Route guidance system for provding a mobile station with optimum route data in response to a guidance request together with base station data indicative of an identification of a base station

• US 5,187,810 A
• Filed: 11/27/1991
• Issued: 02/16/1993
• Est. Priority Date: 06/10/1988
• Status: Expired due to Term

• Current Assignee: OKI Electric Industry Company Limited
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Yashiki, Atushi, Yoneyama, Hiroto, Kodama, Toshiyuki
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): FAILE, ANDREW I
• Application Number:
  US07/799,753
• Time in Patent Office: 447 Days
• Field of Search: 455/53-54, 455/56, 455/66-67, 455/34, 455/53.1, 455/54.1, 455/54.2, 455/34.1, 455/34.2, 455/67.1, 455/89, 340/905, 340/988-994, 340/539, 342/457
• US Class Current: 455/509
• CPC Class Codes: G01C 21/3492 employing speed data or traffic data, e.g. real-time or historical traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G1/0968
• CPC Class Codes: G01C 21/3691 Retrieval, searching and output of information related to real-time traffic, weather, or environmental conditions arrangements for giving variable traffic instructions G08G1/09
• CPC Class Codes: G08G 1/096811 where the route is computed offboard
• CPC Class Codes: G08G 1/096844 where the complete route is dynamically recomputed based on new data
• CPC Class Codes: G08G 1/096861 where the immediate route instructions are output to the driver, e.g. arrow signs for next turn
• CPC Class Codes: G08G 1/096872 where instructions are given per voice

Abstract

A mobile telecommunications system includes a plurality of base stations each being communicatable with a mobile station by radio. A telecommunications network accommodates the plurality of base stations for switching communications to the plurality of base stations. A system center is connected to the telecommunications network for selecting an optimum route on the basis of instantaneous traffic conditions. Any of the base stations sends to the mobile station base station data representative of the base station. When the mobile station sends a guidance request for requesting route guidance data, the telecommunications network reports the guidance request to the system center. The system center selects, in response to the guidance request, an optimum route matching instantaneous traffic conditions and transmits optimum route data representative of the optimum route to the mobile station over the telecommunications network.

Claims

1. A mobile telecommunications system for communicating with at least one mobile station, the system comprising:

a plurality of base stations, each corresponding to and establishing a respective miniature zone, each base station being equipped to communicate via an electromagnetic link with the mobile station carried on a vehicle while the vehicle is located in or travelling through the corresponding miniature zone;

a system center for selecting an optimum route along which the vehicle will reach a destination to which the vehicle is directed in the substantially shortest period of time under traffic conditions presently available to said system center; and

a telecommunications network configured for bi-directional communications between said system center and said plurality of base stations;

each of said base stations having a respective first identification allotted specifically thereto and being equipped to transmit base station data including its respective first identification to mobile stations located in or travelling through the miniature zone corresponding to the base station;

said system center producing optimum route data for subsequent transmission to one or more of said plurality of base stations which the vehicle will pass as it travels along the route to said destination, said optimum route data representative of the optimum route in the form of the first identifications which correspond to said one or more of said plurality of base stations;

said mobile station being equipped, while the vehicle carrying said mobile station is located in or travelling through any of said miniature zones, to transmit mobile station data and a guidance request signal asking for said optimum route data, to receive said optimum route data, to receive said base station data from the base station corresponding to the miniature zone in which the mobile station is located or through which it is passing, to compare said optimum route data with said base station data that it has received, to transmit the guidance request signal if the comparison indicates that the vehicle has left a selected optimum route, and to output or indicate selected optimum route data so as to enable the vehicle to be guided along the selected optimum route to the destination,

each said base station being responsive to the receipt of the guidance request signal to retransmit the guidance request signal to said telecommunications network;

said telecommunications network being responsive to receipt of the guidance request signal to report the guidance request signal together with said mobile station data to said system center;

said system center selecting, in response to receipt of the guidance request signal, the optimum route for the vehicle based on the traffic conditions and the transmitted mobile station data, and transmitting or communicating said optimum route data representative of said selected optimum route to said telecommunications network for further transmission to said mobile station over said electromagnetic link, while the vehicle carrying said mobile station is located in or travelling through any said miniature zone,

said system center also updating said optimum route data for the vehicle based on traffic conditions and transmitting the updated optimum route data to said telecommunications network for further transmission to said mobile station over said electromagnetic link while the vehicle carrying said mobile station is located in or travelling through any said miniature zone.

