Communications: electrical – Traffic control indicator – Combined
Patent
1996-02-15
1996-12-03
Hofsass, Jeffery
Communications: electrical
Traffic control indicator
Combined
340933, 340937, 235384, 235492, G80G 100, G80G 1065
Patent
active
055812490
ABSTRACT:
A mobile communication system for highway toll charging and the like includes road-side units which periodically poll vehicle-mounted units. When traffic near a road-side unit is slow, repeated polling of a given vehicle-mounted unit that has not moved out of the road-side unit's communicable area may result in erroneous double charging of a toll. It is possible to set a fixed delay in the vehicle-mounted unit to avoid this; in this case, however, a toll may erroneously not be charged if the vehicle passes through the same or another road-side unit within the delay period. To solve this problem, the road-side unit calculates a response delay having a length appropriate to avoid the above-described effects based on the speed of vehicles passing it and transmits the response delay to the vehicle-mounted units.
REFERENCES:
patent: 5101200 (1992-03-01), Swett
patent: 5144553 (1992-09-01), Hassett et al.
patent: 5212373 (1993-05-01), Fujioka et al.
patent: 5378887 (1995-01-01), Kobayashi
patent: 5406275 (1995-04-01), Hassett et al.
Hofsass Jeffery
Nippondenso Co., Ltd
Trieu Van T.
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