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...

Full description

Saved in:
Bibliographic Details
Main Authors IKEZAWA MASATO, KAWASAKI HIROAKI, ITO TETSUHITO
Format Patent
LanguageEnglish
Published 10.06.2013
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
TRANSMISSION
Online AccessGet full text

Cover

More Information
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).
Bibliography:Application Number: JP20110258051