CN109302219A - Processing method, base station, user equipment and the computer-readable medium of precoding - Google Patents
Processing method, base station, user equipment and the computer-readable medium of precoding Download PDFInfo
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Abstract
A kind of processing method of precoding, base station, user equipment and computer-readable medium, the described method includes: in arbitrary information feedback subframe t, the first parameter information that user equipment is fed back is received and stored, first parameter information includes the first matrix W1(t) and third matrix W3(t) information, the first matrix W1(t) it is suitable for precoding aerial array or subarray, third matrix W3(t) coupled relation being suitable between precoding mutiple antennas array；In information feedback subframe t+1, the second parameter information that user equipment is fed back is received and stored, and updating third matrix according to the first parameter information and the second parameter information is W3(t+1), the second parameter information includes the first matrix W1(t+1) information；According to the first matrix W1(t+1) and third matrix is W3(t+1), data of the decoding Jing Guo precoding.Using the above scheme, the feedback rates of the treatment process of precoding can be reduced and save the communication resource.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a precoding processing method, a base station, a user equipment, and a computer readable medium.
Background
With the current development of information communication technology, various multimedia entertainment services are continuously developed and introduced into the market, so that the demand for wireless communication services is rapidly increasing worldwide. Accordingly, in order to actively cope with the increasing demand, the capacity of the communication service must be increased. Therefore, a Multiple-input Multiple-Output (MIMO) communication system is also being developed.
In the MIMO communication system, a plurality of transmitting antennas and a plurality of receiving antennas are respectively provided at a transmitting end and a receiving end, so that signals are transmitted and received through the plurality of antennas at the transmitting end and the receiving end, thereby increasing communication capacity, but it is inevitable that interference occurs between the plurality of antennas. In order to reduce interference and improve the reliability of the MIMO communication system, a precoding party is introducedA method for preparing a medical liquid. In the precoding scheme, if there is a multi-antenna array, the matrix W may be adopted1And W2To precode an antenna array or a sub-array of an antenna array, and may employ the matrix W3To precode the coupling relationships between the plurality of antenna arrays.
Currently, when each Channel State Information (CSI) feedback subframe, a User Equipment (UE) needs to feed back the matrix W to a Base Station (BS)1And matrix W3BS stores and uses said matrix W1And matrix W3And decoding the signals pre-coded by the UE.
However, the above precoding processing method has problems of an excessively high feedback rate and a waste of communication resources.
Disclosure of Invention
The problem solved by the embodiment of the invention is how to reduce the feedback rate of the precoding processing process and save communication resources.
In order to solve the above problem, an embodiment of the present invention provides a precoding processing method, where the method includes: receiving and storing first parameter information fed back by user equipment at any channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1Adapted to precode an antenna array or a certain sub-array of an antenna array, said third matrix W3Is suitable for precoding the coupling relation among a plurality of antenna arrays; receiving and storing second parameter information fed back by the user equipment at an adjacent next channel state information feedback subframe t +1, and updating a third matrix W of the current channel state information feedback subframe according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1); according to the first matrix W1(t +1), a second matrix W2(t +1) and the third matrix is W3(t +1) encoding data, and transmitting the encoded data to the user equipment.
Optionally, the third matrix W of the current channel state information feedback subframe3(t +1) satisfies the following formula:
wherein:feeding back the phase difference of the p-th antenna array relative to the first antenna array when the subframe (t +1) is used for channel state information, wherein p is the index of the antenna array, and the phase differenceIs caused by alignment errors and distance differences, j is the identity of the imaginary number.
Optionally, the antenna array structure is uniformly or non-uniformly arranged.
Optionally, the phase difference is when the antenna arrays are uniformly distributed on the antenna arrayWith respect to the third matrix W3(t +1) is an additive factor.
Optionally, the phase difference is when the antenna arrays are uniformly distributed on the antenna arrayThe following formula is satisfied:
wherein:feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array p, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array p, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2Is a two-dimensional vector length.
Optionally, the phase difference is when the antenna array is non-uniformly distributed over the antenna arrayWith respect to the third matrix W3(t +1) is a multiplication factor.
Optionally, the phase difference is when the antenna array is non-uniformly distributed over the antenna arrayThe following formula is satisfied:
wherein,feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2A vector length that is two-dimensional;the antenna distance ratio in the vertical direction M of the antenna array,is the antenna distance ratio in the horizontal direction N of the antenna array.
