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WO2007067004A2 - Terminal et procede de controle de puissance d'emission - Google Patents

Terminal et procede de controle de puissance d'emission Download PDF

Info

Publication number
WO2007067004A2
WO2007067004A2 PCT/KR2006/005318 KR2006005318W WO2007067004A2 WO 2007067004 A2 WO2007067004 A2 WO 2007067004A2 KR 2006005318 W KR2006005318 W KR 2006005318W WO 2007067004 A2 WO2007067004 A2 WO 2007067004A2
Authority
WO
WIPO (PCT)
Prior art keywords
gain
power
transmission signal
terminal
signal
Prior art date
Application number
PCT/KR2006/005318
Other languages
English (en)
Other versions
WO2007067004A3 (fr
Inventor
Dae-Ho Kim
Jun-Woo Kim
Kyung-Yeol Sohn
Hyeong-Sook Park
Youn-Ok Park
Original Assignee
Samsung Electronics Co., Ltd.
Electronics And Telecommunications Research Institute
Sk Telecom Co., Ltd
Kt Corporation
Hanaro Telecom., Inc.
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 claimed from KR1020060118803A external-priority patent/KR101315478B1/ko
Application filed by Samsung Electronics Co., Ltd., Electronics And Telecommunications Research Institute, Sk Telecom Co., Ltd, Kt Corporation, Hanaro Telecom., Inc. filed Critical Samsung Electronics Co., Ltd.
Priority to US12/095,275 priority Critical patent/US7970363B2/en
Publication of WO2007067004A2 publication Critical patent/WO2007067004A2/fr
Publication of WO2007067004A3 publication Critical patent/WO2007067004A3/fr

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]
    • H04W52/18—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
    • 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]
    • H04W52/30—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
    • 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]
    • H04W52/52—Transmission power control [TPC] using AGC [Automatic Gain Control] circuits or amplifiers
    • 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
    • H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
    • 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
    • H04W52/246—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter calculated in said terminal

