBLEM TO BE SOLVED: To reduce power consumption of a radio tag which transmits identification information at predetermined time intervals without reducing radio tag monitoring accuracy at a receiver side in a system comprising the radio tag.SOLUTION: A radio tag determines, when tag information is...
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Main Authors | , , |
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Format | Patent |
Language | English |
Published |
10.06.2013
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Subjects | |
Online Access | Get full text |
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Summary: | PROBLEM TO BE SOLVED: To reduce power consumption of a radio tag which transmits identification information at predetermined time intervals without reducing radio tag monitoring accuracy at a receiver side in a system comprising the radio tag.SOLUTION: A radio tag determines, when tag information is transmitted (S110), whether or not a response signal from a receiver can be received (S130) and if the response signal cannot be received, a standard standby time T2 is set as a transmission interval until next transmission of the tag information (S140). Furthermore, when the response signal is being received, a reception level L1 of tag information at a receiver side and a reception level L2 of the response signal at a radio tag side are acquired, and variations L1 and L2 from previous values of these levels are calculated (S160). In the case where both the variations L1 and L2 are equal to or more than a threshold value, a minimum standby time T1 (< T2) is set as the transmission interval (S180) but if not, a maximum standby time T3 (> T2) is set as the transmission interval (S190). |
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Bibliography: | Application Number: JP20110258051 |