Communications: electrical – Traffic control indicator – Combined
Patent
1997-01-17
1999-01-26
Hofsass, Jeffery A.
Communications: electrical
Traffic control indicator
Combined
340933, 340937, 34082531, G08G 100
Patent
active
058643060
ABSTRACT:
Data transmissions between a transponder and a reader of a toll collection system are minimized while the transponder moves through a communication zone of the system. A plurality of dimensionally programmable detection regions, are defined within the communication zone. Detection criteria are also defined that indicate whether the transponder transitions into, out of, or both into and out of one of a plurality of "in" detection regions. Then it is determined if the current geolocation of the transponder is within any of the detection regions. The current location of the transponder is compared to the previous location of the transponder. If a change in the location of the transponder occurs and one of the detection criteria has been met, a detection region report message is generated. The detection region report message is sent to an application processor for processing, and if the transponder moves out of any of the "in" detection regions, the application processor drops the communications link to that transponder. This minimizes the amount of processing and data transfer between the transponders and the reader and processor.
REFERENCES:
patent: 5101200 (1992-03-01), Swett
patent: 5283573 (1994-02-01), Takatou et al.
patent: 5406275 (1995-04-01), Hassett et al.
patent: 5640156 (1997-06-01), Okuda et al.
patent: 5686906 (1997-11-01), Ono et al.
patent: 5710556 (1998-01-01), Nishimura et al.
Dwyer Douglas
Feitelson Stephen J.
Kramp, II Robert H.
Lim Patrick P.
Grunebach Georgann S.
Hofsass Jeffery A.
Raytheon Company
Trieu Van T.
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