CN114244418B

CN114244418B - Frequency offset compensation method and device

Info

Publication number: CN114244418B
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: 2023-06-06
Anticipated expiration: 2041-11-12
Also published as: CN116886151A; WO2023083204A1; CN114244418A

Abstract

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 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 a plurality of candidate frequency offsets, which have been successfully decoded for the synchronization signal and the broadcast channel block SSB. The plurality of 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 plurality of 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 disclosure relates to the field of communications, and in particular, to a frequency offset compensation method and apparatus.

Background

Satellite communication is one of non-terrestrial network (non-terrestrial network, NTN) communication, has characteristics of wide coverage, being not easily damaged by natural disasters or external forces relative to terrestrial network communication, and can be used for providing communication services for areas that cannot be covered by terrestrial networks. In satellite communication systems, satellites move at high speeds relative to the ground, and thus, a large doppler shift with terminal equipment occurs.

Currently, uplink frequency offset compensation can be performed based on the terminal device. Specifically, the terminal device may obtain doppler frequency offset according to a global navigation satellite system (global navigation satellite system, GNSS) and ephemeris information of the satellite, such as semi-long axis, eccentricity, orbital inclination, ascending and intersecting point right ascent, near-site amplitude angle, flat and near-site angle, reference time, and the like, so as to perform frequency offset compensation according to the doppler frequency offset in advance when transmitting an uplink signal.

However, the above-mentioned uplink frequency offset compensation scheme can only perform frequency offset compensation on the uplink signal, while the downlink signal still has a large frequency offset between the synchronization signal and the broadcast channel block (synchronization signal and physical broadcast channel block, SSB), which may result in 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 above purpose, the present application adopts the following technical scheme:

in a first aspect, a method for 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 a plurality of candidate frequency offsets, which have been successfully decoded for the synchronization signal and the broadcast channel block SSB. The plurality of 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 plurality of 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 in the first aspect, the terminal device can determine a plurality of candidate frequency offsets according to the frequency intervals, and determine the candidate frequency offset which can successfully decode the SSB in the plurality of candidate frequency offsets as the first frequency offset, and further perform frequency offset compensation according to the first frequency offset, wherein the frequency interval is smaller than the subcarrier interval, so that frequency sweeping according to the subcarrier interval can be avoided, the granularity of the frequency sweeping can be reduced, the accuracy of frequency offset compensation of the downlink signal can be improved, the influence of the frequency offset on the downlink signal can be reduced, and the decoding success rate of the downlink data can be improved.

In addition, in the embodiment of the application, the first frequency offset can be determined without using the position information of the terminal equipment, so that the applicability can be improved.

In a 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 interval. 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 SSB as a first frequency offset. The first frequency offset is an integer multiple of the frequency interval, namely 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, the influence of the interference signal can be reduced, and the more accurate first frequency offset is obtained, so that the decoding success rate of the downlink signal is further improved.

In a possible design, the frequency offset compensation method provided in the first aspect may further include: and the terminal equipment acquires a 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 finer frequency offset compensation, and further reduce the frequency offset of the downlink signal, so that the decoding success rate of the downlink signal is further improved.

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. Wherein the third frequency offset is determined according to the first ephemeris information and a position of the terminal device, the first ephemeris information including one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. 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 can obtain the third frequency offset according to the first ephemeris information and the position of the terminal device, and further perform downlink frequency offset compensation according to the third frequency offset, so that the influence of the frequency offset on the downlink signal can be reduced, for example, the terminal device can decode the downlink signal based on the frequency point after the frequency offset compensation, and thus the decoding success rate of the downlink signal can be improved.

In a possible design, the terminal device obtains a third frequency offset, which 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 synchronization signal and the broadcast channel block SSB according to the third frequency offset. The third frequency offset is a frequency offset determined according to the first ephemeris information and the position of the terminal equipment, namely a coarse frequency offset. Therefore, the terminal equipment performs frequency offset compensation on the SSB according to the third frequency offset, and decodes the SSB based on the frequency offset compensation, so that the influence of the frequency offset on the SSB can be reduced, and the decoding success rate of the SSB can be improved.

Further, the frequency offset compensation method provided in the second aspect may further include: and the terminal equipment acquires a fourth frequency offset according to the reference signal corresponding to the SSB. The fourth frequency offset is smaller than the third frequency offset, that is, 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 frequency offset on the downlink signal, so that the decoding success rate of the downlink signal is further improved.

In a possible design, the frequency offset compensation method provided in the second aspect may further include: the terminal device receives the auxiliary system information. The auxiliary system information carries second ephemeris information. The first ephemeris information is updated based on the second ephemeris information. The second ephemeris information may comprise one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. 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 satellite position change 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 for 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 ephemeris information comprises one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. The geographic information is used to indicate the location of the coverage area of the network device. The network device transmits the synchronization signal and the 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 can 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 can be compensated in advance, the frequency offset of the SSB reaching the terminal device is reduced, and the decoding success rate of the SSB is improved.

In a possible design, the frequency offset compensation method provided in the third aspect may further include: and the network equipment transmits auxiliary system information or downlink control signaling according to the fifth frequency offset. The auxiliary system information is used for indicating the terminal equipment to carry out 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, namely 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, 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, the clock frequency of the crystal oscillator can be prevented from being frequently adjusted when the network equipment sends data signals to different terminal equipment, the cost of the network equipment is reduced, the time for adjusting the clock frequency of the crystal oscillator is shortened, and the communication efficiency is improved.

In a possible design, the frequency offset compensation method provided in the third aspect may further include: and the network equipment transmits signals except 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, namely the coarse frequency offset, so that the network equipment realizes coarse frequency offset compensation of the downlink data signals, the operation of the terminal equipment can be simplified, and the decoding efficiency of the terminal equipment is improved.

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

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 the coverage area of the network device. In this way, the network device may determine the time advance based on the coverage area of the network device, for example, the network device may use the location in the coverage area as the location of the terminal device, so that the use of GNSS information of the terminal device to obtain the frequency offset may be avoided, and the applicability is improved.

In one possible design, the network device may obtain the time advance, which may include: the network device obtains the time advance according to the position of the network device 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 embodiment, the time advance can be carried in one or more of the following: secondary system information blocks, 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 for compensating for frequency offset is provided. The frequency offset compensation method comprises the following steps: the terminal device receives the time advance. Wherein the time advance is related to a coverage area of the network device. And the terminal equipment sends signals to the network equipment according to the time advance.

In one possible embodiment, the time advance can be determined from the position of the network device and the position of the coverage area of the network device.

In one possible embodiment, the time advance can be carried in one or more of the following: secondary system information blocks, or downlink control signaling.

In addition, the technical effects of the frequency offset compensation method according to the fifth aspect may refer to the technical effects of the frequency offset compensation method according to the fourth aspect, which are not described herein.

