WO2004034605A1 - Procede et systeme de commande adaptative de puissance de boucle exterieure basee sur la mesure de ber - Google Patents

Procede et systeme de commande adaptative de puissance de boucle exterieure basee sur la mesure de ber Download PDF

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Publication number
WO2004034605A1
WO2004034605A1 PCT/CN2002/000849 CN0200849W WO2004034605A1 WO 2004034605 A1 WO2004034605 A1 WO 2004034605A1 CN 0200849 W CN0200849 W CN 0200849W WO 2004034605 A1 WO2004034605 A1 WO 2004034605A1
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WIPO (PCT)
Prior art keywords
sir
ber
value
target value
power control
Prior art date
Application number
PCT/CN2002/000849
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English (en)
Chinese (zh)
Inventor
Zhiyu Xu
Baijun Zhao
Original Assignee
Utstarcom (China) Co., Ltd.
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Filing date
Publication date
Application filed by Utstarcom (China) Co., Ltd. filed Critical Utstarcom (China) Co., Ltd.
Priority to AU2002349456A priority Critical patent/AU2002349456A1/en
Publication of WO2004034605A1 publication Critical patent/WO2004034605A1/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

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to an adaptive outer loop power control method and system based on bit error rate BER measurement in a third generation mobile communication system. Background technique
  • the SIR target value needs to be adjusted according to the UE's moving speed and multipath fading environment. The greater the change in received power, the higher the SIR target value. If a fixed SIR target value is set, it is easy to make the communication quality too high or too low, resulting in unnecessary power boost and capacity loss. Therefore, the purpose of the outer loop power control is to provide the required quality: neither too bad nor too good. Too bad, can't satisfy the user's call quality; too good, it wastes capacity, and finally makes the network easy to be congested and the blocking rate is too high, which reduces the performance of the network.
  • the upstream receiver combines the received multipath signals through a rake receiver.
  • the signals combined by the rake receiver are divided into two paths, one of which is deinterleaved and decoded by the deinterleaver 106 and the decoder 105, respectively.
  • Interleaving/deinterleaving also known as interleaving/deinterleaving, can be used to spread burst errors into random independent errors that are easily corrected by error correcting codes.
  • the decoded signal measures the BLER or BER in the BLER/BER measurement unit 101 as an input parameter to the outer loop power control algorithm unit 102.
  • the other way passes through the SIR measurer 104 for measuring the signal SIR to obtain the SIR measurement.
  • the output parameter SIR target value of the outer loop power control algorithm unit 102 is then compared with the SIR measurement value in the comparator 103, and a power control command (TPC) is generated from the relationship between the two values.
  • the cyclic redundancy check code (CRC) is usually used to measure the correctness of the received target data block when measuring the BLER.
  • CRC cyclic redundancy check code
  • the algorithm in the 3GPP (Third Generations Partnership Project) specification is that the base station controller updates the SIR target value every time it receives a data block.
  • the specific algorithm is as follows:
  • Step—down BLER_target * Step— size
  • Step_up Step— size - BLER target * Step size
  • SIR— target (n+1) SIR— target(n) + Step one up;
  • Step-size is the step value of the target SIR adjustment.
  • BLER_target is the target BLER value of the user service.
  • FER frame error rate
  • BLER block error rate
  • the BLER is also very low, which requires a considerable amount of time to make accurate measurements.
  • BER target value 10
  • the target BLER value requirement is less than 10_ 3.
  • the BLER measurement parameter is generally greater than 5000 frames, that is, 400 seconds. Such long measurement time is not in practical application.
  • some soft information may be needed, for example, intermediate BLER measurements in multi-cycle Turbo decoding or intermediate BLER measurements in convolutional codes and Reed-Solomon codes. See H. Kawai, H. Suda and F. Adachi,, Outer-loop control of target SIR for fast transmit power control in turbo-coded W-CDMA mobile radio", Electronics Letters, vol. 35, no. 9, pp. 699-701, Mar. 1999.
  • these soft messages are optional parameters in the 3GPP standard, and wireless network controllers (RNCs) do not always have access to these soft messages.
  • ACM Wireless Networks 2001 refers to an outer loop power control algorithm based on analyzing the nonlinear relationship between BER and SIR. But due to fading channels The difference in environment, plus the influence of coding and decoding, is a nonlinear relationship between BER and SIR. It is very complicated to obtain the determined relationship between them.
  • the present invention provides an adaptive outer loop power control method based on BER measurement, comprising the following steps: a. measuring BER to obtain BER measurement value; b. based on measured BER value Adjusting the SIR target value; c.
  • the measured adaptive outer loop power control system comprises: a BER measuring device for obtaining a BER measurement value; an outer loop power control device for terminating the SIR target value according to the BER measurement value; and a comparator for the SIR target The value is compared to the SIR measurement and a power control command is generated.
  • the BER measuring device is located at the front end of the channel decoder.
  • the measurement time can be significantly reduced, the channel variation can be quickly converged and tracked, and the previous block rate based BLER is overcome.
  • the algorithm converges too slowly and is not easy to implement in high-quality services, so that the target SIR can be quickly adaptively adjusted to achieve neither BER nor BER performance.
  • the method is further based on the formula target SIR value,
  • SIRi, n+1 is the SIR target value of the i-th user n + 1 times
  • Bi is the BER target value of the user
  • SIRi, min is the minimum SIR required for the user service. value.
