WO2013037213A1 - Procédé et appareil d'étalonnage de puissance - Google Patents

Procédé et appareil d'étalonnage de puissance Download PDF

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Publication number
WO2013037213A1
WO2013037213A1 PCT/CN2012/075377 CN2012075377W WO2013037213A1 WO 2013037213 A1 WO2013037213 A1 WO 2013037213A1 CN 2012075377 W CN2012075377 W CN 2012075377W WO 2013037213 A1 WO2013037213 A1 WO 2013037213A1
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WO
WIPO (PCT)
Prior art keywords
power
pilot
remote unit
pseudo pilot
radio remote
Prior art date
Application number
PCT/CN2012/075377
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English (en)
Chinese (zh)
Inventor
闫浩
唐肖剑
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2013037213A1 publication Critical patent/WO2013037213A1/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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels

Definitions

  • the present invention relates to the field of communications, and in particular to a power calibration method and apparatus.
  • BACKGROUND OF THE INVENTION Currently, Time Division-Synchronous Code Division Multiple (Time Division-Synchronous Code Division Multiple)
  • TD-SCDMA Time Division Multiple Access
  • the supported frequency bands are 1880mhz ⁇ 1920mhz (F-band), 2010mhz ⁇ 2025mhz (A-band), and 2300mhz ⁇ 2400mhz (E-band).
  • RRU Remote RF Unit
  • cross-spectrum power amplifiers are expensive to manufacture, and gain uniformity over a wide spectrum is difficult to guarantee. Therefore, the two signals are separately used for up-conversion and mixing, and finally, after the cavity filter is combined, transmitting from one antenna becomes the primary method for the RRU to realize multi-band RF signal output.
  • the RRU shoulders the task of digitally upconverting and mixing the baseband signal into a radio frequency signal.
  • the stability of the radio frequency signal determines the stability of the coverage of the entire cell.
  • For user equipment (User Equipment, UE for short) Access plays a decisive role.
  • the power calibration module of the RRU system software is mainly responsible for ensuring the stability of the RRU output power.
  • the power control of the RRU is generally implemented by feedback closed-loop power control.
  • the implementation methods include: 1.
  • the microwave detection tube directly performs closed-loop control in the RF part; 2.
  • the digital attenuation of the transmission channel by software after analog-to-digital conversion The device is adjusted to ensure that the power of the transmitting port is stable.
  • the downlink pilot time slot is stable in baseband power because it transmits the SYNC_DL (downlink synchronization code) sequence at all times.
  • the stability of the downlink pilot slot power can be utilized to perform closed-loop power control on the primary carrier, thereby achieving the purpose of stabilizing the RF signal power of the antenna interface.
  • a cross-band cell refers to establishing multiple sectors under one cell and establishing corresponding carrier groups under multiple sectors. Since there is only one primary carrier in one cell and the SYNC_DL sequence is only transmitted on the primary carrier, there is only one SYNC_DL sequence in one cell.
  • a cross-band cell is implemented, that is, a multi-carrier cell is established on two (or more) different frequency bands.
  • the primary carrier exists in one of the frequency bands, and only the secondary carrier is established on the other frequency bands to expand the bearer service.
  • a cell has only one primary carrier. If the primary carrier is established on the F-band RRU, the R-band of the A-band does not have a primary carrier, but only the secondary carrier.
  • Fig. 1 a schematic diagram of a channel carrying structure in the related art is shown.
  • the RRU since there is no primary carrier on some RRUs, the RRU cannot implement power calibration. In addition, since there is no downlink pilot power on the RRU, the digital pre-distortion (DPD) is also affected, and the output antenna port power is affected. Also, even if the DPD is not considered, the channel state cannot be determined because the detection channel power standing wave ratio cannot be detected.
  • DPD digital pre-distortion
  • a power calibration method including: a radio remote unit filling a pseudo pilot on a secondary carrier-free channel with a pseudo pilot; and the radio remote unit using the pseudo pilot for power calibration.
  • the radio remote unit fills the secondary carrier on the secondary carrier-free channel with the pseudo pilot.
  • the radio remote unit fills the pilot time slot of the first secondary carrier on the channel without the primary carrier. frequency.
  • the method further includes: the radio remote unit receiving the cell identifier sent by the baseband pool unit; the radio remote unit according to the cell identifier Generate a pseudo pilot.
  • the method further includes: the radio remote unit filling data on one time slot of the secondary carrier; The time slot serves as a sampling point for digital predistortion.
  • the radio remote unit performs power calibration using the pseudo pilot: the radio remote unit determines the power of the pseudo pilot according to the current cell configuration power, and adjusts the determined pseudo pilot power by the power factor; the radio remote unit Power calibration is performed using pseudo-pilot power transmit pseudo pilots.
  • a power calibration apparatus comprising: a padding module configured to fill a pseudo carrier on a secondary carrier-free channel with a pseudo pilot; and a calibration module configured to use the pseudo pilot Power calibration.