2. A system in accordance with claim 1, wherein after receiving the guidance request signal, said system center transmits or communicates the optimum route data representative of said optimum route to said telecommunications network for further transmission to said mobile station over the electromagnetic link, while the vehicle carrying said mobile station is in one of the miniature zones, and stores the optimum route data transmitted to the mobile station for updating at a later time,

said system center being able to update traffic data based on traffic conditions received from said telecommunications network, and

said system center being able to determine when the optimum route data for the mobile station should be updated due to a change in the traffic conditions, and then selecting a new optimum route for the mobile station on the basis of the updated traffic data and then to transmit new updated optimum route data to said telecommunications network for further transmission to the mobile station over said electromagnetic link, while the vehicle carrying said mobile station is in a miniature zone established by a base station along the route to the destination.

3. A system in accordance with claim 1, wherein said system center produces route command data, in the form of a message directing the vehicle along the selected optimum route,

said system center transmitting, in response to the guidance request signal, the optimum route data, which includes the route command data, to said telecommunications network for further transmission to said mobile station over said electromagnetic link, while the vehicle carrying said mobile station is located in or passing through one of the miniature zones.

4. A system in accordance with claim 1, wherein said electromagnetic link comprises a radio link, and wherein each of said plurality of base stations is equipped to transmit communications and receive communications over said radio link to and from said mobile station, while the vehicle carrying said mobile station is located in or travelling through the corresponding miniature zone established by said base station, said plurality of base stations using a single frequency of an electromagnetic wave between geographically adjoining ones of said plurality of base stations, said plurality of base stations transmitting and receiving communications using the single frequency;

geographically adjoining ones of said plurality of base stations being spaced apart from each other with an area intervening between them in which area said mobile station is substantially not responsive to the electromagnetic wave on said radio link;

the single frequency of the electromagnetic wave being available to the mobile station in each of said miniature zones, each of said miniature zones being of such a size that only a portion of the base station data and optimum route data is transmitted from a corresponding one of said plurality of base stations to said mobile station while said mobile station is located in or travelling through the miniature zone established by said one base station, and another portion of the base station data and optimum route data is transmitted while said mobile station is in another miniature zone established by another one of said base stations along the route to the destination;

whereby said adjoining base stations are allowed to share the single frequency of the electromagnetic wave to transmit the base station data and the optimum route data to said mobile station intermittently while said mobile station moves across said miniature zones.

5. A system in accordance with claim 3, wherein the mobile station outputs, upon receiving the optimum route data and upon receiving the base station data from one of said plurality of base stations which is associated with the optimum route data, a portion of the message of said route command data.

6. A mobile station to be carried on a vehicle for use in a mobile telecommunications sytem, said system having a plurality of base stations each corresponding to a respective miniature zone, each base station being equipped to transmit communications and receive communications via an electromagnetic wave to and from said mobile station while the vehicle carrying said mobile station is located in or travelling through the corresponding miniature zone, a telecommunications network interconnecting said plurality of base stations for bi-directional communications therewith, a system center interconnected to said telecommunications network for bi-directional communications therewith, said system center selecting, in response to a guidance request signal asking for route guidance data, an optimum route along which said vehicle should take to reach a destination to which the vehicle is directed in the substantially shortest period of time under traffic conditions presently available to said system center, and said system center transmitting or communicating to said telecommunications network optimum route data representative of said optimum route for further transmission to said mobile station, while the vehicle carrying said mobile station is located in or travelling through any of said miniature zones, each one of said plurality of base stations having a respective identification and being equipped to transmit base station data representative of the identification, said mobile station comprising:

receiving means interconnected to a controller for receiving the base station data and the optimum route data and for comparing the optimum route data with the base station data, and for transmitting a new guidance request signal if the comparison indicates that the vehicle has left a selected optimum route, while the vehicle carrying said mobile station is located in or travelling through one of the miniature zones;

outputting means interconnected to said receiving means for outputting a message representative of the optimum route data and the base station data so as to enable the vehicle to be guided along the selected optimum route to the destination;

inputting means for producing the guidance request signal; and

transmitting means interconnected to said inputting means for transmitting mobile station data for notifying the system center of the location and destination of the vehicle and the guidance request signal on said electromagnetic link, while the vehicle carrying said mobile station is located in or travelling through one of the miniature zones;

wherein each one of said plurality of base stations is responsive to receipt of said guidance request signal thereby to transmit it to said telecommunications network, said telecommunications network reports said guidance request to said system center, said system center selects the optimum route and updates the optimum route for the vehicle based on traffic conditions, and transmits the optimum route data and the updated optimum route data to said telecommunications network for further transmission to said mobile station over said electromagnetic link, while the vehicle carrying said mobile station is located in or travelling through one of the miniature zones located along the route to the destination.

