Mobile unit communication control method

Details Mobile unit communication control method Mobile unit communication control method

1996-10-04

1998-06-23

Hofsass, Jeffery

Communications: electrical

External condition vehicle-mounted indicator or alarm

Highway information

340901, 340991, 340928, 235384, G08G 109

Patent

active

057710082

ABSTRACT:
A mobile unit communication control method is for exchanging information accurately between a plurality of responders and a questioner in a communication area without information drop-off. A ground unit constituting the questioner transmits an inquiry signal. A vehicle-mounted unit constituting the responder stores and returns the current time the vehicle-mounted unit first received the inquiry signal as a starting time. The ground unit selects a vehicle-mounted unit with the earliest starting time as an object of communication among a plurality of the vehicle-mounted units. A vehicle-mounted unit expected to pass the communication area at the earliest time is selected, and the ground unit transmits a response signal for handshaking with the particular vehicle-mounted unit, to which the vehicle-mounted unit replies. With the establishment of the handshake, data are exchanged between the ground unit and the vehicle-mounted unit.

REFERENCES:
patent: 4408179 (1983-10-01), Matsumura
patent: 5089815 (1992-02-01), Potter et al.
patent: 5406275 (1995-04-01), Hassett et al.
patent: 5581249 (1996-12-01), Yoshida

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