US6154657A
Expired / Lapsed
US
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Smart subdivision of base station candidates for position location accuracy
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1997-10-21
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Granted: 2000-11-28
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Expires: 2017-10-21
Abstract
Abstract In a cellular telephone system of the type having the capability of making measurements useful in determining the location of a mobile station, at least one such measurement is made. The measurement is made in accordance with a cost function which minimizes the costs to the systems. A position fix of the mobile station is determined using the cost function and the measurement.
Inventors
- 👤 Hans George Grubeck
- 👤 Bengt Bengkvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:00
CPC Classifications
H; H04; H04W; H04W64/00; G; G01; G01S; G01S5/00; G01S5/02; G01S5/04; G01S5/06; G01S5/14
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
135 words
A method for determining the position of a mobile station whose approximate location is known in a cellular telephone system having a plurality of base stations with known locations, which comprises: defining a function, which describes the cost of performing positioning measurements within the system involving system resources including a certain subset of base stations and a certain channel for positioning measurements; selecting a subset of base stations and a channel, which minimizes the cost of the resources within the system when performing the positioning measurements; assigning the mobile station to said channel; performing the positioning measurements relating to the position of the mobile station from said selected set of base stations having known locations on said channel; and obtaining a position fix estimate within a required degree of accuracy based upon said positioning measurements.
Claim 2
Independent Claim
135 words
A method for determining the position of a mobile station whose approximate location is known in a cellular telephone system having a plurality of base stations with known locations, which comprises: defining a function, which describes the cost of performing positioning measurements within the system involving system resources including a certain subset of base stations and a certain channel for positioning measurements; selecting a subset of base stations and a channel, which minimizes the cost of the resources within the system when performing the positioning measurements; assigning the mobile station to said channel; performing the positioning measurements relating to the position of the mobile station from said selected set of base stations having known locations on said channel; and obtaining a position fix estimate within a required degree of accuracy based upon said positioning measurements.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein said function is dependent on the time when measurements are performed.
Claim 4
Independent Claim
22 words
A method according to claims 1 or 2, wherein said function is dependent on the time period, within which measurements are performed.
Claim 5
Independent Claim
23 words
A method according to claims 1 or 2, wherein said function is dependent on predictions of the accuracy of said position fix estimate.
Claim 6
Independent Claim
22 words
A method according to claims 1 or 2, wherein said function is dependent on which channels are used for the said measurements.
Claim 7
Independent Claim
24 words
A method according to claims 1 or 2, wherein said function is dependent on predictions of the accuracy of said measurements on different channels.
Claim 8
Dependent Claim
18 words
A method according to claim 6, where said predictions of measurement accuracies are dependent on the signal quality.
Claim 9
Independent Claim
22 words
A method according to claims 1 or 2, wherein said function is dependent on the number of base stations in said subset.
Claim 10
Independent Claim
20 words
A method according to claims 1 or 2, wherein said function is dependent on prior knowledge of the mobile position.
Claim 11
Dependent Claim
21 words
A method according to claim 9, wherein said function is dependent on an estimate of the accuracy of said mobile position.
Claim 12
Independent Claim
33 words
A method according to claims 1 or 2, wherein said function is dependent on the load distribution in the network for a certain choice of said channel and said subset of base stations.
Claim 13
Independent Claim
27 words
A method according to claims 1 or 2, wherein said function is dependent on the measurement methods used for said channel and said subset of base stations.
Claim 14
Independent Claim
22 words
A method according to claims 1 or 2, wherein said function is dependent on the cost of using a high quality channel.
Claim 15
Independent Claim
20 words
A method according to claims 1 or 2, wherein said function is dependent on the locations of said base stations.
Claim 16
Independent Claim
20 words
A method according to claims 1 or 2, wherein said function is dependent on the estimated geometric dilution of precision.
Claim 17
Dependent Claim
20 words
A method according to claim 12, wherein one of the said measurement methods is the time of arrival measurement method.
Claim 18
Dependent Claim
21 words
A method according to claim 12, wherein one of the said measurement methods is the time difference of arrival measurement method.
