WO2002009311A2 - Fast adaptive power control for a variable multirate communications system - Google Patents

Fast adaptive power control for a variable multirate communications system Download PDF

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Publication number
WO2002009311A2
WO2002009311A2 PCT/US2001/021979 US0121979W WO0209311A2 WO 2002009311 A2 WO2002009311 A2 WO 2002009311A2 US 0121979 W US0121979 W US 0121979W WO 0209311 A2 WO0209311 A2 WO 0209311A2
Authority
WO
WIPO (PCT)
Prior art keywords
data
rate
signal
transmission
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2001/021979
Other languages
English (en)
French (fr)
Other versions
WO2002009311A3 (en
Inventor
John W. Haim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Technology Corp
Original Assignee
InterDigital Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP01952673A priority Critical patent/EP1305894B1/en
Priority to BR0113022-6A priority patent/BR0113022A/pt
Priority to MXPA03000739A priority patent/MXPA03000739A/es
Priority to KR1020127010475A priority patent/KR101325382B1/ko
Priority to KR1020087004058A priority patent/KR100926810B1/ko
Priority to AU2001273402A priority patent/AU2001273402A1/en
Priority to JP2002514914A priority patent/JP4684530B2/ja
Priority to KR1020087025468A priority patent/KR100966315B1/ko
Priority to KR1020117020620A priority patent/KR101267748B1/ko
Priority to IL15407401A priority patent/IL154074A0/xx
Priority to HK04102899.4A priority patent/HK1060220B/xx
Priority to KR1020037014715A priority patent/KR100759296B1/ko
Priority to KR1020097024224A priority patent/KR20100003300A/ko
Priority to KR1020127027526A priority patent/KR101325309B1/ko
Priority to KR1020037001152A priority patent/KR100842239B1/ko
Application filed by InterDigital Technology Corp filed Critical InterDigital Technology Corp
Priority to KR1020097009356A priority patent/KR20090071626A/ko
Priority to KR1020107013301A priority patent/KR101163312B1/ko
Priority to DE60122740T priority patent/DE60122740T2/de
Priority to DE0001305894T priority patent/DE01952673T1/de
Priority to CNB018162827A priority patent/CN1223112C/zh
Priority to CA002417242A priority patent/CA2417242C/en
Priority to KR1020107029907A priority patent/KR101184483B1/ko
Publication of WO2002009311A2 publication Critical patent/WO2002009311A2/en
Publication of WO2002009311A3 publication Critical patent/WO2002009311A3/en
Priority to NO20030333A priority patent/NO328536B1/no
Anticipated expiration legal-status Critical
Priority to IL193218A priority patent/IL193218A/en
Priority to IL200334A priority patent/IL200334A/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
    • H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/10—Open loop power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters

Definitions

  • the present invention relates to power control for wireless
  • transmitter power is varied by applying
  • FDD Freplex
  • FIGs 3 and 4 represent prior art open and closed power control transmission systems, respectively. Background specification data for such systems
  • the invention provides a method of controlling transmitter power in a
  • the transmitter power is determined as a function of
  • transmission data signal is compensated for in advance of a quality of data based
  • the method is applicable in either an open or closed power control
  • the invention in a transmitter of either an open or closed system, preferably
  • V " (N(t)/M(t)) is applied to the scale factor.
  • the method is applicable to an open loop power control system where
  • the transmitter receives a reference signal, reference signal power data, measured
  • the data is based on relatively slowly collected received signal quality data.
  • transmitter measures the reference signal to determine received reference signal power
  • the transmitter then computes the scale factor
  • the method is also applicable to a closed loop system where the
  • transmitter utilizes step up/down data generated by the receiver and computes the scale
  • the step is a factor based on the step up/step down data and V " (N(t)/M(t)).
  • the step is a factor based on the step up/step down data and V " (N(t)/M(t)).
  • up/down data is generated by the receiver by combining measured interference power
  • the target SIR data is preferably computed by multiplying a nominal target SIR data based on relatively slowly collected received signal quality data by a factor
  • the invention also provides a transmitter for a wireless communication
  • the transmitter transmission power is
  • the transmitter based on quality of data received by a receiver of the transmitted data.
  • the data signal rate converter is associated with the processor such that
  • the processor computes the transmission power scale factor as a function of N(t)/M(t)
  • the data signal rate converter converts the user data signal
  • the transmitter is configurable as part of an open loop power control
  • reference signal reference signal
  • reference signal power data measured interference power data
  • SIR target signal to interference ratio
  • the transmitter includes a signal
  • measuring device which measures received reference signal power and path loss
  • processing circuitry for computing a path loss based on the received reference signal
  • processor computes the transmission power scale factor based on the computed path
  • the transmitter is also configurable as part of a closed loop power
  • control system where the transmitter receives step up/down data from the receiver of
  • the transmitter processor computes the transmission
  • the invention also provides a closed loop transmission power control
  • the system includes a receiver which receives the M(t) rate
  • the receiver preferably has a data signal rate converter which decreases the data rate of received transmission
  • measuring device for measuring the quality of data of the user data signal, and circuitry
  • the data signal rate converter is associated with the circuitry to
  • the system also preferably includes a transmitter having a data signal
  • rate convertor which converts the user data signal having rate N(t) into the
  • the receiver has an interference measuring
  • the data quality measuring device outputs a nominal target
  • circuitry computes the step up/down data by combining measured interference power
  • Figure 1 is a schematic diagram of a conventional open loop power
  • Figure 2 is a schematic diagram of a conventional closed loop power
  • Figure 3 is a schematic diagram of a conventional open loop power
  • control system for variable multirate data wireless communication.
  • Figure 4 is a schematic diagram of a conventional closed loop power
  • control system for variable multirate data wireless communication.
  • Figure 5 is a block diagram of data rate up-conversion from 6 to 8 bits
  • Figure 6 is a block diagram of data rate down-conversion of repeated
  • Figure 7 is a schematic diagram of a fast adaptive open loop power
  • control system for variable multirate data wireless communication made in accordance with
  • Figure 8 is a schematic diagram of a fast adaptive closed loop power
  • control system for variable multirate data wireless communication made in accordance with
  • the power control system is referred to as
  • outer loops of both types of systems are closed loops.
  • Both stations 10, 30 are transceivers. Typically one is a base
  • the transmitting station 10 includes a transmitter 11 having a data line
  • the user data signal is
  • the user data is transmitted from an antenna system 14 of the transmitter 11.
  • a wireless radio signal 20 containing the transmitted data is received by
  • the receiving station 30 via a receiving antenna system 31.
  • the system will also receive interfering radio signals 21 which impact on the quality of the received data.
  • the receiving station 30 includes an interference power measuring
  • the receiving station 30 also includes a data quality
  • the data quality measuring device 34 is coupled with
  • a processing device 36 which receives the signal quality data and computes target
  • SIR signal to interference ratio
  • the receiving station 30 also includes a transmitter 38 which is coupled
  • the receiving station's transmitter 38 also includes inputs 40, 41 , 42 for
  • a reference signal transmit power data, respectively.
  • the receiving station 30 transmits its user data and the control related data and
  • the transmitting station 10 includes a receiver 16 and an associated
  • the transmitting station's receiver 16 receives the radio
  • the transmitting station processor 15 is associated with the transmitting
  • transmitter 11 also includes a device 18 for measuring received reference signal power
  • path loss signal is generated by the path loss computing circuitry 19 from data received
  • the reference signal measuring device 18 is coupled
  • circuitry 19 preferably determines the path loss based upon the difference between the
  • the "inner" loop is the
  • Typical metrics for digital data quality are bit error rate
  • the updated target SIR is that value (in theory) which applied in
  • the transmitter inner loop would cause the measured metric to converge to the desired
  • the update rate of target SIR is bounded by the time required to accumulate
  • the transmitting station 50 includes a transmitter 51 having a data line
  • the user data signal is
  • a wireless radio signal 60 containing the transmitted data is received by
  • the receiving station 70 via a receiving antenna system 71.
  • the receiving station 70 includes an interference power measuring
  • the receiving station 70 also includes a data quality measuring device 74 into