  • the padding module is arranged to fill the pilot slots of the first secondary carrier on the channel without the primary carrier with dummy pilots.
  • the apparatus further includes: a receiving module, configured to receive a cell identifier sent by the baseband pool unit; and a generating module, configured to generate a pseudo pilot according to the cell identifier.
  • the apparatus further includes: a data filling module, configured to fill the time slot of the secondary carrier after filling the pseudo pilot; and the opening module is configured to use the time slot as the sampling point to enable the digital predistortion.
  • the calibration module comprises: a determining submodule, configured to determine the power of the pseudo pilot according to the current cell configuration power; an adjustment submodule, configured to adjust the power of the pseudo pilot determined by the power factor adjustment; and the transmitting submodule is set to Power calibration is performed using pseudo-pilot power transmit pseudo pilots.
  • the method of filling the pseudo-pilot on the channel without the main carrier and performing power calibration using the pseudo-pilot solves the problem that the power calibration of the channel without the main carrier cannot be performed in the related art, and further The effect of calibrating a channel without a primary carrier is achieved.
  • FIG. 1 is a schematic diagram of a channel carrying structure according to the related art
  • FIG. 2 is a flowchart of a power calibration method according to an embodiment of the present invention
  • FIG. 3 is a flow chart of power calibration according to Embodiment 3 of the present invention
  • 4 is a schematic diagram of a DPD turn-on flow according to Embodiment 3 of the present invention
  • FIG. 1 is a schematic diagram of a channel carrying structure according to the related art
  • FIG. 2 is a flowchart of a power calibration method according to an embodiment of the present invention
  • FIG. 3 is a flow chart of power calibration according to Embodiment 3 of the present invention
  • 4 is a schematic diagram of a DPD turn-on flow according to Embodiment 3 of the present invention
  • Embodiment 1 This embodiment provides a power calibration method, which can be used to implement power control when an RRU carries a cross-band cell in a TD-SCDMA access system.
  • 2 is a flowchart of a power calibration method according to an embodiment of the present invention. As shown in FIG.
  • Step S202 A radio remote unit fills a secondary carrier on a channel without a primary carrier with a pseudo pilot.
  • Step S204 the radio remote unit performs power calibration using the pseudo pilot.
  • the primary carrier has a pilot, and therefore, the channel having the primary carrier can be power-controlled by the pilot.
  • the secondary carrier has no pilot, and therefore, the prior art cannot Power control is performed on channels without a primary carrier.
  • a pseudo pilot for example, a SYNC_DL sequence
  • the power control of the channel without the primary carrier may be performed by using the pilot to perform power control on the channel with the primary carrier in the related art, and details are not described herein again.
  • Step S202 can adopt multiple implementation manners, and only one of the preferred modes is described.
  • the BP and the radio remote unit fill the pilot time slot of the first secondary carrier on the channel without the primary carrier with a dummy. Pilot.
  • This embodiment provides a specific filling position of the pseudo pilot, which has the advantage of being easy to implement. It should be noted that other filling positions can be easily conceived by those skilled in the art as long as it is on the secondary carrier on the channel without the primary carrier.
  • the technical effect of the present invention can be achieved by filling the pseudo pilot.
  • the method may further include: the radio remote unit receiving the cell identifier (cell ID, or Cell) sent by the baseband unit (BBU) Parameter ID), then, generate a pseudo pilot based on the cell identity.
  • the pseudo pilot is generated according to the cell identifier, so that the pseudo pilot can be more in line with actual needs, thereby effectively performing power calibration.
  • the radio remote unit may generate a pseudo pilot according to the correspondence between the cell identifier and the pilot.
  • the method may further include: the radio remote unit fills data in one time slot of the secondary carrier; and the radio remote unit uses the time slot as the sampling point.
  • the opening of digital predistortion achieves the opening of digital pre-distortion by filling data on time slots.
  • the time slot of the padding data may be TS0. Selecting TS0 instead of the time slot filling data of other transport services can reduce the impact on service transmission.
  • the step S204 may include: the radio remote unit determines the power of the pseudo pilot according to the current cell configuration power, and adjusts the determined pseudo pilot power by the power factor; the radio remote unit uses the pseudo pilot power transmission pseudo. Pilot, perform power calibration. This embodiment enables power calibration using pseudo pilots.
  • Embodiment 2 This embodiment adopts a field programmable gate array (Field Programable Gate) by using a pilot slot of a first secondary carrier on a channel without a primary carrier (or a single-channel RRU without a primary carrier on the RRU).
  • Array abbreviated as FPGA
  • FPGA field programmable gate array
