US6449462B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for quality-based power control in cellular communications systems
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1998-02-27
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Granted: 2002-09-10
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Expires: 2018-02-27
Abstract
Abstract A method and system for quality-based transmission power control in a cellular communications system are disclosed, whereby a network operator can specify the transmission quality requirements using a measurement that better reflects the actual quality perceived by the users. All transmitter power levels in the network can be controlled by identical power regulators, each of which can adapt to individual traffic situations in order to achieve the specified quality. For example, in a GSM frequency-hopping network, the FER together with the parameters estimated from the current traffic situation, are mapped onto a target C/I, which in turn, the power control algorithm strives to achieve. Consequently, the power regulators can adapt to the traffic situation experienced by each receiver.
Inventors
- 👤 Fredrik Gunnarsson
- 👤 Jonas Blom
- 👤 Fredrik Gustafsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:39
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/18; H04W52/24; H04W52/248; H04W52/22; H04W52/223; H04W52/06
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
108 words
A method for performing quality-based power control in a mobile communications system, comprising the steps of: estimating an interference distribution and a path loss from system measurement information; computing both a carrier and a carrier-to-interference ratio from said estimated interference distribution and from said estimated path loss; determining a target carrier-to-interference ratio based on each of a predefined quality goal that is desired for the system, said computed carrier, said estimated interference distribution, and said estimated path loss, said predefined quality goal comprising a quality goal other than a carrier-to-interference ratio; and assigning transmitter power levels such that said computed carrier-to-interference ratio substantially tracks said target carrier-to-interference ratio.
Claim 2
Independent Claim
108 words
A method for performing quality-based power control in a mobile communications system, comprising the steps of: estimating an interference distribution and a path loss from system measurement information; computing both a carrier and a carrier-to-interference ratio from said estimated interference distribution and from said estimated path loss; determining a target carrier-to-interference ratio based on each of a predefined quality goal that is desired for the system, said computed carrier, said estimated interference distribution, and said estimated path loss, said predefined quality goal comprising a quality goal other than a carrier-to-interference ratio; and assigning transmitter power levels such that said computed carrier-to-interference ratio substantially tracks said target carrier-to-interference ratio.
Claim 3
Dependent Claim
16 words
The method of claim 1 , wherein said system measurement information comprises RSSI and QI information.
Claim 4
Dependent Claim
43 words
The method of claim 1 , wherein said estimating step comprises estimating a mean and a standard deviation for said interference distribution, and wherein said determining step comprises mapping said estimated standard deviation and said predefined quality goal onto said target carrier-to-interference ratio.
Claim 5
Dependent Claim
14 words
The method of claim 3 , wherein the mobile communications system comprises a GSM.
Claim 6
Dependent Claim
16 words
The method of claim 3 , wherein the mobile communications system comprises a random frequency-hopping system.
Claim 7
Dependent Claim
17 words
The method of claim 1 , wherein the estimating step is performed with a maximum likelihood estimator.
Claim 8
Dependent Claim
16 words
The method of claim 1 , wherein said predefined quality goal comprises a Frame Erasure Rate.
Claim 9
Dependent Claim
24 words
The method of claim 1 , wherein the assigning step further comprises the step of applying anti-reset windup to reduce effects of physical constraints.
Claim 10
Independent Claim
118 words
A method for estimating a carrier-to-interference ratio for quality-based power control in a mobile communications system, comprising the steps of: inputting a sequence of measurement reports indicative of signal measurements that have been made in the system; updating a likelihood function with measurement report information from at least one measurement report of said sequence of measurement reports; computing a plurality of values for an estimated mean value of an interference, an estimated standard deviation value of said interference, and an estimated path loss, said interference and said path loss derived from the updating step; and deriving the estimated carrier-to-signal interference ratio using a transmission power value, said estimated mean value of said interference, and said estimated path loss.
Claim 11
Independent Claim
118 words
A method for estimating a carrier-to-interference ratio for quality-based power control in a mobile communications system, comprising the steps of: inputting a sequence of measurement reports indicative of signal measurements that have been made in the system; updating a likelihood function with measurement report information from at least one measurement report of said sequence of measurement reports; computing a plurality of values for an estimated mean value of an interference, an estimated standard deviation value of said interference, and an estimated path loss, said interference and said path loss derived from the updating step; and deriving the estimated carrier-to-signal interference ratio using a transmission power value, said estimated mean value of said interference, and said estimated path loss.
Claim 12
Dependent Claim
16 words
The method of claim 9 , further comprising the step of smoothing said plurality of values.