7. A mobile station in accordance with claim 6, wherein said system center produces route command data, in the form of a message, directing the vehicle along the selected optimum route, said system center transmitting, in response to the guidance request, the optimum route data, which includes the route command data, and, in response to the notification of location and destination of the vehicle, new optimum route data corresponding to said updated optimum route data to said telecommunications network for further transmission to said mobile station over said electromagnetic link, while the vehicle carrying said mobile station is located in or travelling through one of the miniature zones,

said receiving means receiving the base station data and the optimum route data, and said outputting means being operative, in response to said base station data and said optimum route data, to output the message representative of said base station data together with said optimum route data.

8. A mobile station in accordance with claim 6, wherein said electromagnetic wave comprises a radio wave forming a radio link, said transmitting means uses a single frequency of the electromagnetic wave of said radio link to transmit and receive between geographically adjoining ones of said plurality of base stations, said plurality of base stations transmitting and receiving communications with which the single frequency is modulated, geographically adjoining ones of said plurality of base stations being spaced apart from each other with an area intervening between them in which said mobile station is substantially not responsive to the electromagnetic wave on said radio link, each of said plurality of base stations establishing the miniature zone in which the single frequency of the electromagnetic wave is available to said mobile station, each of said miniature zones being of such a size that only a portion of the base station data and the optimum route data is transmitted to said mobile station while said mobile station passes through a corresponding one of said miniature zones;

said receiving means being responsive to the single frequency of the electromagnetic wave; and

said transmitting means modulating the single frequency with data representative of the guidance request signal;

whereby said adjoining base stations are allowed to share the single frequency of the electromagnetic wave to transmit the base station data and the optimum route data to said mobile station intermittently while said mobile station moves across said miniature zones.

9. A mobile station in accordance with claim 7, wherein, in response to said receiving means receiving the optimum route data, the new updated optimum route data, and the base station data, said outputting means outputs only a portion of the message of said route command data which portion is associated with the one base station which has established the miniature zone through which the vehicle carrying the mobile station is passing.

10. A mobile station in accordance with claim 6, wherein said outputting means visually outputs the optimum route data and the updated optimum route data received from said plurality of base stations.

11. A mobile station in accordance with claim 6, wherein said outputting means produces an audible signal representative of the optimum route data and the updated optimum route data received from said plurality of base stations.

12. A mobile station in accordance with claim 6, wherein said outputting means comprises a vocoder.

13. A mobile station in accordance with claim 6, wherein said outputting means comprises a video display.

14. A mobile station in accordance with claim 6, wherein said outputting means comprises a facsimile receiver set.

15. A mobile station in accordance with claim 6 wherein said outputting means comprises a vocoder, a video display, and a facsimile receiver set.

16. A mobile station in accordance with claim 6, wherein said inputting means comprises a key input unit.

17. A mobile station in accordance with claim 6, wherein said inputting means comprises a speech recognizer unit.

18. A mobile station in accordance with claim 6, wherein said inputting means comprises a facsimile transmitter set.

19. A mobile station in accordance with claim 6, wherein said inputting means comprises a key input unit, a speech recognizer unit, and a facsimile transmitter set.

20. A method for communicating with at least one mobile station, said method comprising the steps of:

transmitting mobile station data and a guidance request signal asking for optimum route data from said mobile station to a plurality of base stations, each base station corresponding to a miniature zone, each base station equipped to transmit communications and receive communications on an electromagnetic wave link to and from the mobile station carried on a vehicle while the vehicle is located in or travelling through said corresponding miniature zone, each of said base stations having a respective first identification allotted specifically thereto, each base station being equipped to transmit base station data representative of the first identification;

transmitting, by said plurality of base stations, said guidance request signal to a telecommunications network;

transmitting, by said telecommunications network, said guidance request signal together with a second identification to a system center;

producing, by said system center, optimum route data representative of an optimum route in the form of the first identification of one or more of said plurality of base stations which the vehicle will pass along the route to a destination to which the vehicle is directed in the substantially shortest period of time under traffic conditions presently available to said system center, and selecting, in response to the guidance request signal, the optimum route for the vehicle based on the traffic conditions and the transmitted mobile station data, and transmitting the optimum route data representative of said selected optimum route to said telecommunications network for further transmission to said mobile station over said link, while the vehicle carrying said mobile station is located within or travelling through one of the miniature zones; and

