CN114244418A

CN114244418A - Frequency offset compensation method and device

Info

Publication number: CN114244418A
Application number: CN202111340366.XA
Authority: CN
Inventors: 易雄书
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-03-25
Anticipated expiration: 2041-11-12
Also published as: WO2023083204A1; CN114244418B; CN116886151A

Abstract

The application provides a frequency offset compensation method and a frequency offset compensation device, which can solve the problem of large downlink frequency offset, thereby improving the decoding success rate of downlink signals and being applicable to a communication system. The method comprises the following steps: the terminal equipment acquires a first frequency offset. Wherein the first frequency offset is one of the candidate frequency offsets of the plurality of candidate frequency offsets, in which the synchronization signal and the broadcast channel block SSB have been successfully decoded. The candidate frequency offsets are determined by the terminal device according to the frequency interval, and the frequency interval between two adjacent frequency offsets in the candidate frequency offsets is smaller than the subcarrier interval. And the terminal equipment performs frequency offset compensation according to the first frequency offset.

Description

Frequency offset compensation method and device

Technical Field

The present application relates to the field of communications, and in particular, to a frequency offset compensation method and apparatus.

Background

Satellite communication is one kind of non-terrestrial network (NTN) communication, and compared with terrestrial network communication, satellite communication has the characteristics of wide coverage and difficulty in being damaged by natural disasters or external forces, and can be used for providing communication services for areas which cannot be covered by the terrestrial network. In a satellite communication system, a satellite moves at a high speed relative to the ground, and therefore, a large doppler frequency offset is generated between the satellite and a terminal device.

Currently, uplink frequency offset compensation can be performed based on a terminal device. Specifically, the terminal device may obtain the doppler frequency offset according to a Global Navigation Satellite System (GNSS) and ephemeris information of the satellite, such as a semi-major axis, an eccentricity, an orbit inclination, a ascent point right-angle of a rising intersection, a near-point amplitude angle, a flat near-point angle, reference time, and the like of the satellite, and further perform frequency offset compensation according to the doppler frequency offset in advance when the uplink signal is transmitted.

However, the above uplink frequency offset compensation scheme can only perform frequency offset compensation on the uplink signal, and the downlink signal, such as a synchronization signal and a broadcast channel block (SSB), still has a large frequency offset, which results in a low decoding success rate of the downlink signal. In addition, in the above frequency offset compensation scheme, GNSS information needs to be acquired, and the applicability is low.

Disclosure of Invention

The embodiment of the application provides a frequency offset compensation method and device, which can solve the problem of large downlink frequency offset, thereby improving the decoding success rate of downlink signals.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, a method of frequency offset compensation is provided. The frequency offset compensation method comprises the following steps: the terminal equipment acquires a first frequency offset. Wherein the first frequency offset is one of the candidate frequency offsets of the plurality of candidate frequency offsets, in which the synchronization signal and the broadcast channel block SSB have been successfully decoded. The candidate frequency offsets are determined by the terminal device according to the frequency interval, and the frequency interval between two adjacent frequency offsets in the candidate frequency offsets is smaller than the subcarrier interval. And the terminal equipment performs frequency offset compensation according to the first frequency offset.

Based on the frequency offset compensation method provided by the first aspect, the terminal device may determine a plurality of candidate frequency offsets according to the frequency interval, determine a candidate frequency offset, which can successfully decode the SSB, of the plurality of candidate frequency offsets as the first frequency offset, and then perform frequency offset compensation according to the first frequency offset, where the frequency interval is smaller than the subcarrier interval, so that frequency sweeping according to the subcarrier interval may be avoided, the granularity of frequency sweeping may be reduced, so as to improve the accuracy of frequency offset compensation of the downlink signal, further reduce the influence of the frequency offset on the downlink signal, and improve the decoding success rate of the downlink data.

In addition, in the embodiment of the application, the situation that the first frequency offset is determined by using the position information of the terminal device can be avoided, so that the applicability can be improved.

In one possible design, the obtaining, by the terminal device, the first frequency offset may include: and the terminal equipment acquires a plurality of candidate frequency offsets according to the frequency intervals. And the terminal equipment decodes the SSB according to each candidate frequency offset. The terminal equipment determines one of the candidate frequency offsets for successfully decoding the SSB as a first frequency offset.

Optionally, the determining, by the terminal device, one of the candidate frequency offsets for successfully decoding the SSB as the first frequency offset may include: and the terminal equipment determines the candidate frequency offset corresponding to the SSB with the best signal quality in the successfully decoded SSBs as the first frequency offset. The first frequency offset is an integer multiple of the frequency interval, i.e., a coarse frequency offset. Therefore, the candidate frequency offset corresponding to the SSB with the best signal quality is determined as the first frequency offset, so that the influence of interference signals can be reduced, and the more accurate first frequency offset can be obtained, thereby further improving the decoding success rate of downlink signals.

In a possible design, the frequency offset compensation method provided in the first aspect may further include: and the terminal equipment acquires the second frequency offset according to the reference signal corresponding to the SSB. Wherein the second frequency offset is smaller than the frequency interval, i.e., the fine frequency offset. The terminal device performs frequency offset compensation according to the first frequency offset, and may include: and the terminal equipment performs frequency offset compensation according to the first frequency offset and the second frequency offset. Therefore, the terminal equipment can perform more fine frequency offset compensation and further reduce the frequency offset of the downlink signal, thereby further improving the decoding success rate of the downlink signal.

In a second aspect, a method of frequency offset compensation is provided. The frequency offset compensation method comprises the following steps: and the terminal equipment acquires the third frequency offset. The third bias is determined according to the first ephemeris information and the position of the terminal device, and the first ephemeris information includes one or more of the following items: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. And the terminal equipment performs downlink frequency offset compensation according to the third frequency offset.

Based on the frequency offset compensation method provided in the second aspect, the terminal device may obtain the third frequency offset according to the first ephemeris information and the position of the terminal device, and then perform downlink frequency offset compensation according to the third frequency offset, so that the influence of the frequency offset on the downlink signal may be reduced, for example, the terminal device may decode the downlink signal based on the frequency point after the frequency offset compensation, so as to improve the decoding success rate of the downlink signal.

In one possible design, the obtaining, by the terminal device, the third frequency offset may include: and the terminal equipment acquires a third frequency offset according to the first ephemeris information and the position of the terminal equipment.

Optionally, the frequency offset compensation method provided in the second aspect may further include: the terminal device decodes the SSB according to the third frequency offset. And the third frequency offset is frequency offset determined according to the first ephemeris information and the position of the terminal equipment, namely coarse frequency offset. Therefore, the terminal device performs frequency offset compensation on the SSB according to the third frequency offset, and based on the SSB decoding after the frequency offset compensation, the influence of the frequency offset on the SSB can be reduced, so that the decoding success rate of the SSB can be improved.

Further, the frequency offset compensation method provided by the second aspect may further include: and the terminal equipment acquires the fourth frequency offset according to the reference signal corresponding to the SSB. And the fourth frequency offset is smaller than the third frequency offset, namely the fourth frequency offset is a fine frequency offset. The terminal device performs downlink frequency offset compensation according to the third frequency offset, which may include: and the terminal equipment performs downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset. Therefore, the terminal equipment can perform finer frequency offset compensation, and further reduce the influence of the frequency offset on the downlink signal, thereby further improving the decoding success rate of the downlink signal.

In a possible design, the frequency offset compensation method provided in the second aspect may further include: and the terminal equipment receives the auxiliary system information. And the secondary system information carries second ephemeris information. And updating the first ephemeris information according to the second ephemeris information. The second ephemeris information may include one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. Therefore, the terminal equipment updates the first ephemeris information according to the received second ephemeris information, and can determine the third frequency offset according to the real-time ephemeris information of the satellite under the condition that the satellite moves, so that the error of the third frequency offset caused by the position change of the satellite is reduced, the accuracy of frequency offset compensation is further improved, and the decoding success rate of the downlink signal is further improved.

In a third aspect, a method of frequency offset compensation is provided. The frequency offset compensation method comprises the following steps: and the network equipment acquires a fifth frequency offset according to the third ephemeris information and the geographic information. Wherein the third calendar information includes one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. The geographic information is used to indicate the location of the coverage area of the network device. And the network equipment sends the synchronous signal and the downlink broadcast channel block SSB according to the fifth frequency offset.

Based on the frequency offset compensation method provided in the third aspect, the network device may obtain the fifth frequency offset according to the third ephemeris information and the geographic information, and send the SSB according to the fifth frequency offset, so that the SSB frequency offset may be compensated in advance to reduce the frequency offset of the SSB reaching the terminal device, thereby improving the decoding success rate of the SSB.

In a possible design, the frequency offset compensation method provided in the third aspect may further include: and the network equipment sends the auxiliary system information or the downlink control signaling according to the fifth frequency offset. And the auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset. The fifth frequency offset is the frequency offset determined according to the ephemeris information and the geographic information, i.e. the coarse frequency offset, so that the auxiliary system information indicates the terminal equipment to perform frequency offset compensation according to the fifth frequency offset, and each terminal equipment can perform coarse frequency offset compensation on other downlink signals or downlink channels except the SSB and the auxiliary system information according to the corresponding fifth frequency offset, thereby avoiding frequent adjustment of the clock frequency of the crystal oscillator when the network equipment sends data signals to different terminal equipment, reducing the overhead of the network equipment, reducing the time for adjusting the clock frequency of the crystal oscillator, and improving the communication efficiency.

In a possible design, the frequency offset compensation method provided in the third aspect may further include: and the network equipment sends signals except the SSB in the downlink signals according to the fifth frequency offset. The fifth frequency offset is the frequency offset determined according to the ephemeris information and the geographic information, i.e. the coarse frequency offset, so that the network device realizes the coarse frequency offset compensation of the downlink data signal, the operation of the terminal device can be simplified, and the decoding efficiency of the terminal device is improved.

In a fourth aspect, a method of frequency offset compensation is provided. The frequency offset compensation method comprises the following steps: the network equipment acquires the time advance. Wherein the timing advance is related to a coverage area of the network device. The network device transmits the timing advance. The time advance is used for the terminal equipment in the coverage area to send signals to the network equipment.

Based on the frequency offset compensation method provided in the fourth aspect, the network device obtains the time advance and sends the time advance to the terminal device, where the time advance is related to a coverage area of the network device. In this way, the network device may determine the timing advance based on the coverage area of the network device, for example, the network device may use the position in the coverage area as the position of the terminal device, so that the GNSS information of the terminal device may be avoided from being used to obtain the frequency offset, and the applicability is improved.

In one possible design, the acquiring, by the network device, the timing advance may include: and the network equipment acquires the time lead according to the position of the network equipment and the position of the coverage area.

Illustratively, the location of the coverage area of the network device may be a central location of the coverage area of the network device. Alternatively, the location of the coverage area of the network device may be a plurality of locations within the coverage area.

In one possible design, the timing advance may be carried in one or more of the following: secondary system information block, or downlink control signaling. Therefore, the terminal equipment can receive the time advance before sending the uplink signal and send the signal according to the time advance, so that the signal can arrive at the network equipment on time, and the receiving success rate is improved.

In a fifth aspect, a method of frequency offset compensation is provided. The frequency offset compensation method comprises the following steps: the terminal equipment receives the timing advance. Wherein the timing advance is related to a coverage area of the network device. And the terminal equipment sends a signal to the network equipment according to the time advance.

In one possible design, the timing advance may be determined based on a location of the network device and a location of a coverage area of the network device.

In one possible design, the timing advance may be carried in one or more of the following: secondary system information block, or downlink control signaling.

