CN108886200A - A kind of data transmission method and device - Google Patents
A kind of data transmission method and device Download PDFInfo
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Abstract
A kind of data transmission method and device, method include：Multiple UE in base station selected cell, the multiple UE include the first UE, the 2nd UE, the 3rd UE and the 4th UE；Wherein, the first UE is in the first beam coverage, and the 2nd UE is in the second beam coverage, and the 3rd UE is in third beam coverage, and the 4th UE is in the 4th beam coverage；First wave beam and the second wave beam belong to the wave beam of the first polarization direction of AAS, and third wave beam and the 4th wave beam belong to the wave beam of the second polarization direction of AAS；The wave beam of first polarization direction has the first angle of declination, and the wave beam of the second polarization direction has the second angle of declination；On identical running time-frequency resource, carried out data transmission by the first wave beam and the first UE, carried out data transmission by the second wave beam and the 2nd UE, carried out data transmission by third wave beam and the 3rd UE, and carried out data transmission by the 4th wave beam with the 4th UE.
Description
The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and apparatus.
The application of Multiple Input Multiple Output (MIMO) technology greatly increases the data transmission rate, however, the rate gain of the conventional single-user MIMO technology depends not only on the number of antennas of the transmitter, but also has certain requirements on the number of antennas of the receiver. Since the receiver is limited in size, it is usually not equipped with too many antennas, and the gain of the single-user MIMO technique is also limited in the wireless channel, when the correlation of the transmission/reception channel is strong, it is not possible to obtain a high spatial multiplexing gain.
In order to better utilize the spatial multiplexing gain of MIMO, multi-user MIMO technology is more applied. For the multi-user MIMO technology, how to reduce interference between multiple users is a key issue. For a Time Division Duplex (TDD) system, a transmitting end acquires downlink channel information by using reciprocity of uplink and downlink channels, and constructs mutually orthogonal beams to reduce interference between users. However, for a Frequency Division Duplex (FDD) system, it is difficult for the base station to obtain accurate downlink channel information, and the problem of interference between multiple users is difficult to avoid, which affects the performance of the multi-purpose MIMO.
Disclosure of Invention
The embodiment of the invention provides a data transmission method and a data transmission device, which are used for solving the problems that in the prior art, a base station end is difficult to acquire accurate downlink channel information, the problem of interference among multiple users is difficult to avoid, and the performance of multi-purpose MIMO is influenced.
In a first aspect, a data transmission method is provided, including:
a base station selects M User Equipment (UE) in a cell, wherein at least one UE in the M UE is in a beam coverage range with a first downward inclination angle, at least one UE in the M UE is in a beam coverage range with a second downward inclination angle, the beam with the first downward inclination angle belongs to a beam of an Active Antenna System (AAS) in a first polarization direction, the beam with the second downward inclination angle belongs to a beam of an AAS in a second polarization direction, the number of the beam with the first downward inclination angle and the number of the beam with the second downward inclination angle are both at least two, M is a positive integer greater than or equal to 2, and the base station covers the cell through the AAS;
and the base station performs data transmission with the M pieces of UE through wave beams corresponding to the M pieces of UE respectively on the same time-frequency resource according to different precoding matrixes.
In a second aspect, another data transmission method is provided, including:
a base station selects a plurality of User Equipment (UE) in a cell, wherein the UE comprises a first UE, a second UE, a third UE and a fourth UE; wherein the first UE is within a first beam coverage, the second UE is within a second beam coverage, the third UE is within a third beam coverage, and the fourth UE is within a fourth beam coverage; the first beam and the second beam belong to beams of an Active Antenna System (AAS) first polarization direction, and the third beam and the fourth beam belong to beams of the AAS second polarization direction; the beam of the first polarization direction has a first downtilt angle and the beam of the second polarization direction has a second downtilt angle, wherein the base station covers the cell through the AAS;
and the base station performs data transmission with the first UE through the first beam, performs data transmission with the second UE through the second beam, performs data transmission with the third UE through the third beam, and performs data transmission with the fourth UE through the fourth beam on the same time-frequency resource.
In a third aspect, a computer-readable storage medium is provided, in which executable program code is stored, the program code being configured to implement the method of the first or second aspect.
In a fourth aspect, a data transmission apparatus is provided, comprising means for performing the method of the first aspect or the second aspect.
In a fifth aspect, a base station is provided, which includes the apparatus provided in the fourth aspect.
In a sixth aspect, there is provided another base station comprising: a transceiver, a processor, and a memory, wherein: the processor reads the program in the memory and executes the method of the first aspect or the second aspect.
