System and method of UMTS UE location using uplink dedicated physical control channel and downlink synchronization channel
First Claim
1. A method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), the method comprising the steps of;
(a) collecting a plurality of signal samples from a wireless device by one or more LMUs in a first search window;
(b) determining a first time of arrival (“
TOA”
) from the plural signal samples;
(c) determining a second search window as a function of the first TOA;
(d) determining a second TOA from the plural signal samples in the second search window;
(e) determining a range estimate of the wireless device; and
(f) determining an estimated location of the wireless device as a function of the first TOA, the second TOA, or the range estimate and second TOA.
11 Assignments
0 Petitions
Accused Products
Abstract
A system and method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“LMUs”). A set of signal samples from a first wireless device and a second wireless device may be collected by one or more LMUs in a search window. A first time of arrival (“TOA”) is determined, and a second search window is estimated as a function of the first TOA. A second TOA may be determined within the second search window at a second node or one of the LMUs from the set of signal samples. A range estimate of the wireless device may then be determined, and an estimated location of the wireless device may be determined as a function of the first uplink TOA, the second uplink TOA, or the range estimate and second TOA.
70 Citations
42 Claims
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1. A method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), the method comprising the steps of;(a) collecting a plurality of signal samples from a wireless device by one or more LMUs in a first search window; (b) determining a first time of arrival (“
TOA”
) from the plural signal samples;(c) determining a second search window as a function of the first TOA; (d) determining a second TOA from the plural signal samples in the second search window; (e) determining a range estimate of the wireless device; and (f) determining an estimated location of the wireless device as a function of the first TOA, the second TOA, or the range estimate and second TOA. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- LMU”
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18. A method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), the method comprising the steps of;(a) collecting a set of signal samples from a wireless device by one or more LMUs wherein the set of signal samples are collected in a search window determined as a function of a first uplink time of arrival (“
TOA”
) from a first node;(b) determining from the set of signal samples a second uplink TOA at a second node or at the one or more LMUs; (c) determining a range estimate of the wireless device; and (d) determining an estimated location of the wireless device as a function of the first uplink TOA, the second uplink TOA, or the range estimate and the second TOA. - View Dependent Claims (19, 20, 21, 22, 23)
- LMU”
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24. A method for estimating a location of a wireless device in a communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), comprising the steps of;(a) collecting signal samples from the wireless device by one or more LMUs; (b) detecting a time of arrival (“
TOA”
) from the signal samples, the detecting including;(i) segmenting the collected signal samples to a predetermined length, (ii) determining an ambiguity function or correlation for each segment, and (iii) adding the ambiguity functions or correlations to detect a TOA; and (c) determining an estimated location of the wireless device as a function of the TOA, wherein a demeaned peak to standard deviation ratio is applied to the added ambiguity functions or correlations. - View Dependent Claims (25, 26)
- LMU”
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27. A method for estimating a location of a wireless device in a communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), comprising the steps of;(a) collecting signal samples from the wireless device by one or more LMUs; (b) detecting a time of arrival (“
TOA”
) from the signal samples, the detecting including;(i) determining a mixing product of the collected signal samples, (ii) decimating the mixing product, (iii) segmenting the decimated product to predetermined lengths, (iv) determining ambiguity functions for each segment, and (v) adding the ambiguity functions to detect a TOA; and (c) determining an estimated location of the wireless device as a function of the TOA, wherein a demeaned peak to standard deviation ratio is applied to the added ambiguity functions. - View Dependent Claims (28, 29)
- LMU”
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30. A method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), the method comprising the steps of;(a) collecting a set of signal samples from a wireless device by one or more LMUs in a search window determined as a function of a first uplink time of arrival (“
TOA”
) from a first node;(b) detecting a second uplink TOA at a second node or LMU from the set of signal samples by a plurality of non-coherent additions of ambiguity functions; (c) determining a range estimate of the wireless device; and (d) determining an estimated location of the wireless device as a function of the first uplink TOA, the second uplink TOA, or the range estimate and the second TOA. - View Dependent Claims (31, 32, 33, 34, 35, 36)
- LMU”
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37. A method for estimating a location of a wireless device in a wireless communication system having a plurality of nodes and a plurality of location measurement units (“
- LMU”
), the method comprising the steps of;(a) receiving a location request including tipping information at a processing device; (b) collecting uplink and downlink signal samples from the wireless device at one or more of the plural LMUs; (c) processing the uplink signal samples at the one or more LMUs to determine a time of arrival (“
TOA”
) at each of the one or more LMUs;(d) receiving at the processing device the TOA determined at each of the one or more LMUs; (e) determining at the processing device a search window for each of the one or more LMUs; (f) processing the uplink signal samples at each of the one or more LMUs using the respective search window determined at the processing device to determine a refined TOA; (g) determining at each of the one or more LMUs a range estimation for the wireless device; (h) receiving at the processing device the refined TOA and the range estimation determined at each of the one or more LMUs; and (i) estimating at the processing device the location of the wireless device using the refined TOA and the range estimation. - View Dependent Claims (38, 39, 40, 41, 42)
- LMU”
Specification