CN106033990A - Channel state information feedback method, channel state information obtaining method and devices - Google Patents

Abstract

The invention discloses a channel state information feedback method, a channel state information obtaining method and devices. he channel state information feedback method comprises: a terminal obtains a transformation precoding matrix related to a downlink channel state of the terminal; the terminal obtains a downlink channel estimation value according to the transformation pre-coding matrix and measurement to obtain equivalent downlink channel information; the transformation pre-coding matrix converts channel estimation values of at least one set of antenna port channels to equivalent downlink information of one equivalent antenna port; and the terminal performs the channel state information feedback according to the obtained equivalent downlink channel information. The channel state information feedback method, the channel state information obtaining method and the device scan realize feedback and acquisition of the channel state information.

Description

A kind of channel state information feedback method, acquisition methods and device

Technical field

The present invention relates to wireless communication field, particularly relate to a kind of channel state information feedback method, acquisition side Method and device.

Background technology

LTE Rel-8 (Long Term Evolution Release-8, Long Term Evolution version 8) system introduces and closes Ring precoding technique is to improve spectrum efficiency.The requirement of closed loop precoding technique all preserves same in base station and end side The set of one pre-coding matrix, referred to as code book.After terminal estimates channel information according to cell common pilots, From code book, a pre-coding matrix is selected by certain criterion.The criterion chosen can be to maximize mutual information Amount, maximization output Signal to Interference plus Noise Ratio etc..Terminal by the pre-coding matrix selected index in the codebook by upper Row channel feedback is to base station, and this index is designated as PMI (Precoding Matrix Indicator, pre-coding matrix Instruction).Base station determines the pre-coding matrix using this terminal according to the PMI received.Terminal to report pre- Encoder matrix can be regarded as the quantized value of channel condition information.

In existing cellular system, base-station antenna array is typically horizontally arranged, as depicted in figs. 1 and 2. Transmission end of base station wave beam is only capable of being adjusted in the horizontal direction, and vertical direction is fixing angle of declination, respectively Kind wave beam forming and precoding technique etc. are based on horizontal direction channel information to be carried out.Owing to wireless signal exists Being three-dimensional propagation in space, the method for fixing angle of declination can not make the performance of system reach optimum.Vertical Square To wave beam adjust for reduce presence of intercell interference, improve systematic function have critically important meaning.

Along with the development of antenna technology, industry goes out the active antenna being now able to independently control each a period of time, As shown in Figure 3 and Figure 4.Use this aerial array so that wave beam becomes in dynamically adjusting of vertical direction May.Realize wave beam forming and the precoding technique of three-dimensional, need to rely on the channel status of terminal to report Information.But, currently for this aerial array, not yet have preferable information feedback and acquisition Scheme.

Summary of the invention

Embodiments provide a kind of channel state information feedback method, acquisition methods and device, in order to Realize feedback and the acquisition of channel condition information.

The channel state information feedback method that the embodiment of the present invention provides, the method includes:

Terminal obtains the conversion pre-coding matrix relevant to the downlink channel condition of described terminal；

The down channel estimated value that described terminal obtains according to described conversion pre-coding matrix and measurement, it is thus achieved that Equivalence descending channel information；Wherein, the channel of least one set antenna port is estimated by described conversion pre-coding matrix Evaluation is transformed to the equivalent descending channel information of 1 equivalent aerial port；

Described terminal carries out information feedback according to the equivalent descending channel information of described acquisition.

The channel state information acquisition method that the embodiment of the present invention provides, including:

The network equipment sends the reference signal for carrying out channel condition information measurement；

The described network equipment receives the first channel condition information that terminal is fed back, institute according to described reference signal Stating the first channel condition information is that described terminal is according to the conversion relevant to the downlink channel condition of described terminal Pre-coding matrix and the down channel estimated value obtained according to described reference signal measurement obtain；Wherein, The channel estimation value of the least one set antenna port of the described network equipment is converted by described conversion pre-coding matrix It it is the equivalent descending channel information of 1 equivalent aerial port；

The described network equipment is made according to the first channel condition information and the described terminal of described terminal feedback Conversion pre-coding matrix, determine and described terminal carried out data transmission used pre-coding matrix.

The terminal that the embodiment of the present invention provides, including:

First acquisition module, for obtaining the conversion precoding square relevant to the downlink channel condition of described terminal Battle array；

Second acquisition module, estimates for the down channel obtained according to described conversion pre-coding matrix and measurement Evaluation, it is thus achieved that equivalence descending channel information；Wherein, described conversion pre-coding matrix is by least one set antenna end The channel estimation value of mouth is transformed to the equivalent descending channel information of 1 equivalent aerial port；

Feedback module, anti-for carrying out channel condition information according to the equivalent descending channel information of described acquisition Feedback.

The network equipment that the embodiment of the present invention provides, including:

Sending module, for sending the reference signal for carrying out channel condition information measurement；

Receiver module, for receiving the first channel condition information that terminal is fed back according to described reference signal, Described first channel condition information is that described terminal is according to the change relevant to the downlink channel condition of described terminal Change pre-coding matrix and the down channel estimated value that obtains according to described reference signal measurement obtains；Its In, the channel estimation value of the least one set antenna port of the described network equipment is become by described conversion pre-coding matrix It is changed to the equivalent descending channel information of 1 equivalent aerial port；

Determine module, for being made according to the first channel condition information and the described terminal of described terminal feedback Conversion pre-coding matrix, determine and described terminal carried out data transmission used pre-coding matrix.

In the above embodiment of the present invention, terminal is pre-according to the conversion relevant to the downlink channel condition of this terminal Encoder matrix, and measure the down channel estimated value obtained, it is thus achieved that equivalence descending channel information, and according to The equivalent descending channel information of described acquisition carries out information feedback, it is achieved that channel condition information is anti- The purpose of feedback.On the other hand, owing to conversion pre-coding matrix is relevant to the downlink channel condition of terminal, But independent with interference and noise, therefore based on this conversion pre-coding matrix, the down channel of this terminal is estimated The signal to noise ratio of the down channel of this terminal can be improved after value conversion.

Accompanying drawing explanation

Fig. 1 is dual polarized antenna schematic diagram horizontally arranged in prior art；

Fig. 2 is linear array antenna schematic diagram horizontally arranged in prior art；

Fig. 3 is the dual polarized antenna schematic diagram of horizontal and vertical two-dimensional arrangements in prior art；

Fig. 4 is the linear array antenna schematic diagram of horizontal and vertical two-dimensional arrangements in prior art；

The information feedback schematic flow sheet that Fig. 5 provides for the embodiment of the present invention；

The antenna port packet schematic diagram that Fig. 6 to Fig. 9 is respectively in the embodiment of the present invention；

The channel condition information that Figure 10 provides for the embodiment of the present invention obtains schematic flow sheet；

The structural representation of the terminal that Figure 11 provides for the embodiment of the present invention；

The structural representation of the network equipment that Figure 12 provides for the embodiment of the present invention；

The structural representation of the terminal that Figure 13 provides for another embodiment of the present invention；

The structural representation of the network equipment that Figure 14 provides for another embodiment of the present invention.

Detailed description of the invention

As stated in the Background Art, due to three-dimensional wave beam forming and precoding technique, need to rely in terminal The channel condition information of report.A kind of possible being achieved in that has had been used up since continuing to use LTE Rel-8 system Reporting schemes based on code book.

But there are the following problems for this reporting schemes:

1. the antenna element of three-dimensional wave beam forming uses the active antenna that each a period of time independently controls, antenna Power amplifier integrates with antenna port.In the case of antenna element large number, each antenna element Launch power the lowest.If used conventional methods, each antenna element sends a pilot signal, its Penetrating power will be the lowest, and distance base station is farther out or the relatively low terminal of signal to noise ratio possibly cannot realize correct letter Road is estimated, carries out affecting the accuracy of information feedback.

In the case of the most each antenna element sends a pilot signal, when antenna element number is bigger, terminal needs Carry out substantial amounts of channel estimate computing, it is achieved complexity the highest, it is difficult to realize.

For the problems referred to above, embodiments provide feedback and the acquisition side of a kind of channel condition information Case.In the embodiment of the present invention, terminal is according to the conversion precoding square relevant to the downlink channel condition of this terminal Battle array, and measure the down channel estimated value obtained, it is thus achieved that equivalence descending channel information, and obtain according to described The equivalent descending channel information obtained carries out information feedback, it is achieved that the mesh of information feedback 's.Due to conversion pre-coding matrix be relevant to the downlink channel condition of terminal, but with disturb and noise Independent, can improve after therefore the down channel estimated value of this terminal being converted based on this conversion pre-coding matrix The signal to noise ratio of the down channel of this terminal.

It should be noted that the embodiment of the present invention is described with antenna element, described antenna element uses Being the active antenna independently controlled in each a period of time, antenna power amplifier integrates with antenna port.Other forms Antenna element can also use this programme.Assume that each antenna element has corresponding Transmit Receive Unit (TXRU), i.e. TXRU is to being to map one by one between antenna element.If a TXRU is mapped to many Individual antenna element, then an antenna element described in the embodiment of the present invention represents the one of a TXRU mapping Group antenna element.

The embodiment of the present invention is applied to FDD MIMO, and (Multi-Input Multi-Output, multi input is many Output) system or TDD (Time Division Duplexing, time division duplex) mimo system, can solve The certainly problem of information feedback.

In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to this Bright it is described in further detail, it is clear that described embodiment is only some embodiments of the present invention, Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing Go out all other embodiments obtained under creative work premise, broadly fall into the scope of protection of the invention.

Be described below be the present invention multiple embodiments in some, it is desirable to provide basic to the present invention Understand, it is no intended to confirm the crucial or decisive key element of the present invention or limit scope of the claimed.According to Technical scheme, under the connotation not changing the present invention, can mutually replace and obtain other Implementation.

See Fig. 5, the information feedback schematic flow sheet provided for the embodiment of the present invention.This flow process Realize in end side.As it can be seen, this flow process can comprise the steps:

Step 501, terminal obtain the conversion pre-coding matrix relevant to the downlink channel condition of described terminal.

The down channel that step 502, described terminal obtain according to described conversion pre-coding matrix and measurement is estimated Evaluation, it is thus achieved that equivalence descending channel information；Wherein, described conversion pre-coding matrix is by least one set antenna end The channel estimation value of mouth is transformed to the equivalent descending channel information of 1 equivalent aerial port；

Step 503, described terminal carry out channel condition information according to the equivalent descending channel information of described acquisition Feedback.

The embodiment of the present invention is described according to the corresponding antenna port of an antenna element.Actual application Time, it is also possible to be the corresponding antenna port of multiple antenna element, it is achieved method identical, repeat no more.

Further, terminal also can obtain the antenna port grouping information of the network equipment.Terminal can be according to net The configuration information that network equipment sends obtains the antenna port grouping information of this network equipment.The antenna of the network equipment Port grouping information is also to make an appointment, well known for this network equipment and terminal.

The packet mode of the antenna port of the network equipment may is that and N number of antenna port is divided into K group, often The quantity of group antenna port is identical or different, N and K is the integer more than or equal to 1.Wherein, every string Antenna port can be divided into one group, or, every a line antenna port can be divided into one group；Or, every string In antenna port, all or part antenna port of the first polarised direction can be divided into one group, the second polarised direction All or part antenna port can be divided into another group.

For example, the packet mode of concrete antenna port may include that and N number of antenna port is divided into K Group, often P antenna port of group, P is the integer more than or equal to 1.Assume often to organize the number phase of antenna port With, if the number of antenna port is different, its processing procedure is identical with method, repeats no more.Such as, right In the aerial array of horizontal and vertical two-dimensional arrangements, each array antenna port can be divided into one group, such as Fig. 6 Shown in, or every a line antenna port is divided into one group, as shown in Figure 7.Horizontal and vertical two dimension is arranged The dual polarized antenna of row, can divide all antenna ports in an array antenna equipolarization direction into one group, i.e. One array antenna is divided into two groups according to polarised direction, as shown in Figure 8；Can also be by an array antenna equipolarization The some antennas port in direction divides one group into, and such as one array antenna is divided into four groups according to polarised direction, Fig. 9 Shown in.

The antenna port grouping information of the network equipment can be carried out in step 501 and/or step 502 by terminal Application, particular content can be found in subsequent descriptions.

In the step 501 of above-mentioned flow process, terminal can obtain the down channel with this terminal in several ways The conversion pre-coding matrix that state is relevant, the most exemplarily only enumerates two ways: mode A1 and mode A2。

Mode A1: the configuration information sent by the network equipment obtains the downlink channel condition phase with this terminal The conversion pre-coding matrix closed

In aforesaid way A1, the network equipment, such as base station, configuration information can be sent to terminal, pass through This configuration information indicates the conversion pre-coding matrix relevant to the downlink channel condition of this terminal to terminal.Network The described configuration information that equipment is sent, can be that other equipment (such as network management device) configure, Can also be that this network equipment obtains by sending downlink reference signal the feedback of measuring according to terminal.Institute State the described configuration information that terminal sends according to the network equipment, it is thus achieved that with the downlink channel condition phase of described terminal The conversion pre-coding matrix closed.

Wherein, described configuration information can by high-level signaling or by dispatch described terminal carry out data transmission DCI (Downlink Control Information, Downlink Control Information) be sent to described terminal.

In aforesaid way A1, terminal can be indicated to by PMI to the conversion precoding indicated by terminal.Eventually The conversion precoding square in conversion pre-coding matrix set, and this set is provided with in advance on end and the network equipment Battle array is well known for terminal and the network equipment with the corresponding relation of PMI, such as, and conversion precoding of can making an appointment Matrix and the corresponding relation of PMI, it is also possible to notified to terminal by the network equipment.So, terminal is according to being somebody's turn to do PMI can obtain the conversion pre-coding matrix of correspondence from this conversion pre-coding matrix set.

Wherein, it can also be N number of for can being one to the PMI indicated by terminal, and N is whole more than 1 Number.If being one to the PMI indicated by terminal, then the corresponding conversion pre-coding matrix collection of this PMI A conversion pre-coding matrix in conjunction；If being N number of to the PMI indicated by terminal, then this N number of PMI In each PMI correspondence pre-coding matrix set in a pre-coding matrix, corresponding pre-of different PMI Encoder matrix belongs to identical or different pre-coding matrix set, and described terminal is according to described N number of PMI pair The N number of pre-coding matrix answered determines conversion pre-coding matrix.Such as, conversion pre-coding matrix is by two code words (element in pre-coding matrix set is referred to as code word) determines, the two code word may belong to identical Code book or different code books (pre-coding matrix collection is collectively referred to as code book).Terminal receives the two of base station configuration After the PMI of individual code word, determine its each self-corresponding code word, be designated as matrix V 1 and matrix V 2 respectively, Terminal obtains after V1 and matrix V 2 are carried out computing converting pre-coding matrix, such as, run according to following To converting pre-coding matrix V:OrWherein,Transport for Kronecker product Calculate.

Index coded system in view of the pre-coding matrix in pre-coding matrix set is varied, Yi Zhongke The situation of energy is to indicate a pre-coding matrix in a set, such as, the code in code book with multiple PMI The index information two-dimensional array of word represents, so, a code word needs 2 PMI to indicate.Phase Ying Di, as one embodiment of the present of invention, the network equipment can be multiple to the PMI indicated by terminal, A conversion pre-coding matrix in the corresponding conversion pre-coding matrix set of the plurality of PMI.

Certainly, the network equipment can also be this conversion precoding square to the conversion pre-coding matrix indicated by terminal The concrete value of battle array, i.e. the value of each element in pre-coding matrix.

Preferably, the network equipment can indicate the packet of all antenna ports to share by described configuration information to terminal Conversion pre-coding matrix, it is also possible to the conversion indicating the packet of each antenna port corresponding respectively to terminal prelists Code matrix.Concrete indicating means can be found in foregoing description.

Mode A2: measure acquisition by the down channel of terminal relevant to the downlink channel condition of this terminal Conversion pre-coding matrix

In aforesaid way A2, the descending channel information that terminal obtains according to measurement, determine conversion precoding Matrix.Wherein, terminal can measure according to the downlink reference signal sending all antenna ports, root Obtain the conversion pre-coding matrix of correspondence according to measurement result, this conversion pre-coding matrix can be all antenna ports Packet is shared.Terminal can also for often organize antenna port measure respectively obtain correspondence conversion precoding square Battle array.

For latter event, specifically, terminal for often organize antenna port measure respectively obtain correspondence Conversion pre-coding matrix.Such as, terminal can be according to the descending channel information that obtain of measurement, according to capacity Big or receive prominent principle or according to the descending arrival angle Selection conversion precoding square estimated Battle array.Usually, terminal can obtain this pre-coding matrix, such as to one according to the descending channel information of statistics (such as the channel that horizontal antenna is corresponding is correlated with after the channel information that a little antenna ports are corresponding carries out statistical average Matrix is averaged) channel information that obtains, or when descending channel information is carried out long after statistical average The channel information arrived, calculates this conversion pre-coding matrix.

In the step 502 of above-mentioned flow process, terminal determine equivalence descending channel information process can include as Lower step:

Terminal carries out downlink channel condition information according to the reference signal being used for carrying out channel condition information measurement Measure, it is thus achieved that down channel estimated value, such as, LS (least square) channel estimation method can be used to obtain Obtain down channel estimated value.The described reference signal for carrying out channel condition information measurement can be CSI-RS (Channel State Information Reference Signal, channel state information reference signals) or CRS (Cell-specific Reference Signal, cell reference signals), or other is used for carrying out letter The reference signal that channel state information is measured, this is not restricted by the embodiment of the present invention.Described terminal is according to Described down channel estimated value is converted by the conversion pre-coding matrix acquired, it is thus achieved that conversion channel is estimated Value；The described conversion channel estimation value acquired is filtered obtaining equivalence down channel letter by described terminal Breath.

In prior art, after terminal estimates the LS channel estimation value of each antenna port, will Channel for each antenna port carries out the filtering of time domain and frequency domain.In the feelings that the number of antennas of base station is more Under condition, this filtering operation will expend substantial amounts of system resource.But in embodiments of the present invention, terminal is only Equivalent channel after being required for conversion is filtered, and the dimension of operation is substantially reduced, thus reduces terminal The complexity realized and power consumption.

Preferably, in the step 502 of above-mentioned flow process, terminal can be carried out based on antenna port packet The determination of effect descending channel information.

Specifically, terminal according to described conversion pre-coding matrix, the K group antenna port to the network equipment respectively Corresponding down channel estimated value is weighted merging, and obtains K group conversion channel estimation value, then to described K group conversion channel estimation value is filtered, and obtains K group equivalence descending channel information.

Wherein, the packet of each antenna port can use identical conversion pre-coding matrix to enter channel estimation value Line translation, different antenna port packets can also use different conversion pre-coding matrixes to channel estimation value Convert.It has been respectively configured a conversion precoding square if the network equipment is each antenna port Battle array, then terminal can be with the conversion pre-coding matrix of each antenna port packet to this antenna port packet correspondence Channel estimation results convert.If terminal is to obtain converting precoding square by measurement down channel Battle array, as it was previously stated, terminal can measure respectively for the packet of each antenna port is calculated conversion in advance Encoder matrix, this antenna port can be grouped by terminal with the conversion pre-coding matrix that each antenna port is grouped Corresponding channel estimation value converts.

Process is implemented, below with the antenna system of base station for the ease of be more clearly understood that step 502 There is N number of antenna port, as a example by terminal reception antenna is 1 antenna, describe implementing of step 502 Process.Terminal has the situation more than 1 reception antenna, every reception antenna to use here like process side Formula.Meanwhile, the channel estimation value being grouped with each antenna port that describes here uses identical conversion precoding As a example by matrix, when implementing, the channel estimation value of different antennae port packet correspondence can use identical Conversion pre-coding matrix, it would however also be possible to employ the most independent conversion pre-coding matrix, it is achieved method is identical.Should Process can be described in detail below:

The LS channel estimation value of multiple antenna ports in terminal one CSI-RS of acquisition.Here, The reception signal on RE (Recourse Element, Resource Unit) taken by port n is designated as Y_n, end On mouth n, the pilot signal of transmission is designated as S_n, then the LS channel estimation value on port n is:

The channel least-squares estimation value of N number of antenna port is grouped by terminal, is divided into K group, often group Corresponding P antenna port, N=K × P.The LS channel estimation value of kth group antenna port is arranged as Vector:

Wherein,It is the LS channel estimation value of the 1st antenna port assigning to kth group, other By that analogy.

The LS channel estimation value often organized is converted by the terminal conversion pre-coding matrix determined:

Z_k=G_kV, k=1,2 ..., K ... ... ... ... ... ... (3)

Wherein, Z_kIt it is the conversion channel estimation value after the conversion of kth group.

The conversion channel estimation value often organized is processed by terminal, such as, be filtered, it is thus achieved that the most accurately Channel estimation value.For example, it is possible to carry out time domain least mean squares error filtering or the filter of frequency domain least mean-square error Ripple, or time domain and frequency-domain combined least mean-square error filtering.For kth group antenna port time domain The filtering of little mean square error refers to by kth group antenna port in a subframe or multiple subframe on the same frequency Conversion channel estimation value be filtered.If the phase that kth group antenna port is in one or more subframe Have multiple conversion channel estimation value on same frequency, i.e. there is the value of multiple different time points, these values it Between Filtering Processing can suppress noise and interference further, improve the precision that channel is estimated.Frequency domain filtering with And time domain is identical with the processing procedure of frequency-domain combined filtering.Terminal can also first carry out time-domain filtering, at this base Frequency domain filtering is carried out again on plinth, or, advanced row frequency domain filtering, carry out time-domain filtering the most again.

The equivalent channel estimated value of the kth group after note post processing is W_k, the equivalent channel of K group antenna port is estimated The equivalent channel of meter composition K × r port from base station to terminal:

[W₁ W₂ … W_K]=[G₁V G₂V … G_KV]……………………(4)

Wherein, the columns of r representing matrix V.

In the step 503 of above-mentioned flow process, terminal carries out the meter of CSI based on the equivalent descending channel information obtained Calculating and feed back, described CSI comprises one of following information or combination in any: RI, and (rank indication, order refers to Show), PMI, CQI (Channel Quality Indicator, channel quality indicate), RSRP (Reference Signal Receiving Power, Reference Signal Received Power).Such as, terminal obtains based in step 502 The equivalent channel of K × r port carry out CSI calculating and feed back, wherein, terminal carries out PMI when estimating, Code book used is the code book that K × r antenna port is corresponding.

