WO2017016303A1 - Procédé et appareil de précompensation d'un décalage de fréquence - Google Patents

Procédé et appareil de précompensation d'un décalage de fréquence Download PDF

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Publication number
WO2017016303A1
WO2017016303A1 PCT/CN2016/083526 CN2016083526W WO2017016303A1 WO 2017016303 A1 WO2017016303 A1 WO 2017016303A1 CN 2016083526 W CN2016083526 W CN 2016083526W WO 2017016303 A1 WO2017016303 A1 WO 2017016303A1
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WO
WIPO (PCT)
Prior art keywords
frequency offset
compensation
mobile terminal
module
pdsch
Prior art date
Application number
PCT/CN2016/083526
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English (en)
Chinese (zh)
Inventor
范毅
陈强
曹琦
Original Assignee
中兴通讯股份有限公司
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Filing date
Publication date
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Publication of WO2017016303A1 publication Critical patent/WO2017016303A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset

Definitions

  • the present invention relates to, but is not limited to, a wireless network transmission technology of a Long Term Evolution (LTE) system, and more particularly to a method and apparatus for frequency offset pre-compensation in a high-speed motion scenario of a mobile terminal.
  • LTE Long Term Evolution
  • the network scale is rapidly expanding, and LTE users in high-speed scenarios are also rapidly increasing.
  • the current speed of the high-speed rail can reach more than 350 km / h.
  • the Doppler frequency offset of the mobile terminal can reach 800 Hz or more.
  • the highest Doppler frequency offset is reachable. Above 1600Hz.
  • both the base station and the mobile terminal must estimate and correct the Doppler frequency offset by an algorithm to correctly demodulate the data.
  • the base station side its processing capability is strong, and there is no problem in frequency offset correction.
  • the mobile terminal side due to the processing capability of the mobile terminal, there may be cases where frequency offset estimation and frequency offset correction cannot be performed, resulting in easy off-network. Or the experience is very poor.
  • the embodiments of the present invention are directed to a frequency offset pre-compensation method and apparatus, which can perform Doppler frequency offset compensation in a high-speed scene of a mobile terminal.
  • the embodiment of the invention provides a frequency offset pre-compensation method, and the method includes:
  • the base station transmission mode When it is confirmed that the mobile terminal is in a high speed scenario, configure the base station transmission mode to be TM8;
  • RS downlink dedicated reference signal
  • PDSCH physical downlink shared channel
  • the downlink dedicated RS and PDSCH signals after the frequency offset pre-compensation are transmitted to the mobile terminal.
  • the confirming that the mobile terminal is in a high speed scenario includes:
  • the configuring the base station transmission mode to be TM8 includes:
  • the base station transmission mode is set to TM8 by sending an RRC Connection Reconfiguration message.
  • the performing frequency offset pre-compensation for the downlink dedicated RS and the PDSCH includes:
  • the method further includes:
  • the embodiment of the present invention further provides a frequency offset pre-compensation device, where the device includes: an acknowledgment module, a transmission mode configuration module, a frequency offset pre-compensation module, and a sending module, where
  • the confirmation module is configured to confirm whether the mobile terminal is in a high speed scene
  • the transmission mode configuration module is configured to configure the base station transmission mode to be TM8 when it is confirmed that the mobile terminal is in a high speed scenario
  • the frequency offset pre-compensation module is configured to perform frequency offset pre-compensation on a downlink dedicated reference signal (RS) and a physical downlink shared channel (PDSCH) signal;
  • RS downlink dedicated reference signal
  • PDSCH physical downlink shared channel
  • the transmitting module is configured to send a downlink dedicated RS and a PDSCH signal that are subjected to frequency offset pre-compensation to the mobile terminal.
  • the confirmation module is set to:
  • the transmission mode configuration module is configured to: configure the base station transmission mode to be TM8 by sending an RRC Connection Reconfiguration message.
  • the frequency offset pre-compensation module is set to:
  • the embodiment of the invention further provides a mobile terminal, including:
  • a receiving module configured to receive the downlink dedicated RS and PDSCH signals after performing frequency offset pre-compensation
  • the signal processing module is configured to perform channel estimation according to the downlink dedicated RS after the frequency offset pre-compensation, and demodulate the PDSCH signal after the frequency offset pre-compensation.
  • the frequency offset pre-compensation method and device when confirming that the mobile terminal is in a high-speed scenario, configuring the base station transmission mode to be TM8; and performing frequency on the downlink dedicated reference signal (RS) and the physical downlink shared channel (PDSCH) signal Offset pre-compensation; transmitting the downlink dedicated RS and PDSCH signals subjected to the frequency offset pre-compensation to the mobile terminal.
  • the base station performs frequency offset compensation on the PDSCH signal in advance, thereby reducing the requirement for the frequency offset demodulation capability in the high-speed scene of the mobile terminal, avoiding the occurrence of the off-network phenomenon, and improving the user experience.
  • FIG. 1 is a schematic flow chart of a frequency offset pre-compensation method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a second frequency offset pre-compensation method according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a frequency offset pre-compensation device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.
  • the downlink channel estimation by the mobile terminal mainly relies on the downlink reference signal (RS, Reference Signals) from the base station, and the downlink RS of the base station is applicable to the entire cell, and cannot be processed for a single mobile terminal.
