CN104243008B - A kind of method and apparatus of Limited Feedback information - Google Patents

A kind of method and apparatus of Limited Feedback information Download PDF

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Publication number
CN104243008B
CN104243008B CN201410514550.5A CN201410514550A CN104243008B CN 104243008 B CN104243008 B CN 104243008B CN 201410514550 A CN201410514550 A CN 201410514550A CN 104243008 B CN104243008 B CN 104243008B
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feedback
dimensions
channel
bits
combination
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CN201410514550.5A
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Chinese (zh)
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CN104243008A (en
Inventor
曹亘
卢尧
韩潇
范斌
孙雷
于璐
张天魁
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中国联合网络通信集团有限公司
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Abstract

The embodiment of the present invention provides a kind of method and apparatus of Limited Feedback information, is related to the communications field, solves because prior art to horizontal and vertical dimension distributes identical number of bits of feedback, the problem of causing feedback performance low, and this method includes:The feedback bits for determining to meet preparatory condition according to the channel condition information of the antenna array configuration information of base station and horizontal and vertical two dimensions distribute combination, the first code book and the second code book of the vertical dimensions of the combination producing horizontal dimensions are distributed according to the feedback bits, originally determines the pre-coding matrix instruction PMI of the horizontal dimensions respectively according to first code book and the second codehWith the pre-coding matrix instruction PMI of the vertical dimensionsv, by feedback bits distribution combination, pre-coding matrix instruction PMIhWith pre-coding matrix instruction PMIvSend to the base station.The embodiment of the present invention is used in 3D mimo systems user equipment Limited Feedback information to base station.

Description

A kind of method and apparatus of Limited Feedback information

Technical field

The present invention relates to the communications field, more particularly to a kind of Limited Feedback information of three-dimensional multi-user 3D-MIMO systems Method and apparatus.

Background technology

In LTE (Long Term Evolution, Long Term Evolution) and LTE-A (Long Term Evolution- Advanced, Long Term Evolution-advanced) in system, (how defeated Multiple-Input Multiple-Output, multi input be by MIMO Going out) technology can utilize the respective independently transmitted signal of multiple antennas of base station end, while be received in user terminal with multiple antennas and extensive Prime information in the multiple signal.Wherein, the MIMO includes the MIMO (abbreviation 2D-MIMO) of two dimension and the MIMO (abbreviations of 3-dimensional 3D-MIMO), wherein, 2D-MIMO antenna is as shown in figure 1,1,2,3,4 four antenna oscillators including horizontal dimensions, base station makes The user of varying level angle can be distinguished by sending signal to user with antenna as shown in Figure 1, but cannot distinguish between same water It is flat, the user of different distance, and 3D-MIMO antenna is as shown in Fig. 2 the basis of the antenna oscillator in original horizontal dimensions On, the antenna oscillator of vertical dimensions is added, forms 4 × 3 aerial array as shown in Figure 2, base station uses as shown in Figure 2 Antenna send signal to user and can distinguish user simultaneously in horizontal dimensions and vertical dimensions.

Precoding technique can solve the problem that the relativity problem of interchannel in mimo system, and the interference problem between user, Specifically, the signal that base station is sent according to current channel conditions to each antenna carries out precoding processing, is effective matching Current channel, the influence of the interference between channel relevancy and user is eliminated or reduces, so as to reach the mesh for improving systematic function 's.In order that base station know current channel conditions, it is necessary to user by its information feedback to base station, in real system In, it will usually the sequence number value channel condition information of some user being quantified as in code book, and the sequence number value is fed back to Base station.

For 3D-MIMO systems, the preferable feedback system information feedback of all users (will to base station) It is not used because of the defects of feedback information volume is big, quantification manner is complicated.In the prior art for the limited anti-of 3D-MIMO systems The method of feedforward information includes:Base station end and user terminal store the code book of a vertical dimensions and the code book of a horizontal dimensions, user End optimal vertical dimensions and level are selected from the code book to prestore according to the channel information of vertical dimensions and horizontal dimensions respectively The pre-coding matrix of dimension, and corresponding call number is fed back into base station, base station end precoding according to corresponding to selecting call number Matrix, and 3D pre-coding matrixes are obtained using tensor product to the pre-coding matrix of horizontal dimensions and vertical dimensions, and utilize the 3D Pre-coding matrix sends signal to each antenna and carries out precoding processing.Wherein, the bigger quantization to channel condition information of code book Precision is higher, and number of bits of feedback reflects the size of code book, that is to say, that certain dimension takes in feeding back channel state information Number of bits of feedback it is more, quantify more accurate to the channel information of the dimension.

From the foregoing, it will be observed that prior art to horizontal and vertical two dimensions by the way of code book even group-division, i.e., two dimension It is identical to spend the bit number of feedback, so, essence is quantified using identical for the different horizontal channel of channel gain and vertical channel Degree so that reflection of the information of Limited Feedback to channel conditions is not optimal, reduces feedback performance.

The content of the invention

The present invention provides a kind of method and apparatus of Limited Feedback information, by optimizing point of the feedback bits in two dimensions With mechanism, solve because prior art is to the identical number of bits of feedback of horizontal and vertical dimension distribution, cause feedback performance low Problem.