  • SYNC_DL sequence the pseudo-pilot (for example, the SYNC_DL sequence) for power calibration. Since the SYNC_DL sequence in a cell is unique, the Cell Parameter ID that is sent to the RRU by the BBU can be translated and filled by the interface of the interface between the RRU and the BBU, that is, the interface between the RRU and the BBU. SYNC_DL sequence.
  • the control of the power level of the padding data can be implemented by the maximum transmit power of the RRU air interface and the baseband data delivered by the BBU obtained by the FPGA (for example, IQ data, where I is an in-phase component, The projection of the representative vector on the horizontal axis; Q is the 90 degree phase shift (Quadrate) component.
  • the IQ data is the baseband data after quadrature modulation. I is the component on the X axis, and Q is the component on the y axis.
  • the baseband data can be used instead. There is a strict correspondence between the powers. Therefore, it is only necessary to estimate the power of the filled dummy data through the cell configuration power, and adjust the power factor of the FPGA to ensure the pseudo pilot power.
  • the DPD related function can be implemented in the following manner:
  • the RRU performs equalization processing of the transmission and feedback signals before the DPD starts, wherein the equalization is performed by the RRU system software after the cell is established, according to a digital signal processor (Digital Signal Processor, referred to as DSP) calculates the difference between the transmit and feedback signals of a certain time slot (for example, TS0) of the carrier to adjust the gain of the feedback channel; then, according to the existing cell establishment process and DPD, the equalization and formal adaptation process are started.
  • DSP Digital Signal Processor
  • the RRU performs frequency point validity check; 3.
  • the power calibration initiates open loop power calibration;
  • RRU DSP control module referred to as RDSP
  • CFR Crest Factor Reduction
  • the RDSP calculates the attenuation of the downlink digital attenuator value according to the open loop power calibration; 6. The RDSP sets the feedback channel digitally controlled attenuator to full attenuation;
  • RDSP obtains the power difference (does a power detection), and re-adjusts the downlink digital attenuator according to the detected power;
  • the RDSP repeatedly reads the DSP power difference (Errorpwr), and adjusts the feedback channel attenuation and the digital equalizer (eq) according to the difference until the Errorpwr meets the power DPD algorithm matching requirement.
  • the power calibration and the power detection can be implemented in the following manners: For the power detection and the VSWR detection, after the open loop power calibration is completed, the RRU initiates the detection of the power, and detects the downlink pilot time slot (Downlink Pilot Time Slot, respectively). For the forward power and reverse power of DWPTS), then, the standing wave ratio is calculated according to the detected reverse and forward power, and then the corresponding closed loop power calibration is performed according to the antenna port power estimated by the forward detection.
  • Embodiment 3 The BBU and the RRU add a cell parameter configuration message. After receiving the message, the RRU determines whether the configured cell has a primary carrier. If there is no primary carrier, notifies the RRU main control module to initiate an open loop power calibration. After the BBU establishes the configuration for the RRU, the BBU configures the Cell Parameter ID to the RRU.
  • the RRU notifies the main control module to initiate an open loop power calibration according to the condition of the cell main carrier.
  • the RRU master module sets the transmit pseudo-main carrier data, and notifies the FPGA to send the data of the corresponding carrier and triggers the open loop power calibration.
  • the RRU sends a training sequence to the designated channel in the DWPTS slot for VSWR detection.
  • FIG. 3 is a flowchart of a BBU establishing a cell without a primary carrier for performing open loop power calibration, and the process includes the following steps:
  • the BBU After receiving the cell setup response message of the RRU, the BBU sends a Cell Parameter ID Configuration Request message to the RRU.
  • the RRU After receiving the Cell Parameter ID Configuration Request message, the RRU sends a Cell Parameter ID Configuration Response message to the BBU. S306, the RRU detects whether the configured cell has a primary carrier, and if the cell has a primary carrier, does not process; if the cell does not have a primary carrier, the RRU control configuration module sends a message to the RRU main control module to notify the RRU main control module of the cell parameter. Configuration, where the parameter configuration includes: a Cell Parameter ID, and a Cell Parameter ID is sent by the BBU to the RRU. S308. The RRU calculates a Sys_group_No (synchronization code group number) according to the obtained Cell Parameter ID. If it is detected that the cell has no primary carrier, the RRU looks for Carrier_No (the minimum frequency sequence number of the configured cell), and Carrier_No can be obtained by looking up the table.
  • Sys_group_No synchronization code group number
  • the RRU adjusts the power according to the cell power P_factor (calculated amplitude factor), so as to achieve the purpose of achieving stable power.
  • P_factor calculated amplitude factor
  • the RRU places the TS0 data according to Sys_group_No, P_factor, and TS0 (slot zero)
  • the RRU places the DWPTS data to the corresponding address of the FPGA according to Sys_group_No, P_factor and DWPTS (downlink pilot time slot).
