US5715526A — Apparatus and method for controlling transmission…

Claim 1

Independent Claim 213 words

An apparatus for controlling a power of a final output signal, w o , of a base station in a cellular communications system, said base station providing communication on a plurality of channels, said base station having a transmit power tracking gain, y', and a radio frequency transmit signal, w, said apparatus comprising: a plurality of channel elements for calculating a plurality of expected powers, each of said plurality of expected powers corresponding to one of said plurality of channels; a base station transceiver system controller (BTSC) for generating a desired output power, y d , of said base station, said BTSC based on said plurality of expected powers; a transmit power detector for measuring a final transmit power of said final output signal, w o ; a radio frequency interface card (RFIC) for generating said transmit power tracking gain, y', by processing said final transmit power and said desired output power, y d , to obtain a control input, u, said RFIC comprising a transmit filter for filtering said control input, u, to obtain said transmit power tracking gain, y'; and a gain unit for processing said transmit power tracking gain, y', generated by said RFIC and said radio frequency transmit signal, w, to obtain said final output signal, w o .

Claim 2

Independent Claim 213 words

An apparatus for controlling a power of a final output signal, w o , of a base station in a cellular communications system, said base station providing communication on a plurality of channels, said base station having a transmit power tracking gain, y', and a radio frequency transmit signal, w, said apparatus comprising: a plurality of channel elements for calculating a plurality of expected powers, each of said plurality of expected powers corresponding to one of said plurality of channels; a base station transceiver system controller (BTSC) for generating a desired output power, y d , of said base station, said BTSC based on said plurality of expected powers; a transmit power detector for measuring a final transmit power of said final output signal, w o ; a radio frequency interface card (RFIC) for generating said transmit power tracking gain, y', by processing said final transmit power and said desired output power, y d , to obtain a control input, u, said RFIC comprising a transmit filter for filtering said control input, u, to obtain said transmit power tracking gain, y'; and a gain unit for processing said transmit power tracking gain, y', generated by said RFIC and said radio frequency transmit signal, w, to obtain said final output signal, w o .

Claim 3

Dependent Claim 143 words

The apparatus recited in claim 1 wherein said final output signal, w o , is comprised of plurality of signals generated by said plurality of channel elements, wherein at least one of said plurality of signals is comprised of a series of frames, each frame of which is comprised of a number of data symbols, s d , and a number of power control symbols, s pc , wherein at least one of said plurality of channels has a traffic channel gain, G t , a power control subchannel gain, G s , a traffic channel data rate, r t , and a power control sub channel data rate, r s , and wherein for each of said plurality of channel elements generating a traffic channel signal said expected power, P, is calculated by the equation: P=s.sub.d (G.sub.t.sup.2 ×r.sub.t)/(s.sub.d +s.sub.pc)+s.sub.pc (G.sub.s.sup.2 ×r.sub.s)/(s.sub.d +s.sub.pc).

Claim 4

Dependent Claim 85 words

The apparatus recited in claim 2 wherein each of said plurality of channel elements generating a traffic channel signal further comprises a first sampler for sampling from every Mth frame of said series of data frames for said corresponding traffic channel gain, G t , said corresponding power control subchannel gain, G s , said corresponding traffic channel data rate, r t , and said corresponding power control subchannel data rate, r s , to obtain a plurality of expected power samples, P m .

Claim 5

Dependent Claim 80 words

The apparatus recited in claim 3 wherein each of said plurality of channel elements further comprises a filter for filtering said plurality of expected power samples, P m , to obtain a plurality of filtered expected power samples, P m , according to the following equation: P.sub.m =ψ.sub.1 P.sub.m-1 +(1-ψ.sub.1)P.sub.m, where: ψ 1 represents a time constant; P m-1 is the previous state of said filter; and P m is the output of said filter corresponding to P m .