To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that:

First aspect, there is provided a kind of method of Limited Feedback, including:

Determined according to the channel condition information of the antenna array configuration information of base station and horizontal and vertical two dimensions full The feedback bits distribution combination of sufficient preparatory condition, the preparatory condition adds for the signal of Limited Feedback and ideal feedback with interference makes an uproar Acoustic ratio SINR difference is within the scope of predetermined;

The of the first code book of horizontal dimensions and the vertical dimensions according to the feedback bits distribute combination producing Two code books, and the pre-coding matrix instruction of the horizontal dimensions is originally determined according to first code book and the second code respectively PMIhWith the pre-coding matrix instruction PMI of the vertical dimensionsv

By feedback bits distribution combination, the pre-coding matrix instruction PMIhWith the pre-coding matrix instruction PMIv Send to the base station.

Second aspect, there is provided a kind of user equipment, including:

Bit Distribution Unit, the letter for the antenna array configuration information according to base station and horizontal and vertical two dimensions Channel state information determines the feedback bits distribution combination for meeting preparatory condition, and the preparatory condition is Limited Feedback and ideal feedback Signal to Interference plus Noise Ratio SINR difference within the scope of predetermined;

Code book generation unit, for according to the feedback bits distribute combination producing described in horizontal dimensions the first code book and Second code book of the vertical dimensions;

Quantifying unit, for originally determining prelisting for the horizontal dimensions respectively according to first code book and the second code Code matrix instruction PMIhWith the pre-coding matrix instruction PMI of the vertical dimensionsv

Feedback unit, for distributing the feedback bits to combination, the pre-coding matrix instruction PMIhPrelisted with described Code matrix instruction PMIvSend to the base station.

Using such scheme, choose can make SINR differences between Limited Feedback and ideal feedback predetermined scope it Horizontal and vertical two dimensions are distributed in interior feedback bits distribution combination, and feedback bits combination divides more feedback bits The larger dimension of gain is assigned to, less feedback bits are distributed to the less dimension of gain so that the information pair of Limited Feedback The reflection of channel conditions is optimal, improves the feedback performance of Limited Feedback.

Brief description of the drawings

In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this For the those of ordinary skill of field, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other Accompanying drawing.

Fig. 1 is a kind of schematic diagram of the antenna for 2D-MIMO that prior art provides;

Fig. 2 is a kind of schematic diagram of the antenna for 3D-MIMO that prior art provides;

Fig. 3 is a kind of schematic flow sheet of the method for Limited Feedback information provided in an embodiment of the present invention;

Fig. 4 is the schematic flow sheet of the method for another Limited Feedback information provided in an embodiment of the present invention;

Fig. 5 is a kind of structural representation of user equipment provided in an embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.

The embodiment of the present invention provides a kind of method of Limited Feedback, as shown in figure 3, this method includes:

S301, user equipment are according to the antenna array configuration information of base station and the channel shape of horizontal and vertical two dimensions State information determines the feedback bits distribution combination for meeting preparatory condition.

Wherein, the preparatory condition is SINR (the Signal to Interference plus of Limited Feedback and ideal feedback Noise Ratio, Signal to Interference plus Noise Ratio) difference is within the scope of predetermined.

The intensity of the explanation of value, the intensity for the useful signal that the SINR represents to receive and the interference signal received Ratio, the SINR differences of Limited Feedback and ideal feedback are smaller, show the Limited Feedback closer to the ideal feedback, feedback Channel condition information is more accurate.

Alternatively, it is true according to the channel condition information of horizontal dimensions and the channel condition information of vertical dimensions in user equipment Surely before meeting the feedback bits distribution combination of preparatory condition, user equipment receives the CSI-RS (Channel that base station is sent State Indication-Reference Signal, channel status instruction reference information) and the antenna array configuration information, The CSI-RS includes the CSI-RS of the horizontal dimensions and the CSI-RS of the vertical dimensions, and the antenna array configuration information includes level The antenna oscillator number N of dimension and the antenna oscillator number M of vertical dimensions;Then the user equipment is according to the CSI- of the horizontal dimensions The RS and CSI-RS of the vertical dimensions determines the channel condition information h of the horizontal dimensionsK, h(TTIt) and the vertical dimensions channel Status information hK, v(TTIt)。

Wherein, the CSI-RS is used for channel measurement, and TTI is Transmission Time Interval, hK, h(TTIt) represent to inscribe during t TTI User K is in the channel condition information of horizontal dimensions, hK, v(TTIt) represent to inscribe channels of the user K in vertical dimensions during t TTI Status information.

Specifically, the user equipment obtains feedback bits in the whole optional distribution group of the horizontal dimensions and the vertical dimensions Close, and the SINR differences between Limited Feedback and ideal feedback are asked for using each group of optional distribution combination, meeting the SINR At least one set of optional distribution combination of the difference within the preset range in determine that the feedback bits combine, the feedback bits group Close the first number of bits of feedback b included for horizontal dimensions distributionhWith the second number of bits of feedback b distributed for the vertical dimensionsv

Alternatively, the user equipment obtains feedback bits in the whole optional distribution group of the horizontal dimensions and the vertical dimensions Conjunction includes following two modes:

Mode one, the user equipment pass through formula one:

Ask for first number of bits of feedback bh, and by formula two:bv=B-bh;Obtain second number of bits of feedback bv

Wherein, B is the number for total feedback bits that user equipment feeds back to base station, and N is that antenna for base station is tieed up in the level The antenna oscillator number of degree, M are antenna oscillator number of the antenna for base station in the vertical dimensions.

