WO2014086045A1

WO2014086045A1 - Coordinated transmission method, device, and system

Info

Publication number: WO2014086045A1
Application number: PCT/CN2012/086210
Authority: WO
Inventors: 李小捷; 李琦; 熊雄
Original assignee: 华为技术有限公司
Priority date: 2012-12-07
Filing date: 2012-12-07
Publication date: 2014-06-12
Also published as: CN103988446A; CN103988446B

Abstract

The present invention relates to the field of communications. Embodiments of the present invention provide a coordinated transmission method, device, and system, to raise the probability of receiving signals of consistent phases on a user side. The method comprises: a base station obtaining a beam forming (BF) compensation parameter; the base station performing compensation on an initial BF weight value according to the BF compensation parameter, to obtain a first BF weight value; the base station performing channel phase compensation on the first BF weight value according to a channel phase difference and the first BF weight value, the channel phase difference being a parameter used for performing channel phase compensation on the first BF weight value; and the base station sending data information to a user equipment (UE) according to the first BF weight value after the channel phase compensation. The present invention is suitable for sending data to a UE through coordination between base stations.

Description

Method, device and system for cooperative transmission

The present invention relates to the field of communications, and in particular, to a method, apparatus, and system for cooperative transmission. Background technique

At present, collaborative transmission methods are widely used in the industry. Among them, COMP (Coordinated Multiple Points) is a cooperative transmission mode. The interference signal of the neighboring cell is transformed into a useful signal for the edge user of the cell by using the COP technology, and the edge user of the cell is served, thereby reducing the neighbor. The interference of the cell to the users at the edge of the cell improves the SINR (Signal to Interference plus Noise Ratio) of the user and enhances the quality of the received signal of the user. The following is an example in which two base stations eNB1 and eNB2 cooperate to serve one UE as an example.

The estimation matrix of the downlink channel acquired by the base station eNB1 is: = ^; The estimation matrix of the downlink channel acquired by the base station eNB2 is: H _D ² _L = bcO ^T . Wherein, an estimation matrix indicating an uplink channel of the base station eNB1, an estimation matrix indicating an uplink channel of the base station eNB2, and a and b represent hf ^m h

― J brain. ―

The relative difference between the receiving and receiving channels of eNB1 and eNB2 is: ^η , ^ , indicating the jth transmitting channel response of the base station eNB1, indicating the jth receiving channel response of the base station eNB1, indicating the jth transmitting channel response of the base station eNB2, indicating the base station The jth receiving channel response of eNB2, c indicates the UE

h ^m .

― = c

The relative difference between the transceiver channels: ' , represents the jth channel response of the base station UE, and represents the jth channel response of the base station UE. It is assumed that the BF weights calculated by the eNB1 and the eNB2 according to the uplink channel are ^w i and ^, where s is the signal to be transmitted, and the signals received and combined by the UE are: y = H _D ^l _L w _lS + H _D ² _L w _lS

= c{a(Hl _K fw _l +b(H _U ² _L ) ^T w ₂ }s Since the phases of ^ and ^ are unknown, the effect of the superposition of the two signals is also unknown. Only when the phases of the two signals are the same, the signal superposition can obtain the maximum gain; when the phases of the two signals are inconsistent, the effect of signal superposition is not optimal, especially when the two phases are inverted, the signal cancellation occurs, so The last combined signal on the UE side may not be optimal.

SUMMARY OF THE INVENTION Embodiments of the present invention provide a method, apparatus, and system for cooperative transmission, which are used to improve the possibility of receiving a phase-consistent signal on the user side, and enhance the quality of the received information of the user. In order to achieve the above object, embodiments of the present invention use the following technical solutions:

In a first aspect, an embodiment of the present invention provides a method for cooperative transmission, including: acquiring, by a base station, a compensation parameter of a beamforming BF; the base station compensating for an original BF weight according to the compensation parameter of the BF, to obtain a first BF weight; the base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight; the channel phase difference is used to perform the first BF weight The parameter of the channel phase compensation; the base station sends the data information to the user equipment UE according to the first BF weight value after the channel phase compensation.

In a first possible implementation manner of the first aspect, the determining, by the base station, the compensation parameter of the beamforming BF comprises: acquiring, by the base station, an original BF weight and an estimation matrix of an uplink channel; The estimated matrix and the original BF weights are obtained for the BF compensation parameters.

With reference to the first aspect, in a second possible implementation manner, the acquiring, by the base station, the compensation parameter of the beamforming BF comprises: receiving, by the base station, a compensation parameter of the BF sent by the processing device that is cooperatively transmitted.

With reference to the first aspect or the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner, the base station according to the channel phase difference Before performing channel phase compensation on the first BF weight, the method further includes: the base station acquiring a channel phase difference.

With reference to the third possible implementation manner of the foregoing aspect, in a fourth possible implementation, the acquiring, by the base station, the channel phase difference includes: if the base station is not the first reference base station, the base station acquires a channel phase difference between the base station and the first reference base station; wherein the first reference base station is a reference base station when the base station performs channel phase compensation.

In combination with the third possible implementation of the first aspect, in a fifth possible implementation The acquiring, by the base station, the channel phase difference includes: if the base station is the first reference base station, the base station acquires a channel phase difference between the base station and the first base station to be 0, where the base station A reference base station when channel phase compensation is performed for the first base station.

In a second aspect, the embodiment of the present invention provides a method for cooperative transmission, including: determining a first reference base station and a first base station; determining a channel phase difference of the first reference base station and a channel phase difference of the first base station; Transmitting a channel phase difference of the first reference base station to the first base station; and transmitting a channel phase difference of the first base station to the first base station, so that the first base station and the base station The first base station performs channel phase compensation on the first BF weight according to the channel phase difference; wherein, the first BF weight refers to the BF weight after the original BF weight is compensated according to the compensation parameter of the BF .

In a first possible implementation manner of the second aspect, the determining a channel phase difference of the first reference base station and a channel phase difference of the first base station includes: determining the first reference base station A channel phase difference between a reference base station and the first base station is 0; and determining, according to a preset algorithm, a phase difference of at least one preset channel between the first reference base station and the first base station of the first base station.

With reference to the first possible implementation manner of the second aspect, in the second possible implementation, the sending, by the first base station, the channel phase difference to the first base station includes: performing the according to a preset algorithm Determining, by the determined first at least one preset channel between the first base station and the first base station, the phase difference is sent to the first base station.

With reference to the second aspect, or the first possible implementation manner of the second aspect, or the second possible implementation manner of the second aspect, in a third possible implementation manner, the method further includes: determining, by the second reference base station, And acquiring, by the second base station, an estimation matrix and an original BF weight of the uplink channel of the second base station and the second base station; acquiring, according to an estimation matrix of the uplink channel of the second base station and the second base station, and an original BF weight a compensation parameter of a beam assignment BF of the second base station and the second base station; transmitting the acquired compensation parameter of the BF of the second base station to the second reference base station; and the second The compensation parameter of the BF of the base station is sent to the second base station, so that the second reference base station and the second base station compensate the original BF weight according to the compensation parameter of the BF, to obtain the first BF right. value.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation, the obtaining, according to an estimation matrix of an uplink channel of the second base station and the second base station, and an original BF weight, acquiring Complementing the beam assignment BF of the second reference base station and the second base station The compensation parameter includes: 0 as the compensation parameter of the BF of the second reference base station; and according to the formula: fi _k - angle ((H _U ^k _L ) ^T w _k Y ((H§ _L f

A = 0 k = g acquires a compensation parameter of the beam assignment BF of the second base station, where angle represents the phase, g represents the second reference base station, and ^ represents the original BF weight of the second reference base station g, H ^ denotes an estimation matrix of the uplink channel of the second base station k, H^ denotes an estimation matrix of the uplink channel of the second reference base station g, T denotes a transposition of the matrix, and Η denotes a conjugate transpose of the matrix.

In a third aspect, an embodiment of the present invention provides a base station, including: an acquiring unit, configured to acquire a compensation parameter of a beamforming BF; a compensation unit, configured to acquire, according to the compensation parameter of the BF obtained by the acquiring unit, an original The BF weight is compensated to obtain a first BF weight; the compensation unit is further configured to perform channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight; the channel The phase difference is a parameter for performing channel phase compensation on the first BF weight; the sending unit is configured to send data information to the user equipment UE according to the weight of the first BF after the channel phase compensation obtained by the compensation unit.

