WO2009143691A1 - Procédé de compensation du décalage de fréquence, dispositif et système s'y rapportant - Google Patents

Procédé de compensation du décalage de fréquence, dispositif et système s'y rapportant Download PDF

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Publication number
WO2009143691A1
WO2009143691A1 PCT/CN2009/000339 CN2009000339W WO2009143691A1 WO 2009143691 A1 WO2009143691 A1 WO 2009143691A1 CN 2009000339 W CN2009000339 W CN 2009000339W WO 2009143691 A1 WO2009143691 A1 WO 2009143691A1
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WO
WIPO (PCT)
Prior art keywords
frequency
user equipment
base station
uplink signal
frequency offset
Prior art date
Application number
PCT/CN2009/000339
Other languages
English (en)
Chinese (zh)
Inventor
刘之浩
芮鹤龄
孟忻
Original Assignee
中国移动通信集团上海有限公司
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 中国移动通信集团上海有限公司 filed Critical 中国移动通信集团上海有限公司
Publication of WO2009143691A1 publication Critical patent/WO2009143691A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device and system for frequency offset compensation. Background technique
  • the frequency of the transmitting information received by the receiving body is different from the frequency of transmitting information by the transmitting source. This phenomenon is called the Doppler effect, and the difference between the receiving frequency and the transmitting frequency. It is called Doppler shift.
  • the Doppler frequency offset of the receiver receiving signal is: Af ⁇ f cosWc, f is the frequency when the receiver receives the signal, and indicates the angle between the line connecting the receiver and the source and the moving direction of the receiver. , c is the speed of light.
  • the existing terminal adopts an automatic frequency control (AFC) frequency control scheme to combat the frequency offset, that is, the terminal estimates or decreases the average frequency offset value according to the detected data symbols, and accordingly increases or decreases the local oscillator frequency.
  • AFC automatic frequency control
  • a high-speed mobile environment such as a vehicle speed of 400Km/h or more
  • the terminal In order to improve the performance of the terminal in a high-speed environment, it may be considered to reduce the period of the AFC and increase the step size, so that when the terminal encounters a large frequency offset, the local oscillator frequency of the terminal can track the receiving frequency faster, but For smaller AFC cycles and larger adjustment step settings, for slower or static scenes, the local oscillator frequency jitter of the terminal is too large, which will affect its performance. It can be seen that the AFC scheme is used to combat the frequency offset, and the terminal has limited ability to control the frequency. At present, the ideal frequency control effect cannot be achieved, affecting the transmission of service data, and even business interruption may occur. Summary of the invention
  • Embodiments of the present invention provide a method, device, and system for frequency offset compensation, which are used to effectively implement frequency control and ensure service continuity.
  • An embodiment of the present invention provides a method for frequency offset compensation, including:
  • Determining a frequency to be used for the downlink signal transmitted to the user equipment according to the specified frequency of transmitting the downlink signal to the user equipment and the frequency offset.
  • An embodiment of the present invention provides an apparatus for frequency offset compensation, including:
  • An interface module configured to determine an actual frequency of the uplink signal sent by the user equipment, where the first calculation module is configured to determine, according to the specified frequency of the uplink signal sent by the user equipment, and the actual frequency determined by the interface module, The frequency offset of the uplink signal;
  • a second calculating module configured to determine, according to a specified frequency and a frequency offset of the downlink signal sent to the user equipment, a frequency that should be adopted for the downlink signal sent to the user equipment.
  • An embodiment of the present invention provides a system for frequency offset compensation, including:
  • User equipment configured to send an uplink signal on a specified frequency
  • the first base station is configured to obtain an actual frequency of the uplink signal sent by the user equipment, determine a frequency offset of the uplink signal according to the specified frequency, and the obtained actual frequency, and send the frequency offset to the user equipment according to the A predetermined frequency of the downlink signal and the frequency offset determine a frequency to which the downlink signal transmitted to the user equipment should be used.
  • An embodiment of the present invention provides a system for frequency offset compensation, including:
  • User equipment configured to send an uplink signal on a specified frequency
  • a first base station configured to determine an actual frequency of the uplink signal sent by the received user equipment, determining, according to the specified frequency and the determined actual frequency, a frequency offset of the received uplink signal, and when When the user equipment completes the handover between the network elements on the network side, the frequency offset is sent to the second Base station
  • the second base station is configured to determine, according to a specified frequency of transmitting the downlink signal to the user equipment, and the frequency offset, a frequency that should be adopted for the downlink signal sent to the user equipment.