Wherein, the number of total feedback bits is pre-defined limited value set, such as B belongs in section [8,14] Positive integer.

Illustratively, the antenna for base station horizontal dipole number is 4, and vertical dipole number is 3, the channel status of the horizontal dimensions Information hK, h(TTIt)=[x0 x1 x2 x3], the channel condition information h of the vertical dimensionsK, v(TTIt)=[y0 y1 y2]T, thus H can be obtainedK, h(TTIt) mould size | | hK, h(TTIt)||2, and h can be obtainedK, v(TTIt) mould size | | hK, v(TTIt)| |2, so, in above formula | | hK, h(TTIt)||2, | | hK, v(TTIt)||2, B, N, thus M is, it is known that can obtain bhAt least one set solution, And by bv=B-bhAsk for each bhB corresponding to solutionv, obtain the whole optional distribution combination of feedback bits.

Mode two, the user equipment inquire about default feedback bits distribution list, obtain feedback bits in the horizontal dimension The optional distribution combination of degree and vertical dimensions whole.

Illustratively, 4 × 4 antenna array structures of base station configuration, user is on the basis of known total number of bits of feedback, root According to the optimization allocation result under theoretical model, distribution combination of the feedback bits in horizontal and vertical dimension is preset, such as table 1 below institute Show:

Table 1

Then the user equipment inquires about default feedback bits distribution list, obtains feedback bits in the horizontal dimensions and institute State the whole optional distribution combination of vertical dimensions.

Above-mentioned table 1 is merely illustrative, for the different aerial array in base station, user's predeterminable different feedback bits point With list, for example, base-station antenna array is 8 × 8 structures, then the predeterminable feedback bits distribution list as shown in table 2 of user, this Invention is not limited this.

Table 2

Further, the user equipment passes through formula three using each group of optional distribution combination:

The difference of the selected corresponding SINR of distribution combination and ideal feedback is asked for, wherein, f represents Limited Feedback and ideal SINR differences between feedback.

So, by judging that whether being within the preset range for f can determine that the feedback bits for meeting preparatory condition Distribution combination, it is necessary to explanation, within the preset range optional distribution combination may have it is multigroup, now, it is preferred that The minimum optional distribution combination of the SINR differences between Limited Feedback and ideal feedback is selected in multigroup optional distribution combination Distribute and combine as feedback bits.

The first code book that S302, the user equipment distribute the combination producing horizontal dimensions according to the feedback bits is vertical with this Second code book of dimension, and the pre-coding matrix instruction of the horizontal dimensions is originally determined according to first code book and the second code respectively PMIhWith the pre-coding matrix instruction PMI of the vertical dimensionsv

Illustratively, in feedback bits distribution combination, first number of bits of feedback bhFor 4, first number of bits of feedback bvFor 3, then the user equipment is according to first number of bits of feedback bhFirst code book that size is 4 × 4 can be generated, it is second anti-according to this Present bit number bvSecond code book that size is 3 × 3 can be generated.

What deserves to be explained is first code book and second code book are matrix, between the column vector in the matrix two-by-two Orthogonal, user equipment needs sequential value (i.e. precoding being quantified as channel condition information in the code book of corresponding dimension Matrix indicates), for indicating some column vector in the matrix, the column vector is the pre-coding matrix of corresponding dimension.

S303, the user equipment combine feedback bits distribution, pre-coding matrix instruction PMIhWith the precoding square Battle array instruction PMIvSend to the base station.

Specifically, combination difference is distributed in the base station after feedback bits distribution combination is received according to the feedback bits Generation first code book and second code book consistent with user equipment, and according to the PMIhWith the PMIvIn first code book and The pre-coding matrix of horizontal dimensions and the pre-coding matrix of vertical dimensions are determined in second code book respectively, and to the horizontal dimensions Pre-coding matrix and vertical dimensions pre-coding matrix carry out tensor product obtain 3D pre-coding matrixes.

Alternatively, the user equipment updates feedback bits distribution combination, the pre-coding matrix instruction according to update cycle T PMIhWith pre-coding matrix instruction PMIv, and distribute the feedback bits after renewal to combination, the pre-coding matrix instruction PMIhWith the pre-coding matrix instruction PMIvSend to the base station.

Specifically, the Transmission Time Interval between the base station and user equipment is TTI, then update cycle T is the TTI's Integral multiple, that is to say, that it is the positive integer more than or equal to 1 that update cycle T, which includes t Transmission Time Interval TTI, t,.

It should be noted that update cycle T can immobilize, user equipment starts more when detecting t TTI Newly.

In a kind of possible implementation of the embodiment of the present invention, the user equipment can use formula four:

Obtain the channels of the horizontal dimensions before the update with the channel relevancy ρ after renewalk,h,T;And using formula Five:

Obtain the channels of the vertical dimensions before the update with the channel relevancy ρ after renewalk,v,T, and according to the ρk,h,T With the ρk,v,T dynamically adjusts update cycle T.

Wherein, the L is the total channel number of horizontal dimensions, and the R is the total channel number of vertical dimensions, the hk,h,l (nT) it is channel condition information of the l articles channel of horizontal dimensions in n-th of cycle T, the h* k,h,i((n+1) T) is described hk,h,l(nT) conjugation, the hk,v,l(nT) it is channel condition information of the l articles channel of vertical dimensions in n-th of cycle T, The h* k,v,i((n+1) T) is hk,v,l(nT) conjugation, τlAnd τiRepresent that the time delay of l articles of channel and i-th article of channel is big respectively It is small.

