WO2025107667A1 - Data transmission method and apparatus, data receiving method and apparatus, and storage medium - Google Patents

Abstract

The embodiments of the present disclosure relate to the technical field of communications. Provided are a data transmission method and apparatus, a data receiving method and apparatus, and a storage medium. The data transmission method comprises: receiving first signaling, which is used for indicating the number of precoding matrices, and determining M precoding matrices from a first codeword set, wherein M is a positive integer; and transmitting data to a second node on the basis of the M pre-coding matrices.

Description

Data transmission method, data receiving method, device and storage medium

Cross-references

The present invention claims the priority of the Chinese patent application filed with the Chinese Patent Office on November 22, 2023, with application number 202311580900.3 and invention name “Data transmission method, data receiving method, device and storage medium”. The entire contents of the application are incorporated into the present invention by reference.

Technical Field

The present disclosure relates to the field of communication technology, and in particular to a data transmission method, a data receiving method, a device and a storage medium.

Background Art

In wireless communication technology, in order to improve the efficiency of data transmission, a precoding matrix is proposed. The efficiency of data transmission can be improved by applying the precoding matrix to the transmitting antenna for data transmission. The scheme of applying the precoding matrix to the transmitting antenna for data transmission is that the terminal transmits an uplink reference signal, the base station measures the uplink reference signal, and determines the precoding matrix applied to the transmitting antenna of the terminal. The base station then indicates to the terminal the precoding matrix to be used, and the terminal transmits data based on the precoding matrix indicated by the base station. Because of the time-varying nature of the channel, the base station needs to send control signaling to the terminal to indicate the precoding matrix that the terminal should use in real time, so as to adapt to the changes of the channel in the frequency domain over time, so that the precoding matrix used by the terminal can match the channel state, so as to improve the efficiency of data transmission. However, the signaling overhead of the base station indicating the precoding matrix that the terminal should use is relatively large.

Summary of the invention

The embodiments of the present disclosure provide a data transmission method, a data receiving method, an apparatus, and a storage medium, which are used to reduce the signaling overhead of indicating a precoding matrix that a terminal should use.

In order to achieve the above objectives, the present disclosure adopts the following technical solutions:

In a first aspect, a data transmission method is provided, the method being applied to a first node, the method comprising: The method comprises: receiving a first signaling, the first signaling being used to indicate the number M of precoding matrices, and determining M precoding matrices from a first codeword set, where M is a positive integer;

Data is transmitted to the second node based on the M precoding matrices.

In a second aspect, a data receiving method is provided, which is applied to a second node, and the method includes: sending a first signaling, where the first signaling is used to indicate the number M of precoding matrices, and determining M precoding matrices from a first codeword set, where M is a positive integer; and receiving data, which is transmitted by the M precoding matrices of the first node.

In a third aspect, a communication device is provided, which is applied to a first node, and includes: a receiving unit, configured to receive a first signaling, the first signaling being configured to indicate the number M of precoding matrices, and to determine M precoding matrices from a first codeword set, where M is a positive integer;

A sending unit is used to transmit data to the second node based on M precoding matrices.

In a fourth aspect, a communication device is provided, which is applied to a second node, and includes: a sending unit, used to send a first signaling, the first signaling is used to indicate the number M of precoding matrices, and to determine M precoding matrices from a first codeword set, M is a positive integer; a receiving unit, used to receive data, which is transmitted by the first node based on the M precoding matrices.

In a fifth aspect, a communication device is provided, comprising: a processor and a memory; the memory stores instructions executable by the processor; when the processor is configured to execute the instructions, the communication device implements any method provided in the first aspect or the second aspect above.

In a sixth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer executes any one of the methods provided in the first aspect or the second aspect.

In a seventh aspect, a computer program product comprising computer instructions is provided. When the computer instructions are executed on a computer, the computer executes any one of the methods provided in the first aspect or the second aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

FIG1 is a schematic diagram of the structure of a communication system provided by an embodiment of the present disclosure;

FIG2 is a schematic diagram of a flow chart of a data transmission method provided by an embodiment of the present disclosure;

FIG3 is a schematic diagram of a flow chart of a data receiving method provided in an embodiment of the present disclosure;

FIG4 is a schematic diagram of the composition of a communication device provided by an embodiment of the present disclosure;

FIG5 is a schematic diagram of the composition of another communication device provided in an embodiment of the present disclosure;

FIG6 is a schematic diagram of the structure of a communication device provided in an embodiment of the present disclosure.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "first" or "second" may explicitly or implicitly indicate the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

In the embodiments of the present disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present disclosure should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values may, in practice, be based on additional conditions or values beyond those stated.

At present, the scheme for the precoding matrix to act on the transmitting antenna of the terminal to transmit uplink data is that the terminal transmits an uplink reference signal, the base station measures the uplink reference signal, and determines the precoding matrix applied to the transmitting antenna of the terminal; then, the base station indicates the precoding matrix to the terminal, and the terminal transmits data based on the precoding matrix indicated by the base station. Because of the time-varying nature of the channel, the base station needs to send control signaling to the terminal in real time to indicate the precoding matrix that the terminal should use in real time, so as to adapt to the channel with changes in the frequency domain, so that the precoding matrix can match the channel state in real time. For example, the base station can send downlink control information format (DCI F) signaling to the terminal in real time to indicate the precoding matrix that the terminal should use in real time.

However, the load of a single control signaling is limited, that is, the number of bits used to carry precoding matrix information on a single control signaling is limited, and it can only indicate a few precoding matrices for the terminal to perform uplink data transmission; and these few precoding matrices cannot match the channel state that has changes in the frequency domain of the transmitted data, thereby reducing the efficiency of data transmission. For example, taking the control signaling as DCI F signaling, 6 bits are currently used in DCI F signaling to indicate the number of layers of data transmission in a joint coding manner, and a precoding matrix corresponding to each layer. This precoding matrix is applied to the entire frequency band of the terminal to transmit data. However, the channel has frequency domain selectivity in the frequency band of transmitted data, that is, the channel is not consistent in the frequency band of transmitted data, but changes with frequency. One precoding matrix cannot be suitable for all channels. The frequency band used to transmit data is allocated to different parts of the frequency, thereby reducing the efficiency of data transmission.

The joint use of multiple DCI F signaling can increase the load of DCI F signaling and increase the number of bits used by DCI F signaling to carry precoding matrix information, so that the precoding matrix used by the terminal can match the channel state with changes in the frequency domain, so as to improve the efficiency of data transmission. However, the use of multiple DCI F signaling will increase the resource overhead of the control area used for DCI F signaling. Among them, the control area used for DCI F signaling is the time-frequency resource area that carries DCI F signaling. When the size of the control area is constant, the number of DCI F signaling for a single user is increased. On the one hand, the number of other users scheduled using the control area will be reduced, and the capacity supported by the communication system for users will be reduced; on the other hand, the number of user retrieval control signaling will be increased, thereby increasing the complexity of the communication system. How to use the limited load of control signaling, or the limited number of bits, to indicate the precoding matrix used for terminal data transmission to adapt to the changing channel state on the frequency band of the transmitted data, so as to improve the efficiency of data transmission, is an urgent problem to be solved in current wireless communication technology, including the future sixth-generation mobile communications technology (6G). That is, how to reduce the signaling overhead for indicating the precoding matrix that the terminal should use is an issue that needs to be solved urgently.

Based on this, an embodiment of the present disclosure provides a data transmission method, wherein a first node receives a first signaling, the first signaling is used to indicate the number of precoding matrices, and to determine M precoding matrices from a first codeword set, that is, one signaling is used to indicate the number of precoding matrices, and to determine M precoding matrices from the first codeword set, so that the first node can determine M precoding matrices that match a channel state that changes in the frequency domain based on the first signaling, and then transmit data based on the M precoding matrices, which can improve the efficiency of data transmission. In this way, by using a control signaling of a certain size to indicate a precoding matrix that can match a channel state that changes in the frequency domain, the efficiency of data transmission is improved while reducing the signaling overhead of indicating the precoding matrix that the first node should use.

It should be noted that the long term evolution (LTE) technology in wireless communication technology and the new radio (NR) technology in wireless communication technology are based on orthogonal frequency division multiplexing (OFDM) technology; in OFDM In the technology, the smallest unit in the frequency domain is the subcarrier, and the smallest unit in the time domain is the OFDM symbol. In order to facilitate the use of frequency domain resources, resource blocks (RBs) are defined, and a resource block is defined as a specific number of consecutive subcarriers. Partial bandwidth (BWP) is also defined, and a partial bandwidth is defined as another specific number of consecutive resource blocks on a carrier. In order to facilitate the use of time domain resources, time slots are defined, and a time slot is defined as another specific number of consecutive OFDM symbols.

In order to improve the efficiency of data transmission, the base station sends a reference signal; the terminal measures the reference signal, determines the channel state information from the base station to the terminal, and reports the channel state information to the base station; the base station receives the channel state information reported by the terminal. The base station determines the data transmission strategy based on the channel state represented by the received channel state information, and transmits data, thereby improving the efficiency of data transmission. The accuracy of the channel state represented by the channel state information affects the transmission strategy of the base station, thereby affecting the efficiency of data transmission.

The reference signal sent by the base station to the terminal is the downlink reference signal; in the LTE system, the downlink reference signal used for channel state information reporting includes the cell-specific reference signal (CRS) and the channel state information reference signal (CSI-RS); in the NR system, the downlink reference signal used for channel state information reporting includes the channel state information reference signal (CSI-RS). The channel state information reference signal (CSI-RS) is carried by the channel state information reference signal resource (CSI-RS Resource), and the channel state information reference signal resource is composed of CDM groups. A CDM group is composed of radio resource elements, and the CSI-RS of a group of CSI-RS ports are multiplexed on it by code division multiplexing.

The content of the channel state information transmitted between the base station and the terminal includes a channel quality indicator (CQI) to indicate the quality of the channel; or includes a precoding matrix indicator (PMI) to indicate the precoding matrix applied to the base station antenna. One type of CQI reporting format is wideband CQI reporting, which reports a channel quality for the channel state information reporting band (CSI reporting band), and the channel quality corresponds to the entire channel state information reporting band; another type of CQI reporting format is subband CQI reporting. (subband CQI reporting), that is, the channel quality of the channel state information reporting band (CSI reporting band) is given in units of subbands, where one channel quality corresponds to one subband, that is, a channel quality is reported for each subband of the channel state information reporting band. The subband is a frequency domain unit, defined as N consecutive resource blocks (RB, Resource Block), N is a positive integer; for the sake of ease of description, this application refers to the channel quality indication subband, or CQI subband, or subband; wherein N is called the size of the CQI subband, or the CQI subband size, or the subband size. The partial bandwidth (BWP, Bandwidth part) is divided into subbands, and the channel state information reporting band (CSI reporting band) is defined by a subset of the subbands of the partial bandwidth (BWP, Bandwidth part). The channel state information reporting band (CSI reporting band) is the band on which the channel state information needs to be reported.

One way to determine the channel quality is to determine it based on the strength of the reference signal received by the terminal; another way to determine the channel quality is to determine it based on the signal to interference noise ratio of the received reference signal. In the channel state information reporting band, if the channel quality does not change much, reporting CQI in a wideband CQI reporting manner can reduce the resource overhead for CQI reporting; if the channel quality varies greatly in the frequency domain, reporting CQI in a sub-band CQI reporting manner can increase the accuracy of the CQI report.

The reporting format of one type of PMI is a wideband PMI report, that is, reporting a PMI for a channel state information reporting band (CSI reporting band), and the PMI corresponds to the entire channel state information reporting band. The reporting format of another type of PMI is a subband PMI report, that is, reporting a PMI for each subband of the channel state information reporting band, or reporting a component of a PMI for each subband of the channel state information reporting band. For example, the PMI is composed of X1 and X2. One way to report a component of a PMI for each subband of the channel state information reporting band is to report an X1 for the entire band and an X2 for each subband; another way is to report an X1 and an X2 for each subband.

Another type of PMI reporting format is that the reported PMI indicates R precoding matrices for each subband, where R is a positive integer. In terms of the frequency domain granularity of the feedback precoding matrix, R also represents the number of precoding matrix subbands included in each subband, or the number of precoding matrix subbands included in each CQI subband. The number of subbands in the code matrix.

The following describes the solutions of the embodiments of the present disclosure in conjunction with the accompanying drawings.

The technical solution provided by the embodiments of the present disclosure can be applied to various mobile communication networks, for example, NR mobile communication networks using 5G, future mobile communication networks (such as 6G wireless communication systems) or multiple communication convergence systems, etc., and the embodiments of the present disclosure are not limited to this.

FIG1 is a schematic diagram of a communication system provided by an embodiment of the present disclosure. As shown in FIG1 , the communication system includes but is not limited to a first node 110 and a second node 120. The first node 110 and the second node 120 can send, receive and interact with each other via wireless signals.

In a wireless communication scenario, the first node 110 communicates with the second node 120 through a wireless channel. For example, the first node 110 is a base station, the second node 120 is a terminal, and the base station and the terminal communicate through a wireless channel. For another example, the first node 110 is a terminal, the second node 120 is a wireless router, and the wireless router communicates with the terminal through a wireless channel. For another example, the first node 110 is a first base station, the second node 120 is a second base station, and the first base station and the second base station communicate through a wireless channel. For another example, the first node 110 is a first terminal, the second node 120 is a second terminal, and the first terminal and the second terminal communicate through a wireless channel. For another example, the first node 110 is a repeater, the second node 120 is a base station, and the base station and the repeater communicate through a wireless channel. For another example, the first node 110 is a terminal, the second node 120 is a repeater, and the repeater and the terminal communicate through a wireless channel. For another example, the first node 110 is a first repeater, the second node 120 is a second repeater, and the first repeater communicates with the second repeater through a wireless channel. For another example, the first node 110 is a base station, the second node 120 is a satellite, and the satellite and the base station communicate through a wireless channel. For another example, the first node 110 is a satellite, the second node 120 is a base station, and the base station and the satellite communicate through a wireless channel. For another example, the first node 110 is a terminal, the second node 120 is a satellite, and the satellite and the terminal communicate through a wireless channel. For another example, the first node 110 is a satellite, the second node 120 is a terminal, and the terminal communicates with the satellite through a wireless channel. For another example, the first node 110 is a ground device, the second node 120 is an aircraft, and the aircraft and the ground device communicate through a wireless channel. For another example, the first node 110 is a first aircraft, the second node 120 is a second aircraft, and the first aircraft and the second aircraft communicate through a wireless channel. The two aircraft communicate through a wireless channel.

The “first” node, “second” node, “first” way, “second” way, “first” method, “second” method, “first” matrix, “second” matrix, “first” part, “second” part in the present disclosure, unless otherwise specified, are only used for descriptive distinction and do not represent the order of precedence or sequence.

In some embodiments, the first node and the second node may also have other names. For example, the first node may also be called a first communication node, and the second node may also be called a second communication node, etc. The embodiments of the present disclosure are not limited to this.

In some embodiments, the base station may be any of an evolution node B (eNB), a next generation node B (gNB), a transmission receive point (TRP), a transmission point (TP), and some other access nodes. According to the size of the service coverage area provided, the base station can be divided into a macro base station for providing macro cells (Macro cells), a micro base station for providing micro cells (Pico cells), and a femto base station for providing femto cells (Femto cells). With the continuous evolution of wireless communication technology, future base stations may also adopt other names.

The terminal may be a device with wireless transceiver function, such as a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR)/virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), etc. The disclosed embodiments do not limit the specific types of the terminal.

It should be understood that FIG1 is an exemplary structural diagram, and the number of devices included in the communication system shown in FIG1 is not limited, for example, the number of first nodes and second nodes is not limited. In addition, in addition to the devices shown in FIG1, the communication system shown in FIG1 may also include other devices, which is not limited.

Next, as shown in FIG. 2 , an embodiment of the present disclosure provides a data transmission method, which is applied to a first node, and the first node may be the first node 110 shown in FIG. 1 , and the method includes the following steps:

S101. Receive a first signaling.

In some embodiments, in order to improve the efficiency of data transmission of the first node, the second node sends a first signaling to the first node to indicate the precoding matrix to be applied by the first node to transmit data. Accordingly, the first node receives the first signaling. The second node may be the second node 120 shown in FIG. 1 above. For example, the following takes the first node as a terminal and the second communication node as a base station as an example to illustrate a data transmission method and a data reception method provided in an embodiment of the present disclosure. The first signaling may be a DCI F signaling.

In some embodiments, the first signaling is used to indicate the number M of precoding matrices, and to determine M precoding matrices from the first codeword set, where M is a positive integer.

It should be understood that since the wireless channel is a channel that changes over time, the second node needs to indicate to the first node in real time by means of signaling the information of the precoding matrix that the first node should use, so that the precoding matrix used by the first node adapts to the channel state that changes in the frequency domain. In other words, the first node needs to receive signaling from the second node to receive the information of the precoding matrix carried by the signaling in real time, so that the precoding matrix used by the first node to transmit data can adapt to the channel state that changes in the frequency domain. The channel state on the frequency band in which the first node transmits data is frequency selective, that is, the channel state at different frequencies is different. If the first node uses a single precoding matrix on the entire frequency band for transmitting data, it cannot meet the channel state of the entire frequency band for transmitting data. In other words, using a single precoding matrix on the entire frequency band for transmitting data will reduce the efficiency of data transmission.