The embodiment of the invention provides a precoding processing method, which comprises the following steps: feeding back first parameter information to a base station at any channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) andthree matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) adapted to precode coupling relationships between a plurality of antenna arrays; feeding back second parameter information to the base station at the next adjacent channel state information feedback subframe t +1, so that the base station updates a third matrix of the current channel state information feedback subframe into W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1).
Optionally, the method further comprises: and in a channel state information feedback subframe t', judging whether the condition is met: (t'% Rw3) 0; wherein: t' > (t +1), and Rw3Is a third matrix W3The feedback scale factor of (2); feeding back the current third matrix W when it is determined that the condition is satisfied3(t’)。
An embodiment of the present invention provides a base station, where the base station includes: a storage unit, adapted to receive and store first parameter information fed back by a user equipment at an arbitrary channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1Adapted to precode an antenna array or a certain sub-array of an antenna array, said third matrix W3Is suitable for precoding the coupling relation among a plurality of antenna arrays; an updating unit, adapted to receive and store the second parameter information fed back by the user equipment in the next adjacent channel state information feedback subframe t +1, and update the third matrix of the current channel state information feedback subframe to be W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1); an encoding unit adapted to encode the first matrix W1(t +1), a second matrix W2(t +1) and the third matrix is W3(t +1) encoding data, and transmitting the encoded data to the user equipment.
Optionally, the third matrix W of the current channel state information feedback subframe3(t +1) satisfies the following formula:
wherein:feeding back the phase difference of the p-th antenna array relative to the first antenna array when the subframe (t +1) is used for channel state information, wherein p is the index of the antenna array, and the phase difference Is caused by alignment errors and distance differences, j is the identity of the imaginary number.
Optionally, the antenna array structure is uniformly or non-uniformly arranged.
Optionally, the phase difference is when the antenna arrays are uniformly distributed on the antenna arrayWith respect to the third matrix W3(t +1) is an additive factor.
Optionally, the phase difference is when the antenna arrays are uniformly distributed on the antenna arrayThe following formula is satisfied:
wherein:feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2Is a two-dimensional vector length.
Optionally, the phase difference is when the antenna array is non-uniformly distributed over the antenna arrayWith respect to the third matrix W3(t +1) is a multiplication factor.
Optionally, the phase difference is when the antenna array is non-uniformly distributed over the antenna arrayThe following formula is satisfied:
wherein,feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2A vector length that is two-dimensional;the antenna distance ratio in the vertical direction M of the antenna array,is the antenna distance ratio in the horizontal direction N of the antenna array.
The embodiment of the present invention provides a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of any one of the precoding processing methods when executing the computer instructions.
Embodiments of the present invention provide a computer readable medium having stored thereon computer instructions which, when executed, perform the steps of any of the above-described methods.
The embodiment of the invention provides user equipment, which comprises a first feedback unit and a second feedback unit, wherein the first feedback unit is suitable for feeding back first parameter information to a base station in any channel state information feedback subframe t, and the second feedback unit comprises: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) adapted to precode coupling relationships between a plurality of antenna arrays; a second feedback unit, adapted to feed back second parameter information to the base station at a next adjacent channel state information feedback subframe t +1, so that the base station updates a third matrix of the current channel state information feedback subframe to be W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1).
Optionally, the user equipment further includes: a judging unit, adapted to judge whether the condition is satisfied at the channel state information feedback subframe t': (t'% Rw3) 0; wherein: t' > (t +1), and Rw3Is a third matrix W3The feedback scale factor of (2); the second feedback unit is further adapted to feed back the current third matrix W when it is determined that the condition is satisfied3(t’)。
The embodiment of the present invention provides a user equipment, which includes a memory and a processor, where the memory stores computer instructions capable of running on the processor, and the processor executes the steps of any one of the above precoding processing methods when executing the computer instructions.
Embodiments of the present invention provide a computer readable medium having stored thereon computer instructions which, when executed, perform the steps of any of the above-described methods.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
in the above scheme, when the channel state information feeds back the subframe (t +1), the base station may feed back the subframe according to the first parameter information and the first matrix W1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the user equipment only needs to feed back to the base station the matrix W including the first matrix1(t +1) without feedback to the base station while including the first matrix W1(t +1) and a third matrix W3And (t +1), so that the feedback rate of the precoding processing process can be reduced, and further communication resources are saved.
Furthermore, different third matrix calculation modes are adopted for different antenna array structures, so that the pertinence can be improved, and the accuracy of precoding processing can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a panel including a multi-antenna array according to an embodiment of the present invention;
fig. 2 is a flowchart of a precoding processing method in an embodiment of the present invention;
fig. 3 is a non-uniformly distributed antenna array in an embodiment of the present invention;
fig. 4 is a flowchart of a precoding processing method in an embodiment of the present invention;
fig. 5 is a schematic signaling interaction diagram of a precoding process in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a base station in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a user equipment in an embodiment of the present invention.
Detailed Description
New Radio (NR) codebooks have been discussed many times in the industry meeting of 3 GPP. And a possible structure of a codebook for a multi-antenna array is currently also discussed. Matrix W1And W2Characterizing a dual-order codebook, the matrix W in a multi-antenna array structure1And W2For precoding an antenna array or a sub-array of an antenna array, the matrix W may be used3To precode the coupling relationships between the plurality of antenna arrays.
Fig. 1 shows a schematic structural diagram of a panel including a multi-antenna array, where the total length Mg of the panel is 2, the total width Ng of the panel is 2, the entire panel includes M × N sub-panels, M is 4, N is 8, and 4 sub-panels are respectively panel0, panel 1, panel 2, and panel 3. Each panel has a plurality of criss-crossed antenna arrays. I isM,1Longitudinal distance, I, of two antenna arrays representing the same sub-panelN,1Representing the lateral distance, I, of two antenna arrays of the same sub-panelM,2Indicating the longitudinal distance, I, of two antenna arrays of two adjacent sub-panelsN,2The lateral distance of the two antenna arrays of two adjacent sub-panels is indicated.
The combined precoding matrix W may satisfy formula (1):
wherein, W1Comprising a two-dimensional DFT vector of size M × N, W3Is a vertical vector of size Mg × Ng and including antenna array coupling coefficients. SymbolDenotes the kronecker operation, IxRepresenting an identity matrix of size x. And matrix W2Containing coefficients for linearly combining multiple DFT vectors and polarizations.
Also, in a multi-panel application scenario, i.e., in the case of a multi-antenna array, the optimal precoder phase difference between the panels depends on the horizontal or vertical distance between the last antenna array in the first panel and the first antenna array in the second panel. And the phase difference may further include calibration error compensation.
For ease of understanding, a simple case may be considered where two adjacent panels in a multi-panel use a one-dimensional DFT. Parameter u at this timemAnd the distance between the two calibration panels described above is such that the distance between the antennas within the panels is equal to the distance of the last and first antennas on different panels. In other words, the antenna array is uniformly linear across several panels. In fact, the parameter umIs different from the phase difference between the parameter k-1 and the parameter kSatisfies the following formula (2):
and, the phase difference between the vectorsSatisfies the following formula (3):
in special cases where oversampling is not used, e.g. O2When the value is equal to 1, the reaction solution is,always withEqual because the following formula (4) is satisfied:
if additional phase adjustment is required, phase adjustment due to, for example, different spacing between panels or due to calibration errors, can be embedded in W3In a matrix. W may actually be defined3But these parameters are at least equal to umIs related to the phase difference between the last and first elements. Similar definitions apply to parameter umAnd a parameter vm. The above description is all assumed to use the same W for all panels1And W2On the premise of (1).
However, if the parameter O1And O2At least one is greater than 1, then a matrix W will appear3Depends on the choice of the parameters m and n. And if the matrix W3Has a feedback rate lower than W1The selection problem can be solved.
At present, when each Channel State Information (CSI) feedback subframe, a User Equipment (UE) needs to feed back the matrix W to a Base Station (BS)1And matrix W3BS stores and uses said matrix W1And matrix W3And decoding the signals pre-coded by the UE. Therefore, the above precoding processing method still has the problems of too high feedback rate and waste of communication resources.
To solve the above problem, the base station in the embodiment of the present invention is configured to determine the first parameter information according to the first parameter information and the first matrix W1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the user equipment only needs to feed back to the base station the matrix W including the first matrix1(t+1)Without feeding back to the base station while including the first matrix W1(t +1) and a third matrix W3And (t +1), so that the feedback rate of the precoding processing process can be reduced, and further communication resources are saved.
In order to make the aforementioned objects, features and advantages of the embodiments of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.
Fig. 2 shows a flowchart of a precoding processing method in an embodiment of the present invention, and the method is described in detail with reference to fig. 2 in steps, and may be implemented according to the following steps:
step S21: and receiving and storing the first parameter information fed back by the user equipment in any channel state information feedback subframe t.
In a specific implementation, the first parameter information may further include a second matrix W2(t) information, second matrix W2Adapted to combine from W1DFT beams and polarizations. A second matrix W2The following formula (5) may be satisfied:
e.g. W for each antenna array2Same phi ispIt may be equal to the compensation factor of each antenna array with respect to the first antenna array panel 0. In a specific implementation, the first parameter Information may include a first matrix W of a current Channel State Information (CSI) feedback subframe t1(t) and a third matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) is adapted to precode coupling relationships between the plurality of antenna arrays.
In an implementation, for the antenna array shown in fig. 1The matrix W1Equation (6) can be satisfied:
in general, W1Parameter b inlCan be equal to the oversampled 2D DFT vector, in other words, the parameter blThe following formula (7) can be satisfied:
suppose that the vertical DFT vector component m ∈ [0, O ]2N2-1]And the horizontal DFT vector component n ∈ [0, O ]1N1-1]Therein, the parameter umAnd vnSatisfy formulas (8) and (9), respectively:
wherein, O1、O2、N1And N2Respectively DFT oversampling factor and two-dimensional vector length. In general, all blThe vectors all need to satisfy equation (10):
if i is not equal to j or equal, the parameter blThe following formula (11) may be satisfied:
BHB＝I (11)
in a specific embodiment, the first and second electrodes are,equal to the compensation factor of any one antenna array p with respect to the first antenna array panel0, and a third matrix W3Satisfies the following formula (12):
step S22: receiving and storing second parameter information fed back by the user equipment at an adjacent next channel state information feedback subframe t +1, and updating a third matrix W of the current channel state information feedback subframe according to the first parameter information and the second parameter information3(t+1)。
In a specific implementation, the second parameter information includes a first matrix W of a current channel state information feedback subframe1(t +1) information without the need for a third matrix W including a current channel state information feedback subframe3(t +1), therefore W can be reduced3The feedback rate of the communication system can further save communication resources.
In a specific implementation, a first matrix W of channel state information feedback sub-frames t is assumed1(t) is based on DFT indices m (t) and n (t). Third matrix W3(t) is also fed back, and the third matrix W3(t) satisfies the following formula (13):
and, in the channel state information feedback subframe t +1, the user equipment also feeds back DFT indexes m (t +1) and n (t +1) to the base station.
Therefore, the third matrix W of the current channel state information feedback sub-frame3(t +1) may satisfy the following formula (14):
wherein:feeding back the phase difference of the p-th antenna array relative to the first antenna array when the sub-frame (t +1) is the channel state information, wherein p is the index of the antenna array, p is more than 0, and the phase difference Are caused by alignment errors and distance differences.
In a specific implementation, the antenna array structures may be various, and may be arranged uniformly or non-uniformly, for example. And, the difference of the antenna array structure, phase differenceWith respect to the third matrix W3The contribution of (t +1) or the influence of the calculation result is not the same. In particular, the method of manufacturing a semiconductor device,
when the antenna arrays are uniformly distributed on the antenna array, the phase differenceWith respect to the third matrix W3(t +1) is an additive factor. And when the antenna array on the antenna array is non-uniformly distributed, the phase differenceWith respect to the third matrix W3(t +1) is a multiplication factor. In a specific implementation, when the antenna arrays are uniformly distributed on the antenna array, the phase difference is applied to each sub-panelThe following formula (15) can be satisfied:
wherein:feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each factor.
Wherein,feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2Is a two-dimensional vector length.
And, more specifically,the following formula (16) may be satisfied:
the following formula (17) may be satisfied:
the following formula (18) can be satisfied:
the following formula (19) can be satisfied:
wherein u ism,kIs equal to umIs equal to the phase. It is noted that since B satisfies the orthogonality constraint shown by equation (11), B is set for all mutually orthogonal vectorsjParameter ofAnd parametersAre all equal.
And, in particular implementations, may depend on the parametersumPhase of last element and parameter v corresponding to sub-frame t and t +1nSub-frames t and t +1 time umAnd vnBetween different elements ofPhase difference, calculation parameter
For ease of understanding, fig. 3 illustrates a non-uniformly distributed antenna array in an embodiment of the present invention. It should be noted that fig. 3 is defined based on the departure Angle (AOD) in the horizontal direction only, and the same applies based on the azimuth angle (ZOD) in the vertical direction.
Referring to fig. 3, the signal phase difference α between the lowest antenna and the antenna closest thereto1Satisfies formula (20):
α1＝2πx1/λ (20)
wherein: λ and x1Equal to the wavelength and distance difference, respectively, and, correspondingly, the phase difference α2Satisfies the following formula (21):
α2＝2πx2/λ (21)
on the other hand, referring to FIG. 3, the departure Angle (AOD) can be seenSatisfies formula (22):
based on the above, the phase difference between the panelsSatisfies formula (23):
therefore, the signal information is based on the following equations (24) to (26):
equation (27) can be obtained:
in specific implementation, the formula (27) may be finally substituted into the formula (15) to obtain the phase difference when the antenna array is non-uniformly distributed on the antenna arrayThe following formula (28) can be satisfied:
wherein,feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor in
And, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2A vector length that is two-dimensional;the antenna distance ratio in the vertical direction M of the antenna array,is the antenna distance ratio in the horizontal direction N of the antenna array.
Step S23: according to the first matrix W1(t +1) and the third matrix is W3(t +1), the precoded data is decoded.
In a specific implementation, the base station may directly depend on the first matrix W1(t +1) and the third matrix is W3(t +1) to decode the precoded data, thereby improving the reliability of the communication between the base station and the user equipment.
In particular implementations, the base station may obtain calibration error informationFurther to the calibration error informationBy substituting equation (28), a simplified equation (29) can be obtained:
in the prior art, in each subframe, the ue needs to feed back the first matrix W corresponding to the current time to the base station1And a third matrix W3。
The base station in the embodiment of the invention is based on the first parameter information and the first matrix W1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the user equipment only needs to feed back to the base station the matrix W including the first matrix1(t +1) without feedback to the base station while including the first matrix W1(t +1) and a third matrix W3And (t +1), so that the feedback rate of the precoding processing process can be reduced, and further communication resources can be saved. For better understanding and implementing the present invention by those skilled in the art, fig. 4 shows a flowchart of a precoding processing method in the embodiment of the present invention, and as shown in fig. 4, the method may include the steps of:
step S41: and feeding back the first parameter information to the base station at any channel state information feedback subframe t.
In a specific implementation, the first parameter information includes a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) is adapted to precode coupling relationships between the plurality of antenna arrays.
In a specific implementation, the first parameter information may further include a second matrix W2(t) information, second matrix W2Adapted to combine from W1DFT beams and polarizations.
Step S42: feeding back second parameter information to the base station at the adjacent next channel state information feedback subframe t +1, so that the base station updates the current information according to the first parameter information and the second parameter informationThe third matrix of the channel state information feedback sub-frame is W3(t+1)。
In a specific implementation, the second parameter information includes a first matrix W of a current channel state information feedback subframe1Information of (t + 1).
To reduce W3In the specific implementation, the ue may also feedback the subframe t' in the csi to determine whether the condition is satisfied: (t'% Rw3) When it is determined that the condition is satisfied, the current third matrix W is fed back3(t'). Wherein: t' > (t +1), and Rw3Is a third matrix W3The feedback scaling factor of (1).
In summary, when the ue in the embodiment of the present invention feeds back the subframe (t +1) with the channel state information, it only feeds back the first matrix W1(t) and the base station may be based on the first parameter information and the first matrix W1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the feedback rate of the precoding processing process can be reduced, and further the communication resources can be saved.
For those skilled in the art to better understand and implement the present invention, fig. 5 shows a signaling interaction diagram of a precoding processing procedure in the embodiment of the present invention, and as shown in fig. 5, the signaling interaction procedure may be implemented according to the following steps:
step S51: in the CSI feedback subframe t, the user equipment feeds back a first matrix W to the base station1(t), a second matrix W2(t) and a third matrix W3(t) information.
Step S52: the base station saves a first matrix W1(t), a second matrix W2(t) and a third matrix W3(t) information.
Step S53: in the CSI feedback subframe t +1, the user equipment feeds back a first matrix W at the current moment to the base station1(t +1) and a second matrix W2Information of (t + 1).
Step S54: the base station stores a first matrix W of the current time1(t +1) and a second matrix W2(t +1) information, and based on W1(t)、W1(t +1) and a third matrix W3(t) information for updating the third matrix W at the current time3Information of (t + 1).
Step S55: in the CSI feedback subframe t +2, the user equipment feeds back a first matrix W to the base station1(t +2), a second matrix W2(t +2) and a third matrix W3(t + 2).
Step S56: the base station saves a first matrix W1(t +2), a second matrix W2(t +2) and a third matrix W3(t + 2).
In summary, in the embodiment of the present invention, the ue feeds back the first matrix W to the base station in the subframe t +11(t +1), the base station may determine the first parameter information and the first matrix W1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the UE does not need to feedback to the BS while including the first matrix W1(t +1) and a third matrix W3And (t +1), so that the feedback rate of the precoding processing process can be reduced, and further communication resources can be saved.
In order to make those skilled in the art better understand and implement the present invention, fig. 6 shows a schematic structural diagram of a base station in an embodiment of the present invention, and as shown in fig. 6, the base station may include: a storage unit 61, an update unit 62, and an encoding unit 63, wherein:
a storage unit 61, adapted to receive and store the first parameter information fed back by the user equipment at an arbitrary channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1Adapted to precode an antenna array or a certain sub-array of an antenna array, said third matrix W3Adapted for precoding coupling between a plurality of antenna arraysA relationship;
an updating unit 62, adapted to receive and store the second parameter information fed back by the ue in the next adjacent csi feedback subframe t +1, and update the third matrix of the current csi feedback subframe to be W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1);
an encoding unit 63 adapted to encode a first matrix W based on the first matrix W1(t +1), a second matrix W2(t +1) and the third matrix is W3(t +1) encoding data, and transmitting the encoded data to the user equipment.
In summary, the updating unit 62 of the base station according to the embodiment of the present invention can be configured to update the first matrix W according to the first parameter information1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the user equipment only needs to feed back to the base station the matrix W including the first matrix1(t +1) without feedback to the base station while including the first matrix W1(t +1) and a third matrix W3And (t +1), so that the feedback rate of the precoding processing process can be reduced, and further communication resources can be saved.
In a specific implementation, the third matrix W of the current csi feedback subframe3(t +1) satisfies the following formula:wherein:feeding back the phase difference of the p-th antenna array relative to the first antenna array when the subframe (t +1) is used for channel state information, wherein p is the index of the antenna array, and the phase differenceIs caused by alignment errors and distance differences, j being the identity of an imaginary number。
In a specific implementation, the antenna array structure is uniformly or non-uniformly arranged.
In one embodiment, the phase difference is uniform when the antenna arrays are uniformly distributed on the antenna arrayWith respect to the third matrix W3(t +1) is an additive factor.
In one embodiment, the phase difference is uniform when the antenna arrays are uniformly distributed on the antenna arrayThe following formula is satisfied:
wherein:feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each factor.
Wherein,feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) as an antenna arrayHorizontally indexed, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2Is a two-dimensional vector length.
In particular implementations, the phase difference is when the antenna array is non-uniformly distributed over the antenna arrayWith respect to the third matrix W3(t +1) is a multiplication factor.
In particular implementations, the phase difference is when the antenna array is non-uniformly distributed over the antenna arrayThe following formula is satisfied:
wherein,feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnThe phase of each factor.
Wherein M isg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2A vector length that is two-dimensional;the antenna distance ratio in the vertical direction M of the antenna array,is the antenna distance ratio in the horizontal direction N of the antenna array.
In order to make those skilled in the art better understand and implement the present invention, fig. 7 shows a schematic structural diagram of a user equipment in an embodiment of the present invention, as shown in fig. 7, the user equipment may include a first feedback unit 71 and a second feedback unit 72, where:
a first feedback unit 71, adapted to feed back first parameter information to the base station at an arbitrary csi feedback subframe t, where: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) adapted to precode coupling relationships between a plurality of antenna arrays;
a second feedback unit 72, adapted to feed back second parameter information to the base station at a next adjacent channel state information feedback subframe t +1, so that the base station updates a third matrix of the current channel state information feedback subframe to be W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information includes a currentFirst matrix W of channel state information feedback sub-frame1Information of (t + 1).
In summary, the second feedback unit 72 in the embodiment of the present invention only feeds back the first matrix W when the channel state information feeds back the subframe (t +1)1(t) and the base station may be based on the first parameter information and the first matrix W1The information of (t +1) updates a third matrix corresponding to the current subframe to be W3(t +1), so the feedback rate of the precoding processing process can be reduced, and further the communication resources can be saved.
In order to achieve both the reduction of the feedback rate and the improvement of the communication reliability, in an implementation, the ue may further include: a judging unit (not shown), and the judging unit may be adapted to judge whether the condition is satisfied at the channel state information feedback subframe t': (t'% Rw3) 0; wherein: t' > (t +1), and Rw3Is a third matrix W3The feedback scaling factor of (1). The second feedback unit 72 is further adapted to feed back the current third matrix W when it is determined that the condition is satisfied3(t’)。
The embodiment of the invention provides a computer readable medium, on which computer instructions are stored, and the computer instructions execute the steps of any one of the methods corresponding to the method in fig. 3 when executed.
The embodiment of the invention provides a computer readable medium, on which computer instructions are stored, and the computer instructions execute the steps of any one of the methods corresponding to the method in fig. 4 when running.
An embodiment of the present invention provides a base station, including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes, when executing the computer instructions, the steps of the precoding processing method described in any one of fig. 3.
The embodiment of the present invention provides a user equipment, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of any one of the precoding processing methods described in fig. 4 when executing the computer instructions.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (22)
1. A method for precoding, comprising:
receiving and storing first parameter information fed back by user equipment at any channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1Adapted to precode an antenna array or a certain sub-array of an antenna array, said third matrix W3Adapted for precoding between a plurality of antenna arraysA coupling relationship;
receiving and storing second parameter information fed back by the user equipment at an adjacent next channel state information feedback subframe t +1, and updating a third matrix W of the current channel state information feedback subframe according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1);
according to the first matrix W1(t +1), a second matrix W2(t +1) and the third matrix is W3(t +1) encoding data, and transmitting the encoded data to the user equipment.
2. The precoding processing method of claim 1, wherein the third matrix W of the current channel state information feedback sub-frame3(t +1) satisfies the following formula:
wherein:feeding back the phase difference of the p-th antenna array relative to the first antenna array when the subframe (t +1) is used for channel state information, wherein p is the index of the antenna array, and the phase differenceIs caused by alignment errors and distance differences, j is the identity of the imaginary number.
3. The precoding processing method of claim 2, wherein the antenna array structure is uniformly or non-uniformly arranged.
4. The precoding processing method of claim 3, wherein the antenna array is an upper antennaWhen the linear array is uniformly distributed, the phase differenceWith respect to the third matrix W3(t +1) is an additive factor.
5. The precoding processing method of claim 4 wherein the phase difference is uniform when the antenna arrays are uniformly distributed over the antenna arrayThe following formula is satisfied:
wherein:feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array p, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array p, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2Is a two-dimensional vector length.
6. The precoding processing method of claim 3, wherein the phase difference is not uniformly distributed when the antenna arrays on the antenna array are non-uniformly distributedWith respect to the third matrix W3(t +1) is a multiplication factor.
7. The precoding processing method of claim 6, wherein the phase difference is not uniformly distributed when the antenna arrays on the antenna array are non-uniformly distributedThe following formula is satisfied:
wherein,feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),is in the shape of a channelSubframe tth v of state information feedbacknPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2A vector length that is two-dimensional;the antenna distance ratio in the vertical direction M of the antenna array,is the antenna distance ratio in the horizontal direction N of the antenna array.
8. A method for precoding, comprising:
feeding back first parameter information to a base station at any channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) adapted to precode coupling relationships between a plurality of antenna arrays;
feeding back second parameter information to the base station at the next adjacent channel state information feedback subframe t +1, so that the base station updates a third matrix of the current channel state information feedback subframe into W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1).
9. The precoding processing method of claim 8, further comprising:
and in a channel state information feedback subframe t', judging whether the condition is met: (t'% Rw3) 0; wherein: t' > (t +1), and Rw3Is a third matrix W3The feedback scale factor of (2);
feeding back the current third matrix W when it is determined that the condition is satisfied3(t’)。
10. A base station, comprising:
a storage unit, adapted to receive and store first parameter information fed back by a user equipment at an arbitrary channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1Adapted to precode an antenna array or a certain sub-array of an antenna array, said third matrix W3Is suitable for precoding the coupling relation among a plurality of antenna arrays;
an updating unit, adapted to receive and store the second parameter information fed back by the user equipment in the next adjacent channel state information feedback subframe t +1, and update the third matrix of the current channel state information feedback subframe to be W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1);
an encoding unit adapted to encode the first matrix W1(t +1), a second matrix W2(t +1) and the third matrix is W3(t +1) encoding data, and transmitting the encoded data to the user equipment.
11. The base station of claim 10, wherein the third matrix W of the current channel state information feedback subframe3(t +1) satisfies the following formula:
wherein:feeding back the phase difference of the p-th antenna array relative to the first antenna array when the subframe (t +1) is used for channel state information, wherein p is the index of the antenna array, and the phase difference Caused by alignment errors and distance differences.
12. The base station of claim 11, wherein the antenna array structure is uniformly or non-uniformly arranged.
13. The base station of claim 12 wherein the phase difference is uniform when the antenna arrays are uniformly distributed on the antenna arrayWith respect to the third matrix W3(t +1) is an additive factor.
14. The base station of claim 13 wherein the phase difference is uniform when the antenna arrays are uniformly distributed on the antenna arrayThe following formula is satisfied:
wherein:feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2Is a two-dimensional vector length.
15. The base station of claim 12 wherein the phase difference is non-uniformly distributed when the antenna array is on the antenna arrayWith respect to the third matrix W3(t +1) is a multiplication factor.
16. The base station of claim 15 wherein the phase difference is non-uniformly distributed when the antenna array is on the antenna arrayThe following formula is satisfied:
wherein,feeding back sub-frame tth u for channel state informationmThe phase of the last factor in the phase,feedback of sub-frame ttime for channel state informationnThe phase of the last factor in the phase,feeding back sub-frame tth u for channel state informationmThe phase of each of the factors in (a),feedback of sub-frame ttime for channel state informationnPhase of each factor, Mg(p) is the vertical index of the antenna array, and satisfies Mg(p)∈[1,Mg-1]，Ng(p) is a horizontal index of the antenna array, and satisfies Ng(p)∈[1,Ng-1]；umAnd vnIs a DFT vector and satisfies m ∈ [0, O ]2N2-1]，n∈[0,O1N1-1]，O1And O2For DFT oversampling factor, N1And N2A vector length that is two-dimensional;the antenna distance ratio in the vertical direction M of the antenna array,is the antenna distance ratio in the horizontal direction N of the antenna array.
17. A user device, comprising:
a first feedback unit, adapted to feed back first parameter information to a base station in an arbitrary channel state information feedback subframe t, wherein: the first parameter information comprises a first matrix W of a current channel state information feedback subframe1(t) and a third matrix W3(t) information of the first matrix W1(t) adapted to precode one antenna array or a certain sub-array of one antenna array, said third matrix W3(t) adapted to precode coupling relationships between a plurality of antenna arrays;
a second feedback unit, adapted to feed back second parameter information to the base station at a next adjacent channel state information feedback subframe t +1, so that the base station updates a third matrix of the current channel state information feedback subframe to be W according to the first parameter information and the second parameter information3(t +1), wherein: the second parameter information comprises a first matrix W of a current channel state information feedback subframe1Information of (t + 1).
18. The user equipment of claim 17, further comprising:
a judging unit, adapted to judge whether the condition is satisfied at the channel state information feedback subframe t': (t'% Rw3) 0; wherein: t' > (t +1), and Rw3Is a third matrix W3The feedback scale factor of (2); the second feedback unit is further adapted to feed back the current third matrix W when it is determined that the condition is satisfied3(t’)。
19. A computer readable medium having computer instructions stored thereon for performing the steps of the method of any one of claims 1 to 7 when the computer instructions are executed.
20. A computer readable medium having computer instructions stored thereon for performing the steps of the method of any one of claims 8 to 9 when the computer instructions are executed.
21. A base station comprising a memory and a processor, said memory having stored thereon computer instructions executable on said processor, characterized in that said processor, when executing said computer instructions, performs the steps of the precoding processing method of anyone of the claims 1 to 7.
22. A user equipment comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, the processor when executing the computer instructions performing the steps of the pre-coding processing method of any of claims 8 to 9.
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