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

In one possible design, the network device obtaining the time advance may include: the network device obtains the time advance according to the position of the network device and the position of the coverage area of the network device.

In one possible design, the network device may receive the signal according to the time advance, and may include: the network device receives the signal from the terminal device with a lag time lead. Thus, the network device can receive the signal on time when the signal arrives at the network device, thereby improving the success rate of the receiving.

In a seventh aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device comprises: the device comprises an acquisition module and a compensation module. The acquisition module is used for acquiring the first frequency offset. Wherein the first frequency offset is one of a plurality of candidate frequency offsets, which have been successfully decoded for the synchronization signal and the broadcast channel block SSB. The plurality of 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 plurality of 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 the frequency interval, and decode the SSB according to each candidate frequency offset. And the acquisition module is used for determining one of the candidate frequency offsets for successfully decoding the SSB as a first frequency offset.

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

In one 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 smaller than the frequency spacing. 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 offset compensation device.

Optionally, the frequency offset compensation apparatus according to the seventh aspect may further include a storage module, where the storage module stores a program or instructions. When the processing module executes the program or the instruction, the frequency offset compensation device is enabled to execute the frequency offset compensation method described in the first aspect.

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

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

In addition, the technical effects of the frequency offset compensation apparatus described in the seventh aspect may refer to the technical effects of the frequency offset compensation method described in the first aspect, which are not described herein.

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 acquisition module is used for acquiring the third frequency offset. Wherein the third frequency offset is determined according to the first ephemeris information and a position of the terminal device, the first ephemeris information including one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. And the compensation module is used for carrying out downlink frequency offset compensation according to the third frequency offset.

In one 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 synchronization signal and the broadcast channel block SSB according to the third frequency offset.

Further, an 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 carrying out downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset.

In one possible design, the acquiring module is further configured to receive the auxiliary system information. The auxiliary system information carries second ephemeris information. The acquisition module is further used for updating the first ephemeris information according to the second ephemeris information. The second ephemeris information may comprise one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time.

Optionally, the frequency offset compensation apparatus according to the eighth aspect may further include a storage module, where the storage module stores a program or instructions. The program or instructions, when executed by the processing module, cause the frequency offset compensation arrangement to perform the frequency offset compensation method of the second aspect.

Optionally, the frequency offset compensation apparatus of the eighth aspect may further include a transceiver module. The receiving and transmitting module is used for realizing the sending function and the receiving function of the frequency offset 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 components or assemblies that may be disposed in the terminal device, or may be an apparatus including the terminal device, which is not limited in this application.

In addition, the technical effects of the frequency offset compensation apparatus described in the eighth aspect may refer to the technical effects of the frequency offset compensation method described in the second aspect, which are not described herein.

A ninth aspect provides a frequency offset compensation apparatus, the frequency offset compensation apparatus comprising: the device comprises a processing module and a receiving and transmitting 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 ephemeris information comprises one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. The geographic information is used to indicate the location of the coverage area of the network device. And the receiving and transmitting module is used for transmitting the synchronous signals and the broadcast channel block SSB according to the fifth frequency offset.

In one possible design, the transceiver module is further configured to send the auxiliary system information or the downlink control signaling according to the fifth frequency offset. 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 signals other than SSB in the downlink signals according to the fifth frequency offset.

Alternatively, the transceiver module may include a receiving module and a transmitting module. The transceiver module is configured to implement a transmitting function and a receiving function of the frequency offset compensation device described in the ninth aspect.

Optionally, the frequency offset compensation apparatus according to the ninth aspect may further include a storage module, where the storage module stores a program or instructions. The program or instructions, when executed by the processing module, cause the frequency offset compensation arrangement to perform the frequency offset compensation method of the third aspect.

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

In addition, the technical effects of the frequency offset compensation apparatus described in the ninth aspect may refer to the technical effects of the frequency offset compensation method described in the third aspect, which are not described herein.

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

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

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

Alternatively, the transceiver module may include a receiving module and a transmitting module. The transceiver module is configured to implement a transmitting function and a receiving function of the frequency offset compensation device described in the tenth aspect.

Optionally, the frequency offset compensation apparatus according to the tenth aspect may further include a storage module, where the storage module stores a program or instructions. The program or instructions, when executed by the processing module, cause the frequency offset compensation arrangement to perform the frequency offset compensation method of the fourth aspect.

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

In addition, the technical effects of the frequency offset compensation apparatus according to the tenth aspect may refer to the technical effects of the frequency offset compensation method according to the fourth aspect, which are not described herein.

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

In one possible embodiment, the time advance is determined from the position of the network device and the position of the coverage area of the network device.

Alternatively, the transceiver module may include a receiving module and a transmitting module. The transceiver module is configured to implement a transmitting function and a receiving function of the frequency offset compensation device described in 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. The program or instructions, when executed by the processing module, cause the frequency offset compensation arrangement to perform the frequency offset compensation method of the fifth aspect.

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

In addition, the technical effects of the frequency offset compensation apparatus described in the eleventh aspect may refer to the technical effects of the frequency offset compensation method described in the fifth aspect, which are not described herein.

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

In one possible design, the processing module is configured to obtain the time 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 the signal from the terminal device with a delay time advance.

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

Optionally, the frequency offset compensation apparatus according to the twelfth aspect may further include a storage module, where the storage module stores a program or instructions. The program or instructions, when executed by the processing module, cause the frequency offset compensation arrangement to perform the frequency offset compensation method of the sixth aspect.

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

In addition, the technical effects of the frequency offset compensation apparatus described in the twelfth aspect may refer to the technical effects of the frequency offset compensation method described in the sixth aspect, which are not described herein.

In a thirteenth aspect, a frequency offset compensation apparatus is provided. The frequency offset compensation device is used for executing the frequency offset compensation method 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 aspect, the second aspect, or the fifth aspect, or the network device according to any one of the third aspect, the fourth aspect, or the sixth aspect, or a chip (system) or other part or component that may 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 a corresponding module, unit, or means (means) for implementing the frequency offset compensation method according to any one of the first to sixth aspects, where the module, unit, or means may be implemented by hardware, software, or implemented by executing corresponding software by hardware. The hardware or software includes one or more modules or units for performing the functions involved in the frequency offset compensation method described above.

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 one possible implementation manner, the frequency offset compensation apparatus according to the fourteenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be adapted to communicate with other frequency offset compensation arrangements as described in the fourteenth aspect.

In one possible configuration, the frequency offset compensation device 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 aspect, the second aspect, or the fifth aspect, or the network device according to any one of the third aspect, the fourth aspect, or the sixth aspect, or a chip (system) or other part or component that may 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, the processor configured to execute a computer program stored in the memory, to cause the frequency offset compensation apparatus 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 one possible implementation manner, the frequency offset compensation apparatus according to the fifteenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be adapted to communicate with other frequency offset compensation arrangements as described in the fifteenth aspect.

