WO2018082459A1

WO2018082459A1 - Information feedback method, user equipment and network equipment

Info

Publication number: WO2018082459A1
Application number: PCT/CN2017/107138
Authority: WO
Inventors: 金黄平; 韩玮; 尚鹏; 毕晓艳
Original assignee: 华为技术有限公司
Priority date: 2016-11-04
Filing date: 2017-10-20
Publication date: 2018-05-11

Abstract

Disclosed by the present invention are a feedback method and a device for channel state information CSI, which belongs to the technical field of communications. The method comprises: determining a codebook of CSI of each transport layer of a user equipment UE, the codebook of CSI of each transport layer of the UE being: W＝W₁×W₂, wherein an element X_i in the W₂ is a weighting coefficient corresponding to each code word in W₁; the i is an integer greater than or equal to 1 and less than or equal to K; determining a bit number N_i occupied by a quantized value of the ith element in the W₂, the bit numbers occupied by the quantized values of at least two elements in the W₂ being different; and feeding the quantized value of the ith element back to the network equipment according to the N_i.

Description

Information feedback method, user equipment and network equipment

This application is required to be submitted to the China Patent Office on November 4, 2016, the application number is CN 201610963566.3, the invention name is “information feedback method, user equipment and network equipment” and the Chinese Patent Application was submitted on April 4, 2017. The priority of the application is CN 201710215597.5, the entire disclosure of which is hereby incorporated by reference in its entirety in its entirety in the the the the the the the the the the

Technical field

The present invention relates to wireless communication technologies, and in particular, to an information feedback method, a user equipment, and a network device.

Background technique

Massive MIMO (Multiple Input Multiple Output) technology is one of the key technologies recognized by the industry as a 5th Generation (5G) communication system. Massive MIMO achieves a significant increase in spectral efficiency by using large-scale antennas. The accuracy of the channel state information (CSI) acquired by the network device largely determines the performance of Massive MIMO. In a frequency division duplex (FDD) system or a time division duplex (TDD) system in which channel dissimilarity is not well met, a codebook is usually used to quantize CSI information. Therefore, codebook design is a key issue for Massive MIMO.

In the prior art, an optimal one codeword is selected from a plurality of candidate codewords, and the selected codeword is reported as CSI information in the form of a precoding matrix indication (PMI). New radio (mass MIMO of NR technology) puts forward higher requirements for channel state information feedback. The above mechanism can not meet the high precision CSI requirement of NR. In view of this, the discussion of NR design of high precision CSI feedback mechanism is mainly concentrated. In the method of linearly superimposing a plurality of codewords to represent CSI, the loss of quantization precision when CSI is represented by only a single codeword is compensated, and the quality of CSI feedback is significantly improved.

For the above method for linearly superimposing a plurality of codewords to represent CSI, it is necessary to provide an information feedback method to improve the accuracy of channel state information feedback.

Summary of the invention

In view of this, it is necessary to provide an information feedback method to improve the accuracy of channel state information feedback.

According to a first aspect of the present invention, an information feedback method is provided, including:

Determining a codebook of CSI of each transport layer of the user equipment UE, CSI of each transport layer of the UE The codebook is:

W=W ₁ ×W ₂ ,

Wherein W is the CSI UE codebook for each transport layer; W ₁ is the present one _{_{yard, W 1 = [b 1 b}} 2 ... b K], b _i representative of a code word; wherein The K is the number of columns of the W ₁ , the K is a positive integer greater than or equal to 1; W ₂ is a secondary codebook, and the W _{2 is} expressed as: W ₂ =[X ₁ X ₂ ... X _K ] elements ₂ ^T, wherein W X _i corresponding to the respective codeword W is _a weighting coefficient; the i is an integer greater than or equal to 1 less than the K;

Determining a quantization step in the i-th element ₂ of the number of bits occupied by W N _i, at least the number of bits of the quantized values of the elements in the two occupied by W ₂ are not the same;

According to the quantized value of said N _i i-th feedback element to the network device.

According to a second aspect of the present invention, an information feedback method is provided, including:

The network device receives a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE, and a codebook of a CSI of each transport layer of the UE is:

W=W ₁ ×W ₂ ,

Wherein W is the CSI UE codebook for each transport layer; W ₁ is the present one _{_{yard, W 1 = [b 1 b}} 2 ... b K], b _i representative of a code word; wherein The K is the number of columns of the W ₁ , the K is a positive integer greater than or equal to 1; W ₂ is a secondary codebook, and the W _{2 is} expressed as: W ₂ =[X ₁ X ₂ ... X _K ] ^T, where the element X is W ₂ W _i is the weighting coefficient corresponding to _a respective codeword; i is greater than or equal to the integer K less than 1; and each of the CSI UE, the transport layer The quantized value of the codebook includes: a quantized value of the element X _i in the W ₂ ; the quantized value of at least two of the elements in the W ₂ occupying a different number of bits;

Determining, by the network device, the number of bits N _i occupied by the quantized value of the i th element in the W ₂ ;

The network device i-th element value quantization according to a bit sequence from the received N _i in the extract.

According to a third aspect of the present invention, a user equipment is provided, including:

a processing unit, configured to determine a codebook of a CSI of each transport layer of the UE, where a codebook of a CSI of each transport layer of the UE is:

W=W ₁ ×W ₂ ,

The processing unit is further configured to determine the quantized values ₂ i-th element of the N number of bits occupied by W _i, at least the number of bits of the quantized values of the elements in the two occupied by W ₂ are not the same;

Transmission means for the quantized values according to said N _i i-th element of the feedback to the network device.

According to a fourth aspect of the present invention, a network device is provided, including:

a receiving unit, configured to receive a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE, where a codebook of a CSI of each transport layer of the UE is :

W=W ₁ ×W ₂ ,

The processing unit for determining the quantized value W ₂ of the i-th element of occupied bits N _i; for extracting the i-th element of the bit string from the received N _i in Quantitative value.

Embodiments of the present invention, determining the quantized values ₂ i-th element of the N number of bits occupied by W _i, at least the number of bits in the quantized values of the elements of the two W ₂ is not occupied by the same, can be improved The accuracy of the quantization is mentioned, so that the accuracy of the CSI feedback can be improved.

DRAWINGS

1 is an exemplary schematic diagram of a wireless communication network in accordance with an embodiment of the present invention;

2 is a schematic diagram of a CSI feedback process according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the invention; FIG.

4 is a schematic structural diagram of a network device according to an embodiment of the invention;

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

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

detailed description

With the continuous development of communication theory and practice, more and more wireless communication technologies are beginning to emerge and gradually mature. The above wireless communication technologies include, but are not limited to, Time Division Multiple Access (TDMA) technology, Frequency Division Multiple Access (FDMA) technology, Code Division Multiple Access (CDMA) technology, and time division. Time Division-Synchronous Code Division Multiple Access (TD-SCDMA), Orthogonal Frequency Division Multiple Access (OFDMA), single carrier frequency division multiple access (Single Carrier FDMA, SC-FDMA) , Space Division Multiple Access (SDMA) technology, and the evolution and derivative technologies of these technologies. The above wireless communication technology is adopted as a radio access technology (RAT) by many wireless communication standards, thereby constructing various wireless communication systems (or networks) well known today, including but not limited to Global System for Mobile Communications (GSM), CDMA2000, Wideband CDMA (WCDMA), WiFi defined by the 802.11 series of standards, Worldwide Interoperability for Microwave Access (WiMAX), long-term Evolution (Long Term Evolution, LTE), LTE-Advanced (LTE-A), and evolution systems of these wireless communication systems. The technical solutions provided by the embodiments of the present invention are applicable to the above various wireless communication technologies and wireless communication systems, unless otherwise specified. Furthermore, the terms "system" and "network" can be replaced with each other.

