US5625876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for performing handoff between sectors of a common base station
Assignee: Qualcomm Inc
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Filing: 1995-03-13
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Granted: 1997-04-29
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Expires: 2015-03-13
Abstract
Abstract A method and apparatus providing softer handoff of a mobile unit between sectors of a common base station. A sectorized base station comprises a set of demodulation elements. Each demodulation element may be assigned to a signal from one of a plurality of sectors. The output of the demodulators are combined before the decoding process independent of the sector from which the data originated. This configuration provides improved output data reliability, more stable power control, and more efficient use of resources at the base station.
Inventors
- 👤 Klein S. Gilhousen
- 👤 Roberto Padovani
- 👤 Lindsay A. Weaver, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:38
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/06; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/0491; H04W52/00; H04W52/04; H04W52/06; H04W52/14; H04W52/146; H04W52/38; H04W52/40; H04W16/00; H04W16/24; H04W36/16; H04W36/18
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
175 words
A base station transceiver system for interfacing with a mobile unit via an upconverted radio frequency signal comprising: a first radio frequency processing system for down converting said upconverted radio frequency signal to a first baseband signal; a second radio frequency processing system for down converting said upconverted radio frequency signal to a second baseband signal; a first demodulation element for converting said first baseband signal to a first set of estimation data respectively; a second demodulation element for converting said second baseband signal to a second set of estimation data; a combiner for combining said first set of estimation data and said second set of estimation data to form a single set of estimation data; a decoder for converting said single set of estimation data to digital data; a control system for generating control information in response to said first and second sets of estimation data; and an interface port for transmitting said first baseband signal and said second baseband signal to said first and second demodulation element in accordance with said control information.
Claim 2
Dependent Claim
175 words
A base station transceiver system for interfacing with a mobile unit via an upconverted radio frequency signal comprising: a first radio frequency processing system for down converting said upconverted radio frequency signal to a first baseband signal; a second radio frequency processing system for down converting said upconverted radio frequency signal to a second baseband signal; a first demodulation element for converting said first baseband signal to a first set of estimation data respectively; a second demodulation element for converting said second baseband signal to a second set of estimation data; a combiner for combining said first set of estimation data and said second set of estimation data to form a single set of estimation data; a decoder for converting said single set of estimation data to digital data; a control system for generating control information in response to said first and second sets of estimation data; and an interface port for transmitting said first baseband signal and said second baseband signal to said first and second demodulation element in accordance with said control information.
Claim 3
Dependent Claim
65 words
The base station transceiver of claim 1 further comprising: first and second modulation elements for modulating transmit digital data and generating a first and second set of transmit baseband data; first and second transmit processing systems for generating upconverted transmit data by upconverting said transmit baseband data, wherein said first and second transmit processing systems are associated with said first and second receive processing system.
Claim 4
Dependent Claim
42 words
The base station transceiver of claim 2 further comprising: a second interface port for receiving said transmit digital data and providing said transmit digital data to said first and second modulation elements in response to additional control information from said control system.
Claim 5
Dependent Claim
31 words
The base station transceiver of claim 2 wherein: said control system generates power control information; and said power control information is transmitted from both said first and second transmit processing systems.
Claim 6
Dependent Claim
36 words
The base station transceiver system of claim 1 wherein said first radio frequency processing unit and said second radio frequency processing unit are configured to receive radio frequency signals generated in coverage areas that partially overlap.
Claim 7
Dependent Claim
187 words
A cellular telephone system comprising: a mobile unit for generating a reverse link signal and receiving a forward link signal; a first set of mobile units for generating a first set of other reverse link signals; a second set of mobile units for generating a second set of other reverse link signals; a first base station transceiver system having a first radio frequency signal processing system for receiving a first instance of said reverse link signal, a second radio frequency processing system for receiving a second instance of said reverse link signal, and a signal processing system for combining said first and second instances to generate a first digital signal; a second base station transceiver system for receiving a third instance of said reverse link signal and for generating a second digital signal in response; a base station controller system combining said first digital signal and said second digital signal into a third digital signal, wherein said first instance is received along with said first set of other reverse link signals, and said second instance is received along with said second set of other reverse link signals.
Claim 8
Dependent Claim
187 words
A cellular telephone system comprising: a mobile unit for generating a reverse link signal and receiving a forward link signal; a first set of mobile units for generating a first set of other reverse link signals; a second set of mobile units for generating a second set of other reverse link signals; a first base station transceiver system having a first radio frequency signal processing system for receiving a first instance of said reverse link signal, a second radio frequency processing system for receiving a second instance of said reverse link signal, and a signal processing system for combining said first and second instances to generate a first digital signal; a second base station transceiver system for receiving a third instance of said reverse link signal and for generating a second digital signal in response; a base station controller system combining said first digital signal and said second digital signal into a third digital signal, wherein said first instance is received along with said first set of other reverse link signals, and said second instance is received along with said second set of other reverse link signals.
Claim 9
Dependent Claim
49 words
The cellular telephone system of claim 6 wherein: said first base station transceiver system transmits substantially similar power control information to said mobile unit through said first and second radio frequency processing systems; and said second base station transceiver system transmits different power control information to said mobile unit.
Claim 10
Dependent Claim
42 words
The cellular telephone system of claim 6 wherein said mobile unit maintains an interface with said first and second base station transceiver systems so long as a usable forward link signal is received from said first and second base station transceiver systems.