Definitions

  • the present invention relates to a terminal of a communication system. More particularly, the present invention relates to a method for controlling transmission power of a terminal.
  • a power controlling method in a communication system is one of radio resource management methods for efficiently using limited frequency resources, and it solves a near-far problem.
  • CDMA code division multiple access
  • transmission power of the terminal is determined by a gain of a power amplifier. Accordingly, in the CDMA communication system, an open-loop power control operation for compensating a path loss caused by a distance between a base station and the terminal, and a power control operation for compensating inaccuracy of the open-loop power control operation, are performed by controlling the gain of the power amplifier. Since the terminal uses one code channel in the CDMA communication system, the gain of the power amplifier may be controlled to perform the power control operation in a cell.
  • the transmission power of the terminal is set to be lower than that of the base station so that one subchannel may be used in a cell boundary area. Accordingly, since the terminal may use subchannels from a single subchannel to all subchannels, the limit of a full loading range (FLR), which is a distance in which the terminal may use all the subchannels, may be restricted. In the FLR, the power amplifier of the terminal uses a maximum gain.
  • FLR full loading range
  • the terminal positioned outside the FLR may not perform the open- loop power control operation for increasing the gain of the power amplifier to compensate the path loss that increases according to an increase of the distance between the base station and the terminal.
  • an initial ranging (IR) signal transmitted by the terminal outside of the FLR has a low strength when it is received by the base station, an initial ranging operation may not be performed.
  • the present invention has been made in an effort to provide a terminal for
  • An exemplary terminal includes a power amplifier, an open-loop power controller, and a gain controller.
  • the power amplifier amplifies transmission power of a transmission signal.
  • the open-loop power controller measures a received signal strength to control the transmission power, and increases a gain of the power amplifier according to the received signal strength.
  • the gain controller sets a power concentration gain and applies the power concentration gain to the transmission signal when the gain of the power amplifier is maximized.
  • the power concentration gain may be determined by extra power
  • a maximum value of the power concentration gain is determined by a difference between power according to the number of subchannels used in the transmission signal and power according to all subchannels.
  • the open- loop power controller may increase the gain.
  • the gain controller may increase the power concentration gain and apply the power concentration gain to the transmission signal.
  • a transmission signal is transmitted after transmission power of the transmission signal is amplified by applying a first gain to the transmission signal. It is checked whether the first gain is a maximum value when there is no response to the transmission signal, and a second gain is applied to the transmission signal when the first gain is the maximum value.
  • a digital transmission signal is converted to an analog transmission signal; the analog transmission signal is transmitted after transmission power is amplified by applying a first gain to the analog transmission signal; it is checked whether the first gain is a maximum value when there is no response to the analog transmission signal; and a second gain is applied to the digital transmission signal by setting the second gain when the first gain is the maximum value.
  • the open-loop power control operation may be performed by controlling the power concentration gain. Accordingly, the terminal positioned outside the FLR may normally perform the initial ranging operation.
  • FIG. 1 schematically shows a block diagram representing a terminal of a communication system according to an exemplary embodiment of the present invention.
  • FIG. 2 schematically shows a graph representing transmission signal characteristics according to a variation of the number of subchannels in the communication system.
  • FIG. 3 schematically shows a flowchart of a method for controlling transmission power according to the exemplary embodiment of the present invention.
  • block will be understood to indicate a unit for processing at least one function or operation, which may be realized by hardware, software, or a combination thereof.
  • a terminal of a communication system according to an exemplary embodiment of the present invention, and a transmission power controller and a transmission power control method, will be described with reference to the drawings.
  • an orthogonal frequency division multiplexing access (OFDMA) communication system will be exemplified.
  • FIG. 1 schematically shows a block diagram representing the terminal of the communication system according to the exemplary embodiment of the present invention.
  • the terminal according to the exemplary embodiment of the present invention includes a modulator 100, a gain controller 200, a digital/analog converter (DAC) 300, a power amplifier 400, and an open-loop power controller 500.
  • DAC digital/analog converter
  • the modulator 100 modulates a transmission signal to be transmitted to a base
  • the open-loop power controller 500 measures a received signal strength, determines an open-loop power control value and a gain of the power amplifier 400, and transmits the open-loop power control value and the gain to the power amplifier 400.
  • the gain controller 200 applies a power concentration gain (PCG) to a modulated digital transmission signal when the gain of the power amplifier 400 is maximized.
  • the DAC 300 converts the digital transmission signal modulated by the modulator 100 or the digital transmission signal to which the PCG is applied into an analog signal, and transmits the analog signal to the power amplifier 400.
  • the power amplifier 400 uses the open-loop power control value and the gain to amplify power of the analog signal.
  • the gain controller 200 includes a maximum gain detector 210, a power concentration gain increasing unit (hereinafter referred to as a "PCG increasing unit") 220, and a gain controller 230, and the open-loop power controller 500 includes a received signal strength measuring unit 510, a gain increasing unit 520, and an adder 530.
  • PCG increasing unit power concentration gain increasing unit
  • the received signal strength measuring unit 500 In the open-loop power controller 500, the received signal strength measuring unit
  • the 510 measures a strength of a signal that is currently received from the base station (i.e., an average power level of the currently received signals) to output the open-loop power control value.
  • the gain increasing unit 520 increases the gain of the power amplifier 400 when there is no response to the transmission signal from the base station for a predetermined time.
  • the adder 530 transmits a value obtained by adding the open-loop power control value and the gain of the power amplifier 400 to the power amplifier 400.
  • the open-loop power control value corresponds to a negative value of the received signal strength.
