WO2000052846A2 - Procede de regulation de la puissance de transmission de stations radio dans un systeme de radiocommunication cdma - Google Patents

Procede de regulation de la puissance de transmission de stations radio dans un systeme de radiocommunication cdma Download PDF

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Publication number
WO2000052846A2
WO2000052846A2 PCT/DE2000/000631 DE0000631W WO0052846A2 WO 2000052846 A2 WO2000052846 A2 WO 2000052846A2 DE 0000631 W DE0000631 W DE 0000631W WO 0052846 A2 WO0052846 A2 WO 0052846A2
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WO
WIPO (PCT)
Prior art keywords
value
variance
signal
received signal
quality
Prior art date
Application number
PCT/DE2000/000631
Other languages
German (de)
English (en)
Other versions
WO2000052846A3 (fr
Inventor
Markus Dillinger
Martin Haardt
Egon Schulz
Original Assignee
Siemens Aktiengesellschaft
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
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2000052846A2 publication Critical patent/WO2000052846A2/fr
Publication of WO2000052846A3 publication Critical patent/WO2000052846A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—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. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225—Calculation of statistics, e.g. average, variance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—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. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—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. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/44—TPC being performed in particular situations in connection with interruption of transmission

Definitions

  • the invention relates to a method for setting the transmission power of radio stations in a CDMA radio communication system and a receiving device, on the basis of whose evaluation the necessary control instructions are generated.
  • radio communication systems messages (for example voice, image information or other data) are transmitted with the aid of electromagnetic waves via a radio interface.
  • the radio interface relates to a connection between a base station and subscriber stations, it being possible for the subscriber stations to be mobile stations or fixed radio stations.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • FDD operation frequency division duplex
  • ETSI STC SMG2 UMTS-Ll Tdoc SMG2 UMTS-Ll 221/98, dated August 25, 1998
  • TDD Operation time division duplex
  • a W-CDMA mode in which in a broadband frequency band, e.g. 5 MHz, a W-CDMA
  • the object of the invention is to adapt the transmission power generation to different conditions of the radio interface.
  • the object is achieved by the method with the features of claim 1 and the receiving device with the features of claim 16.
  • Advantageous developments of the invention can be found in the subclaims.
  • an averaging of the quality evaluation is carried out on the receiving side, which guarantees a more precise criterion for the quality of the transmission conditions.
  • a more precise assessment reduces the likelihood of an increase in the transmission power (thus unnecessary interference) or an inadequate transmission power (thus poor transmission quality).
  • a temporal variance of the received signal is determined and the averaging time adapted for the mean inversely proportional to the variance of the received signal. If the averaging time is not fixed, but follows the changes in the conditions of the radio interface, the transmission power can be improved individually for each connection. In the case of slow changes, the averaging time is long in order to obtain the most accurate estimate possible. With rapid changes a short averaging time is before ⁇ Trains t to be able to follow the changes in accordance quickly.
  • the quality assessment can be the result of channel estimation or data detection.
  • channel estimation symbols known to the receiving device are compared with the received signal.
  • the comparison result indicates the transmission conditions very well, but an error rate is only related to a few symbols.
  • the data detection evaluates a much larger number of symbols and thus offers greater statistical security. So-called "soft decision" information about the good to be detected can also be taken into account in order to better estimate the error rate. From J.G. Proakis, "Digital Communications", Mc-Graw-Hill, New York, 1995, pp. 483-489, the application of a "soft decoding" decoding m Viterbi decoders is explained.
  • FIG. 3 shows suggestions for the length of the averaging tents at different speeds of mobile radio stations MS.
  • the speed of the mobile stations only serves as a reference for the temporal variance of the transmission conditions of the radio interface.
  • the changes in the transmission conditions naturally also depend on other influences, e.g. Development of the radio cell, type of interference, indoor or outdoor radio coverage, etc.