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 aspect, the second aspect, or the fifth aspect, or the network device according to any one of the third aspect, the fourth aspect, or the sixth aspect, or a chip (system) or other component or assembly that may 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, comprising: a processor and a memory; the memory is configured to store a computer program that, when executed by the processor, causes the frequency offset compensation arrangement to perform the frequency offset compensation method according to any one of the implementation manners of the first aspect to the sixth aspect.

In one possible implementation manner, the frequency offset compensation apparatus according to the sixteenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be adapted for use in a frequency offset compensation arrangement as described in the sixteenth aspect in communication with other frequency offset compensation arrangements.

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

A seventeenth aspect provides a frequency offset compensation apparatus, including: a processor; the processor is configured to execute the frequency offset compensation method according to any implementation manner of the first to sixth aspects according to a computer program after being coupled to the memory and reading the computer program in the memory.

In one possible implementation manner, the frequency offset compensation apparatus according to the seventeenth aspect may further include a transceiver. The transceiver may be a transceiver circuit or an interface circuit. The transceiver may be adapted for use in a frequency offset compensation arrangement as described in the seventeenth aspect in communication with other frequency offset compensation arrangements.

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 aspect, the second aspect, or the fifth aspect, or the network device according to any one of the third aspect, the fourth aspect, or the sixth aspect, or a chip (system) or other component or assembly that may be disposed in the terminal device or the network device, or an apparatus that includes the terminal device or the network device.

In addition, the technical effects of the frequency offset compensation apparatus described in the thirteenth aspect to the seventeenth aspect may refer to the technical effects of the frequency offset compensation method described in the first aspect to the sixth aspect, and are not described herein again.

In an eighteenth aspect, a processor is provided. Wherein the processor is 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 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 instructions, when run on a computer, cause the computer to perform the method of frequency offset compensation as described in any one of the possible implementations of the first to sixth aspects.

In a twenty-first aspect, a computer program product is provided, comprising a computer program or instructions which, when run on a computer, cause the computer to perform the method of frequency offset compensation according to any one of the possible implementation manners of the first to sixth aspects.

Drawings

Fig. 1 is a schematic diagram of a relationship between frequency offset and 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 schematic flow chart of a frequency offset compensation method according to an embodiment of the present application;

fig. 4 is a schematic diagram of a candidate frequency offset provided in an embodiment of the present application;

fig. 5 is a second flow chart of a frequency offset compensation method provided in the embodiment of the present application;

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

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

fig. 8 is a flow chart diagram of a frequency offset compensation method provided in an embodiment of the present application;

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

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

Fig. 11 is a schematic structural diagram of a frequency offset compensation device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram III of a frequency offset compensation device provided in an embodiment of the present application;

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

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

Detailed Description

For ease of understanding, the prior art to which this application relates is first described below.

In the current communication system, the terminal device may obtain frequency offset and uplink Time Advance (TA) according to the position information and ephemeris information (such as semi-long axis, eccentricity, orbital inclination, ascending intersection, right ascent, near-place amplitude, near-point angle and reference time) of the terminal device, so as to 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, when the SSB decoding fails, the decoding of the signal other than the SSB cannot be performed. In addition, even if SSB decoding is successful, since the decoding conditions of SSB are relatively loose, if frequency offset estimation is not accurate enough according to SSB, decoding failure of other signals except SSB may be caused. That is, there is a problem that decoding success rate is low for signals other than the downlink signal.

In addition, in the above scheme for acquiring the frequency offset, the location information of the terminal device needs to be determined according to the GNSS, which has a problem of low adaptability.

In addition, the terminal device needs to acquire a Time Advance (TA) according to the location information and the ephemeris information of the terminal device, so as to send the uplink signal in advance. The process of acquiring the time advance is required to rely on a global navigation satellite system (global navigation satellite system, GNSS) to acquire the position of the terminal equipment, and has low applicability.

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 differences in propagation path when one device is moving in a certain direction relative to another device at a certain rate.

For example, in a satellite communication system, a doppler shift occurs between a satellite and a terminal device, and the doppler shift is highly correlated with an elevation angle (elevation angle) of the terminal device and the satellite. In satellite altitude determination, the doppler shift is related to the elevation angle of the terminal device. Taking a satellite with an orbit height of 500 kilometers (km) as an example, the satellite has a flying speed of up to 7.6 kilometers per second (kilometer per second km/s). As shown in fig. 1, the doppler shift may reach 500 kilohertz (kHz) for a terminal device where the satellite is stationary relative to the ground. As the elevation angle of the terminal device increases, the doppler shift decreases. The elevation angle of the terminal equipment is the included angle of a connecting line between the terminal equipment and the satellite relative to the ground.

In this embodiment of the present application, the doppler shift may also be referred to as a doppler shift, for example, may be simply referred to as a frequency shift, and in the following embodiments, the frequency shift is described.

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

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

The technical solution of the embodiments of the present application may be applied to various communication systems, such as a satellite communication system, an internet of vehicles communication system, a 4th generation (4th generation,4G) mobile communication system, such as a long term evolution (long term evolution, LTE) system, a worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, a fifth generation (5th generation,5G) mobile communication system, such as a New Radio (NR) system, and a future communication system, such as a sixth generation (6th generation,6G) mobile communication system.

The present application will present various aspects, embodiments, or features about a system that may include multiple devices, components, modules, etc. 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, combinations of these schemes may also be used.

In addition, in the embodiments of the present application, words such as "exemplary," "for example," and the like are used to indicate an example, instance, or illustration. 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 use of an example is intended to present concepts in a concrete fashion.

In the embodiment of the present application, "information", "signal", "message", "channel", and "signaling" may be used in a mixed manner, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized. "of", "corresponding" and "corresponding" are sometimes used in combination, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized.

In the embodiments of the present application, sometimes subscripts such as W ₁ May be misidentified as a non-subscripted form such as W1, the meaning it is intended to express being consistent when de-emphasizing the distinction.

The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

To facilitate understanding of the embodiments of the present application, a communication system suitable for the embodiments of the present application will be described in detail first with reference to the communication system shown in fig. 2 as an example. Fig. 2 is a schematic diagram of a communication system to which the frequency offset compensation method according to the embodiment of the present application is applicable. As shown in fig. 2, the communication system includes at least one network device 210 (e.g., 210a as shown in fig. 2, or 210a and 210 b) and at least one terminal device 220 (e.g., 220a 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 transceiver function, or a chip system thereof. The network devices include, but are not limited to: satellite, aircraft or unmanned aerial system (unmanned aerial system, UAS). Alternatively, the network device may be a device provided on a satellite, an aircraft, or a UAS and having a wireless transceiving function or a chip system provided on the device. Alternatively, the network device may be an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a baseband unit (BBU), a wireless relay Node, a wireless backhaul Node, a transmission point (transmission and reception point, TRP or transmission point, TP), or the like, and may also be a 5G, such as a gNB in a new radio, NR, system, or a transmission point (TRP or TP), one or a group of base stations (including multiple antenna panels) antenna panels 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 (DU), or the like.

