Frequency offset estimation method, apparatus, and device, communication system, medium, and product

Abstract

The present application relates to the technical field of wireless communications, and discloses a frequency offset estimation method, apparatus, and device, a communication system, a medium, and a product. The disclosed frequency offset estimation method comprises: upon reception of current uplink service data of a terminal station, acquiring prior frequency offset estimation information of the terminal station; and on the basis of the current uplink service data and in combination with the prior frequency offset estimation information, determining a current frequency offset estimation value of the current uplink service data. Compared with the implementation of CFO estimation on each uplink slot based on a plurality of reference signals, in the present application, a base station side only needs to demodulate one reference signal for one terminal station, so that the base station can process more terminal nodes in the case of the same hardware and time-frequency resources, thereby improving the resource utilization rate of the base station.

Description

Frequency offset estimation method, device, apparatus, communication system, medium and product

[0001] Related applications

[0002] The present application claims priority to Chinese Patent Application No. 202411265071.4, filed on September 10, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of wireless communication, and in particular to a frequency offset estimation method, device, apparatus, communication system, medium and product. BACKGROUND

[0004] In a wireless communication system, the inconsistency of local oscillators at the transmitting and receiving ends and the Doppler effect in a mobile scenario can cause frequency offset. If the impact of the frequency offset cannot be eliminated or reduced, when the frequency offset is large, the demodulation performance of the system will be seriously affected.

[0005] Related wireless communication technologies usually insert reference signals at intervals between OFDM (Orthogonal Frequency Division Multiplexing) symbols for frequency offset estimation. However, if the base station estimates and compensates the CFO (carrier frequency offset) through multiple reference signals for each OFDM symbol, the complexity of demodulation of the base station will be increased, which causes the number of terminal nodes that the base station can handle to decrease under the condition of the same hardware and time-frequency resources, resulting in a low resource utilization rate of the base station. SUMMARY

[0006] The main purpose of the present application is to provide a frequency offset estimation method, device, apparatus, communication system, medium and product, which aims to solve the technical problem of low resource utilization rate of the base station.

[0007] To achieve the above-mentioned purpose, the present application provides a frequency offset estimation method, which comprises the following steps:

[0008] In the case of receiving current uplink service data of a terminal station, obtaining prior frequency offset estimation information of the terminal station;

[0009] Based on the current uplink service data, the prior frequency offset estimation information is combined to determine a current frequency offset estimation value of the current uplink service data.

[0010] In an embodiment, the step of determining the current frequency offset estimation value of the current uplink service data based on the current uplink service data and in combination with the prior frequency offset estimation information comprises:

[0011] In a case that the current uplink service data is real-time uplink service data, a current frequency offset estimation value of the current uplink service data is determined based on the current uplink service data and in combination with the prior frequency offset estimation information, and the real-time uplink service data is periodic uplink service data.

[0012] In an embodiment, in a case that the current uplink service data is real-time uplink service data, the step of determining a current frequency offset estimation value of the current uplink service data based on the current uplink service data and in combination with the prior frequency offset estimation information includes:

[0013] In a case that the current uplink service data is real-time uplink service data, a current channel estimation result is obtained by performing channel estimation on a current reference signal corresponding to the current uplink service data.

[0014] The current frequency offset estimation value of the current uplink service data is determined based on the current channel estimation result and the prior frequency offset estimation information.

[0015] In an embodiment,

[0016] The prior frequency offset estimation information includes a historical channel estimation result.

[0017] The step of determining the current frequency offset estimation value of the current uplink service data based on the current channel estimation result and the prior frequency offset estimation information includes:

[0018] The current frequency offset estimation value of the current uplink service data is determined based on the current channel estimation result and the historical channel estimation result.

[0019] In an embodiment, the current channel estimation result is a current channel estimation matrix, and / or the historical channel estimation result is a historical channel estimation matrix.

[0020] The step of determining the current frequency offset estimation value of the current uplink service data based on the current channel estimation result and the historical channel estimation result includes:

[0021] Based on the current channel estimation matrix and the historical channel estimation matrix, a superimposed channel response matrix of subcarriers overlapping in transmission resources between the current reference signal and the historical reference signal is calculated.

[0022] The current frequency offset estimation value of the current uplink service data is determined based on the superimposed channel response matrix.

[0023] In an embodiment, the step of determining the current frequency offset estimation value of the current uplink service data based on the superimposed channel response matrix includes:

[0024] The current frequency offset estimation value of the current uplink service data is estimated based on an angle parameter corresponding to a superimposed channel response matrix, a sampling point number of a reference signal, a cyclic prefix length of the uplink service data, and a gap symbol number between the current uplink service data and historical uplink service data.

[0025] In an embodiment, the prior frequency offset estimation information comprises a historical frequency offset estimation value of real-time uplink service data.

[0026] Based on the current uplink service data, the current frequency offset estimation value of the current uplink service data is determined in combination with the prior frequency offset estimation information, and the step comprises:

[0027] In a case where the current uplink service data is non-real-time uplink service data, the historical frequency offset estimation value is taken as the current frequency offset estimation value of the current uplink service data.

[0028] In an embodiment, the following at least one is included:

[0029] The frequency domain resource of the current uplink service data at least partially overlaps with a frequency domain resource of historical uplink service data corresponding to the prior frequency offset estimation information.

[0030] The reference signal in the current uplink service data and / or the reference signal in the historical uplink service data corresponding to the prior frequency offset estimation information is single.

[0031] In an embodiment, in a case where the current uplink service data of the terminal station is received, the frequency offset estimation method further comprises, before the step of obtaining the prior frequency offset estimation information of the current uplink service data:

[0032] The cycle information of real-time service of the terminal station is obtained, and the real-time service is periodic uplink service.

[0033] The real-time service is configured with resources based on the cycle information and system parameters.

[0034] In an embodiment, the step of configuring the real-time service with resources based on the cycle information and system parameters comprises:

[0035] For at least two real-time uplink service data corresponding to the real-time service, at least partially overlapping frequency domain resources are configured based on the cycle information and system parameters.

[0036] In an embodiment, the real-time uplink service data is uploaded in a data retransmission manner.

[0037] In a case where the number of terminal stations is one, the data retransmission manner of the real-time uplink service data comprises at least one of frame separation transmission, cross-frame transmission, and same-frame transmission.

[0038] In the case that the number of terminal stations is at least two, if the real-time upstream service data is new transmission upstream service data, the real-time upstream service data is transmitted through even frames; if the real-time upstream service data is retransmission upstream service data, the real-time upstream service data is transmitted through odd frames.

[0039] In an embodiment, before the step of obtaining the periodic information of the real-time service of the terminal station, the frequency offset estimation method further comprises:

[0040] Based on any one or combination of the communication period, the number of terminal stations, the reliability requirement, the scene information and the service mode, the frequency offset estimation mode is configured as the prior frequency offset estimation mode.

[0041] In addition, to achieve the above-mentioned purpose, the present application also provides a frequency offset estimation device, the frequency offset estimation device comprises:

[0042] The obtaining module is configured to, in the case that the current upstream service data of the terminal station is received, obtain the prior frequency offset estimation information of the terminal station;

[0043] The estimation module is configured to, based on the current upstream service data, determine the current frequency offset estimation value of the current upstream service data in combination with the prior frequency offset estimation information.

[0044] In addition, to achieve the above-mentioned purpose, the present application also provides a frequency offset estimation device, the device comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the frequency offset estimation method as described above.

[0045] In addition, to achieve the above-mentioned purpose, the present application also provides a communication system, the communication system comprising:

[0046] The management station is provided with the frequency offset estimation device as described above.

[0047] In addition, to achieve the above-mentioned purpose, the present application also provides a storage medium, the storage medium being a computer readable storage medium, the storage medium storing a computer program, the computer program being executed by the processor to implement the steps of the frequency offset estimation method as described above.

[0048] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, the computer program product comprising a computer program, the computer program being executed by the processor to implement the steps of the frequency offset estimation method as described above.

[0049] The one or more technical solutions provided by the present application at least have the following technical effects:

[0050] The application provides a frequency offset estimation method, device, equipment, communication system, medium and product. In the case that current uplink service data of a terminal station is received, prior frequency offset estimation information of the terminal station is acquired; and based on the current uplink service data and the prior frequency offset estimation information, a current frequency offset estimation value of the current uplink service data is determined.

[0051] Therefore, in the application, the current frequency offset estimation value of the current uplink service data is estimated by combining the current uplink service data and the prior frequency offset estimation information of the terminal station at the base station side. Since the prior frequency offset estimation information is considered, the current frequency offset estimation value of the current uplink service data can be accurately estimated by inserting only a single reference signal in the current uplink service data, compared with estimating CFO by using multiple reference signals for each uplink time slot. The base station side only needs to demodulate one reference signal for one terminal station, so that the base station can process more terminal nodes in the case of the same hardware and time-frequency resources, and the resource utilization rate of the base station is improved. BRIEF DESCRIPTION OF DRAWINGS

[0052] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, the accompanying drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0054] FIG. 1 is a performance curve of a communication system against frequency offset in different reference signal configuration cases;

[0055] FIG. 2 is a configuration table of an exemplary 5G NR PUSCH DMRS;

[0056] FIG. 3 is a schematic diagram of an exemplary 5G NR PUSCH DMRS configuration;

[0057] FIG. 4 is a schematic diagram of an exemplary WIFI long / short preamble sequence;

[0058] FIG. 5 is a flowchart of a first embodiment of the frequency offset estimation method of the application;

[0059] FIG. 6 is a schematic diagram of an exemplary frequency offset estimation of the frequency offset estimation method of the application;

[0060] FIG. 7 is a schematic diagram of exemplary scheduling information of the frequency offset estimation method of the application;

[0061] FIG. 8 is a schematic diagram of an exemplary frequency domain resource allocation of frame-by-frame transmission;

[0062] FIG. 9 is a schematic diagram of an example frequency domain resource allocation for interlaced transmission;

[0063] FIG. 10 is a schematic diagram of an example frequency domain resource allocation for crosslaced transmission;

[0064] FIG. 11 is a schematic diagram of an example frequency domain resource allocation for intra-laced transmission;

[0065] FIG. 12 is a schematic diagram of another example frequency domain resource allocation for cross-laced transmission;

[0066] FIG. 13 is a schematic diagram of a data retransmission method for at least two terminal stations;

[0067] FIG. 14 is a schematic diagram of a module structure of a frequency offset estimation device according to an embodiment of the present application;

[0068] FIG. 15 is a schematic diagram of a device structure of a hardware operating environment involved in a frequency offset estimation method according to an embodiment of the present application.

[0069] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0070] It should be understood that the specific embodiments described herein merely serve to explain the technical solutions of the present application and do not serve to limit the present application.

[0071] In the present application, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the device or system comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such device or system. Without more limitations, the elements defined by the statement "comprise" do not exclude the presence of other identical elements in the device or system comprising the element.

[0072] In order to better understand the technical solutions of the present application, the following will be described in detail in combination with the accompanying drawings and specific embodiments.

[0073] The main solution of the embodiments of the present application is: in the case of receiving current uplink service data of a terminal station, obtaining prior frequency offset estimation information of the terminal station; based on the current uplink service data, combining the prior frequency offset estimation information, determining a current frequency offset estimation value of the current uplink service data.

[0074] In a wireless communication system, the inconsistency of local oscillators at both transmitting and receiving ends and the Doppler effect in a mobile scenario can cause frequency offset. If the influence of the frequency offset cannot be eliminated or reduced, when the frequency offset is large, the demodulation performance of the system will be seriously affected.