  • the frequency offset is determined by the received uplink signal sent by the user equipment, and the frequency offset that may occur in the downlink signal sent to the user equipment is compensated accordingly. This method is fast and efficient enough to ensure business continuity.
  • FIG. 1 is a flow chart of a main method for frequency offset in an embodiment of the present invention
  • FIG. 3 is a structural diagram of a device in an embodiment of the present invention.
  • FIG. 4 is a structural diagram of a B3G system according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of a 3G system according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of a detailed method in a B3G system according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a detailed method in a 3G system according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a frame structure of a RACH according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a frame structure of a FACH according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a frame of an uplink DCH according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a frame of a downlink DCH according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of frequency offset in an embodiment of the present invention. detailed description
  • the network side calculates the frequency offset according to the received uplink signal sent by the user equipment, so as to compensate the downlink signal sent to the user equipment, and quickly and effectively compensate the frequency offset to satisfy the user's transmission. Quality requirements.
  • the main method of frequency offset compensation in this embodiment is as follows:
  • Step 101 Determine an actual frequency of the uplink signal sent by the received user equipment.
  • Step 102 Determine a frequency offset of the received uplink signal according to the specified frequency of the uplink signal sent by the user equipment and the determined actual frequency.
  • the specified frequency is the frequency used by the designated user side on the network side.
  • Step 103 Determine a frequency to be used for the downlink signal sent to the user equipment according to the specified frequency of the downlink signal sent to the user equipment and the frequency offset.
  • Step 201 Receive an uplink signal sent by the user equipment.
  • Step 202 Determine an actual frequency of the plurality of data frames in the received uplink signal, where the multiple data frames may be continuous or discrete.
  • Step 203 Determine an average value fim of actual frequencies of the plurality of data frames.
  • steps 202 and 203 only the actual frequency of one data frame in the uplink signal (especially the actual frequency of the last data frame) may be determined, and the average value mode is not used, so that the frequency offset obtained in the subsequent step is instantaneous. better.
  • the stability of the frequency offset is determined according to the average value. The following is an example of an average value.
  • Step 205 Determine to send the specified frequency fdp of the downlink signal to the user equipment.
  • the specified frequencies are known in Time Division Duplex (TDD) and Frequency Division Duplex (FDD) systems.
  • a downlink signal is sent to the user equipment according to the frequency fda that should be used for the determination.
  • fda fdp - A f
  • This ⁇ can make the frequency offset compensation more flexible and accurate, because if the moving speed of the user equipment changes rapidly, The frequency offset determined according to the received uplink signal must be biased when applied to the downlink transmission. It can be well controlled by ⁇ .
  • the specific value can be related to various factors, such as the moving direction of the user equipment, the signal transmission direction and the moving speed. For example, when speeding up, you can set "Set to greater than 1 and when decelerating, you can set" to less than 1.
  • the present embodiment provides an apparatus for implementing frequency offset compensation, which includes an interface module 301, a first calculation module 302, and a second calculation module 303.
  • the device may be specifically a base station (Node B) or an evolved base station (Evolved Node B, eNB).
  • the interface module 301 is configured to determine an actual frequency of the uplink signal sent by the received user equipment.
  • the interface module 301 is specifically configured to determine only the actual frequency of one data frame (especially the actual frequency of the last data frame) of the received uplink signal as the actual frequency of the uplink signal, or determine multiple data in the received uplink signal.
  • the average of the actual frequencies of the frames is the actual frequency of the upstream signals.
  • the first calculating module 302 is configured to determine a frequency offset of the received uplink signal according to the specified frequency of the uplink signal sent by the user equipment and the actual frequency determined by the interface module 301.
  • the first calculation module 302 is specifically configured to determine the difference between the determined actual frequency and the specified frequency at which the user equipment sends the uplink signal as the frequency offset.
  • the second calculating module 303 is configured to determine a frequency to be used for the downlink signal sent to the user equipment according to the specified frequency and the frequency offset of the downlink signal sent to the user equipment.
  • the second calculation module 303 includes a first calculation unit and a second calculation unit.
  • the first calculating unit is configured to determine, when the user equipment does not perform the network side network element switching or the network side network element switching, the difference between the specified frequency and the frequency offset of the downlink signal sent to the user equipment is determined to be the user The frequency at which the downstream signal sent by the device should be used.
  • the second calculating unit is configured to: when the user equipment is switched between the network side network elements, the sum of the specified frequency and the frequency offset of the downlink signal sent to the user equipment is determined as the downlink sent to the user equipment. The frequency at which the signal should be used.
  • the apparatus for implementing the frequency offset compensation provided by the embodiment further includes a sending module 304, configured to send a downlink signal to the user equipment according to the frequency that should be adopted by the second calculating module 303.
  • the apparatus for implementing the frequency offset compensation provided by the embodiment further includes a sending indication module 305, configured to send the frequency that should be adopted by the second calculating module 303 to the target cell base station to which the user equipment is to be handed over, indicating the target The cell base station sends a downlink signal to the user equipment according to the frequency.
  • a sending indication module 305 configured to send the frequency that should be adopted by the second calculating module 303 to the target cell base station to which the user equipment is to be handed over, indicating the target The cell base station sends a downlink signal to the user equipment according to the frequency.
  • the process of frequency offset compensation is different when the user equipment switches between network elements on the network side.
  • two systems are introduced.
  • a system of a radio network controller (R C ) is not included in this embodiment, which includes a user equipment and an evolved base station.
  • the user equipment is used to transmit an uplink signal on a certain frequency.
  • the source evolved base station is configured to receive an uplink signal sent by the user equipment, determine an actual frequency of the received uplink signal, and determine, according to the specified frequency of the uplink signal sent by the user equipment, and the determined actual frequency, determining that the received uplink signal occurs. Frequency offset, and determining a frequency to which the downlink signal transmitted to the user equipment should be used according to a predetermined frequency and a frequency offset for transmitting the downlink signal to the user equipment.
  • the source evolved base station sends the downlink signal sent by the user equipment to the target evolved base station.
  • the target evolved base station is configured to send a downlink signal to the user equipment according to a frequency that should be adopted by the downlink signal sent to the user equipment.
  • the source evolved base station and the target evolved base station each include an interface for directly transmitting a frequency that the downlink signal should be used between the evolved base station and the evolved base station.
  • the source evolved base station is configured to receive an uplink signal sent by the user equipment and determine an actual frequency of the received uplink signal, and when the user equipment completes the handover between the network side network elements, send the determined actual frequency of the uplink signal to the target evolution.
  • Base station The target evolved base station is configured to determine, according to the specified frequency of the uplink signal sent by the user equipment, the frequency offset generated by the uplink signal, and determine, according to the specified frequency and the frequency offset, the downlink signal is sent to the user equipment, The frequency at which the user equipment should transmit the downlink signal.
  • the source evolved base station is configured to receive the uplink signal sent by the user equipment, determine the actual frequency of the received uplink signal, and determine the frequency of the received uplink signal according to the specified frequency of the uplink signal sent by the user equipment and the determined actual frequency.
  • the frequency offset is sent to the target evolved base station.
  • the target evolved base station is configured to determine, according to a specified frequency and a frequency offset of the downlink signal sent to the user equipment, a frequency to be used for the downlink signal sent to the user equipment.
  • a system including an RNC in this embodiment includes a user equipment, a base station, and an RNC.
  • the user equipment is used to transmit an uplink signal on a certain frequency.
  • the source base station is configured to receive an uplink signal sent by the user equipment, determine an actual frequency of the received uplink signal, and determine a frequency offset of the uplink signal according to the specified frequency of the uplink signal sent by the user equipment and the determined actual frequency, and Determining a frequency to which the downlink signal transmitted to the user equipment should be used according to a predetermined frequency for transmitting the downlink signal to the user equipment and the frequency offset.
  • the frequency to be determined should be sent to the RNC.
  • the RNC is configured to forward the frequency to be determined by the source base station to the target base station when the user equipment completes the handover between the network elements on the network side.
  • the target base station is configured to send a downlink signal to the user equipment according to the frequency that should be used.
  • the source base station is configured to receive the uplink signal sent by the user equipment and determine the actual frequency of the received uplink signal.