  • the maximum gain detector 210 controls the PCG
  • the PCG increasing unit 220 when the gain of the power amplifier 400 is maximized.
  • the PCG increasing unit 220 transmits the PCG to the gain controller 230, and the gain controller 230 applies the PCG to the transmission signal modulated by the modulator 100.
  • the PCG increasing unit 220 may increase the PCG by a predetermined value when the transmission power is low.
  • Jx _ power of the power amplifier 400 is given as Math Figure 1.
  • PCG denotes a power concentration gain
  • TNTT PWR respectively denote nominal power and initial adjustment as system parameters.
  • ⁇ Access Channel Correction denotes a sum of gains increased by the power amplifier 400 for the response to the transmission signal.
  • the open-loop power controller 500 transmits the open-loop power control value
  • the power amplifier 400 may perform the open-loop power control operation by increasing the transmission power when the received signal strength is low and decreasing the transmission power when the received signal strength is high.
  • FIG. 2 schematically shows a graph representing transmission signal characteristics according to a variation of the number of the subchannels in the communication system.
  • a horizontal axis shows the number of subchannels used in the terminal, and a vertical axis denotes a power level [dB].
  • the terminal may use one subchannel to all subchannels to satisfy various data rates and service qualities. As shown in FIG. 2, the transmission power of an output signal of the modulator 100 shown in FIG. 1 increases when the number
  • the power in a case of the 96 subchannels increases by 19.8dB compared to the power in a case of 1 subchannel. That is, while the gain of the power amplifier 400 shown in FIG. 1 is fixed, the transmission power may vary by 19.8dB according to the variation of the number of subchannels.
  • the extra power generated when the number of subchannels is limited may be used as the power concentration gain.
  • a maximum PCG may be used as the power concentration gain.
  • PCG M4X (N SCH ) Power (N U4X SCH ) - Power (N SCH )
  • the PCG increasing unit 220 may use the maximum 19.8dB
  • PCG when one subchannel is used, and may use the maximum 5dB PCG when 30 subchannels are used.
  • FIG. 3 schematically shows a flowchart of the method for controlling the transmission power according to the exemplary embodiment of the present invention.
  • the terminal transmits an initial ranging signal.
  • the open-loop power controller 500 shown in FlG. 1 of the terminal sets the gain Tx_Gain of the power amplifier 400 shown in FlG. 1 as an initial value Open_Loop_Gain in step S310, and the terminal amplifies power of the initial ranging signal by the power amplifier 400 and transmits the amplified initial ranging signal in step S320. Subsequently, the terminal waits for a response to the initial ranging signal from the base station for a predetermined time T in step S330.
  • the base station may not demodulate the initial ranging signal and may not transmit the response signal.
  • the maximum gain detector 210 checks in step S350 whether the gain Tx_Gain of the power amplifier 400 is a maximum gain Max PA_Gain.
  • the gain increasing unit 520 increases the gain Tx_Gain of the power amplifier 400 by a predetermined value Stepl to set the gain
  • the terminal uses the increased gain Tx_Gain to amplify the power of the initial ranging signal, transmits the amplified initial ranging signal in step S320, and repeatedly performs operations from the step S330.
  • the terminal applies the PCG to the initial ranging signal in step S370. Since the gain Tx_Gain of the power amplifier 400 is fixed to the maximum value when the terminal is positioned outside the FLR, the transmission power may be controlled by the PCG. In this case, when the PCG is a digital value, the gain controller 230 may apply the PCG to the initial ranging signal before the initial ranging signal is input to the DAC 300 shown in FlG. 1. In addition, the terminal increases the PCG by a predetermined value Step2 and set the PCG (PCG + Step l ⁇ PCG) in step S380.
  • the maximum value to which the PCG may increase is determined by the number of subchannels used in the initial ranging operation as described in Math Figure 3. Subsequently, the terminal transmits the initial ranging signal in step S320 to which the PCG is applied in step S370, and repeatedly performs operations from the step S330.
  • the base station may demodulates the initial ranging signal and transmit the response signal.
  • the terminal may perform the initial ranging in step S390.
  • the open-loop power control operation may be performed by controlling the power concentration gain. Accordingly, the terminal positioned outside the FLR may normally perform the initial ranging operation.
  • exemplary embodiment of the present invention but, on the contrary, are intended to be realized by a program for realizing functions corresponding to the configuration of the exemplary embodiment of the present invention or a recording medium for recording the program.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Terminal de système de communications comprenant : amplificateur de puissance, contrôleur de puissance en boucle ouverte, contrôleur de gain, modulateur, et convertisseur numérique /analogique. L'amplificateur amplifie la puissance d'émission d'un signal d'émission. Le contrôleur de puissance en boucle ouverte mesure une intensité de signal reçu pour contrôler la puissance d'émission, et augmente le gain de l'amplificateur selon cette intensité. Le contrôleur de gain établit un gain de concentration de puissance et applique ce gain au signal d'émission lorsque le gain de l'amplificateur est accru. Le modulateur module le signal d'émission. Le convertisseur convertir un signal d'entrée en signal analogique. Le contrôleur de gain applique le gain de concentration de puissance au signal d'émission modulé par le modulateur, et transmet le gain de concentration de puissance au convertisseur.
PCT/KR2006/005318 2005-12-08 2006-12-08 Terminal et procede de controle de puissance d'emission WO2007067004A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/095,275 US7970363B2 (en) 2005-12-08 2006-12-08 Terminal and method for controlling transmission power

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2005-0119930 2005-12-08
KR20050119930 2005-12-08
KR10-2006-0118803 2006-11-29
KR1020060118803A KR101315478B1 (ko) 2005-12-08 2006-11-29 단말기 및 그 송신 전력 제어 방법

Publications (2)

Publication Number Publication Date
WO2007067004A2 true WO2007067004A2 (fr) 2007-06-14
WO2007067004A3 WO2007067004A3 (fr) 2008-07-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2006/005318 WO2007067004A2 (fr) 2005-12-08 2006-12-08 Terminal et procede de controle de puissance d'emission

Country Status (1)

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WO (1) WO2007067004A2 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3109589B2 (ja) * 1998-03-18 2000-11-20 日本電気株式会社 Ｃｄｍａ端末の送信パワー調整方法及び装置
US6256502B1 (en) * 1998-12-23 2001-07-03 Nortel Networks Limited Wideband multicarrier power control for a cellular PCS basestation tranmitter
WO2001005057A1 (fr) * 1999-07-08 2001-01-18 Telefonaktiebolaget Lm Ericsson (Publ) Commande de puissance d'emission pour stations de base equipees mcpa

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Publication number Publication date
WO2007067004A3 (fr) 2008-07-31

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