In the method and the device provided by the embodiment of the invention, in MU-MIMO, because narrow beams in different polarization directions have different downward inclination angles, the data of different UEs can be isolated in the vertical direction, the data of different UEs can be isolated in the horizontal direction by adopting different precoding matrixes to carry out precoding processing on the data of different UEs, and because the data of different UEs are effectively isolated in the horizontal and vertical directions, the interference among users is reduced during data transmission.
Fig. 1 is a schematic flowchart of a data transmission method according to a first embodiment of the present invention;
fig. 2 is a schematic flowchart of a data transmission method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an antenna array of the base station according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of 4 narrow beams formed in the embodiment of the present invention;
fig. 5 is a schematic diagram of an alternative mapping relationship between 4 narrow beams formed in an embodiment of the present invention and a dual polarized antenna in an AAS;
fig. 6 is a flowchart illustrating a data transmission method according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of a data transmission apparatus according to a fourth embodiment of the present invention;
fig. 8 is a schematic diagram of a base station according to a fourth embodiment of the present invention.
The narrow beams formed in the embodiment of the invention have certain spatial isolation, wherein the isolation of the narrow beams used by different terminals in the vertical direction can be realized by setting different downward inclination angles for the antennas in different polarization directions, and the isolation of the narrow beams used by different terminals in the horizontal direction can be realized by enabling different terminals to use different precoding matrixes. Due to the fact that the narrow beams formed in the embodiment of the invention have certain spatial isolation, interference among users can be reduced in multi-user Multiple input Multiple output (MU-MIMO for short), and performance of the MU-MIMO is improved.
In the embodiment of the present invention, an Active Antenna System (AAS) is used, and the AAS is a novel Radio frequency device in wireless communication, and may be defined as integration of an Antenna and a Radio frequency, and may be regarded as integration of a Remote Radio Unit (RRU) and the Antenna on a physical site, that is, functions of an original RRU Unit and functions of the Antenna are combined. Due to the characteristics of AAS integration, the array sub-array in the vertical direction and the array sub-array in the horizontal direction of the antenna can be controlled by adopting a radio frequency multi-channel technology, and the wave beams of the antenna in the vertical direction and the horizontal direction are flexibly controlled, so that the aims of improving the coverage quality of wireless signals and improving the network capacity are fulfilled.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
In an embodiment of the present invention, a data transmission method is provided, as shown in fig. 1, where the method includes:
s11, the base station selects M User Equipment (UE) in a cell, at least one UE in the M UE is in a beam coverage range with a first downward inclination angle, at least one UE in the M UE is in a beam coverage range with a second downward inclination angle, wherein the beam with the first downward inclination angle belongs to a beam of an Active Antenna System (AAS) in a first polarization direction, the beam with the second downward inclination angle belongs to a beam of the AAS in a second polarization direction, the number of the beam with the first downward inclination angle and the number of the beam with the second downward inclination angle are both at least two, M is a positive integer greater than or equal to 2, and the base station covers the cell through the AAS.
Wherein the first downtilt angle is greater than or less than the second downtilt angle.
And S12, the base station performs data transmission with the M UEs through the wave beams corresponding to the M UEs respectively according to different precoding matrixes on the same time-frequency resource.
In the embodiment of the invention, in MU-MIMO, because narrow beams in different polarization directions have different downward inclinations, the data of different UEs can be isolated in the vertical direction, and the data of different UEs can be isolated in the horizontal direction by adopting different precoding matrixes to carry out precoding processing on the data of different UEs, and because the data of different UEs are effectively isolated in the horizontal and vertical directions, the interference among users is reduced during data transmission.
The following takes AAS to form four narrow beams as an example, and details a data transmission method provided by the embodiment of the present invention.
In a second embodiment, in this embodiment, the first beam and the second beam belong to a beam in a first polarization direction of the AAS, and the third beam and the fourth beam belong to a beam in a second polarization direction of the AAS; the specific process that the beam of the first polarization direction has a first downtilt angle and the beam of the second polarization direction has a second downtilt angle is shown in fig. 2 includes the following steps:
s21, selecting a plurality of User Equipment (UE) in a cell by a base station, wherein the plurality of UE comprises a first UE, a second UE, a third UE and a fourth UE; wherein the first UE is within a first beam coverage, the second UE is within a second beam coverage, the third UE is within a third beam coverage, and the fourth UE is within a fourth beam coverage, the base station covers the cell through the AAS;
s22, the base station performs data transmission with the first UE through the first beam, performs data transmission with the second UE through the second beam, performs data transmission with the third UE through the third beam, and performs data transmission with the fourth UE through the fourth beam on the same time-frequency resource.
