CN118054892A

CN118054892A - Pilot information determining method, device, electronic equipment and readable storage medium

Info

Publication number: CN118054892A
Application number: CN202211457970.5A
Authority: CN
Inventors: 高宁泊; 朱莎莎; 雷立辉
Original assignee: Zeku Technology Beijing Corp Ltd
Current assignee: Zeku Technology Beijing Corp Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2024-05-17

Abstract

The application relates to a pilot information determining method, a pilot information determining device, electronic equipment and a readable storage medium. The method comprises the following steps: according to the control information sent by the base station, obtaining candidate pilot frequency information configured by the base station; determining the number of target pilot symbols according to a reference signal sent by a base station; determining first target pilot frequency information from the candidate pilot frequency information according to the target pilot frequency symbol number; the first target pilot information is used for channel estimation. The method can reduce the computational complexity of channel estimation and reduce occupied storage resources.

Description

Pilot information determining method, device, electronic equipment and readable storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and apparatus for determining pilot information, an electronic device, and a readable storage medium.

Background

In a 5G NR communication system, the 3GPP protocol designs a demodulation reference signal (De-modulation REFERENCE SIGNAL, DMRS) for channel estimation and demodulation for a downlink shared channel (Physical downlink SHARE CHANNEL, PDSCH), and flexibly configures the number of DMRS symbols through semi-static radio resource control (Radio Resource Control, RRC) signaling and downlink control information (Downlink control information, DCI) for each slot (slot). In the conventional technology, the UE performs channel estimation according to all DMRS symbols configured by the base station.

However, the channel estimation method in the prior art has the problems of higher computational complexity and more occupied storage resources.

Disclosure of Invention

The embodiment of the application provides a pilot frequency information determining method, a device, electronic equipment and a readable storage medium, which can reduce the computational complexity of channel estimation and reduce occupied storage resources.

In a first aspect, an embodiment of the present application provides a method for determining pilot information, including:

Acquiring candidate pilot frequency information configured by a base station according to control information sent by the base station;

Determining the number of target pilot symbols according to the reference signals sent by the base station;

determining first target pilot frequency information from the candidate pilot frequency information according to the target pilot frequency symbol number; the first target pilot information is used for channel estimation.

In a second aspect, an embodiment of the present application provides a pilot information determining apparatus, including:

The acquisition module is used for acquiring candidate pilot frequency information configured by the base station according to control information sent by the base station;

A first determining module, configured to determine a target pilot symbol number according to a reference signal sent by the base station;

A second determining module, configured to determine, according to the target pilot symbol number, first target pilot information from the candidate pilot information; the first target pilot information is used for channel estimation.

In a third aspect, an embodiment of the present application provides an electronic device, including a memory and a processor, where the memory stores a computer program, where the computer program, when executed by the processor, causes the processor to perform the steps of the pilot information determining method according to the first aspect.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to the first aspect.

In a fifth aspect, embodiments of the present application provide a computer program product comprising a computer program which, when executed by a processor, implements the steps of the method according to the first aspect.

According to the pilot information determining method, the device, the electronic equipment and the readable storage medium, the candidate pilot information configured by the base station can be obtained according to the control information sent by the base station, and the target pilot symbol number can be determined according to the reference signal sent by the base station, so that the first target pilot information used for carrying out channel estimation can be determined from the candidate pilot information according to the determined target pilot symbol number, and the pilot used for carrying out channel estimation is not all the candidate pilot information but is determined from the candidate pilot information according to the determined target pilot symbol number.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of pilot patterns of different pilot symbol configurations in the conventional art;

FIG. 2 is an application environment diagram of a pilot information determination method in one embodiment;

FIG. 3 is a flow diagram of a method of pilot information determination in one embodiment;

fig. 4 is a flowchart of a pilot information determination method in another embodiment;

fig. 5 is a flowchart of a pilot information determination method in another embodiment;

fig. 6 is a flowchart of a pilot information determination method in another embodiment;

Fig. 7 is a flowchart of a pilot information determination method in another embodiment;

FIG. 8 is a diagram illustrating comparison of block error rates of different pilot symbols corresponding to a Doppler configuration of 30Hz in one embodiment;

FIG. 9 is a diagram illustrating comparison of block error rates of different pilot symbols corresponding to a Doppler configuration of 120Hz in one embodiment;

FIG. 10 is a diagram illustrating comparison of block error rates of different pilot symbols corresponding to a Doppler configuration of 240Hz in one embodiment;

FIG. 11 is a diagram illustrating comparison of block error rates of different pilot symbols corresponding to a Doppler configuration of 400Hz in one embodiment;

fig. 12 is a block diagram showing the structure of a pilot information determining apparatus in one embodiment;

fig. 13 is a block diagram showing the construction of a pilot information determining apparatus in another embodiment;

Fig. 14 is a block diagram showing the construction of a pilot information determining apparatus in another embodiment;

Fig. 15 is a block diagram showing the construction of a pilot information determining apparatus in another embodiment;

FIG. 16 is a schematic diagram of the internal structure of a computer device in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

In a 5G NR communication system, the 3GPP protocol designs a demodulation reference signal DMRS for channel estimation and demodulation for PDSCH, and can flexibly configure the number of DMRS symbols through semi-static RRC signaling and DCI (Downlink) of each slot, for example, when the moving speed of UE is low, a base station gNodeB can configure a smaller number of DMRS, for example, 1-2 DMRS symbols for UE, and when the moving speed of UE is high, gNodeB can configure 4 symbols of DMRS pilot symbols at most for UE for improving the accuracy of channel estimation, thereby improving the demodulation performance, taking NR PDSCH DMRS TYPE as an example, the horizontal axis in FIG. 1 represents one time slot (slot), the vertical axis in FIG. 1 represents a channel estimation method in RB. traditional technology, one-dimensional or two-dimensional denoising and difference operation is performed by using the obtained channel estimation result, and demodulation and DMRS can be seen by the graph d in FIG. 1, when the moving speed of UE is high, 4 columns of pilot symbols are configured for UE, in order to ensure that the capability of storing and storing all pilot symbols is reserved for UE, in the UE, and in order to solve the most cases that the capability of storing the UE can be stored in a large scale, if the capability of the UE is required to store the UE, the capability of storing the UE can be integrated, the capability of storing the pilot symbols is guaranteed, and the capability is most about the capability is required to be stored in the UE, if the capability is most is required to be stored in the UE, and the capability is large, the capability is required to store in the UE, and the capability is as per the capability is as a capability of the capability of storing the UE. The channel estimation is carried out by using fewer DMRS pilot frequency symbols as much as possible, so that the calculation complexity is reduced, and the calculation speed is improved; the maximum number of the DMRS pilot symbols used for channel estimation is limited in a multi-carrier scene, so that the maximum calculation power and the storage capacity of the UE are saved, and the size occupied by a chip in the UE is reduced.

The pilot information determining method provided by the embodiment of the application can be applied to an application environment as shown in fig. 2. Wherein the terminal 102 communicates with the base station 104. Base station 104 is a device deployed in an access network to provide wireless communication functions for terminal 102, and in a system employing different radio access technologies, the names of devices with base station functions may be different, for example, in a long term evolution (Long Term Evolution, LTE) system, referred to as an evolved Node B (eNodeB) or an eNB; in a 5G New air interface (NR) system, it is called gNodeB or gNB. The terminal 102 and the base station 104 may perform wireless communication, the terminal 102 may be a smart phone, a tablet computer, a personal computer, a notebook computer, a wearable device, a vehicle-mounted device, etc., and the base station 104 may be any type of base station device such as a macro base station, a micro base station or a pico base station.

It should be noted that, the embodiment of the present application is described based on NR PDSCH DMRS TYPE a1, and the method for determining pilot information provided by the embodiment of the present application is also applicable to NR PDSCH DMRS TYPE a, LTE systems, and other various RSs of NR. The pilot frequency information determining method provided by the embodiment of the application is not only suitable for a single carrier scene, but also suitable for a multi-carrier scene. In addition, the pilot information determining method provided by the embodiment of the application is applicable to an NR vehicle-mounted V2X (Vehicle to Everything) system, an enhanced mobile broadband communication system eMBB (Enhanced Mobile Broadband) system, a high-reliability low-delay communication system URLLC (Ultra-reliable low latency Communications) system, an enhanced machine communication system eMTC (ENHANCED MACHINE TYPE Communications) and the like.

In one embodiment, as shown in fig. 3, a pilot information determining method is provided, and the method is applied to the terminal in fig. 2 for illustration, and includes the following steps:

S201, according to control information sent by the base station, candidate pilot frequency information configured by the base station is obtained.

The control information transmitted by the base station may include radio resource control (Radio Resource Control, RRC) signaling and downlink control information (Downlink control information, DCI), among others. Optionally, in this embodiment, the control information sent by the base station may be parsed, and candidate pilot information configured by the base station in the current time slot may be obtained from the control information. Alternatively, the base station configured candidate pilot information may include a base station configured candidate pilot symbol number and/or a base station configured candidate pilot pattern. Illustratively, the candidate pilot information configured by the base station may be any of the pilot information shown in fig. 1 described above. After the terminal obtains the candidate pilot information configured by the base station, channel estimation and signal demodulation may be performed based on the obtained candidate pilot information, and further, the terminal may perform channel estimation by using the column shown in fig. 1 where the black lattice is located, and perform signal demodulation by using other columns than the column where the black lattice is located.

S202, determining the number of target pilot symbols according to the reference signals sent by the base station.

The reference signal transmitted by the base station may be various reference signals transmitted by the base station, for example, a tracking reference signal (TRACKING REFERENCE SIGNAL, TRS) transmitted by the base station, and the like. The reference signal (REFERENCE SIGNAL, RS) is a "pilot" signal, which is a known signal provided by the transmitting end to the receiving end for channel estimation or channel detection, and optionally, the reference signal sent by the base station in this embodiment may be used for correlation detection and demodulation at the UE end, downlink channel quality measurement, cell search, and so on. Optionally, in this embodiment, the UE may estimate the reference signal sent by the base station by using a doppler estimation method, etc., to obtain the target pilot symbol number, where the doppler estimation method is a criterion in a time direction, and may estimate information such as a moving speed of the UE by using the doppler estimation method, so that the target pilot symbol number may be determined based on the moving speed of the UE. The determined target number of pilot symbols may be, for example, the number of pilot symbols in one column illustrated in fig. 1, the number of pilot symbols in two columns illustrated in fig. 1, or the number of pilot symbols in three columns illustrated in fig. 1, or the number of pilot symbols in four columns illustrated in fig. 1, but it is to be noted here that the determined number of pilot symbols is at most the number of pilot symbols in 4 columns illustrated in fig. 1, but not more than 4 columns.

S203, determining first target pilot frequency information from the candidate pilot frequency information according to the target pilot frequency symbol number; the first target pilot information is used for channel estimation.

The first target pilot information is pilot information for performing channel estimation, for example, the first target pilot information may be a column in which a black lattice shown in fig. 1 is located. Optionally, the first target pilot information may include the number of pilot symbols and the position information of the pilot symbols, and further, the number of pilot symbols in the first target pilot information may be equal to or less than the number of target pilot symbols, which is not limited herein. Alternatively, in this embodiment, all pilot information used for channel estimation in the candidate pilot information may be determined as the first target pilot information according to the number of target pilot symbols, or part of pilot information used for channel estimation in the candidate pilot information may be determined as the first target pilot information according to the number of target pilot symbols. Optionally, in this embodiment, the first target pilot information may include the number of pilot symbols used for channel estimation and position information of the pilot symbols, and the UE may generate a pilot pattern for performing channel estimation according to the number of pilot symbols used for channel estimation and the position information of the pilot symbols, and further perform channel estimation using the pilot pattern.

According to the pilot information determining method, the candidate pilot information configured by the base station can be obtained according to the control information sent by the base station, and the target pilot symbol number can be determined according to the reference signal sent by the base station, so that the first target pilot information for carrying out channel estimation can be determined from the candidate pilot information according to the determined target pilot symbol number, and the pilot for carrying out channel estimation is not all the candidate pilot information but is determined from the candidate pilot information according to the determined target pilot symbol number.

In the above scenario of determining the first target pilot information from the candidate pilot information according to the number of target pilot symbols, the first target pilot information may be determined according to a comparison result between the number of target pilot symbols and a preset value, and how to determine the first target pilot information will be described in detail in this embodiment. In one embodiment, as shown in fig. 4, S203 above includes:

S301, comparing the target pilot frequency symbol number with a preset value to obtain a first comparison result.

Optionally, in this embodiment, a first comparison result of the target number of symbols and the preset value may be obtained according to a difference or a ratio of the target number of pilot symbols and the preset value. Alternatively, the preset value may be any one of 1,2, 3, and 4, but it should be noted that the preset value in this embodiment is not greater than 4. Alternatively, the number of target pilot symbols in this embodiment may be any one of 1,2, 3, 4 and 5, and this embodiment does not limit the number of target pilot symbols herein. For example, assuming that the preset value is 1 and the target pilot symbol number is 3, the obtained first comparison result is that the target pilot symbol number is greater than the preset value, and further, for example, assuming that the preset value is 1 and the target pilot symbol number is 1, the obtained first comparison result is that the target pilot symbol number is equal to the preset value.

S302, determining first target pilot frequency information from candidate pilot frequency information according to a first comparison result.

Optionally, in this embodiment, since the preset value does not exceed 4, if the number of the target pilot symbols is smaller than or equal to the preset value, the pilot information received from the beginning to the end in the candidate pilot information may be determined as the beginning to the end in the first target pilot information according to the number of the target pilot symbols, and then any one of the remaining pilot information except the beginning to the end in the candidate pilot information may be used as the remaining pilot information of the first target pilot information; if the number of the target pilot symbols is greater than a preset value, the pilot information corresponding to all pilot symbols of the candidate pilot information can be determined as the first target pilot information.

For example, in this embodiment, assuming that the preset value is 1, if the first comparison result is that the number of target pilot symbols is equal to 1, the pilot information received first in the candidate pilot information may be determined as the first target pilot information; if the first comparison result is that the number of pilot symbols is greater than 1, the first target pilot information may be determined from the candidate pilot information according to the number of pilot symbols in the candidate pilot information, for example, if the number of pilot symbols is 5 and the number of pilot symbols in the candidate pilot information is 4, pilot information corresponding to the 4 pilot symbols of the candidate pilot information may be determined as the first target pilot information.

In another example, the scheme of the present embodiment is described, assuming that the preset value is 3, if the first comparison result is that the number of the target pilot symbols is equal to 3, the pilot information received from the beginning to the end in the candidate pilot information may be determined as the first target pilot information from the first target pilot information, and then any one of the remaining pilot information except the first target pilot information in the candidate pilot information is determined as the remaining pilot information of the first target pilot information; if the first comparison result is that the number of pilot symbols is greater than 3, the first target pilot information may be determined from the candidate pilot information according to the number of pilot symbols in the candidate pilot information, for example, if the number of pilot symbols is 5 and the number of pilot symbols in the candidate pilot information is 4, pilot information corresponding to the 4 pilot symbols of the candidate pilot information may be determined as the first target pilot information.

In this embodiment, by comparing the number of target pilot symbols with the preset value, a first comparison result of the target pilot symbols and the preset value can be obtained quickly, and since the efficiency of obtaining the first comparison result is improved, the first target pilot information can be determined from the candidate pilot information quickly according to the obtained first comparison result, and the efficiency of determining the first target pilot information is improved; in addition, the first target pilot frequency information is determined from the candidate pilot frequency information, so that on the premise of ensuring the performance, less pilot frequency information is used for channel estimation as much as possible, the calculation complexity is reduced, the calculation speed is improved, occupied storage resources are reduced, the maximum computing power and storage capacity of the electronic equipment are saved, and the size of a chip in the electronic equipment is reduced.

In the scenario of determining the first target pilot information from the candidate pilot information according to the comparison result of the target pilot symbol number and the preset value, the preset value may be 2, and the candidate pilot information may include a candidate pilot pattern. In one embodiment, as shown in fig. 5, S302 includes:

S401, if the first comparison result is that the number of target pilot symbols is smaller than 2, the pilot information received first in the candidate pilot pattern is determined as the first target pilot information.

In this embodiment, if the comparison result between the number of target pilot symbols and 2 indicates that the number of target pilot symbols is smaller than 2, it is indicated that there is only one target pilot symbol, and at this time, the pilot information received first in the candidate pilot pattern included in the candidate pilot information may be determined as the first target pilot information. Taking the candidate pilot pattern as the pilot pattern d in fig. 1 as an example, if pilot information corresponding to the first column formed by the black grid in the pilot pattern d is the pilot information received first, the pilot information corresponding to the first column formed by the black grid in the pilot pattern d may be determined as the first target pilot information.

And S402, if the first comparison result is that the number of the target pilot symbols is equal to 2, determining the pilot information received first and received last in the candidate pilot pattern as first target pilot information.

In this embodiment, if the comparison result between the number of target pilot symbols and 2 indicates that the number of target pilot symbols is equal to 2, it is indicated that there are two target pilot symbols, and at this time, the pilot information received first and received last in the candidate pilot pattern included in the candidate pilot information may be determined as the first target pilot information. Continuing taking the candidate pilot pattern as the pilot pattern d in fig. 1 as an example, if the pilot information corresponding to the first column formed by the black grid in the pilot pattern d is the pilot information received first and the pilot information corresponding to the last column formed by the black grid is the pilot information received last, the pilot information corresponding to the first column formed by the black grid in the pilot pattern d and the pilot information corresponding to the last column formed by the black grid may be determined as the first target pilot information.

S403, if the first comparison result is that the number of the target pilot symbols is greater than 2, determining the head and tail pilot information of the first target pilot information from the head and tail pilot information of the candidate pilot pattern, and determining the rest pilot information in the first target pilot information from the middle pilot information of the candidate pilot pattern.

The first and the last pilot frequency information of the candidate pilot frequency patterns are the earliest received pilot frequency information and the latest received pilot frequency information respectively, and the middle pilot frequency information of the candidate pilot frequency patterns is other pilot frequency information except the first and the last pilot frequency information in the candidate pilot frequency patterns. Optionally, in this embodiment, if the comparison result of the number of target pilot symbols and 2 is that the number of target pilot symbols is greater than 2, at this time, the head-tail pilot information of the candidate pilot pattern may be determined as the head-tail pilot information of the first target pilot information, and the remaining pilot information in the first target pilot information may be determined from other intermediate pilot information except the head-tail pilot information in the candidate pilot pattern according to the number of target pilot symbols. Further, when determining the remaining pilot information in the first target pilot information from the other intermediate pilot information except the first and second pilot information in the candidate pilot pattern according to the number of target pilot symbols, the remaining pilot information in the first target pilot information may be determined from the intermediate pilot information in the pilot pattern according to the index order of the intermediate pilot information in the pilot pattern, and as an alternative embodiment, the intermediate pilot information with the front index order may be determined as the remaining pilot information in the first target pilot information according to the index order of the intermediate pilot information in the pilot pattern. That is, the first symbol in the target pilot information fixedly selects the first available DMRS pilot symbol in the pilot information of the candidate pilot pattern, the last symbol fixedly selects the last available DMRS pilot symbol, and the middle DMRS pilot symbol selects the pilot symbol with smaller symbol index (i.e., can be received earlier) as much as possible. For example, assuming that the candidate pilot pattern is the candidate pilot pattern shown in fig. 1d, i.e., the candidate pilot pattern includes 4 pilot information, the DMRS occupies pilot symbols [ 25 811 ] and the number of target symbols is 3, the pilot information corresponding to the first column formed by the black lattice and the pilot information corresponding to the last column formed by the black lattice in fig. 1d may be determined as the head-to-tail pilot information of the first target pilot information, at this time, the pilot information corresponding to the number of target symbols remaining in the first target pilot information is not determined, the pilot information corresponding to the second column formed by the black lattice and the pilot information corresponding to the third column formed by the black lattice remaining in addition to the head-to-tail pilot information in the candidate pilot pattern shown in fig. 1d and the pilot information corresponding to the third column formed by the black lattice are determined as the pilot information with the first index order, and the pilot information corresponding to the second column formed by the black lattice in fig. d may be determined as the remaining pilot information in the first target pilot information, and the head-to-tail pilot information of the first target pilot information in the first target pilot information, i.e., the pilot information corresponding to the first DMRS may be determined as the pilot information with the first target symbol [ 11].

In this embodiment, for different comparison results of the number of target pilot symbols and the preset value 2, different determination methods may be used to determine the first target pilot information from the candidate pilot patterns included in the candidate pilot information.

In the above scenario of determining the number of target pilot symbols according to the reference signal sent by the base station, the number of pilot symbols configured by the base station may be determined according to the reference information sent by the base station, and then the number of target pilot symbols may be determined according to the determined number of pilot symbols configured by the base station and the number of candidate pilot symbols included in the candidate pilot information. In one embodiment, the candidate pilot information further includes a candidate pilot symbol number, as shown in fig. 6, and the step S202 includes:

s501, determining the number of predicted pilot symbols according to the reference signal.

Alternatively, the reference signal in this embodiment may be referred to the description of the reference signal in S202 above, that is, the reference signal may be various reference signals sent by the base station, for example, the reference signal may be the TRS signal above, etc. Optionally, in this embodiment, a doppler estimation algorithm may be used to estimate the reference signal, obtain a doppler estimation value D, and obtain the predicted pilot symbol number according to the doppler estimation value D. For example, if the doppler estimation value D is equal to or less than 0, determining the number of predicted pilot symbols to be 1; if the Doppler estimated value D is greater than 0 and less than or equal to 1, determining the number of predicted pilot symbols to be 2; if the Doppler estimated value D is more than 1 and less than or equal to 2, determining the number of predicted pilot symbols to be 3; if the Doppler estimation value D is other value, the number of predicted pilot symbols can be determined to be 4. Alternatively, the number of predicted pilot symbols in this embodiment may be equal to the number of target pilot symbols, or the number of predicted pilot symbols in this embodiment may be greater than the number of target pilot symbols.

S502, determining a second comparison result of the candidate pilot symbol number and the predicted pilot symbol number.

Alternatively, in this embodiment, the second comparison result of the number of candidate pilot symbols and the number of predicted pilot symbols may be obtained by obtaining a difference or a ratio of the number of candidate pilot symbols and the number of predicted pilot symbols. Alternatively, in this embodiment, the number of predicted pilot symbols may be equal to the number of candidate pilot symbols, or the number of predicted pilot symbols may be smaller than the number of candidate pilot symbols, or the number of predicted pilot symbols may be larger than the number of candidate pilot symbols, which is not limited in this embodiment.

S503, determining the number of target pilot symbols according to the second comparison result.

Alternatively, in this embodiment, if the second comparison result indicates that the number of predicted pilot symbols is less than or equal to the number of candidate pilot symbols, it is indicated that the number of pilot symbols predicted according to the reference signal does not exceed the number of candidate pilot symbols configured by the base station, and at this time, the number of predicted pilot symbols may be determined as the target number of pilot symbols.

Optionally, in this embodiment, if the second comparison result indicates that the number of predicted pilot symbols is greater than the number of candidate pilot symbols, the number of target pilot symbols may be determined according to the number of candidate pilot symbols, the number of predicted pilot symbols, and the number of pilot symbols that the channel estimation desires to use, and as an alternative implementation, the formula may be given by: numUseSymb =min (max (lowLimitDmrsSymb, min (numDopSymb, numDmrsSymb)), highLimitDmrsSymb), where numUseSymb represents the number of target pilot symbols, numDmrsSymb represents the number of candidate pilot symbols, numDopSymb represents the number of predicted pilot symbols, lowLimitDmrsSymb is the minimum number of pilot symbols expected to be used by the channel estimation module, may be configured to be 1 or 2 according to the system performance requirement, highlight DMRS is the maximum number of DMRS expected to be used by the channel estimation module, may be configured to be 3 or 4 according to the system performance requirement, and in addition, it should be noted that the configuration values of lowLimitDMRS and HIGHLIMITDMRS must be less than or equal to the number of candidate pilot symbols, that is, the determined number of target pilot symbols is less than or equal to the number of candidate pilot symbols.

In this embodiment, the number of predicted pilot symbols can be determined according to the reference signal sent by the base station, so that the number of target pilot symbols can be determined according to the second comparison result of the number of candidate pilot symbols configured by the base station and the number of predicted pilot symbols.

In some scenarios, the UE needs to perform signal demodulation in combination with channel estimation in addition to channel estimation, and in one embodiment, the method further includes: determining second target pilot frequency information according to the number of the candidate pilot frequency symbols and the candidate pilot frequency pattern information; the second target pilot information is used for signal demodulation.

The second target pilot information is pilot information for signal demodulation, which is the opposite process of signal modulation, and the signal modulation is simply to use the baseband signal to control (modulate) one or more parameters of the single-frequency carrier signal, so that the information to be transmitted is embedded in the modulated signal, and the demodulation is the opposite process of modulation.

In this embodiment, pilot information corresponding to the number of pilot symbols other than the number of pilot symbols in the candidate pilot pattern information may be determined as the second target pilot information, and by taking the pilot pattern information shown in fig. d in fig. 1 as the candidate pilot pattern information as an example, the columns formed by the black lattices shown in fig. 1 as candidate pilot symbols, that is, 4 candidate pilot symbols in the candidate pilot pattern information shown in fig. 1 d, pilot information corresponding to the remaining pilot symbols other than the 4 candidate pilot symbols may be determined as the second target pilot information for signal demodulation, and rate-release matching may be performed. Further, as an alternative implementation manner, the demodulation and decoding operations can be performed on the data of the input data position according to the channel estimation result and the de-rate matching result of the signal demodulation.

In this embodiment, the process of determining the second target pilot information for signal demodulation is relatively simple according to the number of candidate pilot symbols and the candidate pilot pattern information, so that the second target pilot information for signal demodulation can be quickly determined, and the efficiency of determining the second target pilot information is improved.

For the convenience of understanding of those skilled in the art, as shown in fig. 7, the following describes in detail the pilot information method provided in the present application in connection with a complete embodiment:

S1, according to RRC signaling and DCI information, the number numDmrsSymb of DMRS pilot symbols and pilot pattern information which are configured by a base station and used in the current slot are analyzed.

S2, doppler speed estimation is carried out based on Tracking Reference Signals (TRS), and gear division is carried out on Doppler estimation results, so that the number numDopSymb of predicted DMRS pilot frequencies used for channel estimation is generated.

S3, determining the number of pilots used for channel estimation according to numUseSymb =min (max (lowLimitDmrsSymb, min (numDopSymb, numDmrsSymb)) highLimitDmrsSymb, where numUseSymb is the number of pilots used for channel estimation, numDmrsSymb is the number of DMRS pilots actually configured in the current system analyzed in S1, numDopSymb is the number of predicted DMRS pilots obtained in S2, lowLimitDMRS is the number of minimum DMRS pilots expected to be used by the channel estimation module, and HIGHLIMITDMRS is the number of maximum DMRS pilots expected to be used by the channel estimation module.

S4, generating pilot frequency position indication. The generation principle of the pilot frequency position indication is as follows: the first available DMRS pilot symbol is fixedly selected by the first symbol, the last available DMRS pilot symbol is fixedly selected by the last symbol, and the pilot symbols with smaller symbol index (i.e. can be received earlier) are selected as much as possible by the middle DMRS pilot symbol. For example, the pilot symbol occupied by DMRS in the pilot pattern of the current system configuration is [ 25 8 11], and if the number of DMRS pilots used for the determined channel estimation=3, the generated pilot position is indicated as [ 25 11].

And S5, generating pilot pattern information for channel estimation according to the pilot pattern information of the system configuration output in the S1 and the pilot position indication output in the S3, and performing DMRS channel estimation.

S6, according to the pilot pattern of the system configuration output in S1, the pilot pattern is used for demodulation, and rate-de-matching is carried out.

And S7, demodulating and decoding the data of the input data position according to the channel estimation result output by the S5 and the rate-demodulation matching result output by the S6.

It should be noted that, for the description in the above S1-S7, reference may be made to the description related to the above embodiment, and the effects thereof are similar, which is not repeated here.

The following describes by way of example the beneficial effects produced by this solution: for a typical high-speed channel configuration of the NR system, for example, when the channel type is TDLB, 100-400, that is, the doppler value is 400Hz, the base station side typically uses 4 pilot symbols as a typical configuration of the DMRS, that is, the number of pilot symbols numDmrsSymb =4. At this time, taking the pilot pattern (d) in fig. 1 as an example, if the number numUseSymb =2, 3 or 4 of DMRS pilots used for channel estimation, the performance pairs of different pilot symbols under TDLB-400 channel conditions are shown in table 1:

TABLE 1

As can be seen from table 1, in a medium-high signal-to-noise ratio (SNR > =20db) scenario, the block error rate performance obtained using 3 DMRS pilot symbols [ 25 11] is close to the block error rate performance obtained using 4 DMRS pilot symbols [ 25 8 11], and is significantly better than the performance obtained using 2 DMRS pilot symbols [ 211 ]. Especially in the case of modulation coding scheme 20 (256 QAM), when 3 DMRS pilot symbols [ 25 ] or 4 DMRS pilot symbols [ 25 8 11] are used, the block error rate may be normally reduced, but the performance of using 2 DMRS pilot symbols [ 211 ] cannot be reduced. Therefore, it can be seen that when the typical middle and low frequency channel selection of NR and the Doppler value reaches about 400Hz, 3-symbol DMRS pilot frequency can be used to replace 4-symbol DMRS pilot frequency for channel estimation, so that the approximate block error rate performance is achieved, but the calculation power and the storage capacity of channel estimation are greatly saved. In this example, taking the current NR 3CC as an example, each CC resource is allocated with 273 Physical Resource Blocks (PRBs), and assuming that the base station side is configured to send 4 PDSCH DMRS pilot symbols per slot for each CC, on the UE side, by adopting the method provided by the embodiment of the present application, each CC uses only 3 pilot symbols to perform channel estimation, if the vDSP calculation force used for performing channel estimation by using one pilot symbol is about 1.2 ten thousand cycles (different vDSP calculation force, specific numbers may have a certain difference according to vDSP capability), if each CC uses less than 1 pilot symbol to perform channel estimation, a total of 3 CCs can be saved by about 3.6 ten thousand cycles. Assuming that the total number of cycles of one slot is 50 ten thousand, the vDSP calculation power and the corresponding storage amount of 7% are saved. For memory storage, the channel estimation storage amount of 1CC saves about 64 kbytes, the 3CC can save 192 kbytes altogether, considering the memory division, more storage amounts can be saved, and for each saved memory storage amount corresponding to one DMRS pilot symbol of the demodulation reference signal type1 (PDSCH DMRS TYPE 1) of the shared channel, the following table 2 is specifically shown:

TABLE 2

Further, fig. 8-11 show the difference in block error rate performance of 4, 3, and 2 DMRS pilot symbols when doppler configurations are 30Hz, 120Hz, 240Hz, and 400Hz, respectively, in the environment of typical channel TDLA for NR, as can be seen from the performance curves in fig. 8-11: under the environment of NR typical low-frequency channel selection scene TDLA, the channel estimation performance of 3 DMRS pilot symbols is close to that of 4 DMRS pilot symbols, and the loss is less than 0.1dB when the frequency is 120Hz or below; at 240Hz, the loss is about 0.15dB; at 400Hz, the loss is about 0.4dB; as the moving speed increases, the difference between the channel estimation performance of 2 DMRS pilot symbols and the channel estimation performance of 3/4 DMRS pilot symbols gradually increases, and when the Doppler value exceeds 200Hz, the channel estimation performance of 2 DMRS pilot symbols is obviously inferior to the channel estimation performance of 3/4 DMRS pilot symbols; in a high-speed scene, 3 DMRS pilot symbols can be used for replacing 4 DMRS pilot symbols, so that the aims of saving vDSP calculation power and memory storage capacity under the scene of small block error rate loss are fulfilled.

It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides a pilot information determining device for implementing the above-mentioned pilot information determining method. The implementation of the solution provided by the apparatus is similar to the implementation described in the above method, so the specific limitation in the embodiments of the pilot information determining apparatus or apparatuses provided below may refer to the limitation of the pilot information determining method hereinabove, and will not be repeated herein.

In one embodiment, as shown in fig. 12, there is provided a pilot information determining apparatus including: an acquisition module 10, a first determination module 11 and a second determination module 12, wherein:

And the acquisition module 10 is used for acquiring the candidate pilot frequency information configured by the base station according to the control information sent by the base station.

The first determining module 11 is configured to determine the target pilot symbol number according to the reference signal sent by the base station.

A second determining module 12, configured to determine first target pilot information from the candidate pilot information according to the target pilot symbol number; the first target pilot information is used for channel estimation.

The pilot information determining apparatus provided in this embodiment may execute the above method embodiment, and its implementation principle and technical effects are similar, and will not be described herein.

On the basis of the above embodiment, as shown in fig. 13, optionally, the above second determining module 12 includes: an acquisition unit 121 and a first determination unit 122, wherein:

The obtaining unit 121 is configured to compare the target pilot symbol number with a preset value, and obtain a first comparison result.

The first determining unit 122 is configured to determine first target pilot information from the candidate pilot information according to the first comparison result.

On the basis of the above embodiment, optionally, the preset value is 2, the candidate pilot information includes a candidate pilot pattern, and the first determining unit 122 is configured to determine, as first target pilot information, pilot information received first in the candidate pilot pattern if the first comparison result is that the target pilot symbol number is less than 2; if the first comparison result is that the number of the target pilot frequency symbols is equal to 2, determining pilot frequency information received first and received last in the candidate pilot frequency patterns as first target pilot frequency information; if the first comparison result is that the number of the target pilot frequency symbols is larger than 2, determining the head and tail pilot frequency information of the first target pilot frequency information from the head and tail pilot frequency information of the candidate pilot frequency pattern, and determining the rest pilot frequency information in the first target pilot frequency information from the middle pilot frequency information of the candidate pilot frequency pattern.

On the basis of the above embodiment, optionally, the above first determining unit 122 is configured to determine remaining pilot information in the first target pilot information from the intermediate pilot information of the candidate pilot pattern in the index order of the intermediate pilot information of the candidate pilot pattern.

On the basis of the foregoing embodiment, optionally, the candidate pilot information further includes a candidate pilot symbol number, as shown in fig. 14, and the first determining module 11 includes: a second determination unit 111, a third determination unit 112, and a fourth determination unit 113; wherein:

a second determining unit 111, configured to determine the number of predicted pilot symbols according to the reference signal.

A third determining unit 112 is configured to determine a second comparison result of the candidate pilot symbol number and the predicted pilot symbol number.

A fourth determining unit 113, configured to determine the target pilot symbol number according to the second comparison result.

On the basis of the above embodiment, optionally, the fourth determining unit 113 is configured to determine the number of predicted pilot symbols as the target number of pilot symbols if the second comparison result indicates that the number of predicted pilot symbols is less than or equal to the number of candidate pilot symbols; and if the second comparison result shows that the number of the predicted pilot frequency symbols is larger than the number of the candidate pilot frequency symbols, determining the target pilot frequency symbols according to the number of the candidate pilot frequency symbols, the number of the predicted pilot frequency symbols and the number of pilot frequency symbols expected to be used by channel estimation.

On the basis of the above embodiment, optionally, the second determining unit 111 is configured to estimate the reference signal by using a doppler estimation algorithm to obtain the number of predicted pilot symbols.

Optionally, as shown in fig. 15, the apparatus further includes: a third determination module 13, wherein:

a third determining module 13, configured to determine second target pilot information according to the number of candidate pilot symbols and the candidate pilot pattern information; the second target pilot information is used for signal demodulation.

The respective modules in the above pilot information determination means may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 16. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a pilot information determination method. The display unit of the computer device is used for forming a visual picture, and can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.

It will be appreciated by those skilled in the art that the structure shown in FIG. 16 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

The embodiment of the application also provides a computer readable storage medium. One or more non-transitory computer-readable storage media containing computer-executable instructions that, when executed by one or more processors, cause the processors to perform the steps of a pilot information determination method.

The embodiments of the present application also provide a computer program product containing instructions that, when run on a computer, cause the computer to perform a pilot information determination method.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. A pilot information determination method, comprising:

2. The method of claim 1, wherein said determining first target pilot information from said candidate pilot information based on said target pilot symbol number comprises:

comparing the target pilot frequency symbol number with a preset value to obtain a first comparison result;

and determining first target pilot frequency information from the candidate pilot frequency information according to the first comparison result.

3. The method of claim 2, wherein the predetermined number is 2, the candidate pilot information includes a candidate pilot pattern, and the determining the first target pilot information from the candidate pilot information according to the first comparison result includes:

if the first comparison result is that the number of the target pilot frequency symbols is smaller than 2, determining pilot frequency information received first in the candidate pilot frequency pattern as the first target pilot frequency information;

If the first comparison result is that the target pilot frequency symbol number is equal to 2, determining pilot frequency information received first and received last in the candidate pilot frequency pattern as the first target pilot frequency information;

And if the first comparison result is that the number of the target pilot symbols is greater than 2, determining the head and tail pilot information of the first target pilot information from the head and tail pilot information of the candidate pilot pattern, and determining the rest pilot information in the first target pilot information from the middle pilot information of the candidate pilot pattern.

4. The method of claim 3, wherein said determining remaining pilot information in said first target pilot information from among intermediate pilot information of said candidate pilot pattern comprises:

And determining the residual pilot information in the first target pilot information from the intermediate pilot information of the candidate pilot pattern according to the index sequence of the intermediate pilot information of the candidate pilot pattern.

5. The method according to claim 3 or 4, wherein the candidate pilot information further includes a candidate pilot symbol number, and the determining the target pilot symbol number according to the reference signal sent by the base station includes:

Determining the number of predicted pilot symbols according to the reference signal;

Determining a second comparison result of the number of candidate pilot symbols and the number of predicted pilot symbols;

And determining the target pilot frequency symbol number according to the second comparison result.

6. The method of claim 5, wherein said determining said target number of pilot symbols based on said second comparison result comprises:

if the second comparison result indicates that the number of the predicted pilot symbols is smaller than or equal to the number of the candidate pilot symbols, determining the number of the predicted pilot symbols as the number of the target pilot symbols;

And if the second comparison result shows that the number of the predicted pilot symbols is larger than the number of the candidate pilot symbols, determining the target number of pilot symbols according to the number of the candidate pilot symbols, the number of the predicted pilot symbols and the number of pilot symbols expected to be used by channel estimation.

7. The method of claim 6, wherein said determining a predicted number of pilot symbols from said reference signal comprises:

and estimating the reference signal by using a Doppler estimation algorithm to obtain the predicted pilot frequency symbol number.

8. The method of claim 5, wherein the method further comprises:

Determining second target pilot frequency information according to the number of the candidate pilot frequency symbols and the candidate pilot frequency pattern information; the second target pilot information is used for signal demodulation.

9. A pilot information determining apparatus, comprising:

10. An electronic device comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of the pilot information determination method according to any one of claims 1 to 8.

11. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 8.

12. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method of any one of claims 1 to 8.