In addition, for technical effects of the frequency offset compensation method according to the fifth aspect, reference may be made to the technical effects of the frequency offset compensation method according to the fourth aspect, and details are not repeated here.

In a sixth aspect, a frequency offset compensation method is provided, where the frequency offset compensation method includes: the network equipment acquires the time advance. Wherein the timing advance is related to a coverage area of the network device. The network device receives the signal according to the time advance.

Based on the frequency offset compensation method provided in the sixth aspect, the network device obtains the timing advance, and receives the signal from the terminal device according to the timing advance, where the timing advance is related to the coverage area of the network device. In this way, the network device may determine the timing advance based on the coverage area of the network device, for example, the network device may use the position in the coverage area as the position of the terminal device, so that the GNSS information of the terminal device may be avoided from being used to obtain the frequency offset, and the applicability is improved.

In one possible design, the acquiring, by the network device, the timing advance may include: and the network equipment acquires the time lead according to the position of the network equipment and the position of the coverage area of the network equipment.

In one possible design, the receiving, by the network device, a signal according to the timing advance may include: the network device receives the signal from the terminal device with a lag time advance. Therefore, the network equipment can receive the signal on time when the signal reaches the network equipment, and the receiving success rate can be improved.

In a seventh aspect, an apparatus for frequency offset compensation is provided. The frequency offset compensation device comprises: the device comprises an acquisition module and a compensation module. The obtaining module is configured to obtain a first frequency offset. Wherein the first frequency offset is one of the candidate frequency offsets of the plurality of candidate frequency offsets, in which the synchronization signal and the broadcast channel block SSB have been successfully decoded. The candidate frequency offsets are determined by the terminal device according to the frequency interval, and the frequency interval between two adjacent frequency offsets in the candidate frequency offsets is smaller than the subcarrier interval. And the compensation module is used for carrying out frequency offset compensation according to the first frequency offset.

In one possible design, the obtaining module is configured to obtain a plurality of candidate frequency offsets according to a frequency interval, and decode the SSB according to each candidate frequency offset. An obtaining module, configured to determine one of candidate frequency offsets for successfully decoding the SSB as a first frequency offset.

Optionally, the obtaining module is configured to determine, as the first frequency offset, a candidate frequency offset corresponding to an SSB with the best signal quality in the successfully decoded SSBs.

In a possible design, the obtaining module is further configured to obtain the second frequency offset according to a reference signal corresponding to the SSB. Wherein the second frequency offset is less than the frequency interval. And the compensation module is used for carrying out frequency offset compensation according to the first frequency offset and the second frequency offset.

Alternatively, the acquisition module and the compensation module may be integrated into one module, such as a processing module. The processing module is used for realizing the processing function of the frequency deviation compensation device.

Optionally, the apparatus for frequency offset compensation according to the seventh aspect may further include a storage module, where the storage module stores a program or instructions. When the program or the instructions are executed by the processing module, the frequency offset compensation apparatus may execute the frequency offset compensation method according to the first aspect.

Optionally, the frequency offset compensation apparatus in the seventh aspect may further include a transceiver module. The receiving and sending module is used for realizing the sending function and the receiving function of the frequency deviation compensation device.

It should be noted that the frequency offset compensation apparatus in the seventh aspect may be a terminal device, a chip (system) or other component or assembly that may be disposed in the terminal device, or an apparatus including the terminal device, and this application is not limited thereto.

In addition, for technical effects of the frequency offset compensation apparatus in the seventh aspect, reference may be made to technical effects of the frequency offset compensation method in the first aspect, and details are not repeated here.

In an eighth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: the device comprises an acquisition module and a compensation module. And the obtaining module is used for obtaining the third frequency offset. The third bias is determined according to the first ephemeris information and the position of the terminal device, and the first ephemeris information includes one or more of the following items: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. And the compensation module is used for performing downlink frequency offset compensation according to the third frequency offset.

In a possible design, the obtaining module is configured to obtain the third frequency offset according to the first ephemeris information and the location of the terminal device.

Optionally, the compensation module is further configured to decode the SSB according to the third frequency offset.

Further, the obtaining module is configured to obtain a fourth frequency offset according to the reference signal corresponding to the SSB. Wherein the fourth frequency offset is less than the third frequency offset. And the compensation module is used for performing downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset.

In one possible design, the obtaining module is further configured to receive secondary system information. And the secondary system information carries second ephemeris information. And the acquisition module is further used for updating the first ephemeris information according to the second ephemeris information. The second ephemeris information may include one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite.

Optionally, the apparatus for frequency offset compensation according to the eighth aspect may further include a storage module, where the storage module stores a program or instructions. When the program or the instructions are executed by the processing module, the frequency offset compensation apparatus may be enabled to execute the frequency offset compensation method according to the second aspect.

Optionally, the frequency offset compensation apparatus in the eighth aspect may further include a transceiver module. The receiving and sending module is used for realizing the sending function and the receiving function of the frequency deviation compensation device.

It should be noted that, the frequency offset compensation apparatus in the eighth aspect may be a terminal device, or may be a chip (system) or other component or assembly that may be disposed in the terminal device, or may be an apparatus that includes the terminal device, which is not limited in this application.

In addition, for the technical effect of the frequency offset compensation apparatus according to the eighth aspect, reference may be made to the technical effect of the frequency offset compensation method according to the second aspect, and details are not repeated here.

In a ninth aspect, a frequency offset compensation apparatus is provided, which includes: a processing module and a transceiver module. And the processing module is used for acquiring a fifth frequency offset according to the third ephemeris information and the geographic information. Wherein the third calendar information includes one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. The geographic information is used to indicate the location of the coverage area of the network device. And the transceiver module is used for sending the synchronization signal and the downlink broadcast channel block SSB according to the fifth frequency offset.

In a possible design, the transceiver module is further configured to send the secondary system information or the downlink control signaling according to a fifth frequency offset. And the auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset.

Optionally, the transceiver module is further configured to send, according to the fifth frequency offset, signals other than the SSB in the downlink signal.

Optionally, the transceiver module may include a receiving module and a transmitting module. The transceiver module is configured to implement the sending function and the receiving function of the frequency offset compensation apparatus according to the ninth aspect.

Optionally, the apparatus for frequency offset compensation according to the ninth aspect may further include a storage module, where the storage module stores a program or instructions. When the program or the instructions are executed by the processing module, the frequency offset compensation apparatus may be enabled to execute the frequency offset compensation method according to the third aspect.

It should be noted that, the frequency offset compensation apparatus in the ninth aspect may be a network device, a chip (system) or other component or assembly that may be disposed in the network device, or an apparatus including the network device, which is not limited in this application.

In addition, for technical effects of the frequency offset compensation apparatus according to the ninth aspect, reference may be made to technical effects of the frequency offset compensation method according to the third aspect, and details are not repeated here.

In a tenth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: a processing module and a transceiver module. And the processing module is used for acquiring the time advance. Wherein the timing advance is related to a coverage area of the network device. And the transceiver module is used for transmitting the time advance. The time advance is used for the terminal equipment in the coverage area of the network equipment to send signals to the network equipment.

In a possible design, the processing module is configured to obtain the timing advance according to a location of the network device and a location of the coverage area.

In one possible embodiment, the timing advance is carried in one or more of the following: secondary system information block, or downlink control signaling.

Optionally, the transceiver module may include a receiving module and a transmitting module. Wherein, the transceiver module is used to implement the transmitting function and the receiving function of the frequency offset compensation apparatus of the tenth aspect.

Optionally, the apparatus for frequency offset compensation according to the tenth aspect may further include a storage module, where the storage module stores a program or instructions. When the program or the instructions are executed by the processing module, the frequency offset compensation apparatus may be enabled to execute the frequency offset compensation method according to the fourth aspect.

It should be noted that, the frequency offset compensation apparatus in the tenth aspect may be a network device, a chip (system) or other component or assembly that may be disposed in the network device, or an apparatus including the network device, and the present application is not limited thereto.

In addition, for the technical effect of the frequency offset compensation apparatus according to the tenth aspect, reference may be made to the technical effect of the frequency offset compensation method according to the fourth aspect, and details are not repeated here.

In an eleventh aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: the device comprises a receiving module and a sending module. And the receiving module is used for receiving the time advance. Wherein the timing advance is related to a coverage area of the network device. And the sending module is used for sending a signal to the network equipment according to the time advance.

In one possible design, the timing advance is determined based on a location of the network device and a location of a coverage area of the network device.

Optionally, the transceiver module may include a receiving module and a transmitting module. The transceiver module is configured to implement the transmitting function and the receiving function of the frequency offset compensation apparatus according to the eleventh aspect.

Optionally, the frequency offset compensation apparatus according to the eleventh aspect may further include a storage module, where the storage module stores a program or instructions. When the program or the instructions are executed by the processing module, the frequency offset compensation apparatus may be enabled to execute the frequency offset compensation method according to the fifth aspect.

It should be noted that, the frequency offset compensation apparatus in the eleventh aspect may be a terminal device, a chip (system) or other component or assembly that can be disposed in the terminal device, or an apparatus including the terminal device, and the present application is not limited thereto.

In addition, for technical effects of the frequency offset compensation apparatus according to the eleventh aspect, reference may be made to technical effects of the frequency offset compensation method according to the fifth aspect, and details are not repeated here.

In a twelfth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: a processing module and a transceiver module. The processing module is used for acquiring the time advance. Wherein the timing advance is related to a coverage area of the network device. And the transceiver module is used for receiving the signal according to the time advance.

In a possible design, the processing module is configured to obtain the timing advance according to a location of the network device and a location of a coverage area of the network device.

In one possible embodiment, the transceiver module is configured to receive a signal from the terminal device with a time lag of the time advance.

Optionally, the transceiver module may include a receiving module and a transmitting module. The transceiver module is configured to implement the transmitting function and the receiving function of the frequency offset compensation apparatus according to the twelfth aspect.

Optionally, the apparatus for frequency offset compensation according to the twelfth aspect may further include a storage module, where the storage module stores a program or instructions. When the program or the instructions are executed by the processing module, the frequency offset compensation apparatus may execute the frequency offset compensation method according to the sixth aspect.

It should be noted that, the frequency offset compensation apparatus in the twelfth aspect may be a network device, a chip (system) or other component or assembly that may be disposed in the network device, or an apparatus including the network device, and the application is not limited thereto.

In addition, for the technical effect of the frequency offset compensation apparatus according to the twelfth aspect, reference may be made to the technical effect of the frequency offset compensation method according to the sixth aspect, and details are not repeated here.

In a thirteenth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation apparatus is configured to perform the frequency offset compensation method described in any implementation manner of the first aspect to the sixth aspect.

In this application, the frequency offset compensation apparatus according to the thirteenth aspect may be the terminal device according to any one of the first, second, or fifth aspects or the network device according to any one of the third, fourth, or sixth aspects, or a chip (system) or other component or assembly that can be disposed in the terminal device or the network device, or an apparatus that includes the terminal device or the network device.

It should be understood that the frequency offset compensation apparatus according to the thirteenth aspect includes corresponding modules, units, or means (means) for implementing the frequency offset compensation method according to any one of the first to sixth aspects, and the modules, units, or means can be implemented by hardware, software, or by hardware executing corresponding software. The hardware or software includes one or more modules or elements for performing the functions involved in the above-described frequency offset compensation method.

In a fourteenth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: a processor configured to perform the frequency offset compensation method according to any one of the possible implementation manners of the first aspect to the sixth aspect.

In a possible design, the frequency offset compensation apparatus according to the fourteenth aspect may further include a transceiver. The transceiver may be a transmit-receive circuit or an interface circuit. The transceiver may be used for the frequency offset compensation apparatus of the fourteenth aspect to communicate with other frequency offset compensation apparatuses.