updating, by said system center, said optimum route data for the vehicle based on traffic conditions and transmitting the updated optimum route data to said telecommunications network for further transmission to said mobile station over said link while the vehicle carrying said mobile station is located within or travelling through any of said miniature zones,

wherein said mobile station receives said optimum route data, receives said base station data from the base station corresponding to the miniature zone in which the mobile station is located or through which it is passing, compares said optimum route data with said base station data that it has received, transmits the guidance request signal if the comparison indicates that the vehicle has left said selected optimum route, and outputs or indicates the selected optimum route data so as to enable the vehicle to be guided along the selected optimum route to the destination.

21. A method in accordance with claim 20 further comprising the steps of said system center:

storing the optimum route data transmitted to the mobile station for updating at a later time;

updating traffic data based on traffic conditions received from said telecommunications network;

determining when the optimum route data for the mobile station should be updated due to a change in the traffic conditions, and then selecting a new optimum route for the mobile station on the basis of the updated traffic data; and

transmitting new updated optimum route data to said telecommunications network for further transmission to the mobile station over said link, while the vehicle carrying said mobile station is located in or passing through a miniature zone established by a base station along the route to the destination.

22. A method in accordance with claim 20 further comprising the steps of said system center:

producing route command data in the form of a message directing the vehicle along the selected optimum route; and

transmitting, in response to the guidance request signal, the optimum route data, which includes the route command data, to said telecommunications network for further transmission to said mobile station over said link, while the vehicle carrying said mobile station is located in or passing through one of the miniature zones.

23. A method in accordance with claim 22 further comprising the step of the mobile station:

outputting, upon receiving the optimum route data and upon receiving the base station data from one of said plurality of base stations which is associated with the optimum route data, a portion of the message of said route command data which is associated with said one base station.

24. A method for communicating with a mobile station to be carried on a vehicle for use in a mobile telecommunications system, said method comprising the steps of said mobile station:

producing a guidance request signal asking for route guidance data;

transmitting mobile station data for notifying one of a plurality of base stations of the location and destination of the vehicle and said guidance request signal on an electromagnetic wave link, while the vehicle carrying said mobile station is in a miniature zone established by said one base station, said one base station receiving said guidance request signal and transmitting said guidance request signal to said telecommunications network, said telecommunications network reporting said guidance request to said system center, said system center selecting an optimum route along which said vehicle should take to reach the destination to which the vehicle is directed in the substantially shortest period of time under traffic conditions presently available to said system center and updating the optimum route for the vehicle based on traffic conditions and transmitting the optimum route data and the updated optimum route data to said telecommunications network for further transmission to said mobile station over said link, the vehicle carrying said mobile station receiving said optimum route data or updated route data while the mobile station is located in or passing through any of the miniature zones established by said base stations along the route to the destination;

receiving base station data and the optimum route data from said one of said plurality of base stations;

comparing said optimum route data with said base station data;

transmitting a new guidance request signal if the comparison indicates that the vehicle has left the selected optimum route, while the vehicle carrying said mobile station is in any one of the miniature zones; and

outputting a message representative of said optimum route data and said base station data so as to enable the vehicle to be guided along the selected optimum route to the destination.

25. A method in accordance with claim 24 wherein said system center produces route command data, in the form of a message, directing the vehicle along the selected optimum route, and transmits, in response to the guidance request signal, the optimum route data, which includes the route command data, and, in response to the notification of the location and the destination of the vehicle, new optimum route data corresponding to the updated optimum route data to said telecommunications network for further transmission to said mobile station over said link, while the vehicle carrying said mobile station is located in or passing through any of the miniature zones.

26. A method in accordance with claim 24 further comprising the step of outputting, in response to receiving the optimum route data, new updated optimum route data corresponding to the updated optimum route data and base station data while the vehicle carrying said mobile station is located in or passing through any said miniature zone from a corresponding one of the plurality of base stations which is associated with the optimum route data, a portion of the message of said route command data which is associated with said one base station.

27. A method in accordance with claim 24 further comprising the step of visually outputting or indicating the optimum route data and the new updated optimum route data received from said plurality of base stations.

28. A method in accordance with claim 24 further comprising the step of producing an audible signal representative of the optimum route data and the new updated optimum route data received from said plurality of base stations.