In this embodiment, the first beam and the second beam belong to a beam in an AAS first polarization direction, and the third beam and the fourth beam belong to a beam in an AAS second polarization direction, and the narrow beams in different polarization directions have different downtilts, so that the data of the first UE, the second UE, the third UE, and the fourth UE can be isolated in the vertical direction; on the same time-frequency resource, the data of the first UE, the second UE, the third UE and the fourth UE are respectively precoded by adopting different precoding matrixes, so that the data of the first UE, the second UE, the third UE and the fourth UE can be isolated in the horizontal direction, and the data of the first UE, the second UE, the third UE and the fourth UE are effectively isolated in the horizontal direction and the vertical direction, so that the interference among users is reduced during data transmission.
In a specific implementation, one possible implementation is: the base station judges whether to start MU-MIMO transmission on the same time-frequency resource according to the cell load condition in the cell, which specifically comprises the following steps:
the base station determines the cell load of a cell covered by the base station;
and the base station performs the selection of the plurality of UEs when determining that the cell load exceeds a load threshold.
Specifically, when the base station determines that the cell load exceeds the load threshold, the base station starts MU-MIMO transmission of a plurality of UEs on the same time-frequency resource, so that the time-frequency resource is fully utilized, and the cell load is reduced. If the cell load does not exceed the load threshold, the UE may transmit with different UEs on different time-frequency resources.
In a specific implementation, one possible implementation is: the base station selects a plurality of UEs, including:
the base station acquires Signal strengths of the UEs, where the Signal strengths may be uplink Reference Signal Received Power (RSRP) values, Reference Signal Received Quality (RSRQ) values, and the like of the UEs, and the embodiments of the present invention are not limited thereto;
the base station determines a signal intensity interval to which the signal intensities of the plurality of UE belong according to the signal intensities of the plurality of UE;
and the base station selects a first UE in the first beam coverage range, a second UE in the second beam coverage range, a third UE in the third beam coverage range and a fourth UE in the fourth beam coverage range according to the corresponding relation between the signal intensity interval and the beam coverage range.
Specifically, because different signal strength intervals correspond to different beam coverage ranges, the beam coverage ranges corresponding to the multiple UEs may be determined according to the signal strengths of the multiple UEs.
Further, the base station determines precoding matrices corresponding to the plurality of UEs according to a correspondence between the beam coverage and the precoding matrices, wherein the precoding matrices corresponding to the plurality of UEs are all precoding matrices with a rank of 2 in a codebook set.
For example, the Precoding matrices in the codebook set indicate (PMI for short) 2, 8, 12, and 15 are Precoding matrices with a rank of 2. Wherein:
precoding matrix with PMI of 2 is denoted as W2One possible implementation form is
The precoding matrix with PMI of 8 is denoted as W8One possible implementation form is
Precoding matrix with PMI of 12 is denoted as W12One possible implementation form is
Precoding matrix with PMI of 15 is denoted as W15One possible implementation form is
Further, in a possible implementation manner, the base station sends the PMIs of the precoding matrices corresponding to the multiple UEs to the corresponding UEs.
Specifically, the base station sends a PMI of a first precoding matrix corresponding to the first UE, sends a PMI of a second precoding matrix corresponding to the second UE, sends a PMI of a third precoding matrix corresponding to the third UE, and sends a PMI of a fourth precoding matrix corresponding to the fourth UE, wherein the first precoding matrix, the second precoding matrix, the third precoding matrix, and the fourth precoding matrix are precoding matrices with different ranks of 2 in a codebook set.
In a specific implementation, the UEs report PMIs of precoding matrices selected by the UEs from a codebook set to a base station based on channel measurement.
Correspondingly, after receiving the PMIs reported by the UEs, the base station performs the following processing:
when the base station determines that precoding matrixes corresponding to the PMIs reported by the UEs are different from precoding matrixes determined by the base station for the UEs, the base station performs precoding processing on data of the UEs respectively by adopting the precoding matrixes determined by the base station for the UEs.
