US6300905B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Location finding using a single base station in CDMA/TDMA systems
Assignee: Nokia of America Corp
•
Filing: 1999-10-05
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Granted: 2001-10-09
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Expires: 2019-10-05
Abstract
Abstract A location or position of a wireless mobile unit is determined using only measurements from a single base station. A distance between the wireless mobile unit and the base station is calculated utilizing a roundtrip delay value of an RF uplink signal received from a wireless mobile unit. Thereafter, an angle of arrival of the received signal is determined using measurements of the received signal from each of a plurality of antenna sectors of a multi-sector antenna. The angle of arrival is determined based upon stored antenna signal measurements of the multi-sector antenna, wherein a combination of different sector signal measurements corresponds to a single angle measurement. Using the determined distance and angle of arrival, a position or location of a wireless mobile unit can easily be determined using only measurements of the single base station.
Inventors
- 👤 Byron Hua Chen
- 👤 Tung Ching Chiang
- 👤 Ibrahim Tekin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:04
CPC Classifications
H; H04; H04W; H04W64/00; G; G01; G01S; G01S13/00; G01S13/74; G01S13/82; G01S13/84; G01S3/00; G01S3/02; G01S3/14; G01S3/28; G01S3/32; G01S5/00; G01S5/02; G01S5/0205; G01S5/0221; G01S5/02213; G01S5/02216; G01S5/06; G01S5/12
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
116 words
A method of determining a location of a wireless mobile unit, comprising the steps of: determining a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit; determining an angle of arrival of the signal from stored angle measurements using at least two different antenna sector signal measurements of the signal as received at the base station, wherein angle measurements are stored in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and determining the location of the wireless mobile unit from the received signal based upon the determined distance and the angle of the received signal.
Claim 2
Independent Claim
116 words
A method of determining a location of a wireless mobile unit, comprising the steps of: determining a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit; determining an angle of arrival of the signal from stored angle measurements using at least two different antenna sector signal measurements of the signal as received at the base station, wherein angle measurements are stored in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and determining the location of the wireless mobile unit from the received signal based upon the determined distance and the angle of the received signal.
Claim 3
Dependent Claim
20 words
The method of claim 1 , wherein the distance is determined from a roundtrip delay (RTD) of the received signal.
Claim 4
Dependent Claim
19 words
The method of claim 1 , wherein the distance is determined from a one-way delay of the received signal.
Claim 5
Dependent Claim
28 words
The method of claim 3 , wherein the one-way delay is determined based upon the wireless mobile unit and base station having clocks referenced to a third source.
Claim 6
Dependent Claim
15 words
The method of claim 4 , wherein the third source is a global positioning satellite.
Claim 7
Dependent Claim
20 words
The method of claim 1 , wherein the measurements of the received signal are obtained from three different antenna sectors.
Claim 8
Dependent Claim
33 words
The method of claim 1 , wherein the stored angle measurements include angles from zero to 360 degrees, each angle measurement being stored in correspondence with at least two different antenna sector measurements.
Claim 9
Dependent Claim
20 words
The method of claim 1 , wherein the measurements of the received signal are obtained from three different antenna sectors.
Claim 10
Dependent Claim
22 words
The method of claim 1 , wherein the angle of arrival is determined from a difference between two antenna sector signal measurements.
Claim 11
Dependent Claim
22 words
The method of claim 4 , wherein the angle of arrival is determined from a difference between two antenna sector signal measurements.
Claim 12
Dependent Claim
23 words
The method of claim 1 , wherein, for each combination of two different antenna sector measurements, a single different angle measurement is stored.
Claim 13
Dependent Claim
20 words
The method of claim 11 , wherein the measurements of the received signal are obtained from three different antenna sectors.
Claim 14
Dependent Claim
49 words
The method of claim 1 , wherein the angle measurements and corresponding signal measurements are stored in a lookup table (LUT), and wherein the angle of arrival is determined as an angle measurement of the LUT corresponding to at least two different antenna sector measurements of the received signal.
Claim 15
Dependent Claim
23 words
The method of claim 13 , wherein the signal measurements stored in the LUT are difference measurements between pairs of the multi-sector antenna.
