CN112491451B

CN112491451B - Information reporting and sending method, terminal equipment and network equipment

Info

Publication number: CN112491451B
Application number: CN201910866032.2A
Authority: CN
Inventors: 郤伟; 孙鹏
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2022-02-08
Anticipated expiration: 2039-09-12
Also published as: CN112491451A; WO2021047594A1

Abstract

The invention discloses an information reporting and sending method, a terminal device and a network device, wherein the information reporting method is applied to the terminal device and comprises the following steps: determining impulse response of a downlink channel according to a channel state information reference signal (CSI-RS) issued by network equipment; determining phase information of at least one path corresponding to a downlink channel according to the impulse response; and reporting the phase information of at least one path to the network equipment, wherein the phase information is used for the network equipment to determine a precoding matrix of downlink transmission. In this way, the network device may determine to obtain a precoding matrix 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 of knowing the impulse response of the uplink channel based on the partial reciprocity of the channels, so that the throughput of downlink transmission may be improved by optimizing the downlink precoding design.

Description

Information reporting and sending method, terminal equipment and network equipment

Technical Field

The present invention relates to the field of communications, and in particular, to an information reporting and sending method, a terminal device, and a network device.

Background

Generally, when the terminal device communicates with the network device, Channel State Information (CSI) of a downlink Channel may be fed back to the network device, so that the network device may determine a 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, thereby obtaining better link performance.

With the development of Multi-antenna technology (MIMO), terminal devices and network devices increasingly communicate based on the Multi-antenna technology. When communicating based on the multi-antenna technology, the terminal device also needs to feed back CSI to the network device. In order to reduce resource overhead when the terminal device feeds back CSI to the network device under MIMO, the terminal device usually feeds back CSI to the network device in an implicit feedback manner. For example, the terminal device may send a Sounding Reference Signal (SRS) to the network device, and the network device may determine uplink channel information based on the SRS, determine downlink channel information by using a mutual difference between an uplink channel and a downlink channel, and further determine a precoding matrix for downlink transmission.

In general, channel reciprocity exists in a Time Division Duplex (TDD) system and a Frequency Division Duplex (FDD) system, however, in the FDD system, the reciprocity is only partial channel reciprocity (AoD) in which the Departure Angle (Angle of deviation) of the downlink channel is equal to the Arrival Angle (AoA) of the uplink channel in the Angle domain, and in the delay domain, the uplink and downlink channels have the same multipath delay and multipath power. However, in the FDD system, the uplink and downlink channels are located at different carrier frequencies, so that the wavelengths corresponding to uplink and downlink wireless transmission are different. This results in that in an FDD system, the network device cannot effectively determine the precoding matrix for downlink transmission based on channel reciprocity.

Disclosure of Invention

Embodiments of the present invention provide an information reporting and sending method, a terminal device, and a network device, so as to solve a problem that, in an FDD system, the network device cannot effectively determine a precoding matrix for downlink transmission based on channel reciprocity.

In order to solve the technical problem, the invention is realized as follows:

in a first aspect, an information reporting method is provided, including:

determining impulse response of a downlink channel according to a channel state information reference signal (CSI-RS) issued by network equipment;

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

and reporting the phase information of the at least one path to the network equipment, wherein the phase information is used for the network equipment to determine a precoding matrix of downlink transmission.

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

receiving phase information of at least one path from a terminal device, wherein the at least one path is a path corresponding to a downlink channel, the phase information is determined by the terminal device according to an impulse response of the downlink channel, and the impulse response is determined by the terminal device according to a CSI-RS (channel state information-reference signal) issued by the network device;

determining the impulse response of an uplink channel according to a Sounding Reference Signal (SRS) from the terminal equipment;

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

In a third aspect, a terminal device is provided, which includes:

the measurement module is used for determining the impulse response of a downlink channel according to a channel state information reference signal (CSI-RS) issued by network equipment;

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

and the sending module is used for reporting the phase information of the at least one path to the network equipment, wherein the phase information is used for the network equipment to determine a precoding matrix of downlink transmission.

In a fourth aspect, a network device is provided, the network device comprising:

the receiving module is used for receiving phase information of at least one path from terminal equipment, wherein the at least one path is a path corresponding to a downlink channel, the phase information is determined by the terminal equipment according to an impulse response of the downlink channel, and the impulse response is determined by the terminal equipment according to a CSI-RS (channel state information-reference signal) issued by the network equipment;

the measurement module is used for determining the impulse response of an uplink channel according to a Sounding Reference Signal (SRS) from the terminal equipment;

and the determining module is used for determining a precoding matrix of 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 comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to the first aspect.

In a sixth aspect, a network device is provided, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method according to the second aspect.

In a seventh aspect, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium has stored thereon a computer program, which when executed by a processor implements the steps of the method according to the first aspect.

In an eighth aspect, a computer-readable storage medium is provided, wherein a computer program is stored on the computer-readable storage medium, which computer program, when executed by a processor, performs the steps of the method according to the second aspect.

In the embodiment of the present invention, based on the partial reciprocity between the uplink channel and the downlink channel in the FDD system, the terminal device may determine an impulse response of the downlink channel based on the CSI-RS issued by the network device, determine phase information of at least one path corresponding to the downlink channel according to the impulse response, and report the phase information of the at least one path to the network device. In this way, the network device may determine to obtain a precoding matrix 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 of knowing the impulse response of the uplink channel based on the partial reciprocity of the channels, so that the throughput of downlink transmission may be improved by optimizing the downlink precoding design.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic flow chart of an information reporting method according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating an information sending method according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a network device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed Description

Generally, when a terminal device and a network device communicate based on a multi-antenna technology, the terminal device may feed back CSI to the network device based on the mutual difference between uplink and downlink channels, so that the network device determines a precoding matrix for downlink transmission. Specifically, the terminal device may send a Sounding Reference Signal (SRS) to the network device, and the network device may determine uplink channel information based on the SRS, determine downlink channel information by using a mutual difference between the uplink channel and the downlink channel, and further determine a precoding matrix for downlink transmission.

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

In an actual FDD system, it is found through research that in a time delay domain, for any path, the distance of uplink and downlink transmission is the same, but the wavelength is different, so the phase of the path in the impulse response of the uplink and downlink channels is different. Thus, if the network device knows the phase information of the path corresponding to the downlink channel, the network device may determine to obtain the precoding matrix of the downlink transmission based on the phase information and the partial dissimilarity between the uplink channel and the downlink channel.

In view of this, embodiments of the present invention provide an information reporting and sending method, a terminal device, and a network device, where the terminal device may determine an impulse response of a downlink channel based on a CSI-RS issued by the network device based on partial dissimilarity between an uplink channel and a downlink channel in an FDD system, determine phase information of at least one path corresponding to the downlink channel according to the impulse response, and report the phase information of the at least one path to the network device. In this way, the network device may determine to obtain a precoding matrix 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 of knowing the impulse response of the uplink channel based on the partial reciprocity of the channels, so that the throughput of downlink transmission may 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention can be applied to various communication systems, such as: long Term Evolution (LTE), Long Term Evolution enhanced Long Term Evolution (LTE-a), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS) or Worldwide Interoperability for Microwave access (WiMAX), 5G, or New Radio (NR) systems, etc.

The Terminal device may be understood as a User Equipment (UE), which may also be referred to as a Mobile Terminal (Mobile Terminal), a Mobile User Equipment (ms), or the like, and may communicate with one or more core networks via a Radio Access Network (RAN, for example), and the Terminal device may be a Mobile Terminal, such as a Mobile phone (or a "cellular" phone) and a computer having the Mobile Terminal, such as a portable, pocket, handheld, computer-embedded or vehicle-mounted Mobile device, or an airborne device, such as an unmanned aerial vehicle, an aircraft, or the like, and may exchange language and/or data with the Radio Access Network.

The network device may be understood as a core network, or may also be understood as a Base Station, where the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, an evolved Node B (eNB or e-NodeB) and a 5G Base Station (gNB) in LTE, and a network side device in a subsequent evolved communication system.

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

Fig. 1 is a flowchart illustrating an information reporting method according to an embodiment of the present invention, where the method is applied to a terminal device, and specifically includes the following steps.

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

In a Frequency Division Duplex (FDD) system, in a scenario where a terminal device and a network device communicate based on a Multi-antenna technology (MIMO), before the network device sends downlink data to the terminal device, the network device may pre-configure a Channel State Information Reference signal (CSI-RS) and send the CSI-RS to the terminal device.

After receiving the CSI-RS sent by the network device, the terminal device may estimate an impulse response of the downlink Channel according to CSI-RS measurement, so that Channel State Information (CSI) of the downlink Channel may be fed back to the network device in a subsequent implicit feedback manner.

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), and it is assumed that the number of ports of the network device is N_tThe number of receiving antennas of the terminal equipment is N_rThat is, N can be obtained by combination between the terminal device and the network device_r×N_tA pair of antenna ports, if the impulse response of the downlink channel includes P paths, then the antenna port corresponds to the pair of antenna ports (n)_r,n_t) The impulse response component of the p-th path of (2) may be expressed as:

wherein the content of the first and second substances,

is a complex number comprising a real part and an imaginary part, n_r＝1,2,…,N_r，n_t＝1,2,…,N_t，p＝1,2,…,P。

S104: and determining 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 phase information of at least one path corresponding to the downlink channel.

In this embodiment, at least one path corresponding to the downlink channel may include paths corresponding to the above-mentioned multiple antenna port pairs, where one path corresponding to one antenna port pair may be one or multiple paths. The paths corresponding to the plurality of antenna port pairs may share phase information (that is, the paths corresponding to the plurality of antenna port pairs have the same phase information), or may not share phase information (that is, the paths corresponding to the plurality of antenna port pairs have different phase information).

When determining the phase information of at least one path corresponding to the downlink channel according to the impulse response of the downlink channel, the terminal device may specifically include the following steps, taking one antenna port pair (for convenience of distinction, the following may be represented by a target antenna port pair) as an example:

firstly, according to the impulse response corresponding to one antenna port pair in a plurality of antenna port pairs, at least one target path is selected from paths corresponding to the antenna port pair, wherein the strength of the at least one target path is greater than the strengths of the other paths corresponding to the target antenna port pair.

In this embodiment, at least one target path may be represented as

Wherein n is_r＝1,2,…,N_r，n_t＝1,2,…,N_t. When at least one target path is selected from the paths corresponding to the target antenna port pair, at least two methods can be included:

the first method comprises the following steps:

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 the other paths corresponding to the target antenna port pair. Wherein, the number of the setting pieces is a protocol value or is obtained by the pre-configuration of the network equipment.

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

Number of strips of

Wherein N is the set number described above.

The second method comprises the following steps:

and selecting at least one path with the strength greater than or equal to a set threshold from the paths corresponding to the antenna port pair, and taking the selected at least one path as a target path. Wherein, the threshold is set as a protocol value or is obtained by network equipment in advance.

In an implementation manner, the set threshold may be an absolute threshold, and when the terminal device selects the target path, at least one path having a strength greater than or equal to the absolute threshold may be directly selected from the paths corresponding to the target antenna port pair as the target path.

The impulse response component of the path corresponding to the target antenna port is set as described in S102

For example, the terminal device selects at least one of the obtained values according to the absolute thresholdOne target path may be represented as:

T₁is an absolute threshold.

In another implementation, the set threshold may also be a threshold relative to a reference value, where the reference value may preferably be a strength value of the target antenna port to the corresponding strongest path. In this way, when the terminal device selects at least one target path, at least one path with the strength greater than or equal to the relative threshold may be selected as the target path from the paths corresponding to the target antenna port pair.

Also in the above

For example, assuming that the relative threshold is the threshold relative to the strongest path, the impulse response component of the strongest path is represented as

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

or the like, or, alternatively,

wherein, T₂And T₃Is a relative threshold.

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

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

If the phase information includes the respective phase of the at least one target path, the respective phase of the at least one target path may be obtained by calculation directly according to the respective impulse response component of the at least one target path when the phase information of the at least one target path is determined.

If the phase information includes a phase difference between at least one target path, when the phase information of at least one target path is determined, one of the target paths may be used as a reference path, and the phase difference between the reference path and the remaining paths may be determined according to the impulse response component of the reference path and the impulse response components of the remaining paths in the target paths. Preferably, the reference path may be one of the target paths having the strongest strength.

At least one target path is

For example, assume the reference path is

Medium strongest path

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

or the like, or, alternatively,

wherein ang is a complex auxiliary angle operation.

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 number of phase information to be subsequently reported to the network device may be reduced, thereby reducing consumption of uplink resources. Optionally, in a case that uplink resource consumption is not considered, when determining the phase information of the path corresponding to the antenna port pair, the terminal device may determine the phase information of each path corresponding to the antenna port pair without distinguishing the strong path from the weak path. The determination of the phase information of at least one target path may be exemplified herein.

Optionally, after determining and obtaining the phase information of at least one target path corresponding to one antenna pair based on the method described above, if the number of target paths is greater than 1, the terminal device may further arrange the plurality of target paths in an order of monotonically increasing intensity or monotonically decreasing intensity to obtain a path list corresponding to the plurality of paths, and arrange the phase information of the plurality of target paths in an order of arranging the corresponding target paths in the path list to obtain a phase list corresponding to the phase information of the plurality of target paths.

That is to say, a plurality of target paths included in the path list are ordered, and the phase information included in the phase list is also ordered, so that after the phase information is reported to the network device subsequently, the network device can determine which phase information in the phase list corresponds to which entry label path according to the ordering of the path list and the phase list. If the phase information in the phase list is a phase difference, the number of elements in the phase list is 1 less than the number of elements in the path list.

In this embodiment, after determining phase information of a path corresponding to one antenna port, if multiple antenna ports have the same phase information for corresponding paths, the terminal device may use the phase information of the path corresponding to the antenna port as phase information of paths corresponding to other antenna ports, so as to obtain a path list and a phase list; if the paths corresponding to the multiple antenna port pairs have different phase information, the phase information of the paths corresponding to other target antenna ports can be determined based on the same method, and then multiple path lists and multiple phase lists are obtained, wherein one antenna port pair corresponds to one path list and one phase list.

S106: and reporting the phase information of the at least one path to the network equipment, wherein the phase information is used for the network equipment to determine a precoding matrix of downlink transmission.

In S106, after determining the phase information of at least one path corresponding to the downlink channel based on the method described in S104, the terminal device may report the phase information to the network device, so that the network device may determine a precoding matrix for downlink data transmission based on the phase information.

Preferably, if the terminal device determines that the obtained phase information of the at least one target path is described above, the phase information of the at least one target path may be reported to the network device. When the terminal device reports the phase information of at least one target path to the network device, the terminal device may report the recorded phase list to the network device, so that the network device may determine which phase information in the phase list corresponds to which path of the downlink channel based on the order of the phase list. The following may be described by reporting phase information of at least one target path by the terminal device.

In this embodiment, before reporting the phase list to the network device, the terminal device may further quantize the phase information of at least one path in the phase list, so as to report the quantized phase information to the network device, where the quantized phase information of one path obtains at least one bit.

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 quantization of the phase information of different paths may be the same, that is, the phase information of each path is quantized to a fixed number of bits, where the fixed number of bits may be a protocol value, or may be preconfigured by the network device.

It should be noted that, if multiple antenna port pairs between the terminal device and the network device have the same phase information for corresponding paths, that is, multiple antenna port pairs correspond to one path list and one phase list, assuming that the phase list is represented by Φ, and Φ includes | Φ | elements, then the total number of phase information to be quantized is | Φ |, the number of bits after quantization is mx |, M is the number of bits obtained after quantization of each phase information, and | | is an operator for taking the number of elements in the list.

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

It is shown that,

comprises

Individual elements, then, the total number of phase information to be quantized is

The number of bits after quantization is

M is the number of bits obtained by 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 the quantization of the phase information of different paths may also be different, where 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 strength of the first path is greater than the strength of the second path. That is, the phase information of the paths with different strengths is quantized with different accuracies, and the stronger the strength of the path is, the more bits the phase information of the path is quantized to.

It should be noted that, no matter whether multiple antenna ports between the terminal device and the network device have the same phase information for corresponding paths, when quantizing the phase information of different paths to obtain quantization results with different bit numbers, the corresponding bit numbers can be obtained by quantization according to the strength of the paths, which is not described in detail herein.

After quantizing the phase Information of the multiple paths, the terminal device may report the quantized phase Information to the network device separately, or may report the quantized phase Information to the network device while carrying the quantized phase Information in Channel State Information (CSI), which is not limited specifically herein.

In addition, when reporting the quantized phase information to the network device, the reporting mode may be at least one of periodic reporting, aperiodic reporting, and semi-persistent reporting, and the used Channel may be at least one of a Physical Uplink Control Channel (PUCCH) and a Physical Uplink Shared Channel (PUSCH), which is not specifically limited herein.

After the terminal device reports the quantized phase information of the at least one path to the network device, the network device may determine a precoding matrix for downlink transmission based on the phase information, and a specific implementation manner may refer to the content described in the embodiment shown in fig. 2, which is not described repeatedly herein.

Fig. 2 is a flowchart illustrating an information sending method according to an embodiment of the present invention, where the information sending method is applied to a network device, and specifically includes the following steps.

S202: receiving phase information of at least one path from a terminal device, wherein the at least one path is a path corresponding to a downlink channel, the phase information is determined by the terminal device according to an impulse response of the downlink channel, and the impulse response is determined by the terminal device according to a CSI-RS (channel state information-reference signal) issued by the network device.

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

After receiving the CSI-RS, the terminal device may determine an impulse response of the downlink channel according to the CSI-RS based on the method described in the embodiment shown in fig. 1, determine phase information of at least one path corresponding to the downlink channel according to the impulse response, and send the phase information to the network device, where the network device may receive the phase information from the terminal device.

S204: and determining the impulse response of an uplink channel according to the Sounding Reference Signal (SRS) from the terminal equipment.

In S204, the network device may measure the impulse response of the uplink channel according to a 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. Assume that the number of ports of a network device is N_tThe number of receiving antennas of the terminal equipment is N_rThat is, N can be obtained by combination between the terminal device and the network device_r×N_tA pair of antenna ports, if the impulse response of the uplink channel includes P paths, then the antenna port corresponds to the pair of antenna ports (n)_r,n_t) The impulse response component of the p-th path of (2) may be expressed as:

wherein the content of the first and second substances,

is a complex number comprising a real part and an imaginary part, n_r＝1,2,…,N_r，n_t＝1,2,…,N_t，p＝1,2,…,P，

As described in the embodiment of FIG. 1

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

S206: and determining a precoding matrix of 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 reciprocity of the uplink and downlink channels, 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 corresponding to at least one path of the impulse response of the uplink channel, and therefore, under the condition that the phase information of at least one path in the impulse response of the downlink channel is known, the impulse response of the downlink channel can be obtained based on the impulse response of the uplink channel recorded in S204.

The impulse response of the uplink channel is described above

The impulse response of the downlink channel is as described above

For example, the impulse response of the downlink channel may be determined

Wherein the content of the first and second substances,

j is the sign of the imaginary part,

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

is composed of

And forming a phase list.

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

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 a frequency domain response of the downlink channel, where the frequency domain response may be represented as a matrix H_kWherein k is k₁,k₁+1,…,k₂Specifically, it can be understood as subcarrier indexes in a Precoding Resource Group (PRG), and Resource elements in the PRG may share the same Precoding matrix.

Obtaining the frequency domain response H of the downlink channel_kThen, the characteristic value decomposition can be carried out on the autocorrelation matrix of the self-correlation matrix to obtain a characteristic matrix Q,

and obtaining a precoding matrix W, wherein the precoding matrix W is the front r column of the matrix Q, r is a rank, belongs to a part of CSI, and can be fed back to the network equipment by the terminal equipment.

Thus, after obtaining the precoding matrix W, the network device can send downlink data to the terminal device based on the precoding matrix, thereby obtaining better link performance.

In the embodiment of the invention, based on the partial mutual difference of the uplink channel and the downlink channel in the FDD system, the terminal equipment can determine the impulse response of the downlink channel based on the CSI-RS issued by the network equipment, further determine the phase information of at least one path corresponding to the downlink channel, and report the phase information of at least one path to the network equipment.

The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

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

the measurement module 31 determines an impulse response of a downlink channel according to a channel state information reference signal CSI-RS issued by the network device;

a determining module 32, configured to determine 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 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.

Optionally, the at least one path includes a path corresponding to a plurality of antenna port pairs;

wherein one antenna port pair includes one transmission port of the network device and one reception antenna of the terminal device.

Optionally, the determining module 32 determines, according to the impulse response, phase information of at least one path corresponding to the downlink channel, including:

selecting at least one target path from paths corresponding to the antenna port pairs according to impulse responses corresponding to one antenna port pair in the plurality of antenna port pairs, wherein the strength of the at least one target path is greater than the strengths of the rest paths corresponding to the antenna port pairs;

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

the sending module 33 reports the phase information of the at least one path to the network device, and includes:

and reporting the phase information of the at least one target path to the network equipment.

Optionally, the determining module 32 selects at least one target path from the paths corresponding to the antenna port pairs, where the target path includes at least one of:

selecting a set number of paths from the paths corresponding to the antenna port pair, wherein the set number is a protocol value or is obtained by pre-configuration of the network equipment;

selecting at least one path with the strength greater than or equal to a set threshold from the paths corresponding to the antenna port pair, wherein the set threshold is an absolute threshold or a relative threshold, and the set threshold is a protocol value or is obtained by pre-configuration of the network equipment.

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

Optionally, the determining module 32 determines the phase information of the at least one target path according to the impulse response component of the at least one target path, including:

if the phase information comprises a phase difference, then:

and taking one path of the at least one target path as a reference path, and determining phase differences between the reference path and the rest paths of the at least one target path according to the impulse response component of the at least one target path.

Optionally, 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, if the number of the at least one target path is greater than 1, the determining module 32 arranges the plurality of target paths in an order of monotonically increasing intensity or monotonically decreasing intensity to obtain a path list of the plurality of target paths;

and arranging the phase information according to the arrangement sequence of the corresponding target path in the path list to obtain the phase list of the phase information.

Optionally, the sending module 33 is configured to report the phase information of the at least one path to the network device, and includes:

quantizing the phase information of the at least one path, wherein at least one bit is obtained after the phase information of one path is quantized;

and reporting the quantized phase information of the at least one path to the network equipment.

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

the bit numbers obtained after the phase information of different paths is quantized are the same; or the like, or, alternatively,

the bit numbers obtained after the phase information of different paths is quantized are different, wherein the bit number obtained after the phase information of a first path is quantized is larger than the bit number obtained after the phase information of a second path is quantized, and the strength of the first path is larger than that of the second path.

Optionally, the sending module 33 reports the quantized phase information of the at least one path to the network device, and includes:

and sending Channel State Information (CSI) for downlink transmission to the network equipment, wherein the CSI comprises the quantized phase information of the at least one path.

Optionally, the sending module 33 is configured to report the quantized phase information of the at least one path to the network device, and includes:

and reporting the quantized phase information of the at least one path to the network equipment based on at least one of periodicity, non-periodicity and semi-persistence.

Optionally, the sending module 33 reports the quantized phase information of the at least one path to the network device, including,

and reporting the quantized phase information of the at least one path to the network equipment based on at least one of a Physical Uplink Control Channel (PUCCH) and a 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 of fig. 1, and is not described herein again to avoid repetition. In the embodiment of the present invention, based on the partial reciprocity between the uplink channel and the downlink channel in the FDD system, the terminal device may determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, determine the phase information of at least one path corresponding to the downlink channel according to the impulse response, and report the phase information of the at least one path to the network device. In this way, the network device may determine to obtain a precoding matrix 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 of knowing the impulse response of the uplink channel based on the partial reciprocity of the channels, so that the throughput of downlink transmission may 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, where the network device includes: a receiving module 41, a measuring module 42 and a determining module 43, wherein:

a receiving module 41, 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, the phase information is determined by the terminal device according to an impulse response of the downlink channel, and the impulse response is determined by the terminal device according to a CSI-RS issued by the network device;

the measurement module 42 determines an impulse response of an uplink channel according to a sounding reference signal SRS from the terminal device;

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

Optionally, the determining module 43 determines a precoding matrix according to the phase information and the impulse response of the uplink channel, including:

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

determining 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 corresponding to at least one path of the impulse response of the uplink channel, and the phase information is the phase information of at least one path in the impulse response of the downlink channel.

The network device provided in the embodiment of the present invention can implement each process implemented by the network device in the method embodiment of fig. 2, and is not described here again to avoid repetition. In the embodiment of the invention, based on the partial mutual difference of the uplink channel and the downlink channel in the FDD system, the terminal equipment can determine the impulse response of the downlink channel based on the CSI-RS issued by the network equipment, further determine the phase information of at least one path corresponding to the downlink channel, and report the phase information of at least one path to the network equipment.

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, memory 502, at least one network interface 504, and a user interface 503. The various components in the mobile terminal 500 are coupled together by a bus system 505. It is understood that the bus system 505 is used to enable connection communications between these components. The bus system 505 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 505 in FIG. 5.

The user interface 503 may include, among other things, a display, a keyboard, a pointing device (e.g., a mouse, trackball), a touch pad, or a touch screen.

It is to be understood that the memory 502 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (SRAM, Static RAM), Dynamic random access memory (DRAM, Dynamic RAM), Synchronous Dynamic random access memory (SDRAM, Synchronous DRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM, Double Data Rate SDRAM), Enhanced Synchronous DRAM (ESDRAM, Enhanced SDRAM), Synchronous link DRAM (SLDRAM, Synchronous DRAM), and Direct Rambus RAM (DRRAM). The memory 502 of the subject systems and methods described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 502 stores elements, executable modules or data structures, or a subset thereof, or an expanded set thereof as follows: an 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, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application 5022 includes various applications, such as a media player (MediaPlayer), a Browser (Browser), and the like, for implementing various application services. The program for implementing the method according to the embodiment of the present invention may be included in the application program 5022.

In this embodiment of the present invention, the terminal device 500 further includes: a computer program stored on a memory 502 and executable on a processor 501, the computer program when executed by the processor 501 implementing the steps of:

The method disclosed by the above-mentioned embodiments 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 having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 501. The Processor 501 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may reside in ram, flash memory, rom, prom, or eprom, registers, among other computer-readable storage media known in the art. The computer readable storage medium is located in the memory 502, and the processor 501 reads the information in the memory 502 and performs the steps of the above method in combination with the hardware thereof. Specifically, the computer readable storage medium stores a computer program, and the computer program realizes the steps of the above-mentioned information reporting method embodiment when executed by the processor 501.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described in this disclosure may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described in this disclosure. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

Optionally, the computer program may further implement the following steps when executed by the processor 501:

the at least one path comprises a path corresponding to a plurality of antenna port pairs;

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

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

Selecting at least one target path from the paths corresponding to the antenna port pair, wherein the at least one target path comprises at least one of the following:

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

Determining phase information of the at least one target path according to the impulse response component of the at least one target path, including:

if the phase information comprises a phase difference, then:

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 the at least one target path is greater than 1, arranging the target paths according to the order of monotonically increasing intensity or monotonically decreasing intensity to obtain a path list of the target paths;

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

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

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

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

The terminal device 500 can implement the processes implemented by the terminal device in the foregoing embodiments, and in order to avoid repetition, the descriptions are omitted here.

In the embodiment of the present invention, based on the partial reciprocity between the uplink channel and the downlink channel in the FDD system, the terminal device may determine the impulse response of the downlink channel based on the CSI-RS issued by the network device, determine the phase information of at least one path corresponding to the downlink channel according to the impulse response, and report the phase information of the at least one path to the network device. In this way, the network device may determine to obtain a precoding matrix 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 of knowing the impulse response of the uplink channel based on the partial reciprocity of the channels, so that the throughput of downlink transmission may be improved by optimizing the downlink precoding design.

Referring to fig. 6, fig. 6 is a structural diagram of a network device applied in the embodiment of the present invention, and 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, wherein:

in this embodiment of the present invention, the network device 600 further includes: a computer program stored in the memory 603 and executable on the processor 601, the computer program when executed by the processor 601 performing the steps of:

In fig. 6, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 601 and various circuits of memory represented by memory 603 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 602 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 604 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

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

Optionally, the computer program when executed by the processor 603 further performs the following steps:

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

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

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements each process of the information reporting method or the information sending method embodiment, and can achieve the same technical effect, and in order to avoid repetition, the computer program is not described here again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An information reporting method is applied to a terminal device, and is characterized by comprising the following steps:

and reporting the phase information of the at least one path to the network equipment, wherein the phase information is used for the network equipment to determine a precoding matrix of downlink transmission by combining with an impulse response of an uplink channel.

2. The method of claim 1,

3. The method of claim 2, wherein determining the phase information of the at least one path corresponding to the downlink channel according to the impulse response comprises:

4. The method of claim 3, wherein selecting at least one target path from the paths corresponding to the antenna port pairs comprises at least one of:

5. The method of claim 3,

the phase information includes at least one of a phase and a phase difference.

6. The method of claim 5, wherein determining phase information for the at least one target path from an impulse response component of the at least one target path comprises:

if the phase information comprises a phase difference, then:

7. The method of claim 3, wherein after determining the phase information of the at least one target path from the impulse response component of the at least one target path, the method further comprises:

8. The method of claim 1, wherein reporting the phase information of the at least one path to the network device comprises:

9. The method of claim 8, wherein if the number of the at least one path is greater than 1:

10. The method of claim 8, wherein reporting the quantized phase information of the at least one path to a network device comprises:

11. The method of claim 8, wherein reporting the quantized phase information of the at least one path to the network device comprises:

12. The method of claim 8, wherein reporting the quantized phase information of the at least one path to the network device comprises,

13. An information sending method applied to a network device is characterized by comprising the following steps:

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

15. A terminal device, comprising:

and the sending module is used for reporting the phase information of the at least one path to the network equipment, and the phase information is used for determining a precoding matrix of downlink transmission by the network equipment in combination with the impulse response of the uplink channel.

16. A network device, comprising:

17. A terminal device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 12.

18. A network device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 13 to 14.

19. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method according to one of the claims 1 to 12, or carries out the steps of the method according to one of the claims 13 to 14.