CN106992805A - Multi-antenna transmission method, base station and user terminal - Google Patents
Multi-antenna transmission method, base station and user terminal Download PDFInfo
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- CN106992805A CN106992805A CN201610040786.9A CN201610040786A CN106992805A CN 106992805 A CN106992805 A CN 106992805A CN 201610040786 A CN201610040786 A CN 201610040786A CN 106992805 A CN106992805 A CN 106992805A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
Abstract
The invention discloses a kind of multi-antenna transmission method, base station and user terminal.When method is applied to base station, including：By antenna array partition at least one sub-array antenna；The first upward signal sent according to the user terminal UE received estimates the transmitting terminal relevance parameter of each sub-array antenna；And, for each sub-array antenna, wave beam forming is carried out to downlink reference signal according to transmitting terminal relevance parameter, the downlink reference signal after wave beam forming is sent to UE by the sub-array antenna.A kind of this method, base station and the user terminal of the present invention, using the teaching of the invention it is possible to provide multi-antenna transmitting transmission scheme for taking into account performance and complexity.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of multi-antenna transmission method, base station and user terminal.
Background technology
In a wireless communication system, wish to be communicated with base station to be serviced while there are numerous users.At this
In a little scenes, it can be realized using the transmission plan of multi-user's multiple-input and multiple-output (MU-MIMO) while dispatching multiple users.With
The development of antenna technology, large-scale antenna array system (AAS) is just gradually applied to base station.This extensive AAS is generally wrapped
Hundreds of bays (such as 128,256 or more) are included, these array elements can line up a panel type as face battle array day
Line is used.By installing AAS in base station end, radio communication can be provided to more users simultaneously.
Due to using extensive AAS in the confined space of base station end, the spatial coherence of radio propagation channel is higher, especially
Its scene for user's dense distribution.In this case, in order to ensure the power system capacity of wireless communication system, in theory may be used
To carry out multi-antenna transmission using nonlinear precoding method.But, the implementation complexity of nonlinear precoding method is with day
The increase of line number and become unacceptable.Therefore, it is necessary to design a kind of many of low complex degree in the scene of high spatial correlation
Antenna transmission scheme.
The content of the invention
The invention provides a kind of multi-antenna transmission method, base station and user terminal, high spatial correlation can be applied to
Scene, and taken into account low computation complexity and systematic function.
Specifically, the technical scheme of the embodiment of the present invention is realized in：
A kind of multi-antenna transmission method, applied to base station, methods described includes：
By antenna array partition at least one sub-array antenna；
The first upward signal sent according to the user terminal UE received estimates the transmitting terminal phase of each sub-array antenna
Closing property parameter；And,
For each sub-array antenna, wave beam tax is carried out to downlink reference signal according to the transmitting terminal relevance parameter
Shape, the UE is sent to by the downlink reference signal after wave beam forming by the sub-array antenna.
It is described that downlink reference signal progress wave beam forming is included according to the transmitting terminal relevance parameter：
Calculated according to the transmitting terminal relevance parameter and obtain characteristic parameter, according to the characteristic parameter to the descending ginseng
Examine signal and carry out wave beam forming.
The transmitting terminal relevance parameter is transmitting terminal correlation matrix, and the characteristic parameter is related to the transmitting terminal
Property matrix the corresponding characteristic vector of eigenvalue of maximum, and/or, time big characteristic value phase with the transmitting terminal correlation matrix
Corresponding characteristic vector.
Methods described further comprises：
The beam selection information of the UE feedbacks is received, and user is dispatched according to the beam selection information received.
The beam selection information scheduling user that the basis is received includes：
The sub-array antenna that the UE is selected is determined according to the beam selection information；
The sub-array antenna selected according to scheduling homeostatic principle and the UE, the UE is grouped, obtained and each
The corresponding one group of UE to be dispatched of sub-array antenna；
Determine and used using the scheduling of the corresponding sub-array antenna transmission data of group UE to be dispatched for every group of UE to be dispatched
Family.
Methods described further comprises：
Descending control signaling is sent to each scheduling user to send on second to the base station to trigger each scheduling user
Row signal；
Precoding is carried out to the data of each scheduling user based on second upward signal, and by the data after precoding
It is sent to each scheduling user.
It is described that the data progress precoding of each scheduling user is included based on second upward signal：
The downlink channel condition information of each scheduling user is estimated according to second upward signal；
According to the downlink channel condition information of all scheduling users, calculating obtains the first pre-coding matrix；
According to the downlink channel condition information and first pre-coding matrix of each scheduling user, calculating is obtained for every
The second pre-coding matrix of individual scheduling user；
The data of each scheduling user are carried out according to first pre-coding matrix and second pre-coding matrix pre-
Coding.
The data by after precoding, which are sent to each scheduling user, to be included：
The different transmission periods are set, are that each sub-array antenna specifies a transmission period；
Number after sending the precoding in the specified transmission period using the corresponding sub-array antenna of the scheduling user
According to.
