EP0741467A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A method and apparatus for power control in wireless networks
Assignee: AT&T Inc
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Filing: 1996-04-17
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Granted: —
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Expires: 2016-04-17
Abstract
Abstract A method and apparatus use a set of parameters (310) characterizing an interference signal at a base unit for determining power levels for signals transmitted from a communications device to the base unit. The set of parameters comprises second or higher order statistics characterizing the interference signal, and the parameters are used to determine (320) a desired power level for signals received at the base unit. The desired power level is communicated to a communications device via a pilot signal transmitted by the base unit at a predetermined level (330). The predetermined level and the power of the received pilot signal (410) are used to compute a path gain (420) between the base unit and communications device. The path gain and desired power level are then used to determine the power level of signals transmitted from the communications device to the base unit (430).
Inventors
- 👤 Debasis Mitra
- 👤 John A. Morrison
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 10:05
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/24; H04W52/243; H04W52/30; H04W52/34; H04W52/343; H04W52/06; H04W52/08; H04W52/14; H04W52/146; H04W52/22; H04W52/225; H04W52/226; H04W52/26; H04W52/265; H04W52/346
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
69 words
A method comprising the steps of: receiving an interference signal at a base unit, determining, over a time interval, a set of parameters characterizing said interference signal received at said base unit, said set of parameters comprising second or higher order statistics, and determining, based on said set of parameters, a desired power level at said base unit for signals transmitted from a communications device to said base unit.
Claim 2
Dependent Claim
30 words
The method of claim 1 further comprising the step of: transmitting a signal to said communications device from said base unit, said signal comprising information about said desired power level.
Claim 3
Dependent Claim
24 words
The method of claim 2 wherein said signal transmitted to said communications device is transmitted from said base unit at a transmit power level.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein said signal transmitted to said communications device comprises information about a transmit power level at which said signal is transmitted.
Claim 5
Dependent Claim
65 words
The method of claim 3 or 4 further comprising the step of: measuring, at said communications device, the received power level of said signal transmitted from said base unit at said transmit power level, and determining a path gain between said communications device and said base unit as a function of said transmit power level and of said measured received power level of said signal.
Claim 6
Dependent Claim
45 words
The method of claim 5 further comprising the step of: transmitting a signal at a power level from said communications device to said base unit, said power level of said transmitted signal being a function of said determined path gain and said desired power level.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein said set of parameters comprises a variance of said interference signal received at said base unit.
Claim 8
Independent Claim
123 words
A method of operating a network including regulating a power level of a signal transmitted from a communications device to a base unit, the method comprising the steps of: determining a desired received power level of said signal transmitted from said communications device to said base unit, said desired received power level being based on a set of statistics characterizing an interference signal received at said base unit, the set of statistics comprising second or higher order statistics, determining a signal path gain between said communications device and said base unit, and regulating said power level of said signal transmitted from said communications device to said base unit as a function of said signal path gain and of said desired received power level.
Claim 9
Dependent Claim
73 words
The method of claim 8 wherein the step of determining a signal path gain comprises the steps of: receiving, at said communications device, a pilot signal transmitted at a transmit power level from said base unit, and measuring, at said communications device, a received power level of said pilot signal, and determining said signal path gain based on said measured received power level of said pilot signal and on said transmit power level.
Claim 10
Dependent Claim
88 words
The method of claim 8 wherein the step of determining a signal path gain comprises the steps of: receiving, at said communications device, a pilot signal transmitted from said base unit, said pilot signal comprising information about a transmit power level at which said pilot signal was transmitted from said base unit, measuring, at said communications device, a received power level of said pilot signal, and determining said signal path gain based on said transmit power level and on said measured received power level of said pilot signal.
Claim 11
Dependent Claim
22 words
The method of claim 8 wherein said set of statistics comprises a variance of said interference signal received at said base unit.
Claim 12
Dependent Claim
162 words
In a system comprising a set of base stations, wherein each base station in said set of base stations communicates with an associated set of one or more communications devices, a method of operating a system by regulating a power level of a signal transmitted from a particular communications device in the set of communications devices associated with a given base station, the method comprising the steps of: determining a desired received power level of a signal transmitted from said particular communications device to said given base station, said desired received power level being based on a set of statistics characterizing an interference signal at said given base station, the set of statistics comprising second or higher order statistics, determining a signal path gain between said particular communications device and said given base station, and regulating said power level of said signal transmitted from said particular communications device as a function of said signal path gain and said desired received power level.
