Patent US6055428A successfully refreshed from Google Patents.
US6055428A
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Method and apparatus for performing soft hand-off in a wireless communication system
Assignee: Qualcomm Inc
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Filing: 1997-07-21
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Granted: 2000-04-25
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Expires: 2017-07-21
Abstract
Abstract At the mobile station the measured pilot energy of each pilot in the candidate set is iteratively compared against a threshold generated in accordance with the sum of the energies of the pilots in the active set. If the strongest pilot in the candidate set satisfies this threshold condition, it is added to the revised active set. A second iterative process is performed to determine whether a pilot should be deleted from the revised active set. The mobile station determines whether a change to the current active set is desirable by measuring the energies of the pilots in the active set and the candidate set, and dynamically adjusting the necessary thresholds based on its own estimation of the communication environment.
Inventors
- 👤 Samir S. Soliman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:15
CPC Classifications
H; H04; H04W; H04W48/00; H04W48/20; H04W36/00; H04W36/16; H04W36/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
95 words
A method for selecting base stations to communicate with a remote station, comprising the steps of: measuring at said remote station signal energies for signals received from base stations capable of communicating with said remote station; computing at least one dynamic threshold value using more than one of said signal energies; comparing a signal energy of a first base station with said at least one dynamic threshold; and selecting said first base station when said signal energy of said first base station exceeds at least a designated one of said at least one dynamic thresholds.
Claim 2
Independent Claim
95 words
A method for selecting base stations to communicate with a remote station, comprising the steps of: measuring at said remote station signal energies for signals received from base stations capable of communicating with said remote station; computing at least one dynamic threshold value using more than one of said signal energies; comparing a signal energy of a first base station with said at least one dynamic threshold; and selecting said first base station when said signal energy of said first base station exceeds at least a designated one of said at least one dynamic thresholds.
Claim 3
Dependent Claim
34 words
The method in accordance with claim 1, wherein said at least one dynamic threshold value corresponds to an average value of said signal energies associated with communication channels currently assigned to said remote station.
Claim 4
Dependent Claim
42 words
The method in accordance with claim 1, wherein said designated one of said at least one dynamic threshold is calculated by performing a linear operation upon said signal energies for signals received from base stations capable of communicating with said remote station.
Claim 5
Dependent Claim
25 words
The method in accordance with claim 3, wherein said linear operation is performed on the linear relationship Y1, wherein Y1=SOFT -- SLOPE*COMBINED -- PILOT+ADD INTERCEPT.
Claim 6
Dependent Claim
26 words
The method in accordance with claim 1, wherein said signal energies associated with communication channels currently assigned to said remote station comprise pilot signal energy values.
Claim 7
Dependent Claim
31 words
The method in accordance with claim 3, wherein said linear operation is calculated in said remote station in response to a variation, over a predetermined time period, in said signal energies.
Claim 8
Dependent Claim
23 words
The method in accordance with claim 3 wherein said linear operation is calculated in said remote station in response to stored system parameters.
Claim 9
Dependent Claim
44 words
The method in accordance with claim 3, wherein said linear operation comprises the steps of: multiplying said signal energies from base stations capable of communicating with said remote station by a first variable; and summing a second variable with the product of said multiplication.
Claim 10
Dependent Claim
48 words
The method in accordance with claim 1, further comprising removing a base station from an active set if said signal energies associated with said communication channels currently assigned between said base station and said mobile station falls below said designated one of said at least one dynamic threshold.
Claim 11
Dependent Claim
117 words
A signal processing apparatus used to direct communications between a mobile station and base stations, comprising: more than one base station; a mobile station; and at least one digital signal processor capable of processing digital signal instructions to: measure at said remote station signal energies for signals received from base stations capable of communicating with said remote station; compute at least one dynamic threshold value using more than one of said signal energies; compare a signal energy of a first base station with said at least one dynamic threshold; and select said first base station when said signal energy of said first base station exceeds at least a designated one of said at least one dynamic thresholds.
Claim 12
Dependent Claim
117 words
A signal processing apparatus used to direct communications between a mobile station and base stations, comprising: more than one base station; a mobile station; and at least one digital signal processor capable of processing digital signal instructions to: measure at said remote station signal energies for signals received from base stations capable of communicating with said remote station; compute at least one dynamic threshold value using more than one of said signal energies; compare a signal energy of a first base station with said at least one dynamic threshold; and select said first base station when said signal energy of said first base station exceeds at least a designated one of said at least one dynamic thresholds.
References Cited (Backward Citations)
US4123718A
Cited
US4112257A
Cited
US4868795A
Cited
US4777653A
Cited
US4765753A
Cited
US4811421A
Cited
US4901307A
Cited
US4870698A
Cited
US5056109A
Cited
US5257283A
Cited
US5101501A
Cited
US5267262A
Cited
US5265119A
Cited
US5128965A
Cited
US5103459A
Cited
US5103459B1
Cited
US5390338A
Cited
US5093840A
Cited
US5204876A
Cited
US5107487A
Cited
US5220678A
Cited
US5245629A
Cited
US5267261A
Cited
US5640414A
Cited
US5305468A
Cited
US5450616A
Cited
US5465399A
Cited
WO1994006218A1
Cited
US5483669A
Cited
US5487180A
Cited
US5574983A
Cited
WO1995012297A1
Cited
US5383219A
Cited
US5548808A
Cited
US5548812A
Cited
US5577022A
Cited
EP0756387A2
Cited
WO1997008911A1
Cited
US5854785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-25 | 2003-10-25 | 2004-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-25 | 2007-10-25 | 2008-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-25 | 2011-10-25 | 2012-04-25 | $7700.00 | Window Closed / Lapsed |