The terminal device 220 is a terminal having a wireless transceiver function and capable of being connected to the communication system, or a chip system provided in the terminal. The terminal device 220 may also be referred to as a satellite television receiver, a user equipment, 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 equipment. 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 (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (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, or the like. The terminal device can also be a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit which are arranged in the vehicle as one or more components or units, and the vehicle can implement the frequency offset compensation method provided by the application through the built-in vehicle-mounted module, the vehicle-mounted component, the vehicle-mounted chip or the 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, the 210a may communicate with the terminal device 220 through a service link (service link), and the 210a may communicate with the connection device 230 through a feeder link (feeder link).

If the network device 210 comprises 210a and 210b as shown in fig. 2, 210a may communicate with the terminal device 210 over a service link, 210a may communicate with 210b over an inter-satellite link (inter satellite link, ISL), and 210b may communicate with the connection device 230 over a feeder link. In this case, 210a may be used to relay signals, 210b may be used to perform codec operations on signals, and so on. For example, after the first signal to be transmitted to the terminal 220 is encoded by the 210b, the encoded first signal is transmitted to the 210a, and the 210a transmits the encoded first signal to the terminal device 220. Alternatively, 210a may receive the second signal from terminal device 220 and send the second signal to 210b, and 210b decodes 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 specific implementation may refer to the following method embodiments, which are not described herein again.

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

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

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

Fig. 3 is a schematic flow chart of a frequency offset compensation method according to an embodiment of the present application. The frequency offset compensation method can be applied to communication between the network equipment and the terminal equipment shown in fig. 1.

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

s301, the terminal equipment acquires a first frequency offset.

Wherein the first frequency offset is one of a plurality of candidate frequency offsets, which have been successfully decoded for the synchronization signal and the broadcast channel block (synchronization signal and physical broadcast channel block, SSB). The plurality of 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 plurality of candidate frequency offsets is smaller than a sub-carrier space (SCS).

In this embodiment, the frequency interval may be a frequency difference between two adjacent frequency points for blind detection of SSB. It should be noted that, no other frequency point for blind detection of SSB exists between two adjacent frequency points for blind detection of SSB. For example, the frequency points for blind detection of SSB include frequency point A1 to frequency point A4. If 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 the frequency point A2 and the frequency point A1, or the frequency difference between the frequency point A3 and the frequency point A2, or the frequency difference between the frequency point A4 and the frequency point A3.

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

-π≤2πf _d ≤π； (1)

wherein f _d For doppler frequency offset, T denotes the distance between OFDM symbols of two reference signals, i.e. the distance between (orthogonal frequency division multiplexing, OFDM) symbols of two complete broadcast channels (physical broadcast channel, PBCH), t=2×ts, s being the symbol length of OFDM.

From the above formula (1), it is possible to obtain a frequency interval satisfying the following formula (2):

|f _d |≤1/2*2*T _s ； (2)

wherein, |f _d And I is the frequency interval.

For example, if the subcarrier spacing is 120kHz, the frequency spacing can be calculated to be 28kHz or less, i.e., the actual determined frequency spacing is less than or equal to |f _d I, for example, 25kHz.

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

Step 1, a terminal device obtains a plurality of candidate frequency offsets according to frequency intervals.

The above step 1 is performed by the terminal device during a connection with the network device, for example, during a period when the terminal device enters a coverage area of the network device from an area without network coverage or during a period when the terminal device is switched from a power-off state to a power-on state. For example, after the terminal device is powered on, step 1 may be performed. That is, in the process of establishing connection at one time, the terminal device sweeps according to the frequency interval, so as to determine a plurality of candidate frequency offsets.

For example, the terminal device may determine products of different frequency offset coefficients and frequency intervals as one 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 one frequency point relative to the central frequency point.

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

It will be appreciated that the 500kHz is the maximum possible frequency offset between the low-orbit satellite and the terminal device in the case where the network device is a low-orbit satellite and the orbit and velocity of the low-orbit satellite are relatively determined. 500kHz is only used as an example, and the maximum possible frequency offset between the network device and the terminal device may be other values for other network devices of 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 SSB according to a plurality of candidate frequency offsets determined by the frequency sweep in the last connection establishment process.

Taking a main carrier (primary carrier component, PCC) in the communication system shown in fig. 4 as an example, the subcarrier spacing of the main carrier is 120kHz, the center frequency point is 28GHz, and if the determined frequency spacing is 25kHz, the plurality of candidate frequency offsets are respectively: -3 x 25kHz, -2 x 25kHz, -25kHz, 0kHz, 25kHz, 2 x 25kHz and 3 x 25kHz, the end device may decode SSB at frequency points 28GHz-3 x 25kHz, 28GHz-2 x 25kHz, 28GHz-1 x 25kHz, 28GHz, 28ghz+1 x 25kHz, 28ghz+2 x 25kHz and 28ghz+3 x 25kHz, respectively.

And step 3, the terminal equipment determines one of the candidate frequency offsets for successfully decoding the SSB as a first frequency offset.

That is, the successfully decoded SSBs are 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 equipment is started as an example, the candidate frequency offset of the SSB can be successfully decoded as the frequency offset corresponding to the frequency point of the SSB in the frequency sweep process of the first connection establishment.

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

In another possible design, the terminal device may determine the candidate frequency offsets one by one, and after determining each candidate frequency offset, attempt to decode the SSB according to the candidate frequency offset, and then select one of the candidate frequency offsets that are successfully decoded by the 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 SSB with the best signal quality, such as the SSB with the largest received power, and/or a candidate frequency offset corresponding to the SSB with the largest signal-to-interference plus noise ratio (signal to interference plus noise ratio, SINR).

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

In this way, 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 the interference signal can be reduced, the more accurate first frequency offset can be obtained, and the decoding success rate of the downlink signal can be further improved.

It can be appreciated that in the embodiment of the present application, if one candidate frequency offset can successfully decode the SSB in the decoding process, the candidate frequency offset may be determined as the first candidate frequency offset. For example, the candidate frequency offset for which the first SSB was successfully decoded may be referred to as the first frequency offset. Thus, blind detection flow can be reduced, resource overhead is reduced, and detection efficiency is 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, 50kHz.

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

Optionally, a residual minimum system message (remaining minimum system information, RMSI) may also be included in the common signal.

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

In one possible design, the terminal device may adjust the clock frequency of the crystal oscillator of the terminal device according to the first frequency offset, and receive the downlink common signal, such as RMSI, or the downlink channel, such as the physical downlink control channel (physical downlink control channel, PDCCH) or the physical downlink shared channel (physical downlink share 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.