In a first possible implementation manner of the third aspect, the acquiring unit is specifically configured to: obtain an original BF weight and an estimation matrix of an uplink channel; and according to the estimation matrix of the uplink channel and the original BF weight , Get the compensation parameters of BF.

With reference to the third aspect, in a second possible implementation, the acquiring unit is specifically configured to: receive a compensation parameter of the BF sent by the processing device that is cooperatively transmitted.

With reference to the third aspect, or the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, in the third possible implementation manner, the acquiring unit is further used Obtain the channel phase difference.

With the third possible implementation of the third aspect, in a fourth possible implementation, the acquiring unit is specifically configured to acquire, when the base station is not the first reference base station, the first reference The channel phase difference between the base stations; wherein the first reference base station is a reference base station when the base station performs channel phase compensation.

With reference to the third possible implementation manner of the third aspect, in a fifth possible implementation, the acquiring unit is specifically configured to: when the base station is a first reference base station, acquire the base station and The channel phase difference between the first base stations is 0, where the base station is a reference base station when the first base station performs channel phase compensation. In a fourth aspect, the embodiment of the present invention provides a processing device for cooperative transmission, including: a determining unit, configured to determine a first reference base station and a first base station; and the determining unit is further configured to determine the first reference base station a channel phase difference and a channel phase difference of the first base station; a transmitting unit, configured to send, by the determining unit, a channel phase difference of the first reference base station to the first reference base station; The channel phase difference of the first base station is sent to the first base station, so that the first reference base station and the first base station perform channel phase compensation on the first BF weight according to the channel phase difference; The first BF weight refers to the BF weight after the original BF weight is compensated according to the compensation parameter of BF.

In a first possible implementation manner of the fourth aspect, the determining unit is specifically configured to: determine that a channel phase difference between the first reference base station and the first base station of the first reference base station is 0; Determining, by the preset algorithm, a phase difference of at least one preset channel between the first reference base station and the first base station of the first base station.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation, the sending unit is specifically configured to: use the first base station that is determined according to a preset algorithm The at least one preset channel between the reference base station and the first base station is out of phase, and the periodic polling is sent to the first base station.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the determining unit is further configured to determine a second base station, and a second base station; the processing device, further comprising: an acquiring unit, configured to acquire an estimation matrix and an original BF weight of an uplink channel of the second reference base station and the second base station; And acquiring, by the estimation matrix of the uplink channel of the second base station and the second base station, and the original BF weight, acquiring compensation parameters of the beam assignment BF of the second reference base station and the second base station; a unit, configured to send, to the second reference base station, a compensation parameter of the BF of the second reference base station acquired by the acquiring unit, and send a compensation parameter of the BF of the second base station to the second And the base station, so that the second reference base station and the second base station compensate the original BF weight according to the compensation parameter of the BF, to obtain the first BF weight.

With reference to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the acquiring unit is specifically configured to use 0 as the fi _k - angle of the second reference base station ( (H _U ^k _L ) ^T w _k Y ((H§ _L f

BF compensation parameter; and according to the formula: A = 0 = g a compensation parameter of the beam assignment BF of the second base station, where angle represents the phase, g represents the second reference base station, ^ represents the original BF weight of the second reference base station g, and H^ represents the second base station k The estimation matrix of the uplink channel, H^ represents the estimation matrix of the uplink channel of the second reference base station g, T represents the transposition of the matrix, and Η represents the conjugate transpose of the matrix.

In a fifth aspect, an embodiment of the present invention provides a system for cooperative transmission, including: at least two base stations, a user equipment UE, and a processing device for cooperative transmission; wherein the base station provides a collaboration for the foregoing embodiment of the present invention. The method, device and system for transmitting, by obtaining the compensation parameter of BF, compensate the original BF weight to obtain the first BF weight. Channel phase compensation is performed on the first BF weight according to the channel phase difference and the first BF weight, and the data information is transmitted to the UE by using the first BF weight of the channel phase compensation. In this way, before the base station side transmits the data, the BF weight is compensated, thereby reducing the possibility that the signal phases of the at least two base stations that simultaneously transmit the data information to the UE are inconsistent, and at least simultaneously transmitting the data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic diagram of a method for cooperative transmission according to an embodiment of the present invention; FIG. 2 is a schematic diagram of another method for cooperative transmission according to an embodiment of the present invention; FIG. 3 is another collaboration provided by an embodiment of the present invention. FIG. 4 is a schematic functional block diagram of a base station according to an embodiment of the present invention;

5 is a functional block diagram of another base station according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 7 is a functional block diagram of a processing device for cooperative transmission according to an embodiment of the present invention; Intention

FIG. 8 is a schematic functional block diagram of another processing device for cooperative transmission according to an embodiment of the present disclosure;

FIG. 9 is a functional block diagram of another processing device for cooperative transmission according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a processing device for cooperative transmission according to an embodiment of the present invention; FIG. 11 is a schematic diagram of a system for cooperative transmission according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. An embodiment of the present invention provides a method for cooperative transmission, as shown in FIG. 1 , including:

101. The base station acquires a compensation parameter of BF (beam forming).

Specifically, the base station obtains the compensation parameter of the BF in two ways. One is that the base station obtains the compensation parameter of the BF by itself, and the other is that the base station acquires the compensation parameter of the BF through the cooperatively transmitted processing device.

In the case that the base station obtains the compensation parameter of the BF, the specific process of the base station acquiring the compensation parameter of the BF is: the base station acquires the original BF weight and the estimation matrix of the uplink channel. The base station acquires a compensation parameter of the BF according to the estimation matrix of the uplink channel and the original BF weight.

It should be noted that the original BF weight is the BF weight without any compensation.

Specifically, the base station may obtain an estimation matrix of the uplink channel by using channel estimation. The base station can obtain the original BF value through the estimation matrix of the uplink signal. The following is an example of obtaining the original BF value based on the estimation matrix of the uplink signal in the TDD (Time Division Duplexing) system. The specific process is as follows: In the TDD (Time Division Duplexing) system, due to the uplink and downlink The link uses the same frequency, so the eNB (Evolved NodeB, Enhanced Base Station) and UE (User Equipment, User Equipment) The spatial channels between the antennas can be considered to be the same. The spatial channel is represented by a matrix. It is assumed that the RRU (Remote Radio Unit) of the eNB has m transceiver units, wherein the i-th transmission channel response is /^, and the i-th reception channel response is '. The UE has "TRX, where the first channel response is

.UE

The response of the first receiving channel is ". The estimation matrix for the uplink channel used by the eNB to receive information transmitted by the UE is:

The UE is a diagonal matrix formed by the receiving channel response of the eNB, and is a diagonal matrix formed by the UE's transmitting channel response. The estimation matrix for the downlink channel used by the UE to receive the information transmitted by the eNB is:

■ hl ^E (H \ ^T K ^m where is the diagonal matrix formed by the eNB's transmit channel response, which is the diagonal matrix formed by the UE's receive channel response. T represents the transpose of the matrix. In order to be able to pass the uplink channel on the eNB side Measurement to obtain downlink channel information, Perform RRU channel calibration on the eNB side.

eNB eNB

■ a

The same amplitude phase difference, that is to say, . Where is the unit matrix of size m and a is a fixed value. The eNB side can obtain the downlink channel through the uplink channel, and the specific process is as follows:

= ^cI n ( ^H U _L ) ^aI m = ^aC ( ^H U _L ) where the UE's transceiver channel response also maintains the same amplitude phase difference, ie

UE

K

UE ■ c *I„, l _n is an identity matrix of size n, and c is a fixed value. Thus, the base station can directly calculate the original BF weight according to the base. It should be noted that the base station also uses other methods to obtain the original BF weight. For example, the BF weight is obtained according to the covariance of the uplink channel at the previous moment and the estimation matrix of the uplink channel at the current moment. The present invention does not limit this. After the base station obtains the original BF weight, it is estimated according to the uplink channel. The matrix and the original BF weight obtain the compensation parameter of the BF. Specifically, the base station obtains the compensation parameter of the BF according to the formula: ^ -^g^^^^)) ⁷ ^ ), wherein the angle represents Take the phase, T denotes the transpose of the matrix, denotes the matrix of the uplink channel of the base station k, ( ^: , ^x ) denotes the Xth column element of the matrix, k denotes the first base station, k=l, 2, ... .. K, K represents the number of base stations transmitting data information to the UE, and A represents

BF compensation parameters. It should be noted that X in the Xth column element of the matrix may be an antenna fixed to the UE, or may be an antenna of all antennas of the polled UE, or may be obtained according to x, where Take the sum of the squares of all the elements of H:

It is also possible to obtain X according to other methods, and the present invention does not limit this.