  • the data quality measuring device 74 is coupled with a processor 76 which receives
  • SIR target signal to interference ratio
  • a combiner 76 preferably a substracter, compares the measured SIR
  • combiner 76 is input to processing circuitry 77 which generates step up/down
  • the receiving station 70 also includes a transmitter 78 which is coupled
  • the receiving station's transmitter 78 also includes an input 80 for user data.
  • the receiving station 70 transmits its user data and the
  • the transmitting station 50 includes a receiver 56 and an associated
  • the transmitting station's receiver 56 receives the radio
  • the transmitting station's scale factor processor 55 has an input 58
  • the processor 55 receives the
  • the transmitting station's transmitter 51 sets its power based upon high-rate "step-up"
  • the SIR of the received data is measured by the measuring
  • the target SIR is that value (in theory) which, given that the data is
  • processing circuitry 77 via the receiving station's transmitter 78 and the transmitting
  • the power control system is considered "closed-loop" because of the high-rate
  • the quality of the received data is evaluated in the receiving station 70 by the
  • Typical metrics for digital data quality are bit error rate and
  • receiver to evaluate the metric, it is computed and compared with the desired metric
  • the updated target SIR is that value (in theory) which applied in
  • the receiver algorithm would cause the measured metric to converge to the desired
  • the updated target SIR is then used in the inner loop to determine the direction
  • processor 55 to control the power of the transmitter 51.
  • Figures 1 and 2 illustrate power control systems for single rate data
  • Figure 4 illustrates a modified closed-
  • loop power control system for wireless systems which communicate multiple data
  • loop power control system illustrated in Figure 1 is modified, as shown in Figure 3, to
  • the receiving station 30 the receiving station 30.
  • the user data for transmission is combined into a signal having a data
  • the data stream having the rate N(t) is converted to a data stream having a
  • the user data signal having the rate M(t) is
  • interference power measuring device 32 measures the interference of the signal as
  • the data quality measuring device 34 is coupled to
  • the user data path down stream the converter 47 and measures the quality of the data
  • loop power control system illustrated in Figure 2 is modified, as shown in Figure 4, to
  • the user data for transmission is combined into a signal having a data rate N(t).
  • the data stream having the rate N(t) is converted to a data
  • the user data signal having the rate M(t) is
  • interference power measuring device 72 measures the interference of the signal as
  • the data quality measuring device 73 is coupled to
  • the user data stream down stream the converter 87 and measures the quality of the data
  • N(t) the user data output from the remote receiver is at that same rate.
  • Data rate N(t) can be the composite of several data rates of different data channels
  • N is a
  • the date rate is changed from N(t) to M(t) and change back to N(t) in the remote
  • Data rate N(t) is the user data rate and the data rate M(t) is over-the-air data
  • M(t) is the number of bits per 10
  • Varying M is equivalent to varying the spreading factors and/or number of physical
  • varying N is equivalent to a data rate change in one or more
  • Rate M(t) is equivalent to N dataj bits per 10 msec, frame and N(t)
  • TrCHi bits per 10 msec, frame, during the time t when TFCy * is in effect where, as defined in
  • N g is the number of bits in a radio frame before rate matching on
  • RM i is the semi-static rate matching attribute for TrCH i which is
  • PL is the puncturing limit which value limits the amount of
  • N dataJ is the total number of bits that are available for a coded
  • TF t (j) is the transport format of TrCH i for the transport format
  • Transport Block is defined as the basic data unit exchanged
  • TBS or Transport Block Set is defined as a set of Transport Blocks
  • TrCH or Transport Channel are the channels offered by the physical
  • TF or Transport Format is defined as a format offered by Layer 1 to
  • Transport Format constitutes of two parts ⁇ one dynamic part
  • TFC or Transport Format Combination is defined as the combination
  • TFCS or Transport Format Combination Set is defined as a set of
  • MA C or Medium Access Control is a sub-layer of radio interface Layer
  • PDU or Protocol Data Unit is a unit of data specified in an (ISO-
  • Up-conversion of a data rate can be implemented by repetition, that is,
  • received bits 2 and 5 have twice the energy per
  • variable multirate data are virtually the same as those shown in Figures 1 and 2 for
  • Figure 3 and Figure 4 represent open and closed power control
  • variable rate system however, at some time, t, N, and/or M changes.
  • the outer loop which operates at a
  • transmitting station's converter 27 provides an additional input 29 to the scale factor
  • P ⁇ s is the transmitting station's transmission power level in decibels.
  • SLR TARGET is determined in the receiving station.
  • I RS is the measure of the interference power level at the receiving station.
  • L is the path loss estimate in decibels for the most recent time slot for
  • L 0 the long term average of the path loss in decibels, is the running
  • CONSTANT VALUE is a correction term.
  • [0088] is a weighting value which is a measure of the quality of the estimated
  • path loss and is, preferably, based on the number of time slots between the time slot
  • the value of is between zero and one. Generally, if the
  • Equations 3 and 4 are equations for determining a.
  • D is the number of time slots between the time slot of the last path
  • the time slot delay If the delay is one time slot, is one.
  • D max is the
  • a typical value for a frame having fifteen time slots is
  • the target SIR will settle at a quiescent point yielding the desired data
  • N and/or M changes. As described above, where this results in an improvement to the measured data quality metric, more energy than
  • Figure 8 illustrates the invention as it applies to a closed loop power
  • the converter 67 provides an additional input 69 to the scale factor generating
  • the converter provides a signal equivalent to (N(t)/M(t)) so that the
  • scale factor output by the processor 55 via output 53 is a function of N(t)/M(t) as
  • the converter 87 outputs a signal equivalent to N(t)/M(t)
  • the combiner 88 combines the rate change data from
  • the processor 74 effectively outputs a
  • system of Figure 8 can be embodied in a single processor with processor 74.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
  • Time-Division Multiplex Systems (AREA)
PCT/US2001/021979 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system Ceased WO2002009311A2 (en)

