US5612703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
position determination in an integrated cellular communications system
Assignee: ATC Technologies LLC
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Filing: 1995-05-19
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Granted: 1997-03-18
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Expires: 2015-05-19
Abstract
Abstract A cellular communications system is provided having both surface and satellite nodes which are fully integrated for providing service over large areas. Position means are included for determining the position of a selected user unit within the cells by providing a timing signal to the selected user unit from at least one node, providing a timing response signal from the selected user unit in response to each timing signal, receiving the timing response signal by at least one node, measuring the response time of the user unit to the timing signal based on receipt of the timing response signal, and determining the position of the user unit based on the round trip time of transmission of the timing signal and receipt of the timing response signal. Preferably, the invention provides position determination in a cellular communications system using code division multiple access (CDMA) employing forward error correction coding (FECC) and spread spectrum waveforms.
Inventors
- 👤 Albert J. Mallinckrodt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:29
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/22; H04W52/228; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185; H04B7/1853; H04B7/18532; H04B7/18558; H04B7/204; H04B7/2041; H04B7/216; H04J; H04J13/00; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0071; H04L1/20; H04L5/00; H04L5/02; H04W52/225; H04B7/1851; H04B7/18517; H04B7/18534; H04B7/18539; H04B7/18543; H04W92/00; H04W92/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
194 words
A cellular communications system comprising: at least one node positioned so to establish a set of cells, each node including means for transmitting and receiving different predetermined sets of code division multiple access coded, digitally modulated spread spectrum waveforms; a plurality of user units within the cells, each user unit including means for communicating with at least one of said nodes and being operatively responsive to a predetermined one of the sets of code division multiple access coded waveforms to thereby establish selective communication with at least one of said nodes; and position determination means for determining the position of a selected user unit by providing a timing signal carried by one of the sets of code division multiple access coded waveforms to the user unit from one or more nodes, providing a timing response signal carried by one of the sets of code division multiple access coded waveforms from the selected user unit in response to each timing signal, receiving the timing response signal by at least one node, measuring the response time of the user unit to each timing signal, and determining the position of the user unit based on such measurements.
Claim 2
Dependent Claim
194 words
A cellular communications system comprising: at least one node positioned so to establish a set of cells, each node including means for transmitting and receiving different predetermined sets of code division multiple access coded, digitally modulated spread spectrum waveforms; a plurality of user units within the cells, each user unit including means for communicating with at least one of said nodes and being operatively responsive to a predetermined one of the sets of code division multiple access coded waveforms to thereby establish selective communication with at least one of said nodes; and position determination means for determining the position of a selected user unit by providing a timing signal carried by one of the sets of code division multiple access coded waveforms to the user unit from one or more nodes, providing a timing response signal carried by one of the sets of code division multiple access coded waveforms from the selected user unit in response to each timing signal, receiving the timing response signal by at least one node, measuring the response time of the user unit to each timing signal, and determining the position of the user unit based on such measurements.
Claim 3
Dependent Claim
183 words
In the operation of a cellular communications system having a plurality of user units and at least one cellular node so as to establish at least one cell, each node and user unit including means for transmitting and receiving different predetermined sets of code division multiple access coded digitally modulated spread spectrum waveforms, the method for determining the position of a selected user unit comprising: a) providing a timing signal carried by one of the sets of code division multiple access coded waveforms to the selected user unit from at least one node; b) providing a timing response signal carried by one of the sets of code division multiple access coded waveforms from the selected user unit in response to the timing signal; c) receiving the timing response signal by at least one node; d) measuring the response time of the user unit to the timing signal based on receipt of the timing response signal; and e) determining the position of the user unit based on the round trip time of transmission of the timing signal and receipt of the timing response signal.
Claim 4
Dependent Claim
183 words
In the operation of a cellular communications system having a plurality of user units and at least one cellular node so as to establish at least one cell, each node and user unit including means for transmitting and receiving different predetermined sets of code division multiple access coded digitally modulated spread spectrum waveforms, the method for determining the position of a selected user unit comprising: a) providing a timing signal carried by one of the sets of code division multiple access coded waveforms to the selected user unit from at least one node; b) providing a timing response signal carried by one of the sets of code division multiple access coded waveforms from the selected user unit in response to the timing signal; c) receiving the timing response signal by at least one node; d) measuring the response time of the user unit to the timing signal based on receipt of the timing response signal; and e) determining the position of the user unit based on the round trip time of transmission of the timing signal and receipt of the timing response signal.
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) | 2000-03-17 | 2000-09-16 | 2001-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-17 | 2004-09-16 | 2005-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-17 | 2008-09-16 | 2009-03-18 | $7700.00 | Window Closed / Lapsed |