In a possible design, the frequency offset compensation apparatus according to the fourteenth aspect may further include a memory. The memory may be integral with the processor or may be separate. The memory may be used for storing computer programs and/or data related to the frequency offset compensation method according to any one of the first to sixth aspects.

In this application, the frequency offset compensation apparatus according to the fourteenth aspect may be the terminal device according to any one of the first, second, or fifth aspects or the network device according to any one of the third, fourth, or sixth aspects, or a chip (system) or other component or assembly that can be disposed in the terminal device or the network device, or an apparatus that includes the terminal device or the network device.

In a fifteenth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: a processor, coupled to the memory, for executing the computer program stored in the memory, so as to enable the frequency offset compensation apparatus to perform the frequency offset compensation method described in any one of the possible implementation manners of the first aspect to the sixth aspect.

In a possible design, the frequency offset compensation apparatus according to the fifteenth aspect may further include a transceiver. The transceiver may be a transmit-receive circuit or an interface circuit. The transceiver may be used for the frequency offset compensation apparatus of the fifteenth aspect to communicate with other frequency offset compensation apparatuses.

In this application, the frequency offset compensation apparatus according to the fifteenth aspect may be the terminal device according to any one of the first, second, or fifth aspects or the network device according to any one of the third, fourth, or sixth aspects, or a chip (system) or other component or assembly that can be disposed in the terminal device or the network device, or an apparatus that includes the terminal device or the network device.

In a sixteenth aspect, there is provided a frequency offset compensation apparatus, including: a processor and a memory; the memory is used for storing a computer program, and when the processor executes the computer program, the frequency offset compensation apparatus is caused to execute the frequency offset compensation method described in any one of the implementation manners of the first aspect to the sixth aspect.

In a possible design, the frequency offset compensation apparatus according to the sixteenth aspect may further include a transceiver. The transceiver may be a transmit-receive circuit or an interface circuit. The transceiver may be used for the frequency offset compensation apparatus of the sixteenth aspect to communicate with other frequency offset compensation apparatuses.

In this application, the frequency offset compensation apparatus according to the sixteenth aspect may be a terminal device according to any one of the first, second, or fifth aspects or a network device according to any one of the third, fourth, or sixth aspects, or a chip (system) or other component or assembly that can be disposed in the terminal device or the network device, or an apparatus including the terminal device or the network device.

In a seventeenth aspect, there is provided a frequency offset compensation apparatus, including: a processor; the processor is configured to be coupled with the memory, and after reading the computer program in the memory, execute the frequency offset compensation method according to any one of the implementation manners of the first aspect to the sixth aspect.

In a possible design, the frequency offset compensation apparatus of the seventeenth aspect may further include a transceiver. The transceiver may be a transmit-receive circuit or an interface circuit. The transceiver may be used for the frequency offset compensation apparatus of the seventeenth aspect to communicate with other frequency offset compensation apparatuses.

In this application, the frequency offset compensation apparatus according to the seventeenth aspect may be the terminal device according to any one of the first, second, or fifth aspects or the network device according to any one of the third, fourth, or sixth aspects, or a chip (system) or other component or assembly that can be disposed in the terminal device or the network device, or an apparatus that includes the terminal device or the network device.

In addition, for the technical effects of the frequency offset compensation apparatus in the thirteenth aspect to the seventeenth aspect, reference may be made to the technical effects of the frequency offset compensation method in the first aspect to the sixth aspect, and details are not repeated here.

In an eighteenth aspect, a processor is provided. Wherein the processor is configured to execute the frequency offset compensation method described in any one of the possible implementation manners of the first aspect to the sixth aspect.

In a nineteenth aspect, a communication system is provided. The communication system includes one or more terminal devices, and one or more network devices.

In a twentieth aspect, there is provided a computer-readable storage medium comprising: computer programs or instructions; the computer program or the instructions, when executed on a computer, cause the computer to perform the frequency offset compensation method according to any one of the possible implementations of the first to sixth aspects.

A twenty-first aspect provides a computer program product comprising a computer program or instructions which, when run on a computer, causes the computer to perform the frequency offset compensation method of any one of the possible implementations of the first to sixth aspects.

Drawings

Fig. 1 is a schematic diagram illustrating a relationship between a frequency offset and an elevation angle of a terminal device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 3 is a first flowchart of a frequency offset compensation method according to an embodiment of the present application;

FIG. 4 is a diagram illustrating candidate frequency offsets provided in an embodiment of the present application;

fig. 5 is a second flowchart illustrating a frequency offset compensation method according to an embodiment of the present application;

fig. 6 is a third flowchart of a frequency offset compensation method according to an embodiment of the present application;

fig. 7 is a schematic diagram illustrating a location of a coverage area of a network device according to an embodiment of the present application;

fig. 8 is a fourth flowchart illustrating a frequency offset compensation method according to an embodiment of the present application;

fig. 9 is a fifth flowchart of a frequency offset compensation method according to an embodiment of the present application;

fig. 10 is a first schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application;

fig. 11 is a second schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application.

Detailed Description

For ease of understanding, the prior art related to the present application will be first described below.

In the current communication system, the terminal device may obtain a frequency offset and an uplink Timing Advance (TA) according to the position information and ephemeris information of the terminal device (such as a semi-major axis, an eccentricity, an orbit inclination, a right ascension at a rising intersection point, a argument of a near place, a mean angle of a near point, and a reference time), and then perform frequency offset compensation on uplink data according to the frequency offset, and/or perform compensation on transmission delay according to the time advance. However, in this scheme, the downlink frequency offset is large, and the decoding success rate of the downlink common signal, such as SSB, is low. Since the decoding result of the signal other than the downlink signal is correlated with the decoding result of the SSB, in the case where the SSB decoding fails, the decoding of the signal other than the SSB cannot be performed. In addition, even if the SSB decoding is successful, due to the relaxed decoding condition of the SSB, if the frequency offset estimation based on the SSB is not accurate enough, the decoding of other signals besides the SSB may also fail. That is, there is a problem that the decoding success rate is low for signals other than the downlink signal.

In addition, in the above scheme for obtaining the frequency offset, the position information of the terminal device needs to be determined according to the GNSS, and thus, the problem of low adaptability exists.

In addition, the terminal device needs to acquire a Timing Advance (TA) according to the position information and the ephemeris information of the terminal device, so as to send an uplink signal in advance. The process of acquiring the time advance needs to rely on a Global Navigation Satellite System (GNSS) to acquire the position of the terminal device, and the applicability is low.

Technical terms related to the embodiments of the present application will be first described below.

1. Doppler shift (doppler shift) refers to the change in phase and frequency due to a propagation path difference when one device moves at a certain rate in a certain direction relative to another device.

For example, in a satellite communication system, doppler shift is generated between a satellite and a terminal device, and the doppler shift is related to an elevation angle (elevation degree) of the terminal device and a satellite altitude. In satellite altitude determination, the doppler shift is correlated to the elevation angle of the terminal device. Taking a satellite with Low Earth Orbit (LEO) orbit height of 500 kilometers (km) as an example, the flight speed of the satellite is up to 7.6 kilometers per second (km/s). As shown in fig. 1, the doppler shift of the satellite can be up to 500 kilohertz (kHz) relative to the terrestrial stationary terminals. The doppler shift decreases gradually as the elevation angle of the terminal device increases gradually. The elevation angle of the terminal equipment is an included angle of a connecting line between the terminal equipment and the satellite relative to the ground.

In the embodiments of the present application, the doppler shift may also be referred to as doppler shift, for example, it may be referred to as frequency shift for short, and in the following embodiments, the frequency shift is used for illustration.

2. Timing Advance (TA) refers to transmission delay caused by distance in the process of UE uplink signal reaching network equipment. The terminal equipment can send the uplink signal in advance of the TA. For example, if the terminal device transmits an uplink signal to the network device and desires that the uplink signal reaches the base station at time T1, and the transmission delay between the terminal device and the base station is TA1, the terminal device may transmit the uplink signal at times T1-TA 1.

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical solution of the embodiment of the present application may be applied to various communication systems, for example, a satellite communication system, a car networking communication system, a 4th generation (4G) mobile communication system, such as a Long Term Evolution (LTE) system, a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth generation (5th generation, 5G) mobile communication system, such as a new radio, NR (new radio, NR) system, and a future communication system, such as a sixth generation (6th generation, 6G) mobile communication system.

This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.

In addition, in the embodiments of the present application, words such as "exemplarily", "for example", etc. are used for indicating as examples, illustrations or explanations. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.

In the embodiment of the present invention, "information", "signal", "message", "channel", "signaling" may be used in combination, and it should be noted that the meaning to be expressed is consistent when the difference is not emphasized. "of", "corresponding", and "corresponding" may sometimes be used in combination, it being noted that the intended meaning is consistent when no distinction is made.

In the examples of the present application, the subscripts are sometimes as W₁It may be mistaken for a non-subscripted form such as W1, whose intended meaning is consistent when the distinction is de-emphasized.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

For the convenience of understanding the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 2 as an example. Fig. 2 is a schematic structural diagram of a communication system to which the frequency offset compensation method provided in the embodiment of the present application is applied. As shown in fig. 2, the communication system includes at least one network device 210 (210 a, or 210a and 210b, as shown in fig. 2) and at least one terminal device 220 (220 a or 220b, as shown in fig. 2).

The network device 210 is a device located on the network side of the communication system and having a wireless transceiving function, or a chip system installed on the device. The network devices include, but are not limited to: satellite, aircraft, or Unmanned Aerial System (UAS). Alternatively, the network device may be a device that is installed on a satellite, an aircraft, or a UAS and has a wireless transceiving function, or a chip system that can be installed on the device. Alternatively, the network device may be an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Base Band Unit (BBU), a wireless relay Node, a wireless backhaul Node, a transmission point (transmission and reception point, TRP or transmission point, TP), etc., may also be 5G, such as a gNB in a new radio, NR system, or a transmission point (TRP or TP), one or a group (including multiple antenna panels) of base stations in a 5G system, or may also be a network Node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (distributed unit, DU), etc.

The terminal device 220 is a terminal having a wireless transceiving function and accessing the communication system, or a chip system installed in the terminal. The terminal equipment 220 can also be referred to as a satellite television receiver, a user device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), a vehicle-mounted terminal, an RSU with a terminal function, and the like. The terminal device of the present application may also be a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit that is built in a vehicle as one or more components or units, and the vehicle may implement the frequency offset compensation method provided by the present application through the built-in vehicle-mounted module, vehicle-mounted component, vehicle-mounted chip, or vehicle-mounted unit.

In the communication system shown in fig. 2, a connection device 230, such as a gateway (gateway), may be further included, wherein the network device 210 may communicate with the connection device 230 through a wireless link, and the connection device 230 may communicate with the core network 240.

If the network device 210 is 210a shown in fig. 2, 210a may communicate with the terminal device 220 through a service link (service link), and 210a may communicate with the connection device 230 through a feeder link (feeder link).

If the network device 210 includes 210a and 210b shown in fig. 2, 210a may communicate with the terminal device 210 through a service link, 210a may communicate with 210b through an Inter Satellite Link (ISL), and 210b may communicate with the connection device 230 through a feeder link. In this case, 210a may be used to relay the signal, 210b may be used to perform a codec operation on the signal, and so on. For example, 210b encodes a first signal to be transmitted to the terminal 220, and transmits the encoded first signal to 210a, and 210a transmits the encoded first signal to the terminal device 220. Alternatively, 210a may receive the second signal from the terminal device 220 and send the second signal to 210b, and 210b may decode the second signal after receiving the second signal.