If it should be noted that the network equipment is terminal is configured with multiple CSI-RS, can be every Individual CSI-RS is respectively configured the conversion pre-coding matrix of correspondence, and terminal is based on each CSI-RS Configuration, and the conversion pre-coding matrix of correspondence, perform the process shown in Fig. 5.The network equipment can also be The conversion pre-coding matrix that the configuration of all CSI-RS is identical, terminal is based on each CSI-RS And this conversion pre-coding matrix performs the flow process shown in Fig. 5.

By the description to the flow process shown in above-mentioned Fig. 5, it can be seen that descending according to this terminal of terminal The conversion pre-coding matrix that channel status is relevant, and measure the down channel estimated value obtained, it is thus achieved that equivalence Descending channel information, and carry out information feedback according to the equivalent descending channel information of described acquisition, Achieve the purpose of information feedback.On the other hand, due to conversion pre-coding matrix and terminal Downlink channel condition is correlated with, but independent, therefore based on this conversion pre-coding matrix pair with interference and noise The signal to noise ratio of the down channel of this terminal can be improved after the down channel estimated value conversion of this terminal.

The precision that channel is estimated by the embodiment of the present invention improves, and the coverage being equivalent to base station expands.Assume N-th antenna port is H to the real channel of terminal_n, then the signal that terminal receives can be expressed as Y_n=H_nS_n+I_n, wherein I_nIt it is the interference that receives in corresponding resource of terminal and noise, it is assumed that its variance For σ², and assume that on different antennae port, interference is identical with the power of noise, then the least square of port n Channel estimation value can be expressed as:

Might as well assume that pilot signal is unit power, i.e. I'_nVariance remain as σ², then this least square channel In estimated value, signal to noise ratio snr (Signal-to-Noise Ratio, signal to noise ratio) is:

$\mathrm{SNR}=\frac{{\left|H_n\right|}^2}{{\mathrm{\σ}}^2}...\left(6\right)$

According to formula (3) calculated equivalence LS channel estimation value by P antenna port LS channel estimation value merges and obtains, and the SNR of this equivalence LS channel estimation value is then Become:

$\mathrm{SNR}=\frac{\left|\right|{\left[\begin{array}{cccc}{H}_{k,1}& H_{k,2}& ...& H_{k,P}\end{array}\right]V\left|\right|}^2}{{\mathrm{\σ}}^2{\left|\right|V\left|\right|}^2}...\left(7\right)$

Wherein, H_k,1The 1st antenna port of kth group is to the real channel of terminal.In formula (7), if V=[H_k,1 H_k,2 … H_k,P]^H, then SNR can reach maximum:

$\mathrm{SNR}=\frac{\left|\right|{\left[\begin{array}{cccc}{H}_{k,1}& H_{k,2}& ...& H_{k,P}\end{array}\right]\left|\right|}^2}{{\mathrm{\σ}}^2}...\left(8\right)$

It can be seen that this SNR will be higher than the SNR of single port LS channel estimation value.In reality, The value of V can have deviation with optimum value, but as long as deviation is little, the method still can improve A young waiter in a wineshop or an inn takes advantage of the SNR of channel estimation value, namely reduces the estimation difference of LS channel estimation value.

Seeing Figure 10, the channel condition information provided for the embodiment of the present invention obtains schematic flow sheet, this flow process Realize in network equipment side, such as can be performed by base station.As it can be seen, this flow process can comprise the steps:

Step 1001, the network equipment send the reference signal for carrying out channel condition information measurement.

Such as, base station is that terminal configures CSI-RS.Base station can be that terminal configures one or more CSI-RS, each CSI-RS includes multiple antenna port.Described configuration information can be by height Layer signal deployment.Base station is when terminal sends CSI-RS, usually, and the CSI-RS of each antenna port Signal sends from CSI-RS port, and such as, 64 antenna lists shown by the antenna array of base station Unit, then this CSI-RS has 64 antenna ports.

Step 1002, the described network equipment receive the first channel shape that terminal is fed back according to described reference signal State information, described first channel condition information is that described terminal is according to the downlink channel condition phase with described terminal The conversion pre-coding matrix closed and the down channel estimated value obtained according to described reference signal measurement obtain 's；Wherein, the channel of the least one set antenna port of the described network equipment is estimated by described conversion pre-coding matrix Evaluation is transformed to the equivalent descending channel information of 1 equivalent aerial port.

Step 1003, the described network equipment are according to the first channel condition information of described terminal feedback and described The conversion pre-coding matrix that terminal is used, determines and described terminal is carried out data transmission used precoding Matrix.

Preferably, the antenna port grouping information of this network equipment is also sent to described terminal by the network equipment. The network equipment can also determine antenna grouping information according to the mode made an appointment with described terminal.

The packet mode of the antenna port of the network equipment may is that and N number of antenna port is divided into K group, often The quantity of group antenna port is identical or different, N and K is the integer more than or equal to 1.Wherein, every string Antenna port can be divided into one group, or, every a line antenna port can be divided into one group；Or, every string In antenna port, all or part antenna port of the first polarised direction can be divided into one group, the second polarised direction All or part antenna port can be divided into another group.

For example, the packet mode of concrete antenna port may include that and N number of antenna port is divided into K Group, often P antenna port of group, P is the integer more than or equal to 1.Assume often to organize the number phase of antenna port With, if the number of antenna port is different, its processing procedure is identical with method, repeats no more.Such as, right In the aerial array of horizontal and vertical two-dimensional arrangements, each array antenna port can be divided into one group, such as Fig. 6 Shown in, or every a line antenna port is divided into one group, as shown in Figure 7.Horizontal and vertical two dimension is arranged The dual polarized antenna of row, can divide all antenna ports in an array antenna equipolarization direction into one group, i.e. One array antenna is divided into two groups according to polarised direction, such as Fig. 8；Can also be by an array antenna equipolarization direction Some antennas port divide one group into, such as one array antenna is divided into four groups according to polarised direction, shown in Fig. 9.

Antenna port grouping information can be applied, it is also possible at net in step 1003 by the network equipment Network equipment is to apply during terminal determines equivalent transformation pre-coding matrix, and particular content can be found in follow-up retouching State.

Preferably, before step 1002, i.e. receive terminal according to described reference at the described network equipment Before the channel condition information that signal is fed back, it is also possible to comprise the following steps: the described network equipment obtain with The conversion pre-coding matrix that the downlink channel condition of described terminal is relevant, and will be with described end by configuration information The conversion pre-coding matrix that the downlink channel condition of end is relevant is indicated to described terminal.

Wherein, the network equipment can obtain the conversion pre-coding matrix of terminal in several ways, the most only shows Enumerate to example three kinds of modes: mode B1, mode B2 and mode B3.

Mode B1: the conversion that the network equipment measures acquisition each antenna port packet based on down channel prelists Code matrix

In aforesaid way B1, the network equipment sends downlink reference signal to terminal, and described descending reference is believed Number include but not limited to CSI-RS or CRS signal.The described network equipment receives terminal according under this The channel condition information of row reference signal feedback, determines the conversion precoding of correspondence according to this channel condition information Matrix.Wherein, the network equipment can be for often organizing antenna port, it is thus achieved that the often group each self-corresponding change of antenna port Change pre-coding matrix, it is possible to for all groups of antenna ports, it is thus achieved that the change that all groups of antenna ports are jointly corresponding Change pre-coding matrix.