1 is an exemplary schematic diagram of a wireless communication network in accordance with an embodiment of the present invention. As shown in FIG. 1, the wireless communication network includes network devices 102-106 and user equipment (UE) 108-122, wherein the network devices 102-106 can communicate with each other through a backhaul link (such as a network device). Communication is performed as shown by the line between 102 and 106. The backhaul link may be a wired backhaul link (e.g., fiber optic, copper) or a wireless backhaul link (e.g., microwave). User devices 108-122 can communicate with network devices 102-106 over a wireless link (as indicated by the broken lines between network devices 102-106 and user devices 108-122).

The network devices 102-106 are configured to provide wireless access services for the user devices 108-118. Specifically, each network The network device provides a service coverage area (also referred to as a cell, as shown in each ellipse area in Figure 1), and user equipment entering the area can communicate with the network device through wireless signals to accept the wireless provided by the network device. Access service. There may be overlaps between service coverage areas of network devices, and user equipments in overlapping areas may receive wireless signals from multiple network devices. For example, as shown in FIG. 1, the network device 102 overlaps with the service coverage area of the network device 104, and the user equipment 112 is within the overlapping area, so the user equipment 112 can receive the network device 102 and the network device 104. Wireless signal. For another example, as shown in FIG. 1, the service coverage areas of the

network devices

102, 104, and 106 have a common overlapping area, and the user equipment 120 is within the overlapping area, so the user equipment 120 can receive the network equipment. Wireless signals of 102, 104 and 106.

The network device may be referred to as a Node B (NodeB), an evolved Node B (eNodeB), and an Access Point (AP), etc., depending on the wireless communication technology used. In addition, according to the size of the service coverage area provided, the network device can be further divided into a macro base station for providing a macro cell, a micro base station for providing a pico cell, and a femtocell for providing a femto cell. (Femto cell) femto base station. As wireless communication technologies continue to evolve, future network devices can adopt other names.

User devices 108-118 may be various wireless communication devices having wireless communication functions such as, but not limited to, mobile cellular phones, cordless phones, personal digital assistants (PDAs), smart phones, notebook computers, tablets, wireless devices. A data card, a modem (Modulator demodulator, Modem), or a wearable device such as a smart watch. With the rise of the Internet of Things (IOT) technology, more and more devices that did not have communication functions before, such as, but not limited to, household appliances, vehicles, tools, equipment, and service facilities, began to deploy wireless. The communication unit obtains a wireless communication function so that it can access the wireless communication network and accept remote control. Such devices have wireless communication functions because they are equipped with wireless communication units, and therefore belong to the category of wireless communication devices. In addition, user equipments 108-118 may also be referred to as mobile stations, mobile devices, mobile terminals, wireless terminals, handheld devices, clients, and the like.

Network devices 102-106, and user devices 108-122 can be configured with multiple antennas to support MIMO technology. Further, the user equipments 108-122 can support single-user MIMO (SU-MIMO), and can also support multi-user MIMO (Multi-User MIMO, MU-MIMO) by means of SDMA technology. The network devices 102-106 and the user equipments 108-122 can flexibly support Single Input Single Output (SISO) technology, Single Input Multiple Output (SIMO), and multiple Multiple Input Single Output (MISO) technology, in which SIMO is also called Receive Diversity (RD), and MISO is also called Transmit Diversity (TD).

Moreover, network device 102 and user devices 104-110 can communicate using various wireless communication technologies, such as, but not limited to, the various wireless communication technologies mentioned above.

It should be noted that the wireless communication network shown in FIG. 1 is for example only and is not intended to limit the technical solution of the present invention. It should be understood by those skilled in the art that in a specific implementation process, the wireless communication network further includes other devices, such as but not limited to network device controllers, and the network devices and user devices may also be configured according to specific needs.

According to the technical solution provided by the embodiment of the present invention, the user equipment feeds back channel state information (CSI) to the network device, and the network device adjusts the wireless signal that needs to be sent to the user equipment according to the CSI, so as to be on the user equipment side. Achieve better reception. The CSI feedback process provided by the embodiment of the present invention is specifically described below.

In the process of feeding back CSI information, the network device sends a downlink signal, where the downlink signal carries a pilot. The user equipment determines channel information according to the pilot included in the received downlink signal. For example, the channel information can be represented as a channel matrix. The user equipment determines a codebook for indicating the CSI of the UE according to the determined channel information and the preset codebook, and generates a CSI according to the CSI codebook of the UE, and feeds the CSI to the network device. The network device obtains the codebook of the CSI of the UE according to the received CSI. The network device can use the codebook to precode the signals that need to be sent to the user equipment.

If there are L transport layers, L is greater than or equal to 1, the user equipment respectively determines the codebook of the CSI of each transport layer, and generates the CSI of the transport layer according to the codebook of the CSI of each transport layer of the UE.

The preset codebook can be expressed as: B = [b ₁ b ₂ ... b _M ], where b _i is the i-th codeword in the preset codebook B.

The codebook of the CSI of each transport layer of the UE can be expressed as:

W=W ₁ ×W ₂ ,

The W is a codebook of a CSI of each transport layer of the UE. W ₁ is a primary codebook and can be expressed as W ₁ =[b ₁ b ₂ ... b _K ]. b _{i in} W ₁ represents a code word. Wherein K is the number of columns of the W ₁ and the K is a positive integer greater than or equal to 1. b _{i in} W ₁ may be a column vector, and b _i in W ₁ is a code word selected from codebook B. The UE may select an appropriate codeword in the preset codebook based on the determined channel information based on a preset selection criterion (such as, but not limited to, a maximum channel capacity criterion, a minimum mean square error criterion, or a minimum singular value criterion, etc.). . The b _i in W ₁ selected from the codebook B may be selected by the UE from the codebook B according to the channel information. For example, the selected codeword is the channel feature vector of the UE or the precoding vector is calculated from the UE channel information, and the base of the largest K is projected in the codebook B. The UE may select the codebook W ₁ wideband or narrowband channel information, the actual system, the UE is assigned one or more sub-band. The wideband channel information is used to represent the overall channel characteristics of all subbands occupied by the UE, such as the average of the channel information of all subbands allocated. The channel information is used to characterize the channel characteristics and may be directly the correlation matrix of the channel H or H.

Wherein, W ₁ may also be expressed as W ₁ =[p ₁ b ₁ p ₂ b ₂ ... p _K b _K ], wherein the K is the number of columns of the W ₁ and the K is a positive integer greater than or equal to 1 b _{i in} W ₁ represents a code word, and p _i represents amplitude weight information of the corresponding code word, 0 ≤ p _i ≤ 1, p ₁ =1. b _{i in} W ₁ may be a column vector, and b _i in W ₁ is a code word selected from codebook B. The UE may select an appropriate one of the preset codebooks based on the determined broadband or narrowband channel information based on a preset selection criterion (such as, but not limited to, a maximum channel capacity criterion, a minimum mean square error criterion, or a minimum singular value criterion). Codeword. The b _i in W ₁ selected from the codebook B may be selected by the UE from the codebook B according to the channel information. For example, the selected codeword is the channel feature vector of the UE or the precoding vector is calculated from the UE channel information, and the base of the largest K is projected in the codebook B. The amplitude weight information p _{i of the} corresponding codeword can also be obtained from the broadband or narrowband channel information of the UE.