It should be noted that the frequency offset compensation method provided in the embodiment of the present application may be applied between the network device and the terminal device shown in fig. 2, and for specific implementation, reference may be made to the following method embodiment, which is not described herein again.

It should be noted that the scheme in the embodiment of the present application may also be applied to other communication systems, and the corresponding names may also be replaced with names of corresponding functions in other communication systems.

It should be appreciated that fig. 2 is a simplified schematic diagram of an example for ease of understanding, and that other network devices, and/or other terminal devices, not shown in fig. 2, may also be included in the communication system.

The frequency offset compensation method provided by the embodiment of the present application will be specifically described below with reference to fig. 3 to 9.

Exemplarily, fig. 3 is a first flowchart of a frequency offset compensation method provided in an embodiment of the present application. The frequency offset compensation method may be applied to communication between the network device and the terminal device shown in fig. 1.

As shown in fig. 3, the frequency offset compensation method includes the following steps:

s301, the terminal device obtains a first frequency offset.

Wherein the first frequency offset is one of candidate frequency offsets of a plurality of candidate frequency offsets, in which a synchronization signal and a broadcast channel block (SSB) has been successfully decoded. The plurality of candidate frequency offsets are determined by the terminal device according to a frequency interval, and a frequency interval between two adjacent frequency offsets in the plurality of candidate frequency offsets is smaller than a sub-carrier space (SCS).

In the embodiment of the present application, the frequency interval may be a frequency difference between two adjacent frequency points for blind detection of the SSB. It should be noted that there is no other frequency point for blind detection of SSB between two adjacent frequency points for blind detection of SSB. For example, the frequency bins for blind detection of SSB include frequency bin a1 through frequency bin a 4. Wherein, the frequency point a1< frequency point a2< frequency point A3< frequency point a4, the frequency point a1 and the frequency point a2 are adjacent frequency points, the frequency point a2 and the frequency point A3 are adjacent frequency points, and the frequency point A3 and the frequency point a4 are two adjacent frequency points. The frequency interval is the frequency difference between bin a2 and bin a1, or between bin A3 and bin a2, or between bin a4 and bin A3.

Specifically, the frequency interval may be determined according to the following equation (1):

-π≤2πf_d≤π； (1)

wherein f is_dFor doppler frequency offset, T denotes a distance between OFDM symbols of two reference signals, i.e., a distance between OFDM symbols of two complete broadcast channels (PBCH), where T is 2 Ts and s is a symbol length of OFDM.

It can be obtained from the above equation (1) that the frequency interval satisfies the following equation (2):

|f_d|≤1/2*2*T_s； (2)

wherein, | f_dAnd | is a frequency interval.

For example, if the subcarrier spacing is 120kHz, then the frequency spacing can be calculated to be ≦ 28kHz, i.e., the actually determined frequency spacing is less than or equal to | f_dFor example, 25 kHz.

In a possible design, in step S301, the terminal device obtains the first frequency offset, which may include step 1 to step 3.

Step 1, the terminal equipment acquires a plurality of candidate frequency offsets according to the frequency intervals.

Illustratively, the terminal device executes the step 1 in a process of establishing a connection with the network device, such as a process of entering a coverage area of the network device from an area without network coverage or a process of switching the terminal device from a power-off state to a power-on state. For example, after the terminal device is powered on, the above step 1 may be performed. That is to say, in the process of establishing connection once, the terminal device performs frequency sweeping according to the frequency interval, and further determines a plurality of candidate frequency offsets.

Illustratively, the terminal device may determine the products of different frequency offset coefficients and frequency intervals as a candidate frequency offset, thereby obtaining a plurality of candidate frequency offsets. The frequency offset coefficient is an integer and can be used for indicating the deviation degree of a frequency point relative to a central frequency point.

For example, if the determined frequency interval is 25kHz and the frequency offset is less than 500kHz, the candidate frequency offsets may be n × 25kHz, where n is an integer and | n × 25kHz | <500 kHz.

It can be understood that the 500kHz is the maximum possible frequency offset between the low-orbit satellite and the terminal device when the network device is the low-orbit satellite and the orbit and the speed of the low-orbit satellite are relatively determined. The 500kHz is used as an example only, and the maximum possible frequency offset between the network device and the terminal device may be other values for different network devices with different speeds, orbits, etc., such as medium orbit satellites, high orbit satellites, or aircraft, etc.

And 2, the terminal equipment decodes the SSB according to each candidate frequency offset.

Illustratively, the terminal device decodes the SSBs according to a plurality of candidate frequency offsets determined by frequency sweeping in the process of establishing a connection last time.

Taking a Primary Carrier Component (PCC) in the communication system shown in fig. 4 as an example, the subcarrier interval of the primary carrier is 120kHz, the center frequency point is 28GHz, and if the determined frequency interval is 25kHz, the candidate frequency offsets are: -3 × 25kHz, -2 × 25kHz, -25kHz, 0kHz, 25kHz, 2 × 25kHz and 3 × 25kHz, the terminal device can then decode SSBs individually at the frequency points 28GHz-3 × 25kH, 28GHz-2 × 25kHz, 28GHz-1 × 25kHz, 28GHz +1 × 25kHz, 28GHz +2 × 25kHz and 28GHz +3 × 25 kHz.

And 3, the terminal equipment determines one of the candidate frequency offsets of the SSB which is successfully decoded as a first frequency offset.

That is, the successfully decoded SSB is a plurality of candidate frequency offsets determined by the frequency sweep during the last connection establishment process of the device. Taking the first connection establishment after the terminal device is powered on as an example, successfully decoding the candidate frequency offset of the SSB is the frequency offset corresponding to the frequency point of the SSB during the frequency sweeping process of the first connection establishment.

Still taking the frequency offset shown in fig. 4 as an example, if the SSB is successfully decoded at the frequency point corresponding to the frequency offset of 1 × 25kHz, it may be determined that the first frequency offset is 1 × 25 kHz.

In another possible design, the terminal device may determine candidate frequency offsets one by one, attempt to decode SSB according to each candidate frequency offset after determining each candidate frequency offset, and then select one of the candidate frequency offsets that are successfully decoded by SSB as the first frequency offset.

Optionally, the determining, by the terminal device, one of the candidate frequency offsets for successfully decoding the SSB as the first frequency offset may include: the terminal device determines, as the first frequency offset, a candidate frequency offset corresponding to an SSB with the best signal quality, such as the SSB with the largest received power and/or the SSB with the largest signal to interference plus noise ratio (SINR), among the successfully decoded SSBs.

In the embodiment of the present application, the first frequency offset is an integer multiple of a frequency interval, that is, a coarse frequency offset.

Therefore, the SSB with the best signal quality and/or the candidate frequency offset corresponding to the SSB of the channel with the largest SINR are determined as the first frequency offset, so that the influence of interference signals can be reduced, and the more accurate first frequency offset can be obtained, thereby further improving the decoding success rate of downlink signals.

It can be understood that, in the embodiment of the present application, in the decoding process, if one candidate frequency offset can successfully decode the SSB, the candidate frequency offset may be determined as the first candidate frequency offset. For example, the candidate frequency offset for which the first SSB decoding is successful may be used as the first frequency offset. Therefore, blind detection processes can be reduced, resource overhead can be reduced, and detection efficiency can be improved.

For example, if in the first mode, the SSB can be successfully decoded according to the frequency point corresponding to the candidate frequency offset 2 × 25kHz, the first frequency offset is 2 × 25kHz, that is, 50 kHz.

It should be noted that, in the embodiment of the present application, the network device may further send a common signal, where the common signal includes an SSB.

Optionally, a Residual Minimum System Information (RMSI) may also be included in the common signal.

S302, the terminal device performs frequency offset compensation according to the first frequency offset.

In a possible design, the terminal device may adjust a clock frequency of a crystal oscillator of the terminal device according to the first frequency offset, and receive a downlink common signal, such as RMSI, or a downlink channel, such as a Physical Downlink Control Channel (PDCCH) or a Physical Downlink Shared Channel (PDSCH), after adjusting the clock frequency of the crystal oscillator, so as to implement frequency offset compensation. Or, the terminal device may compensate the received downlink common signal, such as RMSI, or the downlink channel, such as PDCCH or PDSCH, according to the first frequency offset, so as to implement frequency offset compensation.

Illustratively, if the terminal device needs to receive the common signals except the SSB in the common signal, the clock frequency of the crystal oscillator of the terminal device may be adjusted according to the first frequency offset to perform frequency offset compensation, so that the terminal device may receive the common signals except the SSB in the common signal, such as the RMSI, according to the frequency of the crystal oscillator after adjusting the clock frequency. Or, the terminal device compensates other received common signals except the SSB, such as RMSI, according to the first frequency offset, thereby implementing frequency offset compensation.

Or, if the terminal device needs to receive other common signals except the SSB in the common signal, and/or a downlink channel, such as a PDSCH or a PDCCH, the terminal device may adjust the clock frequency of the crystal oscillator according to the first frequency offset, and the terminal device may receive other common signals except the SSB in the common signal, such as an RMSI, and/or a downlink channel, such as a PDSCH or a PDCCH, after adjusting the clock frequency of the crystal oscillator, thereby implementing the frequency offset compensation. Or, the terminal device compensates the received common signals except the SSB, such as the RMSI, and/or the downlink channel, such as the PDSCH or the PDCCH, according to the first frequency offset, thereby implementing the frequency offset compensation.

In one possible design, the frequency offset compensation method shown in fig. 3 may further include step 4.

And 4, the terminal equipment acquires a second frequency offset according to the reference signal corresponding to the SSB.

And the second frequency deviation is smaller than the frequency interval, namely the second frequency deviation is fine frequency deviation.

As for the method for determining the second frequency offset, reference may be made to a method for determining a frequency offset in a terrestrial network, which is not described herein again.

In this case, in the above S302, the performing, by the terminal device, frequency offset compensation according to the first frequency offset may include: and the terminal equipment performs frequency offset compensation according to the first frequency offset and the second frequency offset.

Illustratively, the terminal device may determine a sum of the first frequency offset and the second frequency offset as a total frequency offset, and perform frequency offset compensation according to the total frequency offset. For example, if the first frequency offset is 25kHz and the second frequency offset is 1kHz, the total frequency offset is 26kHz, and the terminal device performs frequency offset compensation according to 26 kHz.

It can be understood that the implementation principle of the terminal device performing the frequency offset compensation according to the first frequency offset and the second frequency offset is similar to the implementation principle of performing the frequency offset compensation according to the first frequency offset, for example, the terminal device may adjust the clock frequency of the crystal oscillator according to the total frequency offset, and receive the downlink signal, such as the RMSI, or the downlink channel, such as the PDCCH or the PDSCH, after adjusting the clock frequency of the crystal oscillator. Alternatively, the terminal device may compensate the received downlink signal, such as RMSI, or a downlink channel, such as PDCCH or PDSCH, according to the total frequency offset.

Therefore, the terminal equipment can perform more fine frequency offset compensation and further reduce the frequency offset of the downlink signal, thereby further improving the decoding success rate of the downlink signal.

Based on the frequency offset compensation method shown in fig. 3, the terminal device may determine a plurality of candidate frequency offsets according to the frequency interval, determine, as the first frequency offset, a candidate frequency offset that can successfully decode the SSB among the plurality of candidate frequency offsets, and then perform frequency offset compensation according to the first frequency offset, where the frequency interval is smaller than the subcarrier interval, so that frequency sweeping according to the subcarrier interval may be avoided, the granularity of frequency sweeping may be reduced, so as to improve the accuracy of frequency offset compensation of the downlink signal, thereby reducing the influence of the frequency offset on the downlink signal, and improving the decoding success rate of the downlink data.