Specifically, in the ρk,h,TWith the ρk,v,TWhen being satisfied by default correlation upper limit threshold, user equipment increase should Update cycle T;In the ρk,h,TAnd/or the ρk,v,TWhen meeting default lower correlation threshold value, reduce update cycle T.

Using such scheme, choose can make SINR differences between Limited Feedback and ideal feedback predetermined scope it Horizontal and vertical two dimensions are distributed in interior feedback bits distribution combination, and feedback bits combination divides more feedback bits The larger dimension of gain is assigned to, less feedback bits are distributed to the less dimension of gain so that the information pair of Limited Feedback The reflection of channel conditions is optimal, improves the feedback performance of Limited Feedback.

In order that those skilled in the art can be more clearly understood that a kind of Limited Feedback letter provided in an embodiment of the present invention The technical scheme of the method for breath, a kind of method of Limited Feedback information provided by the invention is entered below by specific embodiment Row describes in detail, so that the user equipment is in n-th of update cycle T as an example, as shown in figure 4, including:

S401, base station send channel status instruction reference information CSI-RS and antenna array configuration information to user equipment.

Wherein, the CSI-RS includes the CSI-RS of the horizontal dimensions and the CSI-RS of the vertical dimensions, and the aerial array is matched somebody with somebody Confidence breath includes the antenna oscillator number N of horizontal dimensions and the antenna oscillator number M of vertical dimensions.

It should be noted that the antenna array configuration information can be initially set up in the base station with the user equipment is connected (n =0) send when, and preserved by user equipment, so, for the user equipment in renewal every time afterwards, base station is without again to this User equipment sends the antenna array configuration information.

S402, user equipment determine the horizontal dimensions according to the CSI-RS of the horizontal dimensions and the vertical dimensions CSI-RS Channel condition information hK, h(TTIt) and the vertical dimensions channel condition information hK, v(TTIt)。

Specifically, if current update cycle T is t TTI, the user equipment is detecting that current time meets renewal During cycle T, the CSI-RS sent according to the base station starts more new technological process, that is, starts to perform step S402.

S403, the user equipment are according to the hK, h(TTIt) and the hK, v(TTIt) horizontal dimensions and vertical dimensions are determined respectively Channel relevancy ρ after before the updatek,h,TAnd ρk,v,T

Illustratively, by:

With

Calculate and obtain the ρk,h,TWith the ρk,v,T

Wherein, the L is the total channel number of horizontal dimensions, and the R is the total channel number of vertical dimensions, the hk,h,l (nT) it is channel condition information of the l articles channel of horizontal dimensions in n-th of cycle T, the h* k,h,i((n+1) T) is described hk,h,l(nT) conjugation, the hk,v,l(nT) it is channel condition information of the l articles channel of vertical dimensions in n-th of cycle T, The h* k,v,i((n+1) T) is the hk,v,l(nT) conjugation, τlAnd τiRepresent respectively l articles of channel and i-th article of channel when Prolong size.

S404, the user equipment judge the ρk,h,TWith the ρk,v,TCorrelation upper limit threshold corresponding to whether being satisfied by.

Specifically, the correlation upper limit threshold ρ of user preset horizontal dimensionshupWith the correlation upper limit threshold of horizontal dimensions ρvupIf the ρk,h,TMeet the correlation upper limit threshold of the horizontal dimensions, such as ρk,h,Thup, and the ρk,v,TMeet the vertical dimensions Correlation upper limit threshold, such as ρk,v,Tvup, then the user equipment perform step S405, otherwise, the user equipment perform step S406。

S405, the user equipment are it is determined that the ρk,h,TWith the ρk,v,TCorresponding to being satisfied by during correlation upper limit threshold, increase Update cycle T.

Illustratively, current update cycle T is t TTI, and t is the positive integer more than 0, and the user equipment is it is determined that the ρk,h,T With the ρk,v,TCorresponding to being satisfied by during correlation upper limit threshold, t+1 TTI will be adjusted to the update cycles, realized to update cycle T Adjustment so that time interval that the user equipment updates next time extends.

Above-mentioned to be merely illustrative, the present invention is not construed as limiting to the specific adjustment mode of update cycle.

S406, the user equipment judge the ρk,h,TWith the ρk,v,TWhether corresponding lower correlation threshold value is met.

Specifically, the lower correlation threshold value ρ of user preset horizontal dimensionshdownWith the lower correlation threshold value of horizontal dimensions ρvdownIf the ρk,h,TMeet the lower correlation threshold value of the horizontal dimensions, such as ρk,h,Thdown, or, the ρk,v,TMeet that this hangs down The lower correlation threshold value of straight dimension, such as ρk,v,Tvup, then the user equipment perform step S407, otherwise, the user equipment is held Row step S408.

S407, the user equipment are it is determined that the ρk,h,TAnd/or the ρk,v,TCorresponding to satisfaction during lower correlation threshold value, subtract Small update cycle T.

Illustratively, current update cycle T is t TTI, and t is the positive integer more than 1, and the user equipment is it is determined that the ρk,h,T And/or the ρk,v,TCorresponding to satisfaction during lower correlation threshold value, t-1 TTI will be adjusted to the update cycles, realized to the update cycle T adjustment so that the time interval that the user equipment updates next time reduces.Wherein, if current update cycle T is equal to TTI, The update cycle, T was constant.

