Wireless location messaging
First Claim
1. A wireless location system for locating a mobile-telephone comprising:
- a plurality of base stations associated with cells, each of the base stations having a transmitter for transmitting an audit signal that indicates to a particular mobile-telephone to respond with a confirmation signal, a receiver for receiving the confirmation signal transmitted from the mobile-telephone, and a time indicator for recording a receive time of the confirmation signal; and
a location system that determines a location of the mobile-telephone using the receive times of the confirmation signal at one or more of the plurality of base stations, the location system being operable to cause a base station to transmit the audit signal via a voice overhead channel or a voice channel if the mobile-telephone is in a conversation call state.
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Accused Products
Abstract
The present invention is a wireless location messaging system and method for determining the location of a mobile-telephone in a home or roaming wireless communication system, and in a multitude of call states using an audit signal and a confirmation signal that provides enhanced location accuracy. In one embodiment, the present invention wireless location messaging system is implemented in a wireless communication system comprising a base station for transmitting an audit signal, receiving a confirmation signal transmitted by a mobile-telephone in response to the audit signal and time stamping when the confirmation signal was received, and a location system for determining a location of the mobile-telephone using the receive times of the confirmation signal. The audit signal and the confirmation signal are transmitted using a communication channel that depends on the current call state of the mobile-telephone. Another embodiment of the present invention includes a location register that indicates the wireless communication system last known to serve the particular mobile-telephone. If a second wireless communication system was last known to the serve the particular mobile-telephone, the second wireless communication system is cause to transmit the audit signal, receive the confirmation signal, and time stamp the confirmation signal using its base stations. Subsequently, these receive times are used to determine the location of the particular mobile-telephone.
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Citations
28 Claims
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1. A wireless location system for locating a mobile-telephone comprising:
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a plurality of base stations associated with cells, each of the base stations having a transmitter for transmitting an audit signal that indicates to a particular mobile-telephone to respond with a confirmation signal, a receiver for receiving the confirmation signal transmitted from the mobile-telephone, and a time indicator for recording a receive time of the confirmation signal; and a location system that determines a location of the mobile-telephone using the receive times of the confirmation signal at one or more of the plurality of base stations, the location system being operable to cause a base station to transmit the audit signal via a voice overhead channel or a voice channel if the mobile-telephone is in a conversation call state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17, 18, 20, 22)
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11. A system for locating a mobile-telephone comprising:
a first wireless communication system having a first database containing receive times of at least one signal transmitted by a mobile-telephone signals and received by a plurality of base stations in the first wireless communication system, and last known server information indicating an identity of a wireless communication system last known to serve the mobile-telephone, and a first location system that determines a location of the mobile-telephone using the receive times in the first database if the last known server information indicates the first wireless communication system, wherein the first location system determines the location of the mobile telephone using a second database belonging to a second wireless communication system if the last known server information indicates the second wireless communication system, the second database containing receive times of at least one signal transmitted by the mobile-telephone and received by a plurality of base stations in the second wireless communication system. - View Dependent Claims (12, 13, 14, 15)
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19. A wireless location system for locating a mobile-telephone comprising:
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a plurality of base stations associated with cells, each of the base stations having a transmitter for transmitting an audit signal that indicates to a particular mobile-telephone to respond with a confirmation signal, a receiver for receiving the confirmation signal transmitted from the mobile-telephone, and a time indicator for recording a receive time of the confirmation signal; and a location system that determines a location of the mobile-telephone using the receive times of the confirmation signal at one or more of the plurality of base stations, wherein the location system transmits the location of the mobile-telephone to the mobile-telephone.
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21. A wireless location system for locating a mobile-telephone comprising:
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a plurality of base stations associated with cells, each of the base stations having a transmitter for transmitting an audit signal that indicates to a particular mobile-telephone to respond with a confirmation signal, a receiver for receiving the confirmation signal transmitted from the mobile-telephone, and a time indicator for recording a receive time of the confirmation signal; and a location system that determines a location of the mobile-telephone using the receive times of the confirmation signal at one or more of the plurality of base stations, wherein the location system determines the location of the mobile-telephone using the receive times in the database if the mobile-telephone is not transmitting any signal to at least one of the plurality of base stations.
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23. A method for locating a mobile-telephone in a wireless communication system comprising the steps of:
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transmitting when the mobile-telephone is in a conversation call state over a voice overhead channel or a voice channel an audit signal that indicates to a particular mobile-telephone to respond by transmitting a confirmation signal; receiving the confirmation signal at a plurality of base stations; recording receive times when the confirmation signal arrives at the plurality of base stations; and determining a location of the mobile-telephone using the receive times of the confirmation signal at the plurality of base stations. - View Dependent Claims (24)
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25. A method for locating a mobile-telephone comprising the steps of:
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determining whether a particular mobile-telephone was last served by a first wireless communication system using a first database; and locating the mobile-telephone using receive times of a signal transmitted by the mobile-telephone and received by a plurality of base stations in the first wireless communication if the mobile-telephone was determined to be last served by the first wireless communication system. - View Dependent Claims (26)
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27. A system for locating a mobile-telephone comprising:
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a database containing information identifying a wireless communication system last known to serve a particular mobile-telephone; and a request system for submitting a location request to the wireless communication system identified in the database as being last known to serve the mobile-telephone. - View Dependent Claims (28)
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Specification