  • the value can be 1.
  • Another advantage of the method and system is that it does not need to know the specific relationship between BER and SIR, and overcomes the complexity of the existing outer loop power control algorithm based on analyzing the nonlinear relationship between BER and SIR. .
  • the method and system of the present invention can effectively achieve the goal of an outer loop power control algorithm: to obtain the desired BER and BLER with minimal transmit power.
  • FIG. 1 is a block diagram of a prior art process for implementing a reverse closed loop power control
  • FIG. 2 is a block diagram of a process for implementing a reverse closed loop power control in accordance with the present invention
  • FIG. 3 is a flow chart for implementing a reverse closed loop power control process in accordance with the present invention.
  • FIG. 4 is a flow chart for comparing the relationship between the BER measurement value and the BER target value
  • FIG. 5 is a flow chart for comparing the relationship between the SIR measurement value and the SIR target value
  • FIG. 6 is a case of channel coding and channelless coding. Coding gain comparison
  • Figure 7 shows the result of adjusting the SIR target value by the outer loop power control algorithm in accordance with the present invention
  • Figure 8 shows the results of BER measurements in an outer loop power control algorithm in accordance with the present invention.
  • FIG. 2 is a block diagram of a process for implementing a reverse closed loop power control in accordance with the present invention.
  • a BER measurer 201 is placed at the front end of the decoder 205, i.e., the transmission channel BER (TrCH BER) is measured at the input of the decoder.
  • the BER measurer 201 herein can be any of the BER measuring devices of the prior art.
  • the BER measurer is located between the decoder and the deinterleaver, those skilled in the art will appreciate that the BER measurement unit can be located elsewhere in the decoder, enabling other locations for BER measurements, for example, when the BER measurer
  • the BER measurement is obtained by regenerating the encoded data stream using a decoding and encoder to compare with the received interfered encoded data stream.
  • the transport channel BER is the result of an average BER measurement of a dedicated physical data channel (DPDCH) in a wireless connection, which refers to the BER parameter measured before the decoder in the case of coding.
  • the measurement period is generally a transmission time interval (TTI).
  • TTI transmission time interval
  • the TTI can be 10, 20, 40 or 80 ms. Different transport channels may use different TTIs.
  • the reason for measuring the BER at the input of the channel decoder is that they differ by a codec gain relative to the BER typically measured at the output of the channel decoder.
  • the codec gain is relatively fixed and relatively easy to measure by simulation.
  • channel coding can significantly improve reception performance. 6, in the Rayleigh fading channel, at the same BER (eg 10_ 2) performance, using a rate 1/2 convolutional code to obtain a receiver gain of 8dB codec receiver than without channel coding. Therefore, the difference between the codec gain of the input and output of the decoder is also used to solve the problem of high-quantity service BER measurement.
  • the data frame is 80ms (including the interleaving depth).
  • the 80ms TTI measurement interval can obtain the transmission channel BER measurement with a measurement error of ⁇ 4%, thus solving the high-quality service BLER/BER measurement of the normal outer loop power control algorithm.
  • the problem of long time It will be understood by those skilled in the art that the values given herein are merely exemplary, and they will vary according to the encoder and the channel.
  • the measurement time interval is different according to different services.
  • the transmission digital rate requirement and the accuracy of the BER measurement and measurement requirements are determined. Generally speaking, the larger the transmission digital rate, the shorter the measurement time, and the lower the BER value or the higher the measurement accuracy requirement, the measurement time The longer the interval.
  • the BER measurement result obtained from the BER measuring unit 210 is stored in the quality estimation (QE) field of the FP (frame protocol) frame.
  • Node B transmits the uplink FP frame to the Outer Loop Power Control (OLPC) unit 202 located in the Radio Network Controller (RNC) via the lub interface, where reverse outer loop power control is performed.
  • OLPC Outer Loop Power Control
  • the SIR measurement obtained from the SIR measurer 204 is compared in the comparator 203, thereby generating a power control command TPC, which is transmitted down to the UE for power control.
  • the BER of the decoder front end is measured and transmitted to the OLPC unit 202 in step 310.
  • the OLPC unit adjusts the SIR target value based on the relationship between the BER measurement and the desired BER target value.
  • the OLPC unit 202 After passing the outer loop power control unit, if the SIR target value changes, the OLPC unit 202 notifies the node B of the new SIR target value via the lub FP control frame "uplink outer loop power control" signaling.
  • node B obtains the SIR target value, it compares it with the SIR measurement measured by SIR measurer 204, thereby generating a TPC that controls the UE's transmit power.
  • the OLPC obtains the BER measurement value, and then in step 322, the SIR target value is adjusted by comparing the relationship between the BER measurement value and the BER target value.
  • the BER of the i-th user measured at the nth time is represented by BERi(n)
  • the target BER is represented by Bi
  • the n + 1th SIR target value can be obtained according to the following formula:
  • SIRi min is the minimum SIR required for the current service of the i-th user.
  • the lowest SIR in the formula is to ensure that the algorithm does not converge to zero.
  • ⁇ is used to adjust the convergence speed of the algorithm in different fading environments.
  • the SIR target value Adjust the step size to la
  • the value can be .
  • the formula is reduced to
  • Formula (2) which is further compressed into