For example, if the terminal device needs to receive other common signals except SSB in the common signals, 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 other common signals except SSB in the common signals, such as RMSI, according to the frequency of the crystal oscillator after adjusting the clock frequency. Or the terminal equipment compensates other received public signals except SSB, such as RMSI, according to the first frequency offset, thereby realizing frequency offset compensation.

Or if the terminal device needs to receive other common signals except SSB in the common signals and/or downlink channels, such as PDSCH or 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 SSB in the common signals, such as RMSI, and/or downlink channels, such as PDSCH or PDCCH, after adjusting the clock frequency of the crystal oscillator, so as to implement frequency offset compensation. Or the terminal equipment compensates other public signals except SSB, such as RMSI, and/or downlink channels, such as PDSCH or PDCCH, according to the first frequency offset, thereby realizing frequency offset compensation.

In a 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.

The second frequency offset is smaller than the frequency interval, that is, the second frequency offset is a fine frequency offset.

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

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

The terminal device may determine the 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, the first frequency offset is 25kHz, the second frequency offset is 1kHz, the total frequency offset is 26kHz, and the terminal equipment performs frequency offset compensation according to the 26 kHz.

It can be appreciated that the implementation of the frequency offset compensation by the terminal device according to the first frequency offset and the second frequency offset is similar to the implementation principle of 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 RMSI, or the downlink channel, such as PDCCH or PDSCH, after adjusting the clock frequency of the crystal oscillator. Alternatively, the terminal device may compensate the received downlink signal, such as 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 frequency offset of the downlink signal, so that the decoding success rate of the downlink signal is further improved.

Based on the frequency offset compensation method shown in fig. 3, the terminal device can determine a plurality of candidate frequency offsets according to the frequency interval, and determine the candidate frequency offset which can successfully decode the SSB in the plurality of candidate frequency offsets as a first frequency offset, and further perform frequency offset compensation according to the first frequency offset, wherein the frequency interval is smaller than the subcarrier interval, so that frequency sweep according to the subcarrier interval can be avoided, the granularity of the frequency sweep can be reduced, the accuracy of frequency offset compensation of the downlink signal can be improved, the influence of the frequency offset on the downlink signal can be reduced, and the decoding success rate of the downlink data can be improved.

Fig. 5 is a schematic flow chart diagram of a frequency offset compensation method according to an embodiment of the present application. The frequency offset compensation method includes S501 to S502.

S501, the terminal equipment acquires a third frequency offset.

Wherein the third frequency offset is determined according to the first ephemeris information and a position of the terminal device, the first ephemeris information including one or more of: semi-major axes (semi-major axes), eccentricities (Eccentricity (eccentricity)), orbital inclinations (Inclination angle at reference time (registration)), ascending point barefoots (Longitude of ascending node of orbit plane (right ascension of the ascending node)), near point argument (Argument of perigee (argument of periapsis)), flat point angles (Mean anomaly at reference time (true anomaly and a reference point in time)), and reference times (Ephemeris reference time (the epochs)).

In the embodiment of the present application, when the first ephemeris information is specifically implemented, the square root of the semi-long axis of the satellite, that is, the square root of the semi-long axis may be used instead of the semi-long 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 location of the terminal device may be determined based on GNSS, and the method for determining the location of the terminal device may refer to the method for determining the location of the terminal device in the prior art, which is not described herein.

In a possible design, in 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.

The terminal device may obtain the third frequency offset according to the location of the terminal device, the first ephemeris information, and a center frequency point of the network device. The center frequency point may be acquired from the network device by the terminal device, or may be stored locally.

TABLE 1

To facilitate understanding of S501, the following description will further use the network device 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. the service satellite) that provides the communication service for the terminal device. The terminal device may also obtain 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 _d (t) is a third frequency offset, f _c Omega is the center frequency of the network device _sat For satellite orbit altitude, R _E Is the radius of the earth, t is the current moment, theta _UE (t) the elevation angle of the terminal equipment at the moment t, c is the propagation speed of electromagnetic wave, G is a gravity constant, M _E Is of earth mass, h _sat Is the satellite ground level. Illustratively, G may be 6.67.10 ^-11 Newton square meter per square kilogram (newton square metre per square kilogram, nm2/kg 2), M _E Can be 5.98 x 10 ²⁴ Kilogram (kg).

The implementation of the elevation angle of the terminal device or the satellite ground height may correspond to the specific implementation of the elevation angle of the terminal device or the satellite ground height in the prior art, which is not described herein.

Optionally, in an 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 serves the terminal device.

For example, the terminal device may determine a network device serving the terminal device, such as the serving satellite described above, based on GNSS information, current time of day, and ephemeris information of the different satellites. For the specific implementation manner of the terminal device to determine the network device that provides 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.

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

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

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

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

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

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

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

Therefore, the terminal equipment performs frequency offset compensation on the SSB according to the third frequency offset, and decodes the SSB based on the frequency offset compensation, so that the influence of the frequency offset on the SSB can be reduced, and 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 (demodulation reference signal, DMRS) in the PBCH.

In this case, in S502, 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.

For example, the terminal device may determine the 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, the third frequency offset is 20kHz, the fourth frequency offset is 1kHz, the total frequency offset is 21kHz, and the terminal equipment performs frequency offset compensation according to the 21 kHz.

It can be appreciated that the implementation of the frequency offset compensation by the terminal device according to the third frequency offset and the fourth frequency offset is similar to the implementation principle of 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 SSB, or RMSI, or the downlink channel, such as PDCCH or 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 frequency offset on the downlink signal, so that the decoding success rate of the downlink signal is further improved.

For the 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.

In a 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 auxiliary system information, and the terminal equipment receives the auxiliary system information.

The auxiliary system information carries second ephemeris information. The second ephemeris information may comprise one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time.

In this embodiment of the present application, the auxiliary system information may be a common signal other than SSB, such as RMSI, SIB2, or the like, in the downlink common signal.

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 equipment can compensate the auxiliary system information according to the third frequency offset, so as to compensate the frequency offset of the auxiliary system information. In this way, after the terminal device performs frequency offset compensation on the auxiliary system information, the terminal device can decode from the auxiliary system information 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 satellite position change 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 can obtain the third frequency offset according to the first ephemeris information and the position of the terminal device, and further perform downlink frequency offset compensation according to the third frequency offset, so that the influence of the frequency offset on the downlink signal can be reduced, for example, the terminal device can decode the downlink signal based on the frequency point after the frequency offset compensation, and thus the decoding success rate of the downlink signal can be improved.

Fig. 6 is a schematic flow chart of a frequency offset compensation method according to an embodiment of the present application. As shown in fig. 6, the frequency offset compensation method includes:

and S601, the network equipment acquires a fifth frequency offset according to the third ephemeris information and the geographic information.

Wherein the third ephemeris information comprises one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. The geographic information is used to indicate the location of the coverage area of the network device.

For example, the implementation of the third ephemeris information may refer to the specific implementation of the first ephemeris information in fig. 5, which is not described herein. It will be appreciated that the third ephemeris information may be stored locally by the network device or may be obtained by the network device from a core network, or other network device.