  • the actual frequency of the determined uplink signal is sent to the RNC through the RNC.
  • Target base station is configured to determine, according to the specified frequency of the uplink signal sent by the user equipment, the frequency offset of the uplink signal, and determine the frequency to the user equipment according to the specified frequency and the frequency offset of the downlink signal sent to the user equipment. The frequency at which the transmitted downlink signal should be used.
  • the source base station is configured to receive an uplink signal sent by the user equipment, and determine an actual frequency of the received uplink signal, and determine a frequency offset of the uplink signal according to the specified frequency of the uplink signal sent by the user equipment and the actual frequency, when the user equipment When the handover between the network elements on the network side is completed, the frequency offset is sent to the target base station through the RNC.
  • the target base station is configured to determine a frequency to be used for the downlink signal sent to the user equipment according to the specified frequency of transmitting the downlink signal to the user equipment and the frequency offset. The following describes the frequency offset compensation process when the user equipment is switched between network elements on the network side for the two systems.
  • Step 601 The user equipment sends a measurement report to the source eNB.
  • Step 602 The source eNB receives the measurement report sent by the user equipment at an actual frequency.
  • Step 603 The source eNB determines, according to the measurement report, that the user equipment needs to switch to another cell.
  • Step 605 The source eNB determines the actual frequency that the user equipment should use to send the downlink signal according to the specified frequency and frequency offset of the downlink signal sent to the user equipment.
  • Step 606 The source eNB sends a connection request for cell handover to the target eNB, and carries the actual frequency that the downlink signal sent to the user equipment should be used.
  • the target eNB adopts the downlink actual frequency at least when transmitting the downlink signal to the user equipment for the first time.
  • steps 604-605 are independent of step 603, and there is no strict execution order between them.
  • the source eNB may send the frequency offset to the target eNB, and the target eNB completes the operations performed in step 605.
  • Step 701 The user equipment sends a measurement report to the source base station.
  • Step 702 The source base station receives the measurement report sent by the user equipment at an actual frequency.
  • Step 703 The source base station determines the frequency offset according to the actual frequency of the received uplink signal and a predetermined frequency of the uplink signal sent by the user equipment.
  • Step 704 The source base station determines an actual frequency to be used for the downlink signal sent to the user equipment according to the specified frequency and frequency offset of the downlink signal sent to the user equipment.
  • Step 706 The RNC determines that the user equipment needs to switch to another cell according to the measurement report.
  • Step 707 The R C sends a connection request of the cell handover to the target base station, and carries the actual frequency that should be used in the downlink.
  • the target base station adopts the downlink actual frequency at least when transmitting the downlink signal to the user equipment for the first time.
  • the function performed by the source base station in step 704 can also be implemented by the RNC or the target base station, and the source base station only needs to carry the frequency offset in the measurement report.
  • the measurement report is sent to the RNC through the FP frame.
  • FP frames such as RACH, FACH, uplink DCH, and downlink DCH.
  • the specific structure is shown in Figure 8 - Figure 11.
  • the idle field in the FP frame can be used for transmission.
  • the information related to the frequency offset may carry the actual frequency of the uplink or the frequency to be used in the downlink, and may also carry the frequency offset.
  • the number of bits occupied by the information related to the frequency offset may be determined according to the actual application.
  • 12 is an example of a structure of a frequency offset information field.
  • the frequency offset information field is composed of two bytes. In this embodiment, 13 bits are used to indicate a frequency offset, which can represent a range of 0 - 8191.
  • 0-4094 indicates that the frequency offset is Negative numbers, from -4095 Hz to -1 ⁇ , 4095 indicates that the frequency offset is 0, 4096-8191 indicates that the frequency offset is positive, from 1 Hz to 4096 Hz; the other 5 bits are reserved as reserved bits.
  • the software for implementing the embodiments of the present invention can be stored in a storage medium such as a floppy disk, a hard disk, an optical disk, and a flash memory.
  • the frequency offset is determined by the received uplink signal sent by the user equipment, and the frequency offset that may occur in the downlink signal sent to the user equipment is compensated accordingly.
  • the method is fast and effective, especially for scenarios where the user equipment moves at high speed (e.g., 120 km/h).
  • the embodiment of the present invention further improves the transmission quality by making finer adjustments to the frequency offset.
  • the embodiment of the present invention provides a solution for the user equipment not switching between the network side network elements and the network side network element switching process, so that the embodiment of the present invention is also applicable in the cell handover process.

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

Abstract

On propose un procédé de compensation du décalage de fréquence pour améliorer la qualité du signal de transmission et garantir ainsi la continuité du service pour le haut débit. Ledit procédé consiste à: déterminer la fréquence réelle du signal de liaison montante reçu par l'équipement utilisateur; déterminer le décalage de fréquence généré en fonction de ladite fréquence réelle du signal de liaison montante envoyé par l'équipement utilisateur et de la fréquence requise dudit signal; déterminer le décalage de fréquence du signal de liaison descendante acheminé vers ledit équipement utilisateur en fonction de la fréquence requise et dudit décalage de fréquence. Un dispositif et un système pour mettre en oeuvre la présente méthode sont aussi proposés.
PCT/CN2009/000339 2008-05-29 2009-03-30 Procédé de compensation du décalage de fréquence, dispositif et système s'y rapportant WO2009143691A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA2008101135496A CN101594179A (zh) 2008-05-29 2008-05-29 一种频偏补偿的方法、装置及系统
CN200810113549.6 2008-05-29

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WO2009143691A1 true WO2009143691A1 (fr) 2009-12-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102957461B (zh) * 2011-08-22 2015-06-17 鼎桥通信技术有限公司 下行信号发送方法及无线通信系统
CN103067988B (zh) * 2013-01-11 2016-04-06 京信通信系统（中国）有限公司 一种提高切换成功率的方法及装置
CN104079510B (zh) * 2013-03-29 2017-05-24 上海贝尔股份有限公司 一种在用户设备切换小区时进行频偏估计的方法与设备
CN110740504A (zh) * 2015-03-09 2020-01-31 华为技术有限公司 一种数据传输设备、方法及系统
CN109005135B (zh) * 2017-06-06 2022-06-17 中兴通讯股份有限公司 一种处理通信系统上行链路频偏的方法与装置

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CN1389039A (zh) * 2000-08-25 2003-01-01 松下电器产业株式会社 基站装置、通信终端装置及通信方法
CN1439203A (zh) * 2000-06-26 2003-08-27 摩托罗拉公司 机载蜂窝系统的多普勒校正
US20040248519A1 (en) * 2003-05-19 2004-12-09 Kari Niemela Data transmission method, system and network element
WO2007068001A2 (fr) * 2005-12-09 2007-06-14 Neocific, Inc. Correction de frequence dans un systeme de communication multiporteuse

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Publication number Priority date Publication date Assignee Title
CN1439203A (zh) * 2000-06-26 2003-08-27 摩托罗拉公司 机载蜂窝系统的多普勒校正
CN1389039A (zh) * 2000-08-25 2003-01-01 松下电器产业株式会社 基站装置、通信终端装置及通信方法
US20040248519A1 (en) * 2003-05-19 2004-12-09 Kari Niemela Data transmission method, system and network element
WO2007068001A2 (fr) * 2005-12-09 2007-06-14 Neocific, Inc. Correction de frequence dans un systeme de communication multiporteuse

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