CN110875768B

CN110875768B - Feedback method and device of channel state information, network equipment and terminal

Info

Publication number: CN110875768B
Application number: CN201811005200.0A
Authority: CN
Inventors: 李辉; 高秋彬; 苏昕
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-08-30
Filing date: 2018-08-30
Publication date: 2023-05-26
Anticipated expiration: 2038-08-30
Also published as: CN110875768A

Abstract

The application discloses a feedback method and device of channel state information, network equipment and a terminal, wherein the feedback method of the channel state information comprises the following steps: the terminal determines N beams in the combined beam set to form a first beam set in the combined beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer; the terminal determines a weighting coefficient parameter of a weighting coefficient of each wave beam in the first wave beam set in the functional relation and a weighting coefficient of each wave beam in the second wave beam set aiming at each polarization direction of each layer; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; and the terminal feeds back the weighting coefficient parameters and the weighting coefficient of each beam in the second beam set to network equipment.

Description

Feedback method and device of channel state information, network equipment and terminal

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for feeding back channel state information, a network device, and a terminal.

Background

In an NR (New RAT radio access technology, new radio access technology) system, a relatively complex codebook is designed because of the need to support a relatively large number of antenna ports and the need to improve the performance of MU-MIMO (Multi-User Multiple-Input Multiple-Output). Specifically, there are three types of codebooks: type I single panel codebooks, type I multi-panel codebooks and type II single panel codebooks. The quantization precision of the codebook of the type I to the channel is low, and the PMI feedback overhead is low (in the order of tens of bits); the codebook of type II is designed for MU-MIMO, the quantization precision of the channel is high, and the PMI feedback overhead is high (in the order of hundreds of bits).

The codebook of type II is generated based on a beam combining manner, which is generated by weighting L beams with amplitude and phase, and l=2, l=3 or l=4 can be configured.

The terminal calculates channel state information (Channel State Information, CSI) by downlink channel measurements. The CSI includes a channel quality Indication (Channel Quality Indication, CQI), a Rank Indication (RI), and a precoding matrix Indication (Precoding Matrix Indicator, PMI), and may further include channel state information reference signals (also referred to as sounding reference signals) (Channel State Information Reference Signal, CSI-RS) resource Indication CRI information.

The PMI feedback overhead of a 32 port type II codebook is given in fig. 1, which is directly related to the number of beams L for beam combining and Rank value (data stream number). Each PMI feedback overhead consists of two parts, namely a wideband part and a subband part, and a figure is illustrated by taking 1 wideband and 10 subbands as examples, and it can be seen from the figure that for l=2 and l=4, the feedback overhead is approximately 1 time different.

As can be seen, the type II codebook of the prior art has a large overhead for high precision feedback.

Disclosure of Invention

The embodiment of the application provides a feedback method and device of channel state information, network equipment and a terminal, which are used for solving the technical problem of high new feedback overhead of the existing channel state.

The specific technical scheme provided by the embodiment of the application is as follows:

the embodiment of the application provides a feedback method of channel state information, which comprises the following steps:

the terminal determines N beams in the combined beam set to form a first beam set in the combined beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer;

the terminal determines a weighting coefficient parameter of a weighting coefficient of each wave beam in the first wave beam set in the functional relation and a weighting coefficient of each wave beam in the second wave beam set aiming at each polarization direction of each layer; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

And the terminal feeds back the weighting coefficient parameters and the weighting coefficient of each beam in the second beam set to network equipment.

One possible implementation, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters; the terminal feeds back the weighting coefficient parameters to network equipment, and the method comprises the following steps:

and the terminal feeds back the non-fixed weighting coefficient parameters of the first wave beam to the network equipment.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the terminal sending the weighting coefficients to the network device, comprising:

the terminal transmits the non-fixed weighting coefficients of the second beam to the network device.

A possible implementation manner, the method further includes:

the terminal receives the number N of beams in a first beam set configured for the terminal by the network equipment;

or the terminal determines the number N of the beams in the first beam set and feeds back the number N to the network equipment.

A possible implementation manner, the method further includes:

the terminal feeds back indication information of the beams forming the combined beam set to the network equipment;

And/or the terminal feeds back indication information of each wave beam in the first wave beam set to the network equipment;

and/or the terminal feeds back indication information of each beam in the second beam set to the network equipment.

One possible implementation, the functional relationship is predefined; or, the functional relationship is configured for the terminal by the network device.

In a possible implementation manner, the weighting coefficient includes at least one of a wideband phase factor, a wideband amplitude factor, a subband phase factor and a subband amplitude factor.

The embodiment of the application provides a method for receiving channel state information, which comprises the following steps:

the network equipment receives the weighting coefficient parameters of each wave beam in the first wave beam set and the weighting coefficients of each wave beam in the second wave beam set of each polarization direction fed back by the terminal; the first beam set is a beam which is determined by the terminal in the combined beam set and meets a functional relation; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; n is a positive integer;

The network equipment determines the weighting coefficient of each wave beam in the first wave beam set on each sub-band according to the weighting coefficient parameters of the wave beams and the functional relation;

and the network equipment generates a precoding matrix according to the weighting coefficient of each beam in the first beam set and the weighting coefficient of each beam in the second beam set.

A possible implementation manner, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters, and the network device receives the weighting coefficient parameters fed back by the terminal, including:

the network equipment receives non-fixed weighting coefficient parameters fed back by a terminal;

the network device determines the weighting coefficient of the beam on each sub-band according to the weighting coefficient parameter of the beam and the functional relation, and the method comprises the following steps:

the network device determines a weighting coefficient for each beam in the first set of beams on each subband based on the non-fixed weighting coefficient parameters of the first beam, and the predefined fixed weighting coefficient parameters, and the functional relationship.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the network device receives the weighting coefficient of each wave beam in the second wave beam set fed back by the terminal, and the weighting coefficient comprises:

The network equipment receives non-fixed weighting coefficients of a second wave beam in a second wave beam set sent by the terminal;

the network device generates a precoding matrix according to the weighting coefficient of each beam in the first beam set and the weighting coefficient of each beam in the second beam set, and the method comprises the following steps:

the network device generates a precoding matrix from the weighting coefficients of each beam in the first set of beams on each subband, a predefined fixed weighting coefficient, and non-fixed weighting coefficients of the second beam.

In a possible implementation manner, for rank=k, the precoding matrix W is:

coefficients of precoding matrix for the first layer and polarization direction r (l=0, 1, …, K-1, r=0, 1)

The method comprises the following steps:

wherein ,

a weighting coefficient parameter representing a first layer in the first beam set and a beam i having a polarization direction r, G _r,l,i (. Cndot.) represents the functional relationship, f represents frequency; />

A weighting coefficient representing a first layer in the second beam set and a beam m having a polarization direction r; />

i=0, …, N-1 denotes the N beams, k of the first set of beams ₁ (i)k ₂ (i) Beam index for the first dimension and the second dimension of beam i; />

m=n, …, L-1 denotes the beam in the second set of beams, k ₁ (m)k ₂ (m) is a beam index for a first dimension and a second dimension of beam m.

A possible implementation manner, the method further includes:

the network equipment configures the number of beams in the combined beam set for the terminal;

and/or the network equipment configures the number N of the beams in the first beam set for the terminal;

or the network equipment receives the number of beams in the combined beam set fed back by the terminal;

and/or the network equipment receives the feedback of the terminal and determines the number N of the beams in the first beam set.

A possible implementation manner, the method further includes:

the network equipment receives the indication information of the beams forming the combined beam set, which is fed back by the terminal;

and/or the network equipment receives indication information of N beams forming the first beam set, which is fed back by the terminal;

and/or the network equipment receives the indication information of the beams forming the second beam set, which is fed back by the terminal.

The embodiment of the application provides a feedback device of channel state information, which comprises:

a processing unit, configured to determine, in a combined beam set, that N beams in the combined beam set form a first beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer; determining, for each polarization direction of each layer, a weighting coefficient parameter in the functional relationship for a weighting coefficient of each beam in the first set of beams, and a weighting coefficient of each beam in the second set of beams; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

and the receiving and transmitting unit is used for feeding back the weighting coefficient parameters and the weighting coefficient of each beam in the second beam set to the network equipment.

One possible implementation, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters; the transceiver unit is specifically configured to: and feeding back the non-fixed weighting coefficient parameters of the first wave beam to the network equipment.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the transceiver unit is specifically configured to send the non-fixed weighting coefficient of the second beam to the network device.

A possible implementation manner, the transceiver unit is further configured to receive the number N of beams in the first beam set configured by the network device for the terminal;

or the processing unit is further configured to determine the number N of beams in the first beam set, and feed back the number N of beams to the network device through the transceiver unit.

A possible implementation manner, the transceiver unit is further configured to feed back, to a network device, indication information of beams that form the combined beam set;

and/or the transceiver unit is further configured to feed back, to a network device, indication information of each beam in the first beam set;

and/or the transceiver unit is further configured to feed back indication information of each beam in the second beam set to a network device.

the receiving and transmitting unit is used for receiving the weighting coefficient parameters of each wave beam in the first wave beam set and the weighting coefficients of each wave beam in the second wave beam set of each polarization direction fed back by the terminal; the first beam set is a beam which is determined by the terminal in the combined beam set and meets a functional relation; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; n is a positive integer;

the processing unit is used for determining the weighting coefficient of each wave beam in the first wave beam set on each sub-band according to the weighting coefficient parameters of the wave beams and the functional relation; and generating a precoding matrix according to the weighting coefficient of each beam in the first beam set and the weighting coefficient of each beam in the second beam set.

One possible implementation manner, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters, or the weighting coefficient parameters of the first beam in the first beam set are non-fixed weighting coefficient parameters; the receiving and transmitting unit is specifically used for receiving non-fixed weighting coefficient parameters fed back by the terminal;

the processing unit is specifically configured to: and determining the weighting coefficient of each beam in the first beam set on each sub-band according to the non-fixed weighting coefficient parameter, the predefined fixed weighting coefficient parameter of the first beam and the function relation of the weighting coefficient parameter and frequency.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the receiving and transmitting unit is further configured to receive a non-fixed weighting coefficient of a second beam in the second beam set sent by the terminal;

the processing unit is further configured to generate a precoding matrix according to the weighting coefficients of each beam in the first set of beams on each subband, a predefined fixed weighting coefficient, and a non-fixed weighting coefficient of the second beam.

In a possible implementation manner, for rank=k, the precoding matrix W is:

The method comprises the following steps:

wherein ,

A possible implementation manner, the processing unit is further configured to:

configuring the number of beams in the combined beam set for the terminal;

and/or the processing unit is further configured to configure the number N of beams in the first beam set for the terminal;

or the receiving and transmitting unit is further configured to receive the number of beams in the combined beam set fed back by the terminal;

and/or the receiving and transmitting unit is further used for determining the number N of the beams in the first beam set by the terminal for receiving the feedback of the terminal.

A possible implementation manner, the transceiver unit is further configured to:

receiving indication information of beams forming the combined beam set, which is fed back by the terminal;

and/or receiving indication information of N beams forming the first beam set fed back by the terminal;

and/or receiving indication information of the beams forming the second beam set fed back by the terminal.

The embodiment of the application provides a terminal, which comprises: the device comprises a processor, a memory, a transceiver and a bus interface, wherein the processor, the memory and the transceiver are connected through the bus interface;

the processor is used for determining that N beams in the combined beam set form a first beam set in the combined beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer; determining, for each polarization direction of each layer, a weighting coefficient parameter in the functional relationship for a weighting coefficient of each beam in the first set of beams, and a weighting coefficient of each beam in the second set of beams; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

The transceiver is configured to feed back the weighting coefficient parameter and the weighting coefficient of each beam in the second beam set to a network device;

the memory is used for storing one or more executable programs and storing data used by the processor in executing operations;

the bus interface is used for providing an interface.

One possible implementation, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters; the transceiver is specifically configured to: and feeding back the non-fixed weighting coefficient parameters of the first wave beam to the network equipment.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the transceiver is specifically configured to send the non-fixed weighting coefficient of the second beam to the network device.

A possible implementation manner, the transceiver is further configured to receive the number N of beams in the first beam set configured by the network device for the terminal;

or the processor is further configured to determine the number N of beams in the first beam set, and feed back the number N of beams to the network device through the transceiver.

A possible implementation manner, the transceiver is further configured to feed back, to a network device, indication information of beams that constitute the combined beam set;

and/or the transceiver is further configured to feed back, to a network device, indication information that constitutes each beam in the first set of beams;

and/or the transceiver is further configured to feed back to a network device indication information of each beam in the second beam set.

The embodiment of the application provides a network device, which comprises: the device comprises a processor, a memory, a transceiver and a bus interface, wherein the processor, the memory and the transceiver are connected through the bus interface;

the transceiver is used for receiving the weighting coefficient parameters of each wave beam in the first wave beam set and the weighting coefficients of each wave beam in the second wave beam set of each polarization direction of each layer fed back by the terminal; the first beam set is a beam which is determined by the terminal in the combined beam set and meets a functional relation; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; n is a positive integer;

The processor is used for determining the weighting coefficient of each wave beam in the first wave beam set on each sub-band according to the weighting coefficient parameters of the wave beams and the functional relation; generating a precoding matrix according to the weighting coefficient of each beam in the first beam set and the weighting coefficient of each beam in the second beam set;

the bus interface is used for providing an interface.

One possible implementation, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters; the transceiver is specifically configured to receive a non-fixed weighting coefficient parameter fed back by the terminal;

the processor is specifically configured to: determining the weighting coefficients of each beam in the first set of beams on each subband according to the non-fixed weighting coefficient parameters, the predefined fixed weighting coefficient parameters and the functional relationship.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the transceiver is further configured to receive a non-fixed weighting coefficient of a second beam in the second beam set sent by the terminal;

In a possible implementation manner, for rank=k, the precoding matrix W is:

The method comprises the following steps:

wherein ,

a weighting coefficient parameter representing a first layer in the first beam set and a beam i having a polarization direction r, G _r,l,i (. Cndot.) represents theA functional relationship, f represents frequency; />

A possible implementation manner, the processor is further configured to configure the number of beams in the combined beam set for the terminal;

and/or the processor is further configured to configure the number N of beams in the first beam set for the terminal;

Or the transceiver is further configured to receive the number of beams in the combined beam set fed back by the terminal;

and/or the transceiver is further configured to determine the number N of beams in the first beam set by the terminal that is further configured to receive feedback from the terminal.

A possible implementation, the transceiver is further configured to:

In this embodiment of the present invention, a terminal determines, in a combined beam set, a beam satisfying a functional relationship as a beam of a first beam set, and determines, by using the functional relationship and a weight coefficient of each beam in the first beam set of each polarization direction of each layer, a weight coefficient parameter of each beam in the first beam set of each polarization direction of each layer, so that, for each beam in the first beam set, the terminal needs only to feed back the weight coefficient parameter, and does not need to feed back each subband weight coefficient of each beam of each polarization direction of each layer, and can determine, on a network device side, the weight coefficient on each subband of each beam of each polarization direction of each layer by using the functional relationship and the weight coefficient parameter corresponding to the weight coefficient parameter. Therefore, on the premise of the same precision, the feedback overhead of the type II codebook is effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application.

Fig. 1 is a schematic diagram of PMI feedback overhead of a 32 port type II codebook provided in the prior art;

FIG. 2 provides a system architecture diagram according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a dual polarized antenna according to an embodiment of the present application;

fig. 4 is a flow chart of a feedback method of channel state information according to an embodiment of the present application;

fig. 5 is a schematic diagram of a feedback method of channel state information according to an embodiment of the present application;

fig. 6 is a schematic diagram of a feedback method of channel state information according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an apparatus according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of another device according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a circuit system according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of another circuit system according to an embodiment of the present application.

Detailed Description

The embodiment of the application provides a channel state information feedback method and device, network equipment and a terminal, which are used for solving the technical problems that the cost of the existing channel state information feedback method is high and even the system performance is influenced.