  • the variance is determined by evaluating pilot symbols of the received signal, with, for example, a correlation of the received signals
  • the performance of the pilot symbols is used from time slot to time slot. This is done for example in a RAKE receiver, either correlations between the signal ⁇ components of individual delay paths of the RAKE receiver with approximately the same delay to the variance determination ⁇ miteinan be compared, one for employee turnover of the signals of individual delay paths of the RAKE receiver to determine the Va ⁇ Rianz is used or the number of newly discovered or disappeared powerful delay path of the received signal per measurement period is used as a measure of the variance.
  • This information can be generated in receiving devices without major additional effort, so that the method according to the invention can be easily implemented in existing receiver structures.
  • bit error rate BER is particularly suitable for quality assessment.
  • block or frame error rate (BLER, FER) can also be used as measured variables.
  • the method is advantageously carried out with a second, e.g.
  • the internal control combines that a second setpoint for a second signal quality evaluation is subjected to the adaptation value, a signal quality value determined from the received signal is compared with the second setpoint, and depending on the comparison result, a control instruction for increasing or reducing the transmission power to the transmitting radio station is transmitted.
  • the adjustment value thus influences the internal regulation.
  • the signal quality value of the second signal quality assessment is advantageously determined from a signal / noise ratio or from another quickly and easily ascertainable measurement variable of the received signal.
  • the adaptation value of the external regulation can take several sizes and can be set depending on the strength of the temporal variance. Larger steps should be allowed for rapid changes than for slow changes. An embodiment of the invention will be explained in more detail with reference to the beilie ⁇ constricting drawings.
  • 3 is a table of the relationship between mobile station speed and averaging time
  • Fig. 5 e ne schematic representation of a receiving device.
  • the mobile radio system shown in FIG. 1 as an example of a radio communication system consists of a multiplicity of mobile switching centers MSC which are networked with one another or which provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each provided with at least one device RNC for controlling the base stations BS and for allocating radio resources, i.e. a radio resource manager. Each of these RNC devices in turn enables a connection to at least one base station BS. Such a base station BS can establish a connection to a subscriber station, e.g. Set up mobile stations MS or other mobile and stationary devices. At least one radio cell is formed by each base station BS.
  • Connections VI, V2, V3 for the transmission of useful information ni and signaling information si are shown as examples in FIG. 1 as point-to-point connections between mobile stations MS and a base station BS.
  • An operation and maintenance center OMC implements control and maintenance functions for the mobile radio system or for parts thereof.
  • the functionality of this structure is different Radio communication systems transferable, m which the dung ⁇ OF INVENTION can be used, in particular for mini-access networks with wireless subscriber terminal and for censored in the frequency range unli- powered base stations and subscriber stations.
  • a reception signal is pre-filtered through a fitted at ⁇ filter, a RAKE m Kombmierer (RAKE receiver) processes.
  • the RAKE Kombmierer contains several Verzog mecanicspfade representing branches that are tailored to individual spreading codes, and thus extract a ge to a compound ⁇ sound proof signal from the composite signal of the reception signal.
  • a Viterbi decoder can thus carry out a connection-specific decoding of the signals obtained by the RAKE combiner. Viterbi decoding corresponds to data detection. At the same time, the signal / noise ratio can be measured for each of the signals.
  • Decoder with a first quality evaluation a bit error rate BER or equivalent values such as block error rate BLER or frame error rate FER.
  • An average value is determined from several of these determined bit error rates BER of a connection.
  • the averaging is running (movmg average), i.e. a window with several bit error rates BER is shifted by one value with each new determination. For the size of the window, i.e. the averaging times are discussed below.
  • the mean value is compared with a target value for the bit error rate BER and a difference value is determined.
  • This difference value is compared with a threshold value decoder with a threshold value. If the difference value is less than the threshold value, the is
  • This adjustment value is subtracted from the delayed adjustment value of the previous calculation, so that the solution ANPAS ⁇ a second target value (target value SIR) for the internal control of the transmission power is carried out for a subsequent period.