102. The base station compensates the original BF weight according to the compensation parameter of the BF, to obtain a first BF weight. Specifically, after acquiring the compensation parameter of the BF, the base station compensates the original BF weight according to the formula=V^ to obtain the first BF weight. Wherein, represents the weight of the first BF of the base station k; ^ represents the weight of the original BF of the base station k; k represents the first base station, k = 1, 2, ..., K; K represents the The number of base stations in which the UE transmits data information; _e represents the BF phase compensation parameter of the base station k, j represents an imaginary unit, and A represents a compensation parameter of the BF.

103. The base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight.

The channel phase difference is a parameter for performing channel phase compensation on the first BF weight.

Specifically, after acquiring the first BF weight, the base station performs channel phase compensation on the first BF weight according to the formula: =^. Where k is the first base station, k=l, 2, ..., Κ, K represents the number of base stations transmitting data information to the UE; and indicates that the base station k performs channel phase compensation first. BF weight; ^ denotes the first BF weight of the base station k; e ^1⁄2 denotes the channel phase compensation parameter of the base station k, j denotes an imaginary unit, ^ denotes the channel phase difference of the base station k, the ^ is pre-acquired, and ^ e [0, 2 r].

If the base station is the first reference base station, if the base station acquires ^ is 0, the base station performs channel phase compensation on the first BF weight according to the formula = i^e^, and obtains channel phase compensation. The subsequent first BF weight is: That is, for the first reference base station, the first BF weight does not require channel phase compensation.

The first reference base station is a reference base station when the first base station performs channel phase compensation. If the base station is not the first base station, that is, the base station is the first base station, and the base station acquires ^ is not 0, then the first BF weight obtained by the base station after channel phase compensation is: =i gas

104. The base station sends data information to the user equipment UE according to the first BF weight value after the channel phase compensation.

Specifically, the base station performs data on the data by using the weight of the first BF after channel phase compensation. Weighted and sent to the UE.

Further, the base station according to the formula; = ii> _gi s ,

, k gi data sent to the UE. Where k represents the first few base stations, k=l, 2, ..., K. Κ indicates the number of base stations that transmit data information to the UE. _gl represents a first reference base station, the base station T _k represents transmitted data weighting, s k indicates the base station needs to send data to the UE, and BF denotes a first weight value of a first reference base station, a representation of the channel phase compensation for base station k After the weight of the first BF. That is to say, when the base station is the first base station, the weighting data is transmitted to the UE according to the formula; When the base station is not the first reference base station, the weighted data is transmitted to the UE according to Equation 7 = ^^. An embodiment of the present invention provides a method for cooperative transmission. By acquiring a compensation parameter of BF, the original BF weight is compensated to obtain a first BF weight. Channel phase compensation is performed on the first BF weight according to the channel phase difference and the first BF weight, and the data information is transmitted to the UE by using the first BF weight of the channel phase compensation. In this way, before the data is transmitted by the base station, the BF weight is compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously transmit data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user. An embodiment of the present invention provides a method for cooperative transmission, as shown in FIG. 2, including:

201. Determine a first reference base station and a first base station. Specifically, the processing device of the coordinated transmission determines one first reference base station among the at least two base stations that need to perform channel phase compensation, and determines other base stations as the first base station. It should be noted that the processing device of the coordinated transmission may determine a first reference base station in at least two base stations that need to perform channel phase compensation according to a preset algorithm, and may select any one of at least two base stations that need channel phase compensation. A base station determines that it is the first base station, and the present invention does not limit this.

202. Determine a channel phase difference of the first reference base station and a channel phase difference of the first base station.

Specifically, the processing device of the coordinated transmission determines that the channel phase difference between the first reference base station and the first base station of the first reference base station is 0. The processing device of the coordinated transmission determines, according to a preset algorithm, at least between the first reference base station of the first base station and the first base station A preset channel phase difference.

The processing device of the coordinated transmission is between 0 and 2 π, and determines a phase difference between the first reference base station of the first base station and the at least one preset channel between the first base station according to a preset algorithm. For example, between 0 and 2 π, the n values are equally spaced as the phase difference of at least one preset channel between the first reference base station and the first base station of the first base station. For example, η=4, the phase difference of at least one preset channel between the first reference base station and the first base station determined by the processing device of the cooperative transmission is [0, π /2 , π , 3 π /2].

It should be noted that at least two base stations that perform channel phase compensation on the BF weight are neighboring base stations.

Further, if the value of the channel phase difference of the first reference base station is not 0, the channel between the first base station of the first base station and the first reference base station needs to be determined on the basis of the channel phase difference of the first reference base station. Phase difference. For example, the existing three base stations eNB1, eNB2, and eNB3 are adjacent to the base station eNB2, and the base station eNB2 is adjacent to the base station eNB3. When the channel phase difference between the base stations eNB1 and eNB2 is determined, the processing device that performs the coordinated transmission uses the base station eNB1 as the first reference base station and the base station eNB2 as the first base station. At this time, it is determined that the channel phase difference of the base station eNB1 is 0, and the base station The value of the channel phase difference of eNB2 is α. When determining the channel phase difference of the base stations eNB2 and eNB3, the cooperative transmitting processing device uses the base station eNB2 as the first reference base station and the base station eNB3 as the first base station. Since it has been determined that the channel phase difference of the base station eNB2 is α _ΐ that is, the channel phase of the base station 2 has been adjusted by α _ΐ , the base station eNB3 needs to determine the base station eNB3 based on the channel phase difference of the base station eNB2. If the channel phase difference is different, then the determined channel phase difference of the base station eNB3 is a i+ a ^ where a ₂ is the channel phase difference of the determined base station eNB3 when the value of the channel phase difference of the base station eNB2 is 0. value.

203. Send a channel phase difference of the first reference base station to the first reference base station, and send a channel phase difference of the first base station to the first base station, so that the first reference base station and The first base station performs channel phase compensation on the first BF weight according to the channel phase difference. The first BF weight refers to the BF weight after the original BF weight is compensated according to the compensation parameter of the BF. The original BF weight is a BF weight that is not compensated. Specifically, after determining the channel phase difference between the first reference base station and the first reference base station, the processing device of the coordinated transmission transmits the channel phase difference of the first reference base station to the first reference base station. That is, the channel phase difference of the first reference base station having a value of 0 is transmitted to the first reference base station such that the first reference performs channel phase compensation on the first BF weight according to the channel phase difference of 0.

The processing device of the coordinated transmission sends a phase difference between the first reference base station of the first base station and the first base station determined by the preset algorithm, and the periodic polling is sent to the The first base station is described.

And if the processing device that the coordinated transmission determines the channel phase difference between the first base station of the first base station and the first reference base station, sends the channel phase difference to the first base station, so that the first base station according to the channel phase difference pair A BF weight is used for channel phase compensation. If the processing device that the coordinated transmission determines the channel phase difference between the first base station of the first base station and the first reference base station, the channel phase between the first base station of the plurality of first base stations and the first reference base station may be used. Poor, periodic polling is sent to the first base station. Further, the processing device of the cooperative transmission transmits the channel phase difference to the first base station according to the period T. For example, if T milliseconds is one cycle, if the coordinated transmission process sets the channel phase difference to be in the next cycle in one cycle, the coordinated transmission process may send the channel phase difference to be _m . _d ( ₊₁ , m=l, 2 , ... , n where _∞ denotes the mth value of at least one channel phase difference of the first base station determined by the process of cooperative transmission. The example provides a method for cooperative transmission, after the processing device of the cooperative transmission determines the channel phase difference of the first base station acquired by the first base station and the first base station, and the channel phase difference of the first reference base station is sent to the first a base station and the first reference base station, so that after receiving the corresponding channel phase difference, the base station side can perform channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight, and perform channel phase compensation by using The first BF weight sends the data information to the UE. In this way, before the base station side transmits the data, the BF weight can be compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously send the data information to the UE are inconsistent. The effect of superimposing signals of at least two base stations that simultaneously transmit data information to the UE is improved, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the user's connection. Information quality. The embodiment of the present invention provides a method for cooperative transmission. As shown in FIG. 3, the method includes: Steps: Steps 304b, 305-315 are performed if the base station acquires the compensation parameter of the BF by the base station itself. If the base station acquires the compensation parameter of BF, it is transmitted through cooperation. If the device is acquired, steps 301-303, 304a, 305-315 are performed.

301. A processing device that cooperates to transmit determines a second reference base station, and a second base station. Specifically, the processing device of the coordinated transmission determines one of the at least two base stations that transmit data information to one UE, and determines the other base stations as the first base station.

It should be noted that the processing device of the coordinated transmission may determine a first reference base station in at least two base stations that send data information to one UE according to a preset algorithm, and may be in at least two base stations that send data information to one UE. The eNB is arbitrarily selected to determine that it is the first base station, and the present invention does not limit this.

302. The processing device of the coordinated transmission acquires an estimation matrix and an original BF weight of the uplink channel of the second reference base station and the second base station. Specifically, the process of acquiring, by the cooperative processing device, the estimation matrix of the uplink channel of the second base station and the second base station and the original BF weight is the same as the process of acquiring the estimation matrix of the uplink channel and the original BF weight, and may refer to Step 101, and details are not described herein again.

The optional cooperative transmitting processing device only obtains the estimation matrix of the uplink channel of the second base station and the original BF weight, and does not acquire the estimation matrix of the uplink channel of the second reference base station and the original BF weight.

303. The processing device of the coordinated transmission acquires the compensation of the beam assignment BF of the second reference base station and the second base station according to the estimation matrix of the uplink channel of the second base station and the second base station, and the original BF weight. parameter.

Specifically, the processing device for cooperative transmission is according to the formula: fi _k - angle ((H _U ^k _L ) ^T w _k Y ((H§ _L f

A ^{= 0 k =} g acquires the compensation parameters of the BF of the second base station and the second base station. Where angle represents the phase, g represents the second reference base station, ^ represents the original BF weight of the second base station g, H^ represents the estimation matrix of the uplink channel of the second base station k, and H represents the second reference base station g The estimation matrix of the upstream channel, T represents the transpose of the matrix, and Η represents the conjugate transpose of the matrix. Further, the process of the cooperatively transmitted processing device determining that the compensation parameter of BF is A is as follows.

Two base stations are taken as an example for description. For example, the estimation matrix of the downlink channel of the first base station to the UE is ^, the estimation matrix of the downlink channel of the second base station to the UE is, and the first base station calculates the BF right of a certain data stream to be sent according to the estimation matrix of the uplink channel. The value is ^, and the second base station obtains the BF weight of the data stream to be sent according to the calculation. The estimation matrix of the downlink channels of the two base stations to the UE is:

H _D ^x _L = ac{H _U ^x _L ) ^T H _D ² _L = bc(H _U ² _L ) ^T _; where a and b represent the first base station and the second base station, respectively

The relative difference between the transceiver channels is:

, c indicates that the UE's transceiver channel is relatively hi

The difference is: c = The estimated matrix of the weighted downlink equivalent channel is: ^{H = M} ^ and = ^M ^. Assuming that the phase compensation is performed on the second base station, and the compensated phase is Θ, the first base station is determined as the second reference base station, and the estimated matrix of the integrated equivalent channel of the first base station and the second base station received by the UE is: = ^{+ eidH} ff = ^H DL^ + ^Η 2 .

The receiving power of the UE is:

P = (H _eff ) ^H H _eff = (H , + H _D ² _L w ₂ ) ^H (H , + e ^ie H _DL w ₂ )

+ (H , fe ^ie H _DL w ₂ + [e ^ie H _DL w ₂ f

+ e ^je (H , H ₂ + (e ^je (H , ΐ H _D ² _L w ₂ ΐ

It should be noted that the sum of the squares of all the elements of the matrix H is obtained. If the adjustment maximizes P, then the sum of the last two terms in the above equation is required to be maximized, that is, β ^θ [ ^H DL ^W l ) HD ² L ^W 2 + ^eie { ^H DL ^W l ) ^H DL ^W 2 J \ Assumption + ^^ ¹ ^) ^ ² , then Max|e ^3⁄4 (H _D ¹ _L W _X ) H _D ² _L w ₂ (H _D ' _L W, ) H _D ² _L w ₂

= max [A + Bj + A- Bj)

= max {2^4} ^Larger , you need ^e , ^{HdlWi) ffmW2} is a real number, that is, the imaginary part is 0, so

Θ - -angle Η ) (H _D ² _L w ₂ )

- angle ( ^H DL ^W 2 f

- angle (bc(H _U ² _L fw ₂ ) ^H - angle conj(bc)ac{(H ²

)

- angle + angle (( ) ₂ ) {(H _U ^l _L ) ^T w _x assuming a - angle β - angle then: θ ^{= α +} β , since α is the relative difference ratio between the transmitting and receiving channels of the first base station and the second base station The phase, therefore, does not take into account its value, so θ = β.

The processing device of the coordinated transmission transmits the obtained compensation parameter of the BF of the second reference base station to the second reference base station, and sends the compensation parameter of the BF of the second base station to the second base station, The second reference base station and the second base station are compensated according to the compensation parameter of the BF to obtain the first BF weight. The base station receives the compensation parameter of the BF transmitted by the processing device that is cooperatively transmitted. Specifically, the processing device of the cooperative transmission uses the compensation parameter of the BF with a value of 0 as the compensation parameter of the BF of the second reference base station. If the base station is the second reference base station, the value of the compensation parameter of the BF acquired by the base station is 0. If the base station is the second base station, the compensation parameter of the BF acquired by the base station is β, = ngle[({H _U ^k _L ) ^T w _k ) ^H ((H§ _L ) ^T w _g )].

304b, the base station obtains the compensation parameter of the beamforming BF.

Specifically, the base station obtains the compensation parameter of the BF by itself, and may refer to step 101, and details are not described herein again.

305. The same as step 102, and details are not described herein again.

306. The same as step 201, and details are not described herein again. It should be noted that the first reference base station and the second reference base station determined by the processing device of the coordinated transmission may be the same base station or different base stations, which is not limited by the present invention.

307. The same as step 202, and details are not described herein again.

308. The processing device of the coordinated transmission sends the channel phase difference of the first reference base station to the first reference base station, and sends a channel phase difference of the first base station to the first base station, where the base station acquires a channel phase. difference.

Specifically, the processing device that the coordinated transmission sends the channel phase difference of the first reference base station to the first reference base station, and sends the channel phase difference of the first base station to the first base station, and Step 203 is the same and will not be described again here. The base station acquires the pass phase difference by receiving the channel phase difference transmitted by the processing device of the cooperative transmission.

If the base station is not the first reference base station, the base station acquires a channel phase difference between the base station and the first reference base station. The first reference base station is a reference base station when the first base station performs channel phase compensation. At this time, the base station is the first base station. If the base station is the first reference base station, the base station acquires a channel phase difference between the base station and the first base station to be 0. The base station is a reference base station when performing channel phase compensation on the first base station. It should be noted that, the present invention does not limit the order between the steps 301-305 and the steps 306-308, and may perform steps 301-305 before performing steps 306-308, or may perform steps 306-308 first. Steps 301 - 305, only one of which is shown in the drawing. 309. The same as step 103, and details are not described herein again.

310. The same as step 104, and details are not described herein again.

It should be noted that, if the base station is the serving base station of the UE, step 311-315 is performed; if the base station is not the serving base station of the UE, step 315 is performed.

311. If the base station is a serving base station of the UE, receive the received quality information fed back by the UE.

Specifically, after the base station performs channel phase compensation on the first BF weight by the channel phase difference, the base station transmits the data information by using the first BF weight that performs channel phase compensation, and the UE sends its own receiving quality information. Feedback to the serving base station. Optionally, the receiving quality information fed back by the UE includes: ACK (Acknowledgement) information, CQI (channel quality indication, channel quality indication). It should be noted that the received quality information fed back by the UE may further include other information, which is not limited by the present invention.

312. The base station sends the received quality information that is sent by the UE to the processing device of the coordinated transmission, so that the coordinated transmitting processing device determines the service of the UE according to the received quality information fed back by the UE. The channel phase difference corresponding to the base station and the cooperative base station of the UE. The processing device of the coordinated transmission receives the reception quality information fed back by the UE sent by the serving base station of the UE.

The cooperative base station of the UE is a base station that sends data information to the UE and is not a serving base station of the UE.