In the following, a system operating environment of the present application will be described, where the techniques described herein may be applied to LTE systems, such as LTE/LTE-a/LTE systems, or other wireless communication systems employing various radio access technologies, such as systems employing access technologies such as code division multiple access (code division multiple access, CDMA), frequency division multiple access (frequency division multiple access, FDMA), time division multiple access (time division multiple access, TDMA), orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA), single carrier-frequency division multiple access (single carrier-frequency division multiple access, SC-FDMA), etc., as well as to subsequent evolution systems, such as fifth generation 5G (also referred to as New Radio (NR)) systems, etc., and may be extended to similar wireless communication systems, such as wifi, wimax, and 3gpp related cellular systems.

Fig. 2 presents a schematic view of a communication system. The communication system may include at least one network device 100 (only 1 is shown) and one or more terminals 200 connected to the network device 100.

The network device 100 may be a device capable of communicating with the terminal 200. The network device 100 may be any device having a wireless transceiving function. Including but not limited to: base stations NodeB, evolved base stations eNodeB, base stations in fifth generation (the fifth generation, 5G) communication systems, base stations or base stations in future communication systems, access nodes in WiFi systems, wireless relay nodes, wireless backhaul nodes, etc. The base station 100 may also be a radio controller in the context of a cloud radio access network (cloud radio access Network, CRAN). The base station 100 may also be a base station in a 5G network or a base station in a future evolution network; but also a wearable device or a vehicle-mounted device, etc. The base station 100 may also be a small station, a transmitting node (transmission reference point, TRP), or the like. Of course, this application is not limited thereto.

Terminal 200 is a device with wireless transceiver capability that may be deployed on land, including indoors or outdoors, hand-held, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The terminal may be a mobile phone, a tablet (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart home), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application are not limited to application scenarios. A terminal may also be referred to as a User Equipment (UE), an access terminal, a UE unit, a UE station, a mobile station, a remote terminal, a mobile device, a UE terminal, a wireless communication device, a UE agent, a UE apparatus, or the like.

Multiple-input multiple-output (MIMO) technology transmits multiple data in parallel using multiple antennas, thereby obtaining additional spatial multiplexing gain. In order to better utilize the complex spatial characteristics of the channel, the transmitted data stream is generally pre-encoded, and the signal is pre-processed by using channel state information at the transmitting end, so as to improve the signal transmission quality.

In the NR system, a type TypeII codebook is defined, and the beamforming is realized based on a mode of linearly combining the beams in the combined beam set. The beams in the set of merged beams are selected from a set of candidate beams. The TypeII codebook may support a codebook of rank=1 and rank=2. Where rank=1, the precoding matrix W may be expressed as:

rank=2, the precoding matrix W can be expressed as:

wherein the coefficients in the precoding matrix can be expressed as

L represents the number of beams within the set of combined beams, < >>

The beams with index numbers (k 1, k 2) of the beams in the candidate beam set are represented. Each beam in the candidate beam set may be represented by a 2-dimensional DFT vector, which is obtained by performing Kronecker product on a DFT vector of a first dimension and a DFT vector of a second dimension, where a beam index k1 represents an index of the DFT vector of the first dimension, and a beam index k2 represents an index of the DFT vector of the second dimension. The candidate wave beam set is determined according to the port configuration and the oversampling rate of the base station side. Specifically, the number of antenna ports defining each polarization direction in the first dimension is N1, and the DFT vectors oversampled by O1 times are used to generate K1 DFT vectors in the first dimension, that is, k1=n1×o1, where two beam vectors of the K1 first dimension beam vectors are orthogonal to each other at each interval of O1 beam vectors. The number of antenna ports defining each polarization direction in the second dimension is N2, and K2 second dimension beam vectors, that is, k2=n2×o2, are generated using an O2-times oversampled DFT vector, and two beam vectors of the K2 second dimension beam vectors, which are each separated by O2 beam vectors, are orthogonal to each other. The total number of beams in the candidate beam set is thus k=k1×k2. For bipolar electrodes The antenna array is polarized and the beam vector is used for the antenna port in one polarization direction.

The first polarization direction r=0 and the second polarization direction r=1, l=0, 1 in the dual polarized antenna array represent layers, one for each column of the precoding matrix.

Representing the wideband amplitude factors acting on beam i in the combined beam set, in polarization direction r and layer i; />

Representing subband amplitude factors acting on beams i in the combined beam set in the polarization direction r and the first layer; c _r, I denotes the subband phase factor acting on beam i in the combined beam set in the polarization direction r and the first layer. The number of antenna ports that can be supported by the codebook structure of the type II codebook is {4,8,12,16,24,32}.

For each layer, all beams in the combined beam set are independently weighted linearly, and the amplitude and the phase in the linear weighting coefficients are quantized respectively to obtain a precoding matrix.

The feedback information of the terminal for the Type II codebook may include a wideband portion and a subband portion, where the wideband portion performs weighting coefficient parameter calculation for the configured whole bandwidth and feeds back a wideband amplitude factor, and specifically, for the Type II codebook, if the base station is configured to perform wideband amplitude feedback (the weighting coefficient parameter is configured as 'false'), the wideband portion needs to feed back the wideband amplitude factor of each beam over the whole bandwidth; the sub-band part is to calculate the weighting coefficient parameter for each sub-band and feed back the sub-band amplitude factor and the sub-band phase factor of each beam on each sub-band. Specifically, if the base station is configured to feed back the subband amplitude (the weighting coefficient parameter subband is configured as 'true'), the terminal needs to feed back the subband amplitude factor and the subband phase factor of each beam for each subband. When the number of sub-bands is large, the feedback overhead of the Type II codebook is large. The feedback overhead of the Type II codebook is therefore mainly determined by the overhead that the subband part needs feedback. And, the size of the feedback overhead is related to the number of configured orthogonal beams. The number of beams for linear combining supported by the current Type II codebook is l=2, l=3, and l=4. When the value of the beam number L is larger, the feedback overhead is huge, and more uplink resources are occupied.

In view of the above problems, as shown in fig. 4, the present application provides a feedback method of channel state information, including:

step 401: the terminal determines that N beams in the combined beam set form a first beam set in the combined beam set.

Wherein the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer.

Step 402: the terminal determines, for each polarization direction of each layer, a weighting coefficient parameter in the functional relationship for a weighting coefficient of each beam in the first set of beams, and a weighting coefficient of each beam in the second set of beams.

The second beam set is a beam set formed by beams except for the beams in the first beam set in the combined beam set.

Step 403: and the terminal feeds back the weighting coefficient parameters and the weighting coefficient of each beam in the second beam set to the network equipment.

Step 404: the network equipment receives the weighting coefficient parameters of each beam in the first beam set and the weighting coefficients of each beam in the second beam set fed back by the terminal.

Step 405: and the network equipment determines the weighting coefficient of each beam in the first beam set on each sub-band according to the weighting coefficient parameters of the beams and the functional relation.

Step 406: and the network equipment generates a precoding matrix according to the weighting coefficient of each beam in the first beam set and the weighting coefficient of each beam in the second beam set.

In this embodiment of the present invention, a terminal determines, in a combined beam set, a beam satisfying a functional relationship as a beam of a first beam set, and determines, by using the functional relationship and a weight coefficient of each beam in the first beam set of each polarization direction of each layer, a weight coefficient parameter of each beam in the first beam set of each polarization direction of each layer, so that, for each beam in the first beam set, the terminal needs only to feed back the weight coefficient parameter, and does not need to feed back each subband weight coefficient of each beam of each polarization direction of each layer, and can determine, on a network device side, the weight coefficient on each subband of each beam of each polarization direction of each layer by using the functional relationship and the weight coefficient parameter corresponding to the weight coefficient parameter. Therefore, compared with the prior art, the feedback overhead of the type II codebook in the subband amplitude feedback mode is effectively reduced.

Prior to step 401, the terminal may further determine a set of combined beams, which may specifically include:

Step one, a terminal determines the number L of beams in a combined beam set according to codebook parameter information configured by network equipment, wherein L is more than or equal to 2.