  • the inner, fast control loop is based on a measurement of the signal-to-noise ratio SIR for a connection which is obtained from the RAKE combiner.
  • the current signal-to-noise ratio SIR as the second signal quality evaluation is compared with the second setpoint and a difference value is generated. This difference value is fed to a threshold value separator, which is one for larger differences
  • Control instruction to increase or decrease transmission power generated.
  • This control instruction is transmitted in band to the transmitting radio station and is taken into account there in a subsequent transmission.
  • the transmission power of the mobile station MS is set.
  • the sending radio station is therefore the mobile station MS.
  • the evaluation of the received signals and the generation of the control instruction for increasing or decreasing the transmission power is carried out in a receiving device of the base station BS.
  • the method can also be used for the opposite transmission path.
  • the averaging time for the concurrent averaging is not designed to be constant, but rather is dependent on a temporal variance of the received signals.
  • the averaging time is short, for example 0.3 s.
  • the averaging time is increased for smaller variances; e.g. 0.6 or 6 s.
  • the decorrelation distance specifies the distance between two points whose slow with fading (signal fluctuations) are uncorrelated.
  • the center ⁇ averaging time is based on the time required at a given speed Ge ⁇ to pass to this distance between the two points.
  • the step size (step) of the adjustment value is also provided a ⁇ dependent on the temporal variance of the received signal. With a small variance, the step size is smaller than with a large variance.
  • the temporal variance is determined by evaluating pilot symbols according to FIG. 4.
  • a continuous signal which is denoted by an individual spreading code, a distinction can be made between a pilot with symbols known to the receiver and a data part with useful or signaling information ni, si.
  • the pilot is 8 or 16 bits depending on the transmission conditions.
  • the receiving device EE within a frame of length 635 ms that fills a time slot, the receiving device EE, according to FIG. 5, the receiving base station BS can use known symbols to estimate the transmission ratios with quality assessments.
  • the first quality rating is based on data detection and the second quality rating is based on channel estimation.
  • the quality assessment is used to optimize the specifications for the transmission power setting individually for the connection.
  • a data detector DT which combines the functions of the RAKE receiver and the Viterbi decoder, evaluates the received signal and carries out the described quality assessments.
  • An evaluation device AU evaluates the quality assessments and determines a temporal variance of the received signal.
  • the variance is determined consecutive by evaluating the correlation of the performance of the pilot symbols Empfangsmo ⁇ ments.
  • the correlation shows the differences in the transmission conditions from the comparison of the pilot symbols of successive time slots.
  • a ⁇ on each reception signal with an individual spreading code for each an individual delay time is set.
  • the delay paths are correlators, the output signals of which are superimposed after the evaluation. This corresponds to the temporal spread of the signal due to the multipath propagation.
  • the temporal variance is determined based on the correlations between the signal components of individual delay paths of the RAKE receiver with approximately the same delay.
  • a fluctuation (power changes over time) of the signals of individual delay paths of the RAKE receiver to determine the variance or the number of newly discovered or disappeared powerful delay paths of the received signal per measurement period can be used as a measure of the variance.
  • the averaging time and step size are derived from the variance and set by a control device ST by reading from a table.
  • the evaluation device AU determines an average value from several quality evaluations, compares the average value with the setpoint value and, in the event of a deviation between the mean value and the setpoint value, calculates the adaptation value, which further influences the instruction for setting the transmission power.
  • a signaling device SIG generates an instruction for the transmission power control for the mobile station MS based on the quality evaluations of the inner and outer regulation.
  • the instruction contains at least three options: increase, maintain or reduce the transmission power.
  • the instruction is transmitted to the mobile station MS via the HF part HF-T and the antenna device AE.
  • the selection and coding of the control instructions can be found in ETSI SMG2 UMTS Ll # 8, Tdoc SMG2 UMTS Ll 549/98, Siemens AG, dated November 9, 1998.