Claim 13
Dependent Claim
75 words
The method of claim 12 wherein the step of determining a signal path gain comprises the steps of: receiving, at said particular communications device, a pilot signal transmitted at a transmit power level from said given base station, measuring, at said particular communications device, a received power level of said pilot signal, and determining said signal path gain based on said measured received power level of said pilot signal and on said transmit power level.
Claim 14
Dependent Claim
87 words
The method of claim 12 wherein the step of determining a signal path gain comprises the steps of: receiving, at said particular communications device, a pilot signal transmitted from said given base station, said pilot signal comprising information about a transmit power level at which said pilot signal was transmitted, measuring, at said particular communications device, a received power level of said pilot signal, and determining said signal path gain based on said measured received power level of said pilot signal and on said transmit power level.
Claim 15
Dependent Claim
27 words
The method of claim 12 wherein said interference signal comprises signals, received at said given base station, transmitted by communications devices other than said particular communications device.
Claim 16
Dependent Claim
23 words
The method of claim 12 wherein said set of statistics comprises a variance of said interference signal received at said given base station.
Claim 17
Dependent Claim
119 words
The method of claim 16 wherein said given base station is the j th base station in said set of base stations and wherein said desired power signal, P j , for the j th base station at a time ( n + 1) is determined according to: where I ¯ j (n) is the average of said interference signal at said j t h base station at time n, V ¯ j (n) is the variance of said interference signal at said j th base station at time n, α is a parameter related to a quality of service requirement, and v j is a function of a probability measure that said quality of service requirement is met.
Claim 18
Independent Claim
117 words
A method comprising the steps of: measuring, at a communications device, the power level of a pilot signal, said pilot signal having been transmitted from a base unit, said pilot signal comprising information about a desired power level of signals received at said base unit, wherein said desired power level is based on measurements of an interference signal received at said base unit, said measurements comprising second or higher order statistics characterizing said interference signal, determining a path gain between said base unit and said communications device, and transmitting a signal at a transmitted power level from said communications device, wherein said transmitted power level is a function of said path gain and said desired power level.
Claim 19
Dependent Claim
20 words
The method of claim 18 wherein said pilot signal is transmitted from said base unit at a transmit power level.
Claim 20
Dependent Claim
23 words
The method of claim 18 wherein said pilot signal comprises information about a transmit power level at which said pilot signal was transmitted.
Claim 21
Dependent Claim
31 words
The method of claim 19 or 20 wherein the determination of said path gain is based on said transmit power level and said measured power level of said received pilot signal.
Claim 22
Dependent Claim
24 words
The method of claim 18 wherein said second order or higher statistics comprise a variance of said interference signal received at said base unit.
Claim 23
Dependent Claim
123 words
The method of claim 7,11 or 18 wherein said base unit is the j th base unit in a plurality of base units and wherein said desired power signal, P j , for the j th base unit at a time ( n + 1) is determined according to: where I ¯ j ( n ) is the average of said interference signal at said base unit j at time n , V ¯ j ( n ) is the variance of said interference signal at said j th base unit at time n, α is a parameter related to a quality of service requirement, and v j is a function of a probability measure that said quality of service requirement is met.
Claim 24
Dependent Claim
20 words
The method of claim 1,8 or 18 wherein said base unit is a base station in a cellular communications system.
Claim 25
Dependent Claim
17 words
The method of claim 24 wherein said cellular communications system is a spread spectrum multiple access system.
Claim 26
Dependent Claim
27 words
The method of claim 1,8 or 18 wherein said interference signal comprises signals, received at said base unit, transmitted by communications devices other than said communications device.
Claim 27
Independent Claim
73 words
An apparatus comprising: means for receiving an interference signal at a base unit, means for determining, over a time interval, a set of parameters characterizing said interference signal received at said base unit, said set of parameters comprising second or higher order statistics, and means for determining, based on said said set of parameters, a desired power level at said base unit for signals transmitted from a communications device to said base unit.
Claim 28
Dependent Claim
29 words
The apparatus of claim 27 further comprising: means for transmitting a signal to said communications device from said base unit, said signal comprising information about said desired power level.
Claim 29
Independent Claim
23 words
The apparatus of claim 28wherein said signal transmitted to said communications device is transmitted from said base unit at a transmit power level.
Claim 30
Dependent Claim
26 words
The apparatus of claim 28 wherein said signal transmitted to said communications device comprises information about a transmit power level at which said signal is transmitted.
Claim 31
Dependent Claim
22 words
The apparatus of claim 27 wherein said set of parameters comprises a variance of said interference signal received at said base unit.
