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WO2008145073A1 - Procédé, dispositif et système tdd pour réguler la puissance de transmission - Google Patents

Procédé, dispositif et système tdd pour réguler la puissance de transmission Download PDF

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Publication number
WO2008145073A1
WO2008145073A1 PCT/CN2008/071150 CN2008071150W WO2008145073A1 WO 2008145073 A1 WO2008145073 A1 WO 2008145073A1 CN 2008071150 W CN2008071150 W CN 2008071150W WO 2008145073 A1 WO2008145073 A1 WO 2008145073A1
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WO
WIPO (PCT)
Prior art keywords
transmit power
frequency block
time
actual
signal
Prior art date
Application number
PCT/CN2008/071150
Other languages
English (en)
Chinese (zh)
Inventor
Wei Ruan
Yinggang Du
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008145073A1 publication Critical patent/WO2008145073A1/fr

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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
    • 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
    • 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]
    • H04W52/18—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

Definitions

  • the invention relates to the field of carrier communication, in particular to a transmission power control method and a device for time division duplex (TDD) system.
  • TDD time division duplex
  • Orthogonal Frequency Division Multiplexing is a multi-carrier transmission technology that divides the spectrum into many sub-carriers. Each sub-carrier is modulated at a lower rate, because this technology has good performance. It is resistant to multipath delay and is therefore widely used in cellular mobile systems. Multiple access to OFDM, or 0FDMA, can be achieved by allocating different subcarriers to different users. Each narrowband subcarrier uses different modulation schemes, such as 16QAM, 64QAM, etc., and then uses Inverse Fast Fourier Transforms (IFFT) to provide OFDM modulation. The data to be transmitted is mapped to the symbol of OFDM, and after IFFT, the cyclic prefix is added and sent out. The receiving end uses the Fast Fourier Transforms (FFT) to solve the OFDM symbols, and extracts the data mapped to the symbol.
  • FFT Fast Fourier Transforms
  • the Wa 1 sh code is an orthogonal spreading code and is commonly used as a spreading code in a spread spectrum system.
  • the Wa 1 sh code can eliminate or suppress multiple access interference (Multiple Access Interferences).
  • the Walsh code can also be used for the transmission of information sequences. For example, a 10-bit information series can be mapped to a Walsh code of length 1024, and a 1024 Walsh code is used at the receiving end to correlate with the received information series, due to the Walsh code.
  • Orthogonality the series of information can be recovered by detecting the largest correlation peak, which is non-coherent detection. Mapping of information sequences belonging to different channels of different users into After the Wa l sh code, different scrambling codes are added to implement multiplexing of the same physical resources by different channels of different users.
  • the channels sent by different users on different channels can be regarded as interference processing.
  • Resource assignment information reduces the overhead of control information.
  • the reverse control channel of the OFDM system In order to improve the communication quality of the system, a similar spread spectrum scheme is proposed in the reverse control channel of the OFDM system.
  • the characteristics of the Wahl code are used to transmit the control information.
  • the frame length transmitted in each control channel is generally less than or equal to 10 bits (corresponding to 1024 sequences).
  • each control channel occupies a subset. Row or column), get a 1024-bit Wahl code, and then scramble the Wahl code.
  • the access channel is also treated similarly.
  • the WALSH codes scrambled by different uplink control channels are added and combined, and the combined 1024 bits are interleaved and scrambled by another scrambling code to distinguish different cell or sector.
  • the output 1024 bits are divided into 8 sub-blocks, each block contains 128 bits, and 128-point FFT (FAST FOURIER TRANSFORMATION) is output for each block. 128 complex values are obtained, and the resulting 1024 complex values are carried in the 0FDM system. Continuous 128 subcarriers and 8 symbols.
  • a reverse control block occupies a bandwidth of 1.25 MHz and the length of one physical frame. This system superimposes different user data of different channels on the same physical resource, and does not need resource assignment information when the system performance is satisfied.
  • the receiving algorithm is non-coherent reception.
  • FDD frequency division duplex mode
  • the channel of the block is a coherent channel.
  • the channel gain of each time-frequency block on the control block channel is the same. Therefore, the transmit power on each time-frequency block is exactly the same at the time of transmission.
  • the channel gain of the entire control segment is not a uniform value, and there is always a difference between each time-frequency block, especially in fast fading channels, so this assumption is relatively rough. of. Therefore, when transmitting control information and transmitting according to this assumption, orthogonality between different Wa s codes cannot be guaranteed. In the synchronous system, the orthogonality of the Wahl code can be fully guaranteed only when the channels are completely consistent. If the channel changes, the orthogonality is destroyed, which increases the probability of error. A waste of information. Summary of the invention
  • the purpose of the embodiments of the present invention is to provide a method for adjusting the transmit power and a device for timely splitting and duplexing according to the defect that the performance of the non-coherent detection is poor when transmitting the control information in the FDD mode, and the uplink and downlink channels can be according to the TDD mode. Symmetrical characteristics adjust the uplink transmit power to achieve good non-coherent detection performance.
  • an embodiment of the present invention provides a method for adjusting a transmission power, including the following steps:
  • an embodiment of the present invention further provides a transmit power adjustment apparatus, including:
  • a channel gain obtaining module configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal
  • a transmit power adjustment module configured to be connected to the channel gain obtaining module, configured to adjust an original transmit power of each time-frequency block signal according to the channel gain value, to obtain an actual transmit power of each time-frequency block signal.