  • RS downlink reference signal
  • frequency offset pre-compensation needs to be performed based on the downlink dedicated RS: when the base station confirms that the mobile terminal is in a high-speed scenario, the base station transmission mode is configured as TM8; and the base station performs frequency offset pre-compensation on the downlink dedicated RS and the PDSCH signal; And transmitting the downlink dedicated RS and PDSCH signals that are subjected to frequency offset pre-compensation to the mobile terminal.
  • the Doppler frequency offset of the downlink dedicated RS and PDSCH signals received by the mobile terminal is small or there is no Doppler frequency offset.
  • FIG. 1 is a schematic flowchart of a frequency offset pre-compensation method according to an embodiment of the present invention. As shown in FIG. 1 , the frequency offset pre-compensation method in this embodiment includes the following steps:
  • Step 101 The base station configures the base station transmission mode to be TM8 when it is confirmed that the mobile terminal is in a high speed scenario
  • the determining, by the base station, that the mobile terminal is in a high-speed scenario comprises: the base station estimating a Doppler frequency offset of the received uplink signal from the mobile terminal; and when the Doppler frequency offset of the uplink signal is higher than a preset threshold , the base station confirms that the mobile terminal is in a high speed scenario;
  • the preset threshold may be set according to actual requirements, such as setting the maximum value of the Doppler frequency offset that most mobile terminals can bear or process as the base station side without leaving the network or affecting the user experience.
  • the preset threshold is not specifically limited in the embodiment of the present invention, and any formally determined preset threshold belongs to the protection scope of the present invention.
  • the configuring the mobile terminal to transmit the mode to the TM8 includes: the base station, by transmitting a radio resource control connection reconfiguration message (RRC Connection Reconfiguration) message, configuring the mobile terminal to transmit the mode to the TM8; wherein the TM8 mode is the dual stream Beamforming mode.
  • RRC Connection Reconfiguration radio resource control connection reconfiguration message
  • Step 102 The base station performs frequency offset pre-compensation on the downlink dedicated reference signal (RS) and the physical downlink shared channel (PDSCH) signal.
  • RS downlink dedicated reference signal
  • PDSCH physical downlink shared channel
  • Performing frequency offset pre-compensation for the downlink dedicated RS and the PDSCH by the base station includes: the base station real-time estimation of the received Doppler frequency offset of the uplink signal from the mobile terminal, according to the Doppler frequency offset of the uplink signal,
  • the downlink dedicated RS and PDSCH signals are subjected to frequency offset pre-compensation.
  • Step 103 The base station sends the downlink dedicated RS and PDSCH signals that are subjected to frequency offset pre-compensation to the mobile terminal.
  • the mobile terminal after receiving the downlink dedicated RS and the PDSCH signal after the frequency offset pre-compensation, the mobile terminal performs channel estimation according to the downlink dedicated RS that performs the frequency offset pre-compensation, and demodulates the performing. Pre-compensated PDSCH signal with frequency offset.
  • the frequency offset pre-compensation method according to the embodiment of the present invention includes the following steps:
  • Step 201 The mobile terminal initiates a service.
  • the high-speed mobile LTE mobile terminal in this step initiates a service according to a normal process, and sends an uplink signal to the base station;
  • Step 202 The base station estimates a Doppler frequency offset of the uplink signal sent by the mobile terminal.
  • Step 203 Determine whether the Doppler frequency offset of the uplink signal of the mobile terminal is higher than a preset threshold. When the Doppler frequency offset of the uplink signal of the mobile terminal is higher than a preset threshold, it is considered to be moving at this time. If the terminal is in a high-speed moving scenario, step 204 is performed; when the Doppler frequency offset of the uplink signal of the mobile terminal is not higher than a preset threshold, step 210 is performed, and the process ends;
  • the preset threshold may be set according to actual requirements, such as setting the maximum value of the Doppler frequency offset that most mobile terminals can bear or process as the base station side without leaving the network or affecting the user experience. Preset threshold.
  • Step 204 The base station sends an RRC Connection Reconfiguration message, and configures the base station transmission mode to be TM8.
  • the TM8 mode is a dual stream Beamforming mode.
  • Step 205 The base station estimates a Doppler frequency offset of the uplink signal in real time.
  • Step 206 The base station performs frequency offset pre-compensation on the downlink dedicated RS and the PDSCH according to the Doppler frequency offset of the uplink signal.
  • Step 207 The base station sends the downlink dedicated RS and the PDSCH after the frequency offset pre-compensation to the mobile terminal.
  • Step 208 The mobile terminal receives the downlink dedicated RS and PDSCH signals after performing frequency offset pre-compensation;
  • Step 209 The mobile terminal performs channel estimation according to the downlink dedicated RS, and demodulates the PDSCH signal after performing frequency offset pre-compensation;
  • Step 210 The process ends.
  • FIG. 3 is a schematic structural diagram of a frequency offset pre-compensation device according to an embodiment of the present invention. As shown in FIG. 3, the device includes a confirmation module 31. a transmission mode configuration module 32, a frequency offset pre-compensation module 33, and a transmitting module 34, wherein
  • the confirmation module 31 is configured to confirm whether the mobile terminal is in a high speed scene
  • the confirmation module 31 is configured to: estimate a Doppler frequency offset of the received uplink signal from the mobile terminal; when the Doppler frequency offset of the uplink signal is higher than a preset threshold, Then confirm that the mobile terminal is in a high speed scene.
  • the preset threshold may be set according to actual requirements, such as setting the maximum value of the Doppler frequency offset that most mobile terminals can bear or process as the base station side without leaving the network or affecting the user experience.
  • the preset threshold is not specifically limited in the embodiment of the present invention, and any formally determined preset threshold belongs to the protection scope of the present invention.
  • the transmission mode configuration module 32 is configured to configure the base station transmission mode to be TM8 when it is confirmed that the mobile terminal is in a high speed scenario;
  • the transmission mode configuration module 32 is configured to: configure the base station transmission mode to be TM8 by sending an RRC Connection Reconfiguration message; wherein the TM8 mode is a dual-stream Beamforming mode.
  • the frequency offset pre-compensation module 33 is configured to perform frequency offset pre-compensation on a downlink dedicated reference signal (RS) and a physical downlink shared channel (PDSCH) signal;
  • RS downlink dedicated reference signal
  • PDSCH physical downlink shared channel
  • the frequency offset pre-compensation module 33 is configured to: receive real-time estimation Doppler frequency offset of the uplink signal from the mobile terminal; performing frequency offset pre-compensation on the downlink dedicated RS and PDSCH signals according to the Doppler frequency offset of the uplink signal.
  • the sending module 34 is configured to send the downlink dedicated RS and PDSCH signals after performing frequency offset pre-compensation to the mobile terminal.
  • the embodiment of the present invention further provides a mobile terminal.
  • the mobile terminal includes a receiving module, and a signal processing module.
  • the receiving module is configured to receive the downlink dedicated RS and PDSCH signals after performing frequency offset pre-compensation;
  • the signal processing module is configured to perform channel estimation according to the downlink dedicated RS after performing frequency offset pre-compensation, and demodulate the PDSCH signal after performing frequency offset pre-compensation.
  • each processing module in the frequency offset precompensation device shown in FIG. 3 can be understood by referring to the related description of the frequency offset precompensation method. It should be understood by those skilled in the art that the function of each processing module in the frequency offset precompensation device shown in FIG. 3 can be implemented by a program running on a processor, or can be implemented by a specific logic circuit, for example, can be centrally Processor (CPU), microprocessor (MPU), digital signal processor (DSP), or field programmable gate array (FPGA) implementation.
  • CPU centrally Processor
  • MPU microprocessor
  • DSP digital signal processor
  • FPGA field programmable gate array
  • the disclosed method and apparatus may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the modules is only a logical function division.
  • there may be another division manner for example, multiple modules or components may be combined, or Can be integrated into another system, or some features can be ignored or not executed.
  • the communication connections between the various components shown or discussed may be indirect coupling or communication connections through some interfaces, devices or modules, and may be electrical, mechanical or otherwise.
  • the modules described above as separate components may or may not be physically separated.
  • the components displayed as modules may or may not be physical modules, that is, may be located in one place or distributed to multiple network modules; Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional module in each embodiment of the present invention may be integrated into one processing module.
  • each module may be separately used as one module, or two or more modules may be integrated into one module; the integrated module may be implemented in the form of hardware or in the form of hardware plus software function modules. achieve.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The foregoing steps of the method embodiment; and the foregoing storage medium includes: a removable storage device, a read-only memory (ROM), a magnetic disk or an optical disk, and the like, which can store a program code.
  • ROM read-only memory
  • the above-described integrated module of the embodiment of the present invention may be stored in a computer readable storage medium if it is implemented in the form of a software function module and sold or used as a stand-alone product.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in each embodiment of the present invention.
  • the foregoing storage medium includes: a plurality of media that can store program codes, such as a mobile storage device, a ROM, a magnetic disk, or an optical disk.
  • the present invention is an example of the frequency offset pre-compensation method and apparatus described in the examples, but the above embodiments are taken as an example, but the invention is not limited thereto, and those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be performed. Modifications, or equivalents to some or all of the technical features, and the modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present invention.
  • the foregoing technical solution can reduce the requirement of the frequency offset demodulation capability in the high-speed scene of the mobile terminal, avoid the occurrence of the off-network phenomenon, and improve the user experience.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de précompensation d'un décalage de fréquence. Le procédé comprend : lorsqu'il est confirmé qu'un terminal mobile est dans un scénario à haute vitesse, la configuration d'un mode de transmission de station de base sur TM8 ; la réalisation d'une précompensation de décalage de fréquence sur un signal de référence (RS) dédié de liaison descendante et sur un signal de canal partagé de liaison descendante physique (PDSCH) ; et l'envoi au terminal mobile du RS dédié de liaison descendante ainsi que du signal de PDSCH après la précompensation de décalage de fréquence.
PCT/CN2016/083526 2015-07-29 2016-05-26 Procédé et appareil de précompensation d'un décalage de fréquence WO2017016303A1 (fr)