Claim 32
Independent Claim
128 words
A apparatus for operating a network including means for regulating a power level of a signal transmitted from a communications device to a base unit, the apparatus comprising: means for determining a desired received power level of said signal transmitted from said communications device to said base unit, said desired received power level being based on a set of statistics characterizing an interference signal received at said base unit, the set of statistics comprising second or higher order statistics, means for determining a signal path gain between said communications device and said base unit, and means for regulating said power level of said signal transmitted from said communications device to said base unit as a function of said signal path gain and of said desired received power level.
Claim 33
Dependent Claim
76 words
The apparatus of claim 32 wherein the means for determining a signal path gain comprises: means for receiving, at said communications device, a pilot signal transmitted at a transmit power level from said base unit, and means for measuring, at said communications device, a received power level of said pilot signal, and means for determining said signal path gain based on said measured received power level of said pilot signal and on said transmit power level.
Claim 34
Dependent Claim
91 words
The apparatus of claim 32 wherein the means for determining a signal path gain comprises: means for receiving, at said communications device, a pilot signal transmitted from said base unit, said pilot signal comprising information about a transmit power level at which said pilot signal was transmitted from said base unit, means for measuring, at said communications device, a received power level of said pilot signal, and means for determining said signal path gain based on said transmit power level and on said measured received power level of said pilot signal.
Claim 35
Dependent Claim
20 words
The apparatus of claim 27 or 32 wherein said base unit is a base station in a cellular communications system.
Claim 36
Dependent Claim
17 words
The apparatus of claim 35 wherein said cellular communications system is a spread spectrum multiple access system.
Claim 37
Dependent Claim
22 words
The apparatus of claim 32 wherein said set of statistics comprises a variance of said interference signal received at said base unit.
Claim 38
Dependent Claim
123 words
The apparatus of claim 27 or 37 wherein said base unit is the j th base unit in a plurality of base units and wherein said desired power signal, P j , for the j th base unit at a time ( n + 1) is determined according to: where I ¯ j ( n ) is the average of said interference signal at said base unit j at time n , V ¯ j (n ) is the variance of said interference signal at said j th base unit at time n , α is a parameter related to a quality of service requirement, and v j is a function of a probability measure that said quality of service requirement is met.
Claim 39
Dependent Claim
21 words
The apparatus of claim 32 further comprising means for transmitting said signal transmitted from said communications device to said base unit.
Claim 40
Dependent Claim
165 words
In a system comprising a set of base stations, wherein each base station in said set of base stations communicates with an associated set of one or more communications devices, an apparatus for operating a system by regulating a power level of a signal transmitted from a particular communications device in the set of communications devices associated with a given base station, the apparatus comprising: means for determining a desired received power level of a signal transmitted from said particular communications device to said given base station, said desired received power level being based on a set of statistics characterizing an interference signal at said given base station, the set of statistics comprising second or higher order statistics, means for determining a signal path gain between said particular communications device and said given base station, and means for regulating said power level of said signal transmitted from said particular communications device as a function of said signal path gain and said desired received power level.
Claim 41
Dependent Claim
78 words
The apparatus of claim 40 wherein the means for determining a signal path gain comprises: means for receiving, at said particular communications device, a pilot signal transmitted at a transmit power level from said given base station, means for measuring, at said particular communications device, a received power level of said pilot signal, and means for determining said signal path gain based on said measured received power level of said pilot signal and on said transmit power level.
Claim 42
Dependent Claim
93 words
The apparatus of claim 40 wherein the means for determining a signal path gain comprises the steps of: means for receiving, at said particular communications device, a pilot signal transmitted from said given base station, said pilot signal comprising information about a transmit power level at which said pilot signal was transmitted, means for measuring, at said particular communications device, a received power level of said pilot signal, and means for determining said signal path gain based on said measured received power level of said pilot signal and on said transmit power level.
Claim 43
Dependent Claim
119 words
The apparatus of claim 40 wherein said given base station is the j th base station in said set of base stations and wherein said desired power signal, P j , for the j th base station at a time ( n + 1) is determined according to: where I ¯ j (n) is the average of said interference signal at said j th base station at time n , V ¯ j (n) is a variance of said interference signal at said j th base station at time n, α is a parameter related to a quality of service requirement, and v j is a function of a probability measure that said quality of service requirement is met.
Claim 44
Dependent Claim
23 words
The apparatus of claim 40 further comprising means for transmitting said signal transmitted from said particular communications device to said given base station.
References Cited (Backward Citations)
No citation records indexed.
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