313. The processing device of the coordinated transmission calculates the performance parameter of the UE according to the received quality information fed back by the UE. Specifically, the processing device of the coordinated transmission according to the received quality information fed back by the UE sent by the serving base station of the UE, and the performance parameter of the UE at the current moment.

Optionally, the performance parameters of the UE include: spectrum efficiency and throughput of the UE.

314. The processing device of the coordinated transmission determines the optimal performance parameter of the UE according to the statistical performance parameter of the UE, and determines the serving base station and the UE of the UE corresponding to the performance parameter of the optimal UE. The phase difference of the channel corresponding to the cooperative base station. The cooperative base station of the UE is a base station that sends data information to the UE and is not a serving base station of the UE.

Specifically, the processing device of the coordinated transmission determines, in step 307, that the first base station has at least one channel phase difference, and the processing device that the cooperative transmission transmits, when transmitting the channel phase difference to the first base station, is sent according to the serving base station of the UE. The received quality information fed back by the UE counts the performance parameters of the UE in the case of transmitting a channel phase difference to the first base station. The processing device of the coordinated transmission determines that the phase difference of each channel of the first base station corresponds to the performance parameter of the UE, and determines the optimal UE according to the performance parameter of the channel corresponding to the phase difference of each channel of the first base station. The performance parameter is determined, and the channel phase difference of the first base station corresponding to the optimal UE performance parameter is determined, and the channel phase difference is sent to the first base station. That is to say, after determining the optimal UE performance parameter, the channel phase difference of the server of the UE corresponding to the optimal UE performance parameter and the channel phase difference of the cooperative base station are determined. Optionally, the step 307 may be: when determining the channel phase difference of the first base station, the channel phase difference of the first base station corresponding to the last determined optimal UE performance parameter may be determined. At least one channel of the first base station is out of phase.

Illustratively, if the channel phase difference of the first base station corresponding to the performance parameter of the optimal UE determined by the processing device of the last coordinated transmission is determined, the processing device of the coordinated transmission determines the phase difference of at least one channel of the first base station of the current time. At least one channel phase difference of the first base station of the current time may be determined according to a preset algorithm and based on the λ3, that is, the determined at least one channel phase difference of the first base station of the current time includes a value.

315. The processing device of the coordinated transmission sends the determined channel phase difference of the serving base station of the UE and the coordinated base station of the UE corresponding to the determined performance parameter of the optimal UE to the serving base station of the UE and the UE, respectively. Cooperative base station. The base station receives the channel phase difference transmitted by the processing device that is cooperatively transmitted. Specifically, the processing device that is cooperatively transmitted determines the channel phase difference of the UE serving base station corresponding to the optimal UE performance parameter according to the optimal UE performance parameter, and the channel phase difference of the cooperative base station, and the determined The channel phase difference of the UE serving base station corresponding to the performance parameter of the optimal UE is sent to the serving base station of the UE, and the channel phase difference of the coordinated base station corresponding to the determined optimal UE performance parameter is sent to the cooperative base station of the UE. That is, the channel phase difference of the first base station corresponding to the determined optimal UE performance parameter is sent to the first base. Station. The embodiment of the invention provides a method for cooperative transmission. The base station compensates the original BF weight by obtaining the compensation parameter of the BF, and obtains the first BF weight. The processing device of the coordinated transmission determines the channel phase difference of the acquired first base station and the channel phase difference of the first reference base station to the first base station and the first reference base station after determining the first base station and the first reference base station. After acquiring the channel phase difference, the base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight, and transmits data information to the UE by using the first BF weight of the channel phase compensation. In this way, before the data is transmitted by the base station, the BF weight is compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously transmit data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user.

Embodiments of the present invention further provide an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments. The embodiments of the present invention are applicable to base stations or UEs in various communication systems. FIG. 4 is a functional block diagram of a base station according to an embodiment of the present invention. Referring to FIG. 4, the base station includes: an obtaining unit 401, a compensation unit 402, and a sending unit 403.

The obtaining unit 401 is configured to obtain a compensation parameter of the beamforming BF.

Specifically, the acquiring unit 401 is specifically configured to obtain an original BF weight and an estimation matrix of the uplink channel, and obtain a compensation parameter of the BF according to the estimation matrix of the uplink channel and the original BF weight.

Further, the obtaining unit 401 acquires the compensation parameter of the BF according to the formula ^ = - _a "g / e ((HK _: , x)) ^T ^ ).

Where angle represents the phase, T represents the transpose of the matrix, H^ represents the matrix of the uplink channel of the base station k, ( ^: , ^x ) represents the Xth column element of the matrix, k represents the first base station, k = l, 2, . . . . , K; K represents the number of base stations transmitting data information to the UE, A represents

BF compensation parameters.

Alternatively, the obtaining unit 401 is specifically configured to receive a compensation parameter of the BF sent by the processing device that is cooperatively transmitted.

The compensation unit 402 is configured to compensate the original BF weight according to the compensation parameter of the BF acquired by the acquiring unit 401 to obtain a first BF weight. Specifically, the compensation unit 402 is specifically configured to compensate the original BF weight according to the formula=V^ ^a to obtain the first BF weight.

among them, ! ^ denotes the weight of the first BF of the base station k; ^ denotes the weight of the original BF of the base station k; k denotes the first base station, k = 1, 2, ..., K; The number of base stations that the UE transmits data information; indicates the BF phase compensation parameter of the base station k, j represents the imaginary unit, and A represents the compensation parameter of the BF.

The compensation unit 402 is further configured to perform channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight.

Specifically, the compensation unit 402 is specifically configured to perform channel phase compensation on the first BF weight according to a formula: = i^e^.

Where k denotes the first base station, k=l, 2, , Κ, K denotes the number of base stations transmitting data information to the UE; the first BF weight indicating that the base station k performs channel phase compensation; The first BF weight of k; _e ^1⁄2 represents the channel phase compensation parameter of base station k, j represents the imaginary unit, ^ represents the channel phase difference of base station k, the ^ is pre-acquired, and ^ e [0, 2 r] . The sending unit 403 is configured to send data information to the user equipment UE according to the weight of the first BF after the channel phase compensation obtained by the compensation unit 402.

The obtaining unit 401 is further configured to acquire a channel phase difference.

Specifically, the acquiring unit 401 is specifically configured to acquire a channel phase difference with the first reference base station if the base station is not the first reference base station.

The first reference base station is a reference base station when the base station performs channel phase compensation.

The acquiring unit 401 is specifically configured to: when the base station is the first reference base station, acquire a channel phase difference between the base station and the first base station to be 0.

The base station is a reference base station when performing channel phase compensation on the first base station. The foregoing base station, as shown in FIG. 5, further includes:

The receiving unit 404 is configured to receive, according to the serving base station of the UE, the receiving quality information fed back by the UE. The sending unit 403 is further configured to: feed back the UE received by the receiving unit 404. The received quality information is sent to the processing device of the coordinated transmission, so that the processing device that the coordinated transmission determines, according to the received quality information fed back by the UE, the serving base station of the UE and the coordinated base station of the UE. Channel phase difference.

It should be noted that, in hardware implementation, the foregoing sending unit may be a transmitter or a transceiver, and the above receiving unit may be a receiver or a transceiver, and the sending unit and the receiving unit may be integrated to form a transceiver unit, corresponding to hardware. Implemented as a transceiver. The above obtaining unit and the compensating unit may be embedded in the hardware of the base station in hardware or may be stored in the memory of the base station in software, so that the processor calls to perform the operations corresponding to the above modules. The processor can be a central processing unit (CPU), a microprocessor, a microcontroller, or the like.

The embodiment of the invention provides a base station, which compensates the original BF weight by obtaining the compensation parameter of the BF, and obtains the first BF weight. Channel phase compensation is performed on the first BF weight according to the channel phase difference and the first BF weight, and the data information is transmitted to the UE by using the first BF weight of the channel phase compensation. In this way, before the data is transmitted by the base station, the BF weight is compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously transmit data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. Referring to FIG. 6, the base station includes: a transmitter 601, a receiver 602, a memory 603, and a processor 604 connected to the transmitter 601, the receiver 602, and the memory 603, respectively. Of course, the base station may also include a common component such as an antenna, a baseband processing component, a medium-frequency processing component, and an input/output device, and the embodiment of the present invention is not limited thereto.

The memory 603 stores a set of program codes, and the processor 604 is configured to call the program code in the memory 603 to perform the following operations: Acquire the compensation parameters of the beamforming BF.

Specifically, an original BF weight and an estimation matrix of the uplink channel may be obtained; and the compensation parameter of the BF is obtained according to the estimation matrix of the uplink channel and the original BF weight. Further, the compensation parameter of the BF is obtained according to the formula ^ = -angle((H _U ^k _L (:, χ)) ^τ ^ ). Where angle represents the phase, T represents the transpose of the matrix, H^ represents the matrix of the uplink channel of base station k, ( ^: , ^x ) represents the Xth column element of the matrix, k represents the first base station, k = l, 2, ..., K; K represents the number of base stations transmitting data information to the UE, A represents

BF compensation parameters. Alternatively, the compensation parameter of the BF transmitted by the processing device of the cooperative transmission may be received by the receiver 602.

The original BF weight is compensated according to the obtained compensation parameter of the BF, and the first BF weight is obtained.

Specifically, the original BF weight is compensated according to the formula=V^ ^a , and the first BF weight is obtained. among them, ! ^ denotes the weight of the first BF of the base station k; ^ denotes the weight of the original BF of the base station k; k denotes the first base station, k = 1, 2, ..., K; K denotes the The number of base stations that the UE transmits data information; indicates the BF phase compensation parameter of the base station k, j represents the imaginary unit, and A represents the compensation parameter of the BF.

Channel phase compensation is performed on the first BF weight according to the channel phase difference and the first BF weight.

Specifically, according to the formula: =i^e ^; channel phase compensation is performed on the first BF weight.

Where k denotes the first base station, k=l, 2, , Κ, K denotes the number of base stations transmitting data information to the UE; the first BF weight indicating that the base station k performs channel phase compensation; The first BF weight of k; _e ^1⁄2 represents the channel phase compensation parameter of base station k, j represents the imaginary unit, ^ represents the channel phase difference of base station k, and the ^ is pre-acquired, and ^e[0, 2r].

The transmitter 601 is configured to send data information to the user equipment UE according to the obtained weight of the first BF after the channel phase compensation.

Get the channel phase difference.

Specifically, if the base station is not the first reference base station, the channel phase difference with the first reference base station is acquired. The first reference base station is a reference base station when the base station performs channel phase compensation.

In the case that the base station is the first reference base station, the channel phase difference between the base station and the first base station is obtained as 0.

The base station is a reference base station when performing channel phase compensation on the first base station. The receiver 602 is configured to receive, according to the serving base station of the UE, the receiving quality information fed back by the UE. The transmitter 601 is further configured to send, by the receiving unit 404, the received quality information fed back by the UE to the processing device of the cooperative transmission, so that the processing device that is jointly transmitted according to the received quality of the UE is received. And determining a channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE. The cooperative base station of the UE is a base station that sends data information to the UE and is not a serving base station of the UE. The embodiment of the invention provides a base station, which compensates the original BF weight by obtaining the compensation parameter of the BF, and obtains the first BF weight. Channel phase compensation is performed on the first BF weight according to the channel phase difference and the first BF weight, and the data information is transmitted to the UE by using the first BF weight of the channel phase compensation. In this way, before the data is transmitted by the base station, the BF weight is compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously transmit data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user.

FIG. 7 is a functional block diagram of a processing device for cooperative transmission according to an embodiment of the present invention. Referring to FIG. 7, the processing device of the cooperative transmission includes: a determining unit 701 and a sending unit 702.

The determining unit 701 is configured to determine the first reference base station and the first base station.

The determining unit 701 is further configured to determine a channel phase difference of the first reference base station and a channel phase difference of the first base station.

Specifically, the determining unit 701 is specifically configured to determine that a channel phase difference between the first reference base station and the first base station of the first reference base station is 0.

Determining, according to a preset algorithm, the first base station of the first base station and the first base At least one preset channel phase difference between stations.

The sending unit 702 is configured to send, by the determining unit 701, a channel phase difference of the first reference base station to the first reference base station, and send a channel phase difference of the first base station to the first And the base station, so that the first reference base station and the first base station perform channel phase compensation on the first BF weight according to the channel phase difference.

The first BF weight refers to the BF weight after the original BF weight is compensated according to the compensation parameter of BF.

Specifically, the sending unit 702 is specifically configured to: at least one preset channel phase between the first base station and the first base station of the first base station determined by the determining unit 701 according to a preset algorithm. Poor, periodic polling is sent to the first base station. The determining unit 701 is further configured to determine the second reference base station and the second base station.

The processing device of the cooperative transmission, as shown in FIG. 8, further includes:

The obtaining unit 703 is configured to obtain an estimated matrix and an original BF weight of the uplink channel of the second base station and the second base station. The acquiring unit 703 is further configured to acquire, according to the estimation matrix of the uplink channel of the second base station and the second base station, and the original BF weight, the beam assignment BF of the second reference base station and the second base station. Compensation parameters.

Specifically, the acquiring unit 703 is specifically configured to: according to the formula: k = angle

A ^{= 0 k =} g acquires the compensation parameters of the BF of the second base station and the second base station. Where angle represents the phase, g represents the second reference base station, ^ represents the original BF weight of the second base station g, H^ represents the estimation matrix of the uplink channel of the second base station k, and H represents the second reference base station g The estimation matrix of the upstream channel, T represents the transpose of the matrix, and Η represents the conjugate transpose of the matrix. The sending unit 702 is further configured to send, to the second reference base station, a compensation parameter of the BF of the second reference base station acquired by the acquiring unit 703, and the second base station The compensation parameter of the BF is sent to the second base station, so that the second reference base station and the second base station compensate the original BF weight according to the compensation parameter of the BF, to obtain the first BF weight. The processing device of the cooperative transmission, as shown in FIG. 9, further includes:

The receiving unit 704 is configured to receive, by the serving base station of the UE, the received quality information that is sent by the UE.

The statistic unit 705 is configured to collect, according to the received quality information fed back by the UE received by the receiving unit 704, the performance parameter of the UE. The determining unit 701 is specifically configured to determine an optimal UE performance parameter according to the performance parameter of the UE that is calculated by the statistics unit 705, and determine the UE corresponding to the optimal UE performance parameter. The channel phase difference corresponding to the serving base station and the cooperative base station of the UE.

The sending unit 702 is specifically configured to send, by the determining unit 701, the channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE to the serving base station of the UE and the UE, respectively. Cooperative base station.

Specifically, the sending unit 702 is configured to send a channel phase difference of the UE serving base station corresponding to the determined optimal UE performance parameter to the serving base station of the UE, and perform collaboration of the determined optimal UE performance parameter. The channel phase difference of the base station is transmitted to the cooperative base station of the UE. That is, the channel phase difference of the first base station corresponding to the determined optimal UE performance parameter is transmitted to the first base station.

It should be noted that, in hardware implementation, the foregoing sending unit may be a transmitter or a transceiver, and the above receiving unit may be a receiver or a transceiver, and the sending unit and the receiving unit may be integrated to form a transceiver unit, corresponding to hardware. Implemented as a transceiver. The above obtaining unit, determining unit and counting unit may be embedded in the hardware of the base station in hardware or may be stored in the memory of the base station in software, so that the processor calls to perform the operations corresponding to the above modules. The processor can be a central processing unit (CPU), a microprocessor, a microcontroller, or the like. It should be noted that the processing device of the cooperative transmission may be embedded in the hardware or independent of the base station, or may be separately configured as a processing device, which is not limited in the present invention. An embodiment of the present invention provides a processing device for cooperative transmission, where a processing device that cooperatively transmits determines a channel phase difference of a first base station that is to be obtained after the first base station and the first base station, and a channel phase of the first reference base station. The difference is sent to the first base station and the first reference base station, so that after receiving the corresponding channel phase difference, the base station side can perform channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight, and use The first BF weight of the channel phase compensation transmits data information to the UE. In this way, before the data is sent by the base station, the BF weight can be compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously send data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user. FIG. 10 is a schematic structural diagram of a processing device for cooperative transmission according to an embodiment of the present invention. Referring to FIG. 10, the processing device of the cooperative transmission includes a transmitter 1001, a receiver 1002, a memory 1003, and a processor 1004 connected to the transmitter 1001, the receiver 1002, and the memory 1003, respectively. Of course, the base station may also include a common component such as an antenna, a baseband processing component, a medium-frequency processing component, and an input/output device, and the embodiment of the present invention is not limited thereto.

The memory 1003 stores a set of program codes, and the processor 1004 is configured to call the program code in the memory 1003 to perform the following operations: determining the first reference base station and the first base station. Determining a channel phase difference of the first reference base station and a channel phase difference of the first base station.

Specifically, determining a channel phase difference between the first reference base station and the first base station of the first reference base station is 0. Determining, by the preset algorithm, a phase difference of at least one preset channel between the first reference base station and the first base station of the first base station. The transmitter 1001 is configured to send the determined channel phase difference of the first reference base station to the first reference base station, and send a channel phase difference of the first base station to the first base station, so that The first reference base station and the first base station perform channel phase compensation on the first BF weight according to the channel phase difference. The first BF weight refers to the BF weight after the original BF weight is compensated according to the compensation parameter of the BF. Specifically, the transmitter 1001 is specifically configured to perform a phase difference between the first reference base station of the first base station determined by the preset algorithm and at least one preset channel between the first base stations, and periodically polled. Send to the first base station.

Determining a second base station, and a second base station.

Obtaining an estimation matrix and an original BF weight of an uplink channel of the second base station and the second base station. And acquiring, according to the estimation matrix of the uplink channel of the second base station and the second base station, and the original BF weight, the compensation parameters of the beam assignment BF of the second reference base station and the second base station. Fi _k - angle ((H _U ^k _L fw _k ) ((H § _L fw Specifically, the compensation parameters of the BF of the second base station and the second base station are obtained according to the formula: A ^{= Q} A = g. Where angle represents the phase, g represents the second reference base station, ^ represents the original BF weight of the second base station g, H^ represents the estimation matrix of the uplink channel of the second base station k, and H represents the second reference base station g An estimation matrix of the uplink channel, T represents a transpose of the matrix, and Η represents a conjugate transpose of the matrix. The transmitter 1001 is further configured to send the acquired compensation parameter of the BF of the second reference base station to the second reference And transmitting, by the base station, the compensation parameter of the BF of the second base station to the second base station, so that the second reference base station and the second base station compensate the original BF weight according to the compensation parameter of the BF And obtaining the first BF weight. The receiver 1002 is configured to receive, by the serving base station of the UE, the received quality information that is sent by the UE.

And calculating performance parameters of the UE according to the received quality information fed back by the UE received by the receiver 1002. Determining an optimal performance parameter of the UE according to the statistical performance parameter of the UE; Determining a channel phase difference corresponding to the serving base station of the UE and the cooperative base station of the UE corresponding to the performance parameter of the optimal UE.

The transmitter 1001 is specifically configured to separately send the determined channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE to the serving base station of the UE and the cooperative base station of the UE.

And transmitting the channel phase difference of the UE serving base station corresponding to the determined optimal UE performance parameter to the serving base station of the UE, and transmitting the channel phase difference of the coordinated base station corresponding to the determined optimal UE performance parameter to the UE Cooperative base station. That is to say, the channel phase difference of the first base station corresponding to the determined optimal UE performance parameter is sent to the first base station. An embodiment of the present invention provides a processing device for cooperative transmission, where a processing device that cooperatively transmits determines a channel phase difference of a first base station that is to be obtained after the first base station and the first base station, and a channel phase of the first reference base station. The difference is sent to the first base station and the first reference base station, so that after receiving the corresponding channel phase difference, the base station side can perform channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight, and use The first BF weight of the channel phase compensation transmits data information to the UE. In this way, before the data is sent by the base station, the BF weight can be compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously send data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user.

The embodiment of the present invention provides a system for cooperative transmission. As shown in FIG. 11, the method includes: at least two base stations 1101, a user equipment UE1102, and a cooperatively transmitted processing device 1103. among them,

The base station 1101 is the base station described in the foregoing embodiment. The processing device 1103 for cooperative transmission is the processing device for cooperative transmission described in the above embodiments. The embodiment of the invention provides a method, a device and a system for cooperative transmission. The base station compensates the original BF weight by obtaining the compensation parameter of the BF, and obtains the first BF weight. The processing device of the coordinated transmission determines the channel phase difference of the acquired first base station and the channel phase difference of the first reference base station after transmitting the first base station and the first reference base station to the first base station and the first reference Base station. After acquiring the channel phase difference, the base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight, and sends the data information to the UE by using the first BF weight of the channel phase compensation. In this way, before the data is transmitted by the base station, the BF weight is compensated, thereby reducing the possibility that the signal phases of at least two base stations that simultaneously transmit data information to the UE are inconsistent, and at least simultaneously transmitting data information to the UE is improved. The effect of the signal superposition of the two base stations, thereby realizing the possibility of improving the phase-consistent signal received on the user side, and enhancing the quality of the received information of the user.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

A method for cooperative transmission, comprising:

The base station obtains a compensation parameter of the beamforming BF;

The base station compensates the original BF weight according to the compensation parameter of the BF to obtain a first BF weight;

The base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight; the channel phase difference is used for channel phase compensation of the first BF weight Parameter

The base station sends data information to the user equipment UE according to the first BF weight value after the channel phase compensation.

2. The method according to claim 1, wherein the acquiring parameters of the beamforming BF by the base station include:

Obtaining, by the base station, the original BF weight and an estimation matrix of an uplink channel;

The base station acquires a compensation parameter of the BF according to the estimation matrix of the uplink channel and the original BF weight.

The method according to claim 1, wherein the acquiring parameters of the beamforming BF by the base station include:

The base station receives a compensation parameter of the BF transmitted by the processing device that is cooperatively transmitted.

The method according to any one of claims 1-3, wherein before the base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight , Also includes:

The base station acquires a channel phase difference.

The method according to claim 4, wherein the acquiring, by the base station, the channel phase difference comprises:

If the base station is not the first reference base station, the base station acquires a channel phase difference between the base station and the first reference base station; wherein, the first reference base station is a reference when the first base station performs channel phase compensation. a base station; the base station is a first base station.

If the base station is the first reference base station, the base station acquires a channel phase difference between the base station and the first base station to be 0, where the base station is used as a reference for channel phase compensation of the first base station. Base station.

The method according to any one of claims 1-6, wherein after the base station sends data to the user equipment UE according to the weight of the first BF after the channel phase compensation, the base station further includes:

Receiving the received quality information fed back by the UE, and transmitting the received quality information fed back by the UE to the processing device of the coordinated transmission, so that the coordinated transmission is performed, if the base station is a serving base station of the UE, The processing device determines, according to the received quality information fed back by the UE, a channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE, where the coordinated base station of the UE sends data information to the UE and is not a UE. The base station of the serving base station.

8. The method of claim 2, wherein

And obtaining, by the base station, the compensation parameters of the BF according to the estimation matrix of the uplink channel and the original BF weight, including:

The base station acquires the compensation parameter of the BF according to the formula ^ = - a "g / e ((H ^ (:, x)) ^T ^); wherein angle represents the phase, T represents the transpose of the matrix, H ^ denotes the matrix of the uplink channel of the base station k, ( ^: , ^x ) denotes the Xth column element of the matrix, k denotes the first base station, k=l, 2, ...,

K; K represents the number of base stations transmitting data information to the UE, and A represents the compensation parameter of BF.

The method according to any one of claims 1 to 8, wherein the base station compensates the original BF weight according to the compensation parameter of the BF, and obtains the first BF weight: the base station according to Equation = V^ ^a compensates the original BF weight to obtain the first BF weight; where, represents the weight of the first BF of the base station k; ^ represents the weight of the original BF of the base station k; k represents The first few base stations, k=l, 2, , K; K indicates to the

The number of base stations that the UE transmits data information; indicates the BF phase compensation parameter of the base station k, j represents the imaginary unit, and A represents the compensation parameter of the BF.

The method according to any one of claims 1 to 9, wherein the base station performs channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight. :

The base station performs channel phase compensation on the first BF weight according to the formula: =ii e; wherein k represents the first base station, k=l, 2, ..., Κ, K represents the The number of base stations for which the UE transmits data information; the first BF weight indicating that the base station k has performed channel phase compensation; the first BF weight indicating the base station k; _e ^1⁄2 indicates the channel phase compensation parameter of the base station k, and j indicates the imaginary number Unit, ^ represents the channel phase difference of the base station k, the ^ is pre-acquired, and ^ e [0,2 r].

11. A method of cooperative transmission, characterized in that it comprises:

Determining a first base station and a first base station;

Determining a channel phase difference of the first reference base station and a channel phase difference of the first base station;

Transmitting, by the first reference base station, a channel phase difference to the first reference base station; and transmitting a channel phase difference of the first base station to the first base station, such that the first reference base station and the The first base station performs channel phase compensation on the first BF weight according to the channel phase difference; wherein the first BF weight refers to the BF weight after the original BF weight is compensated according to the compensation parameter of the BF.

The method according to claim 11, wherein the determining a channel phase difference of the first reference base station and a channel phase difference of the first base station comprises:

Determining, by the first reference base station, a channel phase difference between the first base station and the first base station is 0;

And determining, according to a preset algorithm, a phase difference of at least one preset channel between the first reference base station of the first base station and the first base station.

The method according to claim 12, wherein the sending the channel phase difference of the first base station to the first base station comprises:

The phase difference between the first reference base station of the first base station determined by the preset algorithm and the at least one preset channel between the first base station is periodically sent to the first base station.

The method according to any one of claims 11 to 13, further comprising: determining a second reference base station, and a second base station;

Obtaining an estimation matrix and an original BF weight of an uplink channel of the second base station and the second base station;

And acquiring, according to the estimation matrix of the uplink channel of the second base station and the second base station, and the original BF weight, the compensation parameters of the beam assignment BF of the second reference base station and the second base station;

Transmitting the obtained compensation parameter of the BF of the second base station to the second base station; and transmitting a compensation parameter of the BF of the second base station to the second base station, so that the second reference The base station and the second base station compensate the original BF weight according to the compensation parameter of the BF, to obtain the first BF weight.

The method according to claim 14, wherein the acquiring the second reference base station and the according to the estimation matrix of the uplink channel of the second base station and the second base station and the original BF weight The compensation parameters of the beam assignment BF of the second base station include: fi _k - angle ((H _U ^k _L ) ^T w _k Y ((H§ _L f according to the formula: A = o = g to obtain the second reference base station and the second The compensation parameter of the BF of the base station, where angle represents the obtained phase, g represents the second reference base station, _Wg represents the original BF weight of the second reference base station g, and H^ represents the estimation matrix of the uplink channel of the second base station k, H ^ represents an estimation matrix of the uplink channel of the second reference base station g,

T represents the transpose of the matrix, and Η represents the conjugate transpose of the matrix.

The method according to any one of claims 11 to 15, wherein the channel phase difference of the first reference base station is transmitted to the first reference base station; and the channel of the first base station is After the phase difference is sent to the first base station, the method further includes:

Receiving, by the serving base station of the UE, the received quality information that is sent by the UE; the performance parameter of the UE is collected according to the received quality information fed back by the UE; and determining the optimal UE according to the statistical performance parameter of the UE. And determining, by the performance parameter of the optimal UE, a channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE, where the coordinated base station of the UE sends data to the UE Information, and not the base station of the serving base station of the UE;

The channel phase differences corresponding to the determined serving base station of the UE and the coordinated base station of the UE are respectively sent to the serving base station of the UE and the cooperative base station of the UE.

17. A base station, comprising:

An obtaining unit, configured to obtain a compensation parameter of the beamforming BF;

a compensation unit, configured to compensate the original BF weight according to the compensation parameter of the BF acquired by the acquiring unit, to obtain a first BF weight;

The compensation unit is further configured to perform channel phase compensation on the first BF weight according to the channel phase difference and the first BF weight; the channel phase difference is used to use the first BF weight The parameters for channel phase compensation;

a sending unit, configured to perform, according to the compensation unit, the right of the first BF after the phase compensation of the channel The value sends data information to the user equipment UE.

18. The base station according to claim 17, wherein:

The acquiring unit is specifically configured to: obtain an original BF weight and an estimation matrix of an uplink channel; and obtain a compensation parameter of the BF according to the estimation matrix of the uplink channel and the original BF weight.

19. The base station according to claim 17, wherein:

The acquiring unit is specifically configured to receive a compensation parameter of the BF sent by the processing device that is cooperatively transmitted.

20. A base station according to any of claims 17-19, characterized in that

The acquiring unit is further configured to acquire a channel phase difference.

21. The base station according to claim 20, characterized in that

The acquiring unit is specifically configured to: when the base station is not the first reference base station, acquire a channel phase difference with the first reference base station; where the first reference base station is when the base station performs channel phase compensation Reference base station.

22. The base station according to claim 20, wherein:

The acquiring unit is specifically configured to: when the base station is the first reference base station, acquire a channel phase difference between the base station and the first base station to be 0, where the base station is the first base station Reference base station for channel phase compensation.

The base station according to any one of claims 17 to 22, further comprising: a receiving unit, configured to receive the feedback received by the UE if the base station is a serving base station of the UE Quality information;

The sending unit is further configured to send, by the receiving unit, the received quality information fed back by the UE to the processing device of the cooperative transmission, so that the processing device that is jointly transmitted according to the received quality of the UE And determining, by the information, the channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE, where the coordinated base station of the UE is a base station that sends data information to the UE and is not the serving base station of the UE.

24. A processing device for cooperative transmission, comprising:

a determining unit, configured to determine the first reference base station and the first base station;

The determining unit is further configured to determine a channel phase difference of the first reference base station and a channel phase difference of the first base station;

a sending unit, configured to send, by the determining unit, a channel phase difference of the first reference base station to the first reference base station; and send a channel phase difference of the first base station to The first base station, so that the first reference base station and the first base station perform channel phase compensation on the first BF weight according to the channel phase difference; wherein, the first BF weight refers to The BF weight of the BF compensation parameter after the original BF weight is compensated.

25. The processing apparatus according to claim 24, wherein

The determining unit is specifically configured to: determine that a channel phase difference between the first reference base station and the first base station of the first reference base station is 0;

26. The processing apparatus according to claim 25, wherein

The sending unit is specifically configured to use the phase difference of the at least one preset channel between the first reference base station and the first base station of the first base station determined by the determining unit according to a preset algorithm, a periodic round The inquiry is sent to the first base station.

The processing device according to any one of claims 24-26, wherein the determining unit is further configured to determine a second reference base station, and a second base station;

The processing device further includes:

An obtaining unit, configured to obtain an estimated matrix and an original BF weight of an uplink channel of the second base station and the second base station;

The acquiring unit is further configured to acquire, according to the estimation matrix of the uplink channel of the second base station and the second base station, and the original BF weight, the beam assignment BF of the second reference base station and the second base station. Compensation parameter

The sending unit is further configured to send, to the second reference base station, a compensation parameter of the BF of the second reference base station acquired by the acquiring unit, and send the compensation parameter of the BF of the second base station to the The second base station is configured to enable the second reference base station and the second base station to compensate the original BF weight according to the compensation parameter of the BF, to obtain the first BF weight.

28. The processing apparatus according to claim 27, wherein

The obtained unit is used for , according to the formula: k = angle

A ^{= 0 k =} S acquires the compensation parameters of the BF of the second base station and the second base station, where angle represents the phase, and g represents the second base station, ^ represents the original BF weight of the second reference base station g, H^ represents the estimation matrix of the uplink channel of the second base station k, H^ represents the estimation matrix of the uplink channel of the second reference base station g, and T represents the transposition of the matrix, Η Represents the conjugate transpose of the matrix.

The processing device according to any one of claims 24 to 28, further comprising:

a receiving unit, configured to receive, by the serving base station of the UE, the receiving quality information fed back by the UE;

a statistic unit, configured to collect, according to the received quality information fed back by the UE received by the receiving unit, a performance parameter of the UE;

The determining unit is specifically configured to determine an optimal UE performance parameter according to the performance parameter of the UE that is calculated by the statistics unit, and determine a service of the UE corresponding to the optimal UE performance parameter. a channel phase difference corresponding to the base station and the coordinated base station of the UE; where the coordinated base station of the UE is a base station that transmits data information to the UE and is not a serving base station of the UE;

The sending unit is specifically configured to send, to the serving base station of the UE and the cooperative base station of the UE, the channel phase difference corresponding to the serving base station of the UE and the coordinated base station of the UE determined by the determining unit, respectively .

30. A system for cooperative transmission, comprising: at least two base stations, a user equipment UE, and a processing device that is cooperatively transmitted;

The base station is the base station according to any one of claims 17-23;

The processing device for cooperative transmission is the processing device for cooperative transmission according to any one of claims 24-29.