A kind of base station, including：
Division module, for by antenna array partition at least one sub-array antenna；
Receiving module, the first upward signal for receiving user terminal UE transmissions；
Estimation module, the transmitting terminal correlation for estimating each sub-array antenna according to the first upward signal received
Parameter；
Wave beam forming module, for for each sub-array antenna, according to the transmitting terminal relevance parameter to descending ginseng
Examine signal and carry out wave beam forming, obtain the downlink reference signal after wave beam forming；And,
Sending module, it is described for the downlink reference signal after wave beam forming to be sent to by corresponding sub-array antenna
UE。
The receiving module is further used for：Receive the beam selection information of the UE feedbacks；
The base station further comprises：Scheduler module, for dispatching user according to the beam selection information received.
The scheduler module is used for：The sub-array antenna that the UE is selected is determined according to the beam selection information, according to
The sub-array antenna of homeostatic principle and UE selections is dispatched, the UE is grouped, obtained and each sub-array antenna pair
The one group of UE to be dispatched answered；Determined for every group of UE to be dispatched using the corresponding sub-array antenna transmission data of group UE to be dispatched
Scheduling user.
The sending module is further used for：Descending control signaling is sent to each scheduling user to use to trigger each scheduling
Family sends the second upward signal to the base station；
The receiving module is further used for：Receive the second upward signal that each scheduling user sends；
The base station further comprises：
Precoding module, for being prelisted based on the second upward signal received to the data of each scheduling user
Code；
The sending module is further used for：Data after precoding are sent to each scheduling user.
A kind of user terminal, including：
Sending module, for sending the first upward signal to base station, so that the base station is up according to receive first
Signal estimates the transmitting terminal relevance parameter of each sub-array antenna, for each sub-array antenna, according to the transmitting terminal phase
Closing property parameter carries out wave beam forming to downlink reference signal, and the downlink reference signal after wave beam forming is passed through into the sub-array antenna
It is sent to the user terminal；And,
Receiving module, for receiving the downlink reference signal after wave beam forming from the base station.
The user terminal further comprises：
Selecting module, for selecting wave beam, generation wave beam choosing according to the downlink reference signal after the wave beam forming received
Select information；
The sending module is further used for：To beam selection information described in the base station feedback, so that the base station root
User is dispatched according to the beam selection information.
As seen from the above technical solution, multi-antenna transmission method provided in an embodiment of the present invention, base station and user terminal, are fitted
For using AAS, user's dense distribution scene, for exist the scene of high spatial coherence provide one kind take into account performance with
The multi-antenna transmitting transmission scheme of complexity.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method for base station side progress multi-antenna transmission in one embodiment of the invention；
Fig. 2 a are the division schematic diagram of sub-array antenna in one embodiment of the invention；
Fig. 2 b are the division schematic diagram of sub-array antenna in another embodiment of the present invention；
Fig. 2 c are the division schematic diagram of sub-array antenna in another embodiment of the invention；
Fig. 3 is the division schematic diagram of sub-array antenna in another embodiment of the present invention；
Fig. 4 is the schematic flow sheet of the method for base station side progress multi-antenna transmission in another embodiment of the present invention；
Fig. 5 is the Signalling exchange schematic diagram of multi-antenna transmission method in one embodiment of the invention；
Fig. 6 is the schematic flow sheet of the method for progress multi-antenna transmission in UE sides in one embodiment of the invention；
Fig. 7 is the structural representation of base station in one embodiment of the invention；
Fig. 8 is the structural representation of base station in another embodiment of the present invention；
Fig. 9 is the structural representation of user terminal in one embodiment of the invention.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, develop simultaneously embodiment referring to the drawings, right
The present invention is further described.
Fig. 1 is the schematic flow sheet of multi-antenna transmission method in one embodiment of the invention, and this method is applied to base station.Such as
Shown in Fig. 1, comprise the following steps.
Step 101, by antenna array partition at least one sub-array antenna.
Dividing the method for sub-array antenna can have a variety of, including be evenly dividing according to the structure of aerial array or
It is non-homogeneous to divide.Or, according to the polarised direction of bay, the bay that will be provided with identical polarised direction is divided into one
Sub-array antenna.Or, the polarised direction with reference to bay is evenly dividing or non-homogeneous division to aerial array.Its
In, the number of the bay that each sub-array antenna is included can be with identical, can also be different.
By taking two-dimensional antenna array as an example, Fig. 2 a are the division schematic diagram of sub-array antenna in one embodiment of the invention.Its
In, aerial array 210 is divided evenly into 4 sub-array antennas 211,212,213 and 214, and each sub-array antenna is one
The square antenna battle array of rule, each self-contained 4 bays.
Fig. 2 b are the division schematic diagram of sub-array antenna in another embodiment of the present invention.Wherein, in the horizontal by antenna
Array 210 is evenly dividing into 4 sub-array antennas 221,222,223 and 224, and each sub-array antenna is a regular transverse direction
Stick antenna battle array, each self-contained 4 bays.