Exemplarily, fig. 5 is a second flowchart of a frequency offset compensation method provided in the embodiment of the present application. The frequency offset compensation method includes S501 to S502.

S501, the terminal device obtains a third frequency offset.

The third bias is determined according to the first ephemeris information and the position of the terminal device, and the first ephemeris information includes one or more of the following items: semi-major axis (semi-major axis) of satellite, eccentricity (eccentricity), Inclination of orbit (Inclination of orbit), ascension of orbit (right approach of the ascension), Argument of vicinity (orientation of vicinity), Argument of vicinity (Mean average at reference time) and reference time (Mean average at reference time).

In this embodiment, when the first ephemeris information is implemented specifically, the semimajor axis may be replaced by a square root of the semimajor axis of the satellite, that is, a square root of the semimajor axis. In this case, as shown in table 1, the parameters related to the first ephemeris information may be divided into orbital plane parameters (orbital plane parameters) and satellite level parameters (satellite level parameters). The position of the terminal device may be determined based on GNSS, and for the method for determining the position of the terminal device, reference may be made to a method for determining the position of the terminal device in the prior art, which is not described herein again.

In a possible design, in step S501, the obtaining, by the terminal device, the third frequency offset may include: and the terminal equipment acquires a third frequency offset according to the first ephemeris information and the position of the terminal equipment.

Illustratively, the terminal device may obtain the third frequency offset according to the position of the terminal device, the first ephemeris information, and the center frequency point of the network device. The central frequency point may be obtained by the terminal device from the network device, or may be stored locally.

TABLE 1

For the sake of understanding the above S501, the network device is further described as a satellite.

Specifically, the terminal device may obtain the elevation angle of the terminal device according to the current time and the first ephemeris information of the network device (i.e., serving satellite) providing the communication service for the terminal device. The terminal device may further obtain the satellite ground altitude according to the first ephemeris information, and then, the terminal device may determine the third frequency offset according to the following formula (3) and formula (4).

f_d(t)＝f_c·ω_sat·R_E·cos(θ_UE(t))/c； (3)

Wherein f is_d(t) is the third frequency offset, f_cIs the center frequency, omega, of the network device_satIs the satellite orbital altitude, R_EIs the radius of the earth, t is the current time, θ_UE(t) is the elevation angle of the terminal device at time t, c is the propagation velocity of the electromagnetic wave, G is the gravity constant, M_EIs the mass of the earth, h_satIs the satellite ground height. Illustratively, G may be 6.67.10^-11Newton square meter per square kilogram (newton square meter per square kilogram, Nm2/kg2), M_EMay be 5.98 x 10²⁴Kilogram (kilogram, kg).

Regarding the implementation of the elevation angle of the terminal device or the satellite ground height, reference may be made to a specific implementation manner of the elevation angle of the terminal device or the satellite ground height in the prior art, which is not described herein again.

Optionally, in this embodiment of the present application, the frequency offset compensation method shown in fig. 5 may further include: the terminal device determines a network device that provides a service for the terminal device.

For example, the terminal device may determine a network device, such as the serving satellite described above, that provides a service for the terminal device according to the GNSS information, the current time and ephemeris information of different satellites. As to the specific implementation manner of the network device that the terminal device determines to provide the service for the terminal device, reference may be made to the specific implementation manner of determining the service satellite in the prior art, which is not described herein again.

And S502, the terminal equipment performs downlink frequency offset compensation according to the third frequency offset.

In a possible design, the terminal device may adjust a clock frequency of a crystal oscillator of the terminal device according to the third frequency offset, and receive a downlink common signal, such as SSB or RMSI, and/or a downlink channel, such as PDCCH or PDSCH, after adjusting the clock frequency of the crystal oscillator, thereby implementing frequency offset compensation. Or, the terminal device may compensate the received downlink common signal, such as the SSB or the RMSI, and/or the downlink channel, such as the PDCCH or the PDSCH, according to the third frequency offset, thereby implementing the frequency offset compensation.

In one possible design, the frequency offset compensation method shown in fig. 5 may further include steps 5 to 7.

And step 5, the network equipment sends the SSB to the terminal equipment.

And step 6, the terminal equipment decodes the SSB according to the third frequency offset.

And the third frequency offset is frequency offset determined according to the first ephemeris information and the position of the terminal equipment, namely coarse frequency offset.

Illustratively, the terminal device may perform a decoding operation on the third frequency offset-compensated SSB.

Therefore, the terminal device performs frequency offset compensation on the SSB according to the third frequency offset, and based on the SSB decoding after the frequency offset compensation, the influence of the frequency offset on the SSB can be reduced, so that the decoding success rate of the SSB can be improved.

Optionally, the frequency offset compensation method shown in fig. 5 may further include step 7.

And 7, the terminal equipment acquires a fourth frequency offset according to the reference signal corresponding to the SSB.

Wherein the fourth frequency offset is less than the third frequency offset. That is, the fourth frequency offset is a fine frequency offset.

For example, the reference information corresponding to the SSB may be a demodulation reference signal (DMRS) in the PBCH.

In this case, in the above S502, the performing, by the terminal device, downlink frequency offset compensation according to the third frequency offset may include: and the terminal equipment performs downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset.

Illustratively, the terminal device may determine a sum of the third frequency offset and the fourth frequency offset as a total frequency offset, and perform frequency offset compensation according to the total frequency offset. For example, if the third frequency offset is 20kHz and the fourth frequency offset is 1kHz, the total frequency offset is 21kHz, and the terminal device performs frequency offset compensation according to 21 kHz.

It can be understood that the implementation principle of the terminal device performing the frequency offset compensation according to the third frequency offset and the fourth frequency offset is similar to the implementation principle of performing the frequency offset compensation according to the third frequency offset, for example, the terminal device may adjust the clock frequency of the crystal oscillator according to the total frequency offset, and receive the downlink signal, such as the SSB or the RMSI, or the downlink channel, such as the PDCCH or the PDSCH, after adjusting the clock frequency of the crystal oscillator. Alternatively, the terminal device may compensate the received downlink signal, such as SSB or RMSI, or the downlink channel, such as PDCCH or PDSCH, according to the total frequency offset.

Therefore, the terminal equipment can perform finer frequency offset compensation, and further reduce the influence of the frequency offset on the downlink signal, thereby further improving the decoding success rate of the downlink signal.

For implementation of the fourth frequency offset, reference may be made to the specific implementation principle of the second frequency offset in the frequency offset compensation method shown in fig. 3, which is not described herein again.

In one possible design, the frequency offset compensation method shown in fig. 5 may further include step 8 and step 9.

And 8, the network equipment sends the auxiliary system information, and the terminal equipment receives the auxiliary system information.

And the secondary system information carries second ephemeris information. The second ephemeris information may include one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite.

In the embodiment of the present application, the secondary system information may be a common signal other than the SSB in the downlink common signal, such as RMSI or SIB 2.

Illustratively, the terminal device may receive the auxiliary system information after adjusting the clock frequency of the crystal oscillator according to the third frequency offset, so as to perform frequency offset compensation on the auxiliary system information. Or, the terminal device may compensate the auxiliary system information according to the third frequency offset, so as to perform frequency offset compensation on the auxiliary system information. Therefore, after the terminal device performs frequency offset compensation on the secondary system information, the secondary system information can be decoded to obtain the second ephemeris information.

And 9, the terminal equipment updates the first ephemeris information according to the second ephemeris information.

Therefore, the terminal equipment updates the first ephemeris information according to the received second ephemeris information, and can determine the third frequency offset according to the real-time ephemeris information of the satellite under the condition that the satellite moves, so that the error of the third frequency offset caused by the position change of the satellite is reduced, the accuracy of frequency offset compensation is further improved, and the decoding success rate of the downlink signal is further improved.

Based on the frequency offset compensation method shown in fig. 5, the terminal device may obtain the third frequency offset according to the first ephemeris information and the position of the terminal device, and then perform downlink frequency offset compensation according to the third frequency offset, so that the influence of the frequency offset on the downlink signal may be reduced, for example, the terminal device may decode the downlink signal based on the frequency point after the frequency offset compensation, so as to improve the decoding success rate of the downlink signal.

Exemplarily, fig. 6 is a third schematic flowchart of a frequency offset compensation method provided in the embodiment of the present application. As shown in fig. 6, the frequency offset compensation method includes:

s601, the network device obtains a fifth frequency offset according to the third ephemeris information and the geographic information.

Wherein the third calendar information includes one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. The geographic information is used to indicate the location of the coverage area of the network device.

For example, the third ephemeris information may be implemented by referring to the above specific implementation manner of the first ephemeris information in fig. 5, and details are not described here again. It is understood that the third ephemeris information may be stored locally by the network device, or may be obtained by the network device from the core network or other network devices.

In this embodiment, the coverage area of the network device may be a coverage area of a beam (beam) of the network device on the ground (hereinafter, referred to as a coverage area of the beam). The location of the coverage area of the network device may be a location within the coverage area of one beam of the network device. Illustratively, the location of the coverage area of the network device may be a center point of the coverage area of the beam. Fig. 7 is a schematic diagram illustrating a location of a coverage area of a network device according to an embodiment of the present application. As shown in fig. 7, if the coverage area of the beam 1 of the network device, such as a satellite, is a circular area, the location of the coverage area of the network device may be the center of the circular area, i.e., the location of point P0.

Alternatively, the location of the coverage area of the network device may be a plurality of locations within the coverage area of the beam. Taking fig. 7 as an example, the location of the coverage area of the network device may be the location of point P1, the location of point P2, and the location of point P3.

In the embodiment of the present application, reference may be made to the specific implementation manner of S501 in the embodiment shown in fig. 5, and details are not described here. S601 in this embodiment is different from S501 in the embodiment shown in fig. 5 in that S601 in this embodiment corresponds to replacing the location of the terminal device in S501 with the location of the coverage area of the network device.

S602, the network device sends the SSB according to the fifth frequency offset, and the terminal device receives the SSB.

In one possible design, the frequency offset compensation method shown in fig. 6 may further include step 10.

And step 10, the network equipment sends the auxiliary system information or the downlink control signaling according to the fifth frequency offset.

And the auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset. In the embodiment of the present application, the secondary system information may be a common signal other than the SSB in the downlink common signal, such as RMSI or SIB 2.

Illustratively, the network device may adjust the clock frequency of the crystal oscillator according to the fifth frequency offset, and then send the auxiliary system information or the downlink control signaling after adjusting the clock frequency of the crystal oscillator. Or, the network device may compensate the auxiliary system information according to the fifth frequency offset, and then send the auxiliary system information or the downlink control signaling.

In this case, after decoding the secondary system information, the terminal device may adjust a crystal oscillator on the terminal device according to the fifth frequency offset, and then receive a downlink signal or a downlink channel, such as a PDSCH or a PDCCH, after adjusting the crystal oscillator. Therefore, the network equipment can complete the frequency offset compensation of the downlink common signal, and the terminal equipment side completes the frequency offset compensation of the downlink data or the downlink channel.

In the embodiment of the application, the fifth frequency offset is a frequency offset determined according to ephemeris information and geographic information, that is, a coarse frequency offset, so that the auxiliary system information indicates the terminal device to perform frequency offset compensation according to the fifth frequency offset, each terminal device can perform coarse frequency offset compensation on other downlink signals or downlink channels except for the SSB and the auxiliary system information according to the corresponding fifth frequency offset, and therefore, the clock frequency of the crystal oscillator can be prevented from being frequently adjusted when the network device sends data signals to different terminal devices, thereby reducing the overhead of the network device, and reducing the time for adjusting the clock frequency of the crystal oscillator, thereby improving the communication efficiency.