  • the SIR target value can be adjusted based on the relationship between the BER target value and the actual BER measurement. The specific adjustments are as follows (see steps 3221 - 3223 in Figure 4):
  • the SIR target value remains unchanged
  • the SIR target value is lowered by a certain step size
  • the SIR target value is increased by a certain step size.
  • One of the advantages of this algorithm is that it can be adaptively adjusted according to the actual situation of the channel.
  • the motion is reduced until the algorithm converges.
  • the convergence between the BER target value and the actual BER measurement value is very close, and the SIR target value remains unchanged.
  • this algorithm does not need to know the specific relationship between BER and SIR, and it is relatively simple to implement.
  • the complexity of the outer loop power control algorithm based on analyzing the nonlinear relationship between BER and SIR is overcome.
  • step 330 of Fig. 3 The specific operation in step 330 of Fig. 3 will be described below with reference to Fig. 5.
  • the OLPC unit 202 informs the node B through the Iub FP control frame "uplink outer loop power control" signaling.
  • the outer loop power control method of the present invention is completed.
  • FIG. 7 is a result of adjusting an SIR target value according to the outer loop power control method of the present invention
  • FIG. 8 is a BER measurement result in the outer loop power control method according to the present invention.
  • the initial SIR target value is 7dB
  • the parameter SIR deviation represents the standard deviation of the SIR target value (a logarithmic normal distribution of random variables) with a value of ldB.
  • the time interval measurement unit in the figure is a TTI.
  • the outer loop power control method quickly adjusts the SIR target value to about 7.9 dB based on the difference between the BER target value and the BER measurement value, while the BER measurement value in Figure 8 is stable at 10- 6 nearby.
  • the power control method according to the present invention can quickly lower the SIR target value, thereby reducing the UE transmit power and reducing the other User interference.
  • the method can quickly track and increase the SIR target value to the original stable SIR value of 7.9 dB.
  • the method increases the target SIR value, so that the UE increases the transmission power, thereby making the BER measurement value.
  • the BER measurement in Figure 8 is calculated from the channel BER in the QE combined with the channel coding gain. This explains that at time points 10, 20, 31 and 41, the BER measurement will be as low as 10 ⁇ 7 and 1 ( ⁇ 8 orders of magnitude.
  • the present invention provides methods and systems for performing outer loop power control in high quality communications. It can reduce the measurement time of the outer loop power control under the premise of high shield business. It uses the BER measurement information in the quality estimation (QE) domain, that is, the transmission channel BER to adjust the SIR target value, which is easy to implement, can quickly converge and track channel changes, and can quickly and adaptively adjust the SIR target value to achieve not too bad, nor Too good "BER performance. Moreover, it does not need to know the specific relationship between BER and SIR, overcoming the complexity of the existing outer loop power control algorithm based on analyzing the nonlinear relationship between BER and SIR. Two preferred embodiments N2002/000849
  • the Node B needs to transmit the BER measurement value to the RNC through the Iub interface. If there is any change in the SIR target value, the RNC also needs to pass the corresponding signaling through the Iub interface. Notify node B.
  • the first and second embodiments of the present invention describe the uplink outer loop power control algorithm in Node B, which can also be similarly applied to the downlink outer loop power control calculation in the mobile station. At this time, the functions of the RNC and Node B are concentrated in the mobile station.
  • the embodiment is similar to the embodiment of the first embodiment, and the same portions will not be described in detail, and only the differences will be described below.
  • the BER target value is notified to the mobile station after being set by the RNC.
  • the mobile station measures the BER value according to the aforementioned method and adjusts the SIR target value according to the algorithm.
  • the mobile station simultaneously measures the SIR of the received signal, and compares it with the SIR target value to obtain a downlink fast inner loop power control command, and then sends it to the node B for downlink power control.
  • the present invention can also be implemented in the following manner when the quality requirements of the user service are not high.
  • the system architecture shown in Figure 1 can still be employed, i.e., the BLER/BER is measured at the back end of the decoder, except that the outer loop power control unit 102 is replaced by the outer loop power control (OLPC) unit 202 of the present invention.
  • the measured parameter is BER
  • the outer ring according to the present invention can be directly implemented according to formula (1). Power control method. If the measured parameter is BLER, then a scaling device is needed to convert the BLER value to the BER value in some way before performing the subsequent operations. Subsequent operations are the same as those described in the first embodiment and will not be described in detail herein.
  • control can also be implemented in other ways, for example, through a program. , look up the table or through the combination of software and hardware.
  • the user equipment UE may be any user equipment having a wireless access function, including but not limited to a mobile phone, a portable computer, a personal digital assistant, and the like.
  • a wireless access function including but not limited to a mobile phone, a portable computer, a personal digital assistant, and the like.
  • the invention is illustrated in a preferred embodiment of the invention for use in a DS/CDMA system, the invention is also applicable to all systems requiring outer loop power control, including but not limited to IS95 systems, WCDMA systems, TD-SCDMA, and Cdma2000 system, etc.