Fig. 2 c are the division schematic diagram of sub-array antenna in another embodiment of the invention.Wherein, in the vertical by antenna
Array 210 is evenly dividing into 4 sub-array antennas 231,232,233 and 234, and each sub-array antenna is a regular longitudinal direction
Stick antenna battle array, each self-contained 4 bays.
Fig. 3 is the division schematic diagram of sub-array antenna in another embodiment of the present invention.Wherein, in aerial array 300
Bay includes two kinds of polarization modes, respectively vertical polarization and horizontal polarization.According to both polarization modes by antenna array
Row 300 are divided into sub-array antenna 310 and 320, each self-contained 16 bays.Wherein, the antenna in sub-array antenna 310
Array element is that the bay in vertical polarization, sub-array antenna 320 is horizontal polarization.
More than divide sub-array antenna method it is merely illustrative, in specific application, can also by antenna array partition into
The sub-array antenna of bay comprising different numbers.For example, 16 bays that aerial array 210 is included are divided
Into the sub-array antenna for including 8,6 and 2 bays respectively.Wherein, the shape of sub-array antenna and included day
The number of linear array member will influence direction and the coverage of its wave beam formed.
Step 102, the first upward signal sent according to the user terminal (UE) received estimates each sub-array antenna
Transmitting terminal relevance parameter.
In this step, the first upward signal can be uplink reference signals, or other upward signals, such as upstream data
Or control signal.Transmitting terminal relevance parameter can be expressed as transmitting terminal correlation matrix.
By taking uplink reference signals as an example, the uplink reference signals that base station is sent according to UE estimate the hair of each sub-array antenna
Sending end correlation matrix, be specially：The transmitting terminal correlation matrix for obtaining whole aerial array is calculated according to uplink reference signals,
The transmitting terminal correlation matrix of equivalence is averagely obtained to all UE transmitting terminal correlation matrix, by the transmitting terminal of equal value
Submatrix in correlation matrix on diagonal is defined as the transmitting terminal correlation matrix of each sub-array antenna.
In one embodiment, the first upward signal is periodic Sounding Reference Signal (P-SRS), according to k-th
The up channel matrix that the P-SRS that user sends estimates k-th of user is Hk, it is assumed that total number of users is K, then transmission of equal value
Hold correlation matrixFor：
Wherein, []HRepresent conjugate transposition computing.
If whole aerial array is divided into L sub-array antenna, then above-mentioned transmitting terminal correlation matrix of equal value
It can be further represented as：
Wherein,The transmitting terminal correlation matrix of individual sub-array antenna is above-mentionedOn diagonalIndividual submatrixIf l-th of sub-array antenna includes n bay, thenFor n*n square matrix.
Step 103, for each sub-array antenna, wave beam is carried out to downlink reference signal according to transmitting terminal relevance parameter
Figuration, UE is sent to by the downlink reference signal (BRS) after wave beam forming by the sub-array antenna.
In this step, calculated according to transmitting terminal relevance parameter and obtain characteristic parameter, according to characteristic parameter to descending reference
Signal carries out wave beam forming, obtains BRS.Specifically, when transmitting terminal relevance parameter is transmitting terminal correlation matrix, feature
Parameter can be the characteristic vector corresponding with the eigenvalue of maximum of transmitting terminal correlation matrix, and/or, with transmitting terminal correlation
Time corresponding characteristic vector of big characteristic value of matrix.
For example, for each sub-array antennaIts corresponding transmitting terminal correlation matrixIt can pass through
Characteristic value and characteristic vector are uniquely represented, rightCarry out Eigenvalues Decomposition (EVD)：
Wherein, Σ is characterized value diagonal matrix, and Q is characterized vector matrix, []-1Represent inversion operation.WhenDuring full rank,
Σ=diag (λ1,λ2,...,λn) include n eigenvalue λ arranging from big to small1,λ2,...,λn, feature value vector Q={ χ1,
χ2,...,χnInclude corresponding n characteristic vector χ1,χ2,...,χn.Eigenvalue of maximum λ1Corresponding characteristic vector is χ1, it is secondary big
Eigenvalue λ2Corresponding characteristic vector is χ2。
The characteristic vector that wave beam forming is carried out to downlink reference signal can be one or more.For example,It is individual
Eigenvalue of maximum λ is used on sub-array antenna1Corresponding characteristic vector χ1To downlink reference signalWave beam forming is carried out, then
Obtaining BRS is
Or,Using time big eigenvalue λ on individual sub-array antenna2Corresponding characteristic vector χ2Descending reference is believed
NumberWave beam forming is carried out, then obtaining BRS is
Or, use the two characteristic vectors χ1And χ2To downlink reference signalWave beam forming is carried out, two are obtainedWithIt is sent respectively to UE.Or, obtain two BRS can also be superimposedThen the BRS after merging is sent to UE.
In specific application, it is contemplated that the compatibility of Long Term Evolution (LTE) system, downlink reference signal can be special for cell
Reference signal (CSI-RS) is indicated with reference signal (CRS) or channel status.