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CN201510454132.6A CN106411800B (zh) 2015-07-29 2015-07-29 一种频偏预补偿方法及装置
CN201510454132.6 2015-07-29

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CN113055995A (zh) * 2019-12-26 2021-06-29 中兴通讯股份有限公司 频偏估计方法和装置
CN113364714A (zh) * 2020-03-05 2021-09-07 大唐移动通信设备有限公司 频率补偿方法、装置、网络侧设备、终端及存储介质
CN114391243A (zh) * 2020-08-05 2022-04-22 北京小米移动软件有限公司 频偏补偿、校准方法及装置、存储介质
CN116723074A (zh) * 2023-08-10 2023-09-08 北京智芯微电子科技有限公司 下行同步方法、装置、设备、芯片及可读存储介质

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CN111698064B (zh) * 2019-03-14 2023-06-30 中国移动通信有限公司研究院 增强解调参考信号的发送方法及装置、设备、介质
WO2021128026A1 (fr) * 2019-12-24 2021-07-01 华为技术有限公司 Procédé d'envoi d'informations, procédé de réception d'informations et appareil
CN114520984A (zh) * 2020-11-20 2022-05-20 中国移动通信有限公司研究院 一种传输处理方法、装置及设备

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CN113055995A (zh) * 2019-12-26 2021-06-29 中兴通讯股份有限公司 频偏估计方法和装置
CN113055995B (zh) * 2019-12-26 2023-10-27 中兴通讯股份有限公司 频偏估计方法和装置
CN113364714A (zh) * 2020-03-05 2021-09-07 大唐移动通信设备有限公司 频率补偿方法、装置、网络侧设备、终端及存储介质
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CN114391243A (zh) * 2020-08-05 2022-04-22 北京小米移动软件有限公司 频偏补偿、校准方法及装置、存储介质
CN116723074A (zh) * 2023-08-10 2023-09-08 北京智芯微电子科技有限公司 下行同步方法、装置、设备、芯片及可读存储介质
CN116723074B (zh) * 2023-08-10 2023-10-27 北京智芯微电子科技有限公司 下行同步方法、装置、设备、芯片及可读存储介质

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