Navigation information system
First Claim
1. A navigation information system for providing information to one or more mobile users dependent on their locations, the system comprising:
- means for determining the location of a mobile unit requesting guidance information,means for generating information for guidance of the user of the mobile unit according to the present location of the mobile unit,and a communications system for transmitting the guidance information so generated to the mobile unit,wherein the navigation information system has means for communicating with the mobile unit using dual tone multi-frequency (DTMF) signals.
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Abstract
A navigation information system includes a communications system having a fixed part and at least one mobile part, the fixed part including data storage and processing for identifying the location of a mobile unit, generating guidance information appropriate to that location and transmitting it to the mobile unit. By locating most of the complexity with the service provider, in particular the navigation computer and geographical database, the system can be readily updated and the capital cost of the in-vehicle system, which in its simplest form may be a standard cellular telephone, can be minimized. The user makes a request for guidance information, and the system, having determined the user'"'"'s present location, then transmits instructions to the user. The user'"'"'s present location can be determined by a Satellite Positioning System.
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Citations
25 Claims
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1. A navigation information system for providing information to one or more mobile users dependent on their locations, the system comprising:
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means for determining the location of a mobile unit requesting guidance information, means for generating information for guidance of the user of the mobile unit according to the present location of the mobile unit, and a communications system for transmitting the guidance information so generated to the mobile unit, wherein the navigation information system has means for communicating with the mobile unit using dual tone multi-frequency (DTMF) signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile unit for a navigation information system, comprising:
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means for identifying the present position of the mobile unit, means for transmitting to a co-operating fixed part, over a communications link, information relating to the present location of the mobile unit, guidance instruction means controllable by guidance instruction information received over the communications link, whereby guidance instructions related to the present location can be communicated to a user by means of the guidance instruction means, and means for communicating with the co-operating fixed part using dual tone multi-frequency (DTMF) signals. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method of providing navigation guidance information to mobile units of a mobile radio system, the information being dependent on the locations of the mobile units, the method comprising the steps of:
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transmitting, from a mobile unit to a fixed part, a request for navigation guidance; determining the location of the mobile unit; generating guidance information on the basis of the location information and navigation data stored in the fixed part; and transmitting the guidance information from the fixed part to the mobile unit; at least part of the data transmitted to and from the mobile unit being in the form of DTMF signals. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification