WO2021047594A1

WO2021047594A1 - Information reporting and sending method, terminal device, and network device

Info

Publication number: WO2021047594A1
Application number: PCT/CN2020/114518
Authority: WO
Inventors: 郤伟; 孙鹏
Original assignee: 维沃移动通信有限公司
Priority date: 2019-09-12
Filing date: 2020-09-10
Publication date: 2021-03-18
Also published as: CN112491451B; CN112491451A

Abstract

Disclosed are an information reporting and sending method, a terminal device, and a network device. The information reporting method is applied to a terminal device, and comprises: determining an impulse response of a downlink channel according to a channel state information-reference signal (CSI-RS) issued by a network device; determining, according to the impulse response, phase information of at least one path corresponding to the downlink channel; and reporting, to the network device, the phase information of the at least one path, wherein the phase information is used by the network device to determine a pre-coding matrix for downlink transmission.

Description

Information reporting and sending method, terminal equipment and network equipment

Cross-references to related applications

This application claims the priority of the Chinese patent application 201910866032.2 entitled "An Information Reporting, Sending Method, Terminal Equipment and Network Equipment" filed on September 12, 2019. The entire content of this application is incorporated herein by reference. .

Technical field

The invention belongs to the field of communication technology, and specifically relates to an information reporting and sending method, terminal equipment and network equipment.

Background technique

Generally, when a terminal device communicates with a network device, it can feed back the channel state information (CSI) of the downlink channel to the network device, so that the network device can determine the precoding matrix for downlink transmission based on the CSI fed back by the terminal device , And send data to the terminal device based on the precoding matrix, so as to obtain better link performance.

With the development of multi-antenna technology (Multi-Input Multi-Output, MIMO), terminal devices and network devices are increasingly communicating based on multi-antenna technology. When communicating based on multi-antenna technology, the terminal device also needs to feed back CSI to the network device. Among them, in order to reduce the resource overhead when the terminal device feeds back CSI to the network device under MIMO, the terminal device usually feeds back the CSI to the network device in an implicit feedback manner. For example, the terminal device can send a sounding reference signal (Sounding Reference Signal, SRS) to the network device, and the network device can determine the uplink channel information based on the SRS, and use the mutual difference between the uplink channel and the downlink channel to determine the downlink channel information, and then determine it for the downlink The transmitted precoding matrix.

Generally, channel disparity exists in Time Division Duplex (TDD) systems and Frequency Division Duplex (FDD) systems. However, in FDD systems, this disparity is only part of the channel disparity. (Partial reciprocity), that is, in the angle domain, the angle of departure (Angle of Departure, AoD) of the downlink channel is equal to the angle of arrival (Angle of Arrival, AoA) of the uplink channel. In the delay domain, the uplink and downlink channels have the same multipath Yanhe multipath power. However, because the uplink and downlink channels in the FDD system are located at different carrier frequencies, the wavelengths corresponding to the uplink and downlink wireless transmission are different. As a result, in the FDD system, the network device cannot effectively determine the precoding matrix for downlink transmission based on the channel disparity.

Summary of the invention

The embodiments of the present invention provide an information reporting and sending method, terminal equipment and network equipment to solve the problem that in an FDD system, the network equipment cannot effectively determine the precoding matrix for downlink transmission based on channel disparity.

In order to solve the above technical problems, the present invention is implemented as follows:

In the first aspect, an information reporting method is provided, including:

Determine the impulse response of the downlink channel according to the channel state information reference signal CSI-RS issued by the network device;

Determining the phase information of at least one path corresponding to the downlink channel according to the impulse response;

Reporting the phase information of the at least one path to the network device, where the phase information is used by the network device to determine a precoding matrix for downlink transmission.

In the second aspect, an information sending method is provided, including:

Receiving phase information of at least one path from a terminal device, where the at least one path is a path corresponding to a downlink channel, the phase information is determined by the terminal device according to the impulse response of the downlink channel, and the impulse response Determined by the terminal device according to the CSI-RS issued by the network device;

Determine the impulse response of the uplink channel according to the sounding reference signal SRS from the terminal device;

Determine a precoding matrix for downlink transmission according to the phase information and the impulse response of the uplink channel.

In a third aspect, a terminal device is provided, and the terminal device includes:

The measurement module is used to determine the impulse response of the downlink channel according to the channel state information reference signal CSI-RS issued by the network device;

A determining module, configured to determine phase information of at least one path corresponding to the downlink channel according to the impulse response;

The sending module is configured to report phase information of the at least one path to the network device, where the phase information is used by the network device to determine a precoding matrix for downlink transmission.

In a fourth aspect, a network device is provided, and the network device includes:

The receiving module is configured to receive phase information of at least one path from a terminal device, where the at least one path is a path corresponding to a downlink channel, and the phase information is determined by the terminal device according to the impulse response of the downlink channel, The impulse response is determined and obtained by the terminal device according to the CSI-RS issued by the network device;

The measurement module is used to determine the impulse response of the uplink channel according to the sounding reference signal SRS from the terminal equipment;

The determining module is configured to determine a precoding matrix for downlink transmission according to the phase information and the impulse response of the uplink channel.

In a fifth aspect, a terminal device is provided. The terminal device includes a processor, a memory, and a computer program that is stored on the memory and can run on the processor. When the computer program is executed by the processor, Implement the steps of the method as described in the first aspect.

In a sixth aspect, a network device is provided. The network device includes a processor, a memory, and a computer program that is stored on the memory and can run on the processor. When the computer program is executed by the processor, Implement the steps of the method as described in the second aspect.

In a seventh aspect, a computer-readable storage medium is provided, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method described in the first aspect are implemented .

In an eighth aspect, a computer-readable storage medium is provided, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method described in the second aspect are implemented .

In the embodiment of the present invention, based on the partial disparity between the uplink channel and the downlink channel in the FDD system, the terminal device can determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, and determine the downlink channel based on the impulse response. The phase information of at least one path corresponding to the channel is reported, and the phase information of the at least one path is reported to the network device. In this way, based on the partial disparity of the channel, the network equipment can determine the precoding matrix used for downlink transmission by combining the phase information of at least one path of the downlink channel reported by the terminal device on the premise that the uplink channel impulse response is known. Therefore, the downlink transmission throughput can be improved by optimizing the downlink precoding design.

Description of the drawings

The drawings described here are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and the description thereof are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

FIG. 1 is a schematic flowchart of an information reporting method provided by an embodiment of the present invention;

2 is a schematic flowchart of an information sending method provided by an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a terminal device provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of a network device provided by an embodiment of the present invention;

Figure 5 is a schematic structural diagram of a terminal device provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a network device provided by an embodiment of the present invention.

detailed description

Generally, when a terminal device and a network device communicate based on the multi-antenna technology, the terminal device can feed back CSI to the network device based on the reciprocity of the uplink and downlink channels, so that the network device can determine a precoding matrix for downlink transmission. Specifically, the terminal device may send a sounding reference signal (Sounding Reference Signal, SRS) to the network device, and the network device may determine the uplink channel information based on the SRS, and determine the downlink channel information by using the disparity between the uplink channel and the downlink channel, and then determine the Precoding matrix for downlink transmission.

However, in the FDD system, the mutual dissimilarity of the uplink and downlink channels is only partial dissimilarity, that is, in the angle domain, the departure angle of the downlink channel is equal to the arrival angle of the uplink channel. In the delay domain, the uplink and downlink channels have the same multipath time. However, because the uplink and downlink channels in the FDD system are located at different carrier frequencies, the corresponding wavelengths for uplink and downlink wireless transmission are different. In this way, the terminal device will not be able to effectively feed back the CSI to the network device based on the channel reciprocity.

In an actual FDD system, research has found that in the delay domain, for any path, the uplink and downlink transmission distances are the same, but the wavelengths are different, so the phase of the path in the uplink and downlink channel impulse responses is different. In this way, if the network device knows the phase information of the path corresponding to the downlink channel, the network device can determine the precoding matrix for downlink transmission based on the phase information and the partial disparity of the uplink and downlink channels.

In view of this, the embodiments of the present invention provide an information reporting and sending method, terminal equipment and network equipment. The terminal equipment is based on the partial difference between the uplink channel and the downlink channel in the FDD system. The CSI-RS determines the impulse response of the downlink channel, determines the phase information of at least one path corresponding to the downlink channel according to the impulse response, and reports the phase information of the at least one path to the network device. In this way, based on the partial disparity of the channel, the network equipment can determine the precoding matrix used for downlink transmission by combining the phase information of at least one path of the downlink channel reported by the terminal device on the premise that the uplink channel impulse response is known. Therefore, the downlink transmission throughput can be improved by optimizing the downlink precoding design.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The technical solution of the present invention can be applied to various communication systems, such as: Long Term Evolution (LTE)/Long Term Evolution advanced (LTE-A) system, LTE Frequency Division Duplex, FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunications System (UMTS) or Worldwide Interoperability for Microwave Access (WiMAX) communication system, 5G system, In other words, the New Radio (NR) system and so on.

Terminal equipment can be understood as user equipment (User Equipment, UE), and can also be referred to as mobile terminal (Mobile Terminal), mobile user equipment, etc., and can be connected to one or more devices via a radio access network (e.g., Radio Access Network, RAN). A core network for communication. The terminal device can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal. For example, it can be portable, pocket-sized, handheld, built-in computer or vehicle-mounted Mobile devices can also be flying equipment such as drones and aircraft, which exchange language and/or data with the wireless access network.

Network equipment can be understood as a core network or a base station. The base station can be a base station (BTS) in GSM or CDMA, a base station (NodeB) in WCDMA, or a base station in LTE. Evolved base station (eNB or evolutional Node B, e-NodeB) and 5G base station (gNB), as well as network side equipment in subsequent evolved communication systems, are not limited in the present invention, but for ease of description, the following embodiments take gNB as Examples are explained.

The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic flowchart of an information reporting method according to an embodiment of the present invention. The method is applied to a terminal device and specifically may include the following steps.

S102: Determine the impulse response of the downlink channel according to the channel state information reference signal CSI-RS issued by the network device.

In a frequency division duplex (Frequency Division Duplex, FDD) system, terminal equipment and network equipment are communicating based on multi-antenna technology (Multi-Input Multi-Output, MIMO). The network equipment is sending downlink data to the terminal equipment. Previously, channel state information reference signals (Channel State Information-Reference Signals, CSI-RS) can be pre-configured, and the CSI-RS can be delivered to the terminal device.

After the terminal device receives the CSI-RS issued by the network device, it can estimate the impulse response of the downlink channel based on the CSI-RS measurement, so that it can subsequently feed back the channel state information of the downlink channel to the network device through implicit feedback. State Information, CSI).

In this embodiment, the impulse response of the downlink channel may include one or more paths (that is, the downlink channel may correspond to one or more paths), assuming that the number of ports of the network device is N _t , and the number of receiving antennas of the terminal device is N _r _{, that is, N r} ×N _t antenna port pairs can be combined between the terminal equipment and the network equipment. Then, if the impulse response of the downlink channel includes P paths, it corresponds to the antenna port pair (n _r , n _t ) The impulse response component of the p-th path can be expressed as:

among them,

Is a complex number, including real and imaginary parts, n _r =1,2,...,N _r , n _t =1,2,...,N _t , p =1,2,...,P.

S104: Determine the phase information of at least one path corresponding to the downlink channel according to the impulse response.

In S104, after obtaining the impulse response of the downlink channel, the terminal device may determine the phase information of at least one path corresponding to the downlink channel.

In this embodiment, the at least one path corresponding to the downlink channel may include the paths corresponding to the multiple antenna port pairs described above, where there may be one or more paths corresponding to one antenna port pair. In addition, the paths corresponding to multiple antenna port pairs can share phase information (that is, multiple antenna ports have the same phase information for the corresponding paths), or they may not share phase information (that is, multiple antenna ports have different paths for the corresponding paths). Phase information).

When the terminal device determines the phase information of at least one path corresponding to the downlink channel according to the impulse response of the downlink channel, take one of the antenna port pairs (for easy distinction, the following can be represented by the target antenna port pair) as an example, which may specifically include The following steps:

First, select at least one target path from the path corresponding to the antenna port pair according to the corresponding impulse response of one antenna port in the plurality of antenna port pairs, wherein the strength of at least one target path is greater than that of the target antenna port pair. The strength of the remaining paths.

In this embodiment, at least one target path can be expressed as

Among them, n _r =1,2,...,N _r and n _t =1,2,...,N _t . When selecting at least one target path from the paths corresponding to the target antenna port pair, at least the following two methods may be included:

the first method:

A set number of paths are selected from the paths corresponding to the antenna port pair, and the strength of the set number of paths is greater than the strength of other paths corresponding to the target antenna port pair. Among them, the set number is a protocol value or pre-configured by the network device.

Specifically, the terminal device can directly select the strongest N paths as the target path according to the strength of the impulse response component of the target antenna port to each corresponding path, that is, the target path

The number of

Where, N is the set number described above.

The second method:

Select at least one path whose strength is greater than or equal to the set threshold from the paths corresponding to the antenna port pair, and use the selected at least one path as the target path. Among them, the set threshold is a protocol value or pre-configured by the network device.

In an implementation manner, the set threshold may be an absolute threshold. When selecting the target path, the terminal device may directly select at least one path with a strength greater than or equal to the absolute threshold from the path corresponding to the target antenna port pair as the target path.

Take the impulse response component of the target antenna port to the corresponding path as recorded in S102

As an example, at least one target path selected by the terminal device according to the absolute threshold can be expressed as:

T ₁ is the absolute threshold.

In another implementation manner, the set threshold may also be a threshold relative to a certain reference value, where the reference value may preferably be the intensity value of the strongest path corresponding to the target antenna port pair. In this way, when the terminal device selects at least one target path, it can select at least one path whose strength is greater than or equal to the relative threshold from the path corresponding to the target antenna port pair as the target path.

Still with the above

As an example, suppose the relative threshold is the threshold relative to the strongest path, and the impulse response component of the strongest path is expressed as

Then, the at least one target path selected by the terminal device according to the relative threshold can be expressed as:

or,

Among them, T ₂ and T ₃ are relative thresholds.

Secondly, the phase information of at least one target path is determined according to the impulse response component of at least one target path.

In this embodiment, the phase information may include at least one of the respective phases of at least one target path and the phase difference between at least one target path (for the case where the number of target paths is greater than 1).

If the phase information includes the respective phases of at least one target path, when determining the phase information of the at least one target path, the respective phases of the at least one target path can be calculated directly based on the respective impulse response components of the at least one target path.

If the phase information includes the phase difference between at least one target path, when determining the phase information of at least one target path, one path in the target path can be used as the reference path, and according to the impulse response component of the reference path and the target path Determine the phase difference between the reference path and the remaining paths by using the impulse response components of the remaining paths. Preferably, the reference path may be the path with the strongest intensity among the target paths.

Take at least one target path as

As an example, suppose the reference path is

Medium and strongest path

Then the phase difference between the reference path and the remaining paths can be expressed as:

or,

Among them, ang is the operation of taking the complex auxiliary angle.

It should be noted that in this embodiment, by selecting at least one target path from the paths corresponding to the antenna port pair, and determining the phase information of the at least one target path, the amount of phase information subsequently reported to the network device can be reduced, thereby reducing uplink resources. In addition, by determining the phase information of the path with higher intensity, the terminal device can also avoid reporting the phase information of the path with weaker intensity that can be regarded as invalid when the phase information is subsequently reported. Optionally, without considering the consumption of uplink resources, when determining the phase information of the path corresponding to the antenna port pair, the terminal device may not distinguish between the strong path and the weak path, but determine the path of each path corresponding to the antenna port pair. Phase information. Here, the phase information of at least one target path can be determined as an example for description.

Optionally, after the terminal device determines and obtains the phase information of at least one target path corresponding to an antenna pair based on the above-mentioned method, if the number of target paths is greater than 1, it may also monotonically increase or increase the multiple target paths according to the intensity. Arrange in a monotonically decreasing order to obtain a path list corresponding to multiple paths, and arrange the phase information of the multiple target paths according to the order in which the corresponding target paths are arranged in the path list to obtain the phase information corresponding to the multiple target paths Phase list.

That is to say, the multiple target paths included in the path list are ordered, and the phase information included in the phase list is also ordered. In this way, after the phase information is subsequently reported to the network device, the network device can follow the path list and The order of the phase list determines which phase information in the phase list corresponds to which target path. Wherein, if the phase information in the phase list is a phase difference, the number of elements in the phase list is one less than the number of elements in the path list.

In this embodiment, after the terminal device determines the phase information of the path corresponding to one antenna port, if multiple antenna ports have the same phase information for the corresponding path, the phase information of the path corresponding to the antenna port can be used as other antennas. The phase information of the path corresponding to the port pair is obtained, and then a path list and a phase list are obtained; if multiple antenna ports have different phase information for the corresponding paths, the phases of the paths corresponding to other target antenna ports can be determined based on the same method Information, and then obtain multiple path lists and multiple phase lists, where one antenna port pair corresponds to one path list and one phase list.

S106: Report the phase information of the at least one path to the network device, where the phase information is used by the network device to determine a precoding matrix for downlink transmission.

In S106, after the terminal device determines the phase information of at least one path corresponding to the downlink channel based on the method recorded in S104, it can report the phase information to the network device so that the network device can determine that it is used for downlink data transmission based on the phase information The precoding matrix.

Preferably, if the terminal device determines that the phase information of at least one target path recorded above is obtained, it may report the phase information of at least one target path to the network device. Wherein, when the terminal device reports the phase information of at least one target path to the network device, it can report the phase list recorded above to the network device, so that the network device can determine which phase information in the phase list based on the order of the phase list Which path corresponds to the downlink channel. In the following, the terminal device may report the phase information of at least one target path for description.

In this embodiment, before reporting the phase list to the network device, the terminal device may also quantify the phase information of at least one path in the phase list, so as to report the quantized phase information to the network device. Among them, the phase of one path After the information is quantized, at least one bit is obtained.

When the terminal equipment quantizes the phase information of at least one path, if the number of at least one path is greater than 1, the number of bits obtained after the quantization of the phase information of different paths can be the same, that is, the phase information of each path is quantized to be fixed The number of bits, where the fixed number of bits can be the protocol value, or can be pre-configured by the network device.

It should be noted that if the paths corresponding to multiple antenna port pairs between the terminal device and the network device have the same phase information, that is, multiple antenna port pairs correspond to a path list and a phase list, then it is assumed that the phase list is determined by Φ Means that Φ includes |Φ| elements, then the total number of phase information that needs to be quantized is |Φ|, the number of quantized bits is M×|Φ|, and M is obtained after quantizing each phase information The number of bits, || is the operator for taking the number of elements in the list.

If the paths corresponding to multiple antenna port pairs between the terminal device and the network device have different phase information, that is, multiple antenna port pairs correspond to multiple path lists and multiple phase lists, then it is assumed that the phase list is determined by

Means,

Include

Elements, then, the total number of phase information that needs to be quantized is

The number of bits after quantization is

M is the number of bits obtained after quantizing each phase information.

In addition, when the terminal device quantizes the phase information of at least one path, if the number of at least one path is greater than 1, the number of bits obtained after quantizing the phase information of different paths may also be different. Among them, the phase information of the first path The number of bits obtained after quantization is greater than the number of bits obtained after quantization of the phase information of the second path, and the strength of the first path is greater than the strength of the second path. That is to say, the phase information of the paths of different intensities is quantized with different accuracy. The stronger the intensity of the path, the greater the number of bits obtained after quantizing the phase information of the path.

It should be noted that regardless of whether the multiple antenna ports between the terminal device and the network device have the same phase information for the corresponding paths, when the phase information of different paths is quantized to obtain the quantization results with different numbers of bits, all The corresponding number of bits can be quantified according to the strength of the path, which will not be described in detail here.

After the terminal device quantizes the phase information of multiple paths, when reporting the quantized phase information to the network device, it can report the quantized phase information to the network device separately, or it can carry the quantized phase information in The channel state information (Channel State Information, CSI) is reported to the network device, which is not specifically limited here.

In addition, when the terminal device reports the quantized phase information to the network device, the reporting method can be at least one of periodic reporting, aperiodic reporting, and semi-continuous reporting, and the channel used can be a physical uplink control channel ( At least one of Physical Uplink Control Channel (PUCCH) and Physical Uplink Shared Channel (Physical Uplink Shared Channel, PUSCH) is not specifically limited here.

After the terminal device reports the quantized phase information of at least one path to the network device, the network device can determine the precoding matrix for downlink transmission based on the phase information. The specific implementation can be found in the embodiment shown in FIG. 2 The content is not repeated here.

FIG. 2 is a schematic flowchart of an information sending method according to an embodiment of the present invention. The information sending method is applied to a network device and may specifically include the following steps.

S202: Receive phase information of at least one path from a terminal device, at least one path is a path corresponding to a downlink channel, the phase information is determined by the terminal device according to the impulse response of the downlink channel, and the impulse response is issued by the terminal device according to the network device The CSI-RS is determined.

In the FDD system, in a scenario where terminal equipment and network equipment communicate based on multi-antenna technology, the network equipment can pre-configure CSI-RS before sending downlink data to the terminal equipment and deliver the CSI-RS to the terminal equipment.

After receiving the CSI-RS, the terminal device can determine the impulse response of the downlink channel based on the CSI-RS based on the method recorded in the embodiment shown in FIG. 1, and determine the phase information of at least one path corresponding to the downlink channel based on the impulse response , And send the phase information to the network device. At this time, the network device can receive the phase information from the terminal device.

S204: Determine the impulse response of the uplink channel according to the sounding reference signal SRS from the terminal device.

In S204, the network device can measure the impulse response of the uplink channel according to the sounding reference signal (Sounding Reference Signal, SRS) from the terminal device.

In this embodiment, the impulse response of the uplink channel may also include at least one path, and the at least one path may be at least one path included in the impulse response of the downlink channel. Assuming that the number of ports of the network device is N _t , and the number of receiving antennas of the terminal device is N _r _{, that is, N r} ×N _t antenna port pairs can be combined between the terminal device and the network device. Then, if the impulse of the uplink channel The response contains P paths, then the impulse response component of the p-th path corresponding to the antenna port pair (n _r , n _{t) can be expressed as:}

among them,

Is a complex number, including real and imaginary parts, n _r =1,2,...,N _r , n _t =1,2,...,N _t , p =1,2,...,P,

As described in the embodiment shown in Figure 1

The delay and amplitude are the same, but the phase is different.

S206: Determine a precoding matrix for downlink transmission according to the phase information and the impulse response of the uplink channel.

Specifically, first, the network device may determine the impulse response of the downlink channel according to the phase information from the terminal device and the impulse response of the uplink channel.

In the FDD system, based on the partial disparity of the uplink and downlink channels, it can be known that the delay and amplitude of each path in at least one path of the impulse response of the downlink channel are equal to each path corresponding to the impulse response of the uplink channel. The delay and amplitude of each path, therefore, in the case of known phase information of at least one path in the impulse response of the downlink channel, the impulse response of the downlink channel can be obtained based on the impulse response of the uplink channel recorded in S204 response.

The impulse response of the upstream channel is the above-mentioned record

The impulse response of the downlink channel is as described above

As an example, the impulse response of the downlink channel can be determined

among them,

j is the imaginary part symbol,

Quantized phase information for at least one path corresponding to the downlink channel,

Reason

A list of phases formed.

Secondly, according to the impulse response of the downlink channel, the precoding matrix for downlink transmission is determined.

Specifically, after determining to obtain the impulse response of the downlink channel, the network device may perform Fourier transform on the impulse response of the downlink channel to obtain the frequency domain response of the downlink channel, and the frequency domain response may be expressed as a matrix H _k , where: k=k ₁ , k ₁ +1,..., k ₂ , which can be specifically understood as a subcarrier index in a precoding resource group (Precoding Resource Group, PRG), and resource particles in the PRG can share the same precoding matrix.

After the frequency domain response H _k of the downlink channel is obtained, the eigenvalue decomposition of its autocorrelation matrix can be performed to obtain the eigenvalue matrix Q,

The precoding matrix W is then obtained, where the precoding matrix W is the first r column of the matrix Q, and r is the rank, which belongs to a part of the CSI, and can be specifically fed back by the terminal device to the network device.

In this way, after the network device obtains the precoding matrix W, it can send downlink data to the terminal device based on the precoding matrix, so as to obtain better link performance.

In the embodiment of the present invention, based on the partial disparity between the uplink channel and the downlink channel in the FDD system, the terminal device can determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, and then determine at least one corresponding to the downlink channel The phase information of the path, and the phase information of at least one path is reported to the network device. In this way, after the network device receives the phase information from the terminal device, it can be based on the partial disparity of the channel to determine the impulse response of the upstream channel. Under the premise, the phase information of at least one path of the downlink channel reported by the terminal device can be combined to determine the precoding matrix used for downlink transmission, so that the downlink transmission throughput can be improved by optimizing the downlink precoding design.

The foregoing describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than in the embodiments and still achieve desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown in order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device includes: a measurement module 31, a determination module 32, and a sending module 33, wherein:

The measurement module 31 is configured to determine the impulse response of the downlink channel according to the channel state information reference signal CSI-RS issued by the network device;

The determining module 32 is configured to determine the phase information of at least one path corresponding to the downlink channel according to the impulse response;

The sending module 33 is configured to report the phase information of at least one path to the network device, and the phase information is used by the network device to determine a precoding matrix for downlink transmission.

Optionally, the at least one path includes paths corresponding to multiple antenna port pairs;

Among them, an antenna port pair includes a transmitting port of a network device and a receiving antenna of a terminal device.

Optionally, the determining module 32 is used to:

Selecting at least one target path from the path corresponding to the antenna port pair according to the corresponding impulse response of one antenna port in the plurality of antenna port pairs, where the strength of the at least one target path is greater than the strength of the remaining paths corresponding to the antenna port pair;

Determine the phase information of at least one target path according to the impulse response component of the at least one target path;

The sending module 33 is configured to report the phase information of at least one target path to the network device.

Optionally, the determining module 32 is configured to select a set number of paths from the paths corresponding to the antenna port pair, and set the number as a protocol value or be pre-configured by the network device; select from the path corresponding to the antenna port pair At least one path whose strength is greater than or equal to a set threshold, the set threshold is an absolute threshold or a relative threshold, and the set threshold is a protocol value or pre-configured by a network device.

Optionally, the phase information includes at least one of phase and phase difference.

Optionally, the determining module 32 is configured to, if the phase information includes a phase difference, use one of the at least one target path as a reference path, and determine the reference path and the at least one target path based on the impulse response component of the at least one target path The phase difference between the remaining paths in the path.

Optionally, the determining module 32 is configured to determine the phase information of the at least one target path according to the impulse response component of the at least one target path, and if the number of the at least one target path is greater than 1, then the multiple target paths are The intensity is arranged in a monotonously increasing or monotonously decreasing order to obtain a path list of multiple target paths; the phase information is arranged in the order of the corresponding target paths in the path list to obtain a phase list of phase information.

Optionally, the sending module 33 is configured to quantize the phase information of at least one path, where the phase information of one path is quantized to obtain at least one bit; and the quantized phase information of the at least one path is reported to the network device.

Optionally, if the number of at least one path is greater than 1, the number of bits obtained after quantization of the phase information of different paths is the same; or, the number of bits obtained after quantization of the phase information of different paths is different, where the phase of the first path The number of bits obtained after information quantization is greater than the number of bits obtained after quantization of the phase information of the second path, and the strength of the first path is greater than the strength of the second path.

Optionally, the sending module 33 is configured to send channel state information CSI for downlink transmission to the network device, where the CSI includes quantized phase information of at least one path.

Optionally, the sending module 33 is configured to report the quantized phase information of at least one path to the network device based on at least one of periodic, aperiodic and semi-persistent.

Optionally, the sending module 33 is configured to report the quantized phase information of at least one path to the network device based on at least one of the physical uplink control channel PUCCH and the physical uplink shared channel PUSCH.

The terminal device provided in the embodiment of the present invention can implement each process implemented by the terminal device in the method embodiment in FIG. 1, and to avoid repetition, details are not described herein again. In the embodiment of the present invention, based on the partial disparity between the uplink channel and the downlink channel in the FDD system, the terminal device can determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, and determine the downlink channel based on the impulse response Corresponding to the phase information of at least one path, and report the phase information of the at least one path to the network device. In this way, based on the partial disparity of the channel, the network equipment can determine the precoding matrix used for downlink transmission by combining the phase information of at least one path of the downlink channel reported by the terminal device on the premise that the uplink channel impulse response is known. Therefore, the downlink transmission throughput can be improved by optimizing the downlink precoding design.

Fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present invention. The network device includes: a receiving module 41, a measuring module 42, and a determining module 43, wherein:

The receiving module 41 is configured to receive the phase information of at least one path from the terminal device, at least one path is the path corresponding to the downlink channel, the phase information is determined by the terminal device according to the impulse response of the downlink channel, and the impulse response is determined by the terminal device according to the impulse response of the downlink channel. The CSI-RS issued by the network device is determined and obtained;

The measurement module 42 is configured to determine the impulse response of the uplink channel according to the sounding reference signal SRS from the terminal equipment;

The determining module 43 is configured to determine a precoding matrix for downlink transmission according to the phase information and the impulse response of the uplink channel.

Optionally, the determining module 43 is configured to:

Determine the impulse response of the downlink channel according to the phase information and the impulse response of the uplink channel;

Determine the precoding matrix according to the impulse response of the downlink channel;

Wherein, the delay and amplitude of each path in at least one path of the impulse response of the downlink channel are equal to the delay and amplitude of each path in the at least one path of the impulse response of the uplink channel, and the phase information is that of the downlink channel. Phase information of at least one path in the impulse response.

The network device provided by the embodiment of the present invention can implement each process implemented by the network device in the method embodiment in FIG. 2, and in order to avoid repetition, details are not described herein again. In the embodiment of the present invention, based on the partial disparity between the uplink channel and the downlink channel in the FDD system, the terminal device can determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, and then determine at least one corresponding to the downlink channel The phase information of the path, and the phase information of at least one path is reported to the network device. In this way, after the network device receives the phase information from the terminal device, it can be based on the partial disparity of the channel to determine the impulse response of the upstream channel. Under the premise, the phase information of at least one path of the downlink channel reported by the terminal device can be combined to determine the precoding matrix used for downlink transmission, so that the downlink transmission throughput can be improved by optimizing the downlink precoding design.

An embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored on the memory and running on the processor. When the computer program is executed by the processor, any of the information reporting methods described above is implemented. Steps of an embodiment.

Fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device 500 shown in FIG. 5 includes: at least one processor 501, a memory 502, at least one network interface 504, and a user interface 503. The various components in the mobile terminal 500 are coupled together through the bus system 505. It can be understood that the bus system 505 is used to implement connection and communication between these components. In addition to the data bus, the bus system 505 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clear description, various buses are marked as the bus system 505 in FIG. 5.

The user interface 503 may include a display, a keyboard, a pointing device (for example, a mouse, a trackball), a touch panel or a touch screen, etc.

It can be understood that the memory 502 in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM, DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), Synchronous Link Dynamic Random Access Memory (Synchlink DRAM, SLDRAM) ) And Direct Rambus RAM (DRRAM). The memory 502 of the system and method described in the embodiment of the present invention is intended to include, but is not limited to, these and any other suitable types of memory.

In some embodiments, the memory 502 stores the following elements, executable modules or data structures, or their subsets, or their extended sets: operating system 5021 and application programs 5022.

The operating system 5021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application program 5022 includes various application programs, such as a media player (MediaPlayer), a browser (Browser), etc., which are used to implement various application services. The program for implementing the method of the embodiment of the present invention may be included in the application program 5022.

In the embodiment of the present invention, the terminal device 500 further includes: a computer program stored in the memory 502 and capable of running on the processor 501. When the computer program is executed by the processor 501, the following steps are implemented:

The method disclosed in the foregoing embodiment of the present invention may be applied to the processor 501 or implemented by the processor 501. The processor 501 may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 501 or instructions in the form of software. The aforementioned processor 501 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly embodied as being executed and completed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a computer-readable storage medium that is mature in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers. The computer-readable storage medium is located in the memory 502, and the processor 501 reads the information in the memory 502, and completes the steps of the foregoing method in combination with its hardware. Specifically, a computer program is stored on the computer-readable storage medium, and when the computer program is executed by the processor 501, each step of the above-mentioned information reporting method embodiment is implemented.

It can be understood that the embodiments described in the embodiments of the present invention may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (Digital Signal Processing, DSP), digital signal processing devices (DSPDevice, DSPD), programmable logic Device (Programmable Logic Device, PLD), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), general-purpose processors, controllers, microcontrollers, microprocessors, and other electronics used to perform the functions described in the present invention Unit or its combination.

For software implementation, the technology described in the embodiments of the present invention can be implemented by modules (for example, procedures, functions, etc.) that execute the functions described in the embodiments of the present invention. The software codes can be stored in the memory and executed by the processor. The memory can be implemented in the processor or external to the processor.

Optionally, the following steps may also be implemented when the computer program is executed by the processor 501:

At least one path includes paths corresponding to multiple antenna port pairs;

According to the impulse response, determine the phase information of at least one path corresponding to the downlink channel, including:

Wherein, reporting the phase information of at least one path to the network device includes:

Report the phase information of at least one target path to the network device.

Select at least one target path from the paths corresponding to the antenna port pair, including at least one of the following:

Select a set number of paths from the paths corresponding to the antenna port pair, and set the number as a protocol value or pre-configured by the network device;

At least one path whose strength is greater than or equal to a set threshold is selected from the paths corresponding to the antenna port pair, the set threshold is an absolute threshold or a relative threshold, and the set threshold is a protocol value or pre-configured by a network device.

The phase information includes at least one of phase and phase difference.

According to the impulse response component of at least one target path, determining the phase information of at least one target path includes:

If the phase information includes phase difference, then:

Taking one of the at least one target path as a reference path, and determining the phase difference between the reference path and the remaining paths of the at least one target path according to the impulse response component of the at least one target path.

After determining the phase information of the at least one target path according to the impulse response component of the at least one target path, the method further includes:

If the number of at least one target path is greater than 1, then arrange the multiple target paths in the order of monotonically increasing or monotonically decreasing intensity to obtain a path list of multiple target paths;

The phase information is arranged in the order of the corresponding target path in the path list to obtain a phase list of the phase information.

Report the phase information of at least one path to the network device, including:

Quantizing the phase information of at least one path, where the phase information of one path is quantized to obtain at least one bit;

Report the quantized phase information of at least one path to the network device.

If the number of at least one path is greater than 1, then:

The number of bits obtained after quantization of the phase information of different paths is the same; or,

The number of bits obtained after quantization of the phase information of different paths is different. The number of bits obtained after the quantization of the phase information of the first path is greater than the number of bits obtained after the quantization of the phase information of the second path, and the intensity of the first path is greater than the second path. The strength of the path.

Reporting the quantized phase information of at least one path to the network device includes:

Send channel state information CSI for downlink transmission to the network device, where the CSI includes the quantized phase information of at least one path.

Based on at least one of periodicity, aperiodic and semi-persistent, the quantized phase information of at least one path is reported to the network device.

Report the quantized phase information of at least one path to the network device, including:

Based on at least one of the physical uplink control channel PUCCH and the physical uplink shared channel PUSCH, the quantized phase information of at least one path is reported to the network device.

The terminal device 500 can implement various processes implemented by the terminal device in the foregoing embodiments, and in order to avoid repetition, details are not described herein again.

In the embodiment of the present invention, based on the partial disparity between the uplink channel and the downlink channel in the FDD system, the terminal device can determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, and determine the downlink channel based on the impulse response Corresponding to the phase information of at least one path, and report the phase information of the at least one path to the network device. In this way, based on the partial disparity of the channel, the network equipment can determine the precoding matrix used for downlink transmission by combining the phase information of at least one path of the downlink channel reported by the terminal device on the premise that the uplink channel impulse response is known. Therefore, the downlink transmission throughput can be improved by optimizing the downlink precoding design.

The sixth aspect of the present invention provides a network device, including a processor, a memory, and a computer program stored on the memory and running on the processor. The computer program is executed by the processor to implement the information sending method described above. Steps of any embodiment.

Please refer to FIG. 6. FIG. 6 is a structural diagram of a network device applied in an embodiment of the present invention. As shown in FIG. 6, the network device 600 includes: a processor 601, a transceiver 602, a memory 603, a user interface 604, and a bus interface. :

In the embodiment of the present invention, the network device 600 further includes: a computer program stored in the memory 603 and capable of running on the processor 601, and the computer program is executed by the processor 601 to implement the following steps:

In FIG. 6, the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 601 and various circuits of the memory represented by the memory 603 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits. These are all known in the art, and therefore, no further description will be given here. The bus interface provides the interface. The transceiver 602 may be a plurality of elements, including a transmitter and a receiver, and provide a unit for communicating with various other devices on the transmission medium. For different user equipment, the user interface 604 may also be an interface capable of connecting externally and internally with the required equipment. The connected equipment includes but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 601 is responsible for managing the bus architecture and general processing, and the memory 603 can store data used by the processor 2601 when performing operations.

Optionally, the following steps may also be implemented when the computer program is executed by the processor 603:

Determining a precoding matrix according to the impulse response of the downlink channel;

Wherein, the delay and amplitude of each path in at least one path of the impulse response of the downlink channel are equal to the delay and amplitude of each path in the at least one path of the impulse response of the uplink channel, and The phase information is phase information of at least one path in the impulse response of the downlink channel.

The embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, each process of the above-mentioned information reporting method or information sending method embodiment is realized, and can be To achieve the same technical effect, in order to avoid repetition, I will not repeat them here. Wherein, the computer-readable storage medium, such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk, or optical disk, etc.

It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, It also includes other elements not explicitly listed, or elements inherent to the process, method, article, or device. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article, or device that includes the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better.的实施方式。 Based on this understanding, the technical solution of the present invention essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The optical disc) includes a number of instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the method described in each embodiment of the present invention.

The various aspects of the present invention are described above with reference to the flowcharts and/or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present invention. It should be understood that each block in the flowcharts and/or block diagrams and combinations of blocks in the flowcharts and/or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine that enables the execution of these instructions via the processor of the computer or other programmable data processing device Implementation of the functions/actions specified in one or more blocks of the flowcharts and/or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic array. It can also be understood that each block in the block diagram and/or flowchart and the combination of the blocks in the block diagram and/or flowchart can also be implemented by dedicated hardware that performs specified functions or actions, or can be implemented by dedicated hardware and A combination of computer instructions.

The embodiments of the present invention are described above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art are Under the enlightenment of the present invention, many forms can be made without departing from the purpose of the present invention and the scope of protection of the claims, all of which fall within the protection of the present invention.

Claims

An information reporting method applied to terminal equipment, characterized in that it includes:

Determine the impulse response of the downlink channel according to the channel state information reference signal CSI-RS issued by the network device;

Determining the phase information of at least one path corresponding to the downlink channel according to the impulse response;

Reporting the phase information of the at least one path to the network device, where the phase information is used by the network device to determine a precoding matrix for downlink transmission.
The method of claim 1, wherein:

The at least one path includes paths corresponding to multiple antenna port pairs;

Wherein, one antenna port pair includes one transmitting port of the network device and one receiving antenna of the terminal device.
The method according to claim 2, wherein determining the phase information of at least one path corresponding to the downlink channel according to the impulse response comprises:

At least one target path is selected from the path corresponding to the antenna port pair according to the impulse response corresponding to one antenna port in the plurality of antenna port pairs, and the strength of the at least one target path is greater than that of the antenna port pair The intensity of the corresponding remaining paths;

Determining the phase information of the at least one target path according to the impulse response component of the at least one target path;

Wherein, reporting the phase information of the at least one path to the network device includes:

Reporting the phase information of the at least one target path to the network device.
The method according to claim 3, wherein selecting at least one target path from the paths corresponding to the antenna port pair includes at least one of the following:

Selecting a set number of paths from the paths corresponding to the antenna port pair, where the set number is a protocol value or is pre-configured by the network device;

At least one path whose strength is greater than or equal to a set threshold is selected from the paths corresponding to the antenna port pair, the set threshold is an absolute threshold or a relative threshold, and the set threshold is a protocol value or pre-set by the network device. Configured.
The method of claim 3, wherein:

The phase information includes at least one of phase and phase difference.
The method according to claim 5, wherein determining the phase information of the at least one target path according to the impulse response component of the at least one target path comprises:

If the phase information includes a phase difference, then:

Taking one of the at least one target path as a reference path, and determining a phase difference between the reference path and the remaining paths of the at least one target path according to the impulse response component of the at least one target path.
The method according to claim 3, wherein after determining the phase information of the at least one target path according to the impulse response component of the at least one target path, the method further comprises:

If the number of the at least one target path is greater than 1, arrange the multiple target paths in a monotonically increasing or monotonically decreasing order to obtain a path list of the multiple target paths;

Arranging the phase information according to the sequence of the corresponding target paths in the path list to obtain a phase list of the phase information.
The method according to claim 1, wherein reporting the phase information of the at least one path to the network device comprises:

Quantizing the phase information of the at least one path, where the phase information of one path is quantized to obtain at least one bit;

Reporting the quantized phase information of the at least one path to the network device.
The method according to claim 8, wherein if the number of the at least one path is greater than 1, then:

The number of bits obtained after quantization of the phase information of different paths is the same; or,

The number of bits obtained after quantization of the phase information of different paths is different. The number of bits obtained after the quantization of the phase information of the first path is greater than the number of bits obtained after the quantization of the phase information of the second path, and the intensity of the first path is greater than The strength of the second path.
The method according to claim 8, wherein reporting the quantized phase information of the at least one path to a network device comprises:

Sending channel state information CSI for downlink transmission to the network device, where the CSI includes quantized phase information of the at least one path.
The method according to claim 8, wherein reporting the quantized phase information of the at least one path to the network device comprises:

Reporting the quantized phase information of the at least one path to the network device based on at least one of periodic, aperiodic and semi-persistent.
The method according to claim 8, wherein reporting the quantized phase information of the at least one path to the network device comprises:

Reporting the quantized phase information of the at least one path to the network device based on at least one of the physical uplink control channel PUCCH and the physical uplink shared channel PUSCH.
An information sending method applied to network equipment, characterized in that it includes:

Receiving phase information of at least one path from a terminal device, where the at least one path is a path corresponding to a downlink channel, the phase information is determined by the terminal device according to the impulse response of the downlink channel, and the impulse response Determined by the terminal device according to the CSI-RS issued by the network device;

Determine the impulse response of the uplink channel according to the sounding reference signal SRS from the terminal device;

Determine a precoding matrix for downlink transmission according to the phase information and the impulse response of the uplink channel.
The method according to claim 13, wherein determining a precoding matrix according to the phase information and the impulse response of the uplink channel comprises:

Determine the impulse response of the downlink channel according to the phase information and the impulse response of the uplink channel;

Determine the precoding matrix according to the impulse response of the downlink channel;

Wherein, the delay and amplitude of each path in at least one path of the impulse response of the downlink channel are equal to the delay and amplitude of each path in the at least one path of the impulse response of the uplink channel, and The phase information is phase information of at least one path in the impulse response of the downlink channel.
A terminal device, characterized in that it comprises:

The measurement module is used to determine the impulse response of the downlink channel according to the channel state information reference signal CSI-RS issued by the network device;

A determining module, configured to determine phase information of at least one path corresponding to the downlink channel according to the impulse response;

The sending module is configured to report the phase information of the at least one path to the network device, and the phase information is used by the network device to determine a precoding matrix for downlink transmission.
A network device, characterized in that it comprises:

The receiving module is configured to receive phase information of at least one path from a terminal device, where the at least one path is a path corresponding to a downlink channel, and the phase information is determined by the terminal device according to the impulse response of the downlink channel, The impulse response is determined and obtained by the terminal device according to the CSI-RS issued by the network device;

The measurement module is used to determine the impulse response of the uplink channel according to the sounding reference signal SRS from the terminal equipment;

The determining module is configured to determine a precoding matrix for downlink transmission according to the phase information and the impulse response of the uplink channel.
A terminal device, characterized by comprising: a memory, a processor, and a computer program stored on the memory and capable of running on the processor, and when the computer program is executed by the processor, the implementation is as claimed in the claims The steps of the method described in any one of 1 to 12.
A network device, characterized by comprising: a memory, a processor, and a computer program stored on the memory and capable of running on the processor, the computer program being executed by the processor realizes the following Steps of the method of any one of 13 to 14.
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method according to any one of claims 1 to 12 is implemented. Step, or the step of implementing the method according to any one of claims 13 to 14.
A computer program product, wherein the computer program product is stored in a non-volatile storage medium, and the program product is executed by at least one processor to realize the information according to any one of claims 1 to 12 The steps of the reporting method, or the program product is executed by at least one processor to implement the steps of the information sending method according to any one of claims 13 to 14.
A terminal device, which is used to implement the information reporting method according to any one of claims 1 to 12.
A network device for executing the information sending method according to any one of claims 13 to 14.