Mobile unit communication control method
First Claim
1. A mobile unit communication control method for exchanging information by radio communication between responders respectively mounted on each of a plurality of mobile units moving on the ground surface and a questioner having a communication area for radio communication with the responders and installed on the ground, said method comprising the steps of:
- causing each of said responders to respectively transmit status information representing the status thereof in said communication area; and
causing said questioner to estimate the time each of the responders is expected to pass the communication area on the basis of the status information sent from each of said responders and determine the one of said responders estimated to pass the communication area at the earliest time as an object of communication.
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Accused Products
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.
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Citations
20 Claims
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1. A mobile unit communication control method for exchanging information by radio communication between responders respectively mounted on each of a plurality of mobile units moving on the ground surface and a questioner having a communication area for radio communication with the responders and installed on the ground, said method comprising the steps of:
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causing each of said responders to respectively transmit status information representing the status thereof in said communication area; and causing said questioner to estimate the time each of the responders is expected to pass the communication area on the basis of the status information sent from each of said responders and determine the one of said responders estimated to pass the communication area at the earliest time as an object of communication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile unit communication control method for exchanging information by radio communication between responders respectively mounted on each of a plurality of mobile units moving on the ground surface and a questioner having a communication area for radio communication with said responders and installed on the ground, said method comprising the steps of:
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causing each of said responders to respectively determine the status information representing the status thereof in said communication area and respectively transmit the status information thus determined; and causing said questioner to estimate the time each of the responders is expected to pass the communication area on the basis of said status information sent from each of said responders and determine the one of said responders expected to pass the communication area at the earliest time as an object of communication. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A mobile unit communication control method for exchanging information by radio communication between responders respectively mounted on each of a plurality of mobile units moving on the ground and a questioner having a communication area for radio communication with said responders and installed on the ground, said method comprising the steps of:
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causing each of said responders to respectively return at least received information as it is; and causing said questioner to transmit communication time information representing the time of communication from said questioner, confirm the temporal order of the communication indicated by said communication time information included in the information respectively returned from each of said responders, and determine the one of responders that has returned the oldest communication time information as an object of communication on the basis of the confirmation. - View Dependent Claims (18, 19, 20)
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Specification