  • the RRU sends a time slot enable according to the antenna serial number, the carrier number Carrier_No, and the slot number, and sets the DWPTS time slot and the TS0 time slot data transmission enable of the FPGA respectively; the RRU main control module initiates the open loop power calibration.
  • the RRU main control module receives the open loop power calibration completion information sent by the power calibration module, and then stops transmitting the TS0 time slot data, and triggers closed loop power detection.
  • RRU power calibration module performs standing wave ratio detection.
  • the RRU main control module receives the information about the completion of the power detection fed back by the power calibration module, and then stops transmitting the DWPTS test data.
  • the DPD needs to be enabled in the open loop process, and the DPD solution needs to capture a maximum power to start the DPD process on the TS0.
  • the carrier without the primary carrier does not have the physical control channel (PCCH) power. Therefore, a set of data needs to be filled on TS0 in order to complete the DPD opening process.
  • 4 is a schematic diagram of a DPD opening process according to Embodiment 3 of the present invention. As shown in FIG. 4, the DPD opening process includes:
  • the RRU software sets the IQ data power of the TS0 training sequence according to the maximum power configuration value in all valid single channels.
  • the RRU software writes the IQ training sequence to a TSO downlink buffer random access memory (RAM) provided by the FPGA.
  • RAM downlink buffer random access memory
  • the RRU software sets the TSO time slot training sequence of the minimum effective carrier to be enabled, and the channel is enabled.
  • the FPGA determines that the TS0 time slot training sequence is enabled to be true (TRUE), and the 864chip data in the buffer area is filled into the downlink TS0 time slot, and the training sequence is sent in the designated channel of the designated carrier.
  • TRUE TS0 time slot training sequence
  • the data of all valid carriers of the TS0 slot on the specified channel provided by the IR interface is not delivered.
  • S410 The DPD of the RRU converges on the designated channel of the specified carrier, and enters an active state; wherein, if the multiple attempts cannot enter the working state, the alarm is reported.
  • the RRU software sends the TS0 time slot training sequence of the least effective carrier and the channel enable to enable.
  • Embodiment 4 provides a power calibration apparatus, which may be an RRU.
  • the apparatus includes: a filling module 52 configured to fill a pseudo carrier on a secondary carrier-free channel with a pseudo pilot; 54 is coupled to the fill module 52 and is configured to use a pseudo pilot for power calibration.
  • the primary carrier has a pilot
  • the channel having the primary carrier can be power-controlled by the pilot.
  • the secondary carrier has no pilot, and therefore, the prior art cannot Power control is performed on channels without a primary carrier.
  • a pseudo pilot for example, a SYNC_DL sequence
  • the pseudo pilot as a pilot for power control
  • power control is performed on a channel without a primary carrier.
  • the filling module 52 can adopt various implementation manners. Only one of the preferred modes is described.
  • the filling module 52 is configured to fill the pilot time slot of the first secondary carrier on the channel without the primary carrier with a dummy. Pilot.
  • the foregoing apparatus may further include: a receiving module, configured to receive a cell identifier sent by the baseband pool unit; and a generating module, coupled to the receiving module, configured to generate a pseudo pilot according to the cell identifier.
  • the pseudo pilot is generated according to the cell identifier, so that the pseudo pilot can be made. More in line with actual needs, and thus effectively perform power calibration.
  • the radio remote unit may generate a pseudo pilot according to the correspondence between the cell identifier and the pilot.
  • the foregoing apparatus may further include: a data filling module, configured to fill a time slot of the secondary carrier after filling the dummy pilot; and opening the module, coupled to the data filling module , Set to use time slot as the sampling point for digital pre-distortion.
  • a data filling module configured to fill a time slot of the secondary carrier after filling the dummy pilot
  • opening the module coupled to the data filling module , Set to use time slot as the sampling point for digital pre-distortion.
  • This embodiment achieves the opening of digital pre-distortion by filling data on time slots.
  • the time slot of the padding data may be TS0. Selecting TSOs instead of slotting data for other transport services can reduce the impact on traffic.
  • the calibration module 54 may include: a determining submodule configured to determine a power of the pseudo pilot according to the current cell configuration power; an adjustment submodule coupled to the determining submodule, configured to determine the pseudo pilot by the power factor adjustment Power; a transmit sub-module coupled to the conditioning sub-module, configured to use a pseudo-pilot power transmit pseudo pilot to perform power calibration.
  • a power calibration software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments.
  • a storage medium is provided in which the above power calibration software is stored.
  • the embodiment of the present invention adopts a method of charging a pseudo pilot on a channel without a primary carrier, and performing power calibration using the pseudo pilot, thereby achieving the effect of calibrating a channel without a primary carrier.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.