If it should be noted that the user equipment determines the ρk,h,TWith the ρk,v,TThe condition of update cycle is unsatisfactory for, i.e., should ρk,h,TAnd/or the ρk,v,TLess than corresponding correlation upper limit threshold, and the ρk,h,TWith the ρk,v,TUnder correlation corresponding to being all higher than Threshold value is limited, now, the user equipment is kept for the update cycle constant, performs step S408.

S408, the user equipment query feedback bit distribution list, it is vertical with this in the horizontal dimensions to obtain feedback bits The whole optional distribution combination of dimension.

Specifically, with reference to the Tables 1 and 2 in a upper embodiment, the user equipment is according to antenna configuration information inquiry pair The feedback bits distribution list answered, for example, the user equipment determines the antenna array structure of base station according to the antenna configuration information For 4 × 4, then the user equipment inquires about the feedback bits distribution list of 4 × 4 antenna array structures, obtains feedback bits in the water The optional distribution combination of flat dimension and vertical dimensions whole.

Alternatively, the user equipment can also be obtained by way of enclosed solution the feedback bits in the horizontal dimensions and The whole optional distribution combination of the vertical dimensions.

Illustratively, the user equipment passes through:

Ask for first number of bits of feedback bh, and by bv=B-bh, obtain second number of bits of feedback bv, B is total feedback The number of bit.

S409, the user equipment ask for the SINR of the Limited Feedback and ideal feedback using each group of optional distribution combination Difference.

Illustratively, the user equipment passes through:

The SINR of the Limited Feedback and ideal feedback difference is asked for, wherein, f is represented between Limited Feedback and ideal feedback SINR differences.

The optional distribution combination of the SINR differences within a preset range is defined as feedback bits point by S410, the user equipment With combination.

Illustratively, the preset range is [0,1], then passes through:

If the f values asked for are within the preset range, it is corresponding it is optional distribution combination i.e. meet the preparatory condition, it is necessary to Illustrate, optional distribution within preset range combination may have it is multigroup, now, it is preferred that multigroup optional at this The optional distribution combination for selecting the SINR differences between Limited Feedback and ideal feedback minimum in distribution combination is used as feedback bits Distribution combination.

The first code book that S411, the user equipment distribute the combination producing horizontal dimensions according to the feedback bits is vertical with this Second code book of dimension.

S412, the user equipment originally determine the precoding square of the horizontal dimensions according to first code book and the second code respectively Battle array instruction PMIhWith the pre-coding matrix instruction PMI of the vertical dimensionsv

S413, the user equipment combine feedback bits distribution, pre-coding matrix instruction PMIhWith the precoding square Battle array instruction PMIvSend to the base station.

Specifically, combination difference is distributed in the base station after feedback bits distribution combination is received according to the feedback bits Generation first code book and second code book consistent with user equipment, and according to the PMIhWith the PMIvIn first code book and The pre-coding matrix of horizontal dimensions and the pre-coding matrix of vertical dimensions are determined in second code book respectively, and to the horizontal dimensions Pre-coding matrix and vertical dimensions pre-coding matrix carry out tensor product obtain 3D pre-coding matrixes.

So, user equipment choose can make SINR differences between Limited Feedback and ideal feedback predetermined scope it Horizontal and vertical two dimensions are distributed in interior feedback bits distribution combination, and feedback bits combination divides more feedback bits The larger dimension of gain is assigned to, less feedback bits are distributed to the less dimension of gain so that the information pair of Limited Feedback The reflection of channel conditions is optimal, improves the feedback performance of Limited Feedback.

The embodiment of the present invention provides a kind of user equipment 50, corresponds to above-mentioned Fig. 3 embodiment of the method, the user equipment 50 Each functional unit is used equally for above method step.As shown in figure 5, the user equipment 50 includes:

Bit Distribution Unit 51, for the antenna array configuration information according to base station and horizontal and vertical two dimensions Channel condition information determines the feedback bits distribution combination for meeting preparatory condition.

The preparatory condition is the Signal to Interference plus Noise Ratio SINR of Limited Feedback and ideal feedback difference predetermined Within the scope of.

Code book generation unit 52, for distributed according to the feedback bits combination producing horizontal dimensions the first code book and should Second code book of vertical dimensions.

Quantifying unit 53, for originally determining the precoding square of the horizontal dimensions respectively according to first code book and the second code Battle array instruction PMIhWith the pre-coding matrix instruction PMI of the vertical dimensionsv

Feedback unit 54, for distributing the feedback bits to combination, pre-coding matrix instruction PMIhWith the precoding square Battle array instruction PMIvSend to the base station.

The intensity of the explanation of value, the intensity for the useful signal that the SINR represents to receive and the interference signal received Ratio, the SINR differences of Limited Feedback and ideal feedback are smaller, show the Limited Feedback closer to the ideal feedback, feedback Channel condition information is more accurate.