In the embodiment of the present application, the coverage area of the network device may be a coverage area of one 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 a beam of the network device. Illustratively, the location of the coverage area of the network device may be the center point of the coverage area of the beam. Fig. 7 is a schematic diagram of 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, that is, the location of the P0 point.

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 coverage area of the network device may be the position of the P1 point, the position of the P2 point, and the position of the P3 point.

In this embodiment of the present application, the implementation of S601 may refer to the specific implementation of S501 in the embodiment shown in fig. 5, which is not described herein. The difference between S601 in this embodiment and S501 in the embodiment shown in fig. 5 is that in S601 in this embodiment, the position of the terminal device in S501 is replaced with the position of the coverage area of the network device.

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

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

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

The auxiliary system information is used for indicating the terminal equipment to perform frequency offset compensation according to the fifth frequency offset. In this embodiment of the present application, the auxiliary system information may be a common signal other than SSB, such as RMSI, SIB2, or the like, in the downlink common signal.

For example, 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 auxiliary system information, the terminal device may adjust the crystal oscillator on the terminal device according to the fifth frequency offset, and then receive the downlink signal or downlink channel, such as PDSCH or PDCCH, after adjusting the crystal oscillator. Thus, the network device can complete the frequency offset compensation of the downlink public signal, and the terminal device side can complete the frequency offset compensation of the downlink data or the downlink channel.

In the embodiment of the present application, the fifth frequency offset is a frequency offset determined according to ephemeris information and geographical 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, and each terminal device may perform coarse frequency offset compensation on other downlink signals or downlink channels except for SSB and auxiliary system information according to the corresponding fifth frequency offset, so that the clock frequency of the crystal oscillator is 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, so as to improve the communication efficiency.

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

And step 11, the network equipment transmits signals except SSB in the downlink signals according to the fifth frequency offset. Among the downstream signals, signals other than SSBs may include one or more of the following: RMSI, other system information (other system information, OSI), paging (paging), downlink data channel with signals corresponding to PDSCH, downlink control channel PDCCH with signals corresponding to downlink pilot channel with channel state information reference information (CSI-RS), phase reference signals (tracking reference signal, TRS), phase tracking reference information (phase tracking reference signal, PTRS), etc. That is, the network device side performs frequency offset compensation on the downlink control signaling, the downlink data signal, or the common information except SSB in the downlink common information.

Illustratively, when transmitting the data signal, the network device adjusts the clock frequency of the crystal oscillator according to the fifth frequency offset, and then transmits the data signal or the data channel, such as PDSCH or PDCCH. Or when the network device transmits the data signal, compensating downlink data or a downlink channel, such as PDSCH or PDCCH, according to the fifth frequency offset, and then transmitting the downlink data or the downlink channel.

Therefore, the network equipment realizes coarse frequency offset compensation of the downlink data signals, and the operation of the terminal equipment can be simplified, so that the decoding efficiency of the terminal equipment is improved.

Based on the frequency offset compensation method shown in fig. 6, the network device can 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 can be compensated in advance, so that the frequency offset of the SSB reaching the terminal device is reduced, and the decoding success rate of the SSB is improved.

The frequency offset compensation method can carry out frequency compensation on the downlink common channel and the downlink data channel, thereby completing the downlink access flow of the terminal equipment.

After the downlink access procedure is completed, the uplink access procedure can be further completed. For example, the uplink access procedure may be completed according to the following frequency offset compensation method of fig. 8 or fig. 9. The following is a detailed description with reference to fig. 8 to 9.

Fig. 8 is a schematic flow chart diagram of a frequency offset compensation method according to an embodiment of the present application. As shown in fig. 8, the frequency offset compensation method includes:

s801, the network device acquires a time advance.

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

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

In one possible design, the network device obtaining the first time advance may include: the network device obtains a first time advance according to the position of the network device and the position of the coverage area. In other words, the first time advance is determined from the network device based on the location of the network device and the location of the coverage area.

Illustratively, the first time advance may be obtained from a location of the network device, a location of the coverage area, and a propagation speed of the electromagnetic wave. For example, the first time advance may be obtained by obtaining a distance between the location of the network device and the location of the coverage area according to the location of the network device and the location of the coverage area, dividing the distance between the location of the network device and the location of the coverage area by a propagation speed of the electromagnetic wave, and dividing by 2.

In the embodiment of the present application, the coverage area of the network device may be a coverage area of one 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 time advance according to each location of the coverage area, and send the first time 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 use the location of the next coverage area, and calculate a first time advance until the first time advance is obtained, where the network device can successfully decode the uplink signal. Therefore, the position of the coverage area which is closer to the actual position of the terminal equipment can be used for calculating the first time advance, and the accuracy of the first time advance is improved, so that the success rate of the uplink access flow 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.

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

In one possible embodiment, the first time advance may be carried in one or more of the following: secondary system information, such as RMSI, or SIB2, etc., or downlink control signaling, such as radio resource control (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, where the terminal device receives the first time advance from the RMSI.

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

For example, the network device may send a physical random access channel (physical random access channel, PRACH), a physical uplink shared channel (physical uplink share channel, PUSCH), or a physical uplink control channel (physical uplink control channel, PUCCH) to the network device a first time advance.

Or, the terminal device may send the PRACH to the network device in advance according to the first time advance, and then the terminal device acquires the second time advance from the network device, and sends the PUSCH or the PDCCH to the network device in advance according to the first time amount and the second time advance. 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, so in this 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 satellite position also has a small change, so the network side will estimate a timing advance based on the PRACH sent by the terminal, and then issue to the UE to further perform fine adjustment. The second time advance is a time advance related to a channel state or a clock state of the terminal device, and if the channel state or the clock state of the terminal device is different, the second time advance may be different.

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

Based on the frequency offset compensation method shown in fig. 8, the network device obtains a first time advance and sends the first time advance to the terminal device, wherein 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 location in the coverage area as the location of the terminal device, so that the use of GNSS information of the terminal device to obtain the frequency offset may be avoided, and the applicability is improved.

Fig. 9 is a schematic flow chart diagram of a frequency offset compensation method according to an embodiment of the present application. As shown in fig. 9, the frequency offset compensation method includes:

s901, the network device acquires the time advance.

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

In one possible design, the network device obtaining the third time advance may include: and the network equipment acquires a 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 time advance is determined based on 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.

For the specific implementation of the third time advance, reference may be made to the specific implementation of the first time advance in fig. 8, which is not described herein.

S902, the terminal equipment sends signals, and the network equipment receives signals according to the third time advance.

In one possible design, the network device may receive the signal according to the time advance, and may include: the network device receives the signal from the terminal device with a third time advance.

For example, if the terminal device starts to send 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 at time t2+ta2, such as PRACH, PUSCH, or PDCCH.

