US6226525B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control of LMDS/LMCS base station to provide rain fade compensation
Assignee: Quarterhill Inc
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Filing: 1998-09-16
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Granted: 2001-05-01
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Expires: 2018-09-16
Abstract
Abstract A base station power control for dynamically introducing transmission power to compensate for rain fade in a broadband wireless system operating at millimeter wave frequencies. The base station periodically polls a selected network interface unit at a customer site to obtain status information such as the power level of the received signal. Variations in the power level of the received signal, indicative of variations in the attenuation of the wireless link, are used by the base station power controller to appropriately adjust transmission power. Status information collected by the base station can also include signal to noise level data and the bit error rate.
Inventors
- 👤 Eric H. Boch
- 👤 Jung F. Yee
- 👤 John Scott Ployer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:52
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/06; H04W52/14; H04W52/143; H04W52/146; H04W52/18; H04W52/28; H04W52/283; H04W52/288
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
104 words
In a broadband wireless system having a base station for communicating with a set of network interface units (NIUs) over a wireless link, a system for compensating for time variable path attenuation of the link comprising: means for designating a reference NIU from the set of NIUs; polling means at the base station to periodically obtain status information from the designated reference NIU; and control means at the base station to adjust transmission power of the base station to the set of NIUs in accordance with the status information obtained from the reference NIU to compensate for time variable path attenuation of the link.
Claim 2
Dependent Claim
104 words
In a broadband wireless system having a base station for communicating with a set of network interface units (NIUs) over a wireless link, a system for compensating for time variable path attenuation of the link comprising: means for designating a reference NIU from the set of NIUs; polling means at the base station to periodically obtain status information from the designated reference NIU; and control means at the base station to adjust transmission power of the base station to the set of NIUs in accordance with the status information obtained from the reference NIU to compensate for time variable path attenuation of the link.
Claim 3
Dependent Claim
24 words
A system as defined in claim 1 wherein said broadband wireless system is a local multipoint delivery system (LMDS) operating at millimeter wave frequencies.
Claim 4
Dependent Claim
41 words
A system as defined in claim 2 wherein each of said NIUs is adapted to receive communication from said base station in a point to multipoint format and to transmit communication to said base station in a point to point form.
Claim 5
Dependent Claim
30 words
A system as defined in claim 3 wherein a plurality of radio frequency (RF) carriers are used to transmit digital communication between said base station and said network interface units.
Claim 6
Dependent Claim
35 words
A system as defined in claim 4 wherein a plurality of said network interface units are located within a sector of a cell each communicating with a base station at one of said RF carriers.
Claim 7
Dependent Claim
24 words
A system as defined in claim 1 wherein the NIU which is the furthest from the base station is designated as the reference NIU.
Claim 8
Dependent Claim
38 words
A system as defined in claim 1 wherein said polling means requests status information from said reference NIU via a downlink signal on a downlink path and receives status information from said reference NIU over an uplink path.
Claim 9
Dependent Claim
28 words
A system as defined in claim 7 wherein a dynamic transmission power level on said downlink path is used by said reference NIU to provide the status information.
Claim 10
Dependent Claim
28 words
A system as defined in claim 8 wherein uplink transmission from said reference NIU to said base station is adjusted in accordance with first and second adjustment periods.
Claim 11
Dependent Claim
31 words
A system as defined in claim 9 wherein said first adjustment period is shorter than said second adjustment period and said second adjustment period is similar to the periodic polling period.
Claim 12
Dependent Claim
25 words
A system as defined in claim 7 wherein a signal to noise value associated with said downlink signal is used to provide the status information.
Claim 13
Dependent Claim
23 words
A system as defined in claim 7 wherein said status information is based on a bit error rate (BER) of said downlink signal.
Claim 14
Dependent Claim
40 words
A system as defined in claim 1 wherein each NIU in said set of NIUs is located within a cell and said reference NIU is an NIU in said set of NIUs located closest to the edge of said cell.
Claim 15
Dependent Claim
41 words
A system as defined in claim 1 wherein said reference NIU is an NIU in said set of NIUs known from previously obtained information to be the NIU in said set of NIUs most likely to experience time variable path attenuation.
Claim 16
Independent Claim
92 words
A method of controlling the power level of transmission from a base station to a set of network interface units (NIUs) over a wireless link in a cellular, broadband wireless communication system in order to compensate for time dependent path attenuation, the method comprising: designating a reference NIU from said set of NIUs; periodically polling the designated reference NIU for status information; and adjusting transmission power of said base station to the set of NIUs in accordance with said status information from said reference NIU to compensate for time dependent path attenuation.
Claim 17
Independent Claim
92 words
A method of controlling the power level of transmission from a base station to a set of network interface units (NIUs) over a wireless link in a cellular, broadband wireless communication system in order to compensate for time dependent path attenuation, the method comprising: designating a reference NIU from said set of NIUs; periodically polling the designated reference NIU for status information; and adjusting transmission power of said base station to the set of NIUs in accordance with said status information from said reference NIU to compensate for time dependent path attenuation.
Claim 18
Dependent Claim
23 words
A method as defined in claim 15 wherein said designated NIU is the NIU which is the furthest away from the base station.
Claim 19
Dependent Claim
22 words
A method as defined in claim 15 wherein a closed loop downlink power control is used to adjust base station transmission power.
Claim 20
Dependent Claim
26 words
A method as defined in claim 17 further including both a short loop and a long loop uplink power control to adjust base station power transmission.
Claim 21
Dependent Claim
30 words
A method as defined in claim 18 wherein the sampling interval of said short loop uplink power control is shorter than the sampling interval of long loop uplink power control.
Claim 22
Dependent Claim
29 words
A method as defined in claim 19 wherein the power adjustment interval at said base station is greater than the sampling interval of said long loop uplink power control.
Claim 23
Dependent Claim
40 words
A method as defined in claim 15 wherein each NIU in said set of NIUs is located within a cell and said reference NIU is an NIU in said set of NIUs located closest to the edge of said cell.
Claim 24
Dependent Claim
43 words
A method as defined in claim 15 further comprising designating as the reference NIU the NIU in said set of NIUs known from previously obtained information to be the NIU in said set of NIUs most likely to experience time variable path attenuation.
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) | 2004-04-30 | 2004-10-30 | 2005-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-04-30 | 2008-10-30 | 2009-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-04-30 | 2012-10-30 | 2013-05-01 | $7700.00 | Window Closed / Lapsed |