Alternatively, the user equipment also includes receiving unit 55, and the channel status for receiving base station transmission indicates reference Information CSI-RS and antenna array configuration information, the CSI-RS include the CSI-RS of the horizontal dimensions and the CSI- of the vertical dimensions RS, the antenna array configuration information include the antenna oscillator number N of horizontal dimensions and the antenna oscillator number M of vertical dimensions, should User equipment also includes channel estimating unit 56, and the CSI-RS for the CSI-RS according to the horizontal dimensions and the vertical dimensions is true The channel condition information h of the fixed horizontal dimensionsK, h(TTIt) and the vertical dimensions channel condition information hK, v(TTIt)。

Wherein, the CSI-RS is used for channel measurement, and TTI is Transmission Time Interval, hK, h(TTIt) represent to inscribe during t TTI User K is in the channel condition information of horizontal dimensions, hK, v(TTIt) represent to inscribe channels of the user K in vertical dimensions during t TTI Status information.

Alternatively, the Bit Distribution Unit 51 is specifically used for, and obtains feedback bits in the horizontal dimensions and the vertical dimensions Whole optional distribution combinations, the SINR of Limited Feedback and ideal feedback difference is asked for using each group of optional distribution combination It is different, determine the feedback bits at least one set of optional distribution combination of the difference of the SINR within the preset range is met Combination.Feedback bits combination includes the first number of bits of feedback b for horizontal dimensions distributionhWith distribute for the vertical dimensions Second number of bits of feedback bv

Alternatively, the Bit Distribution Unit 51 is additionally operable to, and mode is solved using enclosed:

Ask for this One number of bits of feedback bh, by bv=B-bh, obtain second number of bits of feedback bv, wherein, B be total feedback bits number, N For antenna for base station the horizontal dimensions antenna oscillator number, M be antenna for base station the vertical dimensions antenna oscillator number.

Wherein, the number of total feedback bits is the limited value set pre-defined, such as B belongs to section [8,14] Interior positive integer.

Alternatively, the Bit Distribution Unit 51 is additionally operable to, and inquires about default feedback bits distribution list, obtains feedback bits In the whole optional distribution combination of the horizontal dimensions and the vertical dimensions.

Illustratively, 4 × 4 antenna array structures of base station configuration, user is on the basis of known total number of bits of feedback, root According to the optimization allocation result under theoretical model, distribution combination of the feedback bits in horizontal and vertical dimension is preset, such as Fig. 3 side Shown in table 1 in method embodiment.Then the user equipment inquires about default feedback bits distribution list, obtains feedback bits described The optional distribution combination of horizontal dimensions and vertical dimensions whole.

Alternatively, the Bit Distribution Unit is additionally operable to, by:

The difference of the SINR is asked for, Wherein, f represents the Signal to Interference plus Noise Ratio SINR of Limited Feedback and ideal feedback difference, so, is by judge f It is no to can determine that the feedback bits distribution combination for meeting preparatory condition, it is necessary to which explanation, is within the preset range Within the preset range optional distribution combination may have it is multigroup, now, it is preferred that this it is multigroup it is optional distribution combination in select The optional distribution combination of SINR differences minimum between Limited Feedback and ideal feedback is as feedback bits distribution combination.

Alternatively, the user equipment also includes updating block 57, for updating feedback bits distribution according to update cycle T Combination, pre-coding matrix instruction PMIhWith pre-coding matrix instruction PMIv, the feedback unit 54 is additionally operable to, after renewal Feedback bits distribution combination, pre-coding matrix instruction PMIhWith pre-coding matrix instruction PMIvSend to the base station.

Alternatively, it is the positive integer more than or equal to 1 that update cycle T, which includes t Transmission Time Interval TTI, t,.

Alternatively, the updating block 57 is additionally operable to, by

Obtain the channel of the horizontal dimensions before the update With the channel relevancy ρ after renewalk,h,T;ByIt is somebody's turn to do The channel of vertical dimensions before the update with the channel relevancy ρ after renewalk,v,T;And according to the ρk,h,TWith the ρk,v,TAdjust this more New cycle T.

Wherein, the L is the total channel number of horizontal dimensions, and the R is the total channel number of vertical dimensions, the hk,h,l(nT) it is Channel condition information of the l articles channel of horizontal dimensions in n-th of cycle T, the h* k,h,i((n+1) T) is the hk,h,l(nT) be total to Yoke, the hk,v,l(nT) it is channel condition information of the l articles channel of vertical dimensions in n-th of cycle T, the h* k,v,i((n+1)T) For the hk,v,l(nT) conjugation, τlAnd τiThe time delay size of l articles of channel and i-th article of channel is represented respectively;

Further, the updating block 57 is specifically used for, in the ρk,h,TWith the ρk,v,TIt is satisfied by the default correlation upper limit During threshold value, increase update cycle T;In the ρk,h,TAnd/or the ρk,v,TWhen meeting default lower correlation threshold value, reducing should Update cycle T.

Using above-mentioned user equipment, the user equipment chooses the SINR differences that can make between Limited Feedback and ideal feedback Horizontal and vertical two dimensions are distributed in feedback bits distribution combination within the scope of predetermined, and feedback bits combination will be more Feedback bits distribute to the larger dimension of gain, less feedback bits are distributed to the less dimension of gain so that limited Reflection of the feedack to channel conditions is optimal, improves the feedback performance of Limited Feedback.

It is apparent to those skilled in the art that for convenience and simplicity of description, only with above-mentioned each function The division progress of module, can be as needed and by above-mentioned function distribution by different function moulds for example, in practical application Block is completed, i.e., the internal structure of device is divided into different functional modules, to complete all or part of work(described above Energy.The specific work process of the system, apparatus, and unit of foregoing description, it may be referred to corresponding in preceding method embodiment Journey, it will not be repeated here.

The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.

Claims (16)

  1. A kind of 1. method of Limited Feedback, it is characterised in that including:
    Determine to meet in advance according to the channel condition information of the antenna array configuration information of base station and horizontal and vertical two dimensions If the feedback bits distribution combination of condition, the preparatory condition is the Signal to Interference plus Noise Ratio of Limited Feedback and ideal feedback For SINR difference within the scope of predetermined, the feedback bits distribution combination distributes combination in horizontal and vertical dimension;
    The first code book of horizontal dimensions and the second code of the vertical dimensions according to the feedback bits distribute combination producing Originally, the pre-coding matrix instruction PMI of the horizontal dimensions and according to first code book and the second code is originally determined respectivelyhWith The pre-coding matrix instruction PMI of the vertical dimensionsv
    By feedback bits distribution combination, the pre-coding matrix instruction PMIhWith the pre-coding matrix instruction PMIvSend To the base station;
    Methods described also includes:The feedback bits distribution combination, the pre-coding matrix instruction are updated according to update cycle T PMIhWith the pre-coding matrix instruction PMIv, the update cycle T includes t Transmission Time Interval TTI, t for more than or equal to 1 positive integer;
    By the feedback bits distribution combination after renewal, the pre-coding matrix instruction PMIhWith the pre-coding matrix instruction PMIvSend to the base station.
  2. 2. according to the method for claim 1, it is characterised in that in the antenna array configuration information according to base station and Before the channel condition information of horizontal and vertical two dimensions determines to meet the feedback bits distribution combination of preparatory condition, including:
    Receive channel status instruction reference information CSI-RS and the antenna array configuration information that base station is sent;The CSI-RS The CSI-RS of CSI-RS and the vertical dimensions including the horizontal dimensions;The antenna array configuration information includes horizontal tie up The antenna oscillator number N of degree and the antenna oscillator number M of vertical dimensions;
    The channel status of the horizontal dimensions is determined according to the CSI-RS of the horizontal dimensions and the vertical dimensions CSI-RS Information hK, h(TTIt) and the vertical dimensions channel condition information hK, v(TTIt)。
  3. 3. according to the method for claim 1, it is characterised in that the antenna array configuration information and water according to base station The channel condition information of gentle vertical two dimensions determines to meet that the feedback bits distribution combination of preparatory condition specifically includes:
    Feedback bits are obtained in the whole optional distribution combination of the horizontal dimensions and the vertical dimensions;
    The SINR of Limited Feedback and ideal feedback difference is asked for using optional distribution combination described in each group;
    At least one set of optional distribution combination of the difference of the SINR within preset range is defined as the feedback bits group Close, the feedback bits combination includes the first number of bits of feedback b for horizontal dimensions distributionhDivide with for the vertical dimensions The the second number of bits of feedback b matched somebody with somebodyv
  4. 4. according to the method for claim 3, it is characterised in that the acquisition feedback bits are in horizontal dimensions and described The whole optional distribution combination of vertical dimensions includes:
    Mode is solved using enclosed:
    Ask for described first Number of bits of feedback bh
    By bv=B-bh, obtain the second number of bits of feedback bv, B is the number of total feedback bits.
  5. 5. according to the method for claim 3, it is characterised in that the acquisition feedback bits are in horizontal dimensions and described The whole optional distribution combination of vertical dimensions includes:
    Inquire about default feedback bits distribution list, it is in the horizontal dimensions and the vertical dimensions whole to obtain feedback bits Optional distribution combination.
  6. 6. according to the method for claim 3, it is characterised in that described to have been asked for using optional distribution combination described in each group Limit feedback and the SINR of ideal feedback difference include:
    ByAsk for the difference of the SINR;
    Wherein, f represents the Signal to Interference plus Noise Ratio SINR of Limited Feedback and ideal feedback difference;
    At least one set of optional distribution combination of the difference by the SINR within preset range is defined as the feedback ratio Spy's distribution combination includes:
    In at least one set of optional distribution combination of the difference of the SINR within the preset range is met, it is determined that described One group of minimum optional distribution of SINR difference is combined as the feedback bits distribution combination.
  7. 7. according to the method for claim 1, it is characterised in that methods described also includes:
    ByThe channel for obtaining the horizontal dimensions exists Channel relevancy ρ before renewal and after renewalk,h,T
    ByThe channel for obtaining the vertical dimensions exists Channel relevancy ρ before renewal and after renewalk,v,T
    Wherein, the L is the total channel number of horizontal dimensions, and the R is the total channel number of vertical dimensions, the hk,h,l(nT) For channel condition information of the l articles channel of horizontal dimensions in n-th of cycle T, the h* k,h,i((n+1) T) is the hk,h,l (nT) conjugation, the hk,v,l(nT) it is channel condition information of the l articles channel of vertical dimensions in n-th of cycle T, it is described h* k,v,i((n+1) T) is the hk,v,l(nT) conjugation, τlAnd τiRepresent that the time delay of l articles of channel and i-th article of channel is big respectively It is small;
    According to the ρk,h,TWith the ρk,v,TAdjust the update cycle T.
  8. 8. according to the method for claim 7, it is characterised in that described according to the ρk,h,TWith the ρk,v,TDescribed in adjustment more New cycle T includes:
    In the ρk,h,TWith the ρk,v,TWhen being satisfied by default correlation upper limit threshold, increase the update cycle T;