The receiving end device can determine the above channel matrix by using a pilot (Pilot) transmitted by the transmitting end device.

W ₂ for the two codebooks, which may be expressed as W _{_{_2: W 2 = [X 1 X}} 2 ... X K] T, where the elements ₂ W X _i is the respective codeword W ₁ a weighting coefficient corresponding to b _i ; the i is an integer greater than or equal to 1 and less than or equal to K. W ₂ code may be calculated from the present UE wideband channel information, such that each sub-band corresponds to the same set of the UE codebook coefficients, i.e. in this case, only the UE needs to feed back a W _2. W ₂ may be calculated from the codebook narrowband channel information of the UE, so that each sub-band corresponds to the UE a coefficient codebook, i.e. in this case, the UE needs to each subband feedback W _2. The weighting factor W ₂ is often the case, the narrow-band channel or wideband channel feature vectors of the UE, or precoding vectors obtained by the UE narrowband or wideband channel information calculation, the substrate in the projection of W _1. In general, the weighting factor of the codeword in W ₁ can be expressed as:

A column conversion is performed for W' ₂ , expressed as W ₂ = [X ₁ X ₂ ... X _K ] ^T .

Wherein said further be expressed as W _{_{_2: W 2 = [1 X 2}} ... X K] T, where the elements ₂ W ₁ W 1 is a first column vector of the weighting coefficient corresponding; X _i is the The weighting coefficient corresponding to the i-th column vector in W ₁ ; the i is an integer greater than or equal to 2 and less than or equal to K. W ₂ code may be calculated from the present UE wideband channel information, such that each sub-band corresponds to the same set of the UE codebook coefficients, i.e. in this case, only the UE needs to feed back a W _2. W ₂ may be calculated from the codebook narrowband channel information of the UE, so that each sub-band corresponds to the UE a coefficient codebook, i.e. in this case, the UE needs to each subband feedback W _2. The weighting factor W ₂ is often the case, the narrow-band channel or wideband channel feature vectors of the UE, or precoding vectors obtained by the UE narrowband or wideband channel information calculation, the substrate in the projection of W _1. In general, the weighting factor of the codeword in W ₁ can be expressed as:

Of W _'2 a column for conversion, expressed as _{_{W 2 = [1 X 2 ...}} X K] T.

Generating CSI according to the codebook of the CSI of each transport layer of the UE, generally refers to carrying an index corresponding to the values of the corresponding W ₁ and W ₂ in the codebook of the CSI of each transport layer of the UE, In the corresponding Precoding Matrix Indicator (PM Indicator, PMI), it is used as CSI feedback. In addition to including the PMI, the CSI may further include at least one of the following indications: a Channel Quality Indicator (CQI) and a Rank Indication (RI). The air interface resources are limited, and the number of bits used for transmitting CSI is limited. In order to use a limited number of bits transmitted consecutive W2 codebook values, the value W ₂ need to quantify the elements, so that the output bit sequence is used to indicate the index value W2 in the element. Quantization is to characterize the continuous range as a discrete range, such as dividing the interval [0-10] into four subintervals [0-4], [5-6], [7-8] and [8-10]. The four subintervals are characterized by indices 0, 1, 2, and 3, respectively. For example, if the value 3 belongs to the subinterval [0-4], it can be indexed with the index 0.

The number of bits N _i embodiment of the present invention, determining the quantized value p _i in _a number of bits occupied by the W M _i, ₂ digital values of the i-th element of W occupied. For p _i (i=2 to K) in W ₁ , the quantized value of at least two elements occupies different numbers of bits; for the second to K elements in W ₂ , the quantized value of at least two elements The number of occupied bits is different. Or, for p _i (i=2 to K) in W ₁ , the quantized values of all elements occupy the same number of bits; for the second to K elements in W ₂ , the quantized values of at least two elements occupy The number of bits is different. Or, for p _i (i=2 to K) in W ₁ , the quantized value of at least two elements occupies different numbers of bits; for the second to K elements in W ₂ , the quantized values of all elements occupy The number of bits is the same.

In actual operation, the methods for acquiring W ₁ and W ₂ may have various methods. For example, W ₁ and W ₂ may be determined according to the wideband channel information, and one of W ₁ and W ₂ may be updated according to the narrowband channel information. In this way, one of the obtained W ₁ and W ₂ is obtained based on the broadband information, and the other is obtained based on the narrowband information, and the above content can refer to the prior art, and details are not described herein again. Alternatively, it is also possible to determine W ₁ and W ₂ according to the narrowband channel information, and then update one of W ₁ and W ₂ according to the wideband channel information, so that one of the obtained W ₁ and W ₂ is based on the broadband information. The obtained one is obtained based on the narrowband information, and the above content can refer to the prior art, and details are not described herein again. Alternatively, W ₁ and W ₂ may be determined according to the wideband channel information and the narrowband channel information, respectively, and the specific method is not described again.

FIG. 2 is a schematic flowchart of a method for feeding back channel state information CSI according to the first embodiment of the present invention. The method can be applied to the communication system described in FIG.

Method 200 includes:

S210. The UE determines a codebook of a CSI of each transport layer of the user equipment UE.

For a description of the codebook of the CSI of each transport layer of the UE, refer to the foregoing description, which is not repeated here.

Optionally, before the UE determines the codebook of the CSI of each transport layer of the UE, the pilot sent by the network device network device may be received. The user equipment determines channel information based on the received pilot. For example, the channel information can be represented as a channel matrix. The user equipment determines a codebook for indicating the CSI of the UE according to the determined channel information and the preset codebook.

Optionally, the element X _i in the W ₂ may be a complex number, and X _i may be expressed as:

α _i represents the amplitude of the i-th element, and θ _i represents the phase of the i-th element.

S220, the UE determines the quantized value of i-th element ₂ of the number of bits occupied by W N _i, at least the number of bits of the quantized values of the elements in the two occupied by W ₂ are not the same.

The number of bits occupied by the quantized values of all elements of W ₂ can be represented by N _total . Optionally, N _total = K * M, wherein the K is the number of columns of the W ₁ , the K is a positive integer greater than or equal to 1, and the M is used for the W ₂ column vector quantization The average number of quantization bits per element.

Alternatively, the number of bits necessary to determine the quantized value W ₁ b _i, and the quantized values W ₁ b _i occupied.

Alternatively, if the element X _i in the W ₂ can be a complex number, it is necessary to separately determine the amplitude quantized value of the element X _{i and} the quantized value of the phase. Further comprising: respectively determining a number of bits occupied by the quantized value of the amplitude of the _i- th element and a number of bits occupied by the quantized value of the phase of the i-th element, N _i-phase . Optionally, when the N _{i is} less than a threshold, N _i-phase =N _i ; or, when the N _{i is} greater than or equal to a threshold, determining the N _i-amp and the N _i according to a certain ratio _-phase , where N _i-amp +N _i-phase =N _i . such as,

N _i-amp =N _i -N _i-phase . Where 0 < ω < 1, the ω is the ratio of N _i-phase and N _total .

Optionally, the ith element in the W ₂ may also be split into real and imaginary parts for quantization respectively. For details, reference may be made to the aforementioned quantization method of amplitude and phase.

Alternatively, it is necessary to determine the quantized value W ₁ b _i, and bits of the quantized values W ₁ b _i occupied.

S230, the UE according to the quantized value of said N _i i-th feedback element to the network device.

The UE according to the feedback of the quantized value N _i i-th element, usually according to the quantized values of the N _i of the i-th element is carried in the corresponding precoding matrix indication (PM Indicator, PMI) In the CSI feedback to the network device.

Optionally, the UE feeds back the quantized values W ₁ b _i bits according to the quantization values W ₁ b _i to the occupied network device. That is, the quantized value of b _i in W ₁ is carried in a corresponding Precoding Matrix Indicator (PM Indicator, PMI), and fed back to the network device as CSI.

Optionally, the network device and the UE may pre-determine a bit position occupied by the ith element quantization value in the W ₂ , or a bit position occupied by the network device according to the quantized value of b _i in the W ₁ Determining a bit position occupied by the corresponding i-th element quantized value in the W ₂ . Alternatively, the UE notifies the bit position ₂ in the i-th element of the quantized values W occupied.

S240. The network device receives a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE.

The quantized value of the codebook of the CSI of each transport layer of the UE includes: a quantized value of the element X _i in the W ₂ ; and a quantized value of at least two of the elements in the W ₂ in the bit sequence The number of occupied bits is different.

Alternatively, Alternatively, if the element X _i W ₂ may include a plurality of quantized values X _i of the element ₂ in the W: quantization values of quantized values of the amplitude and phase of the elements of X _i.

Optionally, if the UE sends the quantized value of b _i in the W ₁ , the network device receives, by the UE, the quantized value of the b _i in the W ₁ .

S250, the network device determines the quantized value W ₂ of the i-th element of occupied bits N _i;

Optionally, if the UE carries the quantized value of b _i in the W ₁ in a corresponding Precoding Matrix Indicator (PM Indicator, PMI), the CSI is fed back to the network device. The method further includes: determining, by the network device, the number of bits occupied by the quantized value of b _i in the W ₁ .

Optionally, if the element X _i in the W ₂ may be a complex number, the method further includes: determining a number of bits occupied by the quantized value of the amplitude of the ith element, respectively, and a quantity of the _i- th element The number of bits occupied by the quantized value of the phase is n _i-phase when each element is quantized. For the step and step S220, refer to step S220.

S260, the network device i-th element value quantization according to a bit sequence from the received N _i in the extract.

Optionally, if the UE carries the quantized value of b _i in the W ₁ in a corresponding Precoding Matrix Indicator (PM Indicator, PMI), the CSI is fed back to the network device. Further comprising: the network device extracting the quantized value of the b _i according to the number of bits occupied by the quantized value of b _i in the W ₁ .

Optionally, the network device and the UE may pre-determine a bit position occupied by the ith element quantization value in the W ₂ , or a bit position occupied by the network device according to the quantized value of b _i in the W ₁ Determining a bit position occupied by the corresponding i-th element quantized value in the W ₂ . Alternatively, the UE notifies the bit position ₂ in the i-th element of the quantized values W occupied. The quantization value of the i th element of the network device according to extract the i-th element of quantized values and a bit position occupied by a bit sequence from the received N _i's.

Embodiments of the present invention, determining the quantized values ₂ i-th element of the N number of bits occupied by W _i, at least the number of bits in the quantized values of the elements of the two W ₂ is not occupied by the same, can be improved The accuracy of the quantization is improved, so that the accuracy of the CSI feedback can be improved.

A second embodiment of the present invention provides a feedback method of a CSI. The second embodiment is different from the first embodiment in that the method further includes: the UE according to the Nth element pair in the W ₂ W ₂ normalizing process, wherein N is an integer greater than or equal to 1 less than or equal to K; determining the value of the quantization of the W ₂ i-th element of the N number of bits occupied by the _i comprising: when i = When N, N _i =0. That is, the sum of the number of quantization bits of the K-1 elements except the Nth element is equal to N _total . That is to say, no quantization processing is required for the Nth element.

Optionally, the value of N is a value pre-agreed by the UE and the network device. ₂ is the i-th element of the W quantized reference UE and the network device are known in advance, without notifying the N-th element of quantized bit values. For example, the N is equal to 1 or K, that is, the Nth element is the first or last element of the W ₂ . Alternatively, if the corresponding element in W ₂ W ₁ PMI codebook sequence is determined in advance, in order to improve the performance of the present invention, for W ₁ PMI codebook sorted order. For example, when the UE selects the W ₁ codebook PMI, the calculated amplitude values of each element of the ideal W ₂ codebook column vector are sorted in order from large to small, or from small to large. For example, the Nth element is an element corresponding to the maximum value of all elements in the column in each of the 2 codebooks.

An embodiment of the present invention provides a second CSI feedback method, where the value of N is a value pre-agreed by the UE and the network device, and the UE does not notify the network device of the Nth element quantization bit value. The sum of the number of quantization bits of the K-1 elements except the Nth element occupies the N _{total used} , so that the accuracy of quantization can be further improved.

A third embodiment of the present invention provides a feedback method of a CSI. The third embodiment is different from the second embodiment and the first embodiment in that the determining the quantization of the ith element in the W ₂ The number of bits occupied by the value N _i includes: when i ≠ N, the value of N _i is positively correlated with the amplitude value of the i element.

Optionally, when i≠N, the

Where ρ _i is the amplitude value of the ith element,

Denotes the maximum integer not greater than x, the number of bits of the N quantized values of all the elements of the W ₂ occupied by _total.

Optional, said

Where N _base is the occupied basic number of bits of the quantized value of the i-th element, and N _add,i is the number of additional bits occupied by the quantized value of the i-th element.

Optionally, the N _add,i is further allocated according to the remaining number of bits N _rest =N _total -(K-1)N _base , and:

among them,

Represents the largest integer not greater than x.

In the third embodiment, the quantization value of ₂ W i-th element of the occupied bits N _i n i associated with the amplitude values of elements, can further improve the accuracy of quantization.

A fourth embodiment of the present invention provides a feedback method for a CSI. The fourth embodiment differs from the previous embodiment in that if the X _i is a complex number including amplitude and phase, when i ≠ N, the method further includes: The amplitude of the i-th element is quantized; the quantizing the amplitude of the i-th element includes: quantizing the amplitude of the i-th element when quantizing the amplitude of the i-th element, The differential amplitude of the i-th element is the ratio of the amplitude value ρ _i of the i-th element to the amplitude value ρ _i-1 of the _i-th element

Optionally, the quantification

Including: the differential amplitude of the ith element

Mapping to the angular domain yields ζ _i , which quantizes the ζ _i .

When the amplitude value of the i-th element is smaller than the amplitude value of the i-th element, the differential amplitude ranges from (0, 1),

Mapping to the angle domain for quantization; when the amplitude value of the i-th element is greater than the amplitude value of the i-th element, the differential amplitude quantization value of the i-th element is set to 1. such as

Optionally, the quantized value of the amplitude of the ith element is

Where (ρ _i ) ^q represents the amplitude quantized value of the i-th element in the value W ₂ ,

Expressed as the differential amplitude quantized value of the ith element of the W ₂ .

Optionally, the X _i is a complex number, including an amplitude and a phase. When i ≠ N, the method further comprises: quantizing the phase of the ith element by using a multi-digit digital phase modulation MPSK. Optionally, the quantizing the phase of the ith element by using the MPSK includes:

When the number of bits quantized to the phase of the i-th element is b, the quantized phase belongs to

j=0~2 ^b -1.

In the fourth embodiment, when the amplitude of the i-th element in the W ₂ is quantized, the i-th element difference amplitude is quantized, and the difference amplitude of the i-th element is the i-th element [rho] _i-1 value of the amplitude ratio ρ _i and i-1 th element value of the magnitude

The use of elemental amplitude differential quantization reduces the quantization range and further improves the accuracy of quantization.

Based on the same technical concept, the embodiment of the present invention provides a user equipment 300 for performing the method of the embodiment of the present invention. For related content, refer to the description of the method, which is not repeated here. The user equipment communicates with the network device provided in the instinctive inventive embodiment. Among them, as shown in Figure 3:

The user equipment 300 includes: a processing unit 302 and a sending unit 303. The processing unit may specifically be a processor, and the sending unit may specifically be a transmitter. Optionally, the user equipment may further include a receiving unit 301, where the receiving unit may specifically be a receiver.

The processing unit is configured to determine a codebook of a CSI of each of the transport layers of the UE; and the related information of the codebook of the CSI of each transport layer of the UE may be referred to the previous description, and is not repeated here.

Optionally, the receiving unit is configured to receive pilot information sent by the network device, where the processing unit is configured to determine channel information according to the pilot information received by the receiving unit, and determine, according to the channel information, The codebook of the UE. The processing unit is further configured to perform quantization on the codebook of the UE to obtain the quantized value.

Optionally, the processing unit is further configured to perform normalization processing on the W ₂ according to the Nth element in the W ₂ , where the N is an integer greater than or equal to 1 and less than or equal to K; When =N, N _i =0.

Optionally, when i ≠ N, the value of N _i is positively correlated with the amplitude value of the i element.

Optionally, the value of N is a value pre-agreed by the UE and the network device. For example, the N is equal to 1 or K.

Optionally, when i≠N, the

Where ρ _i is the amplitude value of the ith element,

Optionally, when i≠N, the

among them,

Represents the largest integer not greater than x.

Optionally, the X _i is a complex number, including an amplitude and a phase. When i ≠ N, the processing unit is further configured to quantize the amplitude of the ith element; when quantizing the ith The processing unit is configured to quantize the ith element difference amplitude, and the difference amplitude of the ith element is the amplitude value ρ _i and the i-1th element of the ith element Ratio of amplitude values ρ _i-1

Optionally, the processing unit is configured to: compare a differential amplitude of the ith element

Mapping to the angular domain yields ζ _i , which quantizes the ζ _i .

Optionally, when the amplitude value of the i-th element is smaller than the amplitude value of the i-th element, the differential amplitude ranges from (0, 1), and the processing unit is configured to: Differential amplitude of i elements

Mapping to the angle domain for quantization; when the amplitude value of the ith element is greater than the amplitude value of the ith-1th element, the processing unit is configured to: quantize the amplitude of the ith element Is 1. such as,

Optionally, the X _i is a complex number including amplitude and phase. When i ≠ N, the processing unit is configured to: quantize the phase of the ith element by using a multi-digit digital phase modulation MPSK.

Optionally, when the number of bits of the phase quantization allocated to the ith element is b, the quantized phase belongs to

j=0~2 ^b -1.

Optionally, when i≠N, the processing unit is configured to separately determine a number of bits occupied by the quantized value of the amplitude of the _i- th element, and quantize the phase of the i-th element. The number of bits occupied by the value N _i-phase , wherein when the N _{i is} less than a threshold, N _i-phase =N _i ; or, when the N _{i is} greater than or equal to a threshold, the N _i-amp and The N _i-phase is determined according to a certain ratio, where N _i-amp +N _i-phase =N _i .

Optional, said

N _i-amp =N _i -N _i-phase

0 < ω < 1, the ω is the ratio of N _i-phase and N _total .

Embodiment of the present invention is provided in a user equipment, determining a quantization values ₂ i-th element of the N number of bits occupied by W _i, at least the number of bits in the quantized values of the elements of the two W ₂ is not occupied by the same The accuracy of the reference can be improved, so that the accuracy of the CSI feedback can be improved.

Based on the same technical concept, the embodiment of the present invention provides a network device 400 for performing the method of the embodiment of the present invention. For related content, refer to the description of the method, which is not repeated here. The network device communicates with the user equipment device provided in the instinctive inventive embodiment. Among them, as shown in Figure 4:

The user equipment 400 includes: a receiving unit 401 and a processing unit 402. The processing unit may specifically be a processor, and the receiving unit may specifically be a receiver. Optionally, the user equipment may further include a sending unit 403, where the sending unit may be a transmitter.

The receiving unit is configured to receive a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a CSI codebook of each transport layer of the UE, and a CSI of each transport layer of the UE The quantized value of the codebook includes: a quantized value of the element X _i in the W ₂ ; and the quantized value of at least two of the elements in the W ₂ in the bit sequence occupy different numbers of bits. The codebook of the CSI of each transport layer of the UE can be referred to the previous description, and is not repeated here.

Optionally, the processing unit is further configured to determine, according to the determined quantization value, a codebook used by the UE, where A signal transmitted to the UE is encoded according to the codebook. The sending unit is configured to send the encoded signal to the UE. Optionally, the sending unit is configured to send a pilot to the UE, where the UE performs channel estimation.

Alternatively, the N-th element of the ₂ W W for the UE ₂ for the normalization of the reference, the N is equal to an integer greater than 1 less than or equal to K; when i = N, the N _i =0.

Optionally, when i≠N, the

Where ρ _i is the amplitude value of the ith element,

Optionally, when i≠N, the

among them,

Represents the largest integer not greater than x.

Alternatively, the X _i is a complex, including amplitude and phase, while when i ≠ N, the processing for determining the bit number are N _i-amp quantized value of the amplitude of the i-th element and occupies a quantized value of a phase of the i-th element occupies a number of bits N _i-phase ; a quantized value of an amplitude of the i-th element is a difference amplitude of the i-th element, a difference of the i-th element The amplitude is the ratio of the amplitude value ρ _i of the i-th element to the amplitude value ρ _i-1 of the _i-th element

Optionally, when the N _{i is} less than a threshold, N _i-phase =N _i ; or, when the N _{i is} greater than or equal to a threshold, the N _i-amp and the N _i-phase are according to Determined by a certain ratio, where N _i-amp +N _i-phase =N _i .

Optional,

N _i-amp =N _i -N _i-phase

0 < ω < 1, the ω is the ratio of N _i-phase and N _total .

Optionally, the quantized value of the amplitude of the ith element is

Embodiment of the present invention to provide a network device, determining a quantization values ₂ i-th element of the N number of bits occupied by W _i, at least the number of bits in the quantized values of the elements of the two W ₂ is not occupied by the same The accuracy of the reference can be improved, so that the accuracy of the CSI feedback can be improved.

The embodiment of the invention provides a communication system, which includes the user equipment and the network device provided by the embodiment of the invention.

Based on the same technical concept, the embodiment of the present invention provides a user equipment 500 for performing the method of the embodiment of the present invention. For related content, refer to the description of the method, which is not repeated here. FIG. 5 is a schematic structural diagram of hardware of a user equipment 500 according to an embodiment of the invention. As shown in FIG. 5, the user equipment 500 includes a processor 502, a transceiver 504, a plurality of antennas 506, a memory 508, an I/O (Input/Output) interface 510, and a bus 512. The transceiver 504 further includes a transmitter 5042 and a receiver 5044 for further storing instructions 5082 and data 5084. In addition, processor 502, transceiver 504, memory 508, and I/O interface 510 are communicatively coupled to one another via a bus 512, and a plurality of antennas 506 are coupled to transceiver 504.

The processor 502 can be a general-purpose processor, such as, but not limited to, a central processing unit (CPU), or a dedicated processor such as, but not limited to, a digital signal processor (DSP), an application. Application-Specific Integrated Circuit (ASIC) and Field Programmable Gate Array (FPGA). In addition, the processor 502 can also be multiple A combination of processors. The processor 502 is configured to perform a feedback method of the CSI provided by the embodiment of the present invention. The processor 502 can be a processor specifically designed to perform the operations and/or steps described above, and can also perform the operations and/or steps described above by reading and executing the instructions 5082 stored in the memory 508. Data 5084 may be required during the operation and/or steps.

The transceiver 504 includes a transmitter 5042 and a receiver 5044, wherein the transmitter 5042 is configured to transmit an uplink signal to the network device through at least one of the plurality of antennas 506. The receiver 5044 is configured to receive a downlink signal from the network device through at least one of the plurality of antennas 506. The transmitter 5042 is specifically configured to be executed by at least one of the plurality of antennas 506. The receiver 5044 is specifically configured to be executed by at least one of the plurality of antennas 506.

The memory 508 may be various types of storage media, such as a random access memory (RAM), a read-only memory (ROM), a non-volatile random access memory (Non-Volatile Random Access Memory, NVRAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), electrically erasable PROM (Electrically Erasable PROM, EEPROM), Flash memory, optical memory, registers, etc. The memory 508 is specifically configured to store instructions 5082 and data 5084, and the processor 502 can perform the operations and/or steps described above by reading and executing the instructions 5082 stored in the memory 508, performing the operations and/or steps described above. Data 5084 may be required in the process.

The I/O interface 510 is for receiving instructions and/or data from peripheral devices and outputting instructions and/or data to peripheral devices.

It should be noted that in the specific implementation process, the user equipment 500 may also include other hardware devices, which are not enumerated herein.

Based on the same technical concept, the embodiment of the present invention provides a network device 600, which is used to perform the method in the embodiment of the present invention. For related content, refer to the description of the method, which is not repeated here. FIG. 6 is a schematic diagram showing the hardware structure of a network device 600 according to an embodiment of the invention. As shown in FIG. 6, network device 600 includes a processor 602, a transceiver 604, a plurality of antennas 606, a memory 608, an I/O interface 610, and a bus 612. The transceiver 604 further includes a transmitter 6042 and a receiver 6044, the memory 608 further for storing instructions 6082 and data 6084. In addition, processor 602, transceiver 604, memory 608, and I/O interface 610 are communicatively coupled to each other via bus 612, and a plurality of antennas 606 are coupled to transceiver 604.

The processor 602 can be a general purpose processor such as, but not limited to, a CPU, or a dedicated processor such as, but not limited to, a DSP, an ASIC, an FPGA, and the like. Moreover, processor 602 can also be a combination of multiple processors. The processor 602 is configured to perform the method provided by the embodiment of the present invention. Processor 602 may be a processor specifically designed to perform the operations and/or steps described above, and may also perform the operations and/or steps described above by reading and executing instructions 6082 stored in memory 608, which processor 602 is performing Data 6084 may be required during the operation and/or steps.

The transceiver 604 includes a transmitter 6042 and a receiver 6044, wherein the transmitter 6042 is configured to transmit a downlink signal to the user equipment through at least one of the plurality of antennas 606. The receiver 6044 is configured to receive an uplink signal from the user equipment through at least one of the plurality of antennas 606. The transmitter 6042 is specifically configured to be executed by at least one of the plurality of antennas 606. The receiver 6044 is specifically configured to be executed by at least one of the plurality of antennas 606.

The memory 608 can be various types of storage media such as RAM, ROM, NVRAM, PROM, EPROM, EEPROM, flash memory, optical memory, and registers, and the like. The memory 608 is specifically configured to store instructions 6082 and data 6084, and the processor 602 can perform the operations and/or steps described above by reading and executing the instructions 6082 stored in the memory 608, performing the operations and/or steps described above. Data 6084 may be required during the process.

The I/O interface 610 is configured to receive instructions and/or data from peripheral devices and to output instructions and/or data to peripheral devices.

It should be noted that in a specific implementation process, the network device 600 may also include other hardware devices, which are not enumerated herein.

A person skilled in the art may know that all or part of the above steps may be completed by hardware related to program instructions, and the program may be stored in a computer readable storage medium such as a ROM, a RAM, an optical disc, or the like. .

In conclusion, the above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A method for feeding back channel state information CSI, comprising:

Determining a codebook of CSI of each transport layer of the user equipment UE, where the codebook of the CSI of each transport layer of the UE is:

W=W 1 ×W 2 ,

Wherein W is the CSI UE codebook for each transport layer; W 1 is the present one yard, W 1 = [b 1 b 2 ... b K], in the W. 1 b i represents a codeword; wherein K is the number of columns of said W is 1, K is a positive integer greater than or equal to 1; W 2 for the two codebooks, the W 2 is represented as: W 2 = [X 1 X 2 ... X K] T, where the elements 2 W X i corresponding to the respective codeword W is a weighting coefficient; the i is an integer greater than or equal to 1 less than the K;

Determining a quantization step in the i-th element 2 of the number of bits occupied by W N i, at least the number of bits of the quantized values of the elements in the two occupied by W 2 are not the same;

According to the quantized value of said N i i-th feedback element to the network device.
A method for feeding back channel state information CSI, comprising:

Determining a codebook of CSI of each transport layer of the user equipment UE, where the codebook of the CSI of each transport layer of the UE is:

W=W 1 ×W 2 ,

Wherein W is the CSI codebook for each UE the transport layer; W 1 is the present one yard, W. 1 is represented as W 1 = [p 1 b 1 p 2 b 2 ... p K b K ], wherein K is the number of columns of the W 1 , the K is a positive integer greater than or equal to 1, b i in the W 1 represents a codeword, and p i represents amplitude weight information of the corresponding codeword, 0 ≤ p i ≤ 1, p 1 =1; the W 2 is a secondary codebook, and the W 2 is expressed as: W 2 = [X 1 X 2 ... X K ] T , wherein the W 2 The element X i is a weighting coefficient corresponding to each code word in the W 1 ; the i is an integer greater than or equal to 1 and less than or equal to K;

Determining a quantization step in the i-th element 2 of the number of bits occupied by W N i, at least the number of bits of the quantized values of the elements in the two occupied by W 2 are not the same;

According to the quantized value of said N i i-th feedback element to the network device.
The method of claim 1 or 2, further comprising:

Normalizing the W 2 according to the Nth element in the W 2 , wherein the N is an integer greater than or equal to 1 and less than or equal to K;

The determining the number of bits N i occupied by the quantized value of the ith element in the W 2 includes:

When i=N, N i =0.
The method according to claim 3, wherein the determining the number of bits N i occupied by the quantized value of the ith element in the W 2 comprises:

When i ≠ N, the value of N i is positively correlated with the amplitude value of the ith element.
The method according to any of claims 3-4, wherein the value of N is a value pre-agreed by the UE and the network device.
The method of claim 4 wherein said N is equal to 1 or K.
A method according to any one of claims 3-6, wherein when i≠N, said

Where ρ i is the amplitude value of the ith element,
Represents the largest integer not greater than x,

The N total is the number of bits occupied by the quantized values of all elements of the W 2 .
A method according to any one of claims 3-6, wherein when i≠N, said

Where N base is the occupied basic number of bits of the quantized value of the i-th element, and N add,i is the number of additional bits occupied by the quantized value of the i-th element.
The method according to any one of claims 3-8, wherein the X i is a complex number including amplitude and phase, and when i ≠ N, further comprising:

Quantifying the amplitude of the ith element;

The quantizing the amplitude of the ith element includes: quantizing the ith element differential magnitude, the differential amplitude of the ith element being the amplitude value ρ i of the ith element and the ith The ratio of the amplitude value ρ i-1 of the -1 element
The method according to any one of claims 3-9, wherein when i≠N, further comprising:

Respectively determining the number of bits N i-phase value of the quantization bit number N i-amp and the phase of the i-th element of quantized values of the amplitude of the i-th element occupied occupied, wherein, when said N i is less than At a threshold, N i-phase =N i ; or,

When the N i is greater than or equal to a threshold, the N i-amp and the N i-phase are determined according to a certain ratio, where N i-amp +N i-phase =N i .
The method of claim 10 wherein said said

N i-amp =N i -N i-phase

0 < ω < 1, the ω is the ratio of N i-phase and N total .
The method of claim 1 or 2, further comprising:

Normalizing the W 2 according to the Nth element in the W 2 , wherein the N is an integer greater than or equal to 1 and less than or equal to K;

The determining the number of bits N i occupied by the quantized value of the ith element in the W 2 includes:

When i=1, X 1 =1 and N 1 =0.
A method for receiving channel state information, comprising:

The network device receives a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE, and a codebook of a CSI of each transport layer of the UE is:

W=W 1 ×W 2 ,

Wherein W is the CSI UE codebook for each transport layer; W 1 is the present one yard, W 1 = [b 1 b 2 ... b K], in the W. 1 b i represents a codeword; wherein K is the number of columns of said W is 1, K is a positive integer greater than or equal to 1; W 2 for the two codebooks, the W 2 is represented as: W 2 = [X 1 X 2 ... X K] T, where the elements 2 W X i corresponding to the respective codeword W is a weighting coefficient; the i is an integer greater than or equal to 1 less than the K; for the UE CSI codebook quantized values of each transport layer comprising: quantization values of the elements in the W X i 2; and the bit sequence of at least the number of bits of the quantized values of the elements in the two occupied by W 2 Not the same;

Determining, by the network device, the number of bits N i occupied by the quantized value of the i th element in the W 2 ;

The network device i-th element value quantization according to a bit sequence from the received N i in the extract.
A method for receiving channel state information, comprising:

The network device receives a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE, and a codebook of a CSI of each transport layer of the UE is:

W=W 1 ×W 2 ,

Wherein W is the CSI codebook for each UE the transport layer; W 1 is the present one yard, W. 1 is represented as W 1 = [p 1 b 1 p 2 b 2 ... p K b K ], wherein K is the number of columns of the W 1 , the K is a positive integer greater than or equal to 1, b i in the W 1 represents a codeword, and p i represents amplitude weight information of the corresponding codeword, 0 ≤ p i ≤ 1, p 1 =1; W 2 is a secondary codebook, and W 2 is expressed as: W 2 = [X 1 X 2 ... X K ] T , wherein the elements in the W 2 X i is a weighting coefficient corresponding to each code word in the W 1 ; the i is an integer greater than or equal to 1 and less than or equal to K; the quantized value of the CSI codebook of each transport layer of the UE includes: a quantized value of the element X i in 2 ; the quantized value of at least two of the elements in the W 2 occupying a different number of bits;

Determining, by the network device, the number of bits N i occupied by the quantized value of the i th element in the W 2 ;

The network device i-th element value quantization according to a bit sequence from the received N i in the extract.
The method of claim 13 or claim 14, wherein the N elements 2 of the UE, W is the W 2 the reference normalizing process, wherein N is less than 1 or greater An integer equal to K;

The determining the number of bits N i occupied by the quantized value of the ith element in the W 2 includes:

When i=N, N i =0;

The total number of bits of the quantized value of K-1 of 2 elements in addition to the N-th element of W outer occupied amount of the value W 2 is the number of bits occupied by the N total.
The method according to claim 15, wherein the determining the number of bits N i occupied by the quantized value of the ith element in the W 2 comprises:

When i ≠ N, the value of N i is positively correlated with the amplitude value of the ith element.
The method according to any of claims 15-16, wherein the value of N is a value pre-agreed by the UE and the network device.
The method of claim 17 wherein said N is equal to 1 or K.
A method according to any one of claims 15 to 18, wherein when i≠N, said

Where ρ i is the amplitude value of the ith element,
Represents the largest integer not greater than x,

The N total is the number of bits occupied by the quantized values of all elements of the W 2 .
A method according to any one of claims 15 to 18, wherein when i≠N, said

Where N base is the occupied basic number of bits of the quantized value of the i-th element, and N add,i is the number of additional bits occupied by the quantized value of the i-th element.
The method according to any one of claims 15 to 20, wherein the X i is a complex number including amplitude and phase, and when i ≠ N, further comprising: the network device respectively determining the ith The number of bits occupied by the quantized value of the amplitude of the element N i-amp and the quantized value of the phase of the i-th element occupy the number of bits N i-phase ;

a quantized value of the amplitude of the i-th element is a quantized value of a differential amplitude of the i-th element, and a differential amplitude of the i-th element is an amplitude value ρ i and an i-th of the i-th element The ratio of the amplitude value ρ i-1 of the -1 element
The method of claim 21 wherein

When the N i is less than a threshold, N i-phase =N i ; or,

When the N i is greater than or equal to a threshold, the N i-amp and the N i-phase are determined according to a certain ratio, where N i-amp +N i-phase =N i .
The method of claim 22 wherein said said

N i-amp =N i -N i-phase

0 < ω < 1, the ω is the ratio of N i-phase and N total .
The method of claim 13 or claim 14, wherein the N elements 2 of the UE, W is the W 2 the reference normalizing process, wherein N is less than 1 or greater An integer equal to K;

The determining the number of bits N i occupied by the quantized value of the ith element in the W 2 includes:

When i=1, X 1 =1, and N 1 =0;

The total number of bits of the quantized value of K-1 of 2 elements in addition to the N-th element of W outer occupied amount of the value W 2 is the number of bits occupied by the N total.
A user equipment (UE), comprising:

a processing unit, configured to determine a codebook of a CSI of each transport layer of the UE, where a codebook of a CSI of each transport layer of the UE is:

W=W 1 ×W 2 ,

Wherein W is the CSI UE codebook for each transport layer; W 1 is the present one yard, W 1 = [b 1 b 2 ... b K], in the W. 1 b i represents a codeword; wherein K is the number of columns of said W is 1, K is a positive integer greater than or equal to 1; W 2 for the two codebooks, the W 2 is represented as: W 2 = [X 1 X 2 ... X K] T, where the elements 2 W X i corresponding to the respective codeword W is a weighting coefficient; the i is an integer greater than or equal to 1 less than the K;

The processing unit is further configured to determine the quantized values 2 i-th element of the N number of bits occupied by W i, at least the number of bits of the quantized values of the elements in the two occupied by W 2 are not the same;

Transmission means for the quantized values according to said N i i-th element of the feedback to the network device.
A user equipment (UE), comprising:

a processing unit, configured to determine a codebook of a CSI of each transport layer of the UE, where a codebook of a CSI of each transport layer of the UE is:

W=W 1 ×W 2 ,

Wherein W is the CSI codebook for each UE the transport layer; W 1 is the present one yard, W. 1 can be expressed as W 1 = [p 1 b 1 p 2 b 2 ... p K b K ], wherein K is the number of columns of the W 1 , the K is a positive integer greater than or equal to 1, b i in the W 1 represents a codeword, and p i represents amplitude weight information of the corresponding codeword , 0 ≤ p i ≤ 1, p 1 =1; W 2 is a secondary codebook, and the W 2 is expressed as: W 2 = [X 1 X 2 ... X K ] T , wherein the W 2 The element X i is a weighting coefficient corresponding to each code word in the W 1 ; the i is an integer greater than or equal to 1 and less than or equal to K;

The processing unit is further configured to determine the quantized values 2 i-th element of the N number of bits occupied by W i, at least the number of bits of the quantized values of the elements in the two occupied by W 2 are not the same;

Transmission means for the quantized values according to said N i i-th element of the feedback to the network device.
The apparatus of claim 25 or claim 26, wherein said processing unit is further configured to normalize the W 2 W 2 in accordance with the first N elements, where N is the An integer greater than or equal to 1 less than or equal to K; when i=N, N i =0.
The apparatus as claimed in claim 27, characterized in that, when i ≠ N, the value of N i n the amplitude values associated with the i-th element.
The device of any of claims 27-28, wherein the value of N is a value pre-agreed by the UE and the network device.
The apparatus of claim 24 wherein said N is equal to 1 or K.
Apparatus according to any of claims 25-30, wherein when i≠N, said

Where ρ i is the amplitude value of the ith element,
Represents the largest integer not greater than x,

The N total is the number of bits occupied by the quantized values of all elements of the W 2 .
Apparatus according to any of claims 27-30, wherein when i≠N, said

Where N base is the occupied basic number of bits of the quantized value of the i-th element, and N add,i is the number of additional bits occupied by the quantized value of the i-th element.
The apparatus according to any one of claims 27 to 32, wherein said X i is a complex number including amplitude and phase, and when i ≠ N, said processing unit: further for said ith The magnitude of the elements is quantified;

When the amplitude of the i-th element is quantized, the processing unit is configured to quantize the i-th element differential amplitude, and the differential amplitude of the i-th element is an amplitude value ρ i of the i-th element Ratio of the amplitude value ρ i-1 to the i- 1th element
Apparatus according to any of claims 27-33, wherein when i≠N,

The processing unit is configured to respectively determine a number of bits occupied by the quantized value of the amplitude of the i- th element and a number of bits occupied by the quantized value of the phase of the i-th element, N i-phase , Wherein, when the N i is less than a threshold, N i-phase =N i ; or,

When the N i is greater than or equal to a threshold, the N i-amp and the N i-phase are determined according to a certain ratio, where N i-amp +N i-phase =N i .
The device according to claim 34, wherein said said

N i-amp =N i -N i-phase

0 < ω < 1, the ω is the ratio of N i-phase and N total .
The apparatus of claim 25 or claim 26, wherein said processing unit is further configured to normalize the W 2 W 2 in accordance with the first N elements, where N is the An integer greater than or equal to 1 less than or equal to K; when i=1, X 1 =1, and N 1 =0.
A network device, comprising:

a receiving unit, configured to receive a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE, where a codebook of a CSI of each transport layer of the UE is :

W=W 1 ×W 2 ,

Wherein W is the CSI UE codebook for each transport layer; W 1 is the present one yard, W 1 = [b 1 b 2 ... b K], in the W. 1 b i represents a codeword; wherein K is the number of columns of said W is 1, K is a positive integer greater than or equal to 1; W 2 for the two codebooks, the W 2 is represented as: W 2 = [X 1 X 2 ... X K] T, where the elements 2 W X i corresponding to the respective codeword W is a weighting coefficient; the i is an integer greater than or equal to 1 less than the K; for the UE CSI codebook quantized values of each transport layer comprising: quantization values of the elements in the W X i 2; and the bit sequence of at least the number of bits of the quantized values of the elements in the two occupied by W 2 Not the same;

The processing unit for determining the quantized value W 2 of the i-th element of occupied bits N i; for extracting the i-th element of the bit string from the received N i in Quantitative value.
A network device, comprising:

a receiving unit, configured to receive a bit sequence sent by the user equipment UE, where the bit sequence includes a quantized value of a codebook of a CSI of each transport layer of the UE, where a codebook of a CSI of each transport layer of the UE is :

W=W 1 ×W 2 ,

Wherein W is the CSI codebook for each UE the transport layer; W 1 is the present one yard, W. 1 is represented as W 1 = [p 1 b 1 p 2 b 2 ... p K b K ], wherein K is the number of columns of the W 1 , the K is a positive integer greater than or equal to 1, b i in the W 1 represents a codeword, and p i represents amplitude weight information of the corresponding codeword, 0 ≤ p i ≤ 1, p 1 =1; W 2 is a secondary codebook, and W 2 is expressed as: W 2 = [X 1 X 2 ... X K ] T , wherein the elements in the W 2 X i is a weighting coefficient corresponding to each code word in the W 1 ; the i is an integer greater than or equal to 1 and less than or equal to K; the quantized value of the CSI codebook of each transport layer of the UE includes: a quantized value of the element X i in 2 ; the quantized value of at least two of the elements in the W 2 occupying a different number of bits;

The processing unit for determining the quantized value W 2 of the i-th element of occupied bits N i; for extracting the i-th element of the bit string from the received N i in Quantitative value.
Apparatus 37 or as claimed in claim 38, wherein the N elements 2 of the UE, W is the W 2 the reference normalizing process, wherein N is less than 1 or greater An integer equal to K;

When i=N, N i =0.
The apparatus according to claim 39, wherein, when i ≠ N, said value of N i is positively correlated with an amplitude value of said i-th element.
The device of any of claims 39-40, wherein the value of N is a value pre-agreed by the UE and the network device.
The apparatus of claim 41 wherein said N is equal to 1 or K.
Apparatus according to any of claims 39-42, wherein when i≠N, said

Where ρ i is the amplitude value of the ith element,
Denotes the maximum integer not greater than x, the number of bits of the N quantized values of all the elements of the W 2 occupied by total.
Apparatus according to any of claims 39-42, wherein when i≠N, said

Where N base is the occupied basic number of bits of the quantized value of the i-th element, and N add,i is the number of additional bits occupied by the quantized value of the i-th element.
Device according to any one of claims 39-44, wherein the X i is a complex, including amplitude and phase, while when i ≠ N, the processing for determining each of the i-th element The number of bits occupied by the quantized value of the amplitude N i-amp and the quantized value of the phase of the i-th element occupy the number of bits N i-phase ;

a quantized value of the amplitude of the i-th element is the i-th element differential amplitude, and a difference amplitude of the i-th element is an amplitude value ρ i of the i-th element and an i-1th element Ratio of amplitude values ρ i-1
A device according to any of claims 45, wherein

When the N i is less than a threshold, N i-phase =N i ; or,

When the N i is greater than or equal to a threshold, the N i-amp and the N i-phase are determined according to a certain ratio, where N i-amp +N i-phase =N i .
The device according to claim 46, wherein said said

N i-amp =N i -N i-phase

0 < ω < 1, the ω is the ratio of N i-phase and N total .
37 or apparatus according to claim 38, wherein the N elements 2 of the UE, W is the W 2 the reference normalizing process, wherein N is less than 1 or greater An integer equal to K;

When i=1, X 1 =1 and N 1 =0.