CN117674928A

CN117674928A - Precoding matrix indicator PMI correction method and device, electronic equipment and storage medium

Info

Publication number: CN117674928A
Application number: CN202211040757.4A
Authority: CN
Inventors: 陆艺青
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2024-03-08

Abstract

The application discloses a Precoding Matrix Indicator (PMI) correction method, a device, electronic equipment and a storage medium, and relates to the technical field of communication. The specific implementation scheme is as follows: acquiring Channel State Information (CSI) reported by a terminal, wherein the CSI comprises a first PMI; under the condition that the RI value is mutated, acquiring historical CSI reported by a terminal in a historical manner; correcting the first PMI based on the historical CSI to obtain a second PMI; the second PMI is indicated to the terminal. By monitoring the RI value, under the condition that the RI value is suddenly changed, the first PMI is corrected by acquiring the historical CSI, but not by correcting the first PMI based on the current CSI in the prior art, the inaccuracy of the corrected second PMI caused by the error of the current first PMI due to the fluctuation of the transmission beam can be prevented, so that the accuracy of correcting the first PMI can be improved, and the transmission performance of the PDCCH can be improved.

Description

Precoding matrix indicator PMI correction method and device, electronic equipment and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a precoding matrix indicator PMI correction method, device, electronic apparatus, and storage medium.

Background

In the communication system, a base station performs precoding on a downlink control channel (Physical Downlink Control Channel, PDCCH) according to a PMI (Precoding Matrix Indicator ) in CSI (Channel State Information, channel state information) reported by a terminal, so as to obtain multi-antenna gain.

In some scenarios, an RI (Rank Indicator) value reported by CSI may be suddenly reported from Rank 1 or 2 to Rank 3 or 4, in the existing scheme, the scheduled PDCCH uses the beam of the first stream reported by PMI to perform precoding, and the beam of the first stream is not necessarily the target transmission beam at this time, so that the transmission performance of the PDCCH may be degraded, and the terminal may miss the DCI.

Disclosure of Invention

The application provides a Precoding Matrix Indicator (PMI) correction method, electronic equipment, device, electronic equipment and storage medium, which are used for solving the technical problems of poor PUCCH resource allocation flexibility, multiple required interaction times and large processing time delay in the related technology.

According to a first aspect of the present application, there is provided a precoding matrix indicator PMI correction method, the method including: acquiring Channel State Information (CSI) reported by a terminal, wherein the CSI comprises a first PMI; under the condition that the RI value is mutated, acquiring historical CSI reported by a terminal in a historical manner; correcting the first PMI based on the historical CSI to obtain a second PMI; the second PMI is indicated to the terminal.

In one embodiment of the present application, correcting the first PMI based on the historical CSI to obtain the second PMI includes: acquiring N transmission beams for transmission with a terminal, wherein N is a positive integer greater than or equal to 2; determining a target transmission beam from the N transmission beams based on the historical CSI; and correcting the first PMI based on the target transmission beam to obtain a second PMI.

In one embodiment of the present application, determining a target transmission beam from the N transmission beams based on the historical CSI includes: acquiring target information fields in a plurality of historical PMIs; determining the occurrence times of each transmission beam in a plurality of target information domains; and selecting the transmission beam with the largest occurrence number as a target transmission beam.

In one embodiment of the present application, determining the number of occurrences of each transmission beam in a plurality of target information domains includes: acquiring the port number in the historical CSI, a historical report value and a historical report RI value of a target information domain, and acquiring configuration data of an antenna; based on the port number, the historical report RI value, the configuration data and the historical report value, the occurrence times of each transmission beam in a plurality of target information domains are obtained.

In one embodiment of the present application, the historical report value is used to indicate at least one candidate transmission beam for transmission, and the number of occurrences of each transmission beam in a plurality of target information domains is obtained based on the port number, the historical report RI value, the configuration data, and the historical report value, including: determining indication conditions of candidate transmission beams according to the historical report values; according to the indication condition, determining index values of candidate transmission beams based on the port number, the historical report RI value, the configuration data and the historical report value; and obtaining the occurrence times of each transmission beam serving as the candidate transmission beam based on the index value of the candidate transmission beam.

In one embodiment of the present application, the candidate transmission beams include a first transmission beam and/or a second transmission beam, the method further comprising: when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining a first index value of the first transmission beam and a second index value of the second transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value; and respectively obtaining the occurrence times of each transmission beam serving as a candidate transmission beam based on the first index value and the second index value.

In an embodiment of the present application, the precoding matrix indicator PMI correction method further includes: when the indication condition is that only the first transmission beam exists, a first index value of the first transmission beam is determined based on the port number, the historical report RI value, the configuration data and the historical report value, and the number of times that each transmission beam appears as the first transmission beam is obtained based on the first index value.

In one embodiment of the present application, determining the indication of the candidate transmission beam according to the historical report value includes: determining a presence indication value of the second bit transmission beam based on the port number, the historical report RI value and the historical report value; and determining the second bit transmission beam as the existence indication condition of the candidate transmission beam according to the existence indication value, wherein the existence indication value is a set value, and whether the second bit transmission beam exists in the historical report value is represented.

In one embodiment of the present application, determining the presence indication value of the second bit transmission beam based on the number of ports, the historically reported RI value, and the historically reported value includes: under the condition that the port number is 4 and the historical report RI value is 2, determining the last bit of the historical report value as a presence indication value; and under the condition that the port number is 8 and the historical report RI value is 2, determining the last two bits of the historical report value as the presence indication value.

In one embodiment of the present application, based on the first index value and the second index value, the number of occurrences of each transmission beam as a candidate transmission beam is obtained, respectively, including: acquiring a third index value of a transmission beam; under the condition that the first index value is equal to the third index value, adding 1 to a first count value of the transmission beam corresponding to the third index value, wherein the first count value is used for indicating the number of times that the transmission beam is used as a first transmission beam; and adding 1 to a second count value of the transmission wave corresponding to the third index value when the second index value is equal to the third index value, wherein the second count value is used for indicating the number of times that the transmission wave beam is used as the second bit transmission wave beam.

In one embodiment of the present application, based on the first index value, obtaining the number of times each transmission beam appears as the first transmission beam includes: acquiring a third index value of a transmission beam; and when the first index value is equal to the third index value, adding 1 to the first count value of the transmission beam corresponding to the third index value.

In one embodiment of the present application, selecting the transmission beam with the largest occurrence number as the target transmission beam includes: when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining the largest count value in the first count value and the second count value as a target count value; when the indication condition is that only the first transmission beam exists, determining the largest count value in the first count values as a target count value; and determining the transmission beam corresponding to the target count value as a target transmission beam.

In one embodiment of the present application, determining the first index value includes: determining an offset value based on the number of ports and the historically reported RI value; the historical report value is shifted right by the bit number of the offset value size to determine a first index value.