The network equipment configures the number L of beams in a combined beam set for the terminal; in a specific implementation process, the network device may configure codebook parameter information for the terminal, where the codebook parameter information may include the number of CSI-RS ports and may further include the number L of beams in the combined beam set. Specifically, the number of CSI-RS ports in one polarization direction configured in the codebook parameter information may be (N1, N2) (the total CSI-RS port number is 2N1N 2). Wherein N is ₁ and N₂ The number of antenna ports in the first dimension and the number of antenna ports in the second dimension in one polarization direction are respectively represented.

Of course, the L may be determined according to other manners, for example, after the terminal determines the number L of beams in the combined beam set, the determined number L of beams in the combined beam set may be sent to the network device, and the number L of beams in the combined beam set fed back by the network device is not limited herein.

Step two, the terminal determines L wave beams forming a combined wave beam set.

In the implementation process, the beams in the combined beam set may be orthogonal beams or non-orthogonal beams, which is not limited herein.

In one possible implementation, as shown in fig. 5, in all candidate beam sets, L mutually orthogonal beams are selected as the beams in the combined beam set. For example, the beams in the beam sets 1,2,3,4,5,6,7,8 in fig. 5 are mutually orthogonal. The selection of the beams may be determined by the base station to terminal channel conditions and/or interference conditions, and in particular may be determined by RSRP calculation. For example, l=4, the terminal may determine the beam {2,3,6,7} in the candidate beam set as a beam in the combined beam set.

In step 401, the determining, by the terminal, a manner in which N beams in the combined beam set form the first beam set may include:

step one, a terminal determines the number N of beams in a first beam set; the N is a positive integer; n is more than or equal to 1 and less than or equal to L.

The manner of determining the number N of beams in the first beam set by the terminal may configure the number N of beams in the first beam set for the terminal by the network device; and/or the terminal determines the number N of the beams in the first beam set according to the channel condition.

Specifically, the configuration N may be determined in a predefined manner, for example, predefined in the NR system, where the terminal and the network device do not need to notify each other; the network device may also be configured for the terminal, and in a specific implementation process, the network device may configure N for the terminal through codebook parameter information, that is, the codebook parameter information may further include an indication of the number N of beams in the first beam set; or the terminal can determine the feedback to the network equipment by itself. The N beams of different polarization directions for different layers may be the same or different. The number N of the first beam sets of different polarization directions of different layers may be the same or different.

By the method, in the embodiment of the application, the terminal takes the beams meeting the functional relation as the beams in the first beam set, so that the feedback channel state information of the beams in the first beam set only needs to feed back the weighting coefficient parameters, and the weighting coefficient of the beams on each sub-band does not need to be fed back, thereby greatly reducing the feedback cost.

And step two, aiming at each polarization direction of each layer, the terminal determines N beams in the determined L combined beam sets as a first beam set.

Specifically, for each polarization direction of each layer, the terminal may determine a weighting coefficient of the beam in each subband according to a channel condition, an interference condition, and the like from the base station to the terminal; the weighting coefficients may be determined in the same manner as the weighting coefficients of the existing type II, and may be obtained by calculating the subband eigenvectors of the channel. The weighting coefficients include at least one of a subband phase factor and a subband amplitude factor.

In step 402, the terminal may determine a weighting coefficient parameter for each beam in the first set of beams according to the determined functional relationship and the determined weighting coefficients for each subband for the beams.

Wherein the functional relationship is predefined, e.g. predefined in an NR system; or, the functional relationship is configured for the terminal by the network device. The weighting coefficients may include a subband amplitude factor and a subband phase factor.

One possible implementation way is that each weighting coefficient parameter in the functional relation is a complex number;

the functional relationship is a functional relationship with respect to frequency and weighting coefficient parameters that characterizes the subband weighting coefficients of each beam. The modulus in the functional relationship characterizes the amplitude factor and the phase in the functional relationship characterizes the phase factor.

In another possible implementation manner, each weighting coefficient parameter in the functional relationship is a real number; the functional relationship is a phase functional relationship and an amplitude functional relationship comprising the wave beams; the phase function is a function of frequency and weighting coefficient parameters that are satisfied by subband phase factors that characterize each beam, and the amplitude function is a function of frequency and weighting coefficient parameters that are satisfied by subband amplitude factors that characterize each beam.

In this embodiment of the present application, the functional relationship may determine a functional characteristic according to a specific requirement, for example, the functional relationship may be a functional relationship in which a weighting coefficient of each beam in the first beam set has a linear relationship with frequency; alternatively, the functional relationship includes a higher order term of the weighting coefficient and the frequency of each beam in the first beam set.

By determining the function characteristics, the terminal can feed back channel state information with different precision according to the needs, and the flexibility of feedback is increased.

In a specific implementation, the weighting coefficient parameter of the beam in the functional relationship may be a phase weighting coefficient and/or an amplitude weighting coefficient of one subband in the beam, and a slope of the subband phase weighting coefficient and/or the amplitude weighting coefficient of the beam with respect to frequency.

Taking a linear relationship as an example, as shown in fig. 6, the weighting coefficient of each beam in the first beam set is in a linear relationship with the subband index, specifically, may be a functional relationship in which, for each polarization direction of each layer, the subband amplitude factor of each beam in the first beam set is in a linear relationship with the subband index; it is also possible that the subband phase factor of each beam in the first set of beams is a linear function of the subband index for each polarization direction of each layer.

Alternatively, the functional relationship may be a functional relationship having a nonlinear relationship with an index of a subband or a subcarrier index; the plurality of weighting coefficient parameters in the functional relationship are weighting coefficient parameters of a non-linear term of a subband phase weighting coefficient and/or an amplitude weighting coefficient and a subband index or a subcarrier index of the beam.

To further reduce feedback overhead, in step 403, the weighting coefficient parameters of the first beam in the first beam set may further include non-fixed weighting coefficient parameters, and the terminal feeds back the weighting coefficient parameters of each beam in the first beam set to the network device, including:

The first beam may be each beam in the first beam set, or may be one or more beams in the first beam set, which is not limited herein.

By the method, when the terminal feeds back the weighting coefficient parameters of the first wave beam, the terminal only needs to feed back the non-fixed weighting coefficient parameters of the first wave beam, and does not need to feed back all the weighting coefficient parameters, so that the overhead of channel state information to be fed back by the terminal can be further reduced.

In addition, the weighting coefficient parameters of the first beam may further include fixed weighting coefficient parameters, which are predefined. Alternatively, the weighting coefficient parameters of the other beams in the first beam set than the first beam may be fixed weighting coefficient parameters, and thus the weighting coefficient parameters of the other beams in the first beam set than the first beam may not be fed back.

The fixed weighting coefficient parameters may be predefined for the system or may be determined by the terminal or network device, and are not limited herein.

In combination with the above embodiment, in step 404, the network device may only receive the non-fixed weighting coefficient parameters fed back by the terminal; without requiring a fixed weighting coefficient parameter of the receiving terminal.

In combination with the above embodiment, in step 404, it may include:

the network device determines a weighting coefficient for each beam in the first set of beams on each subband based on the non-fixed weighting coefficient parameters of the first beam, and a predefined fixed weighting coefficient parameter, and a functional relationship of the weighting coefficient parameters with frequency.

Specifically, if the network device determines that the non-fixed weighting coefficient parameter of the first beam is the weighting coefficient parameter of the first beam, the network device may determine the weighting coefficient of the first beam on each subband according to the non-fixed weighting coefficient parameter of the first beam and the functional relationship. If the network device determines that the weighting coefficient parameters of the beams except the first beam in the first beam set are fixed weighting coefficient parameters, determining the weighting coefficients of the beams except the first beam in the first beam set on each sub-band according to the fixed weighting coefficient parameters and the functional relation.

In one possible implementation manner, if the network device determines that the weighting coefficient parameters of the first beam include a non-fixed weighting coefficient parameter and a fixed weighting coefficient parameter, the network device may determine the weighting coefficient of the first beam on each subband according to the non-fixed weighting coefficient parameter and the fixed weighting coefficient parameter of the first beam and the functional relationship. The weighting coefficient parameters of the other beams in the first beam set except the first beam may be fixed weighting coefficient parameters, and if the weighting coefficient parameters of the other beams in the first beam set except the first beam are fixed weighting coefficient parameters, the fixed weighting coefficient parameters may not be fed back;

in the embodiment of the present application, in step 402, for the weighting coefficients of the beams in the second beam set, in the implementation process, for each polarization direction of each layer, the terminal determines the weighting coefficient of each of the L-N second beams. The weighting coefficients may be determined in the same manner as the weighting coefficients of the existing type II, and may be obtained by calculating wideband eigenvectors and/or subband eigenvectors of the channel. The weighting coefficients may include at least one of wideband phase factors, wideband amplitude factors, subband phase factors, and subband amplitude factors.

It should be noted that, the weighting coefficients of the beams in the second beam set may satisfy the functional relationship, or may be beams that do not satisfy the functional relationship, which is not limited herein, that is, the specific implementation manner of determining N may be determined according to the measurement result of the terminal, or may be determined according to the configuration of the network device or the NR system.

To further reduce the overhead required for the weighting coefficients of the beam feedback in the second set of beams, the weighting coefficients of the second beam in the second set of beams may comprise non-fixed weighting coefficients or the weighting coefficients of the second beam in the second set of beams are non-fixed weighting coefficients; the terminal sending the weighting coefficients to the network device may include:

In addition, the weighting coefficients may further comprise fixed weighting coefficients, the fixed weighting coefficients of the second beams of the second set of beams being predefined. Alternatively, the weighting coefficients of the other beams in the second beam set than the second beam may be fixed weighting coefficients, and thus the weighting coefficients of the other beams in the second beam set than the second beam may not be fed back.

The fixed weighting coefficients may be predefined for the system or may be determined by the terminal or network device, without limitation.

The second beam may be each beam in the second beam set, or may be one or more beams in the second beam set, which is not limited herein.

In a specific implementation process, the weighting coefficient may be carried in precoding matrix information and sent to the network equipment. The precoding matrix information may be CSI. The precoding matrix information may include one or more of a weighting coefficient parameter of each beam in the N first beam sets corresponding to each polarization direction of each layer, and a weighting coefficient of each beam in the L-N second beam sets corresponding to each polarization direction of each layer. Of course, the terminal may also include wideband weighting coefficients of each beam in the first beam set in the fed back precoding matrix information as needed.

In combination with the above embodiment, in step 404, the network device may only receive the non-fixed weighting coefficients of the second beam in the second beam set sent by the terminal; not receiving a predefined fixed weighting coefficient; to reduce feedback overhead.

Specifically, if the network device determines that the non-fixed weighting coefficient of the second beam is the weighting coefficient of the second beam, the network device may determine, according to the non-fixed weighting coefficient of the second beam, the non-fixed weighting coefficient of the second beam as the weighting coefficient of the second beam on each subband. If the network device determines that the weighting coefficients of the other beams except the second beam in the second beam set are fixed weighting coefficients, determining the weighting coefficients of the other beams except the second beam in the second beam set on each sub-band according to the fixed weighting coefficients.

In one possible implementation, if the network device determines that the weighting coefficient parameters of the second beam include a non-fixed weighting coefficient and a fixed weighting coefficient, the network device may determine the weighting coefficient of the second beam on each subband according to the non-fixed weighting coefficient and the fixed weighting coefficient of the second beam. The weighting coefficients of the other beams in the second beam set except the second beam may be fixed weighting coefficients, and if the weighting coefficients of the other beams in the second beam set except the second beam are fixed weighting coefficients, the fixed weighting coefficients may not be fed back;

According to the above embodiment, for the first beam set and the second beam set, the terminal may send the weighting coefficient parameter or the non-fixed weighting coefficient parameter of the first beam set and the weighting coefficient or the non-fixed weighting coefficient of the second beam set respectively, or may send them simultaneously, which is not limited herein.

The precoding matrix information may further include indication information of beams in the L sets of combined beams. The indication information is used for indicating the network equipment to perform data transmission with the terminal on the beams in the L combined beam sets. Of course, the indication information may also be sent separately to the network device, which is not limited herein.

In the implementation process, the terminal feeds back indication information of L beams forming the combined beam set to the network equipment; and/or the terminal feeds back indication information of N beams corresponding to the first beam set in each polarization direction of each layer to the network equipment; and/or the terminal feeds back the indication information of the beams forming the second beam set of each polarization direction of each layer to the network equipment.

The network equipment receives the indication information of the L beams forming the combined beam set fed back by the terminal; and/or the network equipment receives indication information of N beams forming the first beam set, which is fed back by the terminal; and/or the network equipment receives the indication information of the beams forming the second beam set, which is fed back by the terminal.

Through the indication information, the network device can determine the L beams in the combined beam set and the N beams in the first beam set determined by the terminal, so as to indicate the network device to determine the weighting coefficient of each beam in the first beam set on the N first beam sets through the weighting coefficient parameter or the non-fixed weighting coefficient parameter.

In one possible implementation, the network device generates a precoding matrix according to the weighting coefficients of each beam in the first set of beams on each subband and the weighting coefficients of each beam in the second set of beams.

In a possible implementation manner, the network device generates a precoding matrix according to the weighting coefficient of each beam in the first beam set on each sub-band, a predefined fixed weighting coefficient, and the non-fixed weighting coefficient of the second beam in the second beam set.

In an implementation, the network device may generate a precoding matrix for data transmission according to the following formula. For rank=k, the precoding matrix W is:

coefficients W for the first layer and the precoding matrix with polarization direction r (l=0, 1, …, K-1, r=0, 1) _r，l The method comprises the following steps:

wherein ,

m=n, …, L-1 denotes the beam in the second set of beams, k ₁ (m)k ₂ (m) is a beam index for a first dimension and a second dimension of beam m. The functional relation G _r,l,i (. Cndot.) may be predefined by the system or may be configured by the base station to the terminal.

The embodiment of the application also provides a specific embodiment of a signal state information feedback method, which comprises the following steps:

step one, network equipment configures codebook parameter information for a terminal;

the codebook parameter information may include one or more of a CSI-RS port number, a number L of combined beam sets, and a number N of first beam sets.

The CSI-RS port number in the codebook parameter information may be the CSI-RS port number (N1, N2) = (4, 2) of one polarization direction (the total CSI-RS port number is 2n1n2=16). N (N) ₁ and N₂ The number of antenna ports in the first dimension and the number of antenna ports in the second dimension in one polarization direction are respectively represented. For example, the number of beams of the combined beam set of the network device configuration codebook may be l=4, and the network device configures the first beam The number of beams in the set n=2.

In addition, the functional relationship with respect to frequency and weighting coefficient parameters that the weighting coefficients of each beam in the first set of beams satisfy may be predefined by the system. For example, for the first layer and beam i with polarization direction r, the system predefines a functional relationship of

Wherein the number of weighting parameters is 3, i.e. weighting parameters +.>

For describing the relation of subband amplitude factors and frequency, weighting coefficient parameters>

And weighting coefficient parameters->

Describing the relationship between the subband phase factor and frequency; k denotes an index of a subcarrier, where the index k of the subcarrier is quantization of the frequency f. The functional relationship indicates that the subband amplitude factor of a beam in the first set of beams is in a constant relationship with the index k of the subcarrier and the subband phase factor is in a linear relationship with the index k of the subcarrier.

Of course, the terminal may determine, according to factors such as channel quality and interference, a functional relationship regarding frequency and weighting coefficient parameters that the weighting coefficient of each beam in the first beam set satisfies, and feed back the functional relationship to the network device, which is not limited herein.

And step two, the terminal determines L=4 combined beams according to the indication of the network equipment L.

The indication of L may be carried in codebook parameter information sent by the network device, or may be sent to the terminal by other manners, which is not limited herein.

One possible implementation, among all candidate beams, selects 4 mutually orthogonal beams as beams in the combined beam set, the selection of which can be determined by the computation of RSRP. For example, as shown in fig. 5, the network device determines the number of beams in the combined beam set to be 4 in the candidate beam set, and the terminal determines the beams {2,3,6,7} as the combined beam set among the orthogonal beams {1,2,3,4,5,6,7,8 }.

And thirdly, selecting N=2 beams from the determined L=4 combined beam sets as beams in the first beam set by the terminal according to the indication of the network equipment for N and for each polarization direction of each layer.

The indication of N may be carried in codebook parameter information sent by the network device, or may be sent to the terminal by other manners, which is not limited herein.

The determining of the beams in the first set of beams may calculate a weighting coefficient for each subband of each beam from the result of the channel measurements, selecting N beams having a predefined functional relation of the weighting coefficient to the subband index or the subcarrier index as the beams in the first set of beams.

Taking the precoding matrix used for k=2 layer CSI reporting as an example, as shown in fig. 5, the terminal may determine the beam {3,6} of the beams {2,3,6,7} as the beam in the first beam set for each polarization direction of layer 1, and the beam {2,7} as the beam in the second beam set for each polarization direction of layer 1. Beams {2,6} may be determined to be beams in the first set of beams for the first polarization direction of layer 2, and beams {2,7} may be determined to be beams in the first set of beams for the second polarization direction of layer 2.

And step four, the terminal determines the weighting coefficient parameter of each wave beam according to the weighting coefficient of each sub-band of each wave beam in the first wave beam set.

And determining the weighting coefficient parameters of each beam in the first beam set according to the determined functional relation of each beam in the first beam set and the weighting coefficient of each sub-band of each beam. In connection with the above example, fig. 6 shows the calculated phase factor of each subband of a beam as a function of subband index. According to a predefined functional relationship of the system,

the weighting coefficient parameters can be determined from the initial value and the slope in FIG. 6, respectively>

And weighting coefficient parameters->

Similarly, from the relation between each subband amplitude factor and subband index of this beam, the weighting coefficient parameter +. >

Step five, for each polarization direction of each layer, the terminal determines a weighting coefficient of each beam in the L-n=2 second beam set.

For example, the weighting coefficients of beams {2,7} are determined for the first polarization direction and the second polarization direction of layer 1, respectively. This determination of the weighting coefficients may be the same as the determination of the weighting coefficients of the existing Type II, obtained by calculating the wideband eigenvector and the subband eigenvector of the channel.

And fifthly, the terminal feeds back the determined precoding matrix information to the base station.

The precoding matrix information includes indication information of L combined beam sets {2,3,6,7}, a weighting coefficient parameter of each beam in n=2 first beam sets corresponding to each polarization direction of each layer, and a weighting coefficient of each beam in L-n=2 second beam sets corresponding to each polarization direction of each layer. If the system predefines that the weighting coefficient parameter of the non-first beam in the first beam set is a fixed value, if the strongest beam is fixed therein, and the weighting coefficient parameter of the non-first beam is that the amplitude weighting coefficient parameter is 1 and the phase weighting coefficient parameter is 0, the weighting coefficient parameter of the non-first beam is taken as the fixed weighting coefficient parameter, and the fixed weighting coefficient parameter may not be fed back; similarly, if the system predefines that the weighting coefficient of the non-second beam in the second beam set is a fixed value, i.e. the weighting coefficient of the non-second beam is a fixed weighting coefficient, for example, the amplitude weighting factor is 1 and the phase weighting factor is 0, the fixed weighting coefficient of the non-second beam is not fed back, and only the non-fixed weighting coefficient of the second beam is fed back.

In addition, the terminal may further send indication information to the network device, where the indication information may include indication information of beams in the first beam set n=2 corresponding to each polarization direction of each layer, such as indication information of beams {2,6} of the first polarization direction of layer 2, indication information of beams {2,7} of the second polarization direction of layer 2, and so on.

Of course, the embodiment of the present application does not limit the transmission manner of the indication information and the precoding indication information, and the indication information may be carried in the precoding indication information, may be transmitted before the precoding indication information is transmitted, may be transmitted after the precoding indication information is transmitted, and is not limited herein.

And step six, the network equipment receives precoding matrix information fed back by the terminal.

The network device may also receive indication information fed back by the terminal, where the indication information is used to indicate one or more of beams in the combined beam set, beams in the first beam set, and beams in the second beam set corresponding to each polarization direction of each layer.

And seventh, the network equipment generates a precoding matrix according to the precoding indication information.

Specifically, for the precoding matrix used for reporting the K-layer CSI, the precoding matrix is generated according to the following formula, and is used for data transmission. Taking the precoding matrix W used for reporting the k=2 layer CSI as an example:

For layer l and polarization direction r (l=0, 1, …, K-1, r=0, 1), the coefficients of the precoding matrix can be expressed as:

the weighting coefficients for the beams in the second set of beams are:

wherein ,

representing wideband amplitude factor, +.>

Represents a subband amplitude factor, and +.>

Representing the subband phase factor. />

i=0, …, N-1 denotes a beam of the N first beam sets, +.>

m=n, …, L-1 represents a beam in the L-N second set of beams. And selecting the beams in the N first beam sets from the L combined beam sets, determining the weighting coefficient parameters of the beams and feeding back the beams, wherein the weighting coefficients of the beams in the other L-N second beam sets can be in a sub-band feedback mode or a broadband feedback mode. />

In this embodiment of the present invention, a terminal determines, in a combined beam set, a beam satisfying a functional relationship as a beam of a first beam set, and determines, by using the functional relationship and a weight coefficient of each beam in the first beam set of each polarization direction of each layer, a weight coefficient parameter of each beam in the first beam set of each polarization direction of each layer, so that, for each beam in the first beam set, the terminal needs only to feed back the weight coefficient parameter, and does not need to feed back each subband weight coefficient of each beam of each polarization direction of each layer, and can determine, on a network device side, the weight coefficient on each subband of each beam of each polarization direction of each layer by using the functional relationship and the weight coefficient parameter corresponding to the weight coefficient parameter. Therefore, on the premise of the same precision, the feedback overhead of the type II codebook is effectively reduced. Further, by determining the function characteristics, the terminal can feed back channel state information with different precision according to the needs, and the flexibility of feedback is increased. Furthermore, the non-fixed weighting coefficient parameter can be included in the weighting coefficient parameter, the terminal only needs to feed back the non-fixed weighting coefficient, and the fixed weighting coefficient can be determined in a predefined manner, so that the feedback overhead of the type II codebook is further reduced.

Based on the same application concept, as shown in fig. 7, an apparatus 20 provided in an embodiment of the present application includes at least one processor 21, a communication bus 22, a memory 23, and at least one communication interface 24.

The terminal 200 in fig. 3 may also be the apparatus 20 shown in fig. 7, for example. The apparatus 20 may implement, by the processor 21, steps related to a terminal in a feedback method of channel state information in the embodiments of the present application.

The base station 100 in fig. 3 may also be the apparatus 20 shown in fig. 7, where the apparatus 20 may implement, by the processor 21, steps related to a network device in a feedback method of channel state information in an embodiment of the present application.

The processor 21 may be a general purpose Central Processing Unit (CPU), microprocessor, application Specific Integrated Circuit (ASIC), or one or more integrated circuits for controlling the execution of programs in accordance with aspects of the present application.

Communication bus 22 may include a path to transfer information between the aforementioned components. The communication interface 24 uses any transceiver-like device for communicating with other devices or communication networks, such as ethernet, radio Access Network (RAN), wlan, etc.

The memory 23 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc (compact disc read-only memory) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and that can be accessed by the apparatus. The memory may be stand alone and coupled to the processor via a bus. The memory may also be integrated with the processor.

Wherein the memory 23 is used for storing application program codes for executing the scheme of the application, and the execution is controlled by the processor 21. The processor 21 is arranged to execute application code stored in the memory 23.

In a particular implementation, as one embodiment, processor 21 may include one or more CPUs, such as CPU0 and CPU1 of FIG. 7.

In a specific implementation, the apparatus 20 may include a plurality of processors, such as the processor 21 and the processor 28 in fig. 8, as an example. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

The embodiment of the present application may divide the functional modules of the apparatus shown in fig. 7 according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

In the present embodiment, the apparatus shown in fig. 7 is presented in the form of dividing each functional module corresponding to each function, or in the form of dividing each functional module in an integrated manner. "module" herein may refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the described functionality.

For example, in the case of dividing the respective functional modules by the respective functions, fig. 8 shows a possible structural schematic diagram of the apparatus involved in the above embodiment, and the apparatus 900 may be a terminal or a network device in the above embodiment. The apparatus 900 comprises a processing unit 901 and a transceiving unit 902. The transceiver unit 902 is configured to transceiver signals by the processing unit 901. The method performed by the processing unit 901 in fig. 8 may be implemented by the processor 21 (and/or the processor 28) and the memory 23 in fig. 7, and in particular, the method performed by the processing unit 901 may be performed by the processor 21 (and/or the processor 28) in fig. 3 invoking application program code stored in the memory 23, which is not limited in any way by the embodiments of the present application.

In a specific implementation, taking the apparatus 900 may be a terminal in the foregoing embodiment as an example, the embodiment of the present application provides a feedback apparatus for channel state information, including:

a processing unit 901, configured to determine, in a combined beam set, that N beams in the combined beam set form a first beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer; determining a weighting coefficient parameter of a weighting coefficient of each beam in the first beam set in the functional relation and a weighting coefficient of each beam in the second beam set; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

And a transceiver unit 902, configured to feed back the weighting coefficient parameter and the weighting coefficient of each beam in the second beam set to a network device.

One possible implementation, the weighting coefficient parameters of the first beam in the first beam set include non-fixed weighting coefficient parameters; the transceiver unit 902 is specifically configured to feed back the non-fixed weighting coefficient parameter of the first beam to the network device.

One possible implementation, the weighting coefficients of the second beams in the second set of beams comprise non-fixed weighting coefficients; the transceiver unit 902 is specifically configured to send the non-fixed weighting coefficient of the second beam to the network device.

A possible implementation manner, the transceiver unit 902 is further configured to receive a number N of beams in a first beam set configured by the network device for the terminal;

or, the processing unit 901 determines the number N of beams in the first beam set, and feeds back the N to the network device through the transceiver unit 902.

A possible implementation manner, the transceiver unit 902 is further configured to:

feeding back indication information of beams forming the combined beam set to network equipment;

And/or feeding back to the network device indication information constituting each beam of the first set of beams;

and/or feeding back to the network device indication information constituting each beam of the second set of beams.

Based on the same application concept, the embodiment of the present application further provides a circuit system, and fig. 9 is a schematic structural diagram of the circuit system (for example, an access point or a communication device such as a base station, a station or a terminal) provided in the embodiment of the present application.

As shown in fig. 9, circuitry 1200 may be implemented by bus 1201 as a general bus architecture. The bus 1201 may include any number of interconnecting buses and bridges depending on the specific application of the circuitry 1200 and the overall design constraints. The bus 1201 connects various circuits together, including the processor 1202, the storage medium 1203, and the bus interface 1204. Optionally, the circuitry 1200 uses a bus interface 1204 to connect a network adapter 1205 or the like via the bus 1201. The network adapter 1205 may be used to implement signal processing functions of a physical layer in a wireless communication network, and to implement transmission and reception of radio frequency signals through the antenna 1207. The user interface 1206 may connect to a user terminal, for example: a keyboard, a display, a mouse or a joystick, etc. The bus 1201 may also connect various other circuits such as timing sources, peripherals, voltage regulators, or power management circuits, which are well known in the art, and therefore, will not be described in detail.

Alternatively, the circuitry 1200 may be configured as a chip or system-on-chip including one or more microprocessors that provide processor functionality; and an external memory providing at least a portion of storage medium 1203, all of which are coupled with the other support circuitry via an external bus architecture.

Alternatively, circuitry 1200 may be implemented using an ASIC (application specific integrated circuit) having a processor 1202, a bus interface 1204, a user interface 1206; and at least a portion of the storage medium 1203 integrated in a single chip, or the circuitry 1200 may be implemented using one or more FPGAs (field programmable gate arrays), PLDs (programmable logic devices), controllers, state machines, gate logic, discrete hardware components, any other suitable circuit, or any combination of circuits capable of performing the various functions described throughout this application.

The processor 1202 is responsible for managing the bus and general processing, including the execution of software stored on the storage medium 1203. The processor 1202 may be implemented using one or more general-purpose processors and/or special-purpose processors. Examples of processors include microprocessors, microcontrollers, DSP processors, and other circuitry capable of executing software. Software should be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

In the following figures, the storage medium 1203 is shown as separate from the processor 1202, however, it will be readily apparent to those skilled in the art that the storage medium 1203 or any portion thereof may be located outside the circuitry 1200. By way of example, the storage medium 1203 may include a transmission line, a carrier wave modulated with data, and/or a computer product separate from the wireless node, which may be accessed by the processor 1202 via the bus interface 1204. In the alternative, the storage medium 1203 or any portion thereof may be integrated into the processor 1202 and may be, for example, a cache and/or general purpose registers.

The processor 1202 may execute the signal status information feedback method in any of the above embodiments of the present application, and the specific details are not described herein.

Fig. 10 is another schematic structure of the circuit system according to the embodiment of the present application. The circuitry may be a processor. The processor may be embodied as a System On Chip (SOC) provided in a base station or a terminal of the wireless communication system of the embodiments of the present application, so that the base station or the terminal implements the feedback method of channel state information of the embodiments of the present application. As shown in fig. 10, the circuitry 60 includes: an interface unit 601, a control and operation unit 602, and a storage unit 603. The interface unit is configured to communicate with other components of the base station or the terminal, the storage unit 603 is configured to store computer programs or instructions, and the control and operation unit 602 is configured to decode and execute the computer programs or instructions. It should be understood that these computer programs or instructions may include the terminal function programs described above, as well as the base station function programs described above. When the terminal function program is decoded and executed by the control and operation unit 602, the terminal can be enabled to implement the indication method of the uplink subband precoding matrix in the embodiment of the present application, and the function of the terminal. When the function program of the base station is decoded and executed by the control and operation unit 602, the base station can realize the function of the base station in the signal state information feedback method in the embodiment of the present application.

In one possible design, these terminal function programs or base station function programs are stored in a memory external to circuitry 60. When the terminal function program or the base station function program is decoded and executed by the control and operation unit 602, the storage unit 603 temporarily stores a part or all of the terminal function program or a part or all of the base station function program.

In another alternative implementation, these terminal function programs or base station function programs are provided in a memory unit 603 stored inside the circuitry 60. When the terminal function program is stored in the storage unit 603 inside the circuit system 60, the circuit system 60 may be provided in the terminal 200 of the wireless communication system of the embodiment of the present application. When the base station function program is stored in the storage unit 603 inside the circuitry 60, the circuitry 60 may be provided in the base station 100 of the wireless communication system of the embodiment of the present application.

In yet another alternative implementation, part of the contents of these terminal function programs or base station function programs are stored in a memory external to circuitry 60 and other part of the contents of these terminal function programs or base station function programs are stored in a memory unit 603 internal to circuitry 60.

Based on the same conception, the present application provides a computer readable storage medium having instructions stored therein which when run on a computer cause the computer to perform the terminal-related method steps in the various embodiments referred to herein.

Based on the same conception, the present application provides a computer readable storage medium having instructions stored therein which when run on a computer cause the computer to perform the method steps related to the base station in the various embodiments referred to herein.

Based on the same conception, the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the terminal-related method steps in the various embodiments referred to in the present application.

Based on the same conception, the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the method steps related to a base station in the various embodiments referred to in the present application.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.

It will be clearly understood by those skilled in the art that descriptions of the embodiments provided herein may be referred to each other, and for convenience and brevity of description, functions and steps performed by each apparatus and device provided in the embodiments of the present application may be referred to the related descriptions of the method embodiments of the present application, which are not repeated herein.

Although the present application has been described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus (device), or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects all generally referred to herein as a "module" or "system. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. A computer program may be stored/distributed on a suitable medium supplied together with or as part of other hardware, but may also take other forms, such as via the Internet or other wired or wireless telecommunication systems.

Those of skill would further appreciate that the various illustrative logical blocks (illustrative logical block) and steps (steps) described in connection with the embodiments herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components (illustrative components) and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Those skilled in the art may implement the described functionality in varying ways for each particular application, but such implementation is not to be understood as beyond the scope of the embodiments of the present application.

The various illustrative logical blocks, modules, and circuits described in connection with the embodiments herein may be implemented or performed with a general purpose processing unit, a digital signal processing unit, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processing unit may be a micro-processing unit, or alternatively, any conventional processing unit, controller, microcontroller, or state machine. The processing unit may also be implemented by a combination of computing devices, such as a digital signal processing unit and a micro-processing unit, a plurality of micro-processing units, one or more micro-processing units in combination with a digital signal processing unit core, or any other similar configuration.

In one or more exemplary designs, the above-described functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on a computer-readable medium or transmitted as one or more instructions or code on the computer-readable medium. Computer readable media includes both computer storage media and communication media that facilitate transfer of computer programs from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media may include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to carry or store program code in the form of instructions or data structures and other data structures that may be read by a general or special purpose computer, or a general or special purpose processing unit. Further, any connection is properly termed a computer-readable medium, e.g., if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic computer, twisted pair, digital Subscriber Line (DSL), or wireless such as infrared, radio, and microwave, and is also included in the definition of computer-readable medium. The disks (disks) and disks (disks) include compact disks, laser disks, optical disks, DVDs, floppy disks, and blu-ray discs where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included within the computer-readable media.

The foregoing description of the specification of the present application may be such that any person skilled in the art may make or use the content of the present application, and any modification based on the disclosure should be considered as obvious to the person skilled in the art, and the basic principles described in the present application may be applied to other variations without departing from the spirit and scope of the application of the present application. Thus, the disclosure is not limited to the embodiments and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for feeding back channel state information, comprising:

the terminal determines a weighting coefficient parameter of a weighting coefficient of each wave beam in the first wave beam set in the functional relation and a weighting coefficient of each wave beam in the second wave beam set aiming at each polarization direction of each layer; the weighting coefficient parameter is a parameter related to the frequency of the beam; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

2. The method of claim 1, wherein the weighting coefficient parameters of the first beam in the first set of beams comprise non-fixed weighting coefficient parameters;

the terminal feeds back the weighting coefficient parameters to network equipment, and the method comprises the following steps:

3. The method of claim 1, wherein the weighting coefficients of the second beam in the second set of beams comprise non-fixed weighting coefficients; the terminal sending the weighting coefficients to the network device, comprising:

4. A method according to any one of claims 1-3, wherein the method further comprises:

5. The method of claim 4, wherein the method further comprises:

6. The method of claim 5, wherein the functional relationship is predefined; or, the functional relationship is configured for the terminal by the network device.

7. The method of claim 6, wherein the weighting coefficients comprise at least one of wideband phase factors, wideband amplitude factors, subband phase factors, and subband amplitude factors.

8. A method for receiving channel state information, comprising:

the network equipment receives the weighting coefficient parameters of each wave beam in the first wave beam set and the weighting coefficients of each wave beam in the second wave beam set of each layer of each polarization direction fed back by the terminal; the weighting coefficient parameter is a parameter related to the frequency of the beam; the first beam set is a beam which is determined by the terminal in the combined beam set and meets a functional relation; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; n is a positive integer;

9. The method of claim 8, wherein the weighting coefficient parameters for the first beam in the first set of beams comprise non-fixed weighting coefficient parameters, and wherein the network device receives weighting coefficient parameters fed back by the terminal, comprising:

10. The method of claim 8, wherein the weighting coefficients of the second beam in the second set of beams comprise non-fixed weighting coefficients; the network device receives the weighting coefficient of each wave beam in the second wave beam set fed back by the terminal, and the weighting coefficient comprises:

11. The method according to any of claims 8-10, wherein for rank = K, the precoding matrix W is:

Is that

wherein ,

Representing N beams, k in a first set of beams ₁ (i)k ₂ (i) Beam index for the first dimension and the second dimension of beam i; / >

Representing beams in the second set of beams, k ₁ (m)k ₂ (m) is a beam index for a first dimension and a second dimension of beam m.

12. The method of claim 11, wherein the method further comprises:

13. The method of claim 12, wherein the method further comprises:

14. The method of claim 13, wherein the functional relationship is predefined; or, the functional relationship is configured for the terminal by the network device.

15. The method of claim 14, wherein the weighting coefficients comprise at least one of wideband phase factors, wideband amplitude factors, subband phase factors, and subband amplitude factors.

16. A feedback apparatus for channel state information, comprising:

a processing unit, configured to determine, in a combined beam set, that N beams in the combined beam set form a first beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer; determining, for each polarization direction of each layer, a weighting coefficient parameter in the functional relationship for a weighting coefficient of each beam in the first set of beams, and a weighting coefficient of each beam in the second set of beams; the weighting coefficient parameter is a parameter related to the frequency of the beam; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

17. The apparatus of claim 16, wherein the weighting coefficient parameters for the first beam in the first set of beams comprise non-fixed weighting coefficient parameters; the transceiver unit is specifically configured to: and feeding back the non-fixed weighting coefficient parameters of the first wave beam to the network equipment.

18. A feedback apparatus for channel state information, comprising:

the receiving and transmitting unit is used for receiving the weighting coefficient parameters of each wave beam in the first wave beam set and the weighting coefficients of each wave beam in the second wave beam set of each polarization direction fed back by the terminal; the weighting coefficient parameter is a parameter related to the frequency of the beam; the first beam set is a beam which is determined by the terminal in the combined beam set and meets a functional relation; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; n is a positive integer;

19. The apparatus of claim 18, wherein the weighting coefficient parameters for the first beam in the first set of beams comprise non-fixed weighting coefficient parameters; the receiving and transmitting unit is specifically used for receiving non-fixed weighting coefficient parameters fed back by the terminal;

20. A terminal, comprising: the device comprises a processor, a memory, a transceiver and a bus interface, wherein the processor, the memory and the transceiver are connected through the bus interface;

the processor is used for determining that N beams in the combined beam set form a first beam set in the combined beam set; the beams in the first set of beams satisfy a functional relationship; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; n is a positive integer; determining, for each polarization direction of each layer, a weighting coefficient parameter in the functional relationship for a weighting coefficient of each beam in the first set of beams, and a weighting coefficient of each beam in the second set of beams; the weighting coefficient parameter is a parameter related to the frequency of the beam; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set;

the bus interface is used for providing an interface.

21. The terminal of claim 20, wherein the weighting coefficient parameters of the first beam in the first set of beams comprise non-fixed weighting coefficient parameters; the transceiver is specifically configured to: and feeding back the non-fixed weighting coefficient parameters of the first wave beam to the network equipment.

22. A network device, comprising: the device comprises a processor, a memory, a transceiver and a bus interface, wherein the processor, the memory and the transceiver are connected through the bus interface;

the transceiver is used for receiving the weighting coefficient parameters of each wave beam in the first wave beam set and the weighting coefficients of each wave beam in the second wave beam set of each polarization direction of each layer fed back by the terminal; the weighting coefficient parameter is a parameter related to the frequency of the beam; the first beam set is a beam which is determined by the terminal in the combined beam set and meets a functional relation; the functional relation is the functional relation between the weighting coefficient of the wave beam and the frequency; the second beam set is a beam set formed by beams except the beams in the first beam set in the combined beam set; n is a positive integer;

the bus interface is used for providing an interface.

23. The network device of claim 22, wherein the weighting coefficient parameters for the first beam in the first set of beams comprise non-fixed weighting coefficient parameters; the transceiver is specifically configured to receive a non-fixed weighting coefficient parameter fed back by the terminal;