[0075] And in the industrial communication network, wireless technology is slowly penetrating from the IT (Information Technology) layer to the OT (Operational Technology) layer, and the OT layer communication has particularly high requirements on system reliability, reaching 99.9999% or above, and if frequency offset estimation and compensation are not performed, it will greatly affect the application of wireless technology in the industrial field. In the related technology, as shown in FIG. 1, FIG. 1 is a performance curve of a communication system against frequency offset under different reference signal configurations, single symbol reference signal and two symbol reference signal are used for CFO (carrier frequency offset) estimation and compensation, it can be seen that the demodulation performance of using two symbol reference signal for CFO estimation and compensation is significantly improved compared with using single reference signal for CFO estimation and compensation, and the demodulation performance can be further improved when the interval between the reference signals changes. Therefore, inserting reference signals between OFDM symbols at a certain interval for CFO estimation and compensation can well improve the demodulation performance of the base station side.

[0076] Specifically, the frequency offset in the frequency domain is manifested as a phase rotation that changes over time in the time domain, so in the related industrial communication network, the wireless communication technology generally sends known reference signals at a certain interval within a time slot or a specific frame, and at the receiving end, the frequency offset estimation value is obtained by performing certain algorithm operations on the reference signals at different times. As shown in FIGS. 2-4, FIG. 2 is a configuration table of an exemplary 5G NR PUSCH DMRS, FIG. 3 is an exemplary 5G NR PUSCH DMRS configuration diagram, and FIG. 4 is an exemplary WIFI long and short preamble sequence diagram, it can be seen that in the 5G NR system, 1-3 additional DMRS (Demodulation Reference Signal) can be configured to cope with different degrees of channel condition frequency offset estimation, wherein the 8th-10th short preamble sequence of WIFI can be used for coarse frequency offset estimation, and the long preamble sequence can be used for fine frequency offset estimation.

[0077] It can be seen that configuring multiple known DMRSs for frequency offset estimation can accurately measure the frequency offset value for data compensation, and reduce the influence of frequency offset on the demodulation performance of the wireless system. However, it also occupies system resources, reduces the resource utilization of the base station, and affects the communication system rate or the number of terminal stations supported. For example, if a slot contains 14 symbols, the resource utilization of the base station is 92.9% when there is only one reference signal, and the resource utilization of the base station is 85.7% when there are two reference signals, which decreases by 7.2%. However, if multiple reference signals are used for CFO estimation and compensation at the base station side for each uplink slot of the terminal station, the complexity of demodulation at the base station side will increase, which will reduce the number of terminal nodes that can be processed by the base station under the same hardware and time-frequency resources.

[0078] Therefore, the present application provides a solution. The current frequency offset estimation value of the current uplink service data is estimated by combining the current uplink service data and the prior frequency offset estimation information of the terminal station at the base station side. Since the prior frequency offset estimation information is considered, the current frequency offset estimation value of the current uplink service data can be accurately estimated by inserting only a single reference signal in the current uplink service data. Compared with CFO estimation by multiple reference signals for each uplink slot, the base station only needs to demodulate one reference signal for one terminal station, so that the base station can process more terminal nodes under the same hardware and time-frequency resources, and the resource utilization of the base station is improved.

[0079] It should be noted that the execution subject of the present embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, a frequency offset estimation device, etc. capable of realizing the above functions. The present embodiment and the following embodiments will be described below with reference to a frequency offset estimation device.

[0080] Based on this, the present application provides a frequency offset estimation method. Referring to FIGS. 5 and 6, FIG. 5 is a flowchart of a first embodiment of the frequency offset estimation method of the present application, and FIG. 6 is a schematic diagram of an exemplary frequency offset estimation of the frequency offset estimation method of the present application.

[0081] In the present embodiment, as shown in FIG. 5, the frequency offset estimation method includes steps S100-S200:

[0082] Step S100, in the case of receiving the current uplink service data of the terminal station, obtaining the prior frequency offset estimation information of the terminal station.

[0083] Step S200, based on the current uplink service data, combining the prior frequency offset estimation information to determine the current frequency offset estimation value of the current uplink service data.

[0084] It should be noted that the frequency offset estimation device can be arranged at the MS (Management Station) side, i.e., the base station side, of a communication system, and performs frequency offset estimation and frequency offset compensation on uplink service data uploaded by at least one TS (Terminal Station) in the communication system. The current uplink service data is uplink service data received at a current time, and the prior frequency offset estimation information can include a prior frequency offset estimation value and / or a prior channel estimation result.

[0085] It can be understood that the frequency offset estimation device can combine the current uplink service data and the prior frequency offset estimation information to perform frequency offset estimation, obtain current frequency offset estimation information, and update the prior frequency offset estimation information based on the current frequency offset estimation information.

[0086] In addition, it can be understood that the specific implementation of determining the current frequency offset estimation value is as follows.

[0087] In a feasible implementation, step S200 can include step A210.

[0088] Step A210, in the case that the current uplink service data is real-time uplink service data, determining a current frequency offset estimation value of the current uplink service data based on the current uplink service data and in combination with the prior frequency offset estimation information.

[0089] The real-time uplink service data is periodically uploaded uplink service data.

[0090] It should be noted that, taking an industrial communication system as an example, since in the field of industrial control, communication period, number of TSs served by the MS, reliability requirement, physical planning of the production line, and service model of the production line are deterministic, when control data in the field of industrial control is carried by a wireless industrial communication network, the control data is usually regarded as periodic uplink service data by the frequency offset estimation device, i.e., most of the control data of the OT layer in the industrial communication system is periodically uploaded uplink service data, which is periodically sent to the management station side and a response is returned from the management station side, for example, the control data can include position instructions for controlling motor movement and position information fed back after action execution.