Claim 11
Dependent Claim
177 words
A base station transceiver system for receiving a reverse link radio frequency signal comprising: a first demodulation element for converting said reverse link radio frequency signal to a first demodulated signal; a second demodulation element for converting said reverse link radio frequency signal to a second demodulated signal; a combiner for combining said first and second demodulated signals to produce a third demodulated signal; a decoder for converting said third demodulated signal to digital data; a first receive processing system for receiving said reverse link radio frequency signal in conjunction with a first set of other reverse link radio frequency signals, and for providing said reverse link radio frequency signal and said first set of other reverse link radio frequency signals to said first demodulation element; and a second receive processing system for receiving said reverse link radio frequency signal conjunction with a second set of other reverse link radio frequency signals, and for providing said reverse link radio frequency signal and said second set of other reverse link radio frequency signals to said second demodulation element.
Claim 12
Dependent Claim
177 words
A base station transceiver system for receiving a reverse link radio frequency signal comprising: a first demodulation element for converting said reverse link radio frequency signal to a first demodulated signal; a second demodulation element for converting said reverse link radio frequency signal to a second demodulated signal; a combiner for combining said first and second demodulated signals to produce a third demodulated signal; a decoder for converting said third demodulated signal to digital data; a first receive processing system for receiving said reverse link radio frequency signal in conjunction with a first set of other reverse link radio frequency signals, and for providing said reverse link radio frequency signal and said first set of other reverse link radio frequency signals to said first demodulation element; and a second receive processing system for receiving said reverse link radio frequency signal conjunction with a second set of other reverse link radio frequency signals, and for providing said reverse link radio frequency signal and said second set of other reverse link radio frequency signals to said second demodulation element.
Claim 13
Dependent Claim
33 words
The base station transceiver system of claim 9 further comprising a first transmit processing unit for transmitting to a first sector; and a second transmit processing unit for transmitting to a second sector.
Claim 14
Dependent Claim
68 words
The base station transceiver system of claim 9 further comprising: an interface port for coupling said first demodulation element to said first receive processing system if said first receive processing system is receiving a reverse link signal that requires demodulation, and for coupling said first demodulation element to said second receive processing system if said second receive processing system is receiving a reverse link signal that requires demodulation.
Claim 15
Dependent Claim
162 words
A base station transceiver system for receiving a reverse link radio frequency signal comprising: a first demodulation element for converting said reverse link radio frequency signal to a first demodulated signal; a second demodulation element for converting said reverse link radio frequency signal to a second demodulated signal; a combiner for combining said first and second demodulated signals to produce a third demodulated signal; and a decoder for converting said third demodulated signal to digital data; a control system for generating a first set of power control commands directed to said mobile unit and a second set of power control commands directed to other mobile units; a first transmit processing unit for transmitting said first set of power control commands along with a first sub-set of said second set of power control commands; and a second power transmit processing unit for transmitting said first set of power control commands along with a second sub-set of said second set of power control commands.
Claim 16
Dependent Claim
162 words
A base station transceiver system for receiving a reverse link radio frequency signal comprising: a first demodulation element for converting said reverse link radio frequency signal to a first demodulated signal; a second demodulation element for converting said reverse link radio frequency signal to a second demodulated signal; a combiner for combining said first and second demodulated signals to produce a third demodulated signal; and a decoder for converting said third demodulated signal to digital data; a control system for generating a first set of power control commands directed to said mobile unit and a second set of power control commands directed to other mobile units; a first transmit processing unit for transmitting said first set of power control commands along with a first sub-set of said second set of power control commands; and a second power transmit processing unit for transmitting said first set of power control commands along with a second sub-set of said second set of power control commands.
Claim 17
Dependent Claim
30 words
The base station transceiver system of claim 12 wherein said first transmit processing unit transmits to a first sector and said second transmit processing unit transmits to a second sector.
Claim 18
Dependent Claim
68 words
The base station transceiver system of claim 12 further comprising: an interface port for coupling said first demodulation element to said first receive processing system if said first receive processing system is receiving a reverse link signal that requires demodulation, and for coupling said first demodulation element to said second receive processing system if said second receive processing system is receiving a reverse link signal that requires demodulation.
References Cited (Backward Citations)
US4123718A
Cited
US4004224A
Cited
US3819872A
Cited
US4112257A
Cited
US4211894A
Cited
US4222115A
Cited
US4369520A
Cited
US4309771A
Cited
US4398063A
Cited
US4580262A
Cited
US4596042A
Cited
US4495648A
Cited
US4475010A
Cited
US4641322A
Cited
US4608711A
Cited
US4697260A
Cited
US4672658A
Cited
US4765753A
Cited
US4811421A
Cited
US4737978A
Cited
US4718081A
Cited
US4771448A
Cited
US4723266A
Cited
US4759051A
Cited
US4955082A
Cited
US4975939A
Cited
US5109528A
Cited
US5327577A
Cited
WO1990006416A1
Cited
US5127100A
Cited
US5109390A
Cited
WO1991007036A1
Cited
US5265119A
Cited
US5101501A
Cited
US5056109A
Cited
US5134715A
Cited
US5054110A
Cited
US5175878A
Cited
US5103459B1
Cited
US5309474A
Cited
US5103459A
Cited
WO1992001854A1
Cited
US5369663A
Cited
WO1992017954A1
Cited
US5243598A
Cited
US5164958A
Cited
US5301352A
Cited
US5345467A
Cited
US5179571A
Cited
EP0532485A2
Cited
US5267261A
Cited
US5345499A
Cited
US5490165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-28 | 2000-10-28 | 2001-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-28 | 2004-10-28 | 2005-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-28 | 2008-10-28 | 2009-04-29 | $7700.00 | Window Closed / Lapsed |