Claim 13
Independent Claim
70 words
A method for computing a target carrier-to-interference ratio for controlling transmission power in a mobile communications system, comprising the steps of: inputting a plurality of values for an estimated mean value of an interference, an estimated standard deviation value of said interference, and an estimated path loss; and determining a target carrier-to-interference ratio based on a predefined quality goal that is desired for the system, and said plurality of values.
Claim 14
Independent Claim
70 words
A method for computing a target carrier-to-interference ratio for controlling transmission power in a mobile communications system, comprising the steps of: inputting a plurality of values for an estimated mean value of an interference, an estimated standard deviation value of said interference, and an estimated path loss; and determining a target carrier-to-interference ratio based on a predefined quality goal that is desired for the system, and said plurality of values.
Claim 15
Dependent Claim
16 words
The method of claim 11 , wherein the determining step is performed using a look-up table.
Claim 16
Dependent Claim
40 words
The method of claim 11 , wherein the transmission power is controlled by: computing a carrier-to-interference ratio from said plurality of values; and assigning transmitter power levels such that said computed carrier-to-interference ratio tracks substantially with said target carrier-to-interference ratio.
Claim 17
Dependent Claim
16 words
The method of claim 13 , wherein the transmission power is controlled by a PID controller.
Claim 18
Dependent Claim
15 words
The method of claim 13 , wherein the transmission power is controlled by an MDBA.
Claim 19
Dependent Claim
19 words
The method of claim 13 , further comprising the step of applying anti-reset windup to said transmitter power levels.
Claim 20
Independent Claim
58 words
A method for performing quality-based power control in a mobile communications system, comprising the steps of: inputting at least one interference distribution characteristic and a signal gain characteristic; and determining a target carrier-to-interference ratio based on a predefined quality goal that is desired for the system, said at least one interference distribution characteristic and said signal gain characteristic.
Claim 21
Independent Claim
58 words
A method for performing quality-based power control in a mobile communications system, comprising the steps of: inputting at least one interference distribution characteristic and a signal gain characteristic; and determining a target carrier-to-interference ratio based on a predefined quality goal that is desired for the system, said at least one interference distribution characteristic and said signal gain characteristic.
Claim 22
Dependent Claim
43 words
The method of claim 17 , further comprising the steps of: inputting a transmission power value; and mapping said transmission power value, said predefined quality goal, said at least one interference distribution characteristic and said signal gain characteristic onto said target carrier-to-interference ratio.
Claim 23
Independent Claim
69 words
A method for performing quality-based power control in a mobile communications network, comprising the steps of: inputting network quality information indicative of a quality condition existing in the network; inputting a predefined quality goal that is desired for the network; estimating a path loss from system measurement information; and outputting a target carrier-to-interference ratio based on said network quality information, said estimated path loss, and said predefined quality goal.
Claim 24
Independent Claim
69 words
A method for performing quality-based power control in a mobile communications network, comprising the steps of: inputting network quality information indicative of a quality condition existing in the network; inputting a predefined quality goal that is desired for the network; estimating a path loss from system measurement information; and outputting a target carrier-to-interference ratio based on said network quality information, said estimated path loss, and said predefined quality goal.
Claim 25
Independent Claim
92 words
A method for performing quality-based power control in a mobile communications system, comprising the steps of: identifying at least one time delay; determining if there are physical constraints involved in performing the quality-based power control; if there are physical constraints involved in performing the quality-based power control, utilize at least one describing function to predict limits for oscillations in a local loop; and if there are no physical constraints involved in performing the quality-based power control, determine locations of local loop poles that keep a power controller operating within a stability region.
Claim 26
Independent Claim
92 words
A method for performing quality-based power control in a mobile communications system, comprising the steps of: identifying at least one time delay; determining if there are physical constraints involved in performing the quality-based power control; if there are physical constraints involved in performing the quality-based power control, utilize at least one describing function to predict limits for oscillations in a local loop; and if there are no physical constraints involved in performing the quality-based power control, determine locations of local loop poles that keep a power controller operating within a stability region.
Claim 27
Dependent Claim
17 words
The method of claim 20 , wherein said at least one time delay is equal to zero.
Claim 28
Dependent Claim
21 words
The method of claim 20 , wherein said at least one describing function comprises at least one discrete time describing function.
Claim 29
Dependent Claim
23 words
The method of claim 20 , wherein it is determined that a set of controller parameters imply that said power controller is stable.
Claim 30
Dependent Claim
15 words
The method of claim 20 , wherein said limits comprise limits on power controller parameters.