In one embodiment of the present application, the configuration data includes a first oversampling factor, a first antenna port number, a second oversampling factor, and a second antenna port number, determining a second cableA primer, comprising: determining a second index value based on the number of ports, the historical report value, the offset value, the first oversampling factor, the first antenna port number, the second oversampling factor, and the second antenna port number; the formula for obtaining the second index value includes: in the case of 4 ports and a historically reported RI of 2, bem2=mode ((ReportPmiX 1 > p) +o ₁ ，O ₁ *N ₁ ) The method comprises the steps of carrying out a first treatment on the surface of the Or, in case that the number of ports is 8 and the historically reported RI value is 2,

wherein ReportPmiX1 is a historical report value, p is an offset value in the case of 4 ports, q is an offset value in the case of 8 ports, beam2 is a second index value, O ₁ For the first oversampling factor, N ₁ For the first antenna port number, O ₂ For a second oversampling factor, N ₂ The second antenna port number.

In one embodiment of the present application, correcting the first PMI based on the target transmission beam to obtain the second PMI includes: determining a fourth index value of a current first transmission beam currently selected by the terminal based on the first PMI; determining whether the current first transmission beam is near the target transmission beam based on the index value of the target transmission beam and the fourth index value; under the condition that the current first transmission beam is near the target transmission beam, correcting the first PMI based on the current first transmission beam to obtain a second PMI; and under the condition that the current first transmission beam is not near the target transmission beam, correcting the first PMI based on the target transmission beam to obtain a second PMI.

In one embodiment of the present application, determining whether the current first transmission beam is in the vicinity of the target transmission beam based on the index value of the target transmission beam and the fourth index value includes: determining an absolute value of a difference between the index value of the target transmission beam and the fourth index value; and under the condition that the absolute value of the difference value is smaller than the set threshold value, determining that the current first transmission beam is near the target transmission beam.

In one embodiment of the present application, determining, based on the first PMI, a fourth index value of a current first transmission beam currently selected by the terminal includes: acquiring a current report value of a target information domain of the first PMI; determining a current reporting offset value based on the number of ports and the current reporting RI value; and right shifting the current reported value by the bit number of the current reported offset value to determine a fourth index value.

In one embodiment of the present application, determining that the current RI value is mutated includes: and under the condition that the current RI value is not 1, determining that the current RI value is mutated.

According to a second aspect of the present application, there is provided another precoding matrix indicator PMI correction method, the method including: the first acquisition module is used for acquiring Channel State Information (CSI) reported by the terminal, wherein the CSI comprises a first PMI; the second acquisition module is used for acquiring historical CSI reported by the terminal history under the condition that the RI value is suddenly changed; the correction module is used for correcting the first PMI based on the historical CSI to obtain a second PMI; and the indication module is used for indicating the second PMI to the terminal.

In one embodiment of the present application, the correction module is further configured to: acquiring N transmission beams for transmission with a terminal, wherein N is a positive integer greater than or equal to 2; determining a target transmission beam from the N transmission beams based on the historical CSI; and correcting the first PMI based on the target transmission beam to obtain a second PMI.

In one embodiment of the present application, the correction module is further configured to: acquiring target information fields in a plurality of historical PMIs; determining the occurrence times of each transmission beam in a plurality of target information domains; and selecting the transmission beam with the largest occurrence number as a target transmission beam.

In one embodiment of the present application, the correction module is further configured to: acquiring the port number in the historical CSI, a historical report value and a historical report RI value of a target information domain, and acquiring configuration data of an antenna; and obtaining the occurrence times of each transmission beam in a plurality of target information domains based on the port number, the historical report RI value, the configuration data and the historical report value.

In one embodiment of the present application, the historical report value is used to indicate at least one candidate transmission beam for transmission, and the correction module is further used to: determining indication conditions of candidate transmission beams according to the historical report values; according to the indication condition, determining index values of candidate transmission beams based on the port number, the historical report RI value, the configuration data and the historical report value; and obtaining the occurrence times of each transmission beam serving as the candidate transmission beam based on the index value of the candidate transmission beam.

In one embodiment of the present application, the candidate transmission beam includes a first transmission beam and/or a second transmission beam, and the correction module is further configured to: when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining a first index value of the first transmission beam and a second index value of the second transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value; and respectively obtaining the occurrence times of each transmission beam serving as a candidate transmission beam based on the first index value and the second index value.

In one embodiment of the present application, the correction module is further configured to: when the indication condition is that only the first transmission beam exists, determining a first index value of the first transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value, and respectively obtaining the number of times that each transmission beam appears as the first transmission beam based on the first index value.

In one embodiment of the present application, the correction module is further configured to: determining a presence indication value of the second bit transmission beam based on the port number, the historical report RI value and the historical report value; and determining the second bit transmission beam as the existence indication condition of the candidate transmission beam according to the existence indication value, wherein the existence indication value is a set value, and whether the second bit transmission beam exists in the historical report value is represented.

In one embodiment of the present application, the correction module is further configured to: under the condition that the port number is 4 and the historical report RI value is 2, determining the last bit of the historical report value as a presence indication value; and under the condition that the port number is 8 and the historical report RI value is 2, determining the last two bits of the historical report value as the presence indication value.

In one embodiment of the present application, the correction module is further configured to: acquiring a third index value of a transmission beam; under the condition that the first index value is equal to the third index value, adding 1 to a first count value of the transmission beam corresponding to the third index value, wherein the first count value is used for indicating the number of times that the transmission beam is used as a first transmission beam; and adding 1 to a second count value of the transmission wave corresponding to the third index value when the second index value is equal to the third index value, wherein the second count value is used for indicating the number of times that the transmission wave beam is used as the second bit transmission wave beam.

In one embodiment of the present application, the correction module is further configured to: acquiring a third index value of a transmission beam; and when the first index value is equal to the third index value, adding 1 to the first count value of the transmission beam corresponding to the third index value.

In one embodiment of the present application, the correction module is further configured to: when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining the largest count value in the first count value and the second count value as a target count value; when the indication condition is that only the first transmission beam exists, determining the largest count value in the first count values as a target count value; and determining the transmission beam corresponding to the target count value as a target transmission beam.

In one embodiment of the present application, the correction module is further configured to: determining an offset value based on the number of ports and the historically reported RI value; the historical report value is shifted right by the bit number of the offset value size to determine a first index value.

In one embodiment of the present application, the configuration data includes a first oversampling factor, a first antenna port number, a second oversampling factor, and a second antenna port number, the correction module further configured to: determining a second index value based on the number of ports, the historical report value, the offset value, the first oversampling factor, the first antenna port number, the second oversampling factor, and the second antenna port number; the formula for obtaining the second index value includes: in the case where the number of ports is 4 and the historically reported RI value is 2, beam 2 = mode ((repotpnix 1 > p) +o1, O1 x N1); or, in case that the number of ports is 8 and the historically reported RI value is 2,

In one embodiment of the present application, the correction module is further configured to: determining a fourth index value of a current first transmission beam currently selected by the terminal based on the first PMI; determining whether the current first transmission beam is near the target transmission beam based on the index value of the target transmission beam and the fourth index value; under the condition that the current first transmission beam is near the target transmission beam, correcting the first PMI based on the current first transmission beam to obtain a second PMI; and under the condition that the current first transmission beam is not near the target transmission beam, correcting the first PMI based on the target transmission beam to obtain a second PMI.

In one embodiment of the present application, the correction module is further configured to: determining an absolute value of a difference between the index value of the target transmission beam and the fourth index value; and under the condition that the absolute value of the difference value is smaller than the set threshold value, determining that the current first transmission beam is near the target transmission beam.

In one embodiment of the present application, the correction module is further configured to: acquiring a current report value of a target information domain of the first PMI; determining a current reporting offset value based on the number of ports and the current reporting RI value; and right shifting the current reported value by the bit number of the current reported offset value to determine a fourth index value.

In one embodiment of the present application, the second obtaining module is further configured to: and under the condition that the current RI value is not 1, determining that the current RI value is mutated.

According to a third aspect of the present application, there is provided an electronic device comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the data processing method according to the embodiment of the first aspect of the present application.

According to a fourth aspect of the present application, there is provided a processor readable storage medium storing a computer program for causing the processor to execute the data processing method according to the embodiment of the first aspect.

According to a fifth aspect of the present application, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the data processing method according to the embodiments of the first aspect.

The technical scheme provided by the embodiment of the application at least brings the following beneficial effects: by monitoring the RI value, under the condition that the RI value is suddenly changed, the first PMI is corrected by acquiring the historical CSI, but not by correcting the first PMI based on the current CSI in the prior art, the inaccuracy of the second PMI caused by the error of the data in the current CSI can be prevented, so that the accuracy of correcting the first PMI can be improved, and the transmission performance of the PDCCH is improved.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a flowchart of a precoding matrix indicator PMI correction method according to an embodiment of the present application;

FIG. 2 is a flow chart of a PMI correction method according to the current technology of the present application;

fig. 3 is a flowchart illustrating a precoding matrix indicator PMI correction method according to another embodiment of the present application;

Fig. 4 is a flowchart of a precoding matrix indicator PMI correction method according to another embodiment of the present application;

fig. 5 is a schematic block diagram of the overall flow of a precoding matrix indicator PMI correction method according to another embodiment of the present application;

fig. 6 is a schematic block flow diagram of acquiring the number of occurrences of each transmission beam as a candidate transmission beam according to another embodiment of the present application

Fig. 7 is a block diagram of a structure of a precoding matrix indicator PMI correction apparatus according to an embodiment of the present application;

fig. 8 is a block diagram of an electronic device according to one embodiment of the present application.

Detailed Description

In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The embodiment of the application provides a Precoding Matrix Indicator (PMI) correction method, electronic equipment, device, electronic equipment and storage medium, which are used for solving the problems that in the related technology, due to the mutation of an RI reported value, when the PMI needs to be corrected, a first transmission beam is not a target transmission beam, the corrected PMI has errors, the transmission performance of a Physical Downlink Control Channel (PDCCH) is deteriorated, and a terminal fails to detect DCI.

The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

Fig. 1 is a flowchart of a precoding matrix indicator PMI correction method according to an embodiment of the present application, as shown in the drawing.

S101, obtaining Channel State Information (CSI) reported by a terminal, wherein the CSI comprises a first PMI.

It should be noted that the technical solution of the embodiments of the present application may be applicable to a new air interface (NR) system of 5G, but not only to a 5G NR system, but also to other communication systems or other future new mobile communication systems, etc., which are not limited in any way herein.

Taking a 5G NR system as an example, after performing codebook Rank adaptation and codebook and non-codebook adaptation, a base station side of the existing NR system needs to correct the PMI value because the PMI value in the channel state information CSI reported by the terminal and the PMI value used when the base station schedules the PDCCH are inconsistent, so that the PMI value is consistent with the Rank value corresponding to the scheduling, where the PMI correction period is equal to the CSI reporting period (i.e., rank reporting period).

The CSI is a channel attribute of the communication link. It describes the attenuation factor of the signal on each transmission path, i.e. the value of each element in the channel gain matrix H, such as signal Scattering (Scattering), environmental attenuation (coding, multipath fading or shadowing fading), distance attenuation (power decay of distance), etc. The CSI may adapt the communication system to the current channel conditions, providing a guarantee for high reliability and high rate communication in a multi-antenna system.

A precoding matrix indicator (PrecodingMatrixIndicator, PMI) indicates the precoding matrix employed for the operation of closed-loop spatial multiplexing of a downlink Multiple-Input Multiple-Out-put (MIMO) system. The precoding codebook has different sizes according to the number of antennas and streams. For example, in the case of 4 antennas, the codebook size is equal to 16, and 4 bits are used for the corresponding PMI feedback; in the case of 2 antennas, the codebook size of 1/2 stream is 4 and 2, respectively, and 2 or 1 bits are used for the corresponding PMI feedback.

S102, under the condition that the RI value is suddenly changed, historical CSI reported by the terminal in a historical mode is obtained.

The CSI contains RI (Rank Indicator), layer number indication. The method comprises the steps that a terminal device (UE) measures a transmission channel, determines the rank of the transmission channel, and reports RI information to a base station to assist the base station in downlink scheduling. Meanwhile, in any transmission mode, the UE shall report a channel quality indicator (CQI: channel Quality Indicator), and in the closed-loop spatial diversity mode, the UE shall also transmit Precoding Matrix Index (PMI) information.

The base station periodically or aperiodically transmits the CSI RS, the terminal measures the CSI RS according to the timing to obtain a measurement result, then reports RI/PMI/CQI, the base station receives the RI/PMI/CQI reported by the terminal, then determines the scheduling stream number according to the RI, determines the scheduling MCS according to relevant information such as the CQI, and determines the weight used by the downlink industry according to the PMI. If the terminal measurement is inaccurate, the measured RI is higher, the base station can only trust the measurement information of the terminal according to the flow, and the base station selects higher flow number scheduling, which is not matched with the actual channel condition, so that the shaping gain received by the terminal side is smaller, and the performance is poorer; in practice, if the terminal can report the low RI and related information that are more matched with the channel, the terminal side can receive larger shaping gain, and the performance of the base station when scheduling the low RI is better than that of the high RI.

In the embodiment of the present application, when the RI value is greater than the set threshold, the RI value may be considered to be mutated. It should be understood that under different conditions, the set threshold may be different, for example, the set threshold corresponding to different communication systems may be different, the set threshold corresponding to different numbers of ports may be different, etc., which is not limited herein, and may be specifically set according to actual design requirements.

It should be noted that, the historical CSI may be obtained by obtaining CSI information in a set time before the current time as the historical CSI. The setting time is set in advance and can be changed according to actual setting requirements.

Optionally, the CSI information of a set number before the CSI information currently reported may also be obtained as the historical CSI. The number of settings is set in advance, and can be changed according to actual setting requirements, and is not limited in any way.

S103, correcting the first PMI based on the historical CSI to obtain a second PMI.

In the case of determining the RI mutation, the first PMI needs to be corrected. In the PMI correction method in the prior art, no matter when the RI value is 1, 2, 3 or 4, precoding is performed through the currently reported CSI, but the coding modes are different.

As shown in fig. 2, where ReportRi represents the currently reported RI; reportPmiX1 represents the current reported first information field X1 value; reportPmiX2 represents the current reported value of the second information field X2; the restrtpmix 1[0] represents the first transmission beam X1 value in the first information domain after reconstruction, and the restrtpmix 1[1] represents the second transmission beam X1 value in the first information domain after reconstruction; the restrtpmix 2[0] represents the first transmission beam X2 value in the reconstructed second information domain, and the restrtpmix 2[1] represents the second transmission beam X2 value in the reconstructed second information domain. This correction is performed by default that the first transmission beam in the CSI is the target transmission beam. However, in some cases, when the RI value is suddenly changed, there is a case that the transmission beam fluctuates, and there is a possibility that the first transmission beam in the CSI is not necessarily the target transmission beam, so that the accuracy of the corrected second PMI may be affected.

In the embodiment of the present application, whether the data in the first PMI has a deviation may be determined by analyzing the history information. If the first PMI is determined to have deviation based on the historical CSI, the first PMI is corrected, and a second PMI is generated to ensure the stability of PDCCH transmission. Therefore, the problem that the transmission performance of PDCCH is poor due to error of the currently reported CSI or deviation of a correction value of the PMI caused by the fact that the currently reported first transmission beam is not the target transmission beam can be prevented, and the terminal can miss the downlink control information (Downlink Control Information, DCI).

In the embodiment of the present application, the information of the historically reported transmission beams may be determined based on the historical CSI, and the target transmission beam in the historically reported transmission beams may be determined based on a preset condition. It should be noted that, the preset condition may be the number of times that the transmission beam appears in the CSI information, the PMI reported by the transmission beam, and so on.

S104, indicating the second PMI to the terminal.

After acquiring the second PMI, the base station generates a downlink channel state information reference signal (channelstate information reference signal, CSI-RS) based on the second PMI and sends the downlink channel state information reference signal to the terminal equipment. The terminal equipment estimates a downlink channel according to the received downlink CSI-RS, then picks out a codeword which is most matched with the downlink channel from a pre-defined codebook set, and finally feeds the picked codeword back to the network equipment through an uplink channel.

In the embodiment of the application, firstly, channel State Information (CSI) reported by a terminal is obtained, wherein the CSI comprises a first PMI, then, under the condition that an RI value is suddenly changed, historical CSI reported by the terminal in a historical manner is obtained, then, based on the historical CSI, the first PMI is corrected to obtain a second PMI, and finally, the second PMI is indicated to the terminal. By monitoring the CSI, under the condition that the RI value is suddenly changed, the first PMI is corrected by acquiring the historical CSI, but not by correcting the first PMI based on the current CSI in the prior art, the inaccuracy of the corrected second PMI caused by the deviation of the data in the current CSI can be prevented, so that the accuracy of correcting the first PMI can be improved, and the transmission performance of the PDCCH can be improved.

In the above embodiment, the first PMI is corrected based on the historical CSI to obtain the second PMI, which may be further explained by fig. 3, the method includes:

s301, N transmission beams used for transmission with a terminal are acquired, wherein N is a positive integer greater than or equal to 2.

In this embodiment of the present application, each transmission beam is correspondingly provided with an index value, and the index value corresponding to each transmission beam is different.

Correspondingly, the mapping relation between the index values of the N transmission beams and the N transmission beams is stored at the base station side and the terminal side. Accordingly, the corresponding transmission beam may be determined by determining the index value.

In the embodiment of the present application, N transmission beams for transmission with a terminal may be obtained by retrieving mapping relationships of N transmission beams on a base station side and a terminal side.

S302, determining a target transmission beam from N transmission beams based on the historical CSI.

In the embodiment of the present application, a plurality of historical PMI values may be determined based on the historical CSI, then a target information field in the plurality of historical PMIs may be determined based on the historical PMIs, then the occurrence number of each transmission beam in the plurality of target information fields may be determined, and finally the transmission beam with the largest occurrence number may be selected as the target transmission beam.

The information field is defined in the protocol, and includes related parameters for describing the transmission beam in the PMI, and the target information field includes a historical report value, where the historical report value is generated based on beam information of the transmission beam reported in the history. The PMI may include a plurality of information fields, and generally includes a first information field as a target information field and a second information field as a second information field.

And determining the occurrence times of N transmission beams in the target information domain by processing the historical report values, and taking the transmission beam with the largest occurrence times as the target transmission beam.

Optionally, the number of occurrences of each transmission beam in the multiple target information domains may be obtained by obtaining the number of ports in the historical CSI, the historical reporting value of the target information domain, and the historical reporting RI value, and obtaining configuration data of the antenna, based on the number of ports, the historical reporting RI value, the configuration data, and the historical reporting value.

S303, correcting the first PMI based on the target transmission beam to obtain a second PMI.

In the embodiment of the present application, after the target transmission beam is acquired, whether the currently reported first transmission beam is stable may be determined based on the target transmission beam and the currently reported first transmission beam.

Alternatively, it may be determined whether the current first transmission beam is stable by determining whether the currently reported first transmission beam is in the vicinity of the target propagation beam.

When the current reporting first transmission beam is near the target transmission beam, the reporting beam is considered to be stable, so that the existing PMI reconstruction value can be reserved, namely, the current reporting first transmission beam is adopted for PDCCH shaping, and the stability and the accuracy of PDCCH sending can be ensured.

When the current reporting first transmission beam is not near the target transmission beam, the current reporting is considered to be unstable, and the beam instability condition when the RI mutation occurs, and the first PMI needs to be corrected according to the target transmission beam determined in the historical CSI so as to obtain the second PMI. Therefore, the problem of the decline of the PDCCH forming performance caused by inaccurate wave beams when the terminal reports RI mutation can be avoided, and the PDCCH transmission performance is improved.

In the embodiment of the present application, the correction methods of the first PMI may be different with different port numbers and different reported RI values. For 4 or 8 port CSI-RS single stream (ri=1), the reported single stream PMI parameter is directly adopted as the single stream PDCCH PMI modifier value. The specific implementation method comprises the following steps: resuctpmix 1[0] =reportpmix 1, resuctpmix 2[0] =reportpmix 2. Wherein, resportPmiX 1[0] is the reconstruction value of the first transmission beam in the target information domain, reportPmiX1 is the report value of the first transmission beam in the target information domain, resportPmiX 2[0] is the reconstruction value of the first transmission beam in the second information domain, and ReportPmiX2 is the report value of the first transmission beam in the second information domain.

For 4 or 8 port CSI-RS multiflows (RI=2/3/4), the first transmission beam in the reported multiflow PMI parameters is taken as a single-stream PDCCH PMI reconstruction value. The specific implementation method comprises the following steps: for two streams with 4 ports, the reconstruction value of the first transmission beam in the target information domain is that the reported value of the first transmission beam in the target information domain is shifted to the right by 1 bit, and the resuctpmix 1[0] =reportpmix 1> >1, and the resuctpmix 2[0] =reportpmix 2; for a 4-port 3 or 4-stream, retutpmix 1[0] =reportpmix 1, retutpmix 2[0] =reportpmix 2; for 8-port 2 streams or 3 streams or 4 streams, restpmix 1[0] =reportpmix 1> >2, restpmix 2[0] =reportpmix 2.

In the embodiment of the present application, N transmission beams for transmission with a terminal are first acquired, N is a positive integer greater than or equal to 2, then, based on historical CSI, a target transmission beam is determined from the N transmission beams, and finally, based on the target transmission beam, the first PMI is modified to acquire the second PMI. By determining the target transmission beam in the historical CSI and correcting the first PMI based on the target transmission beam, a more accurate second PMI can be obtained, and compared with a traditional method for correcting the first PMI based on the current first transmission beam, the method can avoid the possibility of errors of the current first transmission beam.

It should be noted that, based on the index value of the target transmission beam and the fourth index value, whether the current first transmission beam is near the target transmission beam is determined, by determining the absolute value of the difference between the index value of the target transmission beam and the fourth index value, and if the absolute value of the difference is smaller than the set threshold, determining that the current first transmission beam is near the target transmission beam. The determination can be made by the following formula:

|beamMax-beam1|≤L

it should be noted that, beam1 is the fourth index value of the current first transmission beam, and L is the set threshold. The set threshold value is set in advance, and may be changed according to actual design requirements, and is not limited in any way.

In the above embodiment, the number of occurrences of each transmission beam in the multiple target information domains is obtained based on the number of ports, the historical report RI value, the configuration data and the historical report value, and may be further explained based on fig. 3, and the method includes:

s401, determining indication conditions of candidate transmission beams according to the historical report values.

It should be noted that the historical report value is used to indicate at least one candidate transmission beam for transmission. It should be noted that, the history report value includes at least beam information indicating the first transmission beam, and when the second bit beam exists in the history PMI, the history report value also indicates the second bit transmission beam.

In this embodiment of the present application, according to the historical report value, the indication condition of the candidate transmission beam is determined, and the presence indication value of the second bit transmission beam may be determined first based on the number of ports, the historical report RI value and the historical report value, and then the presence indication value is determined according to the presence indication value, where the presence indication value is a set value, and whether the second bit transmission beam exists in the historical report value is represented.

When the number of ports is 4 and the historical report RI value is 2, the last bit of the historical report value is determined to be the presence indication value, and when the indication value is 1, the second bit beam may be considered to be present. In the case where the number of ports is 8 and the history report RI value is 2, the last two bits of the history report value are determined to be the presence indication value, and when the indication value is 11, the second bit beam can be considered to be present.

In the embodiment of the present application, the presence indication value may also be determined based on the port number, the historical report RI value, the configuration data, and the historical report value, and may be obtained by the following formula:

for a 4-port CSI-RS two-stream,

when 0 b1=0, the PMI may be considered to contain no second bit beam.

For an 8-port CSI-RS two stream,

when 0b11=0, then the PMI may be considered to contain no second bit beam.

Wherein O is ₁ For the first oversampling factor, N ₁ For the first antenna port number, O ₂ For a second oversampling factor, N ₂ For the second antenna port number, 0b1 is an indication value corresponding to two streams of 4-port CSI-RS, and 0b2 is an indication value corresponding to two streams of 8-port CSI-RS.

S402, according to the indication condition, determining index values of candidate transmission beams based on the port number, the historical report RI value, the configuration data and the historical report value.

In the embodiment of the present application, the methods for determining the index value of the candidate transmission beam by using different port numbers, historical report RI values, configuration data and historical report values may be different.

When the indication condition is that only the first transmission beam exists, only the first index value of the first transmission beam is needed to be determined based on the port number, the historical report RI value, the configuration data and the historical report value. In the embodiment of the application, the offset value may be determined firstly based on the port number and the historical report RI value, and then the historical report value is shifted to the right by the bit number of the offset value to determine the first index value. It is to be appreciated that the number of ports and reporting RI to the corresponding offset value may be different, for example, when the offset value is 1 for two streams of 4-port CSI-RS, the beam1=reportpmix1 > 1. For two 8-port CSI-RS streams, the offset value may be 2, beam1=repotpmix1 > 2.

When the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, the first index value of the first transmission beam and the second index value of the second transmission beam need to be determined based on the port number, the historical report RI value, the configuration data and the historical report value. In this embodiment of the present application, the second index value may be determined based on the number of ports, the historical report value, the offset value, the first oversampling factor, the first antenna port number, the second oversampling factor, and the second antenna port number, where the formula for obtaining the second index value is: in the case where the number of ports is 4 and the historically reported RI value is 2,

beam 2＝mode((ReportPmiX1＞＞p)+O ₁ ，O ₁ *N ₁ )；

in the case where the number of ports is 8 and the historically reported RI value is 2,

wherein, reportPmiX1 is a historical report valueP is the offset value in the case of 4 ports, q is the offset value in the case of 8 ports, beam2 is the second index value, O ₁ N1 is the first antenna port number, O ₂ For a second oversampling factor, N ₂ The second antenna port number.

S403, based on the index value of the candidate transmission beam, the number of times that each transmission beam appears as the candidate transmission beam is obtained.

In this embodiment of the present application, first, the third index value of the transmission beam is obtained, the index value of the candidate transmission beam and the index value of each transmission beam may be compared, and when the index value of the candidate transmission beam and the index value of each transmission beam are equal, the transmission beam may be considered as the first transmission beam or the second transmission beam in the corresponding historical CSI.

When the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, the first count value of the transmission beam corresponding to the third index value is added with 1 when the first index value is equal to the third index value, and the first count value is used for indicating the number of times that the first transmission beam is used as a candidate transmission beam.

When the second index value is equal to the third index value, the second count value of the transmission wave corresponding to the third index value is increased by 1, and the second count value is used for indicating the number of times that the second bit transmission beam is used as a candidate transmission beam.

n(beam1)＝n(beam1)+1

n(beam2)＝n(beam2)+1

When the indication condition is that only the first transmission beam exists, the first count value of the transmission beam corresponding to the third index value is increased by 1 when the first index value is equal to the third index value.

n(beam1)＝n(beam1)+1

Wherein n (beam 1) is a first count value, and n (beam 2) is a second count value.

In the embodiment of the application, firstly, according to the historical report value, determining the indication condition of the candidate transmission beam, then, according to the indication condition, determining the index value of the candidate transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value, and finally, based on the index value of the candidate transmission beam, obtaining the occurrence times of each transmission beam as the candidate transmission beam. Therefore, through determining the indication condition of the candidate transmission beams, the number of times that each transmission beam appears as the candidate transmission beam under different transmission conditions can be accurately determined, and a basis is provided for the subsequent more accurate analysis of the target transmission beam.

After the number of occurrences of each transmission beam as a candidate transmission beam is acquired, the transmission beam having the largest number of occurrences may be taken as the target transmission beam.

Specifically, when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, the largest count value of the first count value and the second count value is determined to be the target count value, and when the indication condition is that only the first transmission beam exists, the largest count value of the first count value is determined to be the target count value, and the transmission beam corresponding to the target count value is determined to be the target transmission beam.

Fig. 5 is an overall flowchart of a precoding matrix indicator PMI correction method according to another embodiment of the present application. Firstly, channel State Information (CSI) reported by a terminal is acquired, whether the RI value is suddenly changed is judged, history CSI historically reported by the terminal is acquired under the condition that the RI value is suddenly changed, a target transmission beam is determined based on the CSI, a currently reported first transmission beam is acquired, when judging whether the first transmission beam is near the target transmission beam, when the first transmission beam is near the target transmission beam, the first PMI is reconstructed based on the current first transmission beam, when the first transmission beam is not near the target transmission beam, the first PMI is reconstructed based on the target transmission beam, and a corrected second PMI is indicated to the terminal.

Fig. 6 is a flow chart of acquiring the number of occurrences of each transmission beam as a candidate transmission beam according to another embodiment of the present application, as shown in fig. 6. First, determining an RI value, when the RI value is 1, recording a beam index, accumulating the number of occurrences of the beam, when the RI value is not 1, determining the number of times of the transmission wave as the first transmission beam based on the index value of the first transmission beam and the index value of the transmission beam, and determining the number of times of the transmission wave as the second transmission beam based on the index value of the second transmission beam and the index value of the transmission beam.

Corresponding to the precoding matrix indication PMI correction method provided by the above embodiments, an embodiment of the present disclosure further provides a precoding matrix indication PMI correction device, and since the precoding matrix indication PMI correction device provided by the embodiment of the present disclosure corresponds to the precoding matrix indication PMI correction method provided by the above embodiments, the implementation of the precoding matrix indication PMI correction method is also applicable to the precoding matrix indication PMI correction device provided by the embodiment of the present disclosure, and will not be described in detail in the following embodiments.

Fig. 7 is a block diagram of a precoding matrix indicator PMI correction device according to another embodiment of the present application.

As shown in fig. 7, a precoding matrix indicator PMI correction apparatus 700 according to an embodiment of the present application includes: a first acquisition module 710, a second acquisition module 720, a correction module 730, and an indication module 740.

The first obtaining module 710 is configured to obtain channel state information CSI reported by the terminal, where the CSI includes a first PMI.

The second obtaining module 720 is configured to obtain the historical CSI reported by the terminal history in the case that the RI value is suddenly changed.

The correction module 730 is configured to correct the first PMI based on the historical CSI to obtain a second PMI.

An indicating module 740, configured to indicate the second PMI to the terminal.

In one embodiment of the present application, the correction module 730 is further configured to: acquiring N transmission beams for transmission with a terminal, wherein N is a positive integer greater than or equal to 2; determining a target transmission beam from the N transmission beams based on the historical CSI; and correcting the first PMI based on the target transmission beam to obtain a second PMI.

In one embodiment of the present application, the correction module 730 is further configured to: acquiring target information fields in a plurality of historical PMIs; determining the occurrence times of each transmission beam in a plurality of target information domains; and selecting the transmission beam with the largest occurrence number as a target transmission beam.

In one embodiment of the present application, the correction module 730 is further configured to: acquiring the port number in the historical CSI, a historical report value and a historical report RI value of a target information domain, and acquiring configuration data of an antenna; and obtaining the occurrence times of each transmission beam in a plurality of target information domains based on the port number, the historical report RI value, the configuration data and the historical report value.

In one embodiment of the present application, the historical report value is used to indicate at least one candidate transmission beam for transmission, and the correction module 730 is further configured to: determining indication conditions of candidate transmission beams according to the historical report values; according to the indication condition, determining index values of candidate transmission beams based on the port number, the historical report RI value, the configuration data and the historical report value; and obtaining the occurrence times of each transmission beam serving as the candidate transmission beam based on the index value of the candidate transmission beam.

In one embodiment of the present application, the candidate transmission beams include a first transmission beam and/or a second transmission beam, and the correction module 730 is further configured to: when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining a first index value of the first transmission beam and a second index value of the second transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value; and respectively obtaining the occurrence times of each transmission beam serving as a candidate transmission beam based on the first index value and the second index value.

In one embodiment of the present application, the correction module 730 is further configured to: when the indication condition is that only the first transmission beam exists, determining a first index value of the first transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value, and respectively obtaining the number of times that each transmission beam appears as the first transmission beam based on the first index value.

In one embodiment of the present application, the correction module 730 is further configured to: determining a presence indication value of the second bit transmission beam based on the port number, the historical report RI value and the historical report value; and determining the second bit transmission beam as the existence indication condition of the candidate transmission beam according to the existence indication value, wherein the existence indication value is a set value, and whether the second bit transmission beam exists in the historical report value is represented.

In one embodiment of the present application, the correction module 730 is further configured to: under the condition that the port number is 4 and the historical report RI value is 2, determining the last bit of the historical report value as a presence indication value; and under the condition that the port number is 8 and the historical report RI value is 2, determining the last two bits of the historical report value as the presence indication value.

In one embodiment of the present application, the correction module 730 is further configured to: acquiring a third index value of a transmission beam; under the condition that the first index value is equal to the third index value, adding 1 to a first count value of the transmission beam corresponding to the third index value, wherein the first count value is used for indicating the number of times that the transmission beam is used as a first transmission beam; and adding 1 to a second count value of the transmission wave corresponding to the third index value when the second index value is equal to the third index value, wherein the second count value is used for indicating the number of times that the transmission wave beam is used as the second bit transmission wave beam.

In one embodiment of the present application, the correction module 730 is further configured to: acquiring a third index value of a transmission beam; and when the first index value is equal to the third index value, adding 1 to the first count value of the transmission beam corresponding to the third index value.

In one embodiment of the present application, the correction module 730 is further configured to: when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining the largest count value in the first count value and the second count value as a target count value; when the indication condition is that only the first transmission beam exists, determining the largest count value in the first count values as a target count value; and determining the transmission beam corresponding to the target count value as a target transmission beam.

In one embodiment of the present application, the correction module 730 is further configured to: determining an offset value based on the number of ports and the historically reported RI value; the historical report value is shifted right by the bit number of the offset value size to determine a first index value.

In one embodiment of the present application, the configuration data includes a first oversampling factor, a first antenna port number, a second oversampling factor, and a second antenna port number, and the correction module 730 is further configured to: determining a second index value based on the number of ports, the historical report value, the offset value, the first oversampling factor, the first antenna port number, the second oversampling factor, and the second antenna port number; the formula for obtaining the second index value includes: in the case where the number of ports is 4 and the historically reported RI value is 2, beam 2 = mode ((repotpnix 1 > p) +o1, O1 x N1); or, in case that the number of ports is 8 and the historically reported RI value is 2,

In one embodiment of the present application, the correction module 730 is further configured to: determining a fourth index value of a current first transmission beam currently selected by the terminal based on the first PMI; determining whether the current first transmission beam is near the target transmission beam based on the index value of the target transmission beam and the fourth index value; under the condition that the current first transmission beam is near the target transmission beam, correcting the first PMI based on the current first transmission beam to obtain a second PMI; and under the condition that the current first transmission beam is not near the target transmission beam, correcting the first PMI based on the target transmission beam to obtain a second PMI.

In one embodiment of the present application, the correction module 730 is further configured to: determining an absolute value of a difference between the index value of the target transmission beam and the fourth index value; and under the condition that the absolute value of the difference value is smaller than the set threshold value, determining that the current first transmission beam is near the target transmission beam.

In one embodiment of the present application, the correction module 730 is further configured to: acquiring a current report value of a target information domain of the first PMI; determining a current reporting offset value based on the number of ports and the current reporting RI value; and right shifting the current reported value by the bit number of the current reported offset value to determine a fourth index value.

In one embodiment of the present application, the second obtaining module 720 is further configured to: and under the condition that the current RI value is not 1, determining that the current RI value is mutated.

In order to implement the foregoing embodiments, the embodiments of the present application further provide an electronic device 800, as shown in fig. 8, where the electronic device 800 includes: the processor 801 and the memory 802 communicatively coupled to the processor, the memory 802 storing instructions executable by the at least one processor, the instructions being executable by the at least one processor 801 to implement a basic input output system BIOS boot method as an embodiment of the first aspect of the present application.

In order to implement the above embodiments, the embodiments of the present application further provide a non-transitory computer readable storage medium storing computer instructions, where the computer instructions are configured to cause a computer to implement a BIOS startup method of a basic input output system as the embodiments of the first aspect of the present application.

In order to implement the above embodiments, the embodiments of the present application further provide a computer program product, including a computer program, which when executed by a processor implements a BIOS startup method of a BIOS as in the embodiments of the first aspect of the present application.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (gl 0bal system of m0bile communication, GSM) system, code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet Radio service (general packet Radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, long term evolution-advanced (long term evolution advanced, LTE-a) system, universal mobile system (universal m0bile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) system, new air interface (New Radio, NR) system, etc. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

The terminal device according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (m 0 station), mobile station (m 0 bit), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for a terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global System for mobile communications (Gl 0bal System for M0bile communications, GSM) or a code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) System, a 5G base station (gNB) in a 5G network architecture (next generation System), a home evolved node (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), or the like, which is not limited in the embodiments of the present application. In some network structures, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may each be made between a network device and a terminal device using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

Claims

1. The Precoding Matrix Indicator (PMI) correction method is characterized by comprising the following steps:

acquiring Channel State Information (CSI) reported by a terminal, wherein the CSI comprises a first PMI;

under the condition that the RI value is mutated, acquiring historical CSI reported by the terminal in a historical manner;

correcting the first PMI based on the historical CSI to obtain a second PMI;

and indicating the second PMI to the terminal.

2. The method of claim 1, wherein the correcting the first PMI based on the historical CSI to obtain a second PMI comprises:

acquiring N transmission beams for transmission with the terminal, wherein N is a positive integer greater than or equal to 2;

Determining a target transmission beam from the N transmission beams based on the historical CSI;

and correcting the first PMI based on the target transmission beam to obtain the second PMI.

3. The method of claim 2, wherein the determining a target transmission beam from the N transmission beams based on the historical CSI comprises:

acquiring target information fields in a plurality of historical PMIs;

determining the number of occurrences of each of said transmission beams in a plurality of said target information fields;

and selecting the transmission beam with the largest occurrence number as the target transmission beam.

4. The method of claim 3, wherein said determining the number of occurrences of each of said transmission beams in a plurality of said target information fields comprises:

acquiring the port number in the historical CSI, the historical report value and the historical report RI value of the target information domain, and acquiring configuration data of an antenna;

and obtaining the occurrence times of each transmission beam in a plurality of target information domains based on the port number, the historical report RI value, the configuration data and the historical report value.

5. The method of claim 4, wherein the historical report value is used to indicate at least one candidate transmission beam for transmission, and the obtaining the occurrence number of each transmission beam based on the port number, the historical report RI value, the configuration data, and the historical report value comprises:

Determining the indication condition of the candidate transmission beam according to the historical report value;

according to the indication condition, determining an index value of the candidate transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value;

and obtaining the occurrence times of each transmission beam serving as the candidate transmission beam based on the index value of the candidate transmission beam.

6. The method of claim 5, wherein the candidate transmission beams comprise a first transmission beam and/or a second transmission beam, the method further comprising:

when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining a first index value of the first transmission beam and a second index value of the second transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value;

and respectively obtaining the occurrence times of each transmission beam serving as the candidate transmission beam based on the first index value and the second index value.

7. The method of claim 6, wherein the method further comprises:

When the indication condition is that only the first transmission beam exists, determining a first index value of the first transmission beam based on the port number, the historical report RI value, the configuration data and the historical report value, and obtaining the occurrence times of each transmission beam serving as the first transmission beam based on the first index value.

8. The method of claim 5, wherein said determining an indication of said candidate transmission beam based on said historical report value comprises:

determining a presence indication value of the second bit transmission beam based on the port number, the historically reported RI value, and the historically reported value;

and determining the presence indication condition of the second bit transmission beam as a candidate transmission beam according to the presence indication value, wherein the presence indication value is a set value and represents whether the second bit transmission beam exists in the historical report value.

9. The method of claim 8, wherein the determining the presence indication value of the second bit transmission beam based on the number of ports, the historically reported RI value, and the historically reported value comprises:

Under the condition that the port number is 4 and the historical report RI value is 2, determining the last bit of the historical report value as the presence indication value; and

and under the condition that the port number is 8 and the historical report RI value is 2, determining the last two bits of the historical report value as the presence indication value.

10. The method of claim 6, wherein the obtaining the number of occurrences of each of the transmission beams as the candidate transmission beam based on the first index value and the second index value, respectively, comprises:

acquiring a third index value of the transmission beam;

adding 1 to a first count value of a transmission beam corresponding to the third index value when the first index value is equal to the third index value, wherein the first count value is used for indicating the number of times that the first transmission beam is used as the candidate transmission beam; and

and if the second index value is equal to the third index value, adding 1 to a second count value of the transmission wave corresponding to the third index value, wherein the second count value is used for indicating the number of times that the second bit transmission wave beam is used as the candidate transmission wave beam.

11. The method of claim 7, wherein the deriving the number of occurrences of each of the transmission beams as the candidate transmission beam based on the first index value comprises:

acquiring a third index value of the transmission beam;

and when the first index value is equal to the third index value, adding 1 to a first count value of the transmission beam corresponding to the third index value.

12. The method according to claim 10 or 11, wherein said selecting the transmission beam with the highest occurrence as the target transmission beam comprises:

when the indication condition is that the first transmission beam and the second transmission beam exist simultaneously, determining the largest count value in the first count value and the second count value as a target count value;

when the indication condition is that only the first transmission beam exists, determining the largest count value in the first count value as the target count value;

and determining the transmission beam corresponding to the target count value as the target transmission beam.

13. The method of claim 6 or 7, wherein determining the first index value comprises:

determining an offset value based on the number of ports and the historically reported RI value;

And right-shifting the historical report value by the bit number of the offset value to determine the first index value.

14. The method of claim 13, wherein the configuration data includes a first oversampling factor, a first antenna port number, a second oversampling factor, and a second antenna port number, and wherein determining the second index value comprises:

determining the second index value based on the number of ports, the historical report value, the offset value, the first oversampling factor, the first antenna port number, the second oversampling factor, and the second antenna port number;

the formula for obtaining the second index value includes:

in the case where the number of ports is 4 and the history report RI value is 2,

beam 2＝mode((ReportPmiX1>>p)+O ₁ ,O ₁ *N ₁ ) The method comprises the steps of carrying out a first treatment on the surface of the Or,

in the case where the number of ports is 8 and the history report RI value is 2,

wherein ReportPmiX1 is the historical report value, p is the offset value in the case of 4 ports, q is the offset value in the case of 8 ports, beam2 is the second index value, and O ₁ For the first oversampling factor, the N ₁ For the first number of antenna ports, the O ₂ For the second oversampling factor, the N ₂ And the number of the second antenna ports.

15. The method according to any one of claims 2-11, wherein said correcting the first PMI based on the target transmission beam to obtain the second PMI comprises:

determining a fourth index value of a current first transmission beam currently selected by the terminal based on the first PMI;

determining whether the current leading transmission beam is in the vicinity of the target transmission beam based on the index value of the target transmission beam and the fourth index value;

and under the condition that the current first transmission beam is near the target transmission beam, correcting the first PMI based on the current first transmission beam to obtain the second PMI, wherein the specific calculation method comprises the following steps: using the current first transmission beam as a second PMI;

and under the condition that the current first transmission beam is not near the target transmission beam, correcting the first PMI based on the target transmission beam to obtain a second PMI, wherein the specific calculation method comprises the following steps: the target transmission beam is used as a second PMI.

16. The method of claim 15, wherein the determining whether the current leading transmission beam is in the vicinity of the target transmission beam based on the index value of the target transmission beam and the fourth index value comprises:

Determining an absolute value of a difference between the index value of the target transmission beam and the fourth index value;

and under the condition that the absolute value of the difference value is smaller than a set threshold value, determining that the current first transmission beam is near the target transmission beam.

17. The method of claim 15, wherein the determining, based on the first PMI, a fourth index value of a current first transmission beam currently selected by the terminal includes:

acquiring a current report value of a target information domain of the first PMI;

determining a current reporting offset value based on the number of ports and the current reporting RI value;

and right shifting the current report value by the bit number of the current report offset value to determine the fourth index value.

18. The method of claim 1, wherein determining that the current RI value is mutated comprises:

and under the condition that the current RI value is not 1, determining that the current RI value is mutated.

19. A precoding matrix indicator PMI correction apparatus, comprising:

the first acquisition module is used for acquiring Channel State Information (CSI) reported by the terminal, wherein the CSI comprises a first PMI;

the second acquisition module is used for acquiring historical CSI reported by the terminal history under the condition that the RI value is suddenly changed;

The correction module is used for correcting the first PMI based on the historical CSI to obtain a second PMI;

and the indication module is used for indicating the second PMI to the terminal.

20. The apparatus of claim 19, wherein the correction module is further configured to:

21. The apparatus of claim 20, wherein the correction module is further configured to:

acquiring target information fields in a plurality of historical PMIs;

22. The apparatus of claim 21, wherein the correction module is further configured to:

23. The apparatus of claim 22, wherein the historical report value is used to indicate at least one candidate transmission beam for transmission, and wherein the correction module is further configured to:

24. The apparatus of claim 23, wherein the candidate transmission beams comprise a first transmission beam and/or a second transmission beam, and wherein the correction module is further configured to:

25. The apparatus of claim 24, wherein the correction module is further configured to:

26. The apparatus of claim 23, wherein the correction module is further configured to:

and determining the indication condition of the candidate transmission beam according to the presence indication value, wherein the presence indication value is a set value, and the second bit transmission beam is not indicated in the historical report value.

27. The apparatus of claim 26, wherein the correction module is further configured to:

28. The apparatus of claim 24, wherein the correction module is further configured to:

acquiring a third index value of the transmission beam;

adding 1 to a first count value of a transmission beam corresponding to the third index value when the first index value is equal to the third index value, wherein the first count value is used for indicating the number of times that the transmission beam is used as the first transmission beam; and

and when the second index value is equal to the third index value, adding 1 to a second count value of the transmission wave corresponding to the third index value, wherein the second count value is used for indicating the number of times that the transmission wave beam is used as the second bit transmission wave beam.

29. The apparatus of claim 25, wherein the correction module is further configured to:

acquiring a third index value of the transmission beam;

30. The apparatus of claim 28 or 29, wherein the correction module is further configured to:

31. The apparatus of claim 24 or 25, wherein the correction module is further configured to:

32. The apparatus of claim 31, wherein the configuration data comprises a first oversampling factor, a first antenna port number, a second oversampling factor, and a second antenna port number, the correction module further configured to:

the formula for obtaining the second index value includes:

33. The apparatus of claims 20-29, wherein the correction module is further configured to:

when the current first transmission beam is not near the target transmission beam, correcting the first PMI based on the target transmission beam to obtain a second PMI, wherein the specific calculation method is as follows: the target transmission beam is used as a second PMI.

34. The apparatus of claim 33, wherein the correction module is further configured to:

35. The apparatus of claim 33, wherein the correction module is further configured to:

36. The apparatus of claim 19, wherein the second acquisition module is further configured to:

37. An electronic device, comprising a memory and a processor;

wherein the processor runs a program corresponding to executable program code stored in the memory by reading the executable program code for implementing the method according to any one of claims 1-18.

38. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1-18.

39. A computer program product comprising a computer program which, when executed by a processor, implements the method according to any of claims 1-18.