In one possible design, the frequency offset compensation method shown in fig. 6 may further include step 11.

And step 11, the network device sends signals except the SSB in the downlink signals according to the fifth frequency offset. The downlink signals, other than the SSB signals, may include one or more of the following: RMSI, Other System Information (OSI), paging (paging), a signal corresponding to a PDSCH in a downlink data channel, a signal corresponding to a PDCCH in a downlink control channel, and a channel state information-reference signal (CSI-RS) in a downlink pilot signal, a phase reference signal (TRS), a Phase Tracking Reference Signal (PTRS), and the like. That is, the network device performs frequency offset compensation on common information except for the SSB in the downlink control signaling, the downlink data signal, or the downlink common information.

Illustratively, when the network device transmits the data signal, the clock frequency of the crystal oscillator is adjusted according to the fifth frequency offset, and then the data signal or the data channel, such as the PDSCH or the PDCCH, is transmitted. Or, when the network device transmits the data signal, the network device compensates the downlink data or the downlink channel, such as the PDSCH or the PDCCH, according to the fifth frequency offset, and then transmits the downlink data or the downlink channel.

Therefore, the network equipment realizes the coarse frequency offset compensation of the downlink data signal, and can simplify the operation of the terminal equipment, thereby improving the decoding efficiency of the terminal equipment.

Based on the frequency offset compensation method shown in fig. 6, the network device may obtain the fifth frequency offset according to the third ephemeris information and the geographic information, and send the SSB according to the fifth frequency offset, so that the SSB frequency offset may be compensated in advance to reduce the frequency offset of the SSB reaching the terminal device, thereby improving the decoding success rate of the SSB.

The frequency offset compensation method of the embodiment of the application can perform frequency compensation on the downlink common channel and the downlink data channel, thereby completing the downlink access process of the terminal equipment.

After the downlink access process is completed, the uplink access process can be further completed. For example, the uplink access procedure may be completed according to the frequency offset compensation method shown in fig. 8 or fig. 9. This is explained in detail below with reference to fig. 8 to 9.

Exemplarily, fig. 8 is a fourth schematic flowchart of a frequency offset compensation method provided in the embodiment of the present application. As shown in fig. 8, the frequency offset compensation method includes:

s801, the network equipment acquires the time advance.

For the convenience of distinction, in this embodiment, the first time advance is used to represent the time advance obtained by the network device.

Wherein the timing advance is related to a coverage area of the network device; the time advance is used for the terminal equipment to send signals to the network equipment.

In one possible design, the acquiring, by the network device, the first time advance may include: and the network equipment acquires the first time lead according to the position of the network equipment and the position of the coverage area. In other words, the first time advance is determined according to the location of the network device and the location of the coverage area.

Illustratively, the first time advance may be obtained according to a location of the network device, a location of the coverage area, and a propagation speed of the electromagnetic wave. For example, the distance between the location of the network device and the location of the coverage area may be obtained according to the location of the network device and the location of the coverage area, and then the distance between the location of the network device and the location of the coverage area is divided by the propagation speed of the electromagnetic wave, and then divided by 2, so as to obtain the first time advance.

In this embodiment, the coverage area of the network device may be a coverage area of a beam (beam) of the network device on the ground (hereinafter, referred to as a coverage area of the beam). In this case, the network device may sequentially calculate a first timing advance according to each location of the coverage area, and send the first timing advance to the terminal device. In this case, if the network device cannot successfully decode the data from the terminal device, the network device may adopt the position of the next coverage area and calculate a first time advance until the first time advance that the network device can successfully decode the uplink signal is obtained. Therefore, the position of the coverage area closer to the actual position of the terminal equipment can be adopted to calculate the first time lead, the accuracy of the first time lead is improved, and the success rate of the uplink access process can be improved.

Regarding the implementation of the location of the coverage area of the network device, reference may be made to a specific implementation manner of the location of the coverage area of the network device in the frequency offset compensation method shown in fig. 6, which is not described herein again.

S802, the network equipment sends the first time advance to the terminal equipment.

In one possible design, the first timing advance may be carried in one or more of the following: secondary system information, such as RMSI, SIB2, or downlink control signaling, such as Radio Resource Control (RRC) signaling.

Therefore, the terminal equipment can receive the time advance before sending the uplink signal and send the signal according to the time advance, so that the signal can arrive at the network equipment on time, and the receiving success rate is improved.

In this embodiment, before S802, the terminal device may further determine an index (index) of the SSB with the best signal quality, for example, an index of the SSB with the largest SINR or the largest received power, and further determine an RMSI corresponding to the SSB according to the index of the SSB, in which case, the terminal device receives the first time advance from the RMSI.

And S803, the terminal equipment sends a signal to the network equipment according to the first time advance.

For example, the network device may send a Physical Random Access Channel (PRACH), a Physical Uplink Shared Channel (PUSCH), or a Physical Uplink Control Channel (PUCCH) to the network device in advance of the first time advance.

Or, the terminal device may send the PRACH to the network device according to the first time advance amount, and then, the terminal device obtains the second time advance amount from the network device, and sends the PUSCH or PDCCH to the network device according to the first time amount and the second time advance amount. It can be understood that there may be a deviation between the position of the coverage area and the actual position of the terminal device, and therefore, in the embodiment of the present application, the first advance is calculated based on the beam center position and the satellite position, the beam center position is different from the actual terminal position, and the position of the satellite also slightly changes, so that the network side may estimate a timing advance based on the PRACH sent by the terminal, and then sends the timing advance to the UE for further fine adjustment. The second timing advance is related to a channel state or a clock state of the terminal device, and the second timing advance may be different if the channel state or the clock state of the terminal device is different.

As for the implementation of the second timing advance, reference may be made to a specific implementation of the timing advance of the terminal device in the ground network in the prior art, which is not described herein again.

Based on the frequency offset compensation method shown in fig. 8, the network device obtains the first time advance, and sends the first time advance to the terminal device, where the first time advance is related to a coverage area of the network device. In this way, the network device may determine the first time advance based on the coverage area of the network device, for example, the network device may use the position in the coverage area as the position of the terminal device, so that the GNSS information of the terminal device may be avoided from being used to obtain the frequency offset, and the applicability is improved.

Exemplarily, fig. 9 is a fifth flowchart of a frequency offset compensation method provided in the embodiment of the present application. As shown in fig. 9, the frequency offset compensation method includes:

s901, the network equipment acquires the time advance.

For convenience of distinction, in this embodiment, the time advance obtained by the network device is represented by the third time advance.

In one possible design, the obtaining, by the network device, the third timing advance may include: and the network equipment acquires the third time advance according to the position of the network equipment and the position of the coverage area of the network equipment. In other words, the third timing advance is determined according to the location of the network device and the location of the coverage area of the network device.

Regarding the location of the coverage area of the network device, reference may be made to the location of the coverage area of the network device in the frequency offset compensation method shown in fig. 6, which is not described herein again.

As to a specific implementation manner of the third time advance, reference may be made to the specific implementation manner of the first time advance in fig. 8, and details are not described here.

And S902, the terminal equipment sends a signal, and the network equipment receives the signal according to the third time advance.

In one possible design, the receiving, by the network device, a signal according to the timing advance may include: the network device receives the signal from the terminal device with a lag of the third timing advance.

For example, if the terminal device starts to transmit an uplink signal to the network device at time T2, and the transmission delay between the terminal device and the base station is TA2, the uplink signal arrives at the network device at time T2+ TA2, that is, the network device receives an uplink signal from the terminal device, such as PRACH, PUSCH, or PDCCH, at time T2+ TA 2.

Therefore, the network equipment can receive the signal on time when the signal reaches the network equipment, and the receiving success rate can be improved.

It can be understood that, in this embodiment, the terminal device may perform fine adjustment of the time according to a manner of adjusting the time advance by the ground network, which is not described herein again.

Based on the frequency offset compensation method shown in fig. 9, the network device obtains a third timing advance, and receives a signal from the terminal device according to the third timing advance, where the third timing advance is related to a coverage area of the network device. In this way, the network device may determine the third timing advance based on the coverage area of the network device, for example, the network device may use the position in the coverage area as the position of the terminal device, so that the GNSS information of the terminal device may be avoided from being used to obtain the frequency offset, and the applicability is improved.

The frequency offset compensation method provided by the embodiment of the present application is described in detail above with reference to fig. 3 to 9. The following describes in detail a frequency offset compensation apparatus for performing the frequency offset compensation method provided by the embodiments of the present application with reference to fig. 10 to 14.

Exemplarily, fig. 10 is a schematic structural diagram of a frequency offset compensation apparatus provided in an embodiment of the present application. As shown in fig. 10, the frequency offset compensation apparatus 1000 includes: an acquisition module 1001 and a compensation module 1002. For convenience of explanation, fig. 10 shows only the main components of the frequency offset compensation apparatus 1000.

In some embodiments, the apparatus 1000 for frequency offset compensation may be applied to the communication system shown in fig. 2, and performs the functions of the terminal device in the method for frequency offset compensation shown in fig. 3.

The obtaining module 1001 is configured to obtain a first frequency offset.

Wherein the first frequency offset is one of the candidate frequency offsets of the plurality of candidate frequency offsets, in which the synchronization signal and the broadcast channel block SSB have been successfully decoded. The candidate frequency offsets are determined by the terminal device according to the frequency interval, and the frequency interval between two adjacent frequency offsets in the candidate frequency offsets is smaller than the subcarrier interval.

The compensation module 1002 is configured to perform frequency offset compensation according to the first frequency offset.

In a possible design, the obtaining module 1001 is configured to obtain a plurality of candidate frequency offsets according to a frequency interval, and decode SSBs according to each candidate frequency offset. An obtaining module 1001, configured to determine one of candidate frequency offsets for successfully decoding the SSB as a first frequency offset.

Optionally, the obtaining module 1001 is configured to determine, as the first frequency offset, a candidate frequency offset corresponding to an SSB with the best signal quality in the successfully decoded SSBs.

In a possible design, the obtaining module 1001 is further configured to obtain the second frequency offset according to a reference signal corresponding to the SSB. Wherein the second frequency offset is less than the frequency interval.

The compensation module 1002 is configured to perform frequency offset compensation according to the first frequency offset and the second frequency offset.

Alternatively, the obtaining module 1001 and the compensating module 1002 may be integrated into one module, such as a processing module (not shown in fig. 10). Wherein, the processing module is used to implement the processing function of the frequency offset compensation apparatus 1000. It is to be understood that the processing modules involved in the apparatus 1000 for frequency offset compensation may be implemented by a processor or a processor-related circuit component, and may be a processor or a processing unit.

Optionally, the apparatus 1000 for frequency offset compensation may further include a storage module (not shown in fig. 10) storing a program or instructions. The program or instructions, when executed by the processing module, enable the apparatus 1000 to perform the method of frequency offset compensation shown in fig. 3.

Optionally, the frequency offset compensation apparatus 1000 may further include a transceiver module. The transceiver module is used to implement the transmitting function and the receiving function of the frequency offset compensation apparatus 1000. It should be understood that the transceiver module may be implemented by a transceiver or transceiver-related circuit component, and may be a transceiver or transceiver unit.

It should be noted that the frequency offset compensation apparatus 1000 may be a terminal device, a chip (system) or other component or assembly that may be disposed in the terminal device, or an apparatus including the terminal device, which is not limited in this application.

In addition, the technical effect of the frequency offset compensation apparatus 1000 may refer to the technical effect of the frequency offset compensation method shown in fig. 3, and is not described herein again.

