US6169731B1
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Method and apparatus for signal acquisition and power control
Assignee: Google Technology Holdings LLC
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Filing: 1998-03-10
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Granted: 2001-01-02
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Expires: 2018-03-10
Abstract
Abstract A call setup process ( 200 ) has a fast and robust preamble signal acquisition and acknowledgement procedure ( 400 ). The procedure ( 400 ) is a multistage search technique for first identifying with high probability the preamble signal and for verifying signal acquisition. The procedure ( 400 ) further includes power control ( 408/426/428 ) and rate determination ( 430 ) capability for enhanced call setup processing.
Inventors
- 👤 Kenneth A. Stewart
- 👤 Sanjeev Garg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:39
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/20; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7073; H04B1/7075; H04B1/7077; H04W52/38; H04W52/50; H04B1/7097; H04B1/711; H04B1/7115
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
97 words
A method of controlling a transmit power of a remote communication unit operating in a wireless communication system, the wireless communication system including at least one base communication station, the method comprising: transmitting from the remote communication unit a preamble message; receiving at the base communication station the preamble message; evaluating the content of the received preamble message and generating a quality metric, wherein the quality metric comprises one of a group consisting of a search statistic and a bit error rate; and adjusting the transmit power of the remote communication unit based upon the quality metric.
Claim 2
Independent Claim
97 words
A method of controlling a transmit power of a remote communication unit operating in a wireless communication system, the wireless communication system including at least one base communication station, the method comprising: transmitting from the remote communication unit a preamble message; receiving at the base communication station the preamble message; evaluating the content of the received preamble message and generating a quality metric, wherein the quality metric comprises one of a group consisting of a search statistic and a bit error rate; and adjusting the transmit power of the remote communication unit based upon the quality metric.
Claim 3
Dependent Claim
37 words
The method of claim 1 , wherein the preamble message comprises a frame of data, and the step of evaluating the content of the preamble message comprises comparing a received frame content with an anticipated frame content.
Claim 4
Dependent Claim
33 words
The method of claim 2 , wherein the frame of data includes a frame type, and wherein the step of evaluating the content of the preamble message further comprises determining the frame type.
Claim 5
Dependent Claim
43 words
The method of claim 1 , wherein the wireless communication system comprises a communication system in accordance with one of a group consisting of: a code division multiple access communication system, a time division multiple access communication system, an analog cellular communication system.
Claim 6
Independent Claim
88 words
A method for processing a communication request in a communication system comprising: receiving at a base station a communication request signal from a communication unit operating in the communication system; searching the communication request signal for multipath components; verifying the existence of the multipath components; recovering information from the multipath components; comparing the recovered information to predetermined communication request information; and sending an acknowledgment signal from the base station to the communication unit when the recovered information corresponds to the predetermined communication request information with a predetermined certainty.
Claim 7
Independent Claim
88 words
A method for processing a communication request in a communication system comprising: receiving at a base station a communication request signal from a communication unit operating in the communication system; searching the communication request signal for multipath components; verifying the existence of the multipath components; recovering information from the multipath components; comparing the recovered information to predetermined communication request information; and sending an acknowledgment signal from the base station to the communication unit when the recovered information corresponds to the predetermined communication request information with a predetermined certainty.
Claim 8
Dependent Claim
32 words
The method of claim 5 , wherein the step of searching the communication request signal for multipath components comprises generating a search statistic corresponding to each of a plurality of spaced delays.
Claim 9
Dependent Claim
43 words
The method of claim 6 , wherein the step of generating a search statistic comprises integrating, over a number of Walsh symbols, the energy of a zeroth Fast Hadamard Transform output despread at a pseudonoise offset associated with each of the spaced delays.
Claim 10
Dependent Claim
21 words
The method of claim 7 , wherein the number of Walsh symbols is the range of 2 and 5 Walsh symbols.
Claim 11
Dependent Claim
32 words
The method of claim 6 , wherein the step of generating a search statistic comprises generating over a specific period the energy of a pilot signal associated with the communication request signal.
Claim 12
Dependent Claim
15 words
The method of claim 9 , wherein the pilot signal comprises a prior known sequence.
Claim 13
Dependent Claim
24 words
The method of claim 6 , comprising the step of ranking the plurality of spaced delays according to a value of the search statistic.
Claim 14
Dependent Claim
34 words
The method of claim 6 , wherein the step of receiving at a base station a communication request signal comprises receiving at a pair of antennas at the base station a communication request signal.
Claim 15
Dependent Claim
41 words
The method of claim 12 , wherein the step of generating a statistic corresponding to each of a plurality of spaced delays comprises generating a statistic corresponding to each of a plurality of delays at each of the pair of antennas.
Claim 16
Dependent Claim
42 words
The method of claim 13 , wherein the step of generating a statistic comprises integrating, over a number of Walsh symbols, the energy of a zeroth Fast Hadamard Transform output despread at a pseudonoise offset associated with each of the spaced delays.
Claim 17
Dependent Claim
24 words
The method of claim 14 , comprising the step of ranking the plurality of spaced delays according to a value of the search statistic.
Claim 18
Dependent Claim
34 words
The method of claim 15 , wherein the step of ranking the plurality of spaced delays comprises summing, for corresponding pseudonoise offsets, search statistics for spaced delays at each of the pair of antennas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-01-02 | 2004-07-03 | 2005-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-01-02 | 2008-07-03 | 2009-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-01-02 | 2012-07-03 | 2013-01-02 | $7700.00 | Window Closed / Lapsed |