Patent EP0565505A2 successfully refreshed from Google Patents.
EP0565505A2
Expired / Lapsed
EP
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Duplex power control in a cellular mobile radio telephone system
Assignee: Ericsson Inc
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Filing: 1993-04-01
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Granted: —
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Expires: 2013-04-01
Abstract
Abstract Measurements of mobile signal strength received at the base station are used to determine the portion of power that should be transmitted by the base station to a particular mobile. Each of a plurality of mobiles measure the relative strength of the base station signal specifically intended for that mobile. The relative strength is compared to either the total base station signal power or to a cumulative ranking of the power of signals intended for other mobiles. That comparison is used to determine whether the mobile should increase or decrease its power.
Inventors
- 👤 Paul W. Dent
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 16:10
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/34; H04W52/346; H04W52/38; H04W52/44
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
166 words
A power regulation system, comprising: a plurality of mobiles for communicating with at least one base station, each mobile including: mobile receiving means for receiving a composite signal formed from signals transmitted from said base station to all of said plurality of mobiles, each transmitted signal intended for one of said mobiles, and for determining corresponding signal strength values for each received signal in said composite signal and, means, connected to said mobile receiving means, for computing from said signal strength values a desired mobile transmitter power level, and said base station including: base station receiving means for receiving signals transmitted from said plurality of mobiles and for measuring their corresponding signal strength values, and means for modifying power levels of signal transmissions to said mobiles based on said measured signal strength values so that each of said mobile receiving means receives its intended signal with substantially equal signal quality and said base station receiving means receives said mobile transmitted signals with substantially equal signal quality.
Claim 2
Dependent Claim
166 words
A power regulation system, comprising: a plurality of mobiles for communicating with at least one base station, each mobile including: mobile receiving means for receiving a composite signal formed from signals transmitted from said base station to all of said plurality of mobiles, each transmitted signal intended for one of said mobiles, and for determining corresponding signal strength values for each received signal in said composite signal and, means, connected to said mobile receiving means, for computing from said signal strength values a desired mobile transmitter power level, and said base station including: base station receiving means for receiving signals transmitted from said plurality of mobiles and for measuring their corresponding signal strength values, and means for modifying power levels of signal transmissions to said mobiles based on said measured signal strength values so that each of said mobile receiving means receives its intended signal with substantially equal signal quality and said base station receiving means receives said mobile transmitted signals with substantially equal signal quality.
Claim 3
Dependent Claim
36 words
A system as described in claim 1, wherein said computing means computes said desired power level for each mobile transmitter from a relative ranking of said determined signal strength values from greatest to weakest signal strength.
Claim 4
Dependent Claim
62 words
The system according to claim 2, wherein said computing means includes: means for detecting changes in a power level of transmissions intended for said mobile based on changes in said relative ranking; means for increasing said mobile's transmitted signal power level when said relative ranking increases; and means for decreasing said mobile's transmitted signal power level when said mobile's relative ranking decreases.
Claim 5
Dependent Claim
51 words
A system as described in claim 1, wherein said computing means computes said desired power level for its respective mobile as a function of a ratio of said determined signal strength value associated with said respective mobile to a mean of said determined signal strength values associated with said other mobiles.
Claim 6
Dependent Claim
58 words
A system according to claim 4, wherein said computing means includes: means for detecting changes in power levels of transmitted signals intended for said mobile based on changes in said ratio; means for increasing said mobile's transmitted signal power level when said ratio increases; and means for decreasing said mobile's transmitted signal power level when said ratio decreases.
Claim 7
Dependent Claim
36 words
A system according to claim 1, wherein said computing means includes: means for storing in table form a non-linear power distribution function, and means for determining said power level based on said non-linear power distribution function.
Claim 8
Dependent Claim
25 words
A system according to claim 6, wherein said base station includes: means for altering said storing means in each mobile to adapt said non-linear function.
Claim 9
Dependent Claim
44 words
A system according to claim 1, each mobile further comprising: transmission means for transmitting a mobile signal from said mobile, and means, connected to said computing means, for gradually altering power of said transmission means based on said computed desired mobile transmitter power level.
Claim 10
Dependent Claim
38 words
A system according to claim 1, wherein said modifying means increases power levels of signal transmissions to mobiles having relatively lesser measured signal strength values and decreases power levels to mobiles having relatively greater measured signal strength values.
Claim 11
Dependent Claim
63 words
A system as in claim 1, wherein said computing means includes: means for sorting said determined signal strength values in an order from greatest to lowest signal strength value, and means for selecting said desired mobile transmitter power level from a predetermined look-up table stored in a memory based on the position of said mobile's determined signal strength value in said sorted order.
Claim 12
Dependent Claim
22 words
A system as in claim 1, wherein said mobile and base station receiving means each include a Code Division Multiple Access receiver.
Claim 13
Dependent Claim
86 words
A system as described in claim 1, wherein said signal strength determining means is a code division multiple access demodulator (CDMA) including: subtractive CDMA demodulation means for demodulating said composite signal into a plurality of demodulated signals corresponding to said transmitted signals to each of said plurality of mobiles; signal strength ranking means for ranking said demodulated signals in an order from greatest to weakest signal strength; and wherein said CDMA demodulation means demodulates and subtracts said demodulated signals from said composite signal in said order.
Claim 14
Dependent Claim
22 words
The system according to claim 12, wherein said ranking means includes a memory for storing said demodulated signal strengths in table format.
Claim 15
Dependent Claim
37 words
The system according to claim 12, each mobile further comprising: CDMA signal generating means, connected to said computing means, for generating coded blocks of CDMA data signals and for staggering in time transmission of said coded blocks.
Claim 16
Dependent Claim
39 words
The power control system according to claim 1, wherein each mobile includes: means for detecting periods of silence in communications from said base station to any mobile, and means for deactivating demodulation of a signal detected to be silent.
Claim 17
Dependent Claim
44 words
A power control system, comprising: at least one base station for controlling a plurality of mobiles each having a transmitter, said base station having means for altering the proportion of total base transmitter power transmitted to each mobile to regulate each mobile's transmitter power.
Claim 18
Dependent Claim
44 words
A power control system, comprising: at least one base station for controlling a plurality of mobiles each having a transmitter, said base station having means for altering the proportion of total base transmitter power transmitted to each mobile to regulate each mobile's transmitter power.
Claim 19
Dependent Claim
30 words
The power control system according to claim 16, wherein said altering means includes means for equalizing mobile transmitter power levels received at said base station from each of said mobiles.
Claim 20
Dependent Claim
42 words
The power control system according to claim 16, each mobile further comprising: means for detecting alterations in the proportion of total base station transmitter power transmitted to said mobile, and means for changing said mobile transmitter power based on said detected alterations.
Claim 21
Dependent Claim
48 words
The power control system as in claim 18, wherein said changing means changes said mobile transmitter power as a function of a ratio of a strength value of a signal intended for said mobile to a mean of strength values of signals intended for other of said mobiles.
Claim 22
Dependent Claim
56 words
The power control system as in claim 18, wherein said detecting means includes means for ranking from greatest to least signal strength values of all signals transmitted to said mobiles and wherein said changing means increases said mobile transmitter power if its relative ranking increases and decreases said mobile transmitter power if its relative ranking decreases.
Claim 23
Dependent Claim
35 words
A system according to claim 18, said changing means including: means for storing in table form a non-linear power distribution function, and means for determining said changed mobile transmitter power based on said non-linear function.
Claim 24
Dependent Claim
25 words
A system according to claim 21, wherein said base station includes means for modifying said storing means in each mobile to adapt said non-linear function.
Claim 25
Dependent Claim
45 words
The power control system according to claim 16, wherein each mobile includes: a receiver; means for detecting periods of silence in communications from said base station to any mobile; and means for deactivating said processing by said receiver of any signal detected to be silent.
Claim 26
Dependent Claim
54 words
The power control system according to claim 16, further comprising: means for achieving approximately the same signal-to-interference ratios at said base station for all of said mobiles, and means for regulating the power of signal transmissions from said base station to achieve approximately the same signal-to-interference ratios at each mobile from said base station.
Claim 27
Dependent Claim
90 words
A power control system having at least one base station for controlling a plurality of mobiles, comprising: means for regulating the power levels of signal transmissions from said base station to achieve approximately the same signal-to -interference ratios at each mobile from said base station, and means responsive to the power levels of signal transmissions from said base station for adjusting the power level of signals transmitted from said mobiles to said base station to achieve approximately the same signal-to-interference ratios at said base station for all of said mobiles.
Claim 28
Dependent Claim
90 words
A power control system having at least one base station for controlling a plurality of mobiles, comprising: means for regulating the power levels of signal transmissions from said base station to achieve approximately the same signal-to -interference ratios at each mobile from said base station, and means responsive to the power levels of signal transmissions from said base station for adjusting the power level of signals transmitted from said mobiles to said base station to achieve approximately the same signal-to-interference ratios at said base station for all of said mobiles.
Claim 29
Dependent Claim
45 words
The power control system according to claim 25, wherein each mobile includes: a receiver; means for detecting periods of silence in communications from said base station to any mobile; and means for deactivating processing by said mobile receiver of any signal detected to be silent.
Claim 30
Dependent Claim
57 words
A system as described in claim 25, each mobile further comprising: means for ranking, in order of relative signal strength from greatest to weakest signal strength, signals transmitted from said base station intended for each mobile, wherein said adjusting means adjusts the power level of signal transmissions from each mobile based on said relative signal strength ranking.
Claim 31
Dependent Claim
41 words
A system according to claim 27, each mobile further comprising: transmission means for transmitting a mobile signal from said mobile, wherein said adjusting means, connected to said ranking means, gradually adjusts power of each mobile's transmitter based on said relative ranking.
Claim 32
Dependent Claim
56 words
A system according to claim 27, wherein said adjusting means increases the power level of signal transmissions from mobiles that determine its respective signal strength received from the base station to have increased, and decreases power settings of signal transmissions from mobiles that determine its respective signal strength received from said base station to have decreased.
Claim 33
Dependent Claim
56 words
A system as in claim 27, wherein said ranking means includes: means for sorting said signal strength values in an order from greatest to lowest, and means for selecting mobile transmission power levels from a predetermined look-up table stored in a memory based on the position of a mobile's signal strength value in said sorted order.
Claim 34
Dependent Claim
40 words
A system as described in claim 25, further comprising: means for computing a power level for each mobile as a function of a ratio of each mobile's signal strength value to a mean of said other mobile's signal strength values.
Claim 35
Dependent Claim
36 words
A system as described in claim 25, wherein each mobile includes: means for storing in table form a non-linear power distribution function, and means for determining the adjusted mobile transmitter power based on said non-linear function.
Claim 36
Dependent Claim
26 words
A system as described in claim 32, wherein said base station includes means for modifying said storing means in each mobile to adapt said non-linear function.
References Cited (Backward Citations)
No citation records indexed.
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