  • An embodiment of the present invention further provides a time division duplex system, including at least one transmit power adjustment device, where the transmit power adjustment device is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal, according to the The channel gain value adjusts the original transmit power of the respective time-frequency block signals to obtain the actual transmit power of the respective time-frequency block signals.
  • the embodiment of the present invention utilizes the symmetry of the uplink and downlink channels of the TDD device, obtains the channel gain value according to the downlink pilot signal, and adjusts the original transmit power of each time-frequency block signal, thereby reducing the time-varying channel pair.
  • the destruction of the orthogonality of the uplink control channel improves the non-coherent detection performance of the uplink channel.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for adjusting transmit power according to the present invention
  • FIG. 2 is a schematic flow chart of a second embodiment of a method for adjusting transmit power according to the present invention
  • FIG. 3 is a schematic flow chart of a third embodiment of a method for adjusting a transmit power according to the present invention.
  • FIG. 4 is a schematic structural view of a first embodiment of a transmission power adjusting device according to the present invention.
  • FIG. 5 is a schematic structural diagram of a second embodiment of a transmission power adjusting apparatus according to the present invention.
  • FIG. 6 is a schematic structural diagram of a third embodiment of a transmission power adjusting device according to the present invention.
  • FIG. 7 is a schematic structural view of a fourth embodiment of a transmission power adjusting apparatus according to the present invention. detailed description
  • the channel gain is obtained by using the symmetry of the uplink and downlink channels in the TDD mode before the signal is transmitted, and then the transmit power is adjusted, thereby improving the non-coherent detection performance of the uplink channel.
  • FIG. 1 is a schematic flowchart diagram of a first embodiment of a method for adjusting a transmission power according to the present invention. This embodiment includes the following steps:
  • Step 1 01 Obtain, according to the downlink pilot signal received by the terminal, a channel gain value of each time-frequency block signal, where a channel gain value of the time-frequency block signal is a channel gain value of the sub-carrier;
  • Step 1 02 Adjust an original transmit power of each time-frequency block signal according to the channel gain value before performing uplink transmission, to obtain an actual transmit power of each of the sub-carrier signals.
  • This embodiment is applicable to a mobile communication system adopting a TDD mode, in which different time slots on the same frequency channel (ie, carrier) are received and transmitted to ensure time to separate the receiving and transmitting channels, thereby making full use of the wireless spectrum. . Since the same frequency channel is used, it can be used for downlink reception. To estimate the channel gain. The original transmit power is adjusted by using the channel gain, and the adjusted actual transmit power is obtained, and then the signal is transmitted, thereby improving the transmission performance of the uplink control channel.
  • a TDD mode in which different time slots on the same frequency channel (ie, carrier) are received and transmitted to ensure time to separate the receiving and transmitting channels, thereby making full use of the wireless spectrum.
  • interpolation including linear interpolation or nonlinear interpolation
  • the channel gain of the embodiment includes amplitude and phase, and the original transmit power of each time-frequency block signal is represented by Sij, where the signal of Sij is used as the interleaved scrambled signal, which may be randomized
  • the signal in the channel, or the control channel such as the reverse ACK channel, the CQI channel in the C-A control block, the BFCH channel, the VCQI channel, the MCQI channel, and the SFCH channel, may also be any other channel using non-coherent detection.
  • the original transmit power of each time-frequency block signal can be divided by the channel gain to obtain the actual transmit power of each new time-frequency block signal, that is, the following formula:
  • the maximum value or threshold may be directly taken as follows:
  • sign ( ) is a symbolic function.
  • the range of values of the subscripts i and j varies according to the channel. For example, each 2*8 reverse ACK control block in the reverse ACK channel is selected after the DFT sequence is selected and scrambled, but is adjusted by the above method.
  • the amplitude of Sij is constant, and the phase change is also small, and the phase and amplitude of H vary greatly. Therefore, in order to binize the type of the transmitted signal, quantization can also be performed, for example, the phase is quantized into 4 Levels, 1/4, 3 1/4, 5 1/4, and 7 1/4, respectively, quantify the amplitude as Dry grades, and so on. This approach can also partially mitigate the effects of degeneration on the downlink to uplink channel.
  • the adjustment process is to directly divide the transmission power by the channel gain value.
  • the quantization is a number of levels, and the division of the channel gain values of the predetermined phases can be achieved by the existing phase retarder. This quantization method takes into account both the time-varying channel gain value and the hardware implementation cost.
  • the method further includes quantizing the channel gain to a preset phase and
  • FIG. 2 it is a schematic flowchart of the second embodiment of the method for adjusting the transmit power of the present invention. It can be seen from the previous embodiment that the adjusted total transmit power may exceed the transmit power before the adjustment. In order to maintain the consistency of the power before and after, and does not affect the overall power control, it is also possible to perform normalization adjustment based on the total transmit power before and after the adjustment.
  • the embodiment further includes step 103, that is, calculating the total transmit power and the actual transmit power of each time-frequency block signal respectively.
  • the original transmit power and the total actual transmit power and determine whether the total actual transmit power is greater than the total original transmit power, if yes, perform step 104; otherwise, use the obtained actual transmit power for signal transmission; Step 1 04 for the actual time-frequency block