Mode B2: the network equipment obtains conversion pre-coding matrix based on channel reciprocity

In aforesaid way B2, the up channel of described terminal is measured by the network equipment, according to up and down Row channel reciprocity obtains the second channel status information of described terminal；The described network equipment is according to described second Channel condition information, determines the conversion pre-coding matrix of described terminal.Wherein, the network equipment can be for often group Antenna port, it is thus achieved that the often group each self-corresponding conversion pre-coding matrix of antenna port, it is possible to for all groups of skies Line cap, it is thus achieved that the conversion pre-coding matrix that all groups of antenna ports are jointly corresponding.

Specifically, in a tdd system, on or in FDD system, the difference of lower frequency is relative to carrier frequency In the case of smaller, up-downgoing channel has certain equivalence.Base station can be surveyed by up channel Amount, obtains descending channel information, thus calculates conversion pre-coding matrix according to descending channel information. Such as, can be maximum according to capacity or receive prominent principle or according to the user perspective choosing estimated Select conversion pre-coding matrix.

Mode B3: network equipment long-term channel based on terminal status information feedback obtains conversion precoding square Battle array

In aforesaid way B3, the network equipment is that terminal configuration is macrocyclic for carrying out channel condition information The reference signal resource measured, and receive the 3rd channel condition information of described terminal feedback, described 3rd letter Channel state information is that described terminal is according to the described macrocyclic reference for carrying out channel condition information measurement Signal resource is measured and feeds back；The described network equipment, according to described 3rd channel condition information, determines described The conversion pre-coding matrix of terminal.Wherein, the network equipment can be for often organizing antenna port, it is thus achieved that often organizes antenna The each self-corresponding conversion pre-coding matrix of port, it is possible to for all groups of antenna ports, it is thus achieved that all groups of antennas The conversion pre-coding matrix that port is jointly corresponding.

Preferably, the conversion pre-coding matrix acquired can be indicated to end by the network equipment in several ways End.Specifically, if defining the set of matrices of conversion pre-coding matrix, i.e. code book, then conversion prelists Code matrix can be allocated to terminal with the form of PMI, and PMI is conversion pre-coding matrix rope in the codebook Draw.Each element of conversion pre-coding matrix can also be notified to terminal by base station.

Alternatively, the network equipment can be by one or more PMI to terminal instruction conversion pre-coding matrix, should A conversion pre-coding matrix in the corresponding conversion pre-coding matrix set of one or more PMI.Network Equipment can also be by N number of PMI to terminal instruction conversion pre-coding matrix, and N is the integer more than 1, Pre-coding matrix in the corresponding pre-coding matrix set of each PMI, different precodings corresponding for PMI Matrix belongs to identical or different pre-coding matrix set.Described terminal is corresponding according to described N number of PMI N number of pre-coding matrix determines conversion pre-coding matrix, such as, according to this N number of PMI, prelists N number of Code matrix synthesizes conversion pre-coding matrix.

Further, the network equipment, when to terminal instruction conversion pre-coding matrix, can indicate that all antennas The conversion pre-coding matrix that packet shares, it is also possible to the conversion indicating the packet of each antenna corresponding respectively prelists Code matrix.

Preferably, for the described configuration information to terminal instruction conversion pre-coding matrix, can be believed by high level Order or the DCI carried out data transmission by dispatching described terminal are sent to described terminal.

In the step 1003 of flow process shown in Figure 10, the network equipment according to the CSI of terminal feedback, and can be tied Close the conversion pre-coding matrix that terminal is used, be calculated and this terminal is carried out data transmission used prelisting Code matrix.

Such as, the conversion pre-coding matrix that terminal uses is designated as V, and the PMI in the CSI of terminal feedback is corresponding Pre-coding matrix be designated as U, then the pre-coding matrix carried out data transmission this terminal can be expressed as:

$V\⊗U$ Or $U\⊗V$ ………………(9)

That is, pre-coding matrix can be write as the conversion pre-coding matrix pre-coding matrix with terminal feedback Kronecker product.The algorithm using other can also realize the function that this step is identical.

By the above description to flow process shown in Figure 10 it can be seen that the embodiment of the present invention achieves channel shape The purpose of state acquisition of information.Wherein, terminal prelists according to the conversion relevant to the downlink channel condition of this terminal Code matrix, and measure the down channel estimated value obtained, it is thus achieved that equivalence descending channel information, and according to institute The equivalent descending channel information stating acquisition carries out information feedback.Due to conversion pre-coding matrix be with The downlink channel condition of terminal is correlated with, but independent, therefore based on this conversion precoding with interference and noise Matrix can improve the signal to noise ratio of the down channel of this terminal after converting the down channel estimated value of this terminal.

Based on identical technology design, the embodiment of the present invention additionally provides a kind of terminal and a kind of network equipment, This terminal and the network equipment can be respectively applied to above-described embodiment.

See Figure 11, for the structural representation of the terminal that the embodiment of the present invention provides.As it can be seen, this terminal Comprise the steps that the first acquisition module the 1101, second acquisition module 1102 and feedback module 1103, wherein:

First acquisition module 1101, prelists for obtaining the conversion relevant to the downlink channel condition of described terminal Code matrix；

Second acquisition module 1102, for the descending letter obtained according to described conversion pre-coding matrix and measurement Road estimated value, it is thus achieved that equivalence descending channel information；Wherein, described conversion pre-coding matrix is by least one set sky The channel estimation value of line cap is transformed to the equivalent descending channel information of 1 equivalent aerial port；

Feedback module 1103, for carrying out channel condition information according to the equivalent descending channel information of described acquisition Feedback.

Preferably, the first acquisition module 1101 can be specifically for: the configuration information sent according to the network equipment, Obtaining the conversion pre-coding matrix relevant to the downlink channel condition of described terminal, described configuration information is used for referring to Show the conversion pre-coding matrix relevant to the downlink channel condition of described terminal.

Wherein, described conversion pre-coding matrix indicates in the following manner: one or more PMI, institute State the corresponding conversion pre-coding matrix of one or more PMI；Or, N number of PMI, N are more than 1 Integer, the corresponding pre-coding matrix of each PMI, different pre-coding matrixes corresponding for PMI belong to phase Same or different pre-coding matrix set, described terminal is according to N number of precoding corresponding for described N number of PMI Matrix determines conversion pre-coding matrix.

Preferably, the first acquisition module 1101 can be specifically for: the descending channel information obtained according to measurement, Determine conversion pre-coding matrix.

Preferably, the second acquisition module 1102 can be specifically for: carries out channel condition information survey according to being used for The reference signal of amount carries out downlink channel condition information measurement, it is thus achieved that down channel estimated value, according to described change Change pre-coding matrix described down channel estimated value is converted, it is thus achieved that conversion channel estimation value, to described The conversion channel estimation value acquired is filtered obtaining equivalence descending channel information.

Wherein, the second acquisition module 1102 can be according to described conversion pre-coding matrix, respectively to the network equipment The down channel estimated value corresponding to K group antenna port be weighted merge, obtain K group convert channel Estimated value, K is the integer more than or equal to 1；Again the described K group acquired conversion channel estimation value is carried out Filtering obtains K group equivalence descending channel information.

Preferably, above-mentioned terminal may also include the 3rd acquisition module 1104, for obtaining the sky of the network equipment Line cap grouping information.The antenna port grouping information that 3rd acquisition module 1104 gets, can be applicable to First acquisition module 1101 and/or the second acquisition module 1102 (as shown in broken lines).

Wherein, described antenna port grouping information is the configuration letter that described terminal sends according to the described network equipment Breath acquires；Or, described antenna port grouping information is that described terminal appoints in advance with the described network equipment Fixed.

Each array antenna port is divided into one group, or, every a line antenna port is divided into one group；Or, In each array antenna port, all or part antenna port of the first polarised direction is divided into one group, the second polarization The all or part antenna port in direction is divided into another group.Before the concrete packet mode of antenna port can be found in State the description of embodiment, do not repeat them here.

See Figure 12, for the structural representation of the network equipment that the embodiment of the present invention provides.As it can be seen, should The network equipment comprises the steps that sending module 1201, receiver module 1202 and determines module 1203, wherein:

Sending module 1201, for sending the reference signal for carrying out channel condition information measurement；

Receiver module 1202, for receiving the first channel status letter that terminal is fed back according to described reference signal Breath, described first channel condition information is that described terminal is according to relevant to the downlink channel condition of described terminal Conversion pre-coding matrix and the down channel estimated value obtained according to described reference signal measurement obtain；Its In, the channel estimation value of the least one set antenna port of the described network equipment is become by described conversion pre-coding matrix It is changed to the equivalent descending channel information of 1 equivalent aerial port；

Determine module 1203, for the first channel condition information according to described terminal feedback and described terminal The conversion pre-coding matrix used, determines and described terminal carries out data transmission used precoding square Battle array.

Preferably, this network equipment also includes indicating module 1204, and this module is at receiver module 1202 Before receiving the channel condition information that terminal is fed back according to described reference signal, it is thus achieved that with under described terminal The conversion pre-coding matrix that row channel status is relevant, and by configuration information by the down channel with described terminal The conversion pre-coding matrix that state is relevant is indicated to described terminal.

Preferably, indicating module 1204 can be for the often group antenna port of the described network equipment, it is thus achieved that with institute State the conversion pre-coding matrix that the downlink channel condition of terminal is relevant.

Preferably, the up channel of described terminal can be measured, according to up-downgoing by indicating module 1204 Channel reciprocity obtains the second channel status information of described terminal；According to described second channel status information, Determine the conversion pre-coding matrix of described terminal；Or, indicating module 1204 can be specifically for: for described Terminal is configured to carry out the reference signal resource of channel condition information measurement, and receives described terminal feedback 3rd channel condition information, described 3rd channel condition information be described terminal according to described for carrying out channel The reference signal resource that status information is measured is measured and feeds back；According to described 3rd channel condition information, really The conversion pre-coding matrix of fixed described terminal.

Wherein, described conversion pre-coding matrix indicates in the following manner: one or more PMI, institute State the corresponding conversion pre-coding matrix of one or more PMI；Or, N number of PMI, described terminal according to N number of pre-coding matrix corresponding for described N number of PMI determines conversion pre-coding matrix, and N is whole more than 1 Number, the corresponding pre-coding matrix of each PMI, different pre-coding matrixes corresponding for PMI belong to identical or Different pre-coding matrix set.

Preferably, the antenna port grouping information of the described network equipment also can be sent to by sending module 1201 Terminal.Or, determine according to the mode made an appointment with described terminal, module 1203 also can determine that antenna divides Group information.

Wherein, each array antenna port of the network equipment is divided into one group, or, every a line antenna port quilt It is divided into one group；Or, in each array antenna port, all or part antenna port of the first polar orientation is divided Be one group, all or part antenna port of the second polar orientation be divided into another group.Antenna port concrete Packet mode can be found in the description of previous embodiment, does not repeats them here.

See Figure 13, for the structural representation of the terminal that another embodiment of the present invention provides.As it can be seen, should Terminal comprises the steps that processor 1301, memorizer 1302, transceiver 1303 and EBI, it is also possible to Farther include user interface.

Processor 1301 is responsible for bus architecture and common process, and memorizer 1302 can store process The data that device 1301 is used when performing operation.Transceiver 1303 is for the control at processor 1301 Lower reception and transmission data.

Bus architecture can include bus and the bridge of any number of interconnection, is specifically represented by processor 1301 One or more processors and the various electrical chains of memorizer that represent of memorizer 1302 be connected together.Always Line architecture can also be by other circuit various of such as ancillary equipment, manostat and management circuit or the like Linking together, these are all to it is known in the art, therefore, are the most no longer described further it. EBI provides interface.Transceiver 1303 can be multiple element, i.e. includes transmitter and receiver, Unit for communicating with other devices various over a transmission medium is provided.For different subscriber equipmenies, use Family interface can also is that can external in connect the interface needing equipment, the equipment of connection includes but not limited to little key Dish, display, speaker, mike, stick etc..

Processor 1301, for reading the program in memorizer 1302, performs following process:

Obtain the conversion pre-coding matrix relevant to the downlink channel condition of described terminal；

The down channel estimated value obtained according to described conversion pre-coding matrix and measurement, it is thus achieved that equivalence is descending Channel information；Wherein, the channel estimation value of least one set antenna port is converted by described conversion pre-coding matrix It it is the equivalent descending channel information of 1 equivalent aerial port；

Equivalent descending channel information according to described acquisition carries out information feedback.

Preferably, processor 1301 can be specifically for: the configuration information sent according to the network equipment, it is thus achieved that The conversion pre-coding matrix relevant to the downlink channel condition of described terminal, described configuration information for instruction with The conversion pre-coding matrix that the downlink channel condition of described terminal is relevant.

Wherein, described conversion pre-coding matrix indicates in the following manner: one or more PMI, institute State the corresponding conversion pre-coding matrix of one or more PMI；Or, N number of PMI, N are more than 1 Integer, the corresponding pre-coding matrix of each PMI, different pre-coding matrixes corresponding for PMI belong to phase Same or different pre-coding matrix set, described terminal is according to N number of precoding corresponding for described N number of PMI Matrix determines conversion pre-coding matrix.

Preferably, processor 1301 can be specifically for: the descending channel information obtained according to measurement, determines Conversion pre-coding matrix.

Preferably, processor 1301 can be specifically for: according to the ginseng for carrying out channel condition information measurement Examine signal and carry out downlink channel condition information measurement, it is thus achieved that down channel estimated value；Prelist according to described conversion Described down channel estimated value is converted by code matrix, it is thus achieved that conversion channel estimation value；Acquire described Conversion channel estimation value be filtered obtaining equivalence descending channel information.

Specifically, processor 1301 can be according to described conversion pre-coding matrix, the K to the network equipment respectively Group down channel estimated value corresponding to antenna port is weighted merging, and obtains K group conversion channel and estimates Value, K is the integer more than or equal to 1, is then filtered described K group conversion channel estimation value, obtains K group equivalence descending channel information.

Preferably, processor 1301 also can obtain the antenna port grouping information of the network equipment.

Specifically, described antenna port grouping information is the configuration that described terminal sends according to the described network equipment Information acquisition arrives；Or, described antenna port grouping information is described terminal with the described network equipment in advance Agreement.

Wherein, each array antenna port is divided into one group, or, every a line antenna port is divided into one group； Or, in each array antenna port all or part antenna port of the first polarised direction be divided into one group, The all or part antenna port of two polarised directions is divided into another group.The concrete packet mode of antenna port can See the description of previous embodiment, do not repeat them here.

See Figure 14, for the structural representation of the network equipment that another embodiment of the present invention provides.As it can be seen, This network equipment comprises the steps that processor 1401, memorizer 1402, transceiver 1403 and EBI.

Processor 1401 is responsible for bus architecture and common process, and memorizer 1402 can store process The data that device 1301 is used when performing operation.Transceiver 1403 is for the control at processor 1401 Lower reception and transmission data.

