US6370357B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile speed estimation for digital cellular radio systems
Assignee: Apple Inc
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Filing: 1998-12-21
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Granted: 2002-04-09
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Expires: 2018-12-21
Abstract
Abstract For a hierarchical mobile cellular communications system comprising a plurality of microcells and overlaid macrocells, a method is disclosed for estimating the speed of a mobile. The speed estimate assists in the assignment of slow-moving mobiles to microcells and fast-moving mobiles to macrocells, thus keeping the cellular system in optimum utilization. The method first calculates a power signal of the received signals. The power signal is then filtered and decimated. The speed of a mobile is estimated from a determination of the offset autocorrelation of the filtered and decimated power signal.
Inventors
- 👤 Chengshan Xiao
- 👤 Karl D. Mann
- 👤 Jan C. Olivier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:59
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/02; G01S11/10; G01S11/06; H; H04; H04W; H04W36/00; H04W36/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
136 words
A method for estimating a speed of a mobile communication apparatus in a digital mobile communication network comprising: receiving samples of a signal from said mobile communication apparatus, said samples arranged in time slots; deriving a power signal from said samples; and estimating an offset autocorrelation value of said power signal by correlating said power signal with a version of itself offset in time, said offset autocorrelation value representative of said speed of said mobile communication apparatus, said estimating said offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating said power signal with a version of said power signal displaced by a predetermined number of time slots; and summing each said single time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 2
Independent Claim
136 words
A method for estimating a speed of a mobile communication apparatus in a digital mobile communication network comprising: receiving samples of a signal from said mobile communication apparatus, said samples arranged in time slots; deriving a power signal from said samples; and estimating an offset autocorrelation value of said power signal by correlating said power signal with a version of itself offset in time, said offset autocorrelation value representative of said speed of said mobile communication apparatus, said estimating said offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating said power signal with a version of said power signal displaced by a predetermined number of time slots; and summing each said single time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 3
Dependent Claim
24 words
The method of claim 1 further comprising filtering said power signal to limit noise and interference, prior to said estimating said offset autocorrelation value.
Claim 4
Dependent Claim
24 words
The method of claim 2 further comprising decimating said filtered power signal to reduce computational complexity, prior to said estimating said offset autocorrelation value.
Claim 5
Dependent Claim
49 words
The method of claim 1 wherein estimating each said single time slot offset autocorrelation value comprises, repetitively, multiplying a sample of said power signal from a given time slot with a corresponding sample of said power signal displaced by said predetermined number of time slots; and summing resultant products.
Claim 6
Dependent Claim
40 words
The method of claim 4 further comprising: comparing said offset autocorrelation value to a first threshold after normalization; and if said offset autocorrelation value is less than said first threshold, indicating said speed of said mobile communication apparatus as “fast.”
Claim 7
Dependent Claim
28 words
The method of claim 5 further comprising, if said offset autocorrelation value is greater than said first threshold, indicating said speed of said mobile communication apparatus as “slow.”
Claim 8
Dependent Claim
38 words
The method of claim 5 further comprising: comparing said offset autocorrelation value to a second threshold; and if said offset autocorrelation value is greater than said second threshold, indicating said speed of said mobile communication apparatus as “slow.”
Claim 9
Dependent Claim
34 words
The method of claim 7 further comprising, if said offset autocorrelation value is greater than said first threshold and less than said second threshold, indicating said speed of said mobile communication apparatus as “indeterminate.”
Claim 10
Dependent Claim
19 words
The method of claim 4 wherein said estimating comprises determining a time-limited offset correlation value of said power signal.
Claim 11
Dependent Claim
119 words
A computer software medium, for providing program control for a manager of a system, comprising: means for receiving samples of a signal from a mobile communication apparatus; means for deriving a power signal from said samples; and means for estimating an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 12
Dependent Claim
119 words
A computer software medium, for providing program control for a manager of a system, comprising: means for receiving samples of a signal from a mobile communication apparatus; means for deriving a power signal from said samples; and means for estimating an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 13
Dependent Claim
110 words
A speed estimation apparatus comprising: a receiver for receiving samples of a signal from a mobile communication apparatus; means for deriving a power signal from said samples; and means for estimating an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 14
Dependent Claim
110 words
A speed estimation apparatus comprising: a receiver for receiving samples of a signal from a mobile communication apparatus; means for deriving a power signal from said samples; and means for estimating an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 15
Dependent Claim
153 words
A base station for mobile communications comprising: at least one antenna for receiving a signal from a mobile communication apparatus; at least one analog to digital converter for creating samples of said signal from said mobile communication apparatus; a system controller; a phone service interface; and at least one speed estimation apparatus operable to: receive said samples of said signal from said mobile communication apparatus; derive a power signal from said samples; and estimate an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 16
Dependent Claim
153 words
A base station for mobile communications comprising: at least one antenna for receiving a signal from a mobile communication apparatus; at least one analog to digital converter for creating samples of said signal from said mobile communication apparatus; a system controller; a phone service interface; and at least one speed estimation apparatus operable to: receive said samples of said signal from said mobile communication apparatus; derive a power signal from said samples; and estimate an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value.
Claim 17
Independent Claim
121 words
A system for mobile communication comprising: a mobile communication apparatus; and a base station including a speed estimation apparatus operable to: receive samples of a signal from said mobile communication apparatus; derive a power signal from said samples; and estimate an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value are amendment.
Claim 18
Independent Claim
121 words
A system for mobile communication comprising: a mobile communication apparatus; and a base station including a speed estimation apparatus operable to: receive samples of a signal from said mobile communication apparatus; derive a power signal from said samples; and estimate an offset autocorrelation value of said power signal, said offset autocorrelation value representative of said speed of said mobile communication apparatus said estimating offset autocorrelation value including: for each of a plurality of time slots, estimating a single time slot offset autocorrelation value by correlating the power signal with a version of the power signal displaced by a predetermined number of time slots, and summing each said signal time slot offset autocorrelation value to estimate said offset autocorrelation value are amendment.
Claim 19
Dependent Claim
27 words
The computer software medium of claim 10 further comprising means for filtering said power signal to limit noise and interference, prior to estimating said offset autocorrelation value.
Claim 20
Dependent Claim
28 words
The computer software medium of claim 14 further comprising means for decimating said filtered power signal to reduce computational complexity, prior to said estimating said offset autocorrelation value.
Claim 21
Dependent Claim
27 words
The speed estimation apparatus of claim 11 further comprising means for filtering said power signal to limit noise and interference, prior to estimating said offset autocorrelation value.
Claim 22
Dependent Claim
27 words
The speed estimation apparatus of claim 16 further comprising means decimating said filtered power signal to reduce computational complexity, prior to said estimating said offset autocorrelation value.
Claim 23
Dependent Claim
34 words
The base station of claim 12 wherein said at least one speed estimation apparatus is further operable to filter said power signal to limit noise and interference, prior to estimating said offset autocorrelation value.
Claim 24
Dependent Claim
35 words
The base station of claim 18 wherein said at least one speed estimation apparatus is further operable to decimate said filtered power signal to reduce computational complexity, prior to said estimating said offset autocorrelation value.
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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) | 2005-04-08 | 2005-10-08 | 2006-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-08 | 2009-10-08 | 2010-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-08 | 2013-10-08 | 2014-04-09 | $7700.00 | Window Closed / Lapsed |