  • the transmit power performs a normalization operation.
  • the total original transmit power is expressed by ⁇
  • the total actual transmit power is expressed by ⁇
  • the normalization condition may be further limited, that is, if the ratio of the total actual transmit power to the total original transmit power is less than a preset threshold, the actual transmit power may be directly used for signal transmission, otherwise the normalization operation is performed. For example, if the total actual transmit power is increased by 5% or less relative to the total original transmit power, normalization is not required, and when it exceeds 5%, normalization is performed to ensure the consistency of the total transmit power before and after the adjustment.
  • step 100 determines whether the channel transmitted by the signal satisfies the coherent condition. If the coherent condition is met, the adjustment operation in the first embodiment is performed. If not, the direct transmission may be performed in the existing manner.
  • the terminal capability For how to determine whether the channel transmitted by the signal satisfies the coherent condition, it can be selected according to the terminal capability. If the terminal supports the speed measurement function, it can determine whether the speed of the terminal exceeds the speed threshold, and if it exceeds, it determines that the coherent condition is not satisfied. If the terminal does not support the speed measurement, it may be determined whether the amplitude of the channel gain value of each time-frequency block signal exceeds the amplitude threshold, that is, when the multiple difference between the maximum value and the minimum value of the channel gain is greater than the amplitude threshold, it is determined that the correlation is not satisfied. And determining whether the number of consecutive changes in the sign of the real or imaginary part of the channel gain value of each time-frequency block signal exceeds the number of times threshold, and if so, determining that the coherent condition is not satisfied.
  • Step 100 in this embodiment can also be applied to the second embodiment described above.
  • FIG. 4 it is a schematic structural diagram of a first embodiment of a transmit power adjustment apparatus according to the present invention, including a channel gain obtaining module 1 and a transmit power adjustment module 2, and the channel gain obtaining module 1 can obtain each time frequency according to a downlink pilot signal.
  • Block channel gain value; transmit power adjustment module 2 and letter The channel gain obtaining module 1 is connected to adjust the original transmit power of the respective time-frequency block signals according to the channel gain value to obtain actual transmit power of the respective time-frequency block signals.
  • the transmit power adjustment module 2 further includes a calculation module 21 and a transmit power determination module 22, wherein the calculation module 21 is connected to the channel gain obtaining module 1.
  • the original transmit power of each time-frequency block signal can be divided by the channel gain to obtain the actual transmit power of each new time-frequency block signal.
  • the transmit power determining module 22 is configured to determine whether the actual transmit power of each time-frequency block signal meets a preset range. If the actual transmit power of the time-frequency block signal is not within the preset range, set a predetermined transmit power value as the time-frequency block signal. Actual transmit power.
  • the transmit power adjustment module in this embodiment further includes: a total original power calculation module 23, The actual transmit power module 24 and the normalization module 25.
  • the total original power calculation module 23 is connected to the calculation module 21 for calculating the total original transmission power according to the original transmission power of each time-frequency block signal.
  • the total actual transmit power module 24 is coupled to the calculation module 21 for calculating the total actual transmit power based on the actual transmit power of each time-frequency block signal.
  • the normalization module 25 is connected to the total original power calculation module 23 and the total actual transmit power module 24, and after obtaining the actual transmit power of each time-frequency block signal, if the total actual transmit power is greater than the total original transmit power, the time will be The actual transmit power of the frequency block is normalized.
  • FIG. 7 is a schematic structural diagram of a fourth embodiment of a transmit power adjustment apparatus according to the present invention.
  • the embodiment further includes a coherent condition determination module 3, a channel gain obtaining module 1 and a transmission.
  • the power adjustment module 2 is connected to determine whether the channel for signal transmission satisfies the coherent condition, and then performs an adjustment operation; otherwise, the original transmission power is directly used for signal transmission.
  • the transmission power adjustment system embodiment of the present invention includes at least one transmission power adjustment device, and the transmission power adjustment device is configured to obtain channel gain values of respective time-frequency block signals according to the downlink pilot signals, and the respective The original transmit power of the time-frequency block signal is adjusted to obtain the actual transmit power of the respective time-frequency block signals.
  • the transmit power adjustment module may include a channel gain obtaining module and a transmit power adjustment module, where the channel gain obtaining module is configured to obtain a channel gain value of each time-frequency block signal according to the downlink pilot signal; and a transmit power adjustment module is configured to use the channel gain The value adjusts the original transmit power of each time-frequency block signal to obtain the actual transmit power of the respective time-frequency block signals, which is connected to the channel gain obtaining module.
  • the respective transmit power adjustment means given in the above embodiment of the apparatus can also be used in the embodiment of the present system.
  • the present invention utilizes the symmetry of the uplink and downlink channels of the TDD device, obtains the channel gain value according to the downlink pilot signal, and obtains the original transmit power of each subcarrier signal.
  • the adjustment is performed to reduce the disruption of the orthogonality of the uplink control channel by the time-varying channel, and the non-coherent detection performance of the uplink channel is improved.