Claim 16
Dependent Claim
76 words
The method of claim 14 , wherein difference measurements of a first sector pair correspond to angles from approximately zero degrees to approximately one hundred and twenty degrees, difference measurements of a second sector pair correspond to angles from approximately one hundred twenty degrees to approximately two hundred and forty degrees and difference measurements of a third sector pair correspond to angles from approximately two hundred and forty degrees to approximately three hundred and sixty degrees.
Claim 17
Dependent Claim
26 words
The method of claim 1 , wherein a signal received by a single base station is used to determine the location of the wireless mobile unit.
Claim 18
Dependent Claim
24 words
The method of claim 1 , wherein signals received by two base stations are used to determine the location of the wireless mobile unit.
Claim 19
Independent Claim
133 words
An apparatus for determining a location of a wireless mobile unit using signal measurements from a single base station comprising: a signal determining device adapted to determine a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit; a memory, adapted to store angle measurements in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and a location calculator, adapted to determine an angle of arrival of the signal from the stored angle measurements using at least two different antenna sector signal measurements of the signal and adapted to determine the location of the wireless mobile unit from the received signal based upon the determined distance and angle of arrival of the received signal.
Claim 20
Independent Claim
133 words
An apparatus for determining a location of a wireless mobile unit using signal measurements from a single base station comprising: a signal determining device adapted to determine a distance between the wireless mobile unit and a multi-sector antenna belonging to a base station receiving a signal from the wireless mobile unit; a memory, adapted to store angle measurements in correspondence with antenna sector measurements of at least two different sectors of the multi-sector antenna; and a location calculator, adapted to determine an angle of arrival of the signal from the stored angle measurements using at least two different antenna sector signal measurements of the signal and adapted to determine the location of the wireless mobile unit from the received signal based upon the determined distance and angle of arrival of the received signal.
Claim 21
Dependent Claim
23 words
The apparatus of claim 18 , wherein the signal determining device determines the distance from a roundtrip delay (RTD) of the received signal.
Claim 22
Dependent Claim
19 words
The apparatus of claim 18 , wherein the distance is determined from a one-way delay of the received signal.
Claim 23
Dependent Claim
28 words
The apparatus of claim 20 , wherein the one-way delay is determined based upon the wireless mobile unit and base station having clocks referenced to a third source.
Claim 24
Dependent Claim
15 words
The method of claim 21 , wherein the third source is a global positioning satellite.
Claim 25
Dependent Claim
21 words
The apparatus of claim 18 , wherein the location calculator receives measurements of the received signal from three different antenna sectors.
Claim 26
Dependent Claim
21 words
The apparatus of claim 18 , wherein the location calculator receives measurements of the received signal from three different antenna sectors.
Claim 27
Dependent Claim
22 words
The apparatus of claim 18 , wherein the angle of arrival is determined from a difference between two antenna sector signal measurements.
Claim 28
Dependent Claim
24 words
The apparatus of claim 18 , wherein each combination of two different antenna sector measurements is stored in correspondence with a different angle measurement.
Claim 29
Dependent Claim
21 words
The apparatus of claim 26 , wherein the location calculator receives measurements of the received signal from three different antenna sectors.
Claim 30
Dependent Claim
19 words
The apparatus of claim 18 , wherein the memory stores angle measurements spanning angles from zero to 360 degrees.
Claim 31
Dependent Claim
14 words
The apparatus of claim 18 , wherein the memory includes a lookup table (LUT).
Claim 32
Dependent Claim
24 words
The apparatus of claim 29 , wherein the antenna sector measurements stored in the LUT are difference measurements between pairs of the multi-sector antenna.
Claim 33
Dependent Claim
76 words
The apparatus of claim 30 , wherein difference measurements of a first sector pair correspond to angles from approximately zero degrees to approximately one hundred and twenty degrees, difference measurements of a second sector pair correspond to angles from approximately one hundred twenty degrees to approximately two hundred and forty degrees and difference measurements of a third sector pair correspond to angles from approximately two hundred and forty degrees to approximately three hundred and sixty degrees.
Claim 34
Dependent Claim
26 words
The apparatus of claim 18 , wherein a signal received by a single base station is used to determine the location of the wireless mobile unit.
Claim 35
Dependent Claim
24 words
The apparatus of claim 18 , wherein signals received by two base stations are used to determine the location of the wireless mobile unit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-10-08 | 2005-04-09 | 2005-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-08 | 2009-04-09 | 2009-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-08 | 2013-04-09 | 2013-10-09 | $7700.00 | Window Closed / Lapsed |