TDOA/GPS hybrid wireless location system
First Claim
1. A method for determining the location of a mobile station (MS) equipped with embedded GPS signal reception capability and equipped to operate within a wireless communications network (WCN), the method comprising:
- using a serving cell site of the WCN, providing assistance data to the MS to be located, said assistance data enhancing an ability of the MS to receive GPS signals and extract time of arrival (TOA) or pseudorange measures;
at the serving cell site, receiving GPS data from the MS to be located, wherein said GPS data comprises TOA or pseudorange measures;
at a first location measurement unit (LMU), receiving a communications-band signal from said MS to be located and using location-measurement facilities to extract location-related characteristic data from the communications-band signal, wherein, at the first location measurement unit (LMU), the extraction of location-related characteristic data from said communications-band signal comprises measuring location-related signal characteristics of the communications-band signal, said location-related characteristic data extracted from the communications-band signal including at least one of time of arrival (TOA) data, time difference of arrival (TDOA) data, angle of arrival (AOA) data, signal strength or propagation loss (PL) data, and timing advance (TA) data; and
wherein said location-related characteristic data extracted from the communications-band signal is a function of the geographic location of said MS relative to said first location measurement unit (LMU);
at a land station equipped for performing location-determination calculations, selecting location-determining data for the location-determination calculations based on location latency requirements, call state of the MS, and network state of the MS, wherein the location-determining data is selected from the group consisting of the GPS data, the extracted location-related characteristic data, or a combination of the GPS data and the extracted location-related characteristic data; and
at the land station equipped for performing location-determination calculations, performing location-determination calculations using the location-determining data to derive an estimated location for the MS.
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Accused Products
Abstract
A method and system for enhancing the accuracy and robustness of locations determined for a mobile wireless transceiver in a cellular telephone communications system integrating location-related information both from an assisted GPS device embedded in the mobile unit and from infrastructure-based facilities that extract signal characteristic data at networked base stations. Available supporting collateral information may be additionally evaluated in the location determinations to provide location estimates of enhanced robustness and accuracy.
86 Citations
41 Claims
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1. A method for determining the location of a mobile station (MS) equipped with embedded GPS signal reception capability and equipped to operate within a wireless communications network (WCN), the method comprising:
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using a serving cell site of the WCN, providing assistance data to the MS to be located, said assistance data enhancing an ability of the MS to receive GPS signals and extract time of arrival (TOA) or pseudorange measures; at the serving cell site, receiving GPS data from the MS to be located, wherein said GPS data comprises TOA or pseudorange measures; at a first location measurement unit (LMU), receiving a communications-band signal from said MS to be located and using location-measurement facilities to extract location-related characteristic data from the communications-band signal, wherein, at the first location measurement unit (LMU), the extraction of location-related characteristic data from said communications-band signal comprises measuring location-related signal characteristics of the communications-band signal, said location-related characteristic data extracted from the communications-band signal including at least one of time of arrival (TOA) data, time difference of arrival (TDOA) data, angle of arrival (AOA) data, signal strength or propagation loss (PL) data, and timing advance (TA) data; and
wherein said location-related characteristic data extracted from the communications-band signal is a function of the geographic location of said MS relative to said first location measurement unit (LMU);at a land station equipped for performing location-determination calculations, selecting location-determining data for the location-determination calculations based on location latency requirements, call state of the MS, and network state of the MS, wherein the location-determining data is selected from the group consisting of the GPS data, the extracted location-related characteristic data, or a combination of the GPS data and the extracted location-related characteristic data; and at the land station equipped for performing location-determination calculations, performing location-determination calculations using the location-determining data to derive an estimated location for the MS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for determining the location of a mobile station (MS) equipped with embedded GPS signal reception capability and equipped to operate within a wireless communications network, comprising:
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means for receiving GPS data for use in location-determination calculations, said GPS data being received from the MS to be located; a first location measurement unit (LMU) equipped with location-measurement facilities and a receiver for receiving from said MS to be located a wireless communications-band signal and using the location-measurement facilities to extract location-related characteristic data from the communications-band signal, wherein said location-measurement facilities include means for measuring location-related signal characteristics of the communications-band signal and for deriving at least one of time of arrival (TOA) data, time difference of arrival (TDOA) data, angle of arrival (AOA) data, signal strength or propagation loss (PL) data, and timing advance (TA) data, and wherein said location-related characteristic data extracted from the communications-band signal is a function of the geographic location of said MS relative to said first LMU; and a land station equipped for performing the location-determination calculations, including a processor for; selecting location-determining data for the location-determination calculations based on location latency requirements, call state of the MS, and network state of the MS, wherein the location-determining data set is selected from the group consisting of the GPS data, the extracted location-related characteristic data, or a combination of the GPS data and the extracted location-related characteristic data, and performing the location-determination calculations using the location-determining data to derive an estimated location for the MS. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for determining the location of a mobile station (MS) equipped with embedded GPS signal reception capability and equipped to operate within a wireless communications network, the method comprising:
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(a) providing assistance data to the MS to be located, said assistance data enabling the MS to receive GPS signals and extract TOA or pseudorange measures; (b) at a first location measurement unit (LMU), receiving a communications-band signal from said MS to be located and using location-measurement facilities to extract location-related characteristic data from the communications-band signal, wherein, at the first location measurement unit (LMU), the extraction of location-related characteristic data from said communications-band signal comprises measuring location-related signal characteristics of the communications-band signal, said location-related characteristic data extracted from the communications-band signal including at least one of time of arrival (TOA) data, time difference of arrival (TDOA) data, angle of arrival (AOA) data, signal strength or propagation loss (PL) data, and timing advance (TA) data; (c) communicating the TOA or pseudorange measures and the extracted location-related characteristic data to a land station equipped for performing location-determination calculations; (d) at said land station equipped for performing location-determination calculations, selecting location-determining data for the location-determination calculations based on location latency requirements, call state of the MS, and network state of the MS, wherein the location-determining data is selected from the group consisting of the GPS data, the extracted location-related characteristic data, or a combination of the GPS data and the extracted location-related characteristic data; and (e) at said land station equipped for performing location-determination calculations, performing the location-determination calculations using the location-determining data to derive an estimated location for the MS. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system for determining the location of a mobile station (MS) equipped with embedded GPS signal reception capability and equipped to operate within a wireless communications network, the system comprising:
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means for providing assistance data to the MS to be located, said assistance data enabling the MS to receive GPS signals and extract TOA or pseudorange measures; a first location measurement unit (LMU) configured to receive a communications-band signal from said MS to be located and to use location-measurement facilities to extract location-related characteristic data from the communications-band signal, wherein the location-measurement facilities include facilities to derive location-related characteristic data from said communications-band signal including at least one of time of arrival (TOA) data, time difference of arrival (TDOA) data, angle of arrival (AOA) data, signal strength or propagation loss (PL) data, and timing advance (TA) data; and a land station equipped for performing location-determination calculations and configured to; select location-determining data for the location-determination calculations based on location latency requirements, call state of the MS, and network state of the MS, wherein the location-determining data is selected from the group consisting of the GPS data, the extracted location-related characteristic data, or a combination of the GPS data and the extracted location-related characteristic data, and perform the location-determination calculations using the location-determining data to derive an estimated location for the MS. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification