CN106411800B - Frequency offset precompensation method and device - Google Patents
Frequency offset precompensation method and device Download PDFInfo
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- CN106411800B CN106411800B CN201510454132.6A CN201510454132A CN106411800B CN 106411800 B CN106411800 B CN 106411800B CN 201510454132 A CN201510454132 A CN 201510454132A CN 106411800 B CN106411800 B CN 106411800B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
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- 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
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- 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
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- 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
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- 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
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Abstract
The invention provides a frequency offset precompensation method, which is characterized by comprising the following steps: when the mobile terminal is confirmed to be in a high-speed scene, configuring the transmission mode of the base station as TM 8; performing frequency offset pre-compensation on a downlink dedicated Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal; and sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal. The invention also provides a frequency deviation precompensation device.
Description
Technical Field
The invention relates to a wireless network transmission technology of a Long Term Evolution (LTE) system, in particular to a frequency offset pre-compensation method and device under a high-speed motion scene of a mobile terminal.
Background
With the continuous maturity and perfection of the LTE technology and the mobile terminal industry chain, the network scale is rapidly expanding, and LTE users in a high-speed scene are also rapidly increasing. For example, the current high-speed rail speed per hour can reach more than 350 km/h, in the high-speed scene, the doppler frequency offset of the mobile terminal can reach more than 800Hz, and for an area overlapped by two cells, the highest doppler frequency offset can reach more than 1600 Hz.
In a high-speed scene, both the base station and the mobile terminal must estimate and correct the doppler frequency offset through an algorithm to correctly demodulate data. For the base station side, the processing capability is strong, and there is no problem in the frequency offset correction, but for the mobile terminal side, the processing capability of the mobile terminal is limited, and there may be a case that the frequency offset estimation and the frequency offset correction cannot be performed, thereby causing easy network disconnection or poor experience.
Disclosure of Invention
In view of this, embodiments of the present invention are expected to provide a frequency offset pre-compensation method and apparatus, which can solve the problem that doppler frequency offset compensation cannot be performed in a high-speed scene of a mobile terminal.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a frequency offset precompensation method, which comprises the following steps:
when the mobile terminal is confirmed to be in a high-speed scene, configuring the transmission mode of the base station as TM 8;
performing frequency offset pre-compensation on a downlink dedicated Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal;
and sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal.
In the foregoing solution, the determining that the mobile terminal is in the high-speed scene includes:
estimating Doppler frequency offset of an uplink signal received from a mobile terminal;
and when the Doppler frequency offset of the uplink signal is higher than a preset threshold value, confirming that the mobile terminal is in a high-speed scene.
In the foregoing solution, the configuring the base station transmission mode as TM8 includes:
the base station transmission mode is configured to TM8 by sending an RRC Connection Reconfiguration message.
In the above scheme, the performing frequency offset pre-compensation on the downlink dedicated RS and PDSCH includes:
estimating Doppler frequency offset of an uplink signal received from a mobile terminal;
and performing frequency offset pre-compensation on the downlink special RS and PDSCH signals according to the Doppler frequency offset of the uplink signals.
In the above scheme, the method further comprises:
the mobile terminal receives the downlink special RS and PDSCH signals after the frequency offset pre-compensation;
and performing channel estimation according to the downlink special RS subjected to frequency offset precompensation, and demodulating the PDSCH signal subjected to frequency offset precompensation.
The embodiment of the invention also provides a frequency offset precompensation device, which comprises: a confirming module, a transmission mode configuration module, a frequency deviation precompensation module and a sending module, wherein,
the confirming module is used for confirming whether the mobile terminal is in a high-speed scene;
the transmission mode configuration module is used for configuring a base station transmission mode as TM8 when the mobile terminal is confirmed to be in a high-speed scene;
the frequency offset pre-compensation module is used for carrying out frequency offset pre-compensation on a downlink dedicated Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal;
and the sending module is used for sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal.
In the foregoing solution, the confirmation module is specifically configured to:
estimating Doppler frequency offset of an uplink signal received from a mobile terminal;
and when the Doppler frequency offset of the uplink signal is higher than a preset threshold value, confirming that the mobile terminal is in a high-speed scene.
In the foregoing solution, the transmission mode configuration module is specifically configured to: the base station transmission mode is configured to TM8 by sending an RRC Connection Reconfiguration message.
In the foregoing solution, the frequency offset precompensation module is specifically configured to:
estimating Doppler frequency offset of an uplink signal received from a mobile terminal;
and performing frequency offset pre-compensation on the downlink special RS and PDSCH signals according to the Doppler frequency offset of the uplink signals.
The embodiment of the invention also provides a mobile terminal, which is used for:
receiving the downlink special RS and PDSCH signals after the frequency offset precompensation;
and performing channel estimation according to the downlink special RS subjected to frequency offset precompensation, and demodulating the PDSCH signal subjected to frequency offset precompensation.
According to the frequency offset precompensation method and device provided by the embodiment of the invention, when the mobile terminal is confirmed to be in a high-speed scene, a base station transmission mode is configured to be TM 8; performing frequency offset pre-compensation on a downlink dedicated Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal; and sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal. Therefore, the base station performs frequency offset compensation on the PDSCH signal in advance, the requirement on the frequency offset demodulation capacity of the mobile terminal in a high-speed scene can be lowered, the phenomenon of network disconnection is avoided, and the user experience is improved.
Drawings
FIG. 1 is a flow chart of a frequency offset precompensation method according to an embodiment of the present invention;
FIG. 2 is a flow chart 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 precompensation apparatus according to an embodiment of the present invention.
Detailed Description
In the LTE system, the mobile terminal mainly relies on the downlink Reference Signals (RS) from the base station for downlink channel estimation, and the downlink RS of the base station is applicable to the whole cell and cannot be processed for a single mobile terminal.
Therefore, in the embodiment of the present invention, 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 scene, configuring the transmission mode of the base station as TM 8; the base station carries out frequency offset pre-compensation on the downlink special RS and PDSCH signals; and sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal. In this way, the doppler frequency offset of the downlink dedicated RS and PDSCH signals received by the mobile terminal is very small or no doppler frequency offset is already available.
The following describes the implementation of the technical solution of the present invention in further detail with reference to the accompanying drawings and specific embodiments. Fig. 1 is a schematic flow chart of a frequency offset precompensation method according to an embodiment of the present invention, as shown in fig. 1, the frequency offset precompensation method of the present embodiment includes the following steps:
step 101: when the base station confirms that the mobile terminal is in a high-speed scene, configuring a base station transmission mode as TM 8;
in this step, the step of the base station confirming that the mobile terminal is in the high-speed scene includes: the base station estimates the 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 value, the base station confirms that the mobile terminal is in a high-speed scene;
the preset threshold may be set according to actual requirements, for example, on the premise that no offline or no influence on user experience is set, the maximum value of doppler frequency offset that most mobile terminals can bear or process is used as the preset threshold on the base station side.
The configuring the transmission mode of the mobile terminal to be TM8 includes: the base station configures the transmission mode of the mobile terminal to be TM8 by sending a radio resource control Connection Reconfiguration message (RRC Connection Reconfiguration) message; wherein the TM8 mode is a dual-current Beamforming mode.
Step 102: the base station carries out frequency offset pre-compensation on a downlink special Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal;
the base station performs frequency offset pre-compensation on the downlink special RS and the PDSCH, and the frequency offset pre-compensation comprises the following steps: and the base station estimates the Doppler frequency offset of the received uplink signal from the mobile terminal in real time, and performs frequency offset pre-compensation on the downlink special RS and PDSCH signals according to the Doppler frequency offset of the uplink signal.
Step 103: and sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal.
In the embodiment of the invention, after receiving the downlink special RS and PDSCH signals after the frequency offset precompensation, the mobile terminal carries out channel estimation according to the downlink special RS after the frequency offset precompensation and demodulates the PDSCH signals after the frequency offset precompensation.
Fig. 2 is a schematic flow chart of a second frequency offset precompensation method according to an embodiment of the present invention, as shown in fig. 2, the frequency offset precompensation method according to the embodiment of the present invention includes the following steps:
step 201: the mobile terminal initiates a service;
in the step, the LTE mobile terminal moving at high speed initiates a service according to a normal flow and sends an uplink signal to a base station;
step 202: the base station estimates the Doppler frequency offset of an uplink signal sent by the mobile terminal;
step 203: judging whether the Doppler frequency offset of the uplink signal of the mobile terminal is higher than a preset threshold value or not, and if the Doppler frequency offset of the uplink signal of the mobile terminal is higher than the preset threshold value, determining that the mobile terminal is in a high-speed moving scene at the moment, and executing step 204; otherwise, go to step 210, and end the process;
the preset threshold may be set according to actual requirements, for example, on the premise that no off-line or user experience is not affected, the maximum value of the doppler frequency offset that most mobile terminals can bear or process is set as the preset threshold on the base station side.
Step 204: the base station sends RRC Connection Reconfiguration information and configures the transmission mode of the base station as TM 8;
wherein the TM8 mode is a dual-current Beamforming mode
Step 205: the base station estimates the Doppler frequency offset of the uplink signal in real time;
step 206: the base station performs frequency offset pre-compensation on the downlink special RS and the PDSCH according to the Doppler frequency offset of the uplink signal;
step 207: the base station sends the special downlink RS and the PDSCH subjected to frequency offset precompensation to the mobile terminal;
step 208: the mobile terminal receives the downlink special RS and PDSCH signals after the frequency offset pre-compensation;
step 209: the mobile terminal carries out channel estimation according to the downlink special RS and demodulates the PDSCH signal after frequency offset precompensation;
step 210: the process is ended.
The embodiment of the present invention further provides a frequency offset precompensation apparatus, the apparatus is located at the base station side, fig. 3 is a schematic structural diagram of the frequency offset precompensation apparatus in the embodiment of the present invention, as shown in fig. 3, the apparatus includes a confirmation module 31, a transmission mode configuration module 32, a frequency offset precompensation module 33, and a sending module 34, wherein,
the confirming module 31 is configured to confirm whether the mobile terminal is in a high-speed scene;
in the embodiment of the present invention, the confirmation module 31 is specifically configured to: estimating Doppler frequency offset of an uplink signal received from a mobile terminal; and when the Doppler frequency offset of the uplink signal is higher than a preset threshold value, confirming that the mobile terminal is in a high-speed scene.
The preset threshold may be set according to actual requirements, for example, on the premise that no offline or no influence on user experience is set, the maximum value of doppler frequency offset that most mobile terminals can bear or process is used as the preset threshold on the base station side.
The transmission mode configuration module 32 is configured to configure the base station transmission mode as TM8 when it is determined that the mobile terminal is in a high-speed scene;
in this embodiment of the present invention, the transmission mode configuration module 32 is specifically configured to: configuring a base station transmission mode as TM8 by sending an RRC Connection Reconfiguration message; wherein the TM8 mode is a dual-current 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;
in this embodiment of the present invention, the frequency offset precompensation module 33 is specifically configured to: estimating Doppler frequency offset of an uplink signal received from the mobile terminal in real time; and performing frequency offset pre-compensation on the downlink special RS and PDSCH signals according to the Doppler frequency offset of the uplink signals.
The sending module 34 is configured to send the downlink dedicated RS and PDSCH signals after frequency offset precompensation to the mobile terminal.
The embodiment of the invention also provides a mobile terminal, which is used for: receiving the downlink special RS and PDSCH signals after the frequency offset precompensation; and performing channel estimation according to the downlink special RS subjected to frequency offset precompensation, and demodulating the PDSCH signal subjected to frequency offset precompensation.
The functions of the processing modules in the apparatus for pre-compensation of frequency offset shown in fig. 3 can be understood by referring to the related description of the method for pre-compensation of frequency offset. Those skilled in the art will understand that the functions of the processing modules in the frequency offset pre-compensation apparatus shown in fig. 3 can be implemented by a program running on a processor, and can also be implemented by specific logic circuits, such as: may be implemented by a Central Processing Unit (CPU), Microprocessor (MPU), Digital Signal Processor (DSP), or Field Programmable Gate Array (FPGA).
In the embodiments provided in the present invention, it should be understood that the disclosed method and apparatus can be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the modules is only one logical functional division, and other division manners may be implemented in practice, such as: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the communication connections between the components shown or discussed may be through interfaces, indirect couplings or communication connections of devices or modules, and may be electrical, mechanical or other.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, that is, may be located in one place, or may be distributed on a plurality of network modules; some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all functional modules in the embodiments of the present invention may be integrated into one processing module, or each module may be separately used as one module, or two or more modules may be integrated into one module; the integrated module can be realized in a hardware form, and can also be realized in a form of hardware and a software functional module.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read-Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated module according to 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 functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The frequency offset pre-compensation method and apparatus described in the embodiments of the present invention are only examples of the above embodiments, but not limited to them, and those skilled in the art should understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (5)
1. A method of frequency offset precompensation, said method comprising:
estimating Doppler frequency offset of an uplink signal sent by a received mobile terminal;
confirming that the mobile terminal is in a high-speed scene when the Doppler frequency offset of an uplink signal sent by the mobile terminal is higher than a preset threshold value;
when the mobile terminal is confirmed to be in a high-speed scene, configuring the transmission mode of the base station as TM 8;
estimating Doppler frequency offset of the uplink signal in real time;
according to the Doppler frequency offset of the uplink signal, performing frequency offset pre-compensation on a downlink dedicated Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal;
sending the downlink special RS and PDSCH signals subjected to frequency offset precompensation to the mobile terminal; wherein the mobile terminal is configured to:
receiving the downlink special RS and PDSCH signals after the frequency offset precompensation; and performing channel estimation according to the downlink special RS subjected to frequency offset precompensation, and demodulating the PDSCH signal subjected to frequency offset precompensation.
2. The method of claim 1, wherein the configuring the base station transmission mode as TM8 comprises:
the base station transmission mode is configured to TM8 by sending an RRC Connection Reconfiguration message.
3. An apparatus for frequency offset precompensation, said apparatus comprising: a confirming module, a transmission mode configuration module, a frequency deviation precompensation module and a sending module, wherein,
the confirming module is used for estimating the Doppler frequency offset of the received uplink signal from the mobile terminal and confirming whether the mobile terminal is in a high-speed scene; the mobile terminal is also used for confirming that the mobile terminal is in a high-speed scene when the Doppler frequency offset of the uplink signal sent by the mobile terminal is higher than a preset threshold value;
the transmission mode configuration module is used for configuring a base station transmission mode as TM8 when the mobile terminal is confirmed to be in a high-speed scene;
the frequency offset pre-compensation module is used for estimating the Doppler frequency offset of the uplink signal in real time and performing frequency offset pre-compensation on a downlink dedicated Reference Signal (RS) and a Physical Downlink Shared Channel (PDSCH) signal according to the Doppler frequency offset of the uplink signal;
the sending module is used for sending the downlink special RS and PDSCH signals after the frequency offset precompensation to the mobile terminal; wherein the mobile terminal is configured to:
receiving the downlink special RS and PDSCH signals after the frequency offset precompensation;
and performing channel estimation according to the downlink special RS subjected to frequency offset precompensation, and demodulating the PDSCH signal subjected to frequency offset precompensation.
4. The apparatus of claim 3, wherein the transmission mode configuration module is specifically configured to: the base station transmission mode is configured to TM8 by sending an RRC Connection Reconfiguration message.
5. A mobile terminal, characterized in that the mobile terminal is configured to:
receiving downlink special RS and PDSCH signals after frequency offset precompensation; the downlink dedicated RS and PDSCH signals are transmitted by the base station side by executing the frequency offset precompensation method of claim 1 or 2;
and performing channel estimation according to the downlink special RS subjected to frequency offset precompensation, and demodulating the PDSCH signal subjected to frequency offset precompensation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510454132.6A CN106411800B (en) | 2015-07-29 | 2015-07-29 | Frequency offset precompensation method and device |
| PCT/CN2016/083526 WO2017016303A1 (en) | 2015-07-29 | 2016-05-26 | Method and apparatus for pre-compensating frequency offset |
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| CN201510454132.6A CN106411800B (en) | 2015-07-29 | 2015-07-29 | Frequency offset precompensation method and device |
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| CN107911325B (en) * | 2017-11-30 | 2020-02-07 | 中兴通讯股份有限公司 | Frequency offset precompensation method and device and communication equipment |
| CN111698064B (en) * | 2019-03-14 | 2023-06-30 | 中国移动通信有限公司研究院 | Method, device, equipment and medium for sending enhanced demodulation reference signal |
| WO2021128026A1 (en) * | 2019-12-24 | 2021-07-01 | 华为技术有限公司 | Information sending method, information receiving method and apparatus |
| CN113055995B (en) * | 2019-12-26 | 2023-10-27 | 中兴通讯股份有限公司 | Frequency offset estimation method and device |
| CN113364714B (en) * | 2020-03-05 | 2023-02-17 | 大唐移动通信设备有限公司 | Frequency compensation method, device, network side equipment, terminal and storage medium |
| CN114391243A (en) * | 2020-08-05 | 2022-04-22 | 北京小米移动软件有限公司 | Frequency offset compensation and calibration method and device, and storage medium |
| CN114520984A (en) * | 2020-11-20 | 2022-05-20 | 中国移动通信有限公司研究院 | Transmission processing method, device and equipment |
| CN116723074B (en) * | 2023-08-10 | 2023-10-27 | 北京智芯微电子科技有限公司 | Downlink synchronization method, device, equipment, chip and readable storage medium |
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| CN106411800A (en) | 2017-02-15 |
| WO2017016303A1 (en) | 2017-02-02 |
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