Priority Applications (25)

Application Number Priority Date Filing Date Title
KR1020037001152A KR100842239B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
MXPA03000739A MXPA03000739A (es) 2000-07-26 2001-07-12 Control adaptable rapido de potencia para un sistema de comunicaciones de varias velocidades variables.
KR1020127010475A KR101325382B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
KR1020087004058A KR100926810B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법및 시스템
AU2001273402A AU2001273402A1 (en) 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system
JP2002514914A JP4684530B2 (ja) 2000-07-26 2001-07-12 可変マルチレート通信方式の高速適応電力制御
KR1020087025468A KR100966315B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
KR1020117020620A KR101267748B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
IL15407401A IL154074A0 (en) 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system
HK04102899.4A HK1060220B (en) 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system
KR1020037014715A KR100759296B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법및 시스템
KR1020097024224A KR20100003300A (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
KR1020127027526A KR101325309B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
EP01952673A EP1305894B1 (en) 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system
CNB018162827A CN1223112C (zh) 2000-07-26 2001-07-12 可变多速率通信系统的快速自适应功率控制
KR1020107029907A KR101184483B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
KR1020107013301A KR101163312B1 (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
DE60122740T DE60122740T2 (de) 2000-07-26 2001-07-12 Schnelle adaptive leistungssteuerung für ein multirate-kommunikationssystem
DE0001305894T DE01952673T1 (de) 2000-07-26 2001-07-12 Schnelle adaptive leistungssteuerung für einem multirate-kommunikationssystem
BR0113022-6A BR0113022A (pt) 2000-07-26 2001-07-12 Controle de potência de adaptação rápida para sistema de comunicações de múltiplas velocidades variáveis
CA002417242A CA2417242C (en) 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system
KR1020097009356A KR20090071626A (ko) 2000-07-26 2001-07-12 가변 다중 속도 통신 시스템용 고속 적응 전력 제어 방법 및 시스템
NO20030333A NO328536B1 (no) 2000-07-26 2003-01-22 Hurtig adaptiv effektkontroll for et variabelt multiratekommunikasjonssystem
IL193218A IL193218A (en) 2000-07-26 2008-08-04 Fast adaptive power control for a variable multirate communications system
IL200334A IL200334A (en) 2000-07-26 2009-08-11 Fast adaptive power control for a variable multirate communications system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22134800P 2000-07-26 2000-07-26
US60/221,348 2000-07-26
US22337500P 2000-08-07 2000-08-07
US60/223,375 2000-08-07

Publications (2)

Publication Number Publication Date
WO2002009311A2 true WO2002009311A2 (en) 2002-01-31
WO2002009311A3 WO2002009311A3 (en) 2002-05-30

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PCT/US2001/021979 Ceased WO2002009311A2 (en) 2000-07-26 2001-07-12 Fast adaptive power control for a variable multirate communications system

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