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

Abstract

La présente invention concerne un procédé pour réguler la puissance de transmission qui comprend les étapes consistant à : recevoir un signal pilote de liaison descendante et acquérir la valeur de gain de canal de chaque signal de bloc temps-fréquence ; en fonction de ladite valeur de gain de canal, réguler la puissance de transmission principale de chaque signal de bloc temps-fréquence et acquérir la puissance de transmission réelle de chaque signal de bloc temps-fréquence. La présente invention présente également un dispositif pour réguler la puissance de transmission qui comprend un module d'acquisition de gain de canal et un module de régulation de puissance de transmission. En outre, la présente invention propose un système TDD qui comprend au moins un dit dispositif pour réguler la puissance de transmission. Les modes de réalisation de la présente invention acquièrent la valeur de gain de canal conformément à un signal pilote de liaison descendante en utilisant la symétrie de la liaison montante et de la liaison descendante du système TDD, et régulent la puissance de transmission principale de chaque signal de sous-porteuse de manière à réduire les dommages occasionnés à l'orthogonalité du canal de commande de liaison montante par rapport au canal variant dans le temps et à améliorer la performance de détection non cohérente dans le canal de liaison montante.
PCT/CN2008/071150 2007-05-31 2008-05-30 Procédé, dispositif et système tdd pour réguler la puissance de transmission WO2008145073A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200710109395.9 2007-05-31
CNA2007101093959A CN101316125A (zh) 2007-05-31 2007-05-31 发射功率调整方法及系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101873615A (zh) 2009-04-27 2010-10-27 松下电器产业株式会社 无线通信系统及其下行链路接收功率检测方法
CN103458530B (zh) * 2013-09-05 2017-01-25 华为技术有限公司 随机接入方法和用户设备
CN103686766B (zh) * 2013-12-27 2017-03-22 京信通信系统（中国）有限公司 一种gsm基放信号覆盖的适配方法及装置
CN109041189B (zh) * 2018-07-20 2021-07-30 深圳全志在线有限公司 一种无线通信设备的发射功率控制方法及装置
CN109474306B (zh) * 2018-09-20 2021-01-26 中国人民解放军63653部队 一种基于直扩信号捕获的检测判决方法

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CN1512802A (zh) * 2002-12-27 2004-07-14 皇家飞利浦电子股份有限公司 具有功率控制的移动终端与方法
US20060068827A1 (en) * 2004-09-28 2006-03-30 Lucent Technologies, Inc. Measuring power of a pilot channel of a transmit signal
CN1941689A (zh) * 2005-09-29 2007-04-04 上海原动力通信科技有限公司 时分双工ofdm系统子频带调度的方法

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CN1136242A (zh) * 1995-04-25 1996-11-20 美国电报电话Ipm公司 无线网中功率电平控制的方法和设备
CN1512802A (zh) * 2002-12-27 2004-07-14 皇家飞利浦电子股份有限公司 具有功率控制的移动终端与方法
US20060068827A1 (en) * 2004-09-28 2006-03-30 Lucent Technologies, Inc. Measuring power of a pilot channel of a transmit signal
CN1941689A (zh) * 2005-09-29 2007-04-04 上海原动力通信科技有限公司 时分双工ofdm系统子频带调度的方法

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