Using different precoding matrices at different frequencies on the frequency band of transmitted data, that is, using corresponding precoding matrices that match them at different frequencies, can improve the efficiency of data transmission. However, signaling is real-time, so the signaling load is limited, that is, the number of bits carrying the information of the precoding matrix in the signaling is limited or fixed; the impact of the bit overhead of the average indication of each precoding matrix on the performance of using the precoding matrix to transmit data is related to the change of the channel state in the frequency band of the transmitted data; therefore, it is necessary to balance the number of precoding matrices used in the frequency band of transmitted data and the average bit overhead of each precoding matrix, that is, it is necessary to balance the number of precoding matrices indicated by the first signaling and the average bit overhead of each precoding matrix, so that under the condition that the number of bits carrying the information of the precoding matrix is limited, the precoding matrix indicated by the first signaling is adapted to the transmission. The channel status within the frequency band of transmitted data can be monitored to improve the efficiency of data transmission.

For example, when the frequency band of data transmission increases, the efficiency of data transmission can be improved by increasing the number of precoding matrices, and correspondingly, reducing the number of precoding matrices will reduce the efficiency of data transmission. For another example, when the channel state changes in a large range or changes quickly within the frequency band of data transmission, the efficiency of data transmission can be improved by increasing the bit overhead indicating each precoding matrix on average, and correspondingly, reducing the bit overhead indicating each precoding matrix on average will reduce the efficiency of data transmission.

Therefore, the first signaling is used to indicate the number of precoding matrices and to determine M precoding matrices from the first codeword set, that is, one signaling is used to indicate the number of precoding matrices and to determine M precoding matrices from the first codeword set. This allows the M precoding matrices determined by the first node based on the first signaling to match the channel state that changes in the frequency domain, so as to improve the efficiency of data transmission, and realizes the use of a certain size of control signaling to indicate the precoding matrix that can match the channel state that changes in the frequency domain, thereby reducing the signaling overhead of indicating the precoding matrix that the first node should use.

In some embodiments, the first signaling includes a first field, and the first field is used to indicate that M precoding matrices are determined from a first codeword set. The elements in the first codeword set are codewords, and the codewords may be matrices; determining the M precoding matrices from the first codeword set means indicating M codewords or matrices from the first codeword set as the M precoding matrices. The first field of the first signaling may be a bit string, that is, the first field may be composed of multiple bits.

In some embodiments, the M precoding matrices include at least a first precoding matrix and a second precoding matrix, and the first field is used to indicate that the M precoding matrices are determined from a first codeword set, which can be specifically implemented as: indicating the index number of the first precoding matrix in the first codeword set, and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set.

The relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set may refer to the index number of the second precoding matrix in the first codeword set. The difference between the index number in the codeword set and the index number of the first precoding matrix in the first codeword set. The first precoding matrix is one of the M precoding matrices, and the second precoding matrix is a precoding matrix among the M precoding matrices except the first precoding matrix.

By indicating the index number of the first precoding matrix in the first codeword set, and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set, the first node can determine the first precoding matrix based on the index number of the first precoding matrix in the first codeword set, and determine the index number of the second precoding matrix in the first codeword set based on the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set and the index number of the first precoding matrix in the first codeword set, and then determine the second precoding matrix based on the index number of the second precoding matrix in the first codeword set.

In this way, it is only necessary to indicate the index number of the first precoding matrix in the first codeword set and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set, without directly indicating the index number of the second precoding matrix in the first codeword set, to determine the second precoding matrix, that is, by indicating the index number of one precoding matrix among M precoding matrices in the first codeword set and the relative values of the index numbers of other precoding matrices among the M precoding matrices in the first codeword set relative to the index number of the one precoding matrix in the first codeword set, the signaling overhead of indicating the precoding matrix to be used by the first node can be reduced.

Exemplarily, assuming that the index number of the first precoding matrix in the first codeword set is 1000, and the index number of the second precoding matrix in the first codeword set is 1001, the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set is 1. If the bit overhead required to directly indicate the index number 1001 of the second precoding matrix in the first codeword set is relatively large, and the bit overhead required by indicating the relative value 1 of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set is relatively small. Therefore, by indicating the index number of the second precoding matrix in the first codeword set The relative value of the index number of the first precoding matrix in the first codeword set can reduce the signaling overhead for indicating the precoding matrix that the first node should use.

Furthermore, in an embodiment of the present disclosure, by indicating the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set, rather than indicating the absolute value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set, the signaling overhead of indicating the precoding matrix to be used by the first node can be reduced. The reason is as follows: It should be understood that the channel states at different frequencies in the frequency band of transmitted data are correlated, so that the value range of the relative value of the index number of the precoding matrix will be smaller than the value range of the absolute value of the index number of the precoding matrix, so that the bit overhead of indicating the relative value of the index number is smaller than the bit overhead of indicating the absolute value of the index number. The first domain indicates that the second precoding matrix uses the relative value of the index number indicating the second precoding matrix, which allows the first domain to indicate more precoding matrices, thereby realizing the use of a certain size of control signaling to indicate a precoding matrix that can match the channel state that changes in the frequency domain, thereby reducing the signaling overhead of indicating the precoding matrix to be used by the first node.

In some embodiments, the number of precoding matrices is used to determine a correspondence between each precoding matrix in the M precoding matrices and a frequency domain unit within a frequency band of transmitted data.

Exemplarily, an example of the correspondence between each precoding matrix in the M precoding matrices and the frequency domain unit within the frequency band of the transmission data is that the 0th frequency domain unit within the frequency band of the transmission data corresponds to the 0th precoding matrix; the 1st frequency domain unit within the frequency band of the transmission data corresponds to the 1st precoding matrix; ...

Exemplarily, another example of the correspondence between each of the M precoding matrices and the frequency domain units within the frequency band of the transmission data is that the 0th frequency domain unit to the 1st frequency domain unit within the frequency band of the transmission data corresponds to the 0th precoding matrix; the 2nd frequency domain unit to the 3rd frequency domain unit within the frequency band of the transmission data corresponds to the 1st precoding matrix;…

Exemplarily, another example of the correspondence between each of the M precoding matrices and the frequency domain units within the frequency band of the transmission data is that the 0th frequency domain unit to the 2nd frequency domain unit within the frequency band of the transmission data correspond to the 0th precoding matrix; the 3rd frequency domain unit to the 5th frequency domain unit within the frequency band of the transmission data correspond to the 1st precoding matrix;…

Exemplarily, another example of the correspondence between each precoding matrix in the M precoding matrices and the frequency domain units within the frequency band of the transmission data is that the 0th frequency domain unit to the k-1th frequency domain unit in the frequency band of the transmission data correspond to the 0th precoding matrix; the kth frequency domain unit to the 2k-1th frequency domain unit correspond to the 1st precoding matrix; ...; where k is an integer greater than 0.

Exemplarily, another example of the correspondence between each precoding matrix in the M precoding matrices and the frequency domain unit within the frequency band of the transmission data is that the 0th frequency domain unit to the k-1th frequency domain unit within the frequency band of the transmission data correspond to the 0th precoding matrix; the kth frequency domain unit to the 2k-1th frequency domain unit correspond to the 1st precoding matrix; the 2kth frequency domain unit within the frequency band of the transmission data corresponds to the 2nd precoding matrix; the 2k+1th frequency domain unit within the frequency band of the transmission data corresponds to the 3rd precoding matrix; ...; wherein k is an integer greater than 0.

Exemplarily, taking the number of frequency domain units in the frequency band of the transmitted data as Q, the number k of frequency domain units corresponding to a precoding matrix is a function of Q/M, or a function of Q and M. Each k frequency domain units corresponds to a precoding matrix, and another example of the correspondence between each precoding matrix in the M precoding matrices and the frequency domain units in the frequency band of the transmitted data is that the 0th frequency domain unit to the k-1th frequency domain unit in the frequency band of the transmitted data corresponds to the 0th precoding matrix; the kth frequency domain unit to the 2k-1th frequency domain unit corresponds to the 1st precoding matrix; ...; wherein k is an integer greater than 0.

Exemplarily, taking the number of frequency domain units in the frequency band of the transmission data as Q, the number k of frequency domain units corresponding to a precoding matrix is a function of Q, or a function of Q and M. Another example of the correspondence between each precoding matrix in the M precoding matrices and the frequency domain units in the frequency band of the transmission data is that the 0th frequency domain unit to the k-1th frequency domain unit in the frequency band of the transmission data corresponds to the 0th precoding matrix; the kth frequency domain unit to the 2k-1th frequency domain unit corresponds to the 1st precoding matrix; the 2kth frequency domain unit in the frequency band of the transmission data corresponds to the 2nd precoding matrix; the 2k+1th frequency domain unit in the frequency band of the transmission data corresponds to the 3rd precoding matrix; ...; wherein k is an integer greater than 0.

In some embodiments, each of the M precoding matrices corresponds to a frequency domain unit in the frequency band of the transmission data. That is, the number of frequency domain units in the frequency band of the transmission data can be determined according to the number of precoding matrices, in a manner that one precoding matrix corresponds to one frequency domain unit. The number of precoding matrices is M, which means that the frequency band for transmitting data includes M frequency domain units.