Claim 6

Dependent Claim 66 words

The apparatus recited in claim 4 wherein each of the plurality of channel elements further comprises a second sampler and a time stamp unit for sampling each Nth sample of said output of said filter, P m , to produce a series of sampled filtered expected powers, P k , and attaching to each of said series of sampled filtered expected powers a time stamp indication.

Claim 7

Dependent Claim 57 words

The apparatus recited in claim 5 wherein said BTSC comprises an adder for summing a plurality of said series of sampled filtered expected powers, P k , each corresponding to a different one of said plurality of channel elements and each corresponding to a common time stamp indication to obtain said desired output power, y d .

Claim 8

Dependent Claim 34 words

The apparatus recited in claim 2 wherein said RFIC comprises a first sampler for sampling said measured transmit power during every Mth frame to obtain a series of sampled measured values, y m .

Claim 9

Dependent Claim 36 words

The apparatus recited in claim 7 wherein said RFIC further comprises a first adder for subtracting a breathing attenuation value, A TX , BREATHING, from each of said series of sampled measured values, y m .

Claim 10

Dependent Claim 74 words

The apparatus recited in claim 7 wherein said RFIC further comprises a filter for filtering said series of sampled measured values, y m , to obtain a series of filtered power samples, y m , according to the following equation: y.sub.m =ψ.sub.1 y.sub.m-1 +(1-ψ.sub.1)y.sub.m, where: ψ 1 represents a time constant; y m-1 is the previous state of said filter; and y m is the output of said filter corresponding to y m .

Claim 11

Dependent Claim 62 words

The apparatus recited in claim 9 wherein said RFIC further comprises a second sampler and a time stamp unit for sampling each Nth sample of said series of filtered power samples, y m , to produce a series of sampled filtered expected powers, y k , and attaching to each of said series of sampled filtered expected powers a time stamp indication.

Claim 12

Dependent Claim 33 words

The apparatus recited in claim 10 wherein said RFIC further comprises a third comparator for subtracting the transmit power tracking gain, y', from said series of sampled filtered expected powers, y k .

Claim 13

Dependent Claim 85 words

The apparatus recited in claim 11 wherein each of said plurality of channel elements generating a traffic channel signal further comprises a first sampler for sampling from every Mth frame of said series of data frames for said corresponding traffic channel gain, G t , said corresponding power control subchannel gain, G s , said corresponding traffic channel data rate, r t , and said corresponding power control subchannel data rate, r s , to obtain a plurality of expected power samples, P m .

Claim 14

Dependent Claim 80 words

The apparatus recited in claim 12 wherein each of said plurality of channel elements further comprises a filter for filtering said plurality of expected power samples, P m , to obtain a plurality of filtered expected power samples, P m , according to the following equation: P.sub.m =ψ.sub.1 P.sub.m-1 +(1-ψ.sub.1)P.sub.m, where: ψ 1 represents a time constant; P m-1 is the previous state of said filter; and P m is the output of said filter corresponding to P m .

Claim 15

Dependent Claim 66 words

The apparatus recited in claim 13 wherein each of the plurality of channel elements further comprises a second sampler and a time stamp unit for sampling each Nth sample of said output of said filter, P m , to produce a series of sampled filtered expected powers, P k , and attaching to each of said series of sampled filtered expected powers a time stamp indication.

Claim 16

Dependent Claim 57 words

The apparatus recited in claim 14 wherein said BTSC comprises an adder for summing a plurality of said series of sampled filtered expected powers, P k , each corresponding to a different one of said plurality of channel elements and each corresponding to a common time stamp indication to obtain said desire output power, y d .

Claim 17

Dependent Claim 69 words

The apparatus recited in claim 15 wherein said RFIC further comprises a calibration adder for adding a calibration constant, A TX , LOSS, to said desired output power, y d , wherein said calibration constant, A TX , LOSS is indicative of a loss between a point where said transmit power detector measures said final transit power and an antenna for transmitting said final output signal, w o .

Claim 18

Dependent Claim 34 words

The apparatus recited in claim 16 wherein said gain unit comprises a variable gain block having a gain responsive to said transmit power tracking gain, y', and receiving said radio frequency transmit signal, w.