Thus, the network device can receive the signal on time when the signal arrives at the network device, thereby improving the success rate of the receiving.

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

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

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

Fig. 10 is a schematic structural diagram of a frequency offset compensation apparatus according to 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 ease of illustration, fig. 10 shows only the main components of the frequency offset compensation arrangement 1000.

In some embodiments, the frequency offset compensation apparatus 1000 may be adapted to be used in the communication system shown in fig. 2 to perform the functions of the terminal device in the frequency offset compensation method shown in fig. 3.

The acquiring module 1001 is configured to acquire a first frequency offset.

Wherein the first frequency offset is one of a plurality of candidate frequency offsets, which have been successfully decoded for the synchronization signal and the broadcast channel block SSB. The plurality of 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 plurality of candidate frequency offsets is smaller than the subcarrier interval.

And a compensation module 1002, 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 the frequency interval, and decode the SSB according to each candidate frequency offset. An obtaining module 1001 is configured to determine one of candidate frequency offsets for successfully decoding 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 the SSB with the best signal quality from the SSBs that are successfully decoded.

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 smaller than the frequency spacing.

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

Alternatively, the acquisition module 1001 and the compensation module 1002 may be integrated into one module, such as a processing module (not shown in fig. 10). The processing module is configured to implement a processing function of the frequency offset compensation apparatus 1000. It should be appreciated that the processing modules involved in frequency offset compensation apparatus 1000 may be implemented by a processor or processor-related circuit components, which may be a processor or processing unit.

Optionally, frequency offset compensation apparatus 1000 may further include a memory module (not shown in fig. 10) having stored thereon programs or instructions. When executed by the processing module, causes the frequency offset compensation apparatus 1000 to perform the frequency offset compensation method illustrated in fig. 3.

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

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

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

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

An obtaining module 1001 is configured to obtain a third frequency offset. The first frequency offset is determined according to first ephemeris information and a position of the terminal equipment, wherein the first ephemeris information comprises: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time.

And a compensation module 1002, 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 the third frequency offset.

Further, an obtaining module 1001 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 first frequency offset.

And a compensation module 1002, configured to perform downlink frequency offset compensation according to the first frequency offset and the fourth frequency offset.

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

The auxiliary 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 comprises: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time.

Optionally, frequency offset compensation apparatus 1000 may further include a memory module (not shown in fig. 10) having stored thereon programs or instructions. When the processing module executes the program or instructions, the frequency offset compensation apparatus 1000 is enabled to perform the frequency offset compensation method shown in fig. 5.

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

Fig. 11 is a schematic structural diagram of a frequency offset compensation device according to an 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 ease of illustration, fig. 11 shows only the main components of the frequency offset compensation arrangement 1100.

In some embodiments, frequency offset compensation apparatus 1100 may be adapted for use in the communication system shown in fig. 2 to perform the functions of a network device in the frequency offset compensation method 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 ephemeris information comprises: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time. The geographic information is used to indicate the location of the coverage area of the network device.

A transceiver module 1102, configured to send the synchronization signal and the broadcast channel block SSB according to the fifth frequency offset.

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

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

Alternatively, 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 device 1100.

Optionally, frequency offset compensation apparatus 1100 may further include a memory module (not shown in fig. 11) that stores programs or instructions. When the processing module 1101 executes the program or instructions, the frequency offset compensation apparatus 1100 is enabled to perform the frequency offset compensation method shown in fig. 6.

It should be appreciated that the processing module 1101 involved in the frequency offset compensation apparatus 1100 may be implemented by a processor or processor-related circuit components, which may be a processor or processing unit; the transceiver module 1102 may be implemented by a transceiver or transceiver-related circuit component, which 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 components or assemblies that may be disposed in the network device, or an apparatus including the network device, which is not limited in this application.

In addition, the technical effects of the frequency offset compensation apparatus 1100 may refer to the technical effects of the frequency offset compensation method shown in fig. 6, which are not described herein again.

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

A processing module 1101, configured to obtain a time advance. Wherein the time advance is related to a coverage area of the network device. A transceiver module 1102, configured to send the time advance. Wherein the time advance is used for a terminal device within a coverage area of the network device to send a signal to the network device.

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

Optionally, frequency offset compensation apparatus 1100 may further include a memory module (not shown in fig. 11) that stores programs or instructions. When the processing module 1101 executes the program or instructions, the frequency offset compensation apparatus 1100 is enabled 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 effects of the frequency offset compensation apparatus 1100 may refer to the technical effects of the frequency offset compensation method shown in any one of fig. 8, and will not be described herein.

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

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

In one possible configuration, the processing module 1101 is configured to obtain the time 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 1102 is configured to receive the signal from the terminal device with a delay time advance.

Optionally, frequency offset compensation apparatus 1100 may further include a memory module (not shown in fig. 11) that stores programs or instructions. When the processing module 1101 executes the program or instructions, the frequency offset compensation apparatus 1100 may be caused 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 components or assemblies disposed in the network device, or an apparatus including the network device, which is not limited in the embodiments of the present application.

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

Fig. 12 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application. As shown in fig. 12, the frequency offset compensation apparatus 1200 may include an indoor baseband processing unit (building baseband unit, BBU) 1201 and an active antenna unit (active antenna unit, AAU) 1202. The BBU1201 can be used to perform the functions of data computation and processing. AAU1202 may be configured to implement the transmit and receive functions of the frequency offset compensation arrangement.

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 components or assemblies disposed in the network device, or an apparatus including the network device, which is not limited in the embodiments of the present application.

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

Fig. 13 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application. As shown in fig. 13, the frequency offset compensation apparatus 1300 includes: a receiving module 1301 and a transmitting module 1302. For ease of illustration, fig. 13 shows only the major components of the frequency offset compensation apparatus 1300.

The frequency offset compensation apparatus 1300 may be adapted to perform the functions of a terminal device in the frequency offset compensation method shown in fig. 8 in the communication system shown in fig. 2.

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

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

A transmitting module 1302, configured to transmit a signal to a network device according to the time 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 configured to implement a transmitting function and a receiving function of the frequency offset compensation apparatus 1300.

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

Optionally, the frequency offset compensation apparatus 1300 may further include a storage module (not shown in fig. 13) storing a program or instructions. When the receiving module 1301 executes the program or the instruction, the frequency offset compensation apparatus 1300 may be caused to perform the function of the terminal device in the frequency offset compensation method shown in any one of fig. 8.

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

The frequency offset compensation apparatus 1300 may be a terminal device, a chip (system) or other components or assemblies 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 effects of the frequency offset compensation apparatus 1300 may refer to the technical effects of the frequency offset compensation method shown in any one of fig. 8, and will not be described herein.

Fig. 14 is a schematic structural diagram of a frequency offset compensation apparatus according to an 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 parts or components 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 also include a memory 1402 and/or a transceiver 1403. Wherein the processor 1401 is coupled to a memory 1402 and a transceiver 1403, such as may be connected by a communication bus.