In some embodiments, the first domain is used to indicate that M precoding matrices are determined from the first codeword set, which can be specifically implemented as follows: determining the precoding matrix corresponding to each frequency domain unit in the frequency band of the transmission data from the first codeword set. That is, for each frequency domain unit in the frequency band of the transmission data, the first domain is used to determine a precoding matrix from the first codeword set and indicate the frequency domain unit to which the precoding matrix is applied, wherein each frequency domain unit in the frequency band of the transmission data is applied with a precoding matrix.

In some embodiments, the first domain is used to indicate that M precoding matrices are determined from a first codeword set, which can be specifically implemented as: indicating M different codewords from the first codeword set, and indicating that a codeword is applied as a frequency domain unit of the precoding matrix, that is, indicating the frequency domain unit corresponding to each codeword in the M different codewords.

Exemplarily, taking the case where the first domain includes multiple parts, each part being a bit string, for example, the first bit string of the first domain indicates the first codeword, and indicates that this codeword is used as the frequency domain unit of the precoding matrix; the second bit string of the first domain indicates the second codeword, and indicates that this codeword is used as the frequency domain unit of the precoding matrix; ...; the Mth bit string of the first domain indicates the Mth codeword, and indicates that this codeword is used as the frequency domain unit of the precoding matrix. Alternatively, the first bit string of the first domain indicates the first codeword, and indicates that this codeword is used as the frequency domain unit of the precoding matrix; the second bit string of the first domain indicates the second codeword, and indicates that this codeword is used as the frequency domain unit of the precoding matrix; ...; the Mth bit string of the first domain indicates the Mth codeword, and other frequency domain units in the frequency band of the transmitted data use this codeword as the precoding matrix.

For another example, the first bit string of the first domain indicates M codewords in a bit mapping manner, where one bit in the bit mapping corresponds to one codeword in the first codeword set; the second bit string of the first domain indicates that the first codeword in the M codewords is used as the frequency domain unit of the precoding matrix; the third bit string of the first domain indicates that the second codeword in the M codewords is used as the frequency domain unit of the precoding matrix...; the M+1th bit string of the first domain indicates that the Mth codeword in the M codewords is used as the frequency domain unit of the precoding matrix. Alternatively, the first bit string of the first domain indicates M codewords in a bit mapping manner, where one bit in the bit mapping corresponds to one codeword in the first codeword set. The first bit string corresponds to a codeword in the first codeword set; the second bit string of the first domain indicates that the first codeword among the M codewords is used as the frequency domain unit of the precoding matrix; the third bit string of the first domain indicates that the second codeword among the M codewords is used as the frequency domain unit of the precoding matrix, ...; the Mth bit string of the first domain indicates that the M-1th codeword among the M codewords is used as the frequency domain unit of the precoding matrix, wherein other frequency domain units within the frequency band of transmitted data use the Mth codeword among the M codewords as the precoding matrix.

It should be understood that there are multiple frequency domain units using one codeword as a precoding matrix. By indicating a codeword and the frequency domain unit corresponding to the codeword, that is, indicating that the codeword is used as the frequency domain unit of the precoding matrix, the signaling overhead of repeatedly indicating the same codeword for different frequency domain units is avoided, thereby improving the efficiency of the signaling, and realizing the indication of precoding matrices for more frequency domain units or indicating more precoding matrices through one control signaling, thereby improving the efficiency of data transmission while reducing the signaling overhead of indicating the precoding matrix to be used by the first node.

In some embodiments, the granularity of the frequency domain unit in the frequency band for transmitting data is determined according to the number of precoding matrices. For example, the number of precoding matrices is M, the frequency band for transmitting data includes T resource blocks, and the size of the frequency domain unit contained in the frequency band for transmitting data can be an integer of the quotient of T divided by M, wherein the integer of the quotient is an integer rounded up, or an integer rounded down, or an integer rounded to the nearest integer, or an integer rounded in other ways, and the embodiments of the present disclosure do not limit this. Based on this, the first node can determine the granularity of the frequency domain unit in the frequency band for transmitting data based on the number of precoding matrices, without the need for the second node to indicate the granularity of the frequency domain unit in the frequency band for transmitting data in other signaling ways, which can reduce the signaling overhead of indicating the precoding matrix that the first node should use.

In some embodiments, the first domain may also indicate other information at the same time. For example, the first domain may also be used to indicate the number of precoding matrices; for another example, the first domain may also be used to indicate the number of bits occupied by each precoding matrix; for another example, the first domain may also be used to indicate the number of layers of data transmitted in a spatial division multiplexing method of transmitting data through a precoding matrix.

In some embodiments, the first signaling is used to indicate the number M of precoding matrices, which may be indicated in an explicit manner or in an implicit manner.

Taking the first signaling indicating the number M of precoding matrices in a display manner as an example, for example, The number of precoding matrices indicated may be displayed through another field different from the first field in the first signaling; the number of precoding matrices indicated may also be displayed through the first field of the first signaling, that is, the first field of the first signaling is used to indicate that M precoding matrices are determined from the first codeword set, and the first field of the first signaling is also used to indicate the number of precoding matrices, that is, the number of precoding matrices indicated is displayed using the same field as that for indicating the M precoding matrices.

Taking the example that the first signaling indicates the number M of precoding matrices in an implicit manner, the first signaling can be used to indicate other information to implicitly indicate the number M of precoding matrices.

For example, the first signaling is also used to indicate a method of the precoding matrix, and the first node can determine the number of precoding matrices according to the method of the precoding matrix indicated by the first signaling. It should be understood that there are multiple candidate methods for indicating the precoding matrix, and the number of precoding matrices indicated by different candidate methods is different. The first signaling indicates the method for indicating the precoding matrix, thereby indicating the number of precoding matrices indicated.

For another example, the first signaling is also used to indicate the bit overhead of each precoding matrix, and the first node can determine the number of precoding matrices based on the bit overhead of each precoding matrix. It should be understood that the number of bits used to indicate the precoding matrix in the first signaling is fixed or known in advance, and the number of precoding matrices indicated by the first signaling can be the quotient of the number of bits used to indicate the precoding matrix in the first signaling divided by the bit overhead of each precoding matrix; or, the number of precoding matrices indicated by the first signaling can also be a function of the number of bits used to indicate the precoding matrix in the first signaling and the bit overhead of each precoding matrix.

For another example, the first signaling is also used to indicate the first codeword set used, and the first node can determine the number of indicated precoding matrices according to the first codeword set. It should be understood that different candidate codeword sets correspond to different numbers of precoding matrices, and the number of precoding matrices is indicated by indicating the first codeword set used in multiple candidate codeword sets.

For another example, the first signaling is further used to indicate the number of elements in the first codeword set, and the first node can determine the number of precoding matrices according to the number of elements in the first codeword set. Exemplarily, the number of elements in the first codeword set and the number of precoding matrices have a certain corresponding relationship, and the first node can determine the number of precoding matrices according to the number of elements in the first codeword set. The signaling indicates the number of elements in the first codeword set, thereby indicating the number of precoding matrices.

For another example, the first signaling is further used to indicate a frequency band for transmitting data, and the frequency band for transmitting data is used to determine the number of precoding matrices. As an example, the first signaling further includes a fourth field, and the fourth field is used to indicate a frequency band for transmitting data.

It should be understood that the frequency band of transmitted data will change in real time. For example, parameters such as the position and size of the frequency band of transmitted data will change in real time. The second node indicates the frequency band of transmitted data through the fourth field of the first signaling to indicate the change of the frequency band of transmitted data in real time, so that the first node can adapt to the task of transmitting data, adapt to the fading changes of the channel in the frequency domain, avoid interference, etc.

As a possible example, after determining the frequency band for transmitting data, the number of precoding matrices can be determined based on the number of frequency domain units included in the frequency band for transmitting data. For example, one frequency domain unit corresponds to one precoding matrix, and the number of frequency domain units included in the frequency band for transmitting data is the number of precoding matrices. For another example, multiple frequency domain units correspond to one precoding matrix. Exemplarily, assuming that R frequency domain units correspond to one precoding matrix, and the number of frequency domain units included in the frequency band for transmitting data is N, the number of precoding matrices can be a function of N/R, or can be a function of N and R.

The size or dimension of the frequency domain unit is determined by a protocol, or indicated by a first signaling, or indicated by a second signaling. The value of R can be indicated by a first signaling, and the second signaling is a signaling different from the first signaling.

As another possible example, after the frequency band for transmitting data is determined, the number of precoding matrices may be determined based on the position of the frequency band for transmitting data in the partial bandwidth BWP.

It should be understood that the first signaling is used to indicate the frequency band of the transmitted data to indicate the change of the frequency band of the transmitted data. The number of precoding matrices indicated by the first signaling is determined by the number of frequency domain units included in the frequency band indicated by the first signaling or the position of the frequency band, so that the number of precoding matrices can adapt to the change of the bandwidth of the transmitted data in real time. In this way, by using a control signaling of a certain size to indicate the precoding matrix that can match the channel state that changes in the frequency domain, the efficiency of data transmission is improved while reducing the signaling overhead of indicating the precoding matrix to be used by the first node.

The following is an example of how to determine the first codeword set.

Example 1: The first codeword set is determined from multiple candidate codeword sets according to the number of precoding matrices.

That is to say, the first node can determine the first codeword set from multiple candidate codeword sets based on the number of precoding matrices. For example, the number of candidate precoding matrices corresponds to the candidate codeword set one-to-one, and the first codeword set can be indicated from multiple candidate codeword sets by indicating the number of a precoding matrix through the first signaling. For another example, the number of candidate precoding matrices corresponds to the candidate codeword set, and the number of each candidate precoding matrix corresponds to a codeword set. By indicating the number of a precoding matrix through the first signaling, the first codeword set can be indicated from multiple candidate codeword sets.

For another example, the number of precoding matrices indicated by the first signaling is M, the number of bits of the precoding matrix indicated by the first signaling is T, the average number of bits k occupied by each precoding matrix is T/M, and the first codeword set is determined from multiple candidate codeword sets based on the value range of the average number of bits k occupied by each precoding matrix; or the first codeword set is determined from multiple candidate codeword sets based on a comparison relationship between the value of the average number of bits k occupied by each precoding matrix and the number of elements included in each candidate codeword set.

For another example, the number of precoding matrices indicated by the first signaling is M, and the first codeword set is determined from multiple candidate codeword sets based on the value range of the number of precoding matrices; or, the first codeword set is determined from multiple candidate codeword sets based on a comparison relationship between the number of precoding matrices and the number of elements included in each candidate codeword set in the multiple candidate codeword sets.

It should be understood that determining the first codeword set from multiple candidate codeword sets through the number of precoding matrices indicated by the first signaling can balance the number of precoding matrices used on the frequency band for transmitting data and the bit overhead of indicating each precoding matrix on average. In this way, by using a control signaling of a certain size to indicate a precoding matrix that can match a channel state that changes in the frequency domain, the efficiency of data transmission is improved while reducing the signaling overhead of indicating the precoding matrix that the first node should use.

Example 2: The first signaling further includes a second field, and the second field is used to determine the first codeword set from multiple candidate codeword sets.

For example, the second field is used to indicate the first codeword set from the candidate multiple codeword sets, that is, a codeword set is selected from the candidate multiple codeword sets as the first codeword set. For another example, the second field is used to indicate the elements or codewords included in the first codeword set, so as to determine the first codeword set from the candidate multiple codeword sets based on the elements or codewords included in the first codeword set indicated by the second field.

Example 3: The first signaling further includes a third field, and the third field is used to select codewords from the second codeword set to form the first codeword set.

In this way, the first codeword set can be understood as a subset of the second codeword set.

As an example, assuming that the third domain is used to select 2 codewords from the second codeword set to form the first codeword set, that is, the first codeword set includes a third precoding matrix and a fourth precoding matrix, the third precoding matrix corresponds to one of the 2 codewords, and the fourth precoding matrix corresponds to the other of the 2 codewords. Based on this, the first domain includes a plurality of bits, each bit corresponds to a frequency domain unit in the frequency band of the transmitted data, and the value of each bit is used to indicate that the frequency domain unit corresponding to the bit applies the third precoding matrix or the fourth precoding matrix.

Exemplarily, a bit includes a first value and a second value. When the bit takes the first value, the bit is used to indicate that the frequency domain unit corresponding to the bit applies the third precoding matrix. When the bit takes the second value, the bit is used to indicate that the frequency domain unit corresponding to the bit applies the fourth precoding matrix. The first value may be one of the value ranges [0,1], and the second value may be another of the value ranges [0,1].

It should be understood that the third field of the first signaling is used to select codewords from the second codeword set to form the first codeword set, that is, the first signaling is used to select codewords from the second codeword set to form the first codeword set, so that the precoding matrix applied by the first node can adapt to the channel state of the frequency band of the transmitted data. Each bit of the first field corresponds to the frequency domain unit of the frequency band of the transmitted data, and one bit is used to indicate which precoding matrix is applied to the frequency domain unit corresponding to the bit, so that the first field can indicate In this way, as many precoding matrices as possible are indicated to adapt to the changes in the channel state of the frequency band of the transmitted data. In this way, by using a certain size of control signaling to indicate the precoding matrix that can match the channel state that changes in the frequency domain, the efficiency of data transmission is improved while reducing the signaling overhead of indicating the precoding matrix that the first node should use.

In some embodiments, in the case of Example 2 above, that is, when the second field is used to determine the first codeword set from multiple candidate codeword sets, after the first codeword set is determined, the number of precoding matrices can be determined based on the first codeword set and the number of bits of the first field. In other words, the number of precoding matrices is determined according to the first codeword set and the number of bits of the first field of the first signaling.

For example, the number of precoding matrices may be a function of the information entropy of the first codeword set and the number of bits of the first domain. For another example, the number of precoding matrices may be the quotient of the number of bits of the first domain and the information entropy of the first codeword set. For another example, the number of precoding matrices may be a function of the number of elements of the first codeword set and the number of bits of the first domain. For another example, the number of elements of the first codeword set is M, the number of bits of the first domain is W, and the logarithm of the number of elements of the first codeword set M to the base 2 is L, then the number of precoding matrices is a function of L and W, or the number of precoding matrices is an integer of the quotient of W divided by L. The integer of the quotient may be an integer rounded up, an integer rounded down, an integer rounded to the nearest integer, or an integer rounded in other ways. For another example, the number of precoding matrices is an integer of the quotient of W divided by an integer of L. The integer of L may be an integer rounded up, an integer rounded down, an integer rounded to the nearest integer, or an integer rounded in other ways. The integer of the quotient may be an integer rounded up, an integer rounded down, an integer rounded to the nearest integer, or an integer rounded in other ways.

In some embodiments, the first domain includes a plurality of bits, the plurality of bits are divided into M groups of bits, and each group of bits in the M groups of bits is used to determine a precoding matrix from the first codeword set. It should be understood that the first signaling indicates M precoding matrices, and when the first domain includes a plurality of bits, the correspondence between the bits in the plurality of bits and the M precoding matrices is unclear, and the first node cannot parse a specific precoding matrix from the plurality of bits. Therefore, the plurality of bits are divided into M groups of bits, and the M groups Each group of bits in the bits is used to determine a precoding matrix from the first codeword set, and the first node can determine M precoding matrices from the first codeword set based on the correspondence between each group of bits in the M groups of bits and the precoding matrix.

For example, taking the example of dividing every two adjacent bits of the multiple bits included in the first domain into a group of bits, an example of the correspondence between each group of bits in the M groups of bits and the precoding matrix can be that the 0th bit to the 1st bit of the multiple bits correspond to the 0th precoding matrix; the 2nd bit to the 3rd bit of the multiple bits correspond to the 1st precoding matrix; ...

For another example, taking the example of dividing every three adjacent bits of the multiple bits included in the first domain into a group of bits, another example of the correspondence between each group of bits in the M groups of bits and the precoding matrix is that the 0th bit to the 2nd bit of the multiple bits correspond to the 0th precoding matrix; the 3rd bit to the 5th bit of the multiple bits correspond to the 1st precoding matrix; ...

For another example, taking the example of dividing every four adjacent bits of the multiple bits included in the first domain into a group of bits, another example of the correspondence between each group of bits in the M groups of bits and the precoding matrix is that the 0th to 3rd bits of the multiple bits correspond to the 0th precoding matrix; the 4th to 7th bits of the multiple bits correspond to the 1st precoding matrix; ...

For another example, taking the example of dividing every k adjacent bits of the multiple bits included in the first domain into a group of bits, another example of the correspondence between each group of bits in the M groups of bits and the precoding matrix is that the 0th bit to the k-1th bit in the bit string corresponds to the 0th precoding matrix; the kth bit to the 2k-1th bit in the bit string corresponds to the 1st precoding matrix; ...; where k is an integer greater than 0.

For another example, taking the example of dividing every k adjacent bits of the multiple bits included in the first domain into a group of bits, another example of the correspondence between each group of bits in the M groups of bits and the precoding matrix is that the 0th bit to the k-1th bit of the multiple bits indicate the 0th codeword in the first codeword set, and the kth bit to the 2k-1th bit of the multiple bits indicate the 1st codeword in the first codeword set; the 2kth bit of the multiple bits corresponds to the 0th precoding matrix to indicate whether the 0th precoding matrix is the 0th codeword or the 1st codeword; the 2k+1th bit of the multiple bits corresponds to the 1st precoding matrix to indicate whether the 1st precoding matrix is the 0th codeword or the 1st codeword; ...; wherein k is an integer greater than 0.

For another example, assuming that the number of multiple bits is T, the number of bits used to indicate a precoding matrix is k, k is a function of T/M, or k is a function of T and M. The multiple bit strings included in the first domain are in order from the beginning to the end, and each k bits are used to indicate a precoding matrix. Then, another example of the corresponding relationship between each group of bits in the M groups of bits and the precoding matrix is that the 0th bit to the k-1th bit in the multiple bits correspond to the 0th precoding matrix, and the kth bit to the 2k-1th bit in the multiple bits correspond to the 1st precoding matrix; ...; wherein k is an integer greater than 0.

For another example, assuming that the number of multiple bits is T, the number of bits used to indicate a precoding matrix is k, k is a function of T/M, or k is a function of T and M. The multiple bit strings included in the first domain are in order from the beginning to the end, and each k bits are used to indicate a precoding matrix. Then another example of the correspondence between each group of bits in the M groups of bits and the precoding matrix is that the 0th bit to the k-1th bit of the multiple bits are used to indicate the 0th codeword in the first codeword set, and the kth bit to the 2k-1th bit of the multiple bits are used to indicate the 1st codeword in the first codeword set; the 2kth bit of the multiple bits corresponds to the 0th precoding matrix, which is used to indicate that the 0th precoding matrix is the 0th codeword or the 1st codeword; the 2k+1th bit of the multiple bits corresponds to the 1st precoding matrix, which is used to indicate that the 1st precoding matrix is the 0th codeword or the 1st codeword; ...; wherein k is an integer greater than 0.

In some embodiments, the first domain includes a first part, a second part, and a third part. Each of the first part, the second part, and the third part included in the first domain can be a bit string, that is, the first domain includes a first bit string, a second bit string, and a third bit string. In some embodiments, the first part is used to determine the fifth precoding matrix from the first codeword set. The second part is used to indicate the frequency domain unit in the frequency band of the transmission data to which the fifth precoding matrix is not applied, and the third part is used to indicate the precoding matrix applied by the frequency domain unit to which the fifth precoding matrix is not applied. The fifth precoding matrix can be understood as the precoding matrix applied by default for each frequency domain unit in the frequency band of the transmission data, that is, the first part is used to determine the default precoding matrix for each frequency domain unit in the frequency band of the transmission data from the first codeword set, the second part is used to indicate the frequency domain unit in the frequency band of the transmission data to which the default precoding matrix is not applied, and the third part is used to indicate the precoding matrix applied by the frequency domain unit to which the default precoding matrix is not applied.

In some embodiments, the third part includes multiple bits, each bit corresponds to a frequency domain unit to which the fifth precoding matrix is not applied, and the value of each bit is used to indicate that the frequency domain unit corresponding to the bit applies the sixth precoding matrix or the seventh precoding matrix, and the index number of the sixth precoding matrix in the first codeword set is greater than the index number of the seventh precoding matrix in the first codeword set.

Exemplarily, a bit includes a third value and a fourth value. When the bit takes the third value, the bit is used to indicate that the frequency domain unit corresponding to the bit applies the sixth precoding matrix. When the bit takes the fourth value, the bit is used to indicate that the frequency domain unit corresponding to the bit applies the seventh precoding matrix. The third value may be one of the value ranges [0,1], and the third value may be another of the value ranges [0,1].

As an example, taking the case where the third domain is used to select 3 codewords from the second codeword set to form the first codeword set, the sixth precoding matrix may be a codeword corresponding to a larger index number in the first codeword set except the index number corresponding to the fifth precoding matrix, and the seventh precoding matrix may be a codeword corresponding to a smaller index number in the first codeword set except the index number corresponding to the fifth precoding matrix.

As another example, taking the case where the third domain is used to select more than 3 codewords from the second codeword set to form the first codeword set, the sixth precoding matrix may be the codeword corresponding to the index number in the first codeword set whose index number is greater than the index number of the fifth precoding matrix by a preset value, and the seventh precoding matrix may be the codeword corresponding to the index number in the first codeword set whose index number is less than the index number of the fifth precoding matrix by a preset value.

Exemplarily, taking the preset value as 1, the sixth precoding matrix may be a codeword corresponding to an index number in the first codeword set whose index number is 1 greater than the index number of the fifth precoding matrix, and the seventh precoding matrix may be a codeword corresponding to an index number in the first codeword set whose index number is 1 less than the index number of the fifth precoding matrix.

In some embodiments, the value of the number M of precoding matrices is determined according to at least one of the following: the number of bits of the first domain, the first codeword set, and the frequency band of the transmitted data.

Taking the value of M as determined according to the number of bits in the first domain as an example, for example, the value of M is For example, the value of M is the product of the number of bits included in the first domain and the first coefficient; for example, the value of M is the rounded value of the product of the number of bits included in the first domain and the first coefficient. The first coefficient may be indicated by the second node, or may be pre-negotiated between the first node and the second node, and the embodiments of the present disclosure do not limit this.

It should be understood that the value of M is determined according to the number of bits included in the first field, so as to reflect the support of the number of bits included in the first field for different codewords as the precoding matrix, so as to improve the efficiency of data transmission.

Taking the value of M determined according to the first codeword set as an example, the value of M can be specifically determined according to the number of codewords included in the first codeword set. For example, the value of M is the product of the number of codewords included in the first codeword set and the second coefficient; for another example, the value of M is the rounded value of the product of the number of codewords included in the first codeword set and the second coefficient. The second coefficient may be indicated by the second node, or may be pre-negotiated between the first node and the second node, and the embodiments of the present disclosure do not limit this.

It should be understood that the value of M is determined according to the number of codewords in the first codeword set to reflect the association between the number of codewords included in the first codeword set and the number of different codewords used as the precoding matrix to improve the efficiency of data transmission.

Taking the example that the value of M is determined according to the frequency band of the transmitted data, the value of M can be specifically determined according to the number of frequency domain units included in the frequency band of the transmitted data. For example, the value of M is a certain proportion of the number of frequency domain units included in the frequency band of the transmitted data; for another example, the value of M is the product of the number of frequency domain units included in the frequency band of the transmitted data and the third coefficient; for another example, the value of M is the rounded value of the product of the number of frequency domain units included in the frequency band of the transmitted data and the third coefficient. The third coefficient may be indicated by the second node, or may be pre-negotiated between the first node and the second node, and the embodiments of the present disclosure do not limit this.

It should be understood that the value of M is determined according to the number of frequency domain units included in the frequency band of the transmitted data, so as to reflect the demand of the frequency band of the transmitted data for different codewords as the precoding matrix, so as to improve the efficiency of data transmission.

In some embodiments, the first signaling is also used to indicate the number of layers of spatial division multiplexing of the transmitted data. In combination with the first field of the above-mentioned first signaling, it is used to indicate that M precoding matrices are determined from the first codeword set. The first domain may include a fourth part and a fifth part, the fourth part is used to determine M precoding matrices from the first codeword set, wherein the precoding matrix of each layer of transmitted data is a linear combination of the M precoding matrices; the fifth part is used to indicate the corresponding coefficients of the M precoding matrices in the linear combination corresponding to each layer.

Step S102: Transmit data to the second node based on M precoding matrices.

After the first node determines the M precoding matrices based on the first signaling, the first node may apply the M precoding matrices indicated by the first signaling to the transmit antennas at the frequency band for transmitting data to transmit data to the second node.

In some embodiments, on the frequency band of transmitted data, one precoding matrix corresponds to one frequency domain unit, or one precoding matrix corresponds to a group of frequency domain units. One frequency domain unit may be one resource block, or multiple consecutive resource blocks. A group of frequency domain units may be multiple frequency domain units to which the same precoding matrix is applied according to a predefined rule.

Based on the embodiment shown in Figure 2, the first signaling is used to indicate the number of precoding matrices and to determine M precoding matrices from the first codeword set, that is, using one signaling to indicate the number of precoding matrices and to determine M precoding matrices from the first codeword set, the first node can determine M precoding matrices that match the channel state that changes in the frequency domain based on the first signaling, and then transmit data based on the M precoding matrices, which can improve the efficiency of data transmission. In this way, by using a certain size of control signaling to indicate the precoding matrix that can match the channel state that changes in the frequency domain, the efficiency of data transmission is improved while reducing the signaling overhead of indicating the precoding matrix that the first node should use.

In some embodiments, as shown in FIG. 3 , an embodiment of the present disclosure further provides a data receiving method, which is applied to a second node, and the second node may be the second node 120 shown in FIG. 1 , and the method includes the following steps:

Step S201: Send a first signaling.

In some embodiments, in order to improve the efficiency of data transmission, the second node sends a first signaling to the first node to indicate the precoding matrix to be used by the first node to transmit data, so that the first node The precoding matrix used in point transmission data can match the channel state that varies in the frequency domain, thereby improving the efficiency of data transmission.

The first signaling is used to indicate the number M of precoding and to determine M precoding matrices from the first codeword set.

For the relevant description of the first signaling, please refer to the relevant description of the first signaling in the above step S101, which will not be repeated here.

Step S202: receiving data.

The data is transmitted by the first node based on M precoding matrices indicated by the first signaling.

The above mainly introduces the solution provided by the present disclosure from the perspective of interaction between various nodes. It is understandable that each node, such as the first node and the second node, includes a hardware structure and/or software module corresponding to the execution of each function in order to realize the above functions. It should be easily appreciated by those skilled in the art that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

FIG4 is a schematic diagram showing the composition of a communication device provided by an embodiment of the present disclosure. As shown in FIG4 , the communication device 40 includes a receiving unit 401 and a sending unit 402 .

The communication device 40 may be the above-mentioned terminal or a chip in the terminal. When the communication device 40 is used to implement the functions of the terminal in the above-mentioned embodiment, each unit is specifically used to implement the following functions.

The receiving unit 401 is configured to receive a first signaling, where the first signaling is used to indicate the number M of precoding matrices, and to determine M precoding matrices from a first codeword set, where M is a positive integer.

The sending unit 402 is configured to transmit data to the second node based on the M precoding matrices.

In some embodiments, the first signaling includes a first field, and the first field is used to indicate that M precoding matrices are determined from a first codeword set.

In some embodiments, the first codeword set is selected from a plurality of candidate codewords according to the number of precoding matrices. Determined in the word set.

In some embodiments, the first signaling further includes a second field, and the second field is used to determine the first codeword set from a plurality of candidate codeword sets.

In some embodiments, the first signaling further includes a third field, and the third field is used to select a codeword from the second codeword set to form the first codeword set.

In some embodiments, the first field includes a plurality of bits, the plurality of bits are divided into M groups of bits, and each group of bits in the M groups of bits is used to determine a precoding matrix from the first codeword set.

In some embodiments, the M precoding matrices include at least a first precoding matrix and a second precoding matrix; the first field is used to indicate that the M precoding matrices are determined from a first codeword set, including: indicating the index number of the first precoding matrix in the first codeword set, and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set.

In some embodiments, each precoding matrix in the M precoding matrices corresponds to a frequency domain unit in a frequency band for transmitting data.

In some embodiments, the granularity of the frequency domain unit in the frequency band of transmitted data is determined according to the number of precoding matrices.

In some embodiments, the first field is used to indicate determining M precoding matrices from the first codeword set, including: determining a precoding matrix corresponding to each frequency domain unit in a frequency band for transmitting data from the first codeword set.

In some embodiments, the first codeword set includes a third precoding matrix and a fourth precoding matrix; the first domain includes multiple bits, each bit corresponds to a frequency domain unit in the frequency band of transmitted data, and the value of each bit is used to indicate that the frequency domain unit corresponding to the bit applies the third precoding matrix or the fourth precoding matrix.

In some embodiments, the first domain includes a first part, a second part, and a third part; wherein the first part is used to determine the fifth precoding matrix from the first codeword set; the second part is used to indicate the frequency domain unit where the fifth precoding matrix is not applied; and the third part is used to indicate the frequency domain unit where the fifth precoding matrix is not applied. The precoding matrix applied to the frequency domain units of the matrix.

In some embodiments, the third part includes multiple bits, each bit corresponds to a frequency domain unit to which the fifth precoding matrix is not applied, and the value of each bit is used to indicate that the frequency domain unit corresponding to the bit applies the sixth precoding matrix or the seventh precoding matrix, and the index number of the sixth precoding matrix in the first codeword set is greater than the index number of the seventh precoding matrix in the first codeword set.

In some embodiments, the value of M is determined according to at least one of the following: the number of bits of the first domain, the first codeword set, and the frequency band of the transmitted data.

In some embodiments, the first signaling further includes a fourth field, and the fourth field is used to indicate a frequency band for transmitting data.

In some embodiments, the first signaling is also used to indicate the number of spatial division multiplexing layers for transmitting data.

In some embodiments, the first domain includes a fourth part and a fifth part, the fourth part is used to indicate M precoding matrices from the first codeword set; wherein the precoding matrix of each layer of transmitted data is a linear combination of the M precoding matrices; and the fifth part is used to indicate the corresponding coefficients of the M precoding matrices in the linear combination corresponding to each layer.

FIG5 is a schematic diagram showing the composition of another communication device provided by an embodiment of the present disclosure. As shown in FIG5 , the communication device 50 includes a sending unit 501 and a receiving unit 502 .

The communication device 50 may be the above-mentioned base station or a chip in the base station. When the communication device 50 is used to implement the functions of the base station in the above-mentioned embodiment, each unit is specifically used to implement the following functions.

A sending unit 501 is configured to send a first signaling, where the first signaling is used to indicate the number M of precoding matrices and to determine M precoding matrices from a first codeword set, where M is a positive integer;

The receiving unit 502 is configured to receive data, where the data is transmitted by the first node based on M precoding matrices.

In some embodiments, the first signaling includes a first field, and the first field is used to indicate that M precoding matrices are determined from a first codeword set.

In some embodiments, the first codeword set is determined from a plurality of candidate codeword sets according to the number of precoding matrices.

In some embodiments, the first signaling further includes a second field, and the second field is used to determine the first codeword set from a plurality of candidate codeword sets.

In some embodiments, the first signaling further includes a third field, and the third field is used to select a codeword from the second codeword set to form the first codeword set.

In some embodiments, the first field includes a plurality of bits, the plurality of bits are divided into M groups of bits, and each group of bits in the M groups of bits is used to determine a precoding matrix from the first codeword set.

In some embodiments, the M precoding matrices include at least a first precoding matrix and a second precoding matrix; the first field is used to indicate that the M precoding matrices are determined from a first codeword set, including: indicating the index number of the first precoding matrix in the first codeword set, and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set.

In some embodiments, each precoding matrix in the M precoding matrices corresponds to a frequency domain unit in a frequency band for transmitting data.

In some embodiments, the granularity of the frequency domain unit in the frequency band of transmitted data is determined according to the number of precoding matrices.

In some embodiments, the first field is used to indicate determining M precoding matrices from the first codeword set, including: determining a precoding matrix corresponding to each frequency domain unit in a frequency band for transmitting data from the first codeword set.

In some embodiments, the first codeword set includes a third precoding matrix and a fourth precoding matrix; the first domain includes multiple bits, each bit corresponds to a frequency domain unit in the frequency band of transmitted data, and the value of each bit is used to indicate that the frequency domain unit corresponding to the bit applies the third precoding matrix or the fourth precoding matrix.

In some embodiments, the first domain includes a first part, a second part and a third part; wherein the first part is used to determine a fifth precoding matrix from the first codeword set; the second part is used to indicate frequency domain units to which the fifth precoding matrix is not applied; and the third part is used to indicate the precoding matrix applied to the frequency domain units to which the fifth precoding matrix is not applied.

In some embodiments, the third part includes multiple bits, each bit corresponds to a frequency domain unit to which the fifth precoding matrix is not applied, and the value of each bit is used to indicate that the frequency domain unit corresponding to the bit applies the sixth precoding matrix or the seventh precoding matrix, and the index number of the sixth precoding matrix in the first codeword set is greater than the index number of the seventh precoding matrix in the first codeword set.

In some embodiments, the value of M is determined according to at least one of the following: the number of bits of the first domain, the first codeword set, and the frequency band of the transmitted data.

In some embodiments, the first signaling further includes a fourth field, and the fourth field is used to indicate a frequency band for transmitting data.

In some embodiments, the first signaling is also used to indicate the number of spatial division multiplexing layers for transmitting data.

In some embodiments, the first domain includes a fourth part and a fifth part, the fourth part is used to indicate M precoding matrices from the first codeword set; wherein the precoding matrix of each layer of transmitted data is a linear combination of the M precoding matrices; and the fifth part is used to indicate the corresponding coefficients of the M precoding matrices in the linear combination corresponding to each layer.

If the various units in FIG. 4 and FIG. 5 are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present disclosure is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the various embodiments of the present disclosure. The storage medium for storing computer software products includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc. Various media that can store program codes.

In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiment of the present disclosure provides a schematic diagram of the structure of a communication device, which may be the above-mentioned communication device 40 or communication device 50. As shown in FIG6 , the communication device 60 includes: a processor 602, a communication interface 603, Bus 604. Optionally, the communication device 60 may further include a memory 601.

The processor 602 may be a processor that implements or executes various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present disclosure. The processor 602 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of the present disclosure. The processor 602 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.

The communication interface 603 is used to connect with other devices through a communication network. The communication network can be Ethernet, wireless access network, wireless local area network (WLAN), etc.

The memory 601 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

As a possible implementation, the memory 601 may exist independently of the processor 602, and the memory 601 may be connected to the processor 602 via a bus 604 to store instructions or program codes. When the processor 602 calls and executes the instructions or program codes stored in the memory 601, the data transmission method and the data receiving method provided in the embodiment of the present disclosure can be implemented.

In another possible implementation, the memory 601 may also be integrated with the processor 602 .

The bus 604 may be an extended industry standard architecture (EISA) bus, etc. The bus 604 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, FIG6 shows only one thick line, but does not mean that there is only one bus or one type of bus.

Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned models is used as an example. In actual applications, the above-mentioned functions can be allocated to different models as needed, that is, the internal structure of the base station or terminal is divided into different models to complete all or part of the functions described above.

The disclosed embodiment also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by computer instructions to instruct the relevant hardware, and the program can be stored in the above computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The computer-readable storage medium can be the memory or memory of any of the above embodiments. The above computer-readable storage medium can also be an external storage device of the above base station or terminal, such as a plug-in hard disk, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. equipped on the above base station or terminal. Further, the above computer-readable storage medium can also include both the internal storage unit of the above base station or terminal and an external storage device. The above computer-readable storage medium is used to store the above computer program and other programs and data required by the above base station or terminal. The above computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

The embodiments of the present disclosure also provide a computer program product, which includes a computer program. When the computer program product is run on a computer, the computer is enabled to execute any one of the data transmission methods and data receiving methods provided in the above embodiments.

Although the present disclosure is described herein in conjunction with various embodiments, in the process of implementing the claimed disclosure, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Although the present disclosure has been described in conjunction with specific features and embodiments thereof, it will be apparent that Various modifications and combinations may be made to the present disclosure without departing from the spirit and scope of the present disclosure. Accordingly, this specification and the drawings are merely exemplary illustrations of the present disclosure as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present disclosure. Obviously, those skilled in the art may make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims (36)

A data transmission method, wherein the method is applied to a first node, the method comprising: Receiving a first signaling, where the first signaling is used to indicate the number M of precoding matrices, and determining M precoding matrices from a first codeword set, where M is a positive integer; Data is transmitted to the second node based on the M precoding matrices. The method according to claim 1, wherein the first signaling includes a first field, and the first field is used to indicate that the M precoding matrices are determined from the first codeword set. The method according to claim 2, wherein the first codeword set is determined from a plurality of candidate codeword sets according to the number of the precoding matrices. The method according to claim 2, wherein the first signaling further includes a second field, and the second field is used to determine the first codeword set from a plurality of candidate codeword sets. The method according to claim 2, wherein the first signaling further includes a third field, and the third field is used to select codewords from the second codeword set to form the first codeword set. The method according to claim 2, wherein the first field comprises a plurality of bits, the plurality of bits are divided into M groups of bits, and each group of bits in the M groups of bits is used to determine a precoding matrix from the first codeword set. The method according to claim 2, wherein the M precoding matrices include at least a first precoding matrix and a second precoding matrix; The first domain is used to indicate that the M precoding matrices are determined from the first codeword set, including: indicating the index number of the first precoding matrix in the first codeword set, and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set. The method according to claim 2, wherein each of the M precoding matrices corresponds to a frequency domain unit in a frequency band for transmitting data. The method according to claim 8, wherein the granularity of the frequency domain unit in the frequency band of the transmission data is determined according to the number of the precoding matrices. The method according to claim 8, wherein the first domain is used to indicate that the M precoding matrices are determined from the first codeword set, comprising: determining, from the first codeword set, a precoding matrix corresponding to each frequency domain unit in the frequency band of the transmission data. The method according to claim 8, wherein the first codeword set includes a third precoding matrix and a fourth precoding matrix; the first domain includes multiple bits, each of the bits corresponds to a frequency domain unit in a frequency band for transmitting data, and the value of each of the bits is used to indicate that the frequency domain unit corresponding to the bit applies the third precoding matrix or the fourth precoding matrix. The method according to claim 8, wherein the first domain includes a first part, a second part and a third part; wherein the first part is used to determine a fifth precoding matrix from the first codeword set; the second part is used to indicate a frequency domain unit to which the fifth precoding matrix is not applied; and the third part is used to indicate a precoding matrix applied to the frequency domain unit to which the fifth precoding matrix is not applied. The method according to claim 12, wherein the third part includes multiple bits, each of the bits corresponds to a frequency domain unit to which the fifth precoding matrix is not applied, and the value of each of the bits is used to indicate that the frequency domain unit corresponding to the bit applies a sixth precoding matrix or a seventh precoding matrix, and the index number of the sixth precoding matrix in the first codeword set is greater than the index number of the seventh precoding matrix in the first codeword set. The method according to claim 2, wherein the value of M is determined according to at least one of the following: the number of bits of the first domain, the first codeword set, and the frequency band of the transmitted data. The method according to claim 2, wherein the first signaling further includes a fourth field, and the fourth field is used to indicate a frequency band for transmitting data. The method according to claim 2, wherein the first signaling is also used to indicate the number of spatial division multiplexing layers of the transmitted data. The method according to claim 16, wherein the first domain includes a fourth part and a fifth part, the fourth part is used to indicate the M precoding matrices from the first codeword set; wherein the precoding matrix of each layer of the transmitted data is a linear combination of the M precoding matrices The fifth part is used to indicate the coefficients corresponding to each of the M precoding matrices in the linear combination corresponding to each layer. A data receiving method, wherein the method is applied to a second node, the method comprising: Sending a first signaling, where the first signaling is used to indicate the number M of precoding matrices and to determine M precoding matrices from a first codeword set, where M is a positive integer; Data is received, where the data is transmitted by the first node based on the M precoding matrices. The method according to claim 18, wherein the first signaling includes a first field, and the first field is used to indicate that the M precoding matrices are determined from the first codeword set. The method according to claim 19, wherein the first codeword set is determined from a plurality of candidate codeword sets according to the number of the precoding matrices. The method according to claim 19, wherein the first signaling further includes a second field, and the second field is used to determine the first codeword set from a plurality of candidate codeword sets. The method according to claim 19, wherein the first signaling further includes a third field, and the third field is used to select codewords from the second codeword set to form the first codeword set. The method according to claim 19, wherein the first field comprises a plurality of bits, the plurality of bits are divided into M groups of bits, and each group of bits in the M groups of bits is used to determine a precoding matrix from the first codeword set. The method according to claim 19, wherein the M precoding matrices include at least a first precoding matrix and a second precoding matrix; The first domain is used to indicate that the M precoding matrices are determined from the first codeword set, including: indicating the index number of the first precoding matrix in the first codeword set, and the relative value of the index number of the second precoding matrix in the first codeword set relative to the index number of the first precoding matrix in the first codeword set. The method according to claim 19, wherein each of the M precoding matrices corresponds to a frequency domain unit in a frequency band for transmitting data. The method according to claim 25, wherein the frequency domain in the frequency band of the transmission data The granularity of the unit is determined according to the number of the precoding matrices. The method according to claim 25, wherein the first domain is used to indicate the determination of the M precoding matrices from the first codeword set, comprising: determining, from the first codeword set, a precoding matrix corresponding to each frequency domain unit in the frequency band of the transmission data. The method according to claim 25, wherein the first codeword set includes a third precoding matrix and a fourth precoding matrix; the first domain includes multiple bits, each of the bits corresponds to a frequency domain unit in a frequency band for transmitting data, and the value of each of the bits is used to indicate that the frequency domain unit corresponding to the bit applies the third precoding matrix or the fourth precoding matrix. The method according to claim 25, wherein the first domain includes a first part, a second part and a third part; wherein the first part is used to determine a fifth precoding matrix from the first codeword set; the second part is used to indicate frequency domain units to which the fifth precoding matrix is not applied; and the third part is used to indicate the precoding matrix applied to the frequency domain units to which the fifth precoding matrix is not applied. The method according to claim 29, wherein the third part includes multiple bits, each of the bits corresponds to a frequency domain unit to which the fifth precoding matrix is not applied, and the value of each of the bits is used to indicate that the frequency domain unit corresponding to the bit applies the sixth precoding matrix or the seventh precoding matrix, and the index number of the sixth precoding matrix in the first codeword set is greater than the index number of the seventh precoding matrix in the first codeword set. The method according to claim 19, wherein the value of M is determined according to at least one of the following: the number of bits of the first domain, the first codeword set, and the frequency band of the transmitted data. The method according to claim 19, wherein the first signaling further includes a fourth field, and the fourth field is used to indicate a frequency band for transmitting data. The method according to claim 19, wherein the first signaling is also used to indicate the number of spatial division multiplexing layers of the transmitted data. The method according to claim 33, wherein the first domain comprises a fourth part and a fifth part, the fourth part being used to indicate the M precoding matrices from the first codeword set. wherein the precoding matrix of each layer of the transmitted data is a linear combination of the M precoding matrices; the fifth part is used to indicate the coefficients corresponding to each of the M precoding matrices in the linear combination corresponding to each layer. A communication device, comprising a memory, a processor, and computer program instructions stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 34 when executing the computer program instructions. A computer-readable storage medium, wherein the computer-readable storage medium comprises computer program instructions; wherein, when the computer program instructions are executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 34.