Patent US6157668A successfully refreshed from Google Patents.
US6157668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for reducing the average transmit power of a base station
Assignee: Qualcomm Inc
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Filing: 1994-09-30
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Granted: 2000-12-05
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Expires: 2014-09-30
Abstract
Abstract A plurality of methods for achieving the soft or softer handoff process such that the performance of a system is improved. A first method is based on delaying the softer handoff process. A second method is based on reducing the power of transmissions from the sector having the weakest signal strength. A third method is based on eliminating transmissions from the sector having the weakest signal strength. A fourth method adds a new base station or sector only when the mobile unit is in need of additional power to operate properly. In all four methods, reverse link demodulation in each sector may continue with or without the transmission of the forward link. In all four methods the operation could be based on the signal strength of the reverse link signal or the forward link. It is also possible to combine two or more of these methods to create a hybrid method.
Inventors
- 👤 Klein S. Gilhousen
- 👤 Roberto Padovani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:52
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/06; H04W36/16; H04W36/18; H04W52/00; H04W52/04; H04W52/18; H04W52/24; H04W52/38; H04W52/40; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/0491; H04W16/00; H04W16/24; H04W36/20; H04W52/30; H04W52/34
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
215 words
In a spread spectrum communication system in which a mobile user communicates with another user via at least one base station in a system of base stations as directed by a system controller, a method for directing communications between said mobile unit user and said system of base stations comprising the steps of: communicating by said mobile unit with a first base station wherein said first base station has an entry on a first list stored in said mobile unit wherein said first list comprises an entry for each of the one or more base stations in active communication with said mobile unit; measuring at said mobile unit signal strength transmitted by a second base station through which active communication is not established; providing by said mobile unit to said system controller a measured signal strength of said first base station and said measured signal strength of said second base station; and comparing at said system controller said measured signal strength of said first base station to a desired operating power and sending said mobile unit a new first list comprising said second base station if said measured signal strength of said first base station is less than said desired operating power and said mobile unit is not in communication with any other base station.
Claim 2
Dependent Claim
215 words
In a spread spectrum communication system in which a mobile user communicates with another user via at least one base station in a system of base stations as directed by a system controller, a method for directing communications between said mobile unit user and said system of base stations comprising the steps of: communicating by said mobile unit with a first base station wherein said first base station has an entry on a first list stored in said mobile unit wherein said first list comprises an entry for each of the one or more base stations in active communication with said mobile unit; measuring at said mobile unit signal strength transmitted by a second base station through which active communication is not established; providing by said mobile unit to said system controller a measured signal strength of said first base station and said measured signal strength of said second base station; and comparing at said system controller said measured signal strength of said first base station to a desired operating power and sending said mobile unit a new first list comprising said second base station if said measured signal strength of said first base station is less than said desired operating power and said mobile unit is not in communication with any other base station.
Claim 3
Dependent Claim
46 words
The method of claim 1 wherein each base station in said system of base stations transmits a pilot signal and wherein said measured signal strength of said second base station is a measurement of signal strength of said pilot signal transmitted by said second base station.
Claim 4
Dependent Claim
156 words
The method of claim 1 further comprising the steps of: communicating by said mobile unit simultaneously with said first and a third base station wherein said third base station has an entry on said first list; providing by said mobile to said system controller a measured signal strength of said third base station wherein said measured signal strength of said third base station is less than said measured spinal strength of said first base station; summing at said system controller said measured signal strength of said first base station and said measured signal strength of said third base station; and comparing said summed measured signal strength of said first and third base stations to said desired operating power and sending said mobile unit a new first list comprising an entry corresponding to said second base station if said summed measured signal strength of said first and third base stations is less than said desired operating power.
Claim 5
Dependent Claim
110 words
The method of claim 1 further comprising the steps of: communicating by said mobile unit with a third base station wherein said third base station has an entry on said first list; providing by said mobile unit to said system controller a measurement of signal strength of said third base station wherein said measured signal strength of said third base station is less than said measured signal strength of said first and second base stations; and sending said mobile unit a new first list comprising an entry corresponding to said second base station if said measured signal strength of said first base station is less than said desired operating power.
Claim 6
Dependent Claim
34 words
The method of claim 4 wherein said measured signal strength of said third base station is less than said measured signal strength of said first and second base stations by a predetermined threshold amount.
Claim 7
Dependent Claim
75 words
The method of claim 4 further comprising the steps of: summing at said system controller said measured signal strength of said first base station and said measured signal strength of said second base station; and sending said mobile unit a new first list comprising an entry corresponding to said third base station only if said sum of said measured signal strengths of said first and second base stations is less than said desired operating power.
Claim 8
Dependent Claim
26 words
The method of claim 1 wherein said first base station and said second base stations are two different sectors of a common base station cell site.
Claim 9
Dependent Claim
36 words
The method of claim 1 wherein said first base station is a multisectored base station and wherein said measured signal strength of said first base station corresponds to a signal strength from a single sector thereof.
Claim 10
Dependent Claim
59 words
The method of claim 1 wherein said step of providing by said mobile unit to said system controller said measured signal strength of said first base station and said measured signal strength of said second base station is performed because said measured signal strength of said second base station exceeds said measured signal strength of said first base station.