The following describes each component 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 one processor or a generic name of a plurality of processing elements. For example, processor 1401 is one or more central processing units (central processing unit, CPU), but may also be an integrated circuit (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 processor, DSPs), or one or more field programmable gate arrays (field programmable gate array, FPGAs).

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

In a particular implementation, processor 1401 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 14, as an example.

In a specific implementation, as an embodiment, the frequency offset compensation apparatus 1400 may also include 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 (single-CPU) or a multi-core processor (multi-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 present application, and the processor 1401 is configured to control the execution of the software program, and the specific implementation may refer to the above method embodiment, which is not described herein again.

Alternatively, memory 1402 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk 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. Memory 1402 may be integrated with processor 1401 or may reside separately and be coupled to processor 1401 by an interface circuit (not shown in fig. 14) of frequency offset compensation arrangement 1400, as embodiments of the present application are not specifically limited.

A transceiver 1403 for communication with other frequency offset compensation means. For example, frequency offset compensation apparatus 1400 is a terminal device and transceiver 1403 may be used to communicate with a network device or another terminal device. As another example, frequency offset compensation apparatus 1400 is a network device and transceiver 1403 may be used to communicate with a terminal device or another network device.

Alternatively, transceiver 1403 may include a receiver and a transmitter (not separately shown in fig. 14). The receiver is used for realizing the receiving function, and the transmitter is used for realizing the transmitting function.

Alternatively, transceiver 1403 may be integrated with processor 1401, or may exist separately, and be coupled to processor 1401 via an interface circuit (not shown in fig. 14) of frequency offset compensation arrangement 1400, as embodiments of the present application are not specifically limited.

It should be noted that the configuration of the frequency offset compensation apparatus 1400 shown in fig. 14 is not limited to the frequency offset compensation apparatus, and an actual frequency offset compensation apparatus may include more or less components than those shown, or may combine some components, or may be different in arrangement of components.

In addition, the technical effects of the frequency offset compensation apparatus 1400 may refer to the technical effects of the frequency offset compensation method described in the above method embodiments, and will not be described herein.

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

It should be appreciated that the processor in embodiments of the present application may be a central processing unit (central processing unit, CPU), which may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile 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. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example but not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware (e.g., circuitry), firmware, or any other combination. 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. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with the embodiments of the present application are all or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in 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 site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may 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 sets 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" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. In addition, the character "/" herein generally indicates that the associated object is an "or" relationship, but may also indicate an "and/or" relationship, and may be understood by referring to the context.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). 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 plural.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on 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 solution. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in 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 may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely 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 think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to 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 method for compensating frequency offset, applied to a terminal device, the method comprising:

acquiring a third frequency offset; the third frequency offset is a frequency offset between the terminal equipment and the network equipment, and is determined according to first ephemeris information and a position of the terminal equipment, wherein the first ephemeris information comprises one or more of the following: semi-long axis, eccentricity, orbital inclination, ascending intersection point, right ascent, near-place amplitude angle, flat-near point angle and reference time of the satellite;

and carrying out downlink frequency offset compensation according to the third frequency offset.

2. The method of compensating for frequency offset of claim 1, 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.

3. The method of frequency offset compensation according to claim 2, wherein the method further comprises:

and decoding the synchronous signal and the broadcast channel block SSB according to the third frequency offset.

4. The method of frequency offset compensation according to claim 3, wherein said method further comprises:

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

and carrying out downlink frequency offset compensation according to the third frequency offset and the fourth frequency offset.

5. The method of frequency offset compensation according to any one of claims 1-4, wherein the method further comprises:

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

updating the first ephemeris information according to the second ephemeris information; the second ephemeris information may comprise one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time.

6. A method of frequency offset compensation, applied to a network device, the method comprising:

Obtaining a fifth frequency offset according to the third ephemeris information and the geographic information; wherein the third ephemeris information comprises one or more of: semi-long axis, eccentricity, orbital inclination, ascending intersection point, right ascent, near-place amplitude angle, flat-near point angle and reference time of the satellite; the geographic information is used for indicating the position of a coverage area of the network equipment; the fifth frequency offset is the frequency offset between the network equipment and the coverage area of the network equipment;

and transmitting a synchronous signal and a broadcast channel block SSB according to the fifth frequency offset.

7. The method of frequency offset compensation according to claim 6, wherein the method further comprises:

transmitting auxiliary system information or downlink control signaling according to the fifth frequency offset; the auxiliary system information is used for indicating the terminal equipment to carry out frequency offset compensation according to the fifth frequency offset.

8. The method of frequency offset compensation according to claim 6, wherein the method further comprises:

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

9. A frequency offset compensation apparatus, said apparatus comprising: an acquisition module and a compensation module;

the acquisition module is used for acquiring a third frequency offset; the third frequency offset is a frequency offset between the frequency offset compensation device and the network device, and is determined according to first ephemeris information and a position of the terminal device, wherein the first ephemeris information comprises one or more of the following: semi-long axis, eccentricity, orbital inclination, ascending intersection point, right ascent, near-place amplitude angle, flat-near point angle and reference time of the satellite;

And the compensation module is used for carrying out downlink frequency offset compensation according to the third frequency offset.

10. The apparatus for compensating for frequency offset as defined in claim 9, wherein,

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

11. The apparatus for compensating for frequency offset as defined in claim 10, wherein,

the compensation module is further configured to decode the synchronization signal and the broadcast channel block SSB according to the third frequency offset.

12. The apparatus for compensating for frequency offset as defined in claim 11, wherein,

the acquisition module is used for 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;

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

13. The apparatus according to any one of claims 9-12, wherein,

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

the acquisition module is further used for updating the first ephemeris information according to the second ephemeris information; the second ephemeris information may comprise one or more of: the semi-long axis, the eccentricity, the orbit inclination, the ascent and descent point, the perigee amplitude angle, the plains and the short and flat point angle of the satellite and the reference time.

14. A frequency offset compensation apparatus, said apparatus comprising: a processing module and a receiving-transmitting 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 ephemeris information comprises one or more of: semi-long axis, eccentricity, orbital inclination, ascending intersection point, right ascent, near-place amplitude angle, flat-near point angle and reference time of the satellite; the geographic information is used for indicating the position of a coverage area of the network equipment; the fifth frequency offset is the frequency offset between the frequency offset compensation device and the coverage area of the frequency offset compensation device;

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

15. The apparatus for compensating for frequency offset as defined in claim 14, wherein,

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

16. The apparatus for compensating for frequency offset as defined in claim 14, wherein,

the transceiver module is further configured to send signals except SSB in the downlink signals according to the fifth frequency offset.

17. A frequency offset compensation apparatus, comprising: a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the frequency offset compensation method of any of claims 1-8 when the computer program is executed.

18. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program, which, when executed by a processor, implements the method according to any of claims 1-8.