    In the ρk,h,TAnd/or the ρk,v,TWhen meeting default lower correlation threshold value, reduce the update cycle T.
  9. A kind of 9. user equipment, it is characterised in that including:
    Bit Distribution Unit, the channel shape for the antenna array configuration information according to base station and horizontal and vertical two dimensions State information determines the feedback bits distribution combination for meeting preparatory condition, and the preparatory condition is the letter of Limited Feedback and ideal feedback Number with difference of the interference plus noise than SINR within the scope of predetermined, the feedback bits distribution combination is in horizontal and vertical dimension Combination is distributed on degree;
    Code book generation unit, for the first code book of horizontal dimensions described in distributing combination producing according to the feedback bits and described Second code book of vertical dimensions;
    Quantifying unit, for originally determining the precoding square of the horizontal dimensions respectively according to first code book and the second code Battle array instruction PMIhWith the pre-coding matrix instruction PMI of the vertical dimensionsv
    Feedback unit, for distributing the feedback bits to combination, the pre-coding matrix instruction PMIhWith the pre-coding matrix Indicate PMIvSend to the base station;
    User equipment also includes updating block:For updating feedback bits distribution combination according to update cycle T, described prelisting Code matrix instruction PMIhWith the pre-coding matrix instruction PMIv, the update cycle T is including t Transmission Time Interval TTI, t Positive integer more than or equal to 1;
    The feedback unit is additionally operable to, by the feedback bits distribution combination after renewal, the pre-coding matrix instruction PMIhWith The pre-coding matrix instruction PMIvSend to the base station.
  10. 10. user equipment according to claim 9, it is characterised in that the user equipment also includes receiving unit, is used for Receive channel status instruction reference information CSI-RS and the antenna array configuration information that base station is sent;The CSI-RS includes described The CSI-RS of horizontal dimensions and the vertical dimensions CSI-RS;The antenna array configuration information includes the antenna of horizontal dimensions The antenna oscillator number M of oscillator number N and vertical dimensions;
    Channel estimating unit, the CSI-RS for the CSI-RS according to the horizontal dimensions and the vertical dimensions determine the water The channel condition information h of flat dimensionK, h(TTIt) and the vertical dimensions channel condition information hK, v(TTIt)。
  11. 11. user equipment according to claim 9, it is characterised in that the Bit Distribution Unit is specifically used for:
    Feedback bits are obtained in the whole optional distribution combination of the horizontal dimensions and the vertical dimensions;
    The SINR of Limited Feedback and ideal feedback difference is asked for using optional distribution combination described in each group;
    At least one set of optional distribution combination of the difference for meeting the SINR within preset range is defined as the feedback ratio Spy's combination, the feedback bits combination include the first number of bits of feedback b for horizontal dimensions distributionhWith for the vertical dimension Spend the second number of bits of feedback b of distributionv
  12. 12. user equipment according to claim 11, it is characterised in that the Bit Distribution Unit is additionally operable to:
    Mode is solved using enclosed:
    Ask for described first Number of bits of feedback bh
    By bv=B-bh, obtain the second number of bits of feedback bv, B is the number of total feedback bits, and N is antenna for base station in institute The antenna oscillator number of horizontal dimensions is stated, M is antenna oscillator number of the antenna for base station in the vertical dimensions.
  13. 13. user equipment according to claim 11, it is characterised in that the Bit Distribution Unit is additionally operable to:
    Inquire about default feedback bits distribution list, it is in the horizontal dimensions and the vertical dimensions whole to obtain feedback bits Optional distribution combination.
  14. 14. user equipment according to claim 11, it is characterised in that the Bit Distribution Unit is additionally operable to:
    By
    Ask for the difference of the SINR;
    Wherein, f represents the Signal to Interference plus Noise Ratio SINR of Limited Feedback and ideal feedback difference;
    In at least one set of optional distribution combination of the difference of the SINR within the preset range is met, it is determined that described One group of minimum optional distribution of SINR difference is combined as the feedback bits distribution combination.
  15. 15. user equipment according to claim 9, it is characterised in that the updating block is additionally operable to:
    ByThe channel for obtaining the horizontal dimensions exists Channel relevancy ρ before renewal and after renewalk,h,T
    ByThe channel for obtaining the vertical dimensions exists Channel relevancy ρ before renewal and after renewalk,v,T
    Wherein, the L is the total channel number of horizontal dimensions, and the R is the total channel number of vertical dimensions, the hk,h,l(nT) For channel condition information of the l articles channel of horizontal dimensions in n-th of cycle T, the h* k,h,i((n+1) T) is the hk,h,l (nT) conjugation, the hk,v,l(nT) it is channel condition information of the l articles channel of vertical dimensions in n-th of cycle T, it is described h* k,v,i((n+1) T) is the hk,v,l(nT) conjugation, τlAnd τiRepresent that the time delay of l articles of channel and i-th article of channel is big respectively It is small;
    According to the ρk,h,TWith the ρk,v,TAdjust the update cycle T.
  16. 16. user equipment according to claim 15, it is characterised in that the updating block is specifically used for:
    In the ρk,h,TWith the ρk,v,TWhen being satisfied by default correlation upper limit threshold, increase the update cycle T;
    In the ρk,h,TAnd/or the ρk,v,TWhen meeting default lower correlation threshold value, reduce the update cycle T.
CN201410514550.5A 2014-09-29 2014-09-29 A kind of method and apparatus of Limited Feedback information CN104243008B (en)

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