Claim 11
Dependent Claim
44 words
The method of claim 1 wherein said step of providing by said mobile unit to said system controller said measured signal strength of said first base station and said measured signal strength of said second base station is performed periodically at a variable rate.
Claim 12
Dependent Claim
21 words
The method of claim 10 wherein said variable rate is a function of a rate at which of frame errors occur.
Claim 13
Dependent Claim
48 words
The method of claim 1 wherein said step of providing by said mobile unit to said system controller said measured signal strength of said first base station and said measured signal strength of said second base station is performed in response to a request from said system controller.
Claim 14
Dependent Claim
53 words
The method of claim 1 wherein said step of providing by said mobile unit to said system controller said measured signal strength of said first base station and said measured signal strength of said second base station is performed because said measured signal strength of said second base station exceeds a predetermined threshold.
Claim 15
Dependent Claim
45 words
The method of claim 1 further comprising the step of receiving and demodulating at said second base station an information signal transmitted by said mobile unit independent of whether said second base station has an entry on said first list or said new first list.
Claim 16
Dependent Claim
245 words
In a spread spectrum communication system in which a mobile user communicates with another system user via at least one base station in a system of base stations as directed by a system controller, a method for directing communications between said mobile unit user and said system of base stations comprising the steps of: communicating by said mobile unit with a first base station wherein said first base station has an entry on a first list stored in said mobile unit wherein said first list comprises an entry for each of the one or more base stations in active communication with said mobile unit; measuring at said mobile unit signal strength transmitted by a second base station during communication by said mobile unit with said first base station; comparing said measured signal strength of said second base station to a first predetermined level; providing by said mobile unit to said system controller a measurement of signal strength of said first base station and said second base station if said measured signal strength of the second base station exceeds said first predetermined level; and comparing at said system controller said measured signal strength of said first base station to a desired operating power and sending said mobile unit a new list comprising said second base station if said measured signal strength of said first base station is less than said desired operating power and said mobile unit is not in communication with any other base station.
Claim 17
Dependent Claim
245 words
In a spread spectrum communication system in which a mobile user communicates with another system user via at least one base station in a system of base stations as directed by a system controller, a method for directing communications between said mobile unit user and said system of base stations comprising the steps of: communicating by said mobile unit with a first base station wherein said first base station has an entry on a first list stored in said mobile unit wherein said first list comprises an entry for each of the one or more base stations in active communication with said mobile unit; measuring at said mobile unit signal strength transmitted by a second base station during communication by said mobile unit with said first base station; comparing said measured signal strength of said second base station to a first predetermined level; providing by said mobile unit to said system controller a measurement of signal strength of said first base station and said second base station if said measured signal strength of the second base station exceeds said first predetermined level; and comparing at said system controller said measured signal strength of said first base station to a desired operating power and sending said mobile unit a new list comprising said second base station if said measured signal strength of said first base station is less than said desired operating power and said mobile unit is not in communication with any other base station.
Claim 18
Dependent Claim
226 words
In a spread spectrum communication system in which a mobile unit user communicates with another system user via at least one base station in a system of base stations as directed by a system controller, a method for directing communications between said mobile unit user and said system of base stations comprising the steps of: communicating by said mobile unit with a first base station wherein said first base station has an entry on a first list stored in said mobile unit wherein said first list comprises an entry for each of the one or more base stations in active communication with said mobile unit; measuring, during communication by said mobile unit with said first base station, at said mobile unit a communication quality index corresponding to a second base station wherein said second base station does not have an entry on said first list; providing by said mobile unit to said system controller a measured quality index of said first base station and said measured quality index of said second base station; and comparing at said system controller said measured quality index of said first base station to a desired operating power and sending said mobile unit a new list comprising an entry for said second base station if said measured signal strength of said first base station does not meet said desired operating index.
Claim 19
Dependent Claim
226 words
In a spread spectrum communication system in which a mobile unit user communicates with another system user via at least one base station in a system of base stations as directed by a system controller, a method for directing communications between said mobile unit user and said system of base stations comprising the steps of: communicating by said mobile unit with a first base station wherein said first base station has an entry on a first list stored in said mobile unit wherein said first list comprises an entry for each of the one or more base stations in active communication with said mobile unit; measuring, during communication by said mobile unit with said first base station, at said mobile unit a communication quality index corresponding to a second base station wherein said second base station does not have an entry on said first list; providing by said mobile unit to said system controller a measured quality index of said first base station and said measured quality index of said second base station; and comparing at said system controller said measured quality index of said first base station to a desired operating power and sending said mobile unit a new list comprising an entry for said second base station if said measured signal strength of said first base station does not meet said desired operating index.
Claim 20
Dependent Claim
22 words
The method of claim 16 wherein said measured quality index of said first and second base stations is a frame erasure rate.
Claim 21
Dependent Claim
23 words
The method of claim 16 wherein said measured quality index of said first and second base stations is a signal to noise ratio.
Claim 22
Dependent Claim
22 words
The method of claim 16 wherein said measured quality index of said first and second base stations is a bit error rate.
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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) | 2003-12-05 | 2004-06-05 | 2004-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-05 | 2008-06-05 | 2008-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-05 | 2012-06-05 | 2012-12-05 | $7700.00 | Window Closed / Lapsed |