Claim 19

Independent Claim 126 words

The apparatus recited in claim I wherein the gain unit comprises: a second adder for adding a transmit power ability factor, P TX , ANALOG, indicating the maximum transmit power capability of said base station and the transmit power tracking gain, y' to obtain a corrected transmit power tracking gain; a third adder for adding said corrected transmit power gain and a breathing attenuation value, A TX , BREATHING, to obtain a breathing corrected transmit power gain; a variable gain block having a gain responsive to said breathing corrected transmit power gain for receiving said radio frequency transmit signal, w, and providing an amplitude controlled signal; and a high power amplifier for amplifying said amplitude controlled signal and producing said final output signal, w o .

Claim 20

Independent Claim 158 words

A method for controlling a power of a final output signal, w o , of a base station in a cellular communication system, said base station providing communication on a plurality of channels, said base station having a transmit power tracking gain, y', said method comprising the steps of: calculating a plurality of expected powers, each of said plurality of expected powers corresponding to one of said plurality of channels; summing said plurality of expected powers to generate a desired output power, y d , of said base station; measuring said power of said final output signal, w o , to obtain a measured transmit power; comparing said desired output power, y d , and said measured transmit power to obtain a control input, u; filtering said control input, u, to obtain said transmit power tracking gain, y'; and adjusting the power of said final output signal, w o , according to said transmit power tracking gain, y'.

Claim 21

Independent Claim 158 words

A method for controlling a power of a final output signal, w o , of a base station in a cellular communication system, said base station providing communication on a plurality of channels, said base station having a transmit power tracking gain, y', said method comprising the steps of: calculating a plurality of expected powers, each of said plurality of expected powers corresponding to one of said plurality of channels; summing said plurality of expected powers to generate a desired output power, y d , of said base station; measuring said power of said final output signal, w o , to obtain a measured transmit power; comparing said desired output power, y d , and said measured transmit power to obtain a control input, u; filtering said control input, u, to obtain said transmit power tracking gain, y'; and adjusting the power of said final output signal, w o , according to said transmit power tracking gain, y'.

Claim 22

Dependent Claim 134 words

The method recited in claim 19 wherein said final output signal, w o , is comprised of a plurality of signals, wherein at least one of said plurality of signals is comprised of a series of frames, each frame of which is comprised of a number of data symbols, s d , and a number of power control symbols, s pc , wherein at least one of said plurality of channels has a traffic gain, G t , a power control subchannel gain, G s , a traffic data rate, r t , and a power control subchannel data rate, r s , and wherein for each of said plurality of channels corresponding to a traffic channel signal said expected power, P, is calculated by the equation: P=s.sub.d (G.sub.t.sup.2 ×r.sub.t)/(s.sub.d +s.sub.pc)+s.sub.pc (G.sub.s.sup.2 ×r.sub.s)/(s.sub.d +s.sub.pc).

Claim 23

Dependent Claim 73 words

The method recited in claim 20 further comprising the step of sampling from every Mth frame of said series of data frames for said corresponding traffic channel gain, G t , said corresponding power control sub channel gain, G s , said corresponding traffic channel data rate, r t , and said corresponding power control subchannel data rate, r s , and calculating a corresponding plurality of expected power samples, P m .

Claim 24

Dependent Claim 76 words

The method recited in claim 21 further comprises the step of filtering said plurality of expected power samples, P m , to obtain a plurality of filtered expected power samples, P m , according to the following equation: P.sub.m =ψ.sub.1 P.sub.m-1 +(1-ψ.sub.1)P.sub.m, where: ψ 1 represents a time constant; P m-1 is the previous result of said step of filtering; and P m is the result of said step of filtering corresponding to P m .

Claim 25

Dependent Claim 57 words

The method recited in claim 22 further comprising the steps of: sampling each Nth one of said plurality of filtered expected power samples, P m , to produce a series of sampled filtered expected powers, P k ; and attaching to each of said series of sampled filtered expected powers, P k , a time stamp indication.