In other embodiments, the apparatus 1000 for frequency offset compensation may be applied to the communication system shown in fig. 2 to perform the functions of the terminal device in the method for frequency offset compensation shown in fig. 5.

An obtaining module 1001 is configured to obtain a third frequency offset. The first frequency offset is determined according to the first ephemeris information and the position of the terminal device, and the first ephemeris information includes: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite.

The compensation module 1002 is configured to perform downlink frequency offset compensation according to the third frequency offset.

In a possible design, the obtaining module 1001 is configured to obtain the third frequency offset according to the first ephemeris information and the location of the terminal device.

Optionally, the compensation module 1002 is further configured to decode the SSB according to a third frequency offset.

Further, the obtaining module 1001 is configured to obtain a fourth frequency offset according to a reference signal corresponding to the SSB. Wherein the fourth frequency offset is less than the first frequency offset.

The compensation module 1002 is configured to perform downlink frequency offset compensation according to the first frequency offset and the fourth frequency offset.

In one possible design, the obtaining module 1001 is further configured to receive secondary system information.

And the secondary system information carries second ephemeris information. The obtaining module 1001 is further configured to update the first ephemeris information according to the second ephemeris information. The second ephemeris information includes: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite.

Optionally, the apparatus 1000 for frequency offset compensation may further include a storage module (not shown in fig. 10) storing a program or instructions. The program or instructions, when executed by the processing module, enable the apparatus 1000 to perform the method of frequency offset compensation shown in fig. 5.

In addition, the technical effect of the frequency offset compensation apparatus 1000 may be the technical effect of the frequency offset compensation method shown in fig. 5, which is not described herein again.

Exemplarily, fig. 11 is a schematic structural diagram of a frequency offset compensation apparatus provided in the embodiment of the present application. As shown in fig. 11, the frequency offset compensation apparatus 1100 includes: a processing module 1101 and a transceiver module 1102. For convenience of explanation, fig. 11 shows only the main components of the frequency offset compensation apparatus 1100.

In some embodiments, the apparatus 1100 may be applied to the communication system shown in fig. 2 to perform the functions of the network device in the method of frequency offset compensation shown in fig. 6.

The processing module 1101 is configured to obtain a fifth frequency offset according to the third ephemeris information and the geographic information.

Wherein the third calendar information includes: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite. The geographic information is used to indicate the location of the coverage area of the network device.

The transceiver module 1102 is configured to send a synchronization signal and a downlink broadcast channel block SSB according to the fifth frequency offset.

In a possible design, the transceiver module 1102 is further configured to send the auxiliary system information or the downlink control signaling according to a fifth frequency offset; and the auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset.

Optionally, the transceiver module 1102 is further configured to send, according to the fifth frequency offset, signals other than the SSB in the downlink signal.

Optionally, the transceiver module 1102 may include a receiving module and a transmitting module (not shown in fig. 11). The transceiver module 1102 is configured to implement a transmitting function and a receiving function of the frequency offset compensation apparatus 1100.

Optionally, the apparatus 1100 may further include a storage module (not shown in fig. 11) storing programs or instructions. The program or instructions, when executed by the processing module 1101, enable the apparatus 1100 to perform the method of frequency offset compensation shown in fig. 6.

It is to be understood that the processing module 1101 involved in the frequency offset compensation apparatus 1100 may be implemented by a processor or a processor-related circuit component, and may be a processor or a processing unit; the transceiver module 1102 may be implemented by a transceiver or transceiver-related circuit component, and may be a transceiver or transceiver unit.

It should be noted that the frequency offset compensation apparatus 1100 may be a network device, a chip (system) or other component or assembly that can be disposed in the network device, or an apparatus including the network device, which is not limited in this application.

In addition, the technical effect of the frequency offset compensation apparatus 1100 can refer to the technical effect of the frequency offset compensation method shown in fig. 6, and is not described herein again.

In other embodiments, the frequency offset compensation apparatus 1100 may be applied to the communication system shown in fig. 2 to perform the functions of the network device in the frequency offset compensation method shown in fig. 8.

A processing module 1101, configured to obtain a timing advance. Wherein the timing advance is related to a coverage area of the network device. A transceiver module 1102 configured to send the timing advance. The time advance is used for the terminal equipment in the coverage area of the network equipment to send signals to the network equipment.

In one possible design, the processing module 1101 is configured to obtain a timing advance according to a location of a network device and a location of a coverage area.

Optionally, the apparatus 1100 may further include a storage module (not shown in fig. 11) storing programs or instructions. The program or instructions, when executed by the processing module 1101, enable the frequency offset compensation apparatus 1100 to perform the functions of the network device in the frequency offset compensation method shown in any one of fig. 6.

In addition, the technical effect of the frequency offset compensation apparatus 1100 may refer to the technical effect of the frequency offset compensation method shown in any one of fig. 8, and is not described herein again.

In other embodiments, the frequency offset compensation apparatus 1100 may be applied to the communication system shown in fig. 2 to perform the functions of the network device in the frequency offset compensation method shown in fig. 9.

Among them, a processing module 1101 and a transceiver module 1102. The processing module 1101 is configured to obtain a timing advance. Wherein the timing advance is related to a coverage area of the network device. The transceiver module 1102 is configured to receive a signal according to the timing advance.

In one possible design, the processing module 1101 is configured to obtain the timing advance according to a location of the network device and a location of a coverage area of the network device.

In one possible design, the transceiver module 1102 is configured to delay receiving a signal from a terminal device by a time advance.

Optionally, the apparatus 1100 may further include a storage module (not shown in fig. 11) storing programs or instructions. The program or instructions, when executed by the processing module 1101, enable the frequency offset compensation apparatus 1100 to perform the functions of the network device in the frequency offset compensation method shown in fig. 9.

It should be noted that the frequency offset compensation apparatus 1100 may be the network device shown in fig. 2, or may be a chip (system) or other component or assembly disposed in the network device, or an apparatus including the network device, which is not limited in this embodiment of the present application.

In addition, the technical effect of the frequency offset compensation apparatus 1100 may refer to the technical effect of the frequency offset compensation method shown in any one of fig. 9, and is not described herein again.

Exemplarily, fig. 12 is a schematic structural diagram three of a frequency offset compensation apparatus provided in the embodiment of the present application. As shown in fig. 12, the frequency offset compensation apparatus 1200 may include an indoor baseband unit (BBU) 1201 and an Active Antenna Unit (AAU) 1202. The BBU1201 can be used to perform functions of data computation and processing. The AAU1202 may be configured to implement a transmitting function and a receiving function of the frequency offset compensation apparatus.

It should be noted that, the frequency offset compensation apparatus 1200 may be the network device shown in fig. 2, or may be a chip (system) or other component or assembly disposed in the network device, or an apparatus including the network device, which is not limited in this embodiment of the present application.

In addition, the technical effect of the frequency offset compensation apparatus 1200 can refer to the technical effect of the frequency offset compensation method shown in any one of fig. 6, fig. 8, or fig. 9, and is not described herein again.

Exemplarily, fig. 13 is a schematic structural diagram of a frequency offset compensation apparatus provided in an embodiment of the present application. As shown in fig. 13, the frequency offset compensation apparatus 1300 includes: a receiving module 1301 and a sending module 1302. For convenience of explanation, fig. 13 shows only the main components of the frequency offset compensation apparatus 1300.

The frequency offset compensation apparatus 1300 can be applied to the communication system shown in fig. 2, and performs the functions of the terminal device in the frequency offset compensation method shown in fig. 8.

The receiving module 1301 is configured to receive a timing advance.

Wherein the timing advance is related to a coverage area of the network device.

A sending module 1302, configured to send a signal to a network device according to the timing advance.

Alternatively, the receiving module 1301 and the transmitting module 1302 may be integrated into one module, such as a transceiver module (not shown in fig. 13). The transceiver module is used to implement the sending function and the receiving function of the frequency offset compensation apparatus 1300.

Optionally, the apparatus 1300 may further include a processing module (shown by a dashed box in fig. 13). The processing module is configured to implement a processing function of the frequency offset compensation apparatus 1300.

Optionally, the apparatus 1300 may further include a storage module (not shown in fig. 13) storing programs or instructions. The program or the instructions, when executed by the receiving module 1301, enable the apparatus 1300 for frequency offset compensation to perform the functions of the terminal apparatus in the method for frequency offset compensation shown in any one of fig. 8.

It is to be appreciated that the processing modules involved in the apparatus 1300 for frequency offset compensation may be implemented by a processor or a processor-related circuit component, and may be a processor or a processing unit; the transceiver module may be implemented by a transceiver or transceiver-related circuit component, and may be a transceiver or transceiver unit.

It should be noted that the frequency offset compensation apparatus 1300 may be a terminal device, a chip (system) or other component or assembly that may be disposed in the terminal device, or an apparatus including the terminal device, which is not limited in this application.

In addition, the technical effect of the frequency offset compensation apparatus 1300 may refer to the technical effect of the frequency offset compensation method shown in any one of fig. 8, and is not described herein again.

Exemplarily, fig. 14 is a schematic structural diagram five of a frequency offset compensation apparatus provided in the embodiment of the present application. The frequency offset compensation device may be a terminal device or a network device, or may be a chip (system) or other component or assembly that may be disposed in the terminal device or the network device. As shown in fig. 14, the frequency offset compensation apparatus 1400 may include a processor 1401. Optionally, frequency offset compensation apparatus 1400 may further comprise memory 1402 and/or transceiver 1403. Wherein the processor 1401 is coupled to the memory 1402 and the transceiver 1403, such as may be connected by a communication bus.

The following describes the components of the frequency offset compensation apparatus 1400 in detail with reference to fig. 14:

the processor 1401 is a control center of the frequency offset compensation apparatus 1400, and may be a single processor or a collective term for multiple processing elements. For example, processor 1401 is one or more Central Processing Units (CPUs), and may be an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present application, such as: one or more microprocessors (digital signal processors, DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

Alternatively, processor 1401 may perform various functions of frequency offset compensation apparatus 1400 by running or executing software programs stored in memory 1402, and invoking data stored in memory 1402.

In particular implementations, processor 1401 may include one or more CPUs such as CPU0 and CPU1 shown in fig. 14 as one example.

In one embodiment, frequency offset compensation apparatus 1400 may also comprise a plurality of processors, such as processor 1401 and processor 1404 shown in fig. 14. Each of these processors may be a single-Core Processor (CPU) or a multi-Core Processor (CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The memory 1402 is configured to store a software program for executing the scheme of the present application, and is controlled by the processor 1401 to execute the software program.

Alternatively, memory 1402 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 1402 may be integrated with the processor 1401, or may exist independently, and is coupled to the processor 1401 through an interface circuit (not shown in fig. 14) of the frequency offset compensation apparatus 1400, which is not specifically limited in this embodiment.

A transceiver 1403 for communicating with other frequency offset compensation devices. For example, frequency offset compensation apparatus 1400 is a terminal device, and transceiver 1403 may be used for communicating with a network device or another terminal device. As another example, where frequency offset compensation apparatus 1400 is a network device, transceiver 1403 may be used for communicating with a terminal device or with another network device.

Optionally, the transceiver 1403 may include a receiver and a transmitter (not separately shown in fig. 14). Wherein the receiver is configured to implement a receive function and the transmitter is configured to implement a transmit function.

Optionally, the transceiver 1403 may be integrated with the processor 1401, or may be independent, and is coupled to the processor 1401 through an interface circuit (not shown in fig. 14) of the frequency offset compensation apparatus 1400, which is not specifically limited in this embodiment of the present invention.