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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 et un système de commande adaptative de puissance de boucle extérieure basée sur la mesure du BER. Ledit procédé consiste à : mesurer le BER afin d'obtenir la valeur mesurée de BER au niveau du frontal d'un décodeur ; régler la valeur objet de SIR en fonction de la valeur mesurée de BER ; comparer la valeur objet à la valeur mesurée de BER, et générer une instruction de commande de puissance. Ledit procédé permet de réduire sensiblement le temps de mesure pendant le processus de commande de puissance de boucle extérieure. Par ailleurs, il est facile à mettre en oeuvre car il ne nécessite pas la connaissance de la relation entre BER et SIR.
PCT/CN2002/000849 2002-09-26 2002-11-26 Procede et systeme de commande adaptative de puissance de boucle exterieure basee sur la mesure de ber WO2004034605A1 (fr)

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CNB021435014A CN100469182C (zh) 2002-09-26 2002-09-26 一种基于误码率测量的自适应外环功率控制方法和系统
CN02143501.4 2002-09-26

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US7609791B2 (en) 2006-04-21 2009-10-27 Telefonaktiebolaget L M Ericsson (Publ) Iterative decoding with intentional SNR/SIR reduction
CN102316568A (zh) * 2010-07-05 2012-01-11 中兴通讯股份有限公司 闭环功率控制处理方法及基站

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WO2006015516A1 (fr) * 2004-08-12 2006-02-16 Zte Corporation Procede et dispositif permettant d'optimiser la valeur du rapport signal-brouillage (sir) dans la regulation de la puissance de transmission d'un systeme de communication cdma
CN100429876C (zh) * 2005-02-24 2008-10-29 Ut斯达康通讯有限公司 Cdma系统中外环功率控制方法和系统
CN101068121B (zh) * 2007-06-04 2010-08-18 华为技术有限公司 一种外环功率控制中信干比目标值的调整方法和装置
JPWO2010123022A1 (ja) * 2009-04-23 2012-10-25 三洋電機株式会社 通信装置及び通信システム
CN101754345B (zh) * 2009-12-29 2012-07-04 华为技术有限公司 发射功率的控制方法及通信设备
CN102291765B (zh) 2010-06-21 2016-03-30 中兴通讯股份有限公司 一种外环功率控制方法和装置
WO2014205828A1 (fr) * 2013-06-29 2014-12-31 华为技术有限公司 Procédé, appareil et système de commande de puissance
WO2015062008A1 (fr) 2013-10-31 2015-05-07 华为技术有限公司 Procédé et appareil pour transmettre des données de mesure de réseau de fréquence de signal de diffusion multidiffusion

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