Claim 31
Independent Claim
139 words
A system for performing quality-based power control in a mobile communications system, comprising: at least one base station system; a plurality of mobile stations; and a power regulator associated with said at least one base station system and said plurality of mobile stations, said power regulator operable to: estimate an interference distribution and a path loss from network measurement information; compute both a carrier and a carrier-to-interference ratio from said estimated interference distribution and said estimated path loss; determine a target carrier-to-interference ratio based on each of a predefined quality goal that is desired for the system, said computed carrier, said estimated interference distribution, and said estimated path loss, said predefined quality goal comprising a quality goal other than a carrier-to-interference ratio; and assign transmitter power levels such that said computed carrier-to-interference ratio substantially tracks said target carrier-to-interference ratio.
Claim 32
Independent Claim
139 words
A system for performing quality-based power control in a mobile communications system, comprising: at least one base station system; a plurality of mobile stations; and a power regulator associated with said at least one base station system and said plurality of mobile stations, said power regulator operable to: estimate an interference distribution and a path loss from network measurement information; compute both a carrier and a carrier-to-interference ratio from said estimated interference distribution and said estimated path loss; determine a target carrier-to-interference ratio based on each of a predefined quality goal that is desired for the system, said computed carrier, said estimated interference distribution, and said estimated path loss, said predefined quality goal comprising a quality goal other than a carrier-to-interference ratio; and assign transmitter power levels such that said computed carrier-to-interference ratio substantially tracks said target carrier-to-interference ratio.
Claim 33
Dependent Claim
14 words
The system of claim 25 , wherein the mobile communications system comprises a GSM.
Claim 34
Dependent Claim
16 words
The system of claim 25 , wherein the mobile communications system comprises a random frequency-hopping system.
Claim 35
Dependent Claim
19 words
The system of claim 25 , wherein said power controller is operable to estimate with a maximum likelihood estimator.
Claim 36
Dependent Claim
16 words
The system of claim 25 , wherein said predefined quality goal comprises a Frame Erasure Rate.
Claim 37
Dependent Claim
28 words
The system of claim 25 , wherein said power controller is further operable to assign transmitter power levels by applying anti-reset windup to reduce effects of physical constraints.
Claim 38
Independent Claim
119 words
A system for performing quality-based power control in a mobile communications system, comprising: at least one base station system; a plurality of mobile stations; and a power regulator associated with said at least one base station system and said plurality of mobile stations, said power regulator operable to: compute a carrier-to-interference ratio from measurement information; estimate a path loss from system measurement information; determine a target carrier-to-interference ratio based on a predefined quality goal that is desired for the system, said estimated path loss, and said computed carrier-to-interference ratio, said predefined quality goal comprising a quality goal other than a carrier-to-interference ratio; and assign transmitter power levels such that said computed carrier-to-interference ratio substantially tracks said target carrier-to-interference ratio.
Claim 39
Independent Claim
119 words
A system for performing quality-based power control in a mobile communications system, comprising: at least one base station system; a plurality of mobile stations; and a power regulator associated with said at least one base station system and said plurality of mobile stations, said power regulator operable to: compute a carrier-to-interference ratio from measurement information; estimate a path loss from system measurement information; determine a target carrier-to-interference ratio based on a predefined quality goal that is desired for the system, said estimated path loss, and said computed carrier-to-interference ratio, said predefined quality goal comprising a quality goal other than a carrier-to-interference ratio; and assign transmitter power levels such that said computed carrier-to-interference ratio substantially tracks said target carrier-to-interference ratio.
Claim 40
Dependent Claim
19 words
The method of claim 11 , wherein the quality goal is a quality condition other than a carrier-to-interference ratio.
Claim 41
Dependent Claim
19 words
The method of claim 17 , wherein the quality goal is a quality condition other than a carrier-to-interference ratio.
Claim 42
Dependent Claim
19 words
The method of claim 19 , wherein the quality goal is a quality condition other than a carrier-to-interference ratio.
References Cited (Backward Citations)
US4910794A
Cited
US5270916A
Cited
US5386589A
Cited
US5216692A
Cited
US5448751A
Cited
US5574982A
Cited
US5412686A
Cited
US5623484A
Cited
US5551057A
Cited
US5873028A
Cited
EP0709973A1
Cited
EP0741467A2
Cited
US5732328A
Cited
US5878328A
Cited
US5852782A
Cited
US5732334A
Cited
US5838269A
Cited
US6021125A
Cited
US6131013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-09-09 | 2006-03-11 | 2006-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-09 | 2010-03-11 | 2010-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-09 | 2014-03-11 | 2014-09-10 | $7700.00 | Window Closed / Lapsed |