Claim 26

Dependent Claim 54 words

The method recited in claim 23 further comprising the steps of summing a plurality of said series of sampled filtered expected powers, P k , each corresponding to a different one of said traffic channel signals and each corresponding to a common time stamp indication to obtain said desired output power, y d .

Claim 27

Dependent Claim 31 words

The method recited in claim 20 further comprising the step of sampling said measured transmit power during every Mth frame to obtain a series of sampled measured values, y m .

Claim 28

Dependent Claim 32 words

The method recited in claim 25 further comprising the step of subtracting a breathing attenuation value, A TX , BREATHING, from each of said series of sampled measured values, y m .

Claim 29

Dependent Claim 73 words

The method recited in claim 25 wherein said RFIC further comprising the step of filtering said series of sampled measured values, y m to obtain a series of filtered power samples, y m , according to the following equation: y.sub.m =ψ.sub.1 y.sub.m-1 +(1-ψ.sub.1)y.sub.m, where: ψ 1 represents a time constant; y m-1 is the previous state of said filter; and y m is the output of said filter corresponding to y m .

Claim 30

Dependent Claim 53 words

The method recited in claim 27 further comprising the step of: sampling each Nth output of said series of filtered power samples, y m , to produce a series of sampled filtered expected bowers, y k ; and attaching to each of said series of sampled filtered expected powers a time stamp indication.

Claim 31

Dependent Claim 29 words

The method recited in claim 28 further comprising the step of subtracting the transmit power tracking gain, y', from said series of sampled filtered expected powers, y k .

Claim 32

Dependent Claim 72 words

The method recited in claim 29 further comprising the step of sampling from every Mth frame of said series of data frames for said corresponding traffic channel gain, G t , said corresponding power control subchannel gain, G s , said corresponding traffic channel data rate, r t , and said corresponding power control subchannel data rate, r s , and calculating a corresponding plurality of expected power samples, P m .

Claim 33

Dependent Claim 76 words

The method recited in claim 30 further comprises the step of filtering said plurality of expected power samples, P m , to obtain a plurality of filtered expected power samples, P m , according to the following equation: P.sub.m =ψ.sub.1 P.sub.m-1 +(1-ψ.sub.1)P.sub.m, where: ψ 1 represents a time constant; P m-1 is the previous result of said step of filtering; and P m is the result of said step of filtering corresponding to P m .

Claim 34

Dependent Claim 57 words

The method recited in claim 31 further comprising the steps of: sampling each Nth one of said plurality of filtered expected power samples, P m , to produce a series of sampled filtered expected powers, P k ; and attaching to each of said series of sampled filtered expected powers, P k , a time stamp indication.

Claim 35

Dependent Claim 54 words

The method recited in claim 32 further comprising the steps of summing a plurality of said series of sampled filtered expected powers, P k , each corresponding to a different one of said traffic channel signals and each corresponding to a common time stamp indication to obtain said desired output power, y d .

Claim 36

Dependent Claim 62 words

The method recited in claim 33 further comprising the step of adding a calibration constant, A TX , LOSS, to said desired output power, y d , wherein said calibration constant, A TX , LOSS is indicative of a loss between a point where said final transit power is measured and an antenna for transmitting said final output signal, w o .

Claim 37

Dependent Claim 70 words

The method recited in claim 19 further comprising the steps of: adding an transmit power ability factor, P TX , ANALOG, indicating the maximum transmit power capability of said base station and the transmit power tracking gain, y' to obtain a corrected transmit power tracking gain; and adding said corrected transmit power gain and a breathing attenuation value, A TX , BREATHING, to obtain a breathing corrected transmit power gain.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2001-02-02	2001-08-04	2002-02-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2005-02-02	2005-08-04	2006-02-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2009-02-02	2009-08-04	2010-02-03	$7700.00	Window Closed / Lapsed

Apparatus and method for controlling transmission power in a cellular communications system

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag