US5809431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Local multipoint distribution system
Assignee: Alcatel USA Sourcing Inc
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Filing: 1995-12-06
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Granted: 1998-09-15
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Expires: 2015-12-06
Abstract
Abstract A local multipoint distribution system having a head end coupled to a plurality of base stations with each base station constituting a cell. Each base station has a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of the cell with RF communication signals. A plurality of RF subscriber stations for each sector of a cell, with each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector. Time division multiple access control is provided at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so that the subscribers in a given sector do not interfere with each others' transmissions, respectively. The power level transmitted by the subscribers are adjusted or controlled so that the subscriber signals arrive at the respective base stations at about the same power level. The cells can be hexagonally shaped and the sectors arranged such that the subscribers do not radiate directly into the three db beam width of base stations of immediately adjacent cells. Alternatively, the cells can be rectangularly shaped and the sectors of the cells arranged such that the subscribers do not radiate directly into the three db beam width of base stations of immediately adjacent cells.
Inventors
- 👤 Herman Bustamante
- 👤 Horen Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
H; H04; H04W; H04W56/00; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/0491; H04B7/10; H04W16/00; H04W16/24; H04W52/00; H04W52/04; H04W52/30; H04W52/34; H04W84/00; H04W84/02; H04W84/10; H04W84/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
252 words
A local multipoint distribution system comprising: a head end coupled to a plurality of base stations, each base station constituting a cell, each base station having a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of said cell with RF communication signals, a plurality of RF subscriber stations for each sector of a cell, each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector, time division multiple access control means at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so the subscribers in a given sector do not interfere with each others transmissions, respectively, means controlling the transmitted power level such that all subscriber signals arrive at their respective base stations at about the same power level, means controlling the transmit signal timing such that all subscriber signals arrive at their respective base stations at the exclusively assigned time thereby minimizing the possibilities of mutual interference and means controlling the transmit signal frequency such that all subscriber signals operate at their proper assigned frequency and are orthogonal to all other carrier frequencies received by the base station, and wherein each subscriber station first, in order to initiate operation, is operated in a receive-mode only to detect a stable downstream frequency from a head end signal and detect any received frequency error and adjust its initial frequency of operation in accordance therewith.
Claim 2
Dependent Claim
252 words
A local multipoint distribution system comprising: a head end coupled to a plurality of base stations, each base station constituting a cell, each base station having a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of said cell with RF communication signals, a plurality of RF subscriber stations for each sector of a cell, each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector, time division multiple access control means at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so the subscribers in a given sector do not interfere with each others transmissions, respectively, means controlling the transmitted power level such that all subscriber signals arrive at their respective base stations at about the same power level, means controlling the transmit signal timing such that all subscriber signals arrive at their respective base stations at the exclusively assigned time thereby minimizing the possibilities of mutual interference and means controlling the transmit signal frequency such that all subscriber signals operate at their proper assigned frequency and are orthogonal to all other carrier frequencies received by the base station, and wherein each subscriber station first, in order to initiate operation, is operated in a receive-mode only to detect a stable downstream frequency from a head end signal and detect any received frequency error and adjust its initial frequency of operation in accordance therewith.
Claim 3
Dependent Claim
193 words
A local multipoint distribution system comprising: a head end coupled to a plurality of base stations, each base station constituting a cell, each base station having a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of said cell with RF communication signals, a plurality of RF subscriber stations for each sector of a cell, each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector, time division multiple access control means at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so the subscribers in a given sector do not interfere with each others transmissions, respectively, and means controlling the transmitted power level such that all subscriber signals arrive at their respective base stations at about the same power level wherein each subscriber station first, in order to initiate operation, is operated in the receive mode only to detect a stable downstream frequency from a head end signal, and detect any received frequency error and adjust its initial frequency of operation in accordance therewith.
Claim 4
Dependent Claim
193 words
A local multipoint distribution system comprising: a head end coupled to a plurality of base stations, each base station constituting a cell, each base station having a plurality of sector beam antennas, each sector beam antenna illuminating a predetermined sector of said cell with RF communication signals, a plurality of RF subscriber stations for each sector of a cell, each subscriber station having a high gain antenna with a narrow beam width oriented toward the sector beam antenna oriented toward its assigned sector, time division multiple access control means at each subscriber station operated such that each subscriber transmits at a time different from the other subscribers in its sector so the subscribers in a given sector do not interfere with each others transmissions, respectively, and means controlling the transmitted power level such that all subscriber signals arrive at their respective base stations at about the same power level wherein each subscriber station first, in order to initiate operation, is operated in the receive mode only to detect a stable downstream frequency from a head end signal, and detect any received frequency error and adjust its initial frequency of operation in accordance therewith.
Claim 5
Dependent Claim
41 words
The local multipoint distribution system defined in claim 2 wherein said cells are hexagonally shaped and said sectors are arranged such that the subscribers do not radiate directly into the three db beam width of base stations of immediately adjacent cells.
Claim 6
Dependent Claim
44 words
The local multipoint distribution system defined in claim 2 wherein said cells are rectangularly shaped and the sectors of said cells are arranged such that the subscribers do not radiate directly into the three db beam width of base stations of immediately adjacent cells.
Claim 7
Dependent Claim
52 words
The local multipoint distribution system defined in claim 2 wherein each said subscriber station includes means to measure the power level from the base station, and means for comparing the power level from the base station with a reference and adjusting the power at which said subscriber station transmits in accordance therewith.
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) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-14 | 2006-03-16 | 2006-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-14 | 2010-03-16 | 2010-09-15 | $7700.00 | Window Closed / Lapsed |