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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 appareil d'étalonnage de puissance d'étalonnage de puissance. Le procédé comprend les étapes suivantes: une unité radioélectrique éloignée remplit d'un pseudopilote des sous-porteuses de canaux dépourvus de porteuse principale; l'unité radioélectrique éloignée utilise le pseudopilote à des fins d'étalonnage de puissance. L'invention permet de résoudre le problème d'un échec de l'étalonnage de puissance sur les canaux dépourvus de porteuse principale, dans les techniques correspondantes, par la mise en oeuvre d'un étalonnage sur les canaux dépourvus de porteuse principale.
PCT/CN2012/075377 2011-09-15 2012-05-11 Procédé et appareil d'étalonnage de puissance WO2013037213A1 (fr)

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CN2011102732617A CN103002553A (zh) 2011-09-15 2011-09-15 功率校准方法及装置
CN201110273261.7 2011-09-15

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WO2013037213A1 true WO2013037213A1 (fr) 2013-03-21

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CN107508644B (zh) * 2016-06-14 2020-07-31 南京中兴软件有限责任公司 一种反馈通道在线校准方法及其装置

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CN1233141A (zh) * 1997-12-30 1999-10-27 三星电子株式会社 多频分配系统的覆盖优化方法
CN101137217A (zh) * 2007-01-30 2008-03-05 中兴通讯股份有限公司 一种组合换频切换判决方法
CN101674601A (zh) * 2009-09-28 2010-03-17 华为技术有限公司 伪导频信号处理方法和装置

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Publication number Priority date Publication date Assignee Title
US6442222B1 (en) * 1998-12-24 2002-08-27 At&T Wireless Services, Inc. Method for error compensation in an OFDM system with diversity
US7352829B2 (en) * 2004-01-12 2008-04-01 Infineon Technologies Ag Data-aided channel estimation

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Publication number Priority date Publication date Assignee Title
CN1233141A (zh) * 1997-12-30 1999-10-27 三星电子株式会社 多频分配系统的覆盖优化方法
CN101137217A (zh) * 2007-01-30 2008-03-05 中兴通讯股份有限公司 一种组合换频切换判决方法
CN101674601A (zh) * 2009-09-28 2010-03-17 华为技术有限公司 伪导频信号处理方法和装置

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