It should be noted that the structure of the frequency deviation compensation apparatus 1400 shown in fig. 14 does not constitute a limitation of the frequency deviation compensation apparatus, and an actual frequency deviation compensation apparatus may include more or less components than those shown in the drawings, or may combine some components, or may be arranged in different components.

In addition, the technical effect of the frequency offset compensation apparatus 1400 may refer to the technical effect of the frequency offset compensation method described in the foregoing method embodiment, and is not described herein again.

The embodiment of the application provides a communication system. The communication system comprises the one or more terminal devices and one or more network devices.

It should be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), and the processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It will also be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of Random Access Memory (RAM) are available, such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware (e.g., circuitry), firmware, or any combination thereof. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer instructions or the computer program are loaded or executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more collections of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In addition, the "/" in this document generally indicates that the former and latter associated objects are in an "or" relationship, but may also indicate an "and/or" relationship, which may be understood with particular reference to the former and latter text.

In the present application, "at least one" means one or more, "a plurality" means two or more. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including 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 steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A frequency offset compensation method is applied to a terminal device, and the method comprises the following steps:

acquiring a first frequency offset; wherein the first frequency offset is one of candidate frequency offsets of a plurality of candidate frequency offsets, in which the synchronization signal and the broadcast channel block SSB have been successfully decoded; the candidate frequency offsets are determined by the terminal equipment according to a frequency interval, and the frequency interval between two adjacent frequency offsets in the candidate frequency offsets is smaller than a subcarrier interval;

and performing frequency offset compensation according to the first frequency offset.

2. The frequency offset compensation method of claim 1, wherein said obtaining a first frequency offset comprises:

obtaining the candidate frequency offsets according to the frequency intervals;

decoding the SSB individually according to each candidate frequency offset;

determining one of the candidate frequency offsets at which the SSB is successfully decoded as the first frequency offset.

3. The frequency offset compensation method of claim 2, wherein the determining one of the candidate frequency offsets for successful decoding of the SSB as the first frequency offset comprises:

and determining the candidate frequency offset corresponding to the SSB with the best signal quality in the successfully decoded SSBs as a first frequency offset.

4. The method of frequency offset compensation according to any of claims 1-3, further comprising:

acquiring a second frequency offset according to the reference signal corresponding to the SSB; wherein the second frequency offset is less than the frequency interval;

the frequency offset compensation according to the first frequency offset includes:

and performing frequency offset compensation according to the first frequency offset and the second frequency offset.

5. A frequency offset compensation method is applied to a terminal device, and the method comprises the following steps:

acquiring a third frequency offset; wherein the third bias is determined according to first ephemeris information and the position of the terminal device, and the first ephemeris information includes one or more of: the semi-major axis, eccentricity, orbit inclination, ascension at the intersection point, amplitude angle at the near place, mean angle at the near point and reference time of the satellite;

and performing downlink frequency offset compensation according to the third frequency offset.

6. The frequency offset compensation method of claim 5, wherein said obtaining a third frequency offset comprises:

and acquiring the third frequency offset according to the first ephemeris information and the position of the terminal equipment.

7. The method of frequency offset compensation of claim 6, further comprising:

and decoding the SSB according to the third frequency bias.

8. The method of frequency offset compensation of claim 7, further comprising:

acquiring a fourth frequency offset according to the reference signal corresponding to the SSB; wherein the fourth frequency offset is less than the third frequency offset;

the performing of the downlink frequency offset compensation according to the third frequency offset includes:

and performing downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset.

9. The method of frequency offset compensation according to any of claims 5-8, further comprising:

receiving auxiliary system information; the auxiliary system information carries second ephemeris information;

updating the first ephemeris information according to the second ephemeris information; the second ephemeris information includes one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite.

10. A frequency offset compensation method is applied to a network device, and the method comprises the following steps:

acquiring a fifth frequency offset according to the third ephemeris information and the geographic information; wherein the third calendar information includes one or more of: the semi-major axis, eccentricity, orbit inclination, ascension at the intersection point, amplitude angle at the near place, mean angle at the near point and reference time of the satellite; the geographic information is used for indicating the position of a coverage area of the network equipment;

and sending a synchronization signal and a downlink broadcast channel block (SSB) according to the fifth frequency offset.

11. The method of frequency offset compensation of claim 10, further comprising:

sending auxiliary system information or downlink control signaling according to the fifth frequency offset; and the auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset.

12. The method of frequency offset compensation of claim 10, further comprising:

and sending signals except SSB in the downlink signals according to the fifth frequency offset.

13. A frequency offset compensation method is applied to a network device, and the method comprises the following steps:

acquiring a time advance; wherein the timing advance is related to a coverage area of the network device;

transmitting a timing advance; wherein the time advance is used for a terminal device in the coverage area of the network device to transmit a signal to the network device.

14. The frequency offset compensation method of claim 13, wherein the obtaining the timing advance comprises:

and acquiring the time advance according to the position of the network equipment and the position of the coverage area.

15. The method of claim 13 or 14, wherein the timing advance is carried in one or more of: secondary system information block, or downlink control signaling.

16. A frequency offset compensation method is applied to a terminal device, and the method comprises the following steps:

receiving a timing advance; wherein the timing advance is related to a coverage area of a network device;

and sending a signal to the network equipment according to the time advance.

17. The frequency offset compensation method of claim 16, wherein the timing advance is determined based on a location of the network device and a location of a coverage area of the network device.

18. The frequency offset compensation method of claim 16 or 17, wherein the timing advance is carried in one or more of: secondary system information block, or downlink control signaling.

19. An apparatus for frequency offset compensation, the apparatus comprising: an acquisition module and a compensation module;

the obtaining module is used for obtaining a first frequency offset; wherein the first frequency offset is one of candidate frequency offsets of a plurality of candidate frequency offsets, in which the synchronization signal and the broadcast channel block SSB have been successfully decoded; the candidate frequency offsets are determined by the terminal equipment according to the frequency interval, and the frequency interval between two adjacent frequency offsets in the candidate frequency offsets is smaller than the subcarrier interval;

and the compensation module is used for performing frequency offset compensation according to the first frequency offset.

20. The frequency deviation compensating apparatus of claim 19,

the obtaining module is configured to obtain the multiple candidate frequency offsets according to the frequency interval;

the obtaining module is configured to decode the SSB according to each candidate frequency offset;

the obtaining module is configured to determine one of the candidate frequency offsets for successfully decoding the SSB as the first frequency offset.

21. The frequency deviation compensating apparatus of claim 20,

the obtaining module is configured to determine, as the first frequency offset, a candidate frequency offset corresponding to the SSB with the best signal quality in the successfully decoded SSBs.

22. The frequency deviation compensation apparatus of any of claims 19-21,

the obtaining module is further configured to obtain a second frequency offset according to the reference signal corresponding to the SSB; wherein the second frequency offset is less than the frequency interval;

and the compensation module is used for performing frequency offset compensation according to the first frequency offset and the second frequency offset.

23. An apparatus for frequency offset compensation, the apparatus comprising: an acquisition module and a compensation module;

the acquisition module is used for acquiring a third frequency offset; the third bias is determined according to first ephemeris information and the position of the terminal equipment, and the first ephemeris information includes one or more of the following items: the semi-major axis, eccentricity, orbit inclination, ascension at the intersection point, amplitude angle at the near place, mean angle at the near point and reference time of the satellite;

and the compensation module is used for performing downlink frequency offset compensation according to the third frequency offset.

24. The frequency deviation compensating apparatus of claim 23,

and the obtaining module is configured to obtain the third frequency offset according to the first ephemeris information and the position of the terminal device.

25. The frequency deviation compensating apparatus of claim 24,

the compensation module is further configured to decode the SSB according to the third frequency offset.

26. The frequency deviation compensating apparatus of claim 25,

the acquiring module is configured to acquire a fourth frequency offset according to the reference signal corresponding to the SSB; wherein the fourth frequency offset is less than the third frequency offset;

and the compensation module is used for performing downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset.

27. The frequency deviation compensation apparatus of any of claims 23-26,

the acquisition module is also used for receiving auxiliary system information; the auxiliary system information carries second ephemeris information;

the acquisition module is further configured to update the first ephemeris information according to the second ephemeris information; the second ephemeris information includes one or more of: the semi-major axis, eccentricity, orbital inclination, ascension, perigee amplitude, mean perigee angle and reference time of the satellite.

28. An apparatus for frequency offset compensation, the apparatus comprising: the device comprises a processing module and a transmitting-receiving module;

the processing module is used for acquiring a fifth frequency offset according to the third ephemeris information and the geographic information; wherein the third calendar information includes one or more of: the semi-major axis, eccentricity, orbit inclination, ascension at the intersection point, amplitude angle at the near place, mean angle at the near point and reference time of the satellite; the geographic information is used for indicating the position of a coverage area of the network equipment;

and the transceiver module is configured to send a synchronization signal and a downlink broadcast channel block SSB according to the fifth frequency offset.

29. The frequency deviation compensating apparatus of claim 28,

the transceiver module is further configured to send auxiliary system information or a downlink control signaling according to the fifth frequency offset; and the auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset.

30. The frequency deviation compensating apparatus of claim 28,

the transceiver module is further configured to obtain, according to the fifth frequency offset, signals other than the SSB in the downlink signal.

31. An apparatus for frequency offset compensation, the apparatus comprising: the device comprises a processing module and a transmitting-receiving module;

the processing module is used for acquiring a time advance; wherein the timing advance is related to a coverage area of a network device;

the receiving and sending module is used for sending the time advance; wherein the time advance is used for a terminal device in the coverage area of the network device to transmit a signal to the network device.

32. The frequency deviation compensating apparatus of claim 31,

the processing module is configured to obtain the time advance according to the location of the network device and the location of the coverage area.

33. The apparatus of claim 31 or 32, wherein the timing advance is carried in one or more of: secondary system information block, or downlink control signaling.

34. An apparatus for frequency offset compensation, the apparatus comprising: the device comprises a receiving module and a sending module;

the receiving module is used for receiving the time advance; wherein the timing advance is related to a coverage area of a network device;

and the sending module is used for sending a signal to the network equipment according to the time advance.

35. The frequency offset compensation apparatus of claim 34, wherein the timing advance is determined according to a location of the network device and a location of a coverage area of the network device.

36. The frequency offset compensation apparatus of claim 34 or 35, wherein the timing advance is carried in one or more of: secondary system information block, or downlink control signaling.

37. A frequency offset compensation apparatus, comprising: a processor coupled with a memory;

the processor, configured to execute the computer program stored in the memory, so as to cause the frequency offset compensation apparatus to perform the frequency offset compensation method according to any one of claims 1 to 4, or 5 to 9, or 10 to 12, or 13 to 15, or 16 to 18.

38. A frequency offset compensation apparatus, comprising: a processor and an interface circuit; wherein the content of the first and second substances,

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;

the processor is configured to execute the code instructions to perform the method of any one of claims 1-4, or 5-9, or 10-12, or 13-15, or 16-18.

39. A frequency deviation compensation apparatus, comprising a processor and a transceiver for information exchange between the frequency deviation compensation apparatus and other frequency deviation compensation apparatuses, wherein the processor executes program instructions to perform the frequency deviation compensation method according to any one of claims 1 to 4, or 5 to 9, or 10 to 12, or 13 to 15, or 16 to 18.

40. A computer-readable storage medium comprising a computer program or instructions which, when run on a computer, cause the computer to perform the frequency offset compensation method of any one of claims 1-4, or 5-9, or 10-12, or 13-15, or 16-18.

41. A computer program product, the computer program product comprising: computer program or instructions which, when run on a computer, cause the computer to perform the frequency offset compensation method as claimed in any one of claims 1-4, or 5-9, or 10-12, or 13-15, or 16-18.