Claim 19
Independent Claim
20 words
A method according to claims 12, wherein one of the said measurement methods is the angle of arrival measurement method.
Claim 20
Independent Claim
32 words
A method according to claims 1 or 2, wherein one base station at the time performs measurements in said subset of base stations, that is measurements are performed in a sequential order.
Claim 21
Dependent Claim
31 words
A method according to claim 19, wherein a new subset of base stations and a new channel according to said function can be selected for every step in said sequential order.
Claim 22
Dependent Claim
16 words
A method according to claim 20, wherein said mobile station is assigned to said new channel.
Claim 23
Dependent Claim
18 words
A method according to claim 20, wherein said function is dependent on previous measurements in said sequential order.
Claim 24
Dependent Claim
21 words
A method according to claim 20, wherein said function is dependent on the cost due to a change of channel assignment.
Claim 25
Dependent Claim
23 words
A method according to claim 20, wherein said function is dependent on the cost due to a change of subset of base station.
Claim 26
Dependent Claim
42 words
The method according to claim 1 wherein the step of assigning the mobile station to a channel includes assigning the mobile station to one of the base stations from the subset of base stations for the specific purpose of performing the measurement.
Claim 27
Dependent Claim
143 words
A positioning system for a cellular telephone system having a plurality of base stations with known locations and at least one mobile station whose approximate location is known, which comprises: means for defining a function, which describes the cost of performing positioning measurements within the system involving system resources including a certain subset of base stations and a certain channel for positioning measurements; means for selecting a subset of base stations and a channel, which minimizes the cost of the resources within the system when performing the positioning measurements; means for assigning the mobile station to said channel; means for performing positioning measurements relating to the position of the mobile station from said selected set of base stations having known locations on said channel; and means for obtaining a position fix estimate within a required degree of accuracy based upon said positioning measurements.
Claim 28
Dependent Claim
143 words
A positioning system for a cellular telephone system having a plurality of base stations with known locations and at least one mobile station whose approximate location is known, which comprises: means for defining a function, which describes the cost of performing positioning measurements within the system involving system resources including a certain subset of base stations and a certain channel for positioning measurements; means for selecting a subset of base stations and a channel, which minimizes the cost of the resources within the system when performing the positioning measurements; means for assigning the mobile station to said channel; means for performing positioning measurements relating to the position of the mobile station from said selected set of base stations having known locations on said channel; and means for obtaining a position fix estimate within a required degree of accuracy based upon said positioning measurements.
Claim 29
Dependent Claim
42 words
The system according to claim 26 wherein the means for assigning the mobile station to a channel includes assigning the mobile station to one of the base stations from the subset of base stations for the specific purpose of performing a measurement.
Claim 30
Dependent Claim
20 words
The system according to claim 27 wherein the means for obtaining a position fix estimate includes a Taylor series estimation.
Claim 31
Dependent Claim
41 words
The system according to claim 28 wherein the means for performing measurements is selected from means for performing a time of arrival measurement, means for performing a time difference of arrival measurement, or means for performing an angle of arrival measurement.
Claim 32
Dependent Claim
20 words
The system according to claim 25 wherein the means for obtaining a position fix estimate includes a Taylor series estimation.
Claim 33
Dependent Claim
35 words
The method according to claim 30 wherein the step of performing measurements is selected from performing a time of arrival measurement, performing a time difference of arrival measurement, or performing an angle of arrival measurement.
References Cited (Backward Citations)
US4229620A
Cited
US4731613A
Cited
US4728959A
Cited
US4740792A
Cited
US4916455A
Cited
US4888593A
Cited
US4891650A
Cited
US5023900A
Cited
US5095500A
Cited
US5058200A
Cited
US5293642A
Cited
US5208756A
Cited
US5526357A
Cited
US5642398A
Cited
US5642353A
Cited
US5365450A
Cited
US5317323A
Cited
US5465289A
Cited
US5608410A
Cited
US5537460A
Cited
US5914668A
Cited
US6011974A
Cited
US6009334A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-11-28 | 2004-05-29 | 2004-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-28 | 2008-05-29 | 2008-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-28 | 2012-05-29 | 2012-11-28 | $7700.00 | Window Closed / Lapsed |