For the multiple BRS sent on L sub-array antenna, can by be time-multiplexed (TDM), frequency division multiplexing (FDM),
Code division multiplexing (CDM) or cyclic shift (CS) are multiplexed on running time-frequency resource.
In the embodiment shown in above-mentioned Fig. 1, by base station by antenna array partition at least one sub-array antenna, root
The transmitting terminal relevance parameter of each sub-array antenna is estimated according to the UE received the upward signals sent, for each antenna
Array, wave beam forming is carried out according to transmitting terminal relevance parameter to downlink reference signal, by BRS by being sent out on the sub-array antenna
UE is given, compared with whole aerial array is carried out into wave beam forming in the prior art, the complexity of calculating can be reduced, it is adaptable to
Using AAS, the scene of user's dense distribution, one kind is provided to there is the scene of high spatial coherence and takes into account performance and complexity
The multi-antenna transmitting transmission scheme of degree.
Fig. 4 is the schematic flow sheet of the method for base station side progress multi-antenna transmission in another embodiment of the present invention.Such as Fig. 4
Shown, on the basis of step described in Fig. 1, Fig. 4 further comprises：
Step 104, the beam selection information of UE feedbacks is received, and user is dispatched according to the beam selection information received.
In this step, beam selection information can be the corresponding wave beam marks of the selected BRS of UE, or, selected by UE
Sub-array antenna mark.Wherein, wave beam mark can be the index of wave beam, and sub-array antenna mark can be sub-array antenna
Index.
Specifically, UE receives the multiple BRS sent on L sub-array antenna of base station side, therefrom select one or
The multiple BRS of person, determine the corresponding beam index of selected BRS.If UE knows the sub-array antenna and ripple of base station side in advance
Corresponding relation between beam, then UE can determine the corresponding sub-array antenna of above-mentioned beam index according to the corresponding relation
Index, base station is sent to as beam selection information.If UE does not know the specifying information of the sub-array antenna of base station side, that
The corresponding beam index of selected BRS is sent to base station as beam selection information.
Base station determines the sub-array antenna that UE is selected according to the beam selection information received.If the beam selection information is
The corresponding beam index of the selected BRS of UE, base station can be mapped out by the corresponding relation between sub-array antenna and wave beam
The selected sub-array antennas of UE.If the beam selection information is UE selected sub-array antennas index, then base station can be with
Directly therefrom determine the selected sub-array antennas of UE.
The method of base station scheduling user includes：UE is grouped according to the UE determined the sub-array antennas selected, obtained
To one group to be dispatched UE corresponding with each sub-array antenna, then determined for every group of UE to be dispatched using group UE to be dispatched
Corresponding sub-array antenna transmits the scheduling user of data.Wherein, one group of UE to be dispatched includes one or more UE.
In one embodiment, it when carrying out user grouping, can be grouped fully according to the feedback of user, will feed back same
The UE of one sub-array antenna index is classified as one group of UE to be dispatched, and does not make any adjustments.For example, it is assumed that having K UE, for L day
Line subarray, UE 1 feeds back the index that the index of selected sub-array antenna feeds back selected sub-array antenna for 1, UE 2
For 1 and 2, UE 3 feeds back the rope that the index of selected sub-array antenna feeds back selected sub-array antenna for 1 and 3, UE 4
It is 1 to be cited as 1, UE 5 to feed back the index of selected sub-array antenna ..., and UE K feed back the index of selected sub-array antenna
For L.
So, base station can obtain result as shown in table 1.Wherein, it is 1 antenna submatrix to have 5 UE to have selected index
Row, this 5 UE are classified as one group.In view of concrete scene, as formed in the sub-array antenna within the coverage of wave beam
There is substantial amounts of user and wait scheduled, such as multiple users have a meeting in a meeting room at present, and these users are simultaneously to base
Determine that the selected sub-array antenna index of these users is all 1 in request data of standing service, base station.
Table 1 carries out UE packet examples for sub-array antenna
In another embodiment, base station can be grouped based on scheduling homeostatic principle to UE, i.e., to distributing to each day
The UE numbers to be dispatched of line subarray carry out balanced so that need to be dispatched the UE numbers in UE groups and be closer to.For example, such as table
Shown in 2, when the sub-array antenna index that most of UE feed back is 1, base station can be suitably between sub-array antenna to dividing
It is adjusted for same group of UE to be dispatched, such as considers to be adjusted between the close sub-array antenna of wave beam, and will choosing
The some UE for having selected multiple sub-array antennas are only remained in one group.With from the point of view of the Comparative result that is not made any adjustments in table 1, such as
Shown in table 2, UE 4 and UE 5 are distributed in manipulative indexing as in 2 and 3 UE dispatch respectively, and are 1 to treat in manipulative indexing
Dispatch and UE 3 is deleted in UE, only UE 3 is assigned in the UE to be dispatched that manipulative indexing is 3.
| The index of sub-array antenna | Corresponding one group of UE to be dispatched |
| 1 | UE 1、UE 2 |
| 2 | UE 2、UE 4 |
| 3 | UE 3、UE 5 |
| … | … |
| L | UE K |
Table 2 carries out UE packet examples for sub-array antenna
If UE will also connect except the index to the selected sub-array antenna of base station feedback on selected sub-array antenna
The BRS of receipts RSRP is sent to base station in the lump, and now base station can also be with reference on the selected sub-array antennas of each UE
RSRP carries out user grouping.For example, considering that only retaining RSRP in every group of UE to be dispatched is higher than in above-mentioned scheduling homeostatic principle
The UE of some threshold value, so that the UE numbers to be dispatched for distributing to each sub-array antenna are closer to.
