Patent US5943014A successfully refreshed from Google Patents.
US5943014A
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Using a signal with increased power for determining the position of a mobile subscriber in a CDMA cellular telephone system
Assignee: Qualcomm Inc
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Filing: 1996-06-06
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Granted: 1999-08-24
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Expires: 2016-06-06
Abstract
Abstract A method for determining the position of a mobile station within a cellular telephone system having a plurality of base stations. A signal is transmitted at a low power level from the mobile station. The strength of the signal is then temporarily increased from the low power level to an increased power level, and the signal is temporarily transmitted from the mobile station at this increased power level. While the signal is being temporarily transmitted from the mobile station at the increased power level, the signal is used to make at least a first positional measurement. The position of the mobile station is determined in accordance with the first positional measurement.
Inventors
- 👤 Klein S. Gilhousen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:38
CPC Classifications
H; H04; H04W; H04W64/00; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
173 words
A method for determining the position of a mobile station within a cellular telephone system having a plurality of base stations, comprising the steps of: (A) transmitting a signal at a first power level on a first channel from said mobile station within said cellular telephone system; (B) temporarily switching said signal from said first channel to a second channel different from said first channel and while said signal is being transmitted on said second channel temporarily increasing a strength of said signal from said first power level to an increased power level and transmitting said signal from said mobile station on said second channel at said increased power level; (C) while said signal is being temporarily transmitted on said second channel from said mobile station at said increased power level, using said signal being transmitted at said increased power level from said mobile station to make at least a first positional measurement; and (D) determining said position of said mobile station in accordance with said first positional measurement and other positional measurements.
Claim 2
Independent Claim
173 words
A method for determining the position of a mobile station within a cellular telephone system having a plurality of base stations, comprising the steps of: (A) transmitting a signal at a first power level on a first channel from said mobile station within said cellular telephone system; (B) temporarily switching said signal from said first channel to a second channel different from said first channel and while said signal is being transmitted on said second channel temporarily increasing a strength of said signal from said first power level to an increased power level and transmitting said signal from said mobile station on said second channel at said increased power level; (C) while said signal is being temporarily transmitted on said second channel from said mobile station at said increased power level, using said signal being transmitted at said increased power level from said mobile station to make at least a first positional measurement; and (D) determining said position of said mobile station in accordance with said first positional measurement and other positional measurements.
Claim 3
Dependent Claim
44 words
The method of claim 1, further comprising the step of: (E) after step (C), decreasing said strength of said signal to said first power level and resuming transmission of said signal at said first power level from said mobile station on said first channel.
Claim 4
Dependent Claim
21 words
The method of claim 2, further comprising the step of: (F) repeating steps (B) through (E) periodically at a regular interval.
Claim 5
Dependent Claim
58 words
The method of claim 3, wherein said strength of said signal is increased in step (B) for a predetermined period of time and, after expiration of said predetermined period of time, said strength of said signal is decreased to said first power in step (E), and wherein said signal corresponds to a series of frames of voice information.
Claim 6
Dependent Claim
20 words
The method of claim 4, wherein said predetermined period of time corresponds to at least one of said voice frames.
Claim 7
Dependent Claim
18 words
The method of claim 4, wherein said predetermined period of time corresponds to one of said voice frames.
Claim 8
Dependent Claim
20 words
The method of claim 4, wherein said regular interval corresponds one out of every 100 ones of said voice frames.
Claim 9
Dependent Claim
43 words
The method of claim 2, further comprising the step of: (F) repeating steps (B) through (E) periodically at a regular interval only when said position of said mobile station cannot be determined from timing measurements made using said signal at said first power.
Claim 10
Dependent Claim
68 words
The method of claim 1, wherein step (C) further comprises the steps of: (i) receiving said signal transmitted at said increased power level at a first reception station; (ii) receiving said signal transmitted at said increased power level at a second reception station; and (iii) determining said first positional measurement in accordance with said signal at said increased power level received at said first and second reception stations.
Claim 11
Dependent Claim
55 words
The method of claim 9, wherein said first positional measurement represents an arrival time difference between a first relative time when said signal at said increased power level is received at said first reception station and a second relative time when said signal at said increased power level is received at said second reception station.
Claim 12
Dependent Claim
52 words
The method of claim 10, further comprising the step of measuring a round trip signal propagation time between said first reception station and said mobile station, wherein said position of said mobile station is determined in step (D) in accordance with said first positional measurement and said round trip signal propagation time.
Claim 13
Dependent Claim
35 words
The method of claim 11, further comprising the step of using a map matching table to estimate said position of said mobile station from said first positional measurement and said round trip signal propagation time.
Claim 14
Dependent Claim
50 words
The method of claim 10, wherein step (C) further comprises the steps of: (iv) receiving said signal transmitted at said increased power level at a third reception station and determining a second positional measurement in accordance with said signal at said increased power level received at said third reception station.
Claim 15
Dependent Claim
61 words
The method of claim 13, wherein said second positional measurement represents an arrival time difference between said first relative time and a third relative time when said signal at said increased power level is received at said third reception station, wherein said position of said mobile station is determined in step (D) in accordance with said first and second positional measurements.
Claim 16
Dependent Claim
30 words
The method of claim 14, further comprising the step of using a map matching table to estimate said position of said mobile station from said first and second positional measurements.
Claim 17
Dependent Claim
15 words
The method of claim 9, wherein said first reception station is a first base station.
Claim 18
Dependent Claim
15 words
The method of claim 16, wherein said second reception station is a second base station.
Claim 19
Dependent Claim
18 words
The method of claim 1, wherein step (D) is performed within a switching center of said cellular system.
Claim 20
Dependent Claim
14 words
The method of claim 1, wherein step (D) is performed with a base station.
Claim 21
Dependent Claim
19 words
The method of claim 1, wherein said cellular telephone system is a code division multiple access cellular telephone system.
Claim 22
Dependent Claim
19 words
The method of claim 1, wherein said cellular telephone system is a time division multiple access cellular telephone system.
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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) | 2002-08-23 | 2003-02-22 | 2003-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-23 | 2007-02-22 | 2007-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-23 | 2011-02-22 | 2011-08-24 | $7700.00 | Window Closed / Lapsed |