[0091] It can be understood that the uplink service data of the same terminal station in the industrial communication system can include real-time uplink service data of real-time service and / or non-real-time uplink service data of non-real-time service; wherein the real-time service has periodicity, and therefore the real-time uplink service data is periodically uploaded uplink service data. Thus, in this embodiment, for the real-time service, a current frequency offset estimation value of the current uplink service data is estimated based on the current uplink service data and in combination with the prior frequency offset estimation information.

[0092] In an implementation, step A210 can include steps A211-A212.

[0093] Step A211, in the case that the current upstream service data is real-time upstream service data, performing channel estimation based on a current reference signal corresponding to the current upstream service data to obtain a current channel estimation result.

[0094] Step A212, determining a current frequency offset estimation value of the current upstream service data based on the current channel estimation result and prior frequency offset estimation information.

[0095] It should be noted that the current reference signal is a reference signal in the current upstream service data. In the case that the current upstream service data is real-time upstream service data, the prior frequency offset estimation information is a prior channel estimation result. The current channel estimation result can represent a channel condition when the current upstream service data is received.

[0096] It can be understood that the current channel estimation result can be obtained by performing channel estimation based on the current reference signal. Therefore, the current frequency offset estimation value of the current upstream service data can be determined by combining the current channel estimation result and the prior channel estimation result.

[0097] In an implementation, the prior frequency offset estimation information includes a historical channel estimation result. Step A212 can include determining the current frequency offset estimation value of the current upstream service data based on the current channel estimation result and the historical channel estimation result.

[0098] It should be noted that the prior channel estimation result is a historical channel estimation result of the terminal station at a historical time point before the current time point. The historical channel estimation result can be obtained by performing channel estimation based on a historical reference signal in historical upstream service data received at the historical time point, and the historical upstream service data is upstream service data of real-time service received at the historical time point.

[0099] In an implementation, the reference signal in the current upstream service data and / or the reference signal in the historical upstream service data corresponding to the prior frequency offset estimation information is single.

[0100] It should be noted that before the industrial communication system enters the service stage, the number of reference signals in the upstream service data of at least one terminal station in the industrial communication system can be configured in the management station.

[0101] In a specific implementation, before the industrial communication system enters the service stage, the frequency offset estimation device can configure the reference signal in the uplink service data of each terminal station to be a single one. After the industrial communication system enters the service stage, when the frequency offset estimation device first receives the uplink service data of the terminal station, the frequency offset estimation device only performs channel estimation on the first received uplink service data to obtain the corresponding first channel estimation result, without performing frequency offset estimation and frequency offset compensation. The first channel estimation result is used as the prior frequency offset estimation information. Thus, when the current uplink service data is received subsequently, the frequency offset estimation and the frequency offset compensation can be performed by combining the current uplink service data and the prior frequency offset estimation information, to obtain the current frequency offset estimation value and the current channel estimation result, and the prior frequency offset estimation information is updated by using the current frequency offset estimation value and / or the current channel estimation result.

[0102] In a feasible implementation, the frequency domain resource of the current uplink service data at least partially overlaps with the frequency domain resource of the historical uplink service data corresponding to the prior frequency offset estimation information.

[0103] It should be noted that, before the industrial communication system enters the service stage, the management station can also configure the frequency domain resource of each terminal station to upload the corresponding uplink service data. For the uplink service data of the same terminal station, the frequency domain resource of the current uplink service data is configured to fully or partially overlap with the frequency domain resource of the historical uplink service data corresponding to the prior frequency offset estimation information, so as to ensure that the current frequency offset estimation value can be accurately estimated based on the historical channel estimation result and the current channel result.

[0104] In a feasible implementation, the current channel estimation result is a current channel estimation matrix, and / or the historical channel estimation result is a historical channel estimation matrix.

[0105] The step of "determining the current frequency offset estimation value of the terminal station based on the current channel estimation result and the historical channel estimation result" can include: calculating the superimposed channel response matrix of the subcarriers with overlapping transmission resources between the current reference signal and the historical reference signal based on the current channel estimation matrix and the historical channel estimation matrix. The current frequency offset estimation value of the terminal station is determined based on the superimposed channel response matrix.

[0106] It should be noted that the channel estimation result can be expressed in the form of a matrix. In the case that the frequency domain resource of the current uplink service data at least partially overlaps with the frequency domain resource of the historical uplink service data, there are usually subcarriers with overlapping transmission resources between the current reference signal in the current uplink service data and the historical reference signal in the historical uplink service data, and the channel estimation result corresponding to the subcarriers with overlapping transmission resources is the superimposed channel response between the current reference signal and the historical reference signal. Therefore, the current frequency offset estimation value of the terminal station can be estimated based on the superimposed channel response matrix of the subcarriers with overlapping transmission resources between the current reference signal and the historical reference signal. The superimposed channel response matrix can include at least one superimposed channel response corresponding to the subcarriers with overlapping transmission resources, and can be calculated based on the current channel estimation matrix and the historical channel estimation matrix.

[0107] In a possible implementation, the step of "determining the current frequency offset estimation value of the terminal station based on the superimposed channel response matrix" can include: estimating the current frequency offset estimation value based on the angle parameter corresponding to the superimposed channel response matrix, the sampling point number of the reference signal, the cyclic prefix length of the uplink service data, and the interval symbol number between the current uplink service data and the historical uplink service data.

[0108] It should be noted that the sampling point number is the sampling point number of the reference signal when performing channel estimation based on the reference signal, wherein the sampling point number when performing channel estimation based on the current reference signal is the same as the sampling point number when performing channel estimation based on the historical reference signal. The cyclic prefix length can be determined according to the frame structure of the uplink signal in the industrial communication system, and the uplink signal is the signal for the terminal station to upload the uplink service data. The interval symbol number is the total number of interval symbols in the transmission interval between the current uplink service data and the historical uplink service data; the transmission interval and the interval symbol between the current uplink service data and the historical uplink service data can be pre-configured in the management station before the industrial communication system enters the service stage.

[0109] In the present embodiment, the current frequency offset estimation value can be estimated by using the following Formula One. Formula One is:

[0110] wherein, The current frequency offset estimation value is represented by d, the interval symbol number between the current uplink service data and the historical uplink service data, N represents the sampling point number of the reference signal, NCP represents the cyclic prefix length of the uplink service data, NRS represents the number of subcarriers with overlapping transmission resources between the current reference signal and the historical reference signal, n represents the nth subcarrier with overlapping transmission resources, Hold represents the historical channel estimation matrix, Hnew represents the current channel estimation matrix, * represents conjugation, and angle represents the angle parameter. As can be seen from Formula One, the angle range of the angle parameter is (-π, π), and the range of the frequency offset estimation value is

[0111] In an example, if the frame structure of the uplink signal in the industrial communication system is symmetrical 4D4U, each 1ms is one frame, one frame includes 8 slots, each slot is 125us, including 9 symbols, the subcarrier spacing is 78.125KHz, N is equal to 256, Ncp=21, it can be determined that d is equal to 72, so in the service stage, the frequency offset estimation value estimated based on the channel estimation results of the real-time uplink service data of two adjacent transmissions can be estimated by using formula one, and the range of the frequency offset estimation value is: (-501Hz~501Hz).

[0112] In a feasible implementation, the prior frequency offset estimation information includes: the historical frequency offset estimation value of the real-time uplink service data.

[0113] The step S200 can include: in the case that the current uplink service data is non-real-time uplink service data, taking the historical frequency offset estimation value as the current frequency offset estimation value of the current uplink service data.

[0114] It should be noted that for the non-real-time uplink service data of the non-real-time service of the terminal station, based on the determinacy of the terminal station in the industrial communication system, the historical frequency offset estimation value of the terminal station receiving the real-time uplink service data at the historical time before the current time can be taken as the current frequency offset estimation value of the current uplink service data, and the frequency offset compensation is performed on the non-real-time uplink service data.

[0115] In an example, as shown in FIG. 6, after the industrial communication system enters the service stage, for the real-time uplink service data of the terminal station TSO, the current frequency offset estimation value FOnew corresponding to the Nth frame current uplink service data and the N+1th frame current uplink service data can be obtained by calculating the current channel estimation matrix Hnew in combination with the historical channel estimation matrix HOld. And the Nth frame current uplink service data and the N+1th frame current uplink service data can be frequency offset compensated by using the current frequency offset estimation value FOnew corresponding to each of them. Wherein, the current channel estimation matrix Hnew and the current frequency offset estimation value FOnew are calculated, and the historical channel estimation matrix HOld and the historical frequency offset estimation value FOOld in the prior frequency offset estimation information are updated by using the current channel estimation matrix Hnew and the current frequency offset estimation value FOnew. In addition, for the non-real-time uplink service data of the terminal station TSO, the historical frequency offset estimation value FOOld corresponding to the real-time uplink service data of the terminal station TSO is directly taken as the current frequency offset estimation value of the non-real-time uplink service data, and the frequency offset compensation is performed on the non-real-time uplink service data. In FIG. 6, the real-time service new transmission corresponds to the new transmission uplink service data, the real-time service retransmission corresponds to the retransmission uplink service data, and the non-real-time service corresponds to the non-real-time uplink service data.

[0116] Thus, the embodiment provides a frequency offset estimation method. The management station estimates the current frequency offset estimation value of the current uplink service data by combining the current uplink service data and the prior frequency offset estimation information. Since the prior frequency offset estimation information is considered, the current frequency offset estimation value of the current uplink service data can be accurately estimated by inserting only a single reference signal in the current uplink service data. Compared with estimating CFO by using multiple reference signals for each uplink time slot, the management station only needs to demodulate one reference signal for one terminal station, so that the management station can process more terminal nodes in the case of the same hardware and time-frequency resources, and the resource utilization of the management station is improved.

[0117] Based on the first embodiment, in the second embodiment, the same or similar contents as the above-mentioned first embodiment can be referred to the above description, and will not be described in detail. Referring to FIGS. 7-13, FIG. 7 is a schematic diagram of an exemplary scheduling information of the frequency offset estimation method, FIG. 8 is a schematic diagram of an exemplary frequency domain resource allocation of frame transmission, FIG. 9 is a schematic diagram of another exemplary frequency domain resource allocation of frame transmission, FIG. 10 is a schematic diagram of an exemplary frequency domain resource allocation of cross-frame transmission, FIG. 11 is a schematic diagram of an exemplary frequency domain resource allocation of same-frame transmission, FIG. 12 is a schematic diagram of another exemplary frequency domain resource allocation of cross-frame transmission, and FIG. 13 is a schematic diagram of a data retransmission mode of at least two terminal stations.

[0118] On this basis, before the step S100, the frequency offset estimation method can further include steps S300-S400.

[0119] In step S300, the cycle information of the real-time service of the terminal station is obtained.

[0120] The real-time service is a periodic uplink service.

[0121] In step S400, the real-time service is configured with resources based on the cycle information and system parameters.

[0122] It should be noted that the real-time uplink service data in the industrial communication system corresponds to the real-time service, and the non-real-time uplink service data corresponds to the non-real-time service. Before the industrial communication system enters the service stage, the management station needs to configure the real-time service of each terminal station with resources based on the cycle information of the real-time service of each terminal station, and / or configure the non-real-time service of each terminal station with resources in the management station, to obtain the scheduling information of each terminal station and send it to the corresponding terminal station, so that each terminal station can upload its own uplink service data according to the received scheduling information. The cycle information can be determined according to the communication cycle, the number of TSs served by the MS, the reliability requirement, the physical planning of the production line, and the service model of the production line, etc. The system parameters can include the frame structure of the uplink signal, the subcarrier spacing, etc.

[0123] In a possible implementation, before step S300, the frequency offset estimation method further comprises: configuring the frequency offset estimation mode as the prior frequency offset estimation mode based on any one or combination of the communication period, the number of terminal stations, the reliability requirement, the scenario information, and the service mode.

[0124] It should be noted that the scheduling information can further comprise the frequency offset estimation mode of the frequency offset estimation device, that is, the frequency offset estimation mode of each terminal station can be configured at the management station before the communication system enters the service stage. The frequency offset estimation mode can comprise a normal mode and a prior frequency offset estimation mode. In the normal mode, the frequency offset estimation device performs frequency offset estimation based on multiple reference signals, and in the prior frequency offset estimation mode, the frequency offset estimation device performs frequency offset estimation based on the frequency offset estimation method of the embodiment. As shown in FIG. 7, in the scheduling information, the frequency offset estimation mode is represented by an unsigned 8-bit integer, the normal mode is represented by 0, and the prior frequency offset estimation mode is represented by 1.

[0125] It can be understood that for different communication systems, the frequency offset estimation mode to be used can be determined according to any one or combination of the communication period, the number of terminal stations, the reliability requirement, the scenario information, and the service mode of the communication system. The communication period, the reliability requirement, the scenario information, and the service mode can be determined according to actual industrial control scenarios. The number of terminal stations is the total number of terminal stations served by the management station in the communication system. The scenario information can comprise the physical planning of the production line, and the service mode can comprise the service model of the production line.

[0126] In an example, in the case that the terminal station does not move or the accuracy of the crystal oscillator is high, the normal mode can be used, and conversely, in the case that the terminal station moves or the accuracy of the crystal oscillator is low, the prior frequency offset estimation mode can be used.

[0127] In addition, it can be understood that in order to accurately issue the scheduling information of each terminal station, the scheduling information can further comprise the identity of the terminal station TS ID. As shown in FIG. 7, in the scheduling information, the TS ID can be represented by an unsigned 8-bit integer.

[0128] In a possible implementation, step S400 can comprise step A410:

[0129] In step A410, for at least two real-time uplink service data corresponding to real-time services, at least partially overlapped frequency domain resources are configured based on the period information and the system parameters.

[0130] It should be noted that for the same terminal station, the frequency domain resources of each real-time uplink service data uploaded at different times need to be fully overlapped or partially overlapped, therefore, the scheduling information can further include the frequency domain overlap positions of at least two real-time uplink service data of each terminal station. As shown in FIG. 7, when the total number of RBs (Resource Block) of the frequency domain resource is 20, the frequency domain overlap positions in the scheduling information are represented in the form of bitmap (bit map) by using unsigned 32-bit integer.

[0131] In an available embodiment, the real-time uplink service data is uploaded in the manner of data retransmission.

[0132] When the number of terminal stations is one, the data retransmission manner of the real-time uplink service data includes at least one of frame separation transmission, cross-frame transmission and same-frame transmission.

[0133] When the number of terminal stations is at least two, for the real-time uplink service data being new transmission uplink service data, the transmission is through even frames, and for the real-time uplink service data being retransmission uplink service data, the transmission is through odd frames.

[0134] It should be noted that the scheduling information can further include the transmission interval between twice adjacent transmission of real-time uplink service data, which can be determined according to the data retransmission manner of the real-time uplink service data and the frame structure of the uplink signal. Among them, in the case that the industrial communication system includes different numbers of terminal stations, the data retransmission manner of the real-time uplink service data is different.

[0135] In the present embodiment, when there is only one terminal station in the industrial communication system, the data retransmission manner of the terminal station can include at least one of frame separation transmission, cross-frame transmission and same-frame transmission, preferably, the data retransmission manner of the same terminal station is any one of frame separation transmission, cross-frame transmission and same-frame transmission. When there are two or more terminal stations in the industrial communication system, the new transmission uplink service data of each terminal station is transmitted through even frames, and the retransmission uplink service data of each terminal station is transmitted through odd frames. And for the non-real-time uplink service data of the terminal station, the idle frequency domain resource of the frame corresponding to the non-real-time uplink service data is used for transmission. As shown in FIG. 7, in the scheduling information, the transmission interval can be represented by using unsigned 8-bit integer.

[0136] In an example, assuming that the frame structure of the uplink signal of the communication system is symmetrical 4D4U, each 1ms is 1 frame, including 8 slots, each slot 125us, including 9 symbols. As shown in Fig. 8, in the case of one terminal station, when the data retransmission is one time, the newly transmitted uplink service data is in frame N, the retransmitted uplink service data is in frame N+1, the frequency domain resource positions of the two transmissions of the real-time uplink service data are consistent. As shown in Fig. 9, in the case of one terminal station, when the data retransmission is three times, the newly transmitted uplink service data is in frame N, the retransmitted uplink service data is in frame N+1, the frequency domain resource positions of the two transmissions of the real-time uplink service data are consistent, the newly transmitted uplink service data is in frame N, the retransmitted uplink service data is in frame N+1, frame N+2 and frame N+3, the frequency domain resource positions of the four transmissions of the uplink service data are consistent. As shown in Fig. 10, in the case of one terminal station, when the data retransmission is one time, the newly transmitted uplink service data is in frame N, the retransmitted uplink service data is in frame N+2, the frequency domain resource positions of the two transmissions of the real-time uplink service data are consistent. As shown in Fig. 11, in the case of one terminal station, when the data retransmission is one time, the newly transmitted uplink service data is in U0, the retransmitted uplink service data is in U2, the frequency domain resource positions of the two transmissions of the real-time uplink service data are consistent. As shown in Fig. 12, in the case of one terminal station, when the data retransmission is one time, the newly transmitted uplink service data is in frame N, the retransmitted uplink service data is in frame N+1, the frequency domain resource positions of the two transmissions of the real-time uplink service data are inconsistent, but partially overlap.

[0137] In another example, assuming that the frame structure of the uplink signal of the communication system is symmetrical 4D4U, each 1ms is 1 frame, including 8 slots, each slot 125us, including 9 symbols. As shown in Fig. 13, if the MS serves 14 TSs of real-time services, numbered TS0-TS13, the service period is 2ms, the newly transmitted uplink service data of each terminal station is transmitted in even frames, and the retransmitted uplink service data is transmitted in odd frames.

[0138] In addition, it can be understood that the non-real-time uplink service data of the non-real-time services of each terminal station can be transmitted in the idle frequency domain resource. As shown in Fig. 13, in the 2N+1 frame, the non-real-time uplink service data of TS0 is transmitted in the idle frequency domain resource of U3.

[0139] Therefore, the embodiment provides a frequency offset estimation method. Before the communication system enters the service stage, the scheduling information of each terminal station in the communication system is configured according to the system characteristics of the communication system, so that in the subsequent service stage, the real-time frequency offset estimation device can perform real-time frequency offset estimation based on the prior frequency offset estimation information, and the resource utilization rate of the management station is improved.

[0140] The application provides a frequency offset estimation device, as shown in FIG. 14, which can include:

[0141] The acquisition module 10 is configured to acquire prior frequency offset estimation information of the terminal station in the case that the current upstream service data of the terminal station is received.

[0142] The estimation module 20 is configured to determine a current frequency offset estimation value of the current upstream service data based on the current upstream service data and in combination with the prior frequency offset estimation information.

[0143] More implementation details of the specific implementation of the frequency offset estimation device described above can be found in the description of the specific implementation of the frequency offset estimation method in the above-mentioned embodiments, and will not be repeated here for the sake of brevity of the description.

[0144] The application provides a frequency offset estimation device, which includes at least one processor and a memory connected in communication with the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the frequency offset estimation method in Embodiment I.

[0145] Reference is made to FIG. 15, which shows a structural schematic diagram of a frequency offset estimation device suitable for implementing the embodiments of the application. The frequency offset estimation device in the embodiments of the application can include, but is not limited to, mobile terminals such as notebook computers, PDAs (Personal Digital Assistant), PADs (Portable Application Description), and the like, and fixed terminals such as desktop computers and the like. The frequency offset estimation device shown in FIG. 15 is only an example, and should not bring any limitation to the functions and use range of the embodiments of the application.

[0146] As shown in FIG. 15, the frequency offset estimation device can include a processing apparatus 1001 (for example, a central processing unit, a graphics processing unit, etc.) that can perform various appropriate actions and processes according to a program stored in a read only memory (ROM) 1002 or a program loaded from a storage apparatus 1003 into a random access memory (RAM) 1004. In the RAM 1004, various programs and data required for operation of the frequency offset estimation device are also stored. The processing apparatus 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input apparatus 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, etc.; an output apparatus 1008 including, for example, a liquid crystal display (LCD), a speaker, etc.; the storage apparatus 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication apparatus 1009. The communication apparatus 1009 can allow the frequency offset estimation device to perform wireless or wired communication with other devices to exchange data. Although the frequency offset estimation device having various systems is shown in the figure, it should be understood that all the shown systems are not required to be implemented or possessed. More or less systems can be alternatively implemented or possessed.

[0147] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing program codes for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network through the communication apparatus, or installed from the storage apparatus 1003, or installed from the ROM 1002. When the computer program is executed by the processing apparatus 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are performed.

[0148] The frequency offset estimation device provided in the present application adopts the frequency offset estimation method in the above-mentioned embodiments, and can solve the technical problem of low resource utilization rate of the base station. Compared with the related art, the frequency offset estimation device provided in the present application has the same beneficial effects as the frequency offset estimation method provided in the above-mentioned embodiments, and other technical features in the frequency offset estimation device are the same as the features disclosed in the above-mentioned embodiments, which will not be described here.

[0149] It should be understood that portions of the application disclosed can be implemented in hardware, software, firmware, or combinations thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0150] The above description is merely illustrative of the application and not restrictive.

[0151] The application provides a communication system, which can comprise:

[0152] A management station, which is provided with the frequency offset estimation device as above.

[0153] More implementation details of the above frequency offset estimation device can be found in the description of the specific implementation of the frequency offset estimation device in the above embodiments, which will not be repeated here for the sake of brevity of the description.

[0154] The application provides a computer readable storage medium having computer readable program instructions (i.e. computer programs) stored thereon, which are used to execute the frequency offset estimation method in the above embodiments.

[0155] The computer readable storage medium provided by the application may, for example, be a U disk, but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system or device, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more conductive wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present embodiment, the computer readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer readable storage medium can be transmitted by any suitable medium, including but not limited to electrical wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0156] The computer readable storage medium can be included in the frequency offset estimation device, or can exist separately from the frequency offset estimation device.

[0157] The computer readable storage medium carries one or more programs, which when executed by the frequency offset estimation device, cause the frequency offset estimation device to: acquire prior frequency offset estimation information of the terminal station in a case where current upstream service data of the terminal station is received; and determine a current frequency offset estimation value of the current upstream service data based on the current upstream service data and in combination with the prior frequency offset estimation information.

[0158] Computer program code for carrying out operations of the present application can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider).

[0159] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0160] The modules described in the embodiments of the present application can be implemented in the form of software or in the form of hardware. In some cases, the names of the modules do not constitute a limitation on the modules themselves.

[0161] The readable storage medium provided in the present application is a computer readable storage medium, which stores computer readable program instructions (i.e., a computer program) for executing the above frequency offset estimation method, and can solve the technical problem of low resource utilization rate of a base station. Compared with the related art, the computer readable storage medium provided in the present application has the same beneficial effects as the frequency offset estimation method provided in the above embodiments, and will not be described here.

[0162] The present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the frequency offset estimation method as described above.

[0163] The computer program product provided in the present application can solve the technical problem of low resource utilization rate of a base station. Compared with the related art, the computer program product provided in the present application has the same beneficial effects as the frequency offset estimation method provided in the above embodiments, and will not be described here.

[0164] The above only describes some embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the technical concept of the present application, and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A frequency offset estimation method, wherein, The frequency offset estimation method comprises: In the case of receiving current upstream service data of a terminal station, obtaining prior frequency offset estimation information of the terminal station; Based on the current upstream service data, the prior frequency offset estimation information is combined to determine the current frequency offset estimation value of the current upstream service data.

2. The frequency offset estimation method of claim 1, wherein, The step of determining the current frequency offset estimation value of the current upstream service data based on the current upstream service data and the prior frequency offset estimation information comprises: In the case of the current upstream service data being real-time upstream service data, the current upstream service data is combined with the prior frequency offset estimation information to determine the current frequency offset estimation value of the current upstream service data.

3. The frequency offset estimation method of claim 2, wherein, The step of determining the current frequency offset estimation value of the current upstream service data based on the current upstream service data and the prior frequency offset estimation information comprises: In the case of the current upstream service data being real-time upstream service data, the current upstream service data is combined with the prior frequency offset estimation information to determine the current frequency offset estimation value of the current upstream service data.

4. The frequency offset estimation method of claim 3, wherein The prior frequency offset estimation information comprises historical channel estimation results; The step of determining the current frequency offset estimation value of the current upstream service data based on the current channel estimation results and the prior frequency offset estimation information comprises: Based on the current channel estimation results and the historical channel estimation results, the current frequency offset estimation value of the current upstream service data is determined. The current channel estimation results are current channel estimation matrices, and / or the historical channel estimation results are historical channel estimation matrices; 5. The frequency offset estimation method of claim 4, wherein, The step of determining the current frequency offset estimation value of the current upstream service data based on the current channel estimation results and the historical channel estimation results comprises: Based on the current channel estimation matrices and the historical channel estimation matrices, a superimposed channel response matrix of subcarriers overlapping in transmission resources between the current reference signal and historical reference signals is calculated; Based on the superimposed channel response matrix, the current frequency offset estimation value of the current upstream service data is determined. The step of determining the current frequency offset estimation value of the current upstream service data based on the superimposed channel response matrix comprises:

6. The frequency offset estimation method of claim 5, wherein, Based on the angle parameters corresponding to the superimposed channel response matrix, the sampling point number of the reference signal, the cyclic prefix length of the upstream service data, and the interval symbol number between the current upstream service data and the historical upstream service data, the current frequency offset estimation value of the current upstream service data is estimated. The prior frequency offset estimation information comprises historical frequency offset estimation values of real-time upstream service data; 7. The frequency offset estimation method of claim 1, wherein, The step of determining the current frequency offset estimation value of the current upstream service data based on the current upstream service data and the prior frequency offset estimation information comprises: ​ In a case that the current upstream service data is non-real-time upstream service data, the historical frequency offset estimation value is taken as a current frequency offset estimation value of the current upstream service data.

8. The frequency offset estimation method of any one of claims 1 to 7, wherein, The method comprises at least one of the following: The frequency domain resource of the current upstream service data at least partially overlaps with the frequency domain resource of the historical upstream service data corresponding to the prior frequency offset estimation information; The reference signal in the current upstream service data and / or the reference signal in the historical upstream service data corresponding to the prior frequency offset estimation information is single.

9. The frequency offset estimation method of any one of claims 1 to 7, wherein, Before the step of obtaining the prior frequency offset estimation information of the current upstream service data of the terminal station in a case that the current upstream service data of the terminal station is received, the frequency offset estimation method further comprises: Obtaining cycle information of real-time services of the terminal station, the real-time services being periodic upstream services; Performing resource configuration on the real-time services based on the cycle information and system parameters.

10. The frequency offset estimation method of claim 9, wherein, The step of performing resource configuration on the real-time services based on the cycle information and system parameters comprises: For at least two real-time upstream service data corresponding to the real-time services, at least partially overlapping frequency domain resources are configured based on the cycle information and system parameters.

11. The frequency offset estimation method of claim 9, wherein, The real-time upstream service data is uploaded in a data retransmission manner; In a case that the number of the terminal stations is one, the data retransmission manner of the real-time upstream service data comprises at least one of frame separation transmission, cross-frame transmission and same-frame transmission; In a case that the number of the terminal stations is at least two, if the real-time upstream service data is new transmission upstream service data, the real-time upstream service data is transmitted through even frames; if the real-time upstream service data is retransmission upstream service data, the real-time upstream service data is transmitted through odd frames.

12. The frequency offset estimation method of claim 9, wherein, Before the step of obtaining the cycle information of the real-time services of the terminal station, the frequency offset estimation method further comprises: Based on any one or combination of communication cycle, number of terminal stations, reliability requirement, scene information and service mode, a frequency offset estimation mode is configured as a prior frequency offset estimation mode.

13. A frequency offset estimation apparatus, wherein, The frequency offset estimation device comprises: An obtaining module, configured to obtain prior frequency offset estimation information of a terminal station in a case that current upstream service data of the terminal station is received; An estimation module, configured to determine a current frequency offset estimation value of the current upstream service data based on the current upstream service data and in combination with the prior frequency offset estimation information.

14. A frequency offset estimation device, the device comprising: A memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the frequency offset estimation method according to any one of claims 1 to 12.

15. A communication system, comprising: A management station provided with the frequency offset estimation device according to claim 14.

16. A storage medium, the storage medium being a computer-readable storage medium, the storage medium storing a computer program, the computer program being executable by a processor to implement the steps of the frequency offset estimation method according to any one of claims 1 to 12.

17. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the frequency offset estimation method according to any one of claims 1 to 12.

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