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

Abstract

L'invention concerne un procédé de régulation de la puissance de transmission de stations radio dans un système de radiocommunication W-CDMA. Selon ledit procédé, un moyennage de l'évaluation de la qualité est exécuté côté réception, ce moyennage garantissant un critère plus précis pour la qualité des conditions de transmission. Côté réception est déterminée une variance temporelle du signal reçu et le temps de moyennage pour la valeur moyenne est adapté de façon inversement proportionnelle à la variance du signal reçu. Si le temps de moyennage n'a pas été prédéterminé de façon fixe, mais qu'il suit les variations des rapports de l'interface radio, la régulation de la puissance de transmission peut être améliorée individuellement pour chaque liaison.
PCT/DE2000/000631 1999-03-03 2000-03-01 Procede de regulation de la puissance de transmission de stations radio dans un systeme de radiocommunication cdma WO2000052846A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19909299.0 1999-03-03
DE1999109299 DE19909299A1 (de) 1999-03-03 1999-03-03 Verfahren zur Sendeleistungseinstellung von Funkstationen in einem CDMA Funk-Kommunikationssystem

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WO2000052846A2 true WO2000052846A2 (fr) 2000-09-08
WO2000052846A3 WO2000052846A3 (fr) 2002-06-13

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WO (1) WO2000052846A2 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2001013536A1 (fr) * 1999-08-18 2001-02-22 Nokia Corporation Commande de connexion dans un systeme de communication
WO2004004173A1 (fr) * 2002-06-27 2004-01-08 Koninklijke Philips Electronics N.V. Mesure de caracteristiques de canal dans un systeme de communication

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CN101018081A (zh) 2000-05-01 2007-08-15 交互数字技术公司 时分双工通信系统中多下行链路时隙的下行链路功率控制
US7085239B2 (en) * 2001-01-05 2006-08-01 Qualcomm, Incorporated Method and apparatus for determining the forward link closed loop power control set point in a wireless packet data communication system
US20030114179A1 (en) * 2001-12-17 2003-06-19 D.S.P.C. Technologies Ltd. Method and apparatus for generating a quality measure target value based on channel conditions
US7280842B2 (en) 2001-12-17 2007-10-09 Marvell International Ltd. Wireless communication device and method for communicating in site selection diversity mode
WO2003085861A1 (fr) 2002-04-05 2003-10-16 Fujitsu Limited Unite de communication et procede de regulation de la puissance de la boucle exterieure
US7515883B1 (en) 2002-12-16 2009-04-07 Marvell D.S.P.C. Ltd. Wireless communication device and method for communicating in site selection diversity mode

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WO1994006218A1 (fr) * 1992-09-04 1994-03-17 Telefonaktiebolaget Lm Ericsson Procede et dispositif de regulation de puissance de transmission
WO1996009696A2 (fr) * 1994-09-22 1996-03-28 Nokia Telecommunications Oy Procede de regulation de puissance d'emission et systeme de radiocommunications cellulaire
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Cited By (6)

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WO2001013536A1 (fr) * 1999-08-18 2001-02-22 Nokia Corporation Commande de connexion dans un systeme de communication
US7050823B1 (en) 1999-08-18 2006-05-23 Nokia Corporation Connection control in a communication system
WO2004004173A1 (fr) * 2002-06-27 2004-01-08 Koninklijke Philips Electronics N.V. Mesure de caracteristiques de canal dans un systeme de communication
JP2005531247A (ja) * 2002-06-27 2005-10-13 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 通信システムにおけるチャンネル特性の測定
US7392014B2 (en) 2002-06-27 2008-06-24 Koninklijke Philips Electronics N.V. Measurement of channel characteristics in a communication system
KR100987651B1 (ko) * 2002-06-27 2010-10-13 코닌클리즈케 필립스 일렉트로닉스 엔.브이. 통신 시스템, 제 1 및 제 2 스테이션, 통신 시스템 작동방법

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DE19909299A1 (de) 2000-09-21

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