Bus architecture can include bus and the bridge of any number of interconnection, is specifically represented by processor 1401 One or more processors and the various electrical chains of memorizer that represent of memorizer 1402 be connected together.Always Line architecture can also be by other circuit various of such as ancillary equipment, manostat and management circuit or the like Linking together, these are all to it is known in the art, therefore, are the most no longer described further it. EBI provides interface.Transceiver 1403 can be multiple element, i.e. includes transmitter and transceiver, Unit for communicating with other devices various over a transmission medium is provided.Processor 1401 is responsible for always Line architecture and common process, memorizer 1402 can store processor 1401 and be used when performing operation Data.

Processor 1401, for reading the program in memorizer 1402, performs following process:

The reference signal for carrying out channel condition information measurement is sent by transceiver 1403；

The first channel condition information that terminal is fed back is received according to described reference signal by transceiver 1403, Described first channel condition information is that described terminal is according to the change relevant to the downlink channel condition of described terminal Change pre-coding matrix and the down channel estimated value that obtains according to described reference signal measurement obtains；Its In, the channel estimation value of the least one set antenna port of the described network equipment is become by described conversion pre-coding matrix It is changed to the equivalent descending channel information of 1 equivalent aerial port；

The conversion that the first channel condition information according to described terminal feedback and described terminal are used prelists Code matrix, determines and described terminal is carried out data transmission used pre-coding matrix.

Preferably, processor 1401 can be additionally used in: is receiving terminal according to described ginseng by transceiver 1403 Before examining the first channel condition information that signal is fed back, it is thus achieved that relevant to the downlink channel condition of described terminal Conversion pre-coding matrix, and by configuration information by the conversion relevant to the downlink channel condition of described terminal Pre-coding matrix is indicated to described terminal.

Preferably, processor 1401 can be specifically for: for the often group antenna port of the described network equipment, Obtain the conversion pre-coding matrix relevant to the downlink channel condition of described terminal.

Preferably, processor 1401 can be specifically for: measures the up channel of described terminal, root The second channel status information of described terminal is obtained according to up-downgoing channel reciprocity；According to described second channel shape State information, determines the conversion pre-coding matrix of described terminal.Or, processor 1401 can be specifically for: It is configured to carry out the reference signal resource of channel condition information measurement for described terminal, and passes through transceiver 1403 the 3rd channel condition informations receiving described terminal feedback, described 3rd channel condition information is described end End is measured according to the described reference signal resource for carrying out channel condition information measurement and feeds back；According to institute State the 3rd channel condition information, determine the conversion pre-coding matrix of described terminal.

Wherein, described conversion pre-coding matrix indicates in the following manner: one or more PMI, institute State the corresponding conversion pre-coding matrix of one or more PMI；Or, N number of PMI, described terminal according to N number of pre-coding matrix corresponding for described N number of PMI determines conversion pre-coding matrix, and N is whole more than 1 Number, the corresponding pre-coding matrix of each PMI, different pre-coding matrixes corresponding for PMI belong to identical or Different pre-coding matrix set.

Preferably, processor 1401 can be additionally used in: by transceiver 1403 by the antenna of the described network equipment Port grouping information is sent to terminal.Or, processor 1401 also can be made an appointment according to described terminal Mode determine antenna grouping information.

Wherein, each array antenna port is divided into one group, or, every a line antenna port is divided into one group； Or, in each array antenna port all or part antenna port of the first polar orientation be divided into one group, The all or part antenna port of two polar orientation is divided into another group.The concrete packet mode of antenna port can See the description of previous embodiment, do not repeat them here.

In sum, in the above embodiment of the present invention, terminal is according to the downlink channel condition phase with this terminal The conversion pre-coding matrix closed, and measure the down channel estimated value obtained, it is thus achieved that equivalence down channel letter Breath, and carry out information feedback according to the equivalent descending channel information of described acquisition, it is achieved that channel The purpose of status information feedback.On the other hand, due to conversion pre-coding matrix be the down channel shape with terminal State is correlated with, but independent, therefore based on this conversion pre-coding matrix under this terminal with interference and noise The signal to noise ratio of the down channel of this terminal can be improved after the conversion of row channel estimation value.

The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and / or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/ Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.

These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart The function specified in flow process and/or one square frame of block diagram or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, makes Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.

Although preferred embodiments of the present invention have been described, but those skilled in the art once know base This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.

Claims (27)

1. a channel state information feedback method, it is characterised in that the method includes:

Terminal obtains the conversion pre-coding matrix relevant to the downlink channel condition of described terminal；

The down channel estimated value that described terminal obtains according to described conversion pre-coding matrix and measurement, it is thus achieved that Equivalence descending channel information；Wherein, the channel of least one set antenna port is estimated by described conversion pre-coding matrix Evaluation is transformed to the equivalent descending channel information of 1 equivalent aerial port；

Described terminal carries out information feedback according to the equivalent descending channel information of described acquisition.

2. the method for claim 1, it is characterised in that described terminal obtains and described terminal The conversion pre-coding matrix that downlink channel condition is relevant, specifically includes:

The configuration information that described terminal sends according to the network equipment, it is thus achieved that with the downlink channel condition of described terminal Relevant conversion pre-coding matrix, described configuration information is for the downlink channel condition phase of instruction with described terminal The conversion pre-coding matrix closed.

3. method as claimed in claim 2, it is characterised in that described conversion pre-coding matrix by with Under type indicates:

The corresponding conversion of one or more pre-coding matrixes instruction PMI, the one or more PMI prelists Code matrix；Or,

N number of PMI, N are the integer more than 1, the corresponding pre-coding matrix of each PMI, different PMI Corresponding pre-coding matrix belongs to identical or different pre-coding matrix set, and described terminal is according to described N number of N number of pre-coding matrix corresponding for PMI determines conversion pre-coding matrix.

4. the method for claim 1, it is characterised in that described terminal obtains and described terminal The conversion pre-coding matrix that downlink channel condition is relevant, specifically includes:

The descending channel information that described terminal obtains according to measurement, determines conversion pre-coding matrix.

5. the method for claim 1, it is characterised in that described terminal prelists according to described conversion The down channel estimated value that code matrix and measurement obtain, it is thus achieved that equivalence descending channel information, specifically includes:

Described terminal carries out downlink channel condition according to the reference signal being used for carrying out channel condition information measurement Information measurement, it is thus achieved that down channel estimated value；

Described down channel estimated value is converted by described terminal according to described conversion pre-coding matrix, it is thus achieved that Conversion channel estimation value；

The described conversion channel estimation value acquired is filtered obtaining equivalence down channel letter by described terminal Breath.

6. method as claimed in claim 5, it is characterised in that described terminal prelists according to described conversion The down channel estimated value that code matrix and measurement obtain, it is thus achieved that conversion channel estimation value, specifically includes:

Described terminal is according to described conversion pre-coding matrix, right to the K group antenna port institute of the network equipment respectively The down channel estimated value answered is weighted merging, and obtains K group conversion channel estimation value, and K is for being more than or equal to The integer of 1；

The described conversion channel estimation value acquired is filtered obtaining equivalence down channel letter by described terminal Breath, specifically includes:

Described K group conversion channel estimation value is filtered by described terminal, obtains K group equivalence down channel Information.

7. the method as according to any one of claim 1 to 6, it is characterised in that also include:

Described terminal obtains the antenna port grouping information of the network equipment.

8. method as claimed in claim 7, it is characterised in that described antenna port grouping information is institute State what terminal acquired according to the configuration information that the described network equipment sends；Or,

Described antenna port grouping information is that described terminal is made an appointment with the described network equipment.

9. method as claimed in claim 7 or 8, it is characterised in that each array antenna port is divided into One group, or, every a line antenna port is divided into one group；Or,

In each array antenna port all or part antenna port of the first polarised direction be divided into one group, second The all or part antenna port of polarised direction is divided into another group.

10. a channel state information acquisition method, it is characterised in that including:

The network equipment sends the reference signal for carrying out channel condition information measurement；

The described network equipment receives the first channel condition information that terminal is fed back, institute according to described reference signal Stating the first channel condition information is that described terminal is according to the conversion relevant to the downlink channel condition of described terminal Pre-coding matrix and the down channel estimated value obtained according to described reference signal measurement obtain；Wherein, The channel estimation value of the least one set antenna port of the described network equipment is converted by described conversion pre-coding matrix It it is the equivalent descending channel information of 1 equivalent aerial port；

The described network equipment is made according to the first channel condition information and the described terminal of described terminal feedback Conversion pre-coding matrix, determine and described terminal carried out data transmission used pre-coding matrix.

11. methods as claimed in claim 10, it is characterised in that the described network equipment receives terminal root According to before the first channel condition information that described reference signal is fed back, also include:

The described network equipment obtains the conversion pre-coding matrix relevant to the downlink channel condition of described terminal, and By configuration information, the conversion pre-coding matrix relevant to the downlink channel condition of described terminal is indicated to institute State terminal.

12. methods as claimed in claim 11, it is characterised in that the described network equipment obtains with described The conversion pre-coding matrix that the downlink channel condition of terminal is relevant, specifically includes:

The described network equipment is for the often group antenna port of the described network equipment, it is thus achieved that descending with described terminal The conversion pre-coding matrix that channel status is relevant.

13. methods as claimed in claim 11, it is characterised in that the described network equipment obtains with described The conversion pre-coding matrix that the downlink channel condition of terminal is relevant, specifically includes:

The up channel of described terminal is measured by the described network equipment, obtains according to up-downgoing channel reciprocity Second channel status information to described terminal；

The described network equipment, according to described second channel status information, determines the conversion precoding square of described terminal Battle array；

Or, the described network equipment obtains the conversion precoding square relevant to the downlink channel condition of described terminal Battle array, specifically includes:

The described network equipment is the reference signal money that described terminal is configured to carry out channel condition information measurement Source, and receive the 3rd channel condition information of described terminal feedback, described 3rd channel condition information is described Terminal is measured according to the described reference signal resource for carrying out channel condition information measurement and feeds back；

The described network equipment, according to described 3rd channel condition information, determines the conversion precoding square of described terminal Battle array.

14. methods as claimed in claim 11, it is characterised in that described conversion pre-coding matrix passes through In the following manner indicates:

The corresponding conversion of one or more pre-coding matrixes instruction PMI, the one or more PMI prelists Code matrix；Or,

N number of PMI, described terminal determines conversion according to N number of pre-coding matrix that described N number of PMI is corresponding Pre-coding matrix, N is the integer more than 1, the corresponding pre-coding matrix of each PMI, different PMI Corresponding pre-coding matrix belongs to identical or different pre-coding matrix set.

15. methods as according to any one of claim 10 to 14, it is characterised in that also include:

The antenna port grouping information of the described network equipment is sent to described terminal by the described network equipment；

Or, the described network equipment determines antenna grouping information according to the mode made an appointment with described terminal.

16. methods as claimed in claim 15, it is characterised in that each array antenna port is divided into one Group, or, every a line antenna port is divided into one group；Or,

In each array antenna port all or part antenna port of the first polar orientation be divided into one group, second The all or part antenna port of polar orientation is divided into another group.

17. 1 kinds of terminals, it is characterised in that including:

First acquisition module, for obtaining the conversion precoding square relevant to the downlink channel condition of described terminal Battle array；

Second acquisition module, estimates for the down channel obtained according to described conversion pre-coding matrix and measurement Evaluation, it is thus achieved that equivalence descending channel information；Wherein, described conversion pre-coding matrix is by least one set antenna end The channel estimation value of mouth is transformed to the equivalent descending channel information of 1 equivalent aerial port；

Feedback module, anti-for carrying out channel condition information according to the equivalent descending channel information of described acquisition Feedback.

18. terminals as claimed in claim 17, it is characterised in that described first acquisition module is specifically used In: the configuration information sent according to the network equipment, it is thus achieved that the change relevant to the downlink channel condition of described terminal Changing pre-coding matrix, described configuration information is for indicating the conversion relevant to the downlink channel condition of described terminal Pre-coding matrix.

19. terminals as claimed in claim 17, it is characterised in that described first acquisition module is specifically used In: the descending channel information obtained according to measurement, determine conversion pre-coding matrix.

20. terminals as claimed in claim 17, it is characterised in that described second acquisition module is specifically used In: the reference signal according to being used for carrying out channel condition information measurement carries out downlink channel condition information measurement, Obtain down channel estimated value, according to described conversion pre-coding matrix, described down channel estimated value is become Change, it is thus achieved that conversion channel estimation value, be filtered obtaining equivalence to the described conversion channel estimation value acquired Descending channel information.

21. terminals as claimed in claim 20, it is characterised in that described second acquisition module is specifically used In: according to described conversion pre-coding matrix, descending to corresponding to the K group antenna port of the network equipment respectively Channel estimation value is weighted merging, and obtains K group conversion channel estimation value, and K is the integer more than or equal to 1； It is filtered obtaining K group equivalence descending channel information to the described K group acquired conversion channel estimation value.

22. terminals as according to any one of claim 17 to 21, it is characterised in that also include:

3rd acquisition module, for obtaining the antenna port grouping information of the network equipment.

23. 1 kinds of network equipments, it is characterised in that including:

Sending module, for sending the reference signal for carrying out channel condition information measurement；

Receiver module, for receiving the first channel condition information that terminal is fed back according to described reference signal, Described first channel condition information is that described terminal is according to the change relevant to the downlink channel condition of described terminal Change pre-coding matrix and the down channel estimated value that obtains according to described reference signal measurement obtains；Its In, the channel estimation value of the least one set antenna port of the described network equipment is become by described conversion pre-coding matrix It is changed to the equivalent descending channel information of 1 equivalent aerial port；

Determine module, for being made according to the first channel condition information and the described terminal of described terminal feedback Conversion pre-coding matrix, determine and described terminal carried out data transmission used pre-coding matrix.

24. network equipments as claimed in claim 23, it is characterised in that also include:

Indicating module, for receiving, at described receiver module, the channel that terminal is fed back according to described reference signal Before status information, it is thus achieved that the conversion pre-coding matrix relevant to the downlink channel condition of described terminal, and lead to Cross configuration information and the conversion pre-coding matrix relevant to the downlink channel condition of described terminal is indicated to described Terminal.

25. network equipments as claimed in claim 24, it is characterised in that described indicating module is specifically used In: for the often group antenna port of the described network equipment, it is thus achieved that relevant to the downlink channel condition of described terminal Conversion pre-coding matrix.

26. network equipments as claimed in claim 24, it is characterised in that described indicating module is specifically used In: the up channel of described terminal is measured, obtains described terminal according to up-downgoing channel reciprocity Second channel status information；According to described second channel status information, determine the conversion precoding of described terminal Matrix；

Or, described indicating module specifically for: be configured to carry out channel condition information survey for described terminal The reference signal resource of amount, and receive the 3rd channel condition information of described terminal feedback, described 3rd channel Status information is that described terminal is surveyed according to the described reference signal resource for carrying out channel condition information measurement Measure and feed back；According to described 3rd channel condition information, determine the conversion pre-coding matrix of described terminal.

27. network equipments as according to any one of claim 23 to 26, it is characterised in that described Module is sent to be additionally operable to: the antenna port grouping information of the described network equipment is sent to described terminal；Or,

Described determine that module is additionally operable to: determine antenna packet letter according to the mode made an appointment with described terminal Breath.