For every group of UE to be dispatched, base station can therefrom determine that one or more scheduling are used according to default scheduling metrics
Family.Wherein, scheduling metrics can be UE geometric average handling capacity, Proportional Fair measurement or improved Proportional Fair
Measurement etc..
Step 105, send descending control signaling to each scheduling user and send the to base station to trigger each scheduling user
The data of each scheduling user are carried out precoding by two upward signals based on the second upward signal, and by the data after precoding
It is sent to each scheduling user.
In this step, the second upward signal can be uplink reference signals, such as aperiodic Sounding Reference Signal (A-
SRS).Transmitted descending control command carries the indicating bit for indicating that scheduling user sends uplink reference signals, so as to trigger
Dispatch user and send uplink reference signals to base station.Then, base station carries out channel estimation according to the uplink reference signals received,
And according to channel reciprocity (channel reciprocity) principle, estimate the downlink channel condition letter of whole aerial array
Breath.
In the application, due to by whole antenna array partition into multiple sub-array antennas, the channel between sub-array antenna
Spatial coherence it is weaker, therefore, it can use linear predictive coding algorithm between sub-array antenna, it is possible to obtain preferable
Performance.Meanwhile, nonlinear precoding algorithm is used inside sub-array antenna, to adapt to higher spatial coherence.I.e., respectively
Two pre-coding matrixes are calculated, precoding is carried out by the way of cascade.
Specifically, according to the downlink channel condition information of all scheduling users, calculated using linear pre-coding method
To Linear precoding matrix, as the first pre-coding matrix.Then, according to the downlink channel condition information and line estimated
Property pre-coding matrix, the nonlinear precoding matrix obtained for each scheduling user is calculated using nonlinear precoding method,
As the second pre-coding matrix.Then according to Linear precoding matrix and nonlinear precoding matrix to each scheduling user
Data carry out precoding.
For example, linear predictive coding can use ZF (ZF) or block diagonalization (BD) algorithm, according to all scheduling users
Downlink channel condition information, obtain Linear precoding matrix P.Then it is right for each scheduling user on sub-array antenna
Linear precoding matrix P and down channel matrix areProductNonlinear precoding is carried out, THP algorithms is such as used, obtains
To nonlinear precoding matrix vk.And then according to P and vkPrecoding twice is carried out to all user data, obtained after precoding
Data.
In one embodiment, in the data after sending precoding, it be able to will be prelisted simultaneously on whole aerial array
Data after code are sent to all scheduling users.In another embodiment, if one group scheduling of each sub-array antenna correspondence is used
Family, when including multiple scheduling users per group scheduling user, can set the different transmission periods, be that each sub-array antenna refers to
A fixed transmission period, then using the corresponding sub-array antenna of scheduling user after the specified transmission period sends precoding
Data, i.e., send to timesharing between sub-array antenna.
In the embodiment shown in fig. 4, base station receives the beam selection information of UE feedbacks, and is selected according to the wave beam received
Message scheduling user is selected, scheduling user is determined for each sub-array antenna so that the scheduling of correspondence different antennae subarray
Spatial coherence between user's group dies down, and only retains high space between the scheduling user of correspondence same antenna subarray
Correlation, and then cascade precoding is carried out using linear predictive coding and the united mode of nonlinear precoding, improve multi-user
The gain of multiplexing, increase cell is handled up.
Fig. 5 is the Signalling exchange schematic diagram of multi-antenna transmission method in one embodiment of the invention, including base station and waits to adjust
Spend user UE 1 ..., UE K.As shown in figure 5, comprising the following steps.
Step 501, base station by antenna array partition at least one sub-array antenna.
Step 502, each UE sends the first upward signal to base station.
For example, UE 1 ..., UE K send upward signal P-SRS to base station respectively.
Step 503, the first upward signal that base station is sent according to the UE received estimates the transmission of each sub-array antenna
Hold correlation matrix；For each sub-array antenna, characteristic vector is obtained according to transmitting terminal correlation matrix calculation, according to feature
Vector carries out wave beam forming to downlink reference signal, obtains BRS.
Step 504, corresponding BRS is sent to UE by base station on each sub-array antenna.
Step 505, UE selects sub-array antenna according to the BRS received.
Step 506, UE is to base station feedback beam selection information.
Step 507, user is dispatched in base station according to the beam selection information received.
Step 508, base station sends descending control signaling to each scheduling user and sent out with triggering each scheduling user to base station
Send the second upward signal.
As shown in fig. 5, it is assumed that UE 1 and UE K is scheduling user, now base station triggers UE 1 and UE K sends A- to base station
SRS。
Step 509, each scheduling user sends the second upward signal to base station.
Step 510, base station is prelisted based on the second upward signal received to the data progress cascade of each scheduling user
Code.
Step 511, the data after precoding are sent to each scheduling user by base station.
In one embodiment, except sending the data after precoding, base station can also send to scheduling user and demodulate simultaneously
The related signal deployment information of reference signal (DMRS), for the correlation demodulation of UE data channel.
Step 512, each scheduling user detects to the downlink data received, therefrom obtains the data of itself.
Fig. 6 is the schematic flow sheet of the method for progress multi-antenna transmission in UE sides in one embodiment of the invention.Such as Fig. 6 institutes
Show, comprise the following steps.
Step 601, the first upward signal is sent to base station, so that base station estimates every according to the first upward signal received
The transmitting terminal relevance parameter of individual sub-array antenna, for each sub-array antenna, according to transmitting terminal relevance parameter to descending
Reference signal carries out wave beam forming, and the downlink reference signal BRS after wave beam forming is sent into user by the sub-array antenna
Terminal.
For example, the first upward signal is P-SRS.
Step 602, BRS is received from base station, wave beam is selected according to the BRS received, and generate beam selection information.
In one embodiment, UE receives the BRS sent on L sub-array antenna of base station side, estimates each BRS ginseng
Signal reception power (RSRP) is examined, one or more BRS is therefrom selected, for example, maximum selection RSRP BRS, Huo Zhexuan
Select the maximum and secondary big BRS of RSRP.Resources of the UE according to shared by the BRS of selection can determine the corresponding wave beams of these BRS.
Further, UE can be generated according to whether know the corresponding relation between the sub-array antenna of base station side and wave beam
Different beam selection informations.If specifically, UE can not know above-mentioned corresponding relation, by the corresponding wave beams of selected BRS
Mark feeds back to base station as beam selection information., can be according to above-mentioned corresponding relation if UE knows above-mentioned corresponding relation in advance
Sub-array antenna mark is gone out by wave beam identity map, base station is fed back to as beam selection information.
In another embodiment, UE, can also be by selected BRS RSRP except to base station feedback beam selection information
Base station is sent in the lump, so that the RSRP that base station may be referred to the selected BRS of UE carries out user's scheduling.
Step 603, to base station feedback beam selection information, used so that base station is dispatched according to the beam selection information received
Family.
When the UE is scheduling user, step 604 and 605 is further performed.
Step 604, descending control signaling is received from base station, and the second upward signal is sent to base station, so that base station is based on
Second upward signal carries out precoding to the data of each scheduling user, and the data after precoding are sent into each scheduling use
Family.
Step 605, the data after precoding are received from base station, and carries out Data Detection.
Fig. 7 is the structural representation of base station 700 in one embodiment of the invention.As shown in fig. 7, base station 700 includes：
Division module 710, for by antenna array partition at least one sub-array antenna；
Receiving module 720, the first upward signal for receiving user terminal UE transmissions；
Estimation module 730, the first upward signal for being received according to receiving module 720 estimates 710 strokes of division module
The transmitting terminal relevance parameter of each sub-array antenna separated；
Wave beam forming module 740, for for each sub-array antenna, the transmitting terminal estimated according to estimation module 730
Relevance parameter carries out wave beam forming to downlink reference signal, obtains the downlink reference signal after wave beam forming；And,
Sending module 750, phase is passed through for the downlink reference signal after the wave beam forming that obtains wave beam forming module 740
The sub-array antenna answered is sent to UE.
Fig. 8 is the structural representation of base station 800 in another embodiment of the present invention.On the basis of module shown in Fig. 7,
Base station 800 further comprises scheduler module 760 and precoding module 770.
In one embodiment, receiving module 720 is further used for：Receive the beam selection information of UE feedbacks.Correspondingly, adjust
Module 760 is spent, the beam selection information for being received according to receiving module 720 dispatches user.
In one embodiment, scheduler module 760 is used for：The sub-array antenna that UE is selected is determined according to beam selection information,
The sub-array antenna selected according to scheduling homeostatic principle and UE, UE is grouped, obtains corresponding with each sub-array antenna
One group of UE to be dispatched；The tune that data are transmitted using the corresponding sub-array antennas of group UE to be dispatched is determined for every group of UE to be dispatched
Spend user.
In one embodiment, sending module 750 is further used for：The each scheduling user hair determined to scheduler module 760
Send descending control signaling and send the second upward signal to base station to trigger each scheduling user.Receiving module 720 is further used for：
Receive the second upward signal that each scheduling user sends.
Correspondingly, precoding module 770, for the second upward signal for being received based on receiving module 720 to scheduling mould
The data for each scheduling user that block 760 is determined carry out precoding.Sending module 750 is further used for：By precoding module 770
Data after obtained precoding are sent to each scheduling user.
Fig. 9 is the structural representation of user terminal 900 in one embodiment of the invention.As shown in figure 9, user terminal 900
Including：
Sending module 910, for sending the first upward signal to base station, so that base station is according to the receive first up letter
The transmitting terminal relevance parameter of number each sub-array antenna of estimation, for each sub-array antenna, joins according to transmitting terminal correlation
It is several that wave beam forming is carried out to downlink reference signal, the downlink reference signal after wave beam forming is sent to by the sub-array antenna
User terminal；And,
Receiving module 920, for receiving the downlink reference signal after wave beam forming from base station.
In one embodiment, user terminal 900 further comprises：
Selecting module 930, ripple is selected for the downlink reference signal after the wave beam forming that is received according to receiving module 920
Beam, generates beam selection information.
Correspondingly, sending module 910 is further used for：The beam selection information determined to base station feedback selecting module 930,
So that user is dispatched in base station according to beam selection information.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (14)
1. a kind of multi-antenna transmission method, it is characterised in that applied to base station, methods described includes：
By antenna array partition at least one sub-array antenna；
The first upward signal sent according to the user terminal UE received estimates the transmitting terminal correlation of each sub-array antenna
Parameter；And,
For each sub-array antenna, wave beam forming is carried out to downlink reference signal according to the transmitting terminal relevance parameter, will
Downlink reference signal after wave beam forming is sent to the UE by the sub-array antenna.
2. according to the method described in claim 1, it is characterised in that it is described according to the transmitting terminal relevance parameter to descending ginseng
Examining signal progress wave beam forming includes：
Calculated according to the transmitting terminal relevance parameter and obtain characteristic parameter, the descending reference is believed according to the characteristic parameter
Number carry out wave beam forming.
3. method according to claim 2, it is characterised in that the transmitting terminal relevance parameter is transmitting terminal correlation square
Battle array, the characteristic parameter is the characteristic vector corresponding with the eigenvalue of maximum of the transmitting terminal correlation matrix, and/or, with
Time corresponding characteristic vector of big characteristic value of the transmitting terminal correlation matrix.
4. according to the method described in claim 1, it is characterised in that further comprise：
The beam selection information of the UE feedbacks is received, and user is dispatched according to the beam selection information received.
5. method according to claim 4, it is characterised in that the beam selection information scheduling user that the basis is received
Including：
The sub-array antenna that the UE is selected is determined according to the beam selection information；
The sub-array antenna selected according to scheduling homeostatic principle and the UE, the UE is grouped, obtained and each antenna
The corresponding one group of UE to be dispatched of subarray；
The scheduling user that data are transmitted using the corresponding sub-array antennas of group UE to be dispatched is determined for every group of UE to be dispatched.
6. the method according to claim 4 or 5, it is characterised in that further comprise：
Descending control signaling, which is sent, to each scheduling user sends the second up letter to the base station to trigger each scheduling user
Number；
Precoding is carried out to the data of each scheduling user based on second upward signal, and the data after precoding are sent
To each scheduling user.
7. method according to claim 6, it is characterised in that described to be used based on second upward signal each scheduling
The data at family, which carry out precoding, to be included：
The downlink channel condition information of each scheduling user is estimated according to second upward signal；
According to the downlink channel condition information of all scheduling users, calculating obtains the first pre-coding matrix；
According to the downlink channel condition information and first pre-coding matrix of each scheduling user, calculating is obtained for each tune
Spend the second pre-coding matrix of user；
Precoding is carried out to the data of each scheduling user according to first pre-coding matrix and second pre-coding matrix.
8. method according to claim 6, it is characterised in that the data by after precoding are sent to each scheduling and used
Family includes：
The different transmission periods are set, are that each sub-array antenna specifies a transmission period；
Data after sending the precoding in the specified transmission period using the corresponding sub-array antenna of the scheduling user.
9. a kind of base station, it is characterised in that including：
Division module, for by antenna array partition at least one sub-array antenna；
Receiving module, the first upward signal for receiving user terminal UE transmissions；
Estimation module, the transmitting terminal correlation ginseng for estimating each sub-array antenna according to the first upward signal received
Number；
Wave beam forming module, for for each sub-array antenna, being believed according to the transmitting terminal relevance parameter descending reference
Number carry out wave beam forming, obtain the downlink reference signal after wave beam forming；And,
Sending module, for the downlink reference signal after wave beam forming to be sent into the UE by corresponding sub-array antenna.
10. base station according to claim 9, it is characterised in that the receiving module is further used for：Receive the UE anti-
The beam selection information of feedback；
The base station further comprises：
Scheduler module, for dispatching user according to the beam selection information received.
11. base station according to claim 10, it is characterised in that the scheduler module is used for：According to the beam selection
Information determines the sub-array antenna of the UE selections, the sub-array antenna selected according to scheduling homeostatic principle and the UE, by institute
State UE to be grouped, obtain one group to be dispatched UE corresponding with each sub-array antenna；Use is determined for every group of UE to be dispatched
The corresponding sub-array antennas of group UE to be dispatched transmit the scheduling user of data.
12. the base station according to claim 10 or 11, it is characterised in that the sending module is further used for：To every
Individual scheduling user sends descending control signaling and sends the second upward signal to the base station to trigger each scheduling user；
The receiving module is further used for：Receive the second upward signal that each scheduling user sends；
The base station further comprises：
Precoding module, for carrying out precoding to the data of each scheduling user based on the second upward signal received；
The sending module is further used for：Data after precoding are sent to each scheduling user.
13. a kind of user terminal, it is characterised in that including：
Sending module, for sending the first upward signal to base station, so that the base station is according to the first upward signal received
The transmitting terminal relevance parameter of each sub-array antenna is estimated, for each sub-array antenna, according to the transmitting terminal correlation
Parameter carries out wave beam forming to downlink reference signal, and the downlink reference signal after wave beam forming is sent by the sub-array antenna
To the user terminal；And,
Receiving module, for receiving the downlink reference signal after wave beam forming from the base station.
14. user terminal according to claim 13, it is characterised in that further comprise：
Selecting module, for selecting wave beam, generation beam selection letter according to the downlink reference signal after the wave beam forming received
Breath；
The sending module is further used for：To beam selection information described in the base station feedback, so that the base station is according to institute
State beam selection information scheduling user.
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| CN201610040786.9A CN106992805A (en) | 2016-01-21 | 2016-01-21 | Multi-antenna transmission method, base station and user terminal |
| PCT/CN2017/071025 WO2017124967A1 (en) | 2016-01-21 | 2017-01-13 | Multi-antenna transmission method, base station, and user terminal |
| JP2018538148A JP6961599B2 (en) | 2016-01-21 | 2017-01-13 | Multi-antenna transmission method, base station, and user terminal |
| CN201780006068.2A CN108604916B (en) | 2016-01-21 | 2017-01-13 | Multi-antenna transmission method, base station and user terminal |
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| CN201610040786.9A CN106992805A (en) | 2016-01-21 | 2016-01-21 | Multi-antenna transmission method, base station and user terminal |
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| WO2019101152A1 (en) * | 2017-11-24 | 2019-05-31 | 上海诺基亚贝尔股份有限公司 | Method and device for performing precoding |
| WO2019140610A1 (en) * | 2018-01-18 | 2019-07-25 | Nokia Shanghai Bell Co., Ltd. | Apparatuses and methods for non-linear precoding |
| CN110838862A (en) * | 2018-08-17 | 2020-02-25 | 电信科学技术研究院有限公司 | Beam processing method, device, terminal and network side equipment |
| WO2020098268A1 (en) * | 2018-11-12 | 2020-05-22 | 中兴通讯股份有限公司 | Control method and system for antenna array |
| CN113315555A (en) * | 2020-02-27 | 2021-08-27 | 华为技术有限公司 | Beam forming method and related device |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1941663B (en) * | 2005-09-30 | 2011-11-30 | 上海原动力通信科技有限公司 | Multi-antenna channel duplicating method and wavebeam shaping method |
| CN101359947B (en) * | 2007-07-30 | 2017-07-21 | 电信科学技术研究院 | The broadcast wave bean shaping method and device of multi-antenna array system |
| JP5478525B2 (en) * | 2011-01-31 | 2014-04-23 | 日本電信電話株式会社 | Transmission method and transmission apparatus |
| KR102109655B1 (en) * | 2012-02-23 | 2020-05-12 | 한국전자통신연구원 | Method for multi-input multi-output communication in a large-scale antenna system |
| JP6073073B2 (en) * | 2012-05-10 | 2017-02-01 | シャープ株式会社 | Terminal apparatus, base station apparatus, and communication method |
| CN104039017A (en) * | 2013-03-06 | 2014-09-10 | 夏普株式会社 | Method for transmitting scheduling information and base station |
| EP2995014B1 (en) * | 2013-05-10 | 2018-09-19 | Samsung Electronics Co., Ltd. | Apparatus and method for selecting transmit and receive beam in a wireless communication system |
| US9450723B2 (en) * | 2013-11-01 | 2016-09-20 | Samsung Electronics Co., Ltd. | Channel estimation for data transmission parameter determination in systems employing an array-of-subarrays transceiver architecture |
-
2016
- 2016-01-21 CN CN201610040786.9A patent/CN106992805A/en active Pending
-
2017
- 2017-01-13 JP JP2018538148A patent/JP6961599B2/en active Active
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Also Published As
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| JP6961599B2 (en) | 2021-11-05 |
| CN108604916A (en) | 2018-09-28 |
| JP2019508941A (en) | 2019-03-28 |
| WO2017124967A1 (en) | 2017-07-27 |
| CN108604916B (en) | 2021-07-30 |
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