Specifically, when the base station determines that a precoding matrix corresponding to the PMI reported by the first UE is different from a first precoding matrix determined by the base station for the first UE, the base station performs precoding processing on data of the first UE by using the first precoding matrix; when the base station determines that a precoding matrix corresponding to the PMI reported by the second UE is different from a second precoding matrix determined by the base station for the second UE, the base station performs precoding processing on data of the second UE by adopting the second precoding matrix; when the base station determines that a precoding matrix corresponding to the PMI reported by the third UE is different from a third precoding matrix determined by the base station for the third UE, precoding data of the third UE by using the third precoding matrix; and when the base station determines that the precoding matrix corresponding to the PMI reported by the fourth UE is different from the fourth precoding matrix determined by the base station for the fourth UE, the base station performs precoding processing on the data of the fourth UE by adopting the fourth precoding matrix.
Based on any of the above embodiments, in implementation, when the base station performs data transmission with the first UE through the first beam, a specific processing procedure is as follows:
the base station performs precoding processing on the data of the first UE according to a first equivalent precoding matrix, wherein the first equivalent precoding matrix is a matrix obtained by multiplying a first precoding matrix by a first weighting matrix, and the first precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and the base station maps the data after the pre-coding processing to the first wave beam for transmission.
One possible implementation form of the first weighting matrix is as follows:
based on the implementation form of the first weighting matrix, correspondingly, if the first precoding matrix is a precoding matrix whose PMI is 2 in the codebook set, the first equivalent precoding matrix specifically is: according to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the wave beam 0; accordingly, a UE that may be considered to be located within the coverage of beam 0 may use PMI2 for measurements.
If the first precoding matrix is a precoding matrix with PMI of 8 in the codebook set, the first equivalent precoding matrix specifically is: according to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 1; accordingly, a UE that may be considered to be within the coverage of beam 1 may use PMI8 for measurements.
If the first precoding matrix is a precoding matrix with PMI12 in the codebook set, the first equivalent precoding matrix specifically is: according to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 2; accordingly, a UE that may be considered to be within the coverage of beam 2 may use PMI12 for measurements.
If the first precoding matrix is a precoding matrix with PMI15 in the codebook set, the first equivalent precoding matrix specifically is: according to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 3; accordingly, a UE that may be considered to be within the coverage of beam 3 may use PMI15 for measurements.
As can be seen from the foregoing embodiments, according to the first equivalent precoding matrix, not only the data of the first UE is transmitted using the first beam, but also the interference condition of the data on the second beam, the third beam, and the fourth beam to the first UE can be known.
The formation of the above-mentioned narrow beams, i.e. beam 0, beam 1, beam 2 and beam 3, is described below with the distribution 2 x 4 of the antenna array of the AAS of the base station as an example.
Antenna array structure of base station as shown in fig. 3, 8TRX (8 antenna receive/transmit) dual polarized antennas form an antenna array of 2 rows and 4 columns. By controlling the downtilt angles of the antennas with different polarization directions, the downtilt angles of the antennas with the two polarization directions are different, specifically: setting a first downward inclination angle for a beam formed by 4 antennas with a polarization direction of +45 degrees, for example, setting a smaller downward inclination angle, so that the beam formed by the 4 antennas with the same polarization direction covers the outer circle; the beams formed by the 4 antennas with the polarization direction of-45 degrees are provided with a second downward inclination angle, for example, a downward inclination angle larger than the first downward inclination angle is provided, so that the beams formed by the 4 antennas with the same polarization direction cover the inner circle. Due to the fact that the antennas in different polarization directions are provided with different downward inclination angles, isolation of narrow beams used by different terminals in the vertical direction can be achieved. The antennas with different polarization directions are digitally weighted to obtain a plurality of narrow beams. Preferably, in consideration of the interference problem between narrow beams formed by 4 antennas in the same polarization direction, two beams are generated for each of the inner and outer beams in the digital weighting, so as to generate 4 narrow beams, as shown in fig. 4. In fig. 4, beam 0 is the left inner beam, beam 1 is the left outer beam, beam 2 is the right inner beam, and beam 3 is the right outer beam.
It should be noted that, in the embodiment of the present invention, "left" and "right" are used to distinguish narrow beams in the horizontal direction, and "inner" and "outer" are used to distinguish narrow beams in the vertical direction.
Based on any of the foregoing embodiments, in implementation, a processing procedure of the base station performing data transmission with the second UE through the second beam is similar to the processing procedure of the first UE, and specifically includes the following steps:
the base station performs precoding processing on the data of the second UE according to a second equivalent precoding matrix, and then maps the data after precoding processing to the second beam for transmission, wherein the second equivalent precoding matrix is a matrix obtained by multiplying a second precoding matrix by a first weighting matrix, and the second precoding matrix is a precoding matrix with a rank of 2 in a codebook set.
Based on any of the foregoing embodiments, in implementation, a processing procedure of the base station performing data transmission with the third UE through the third beam is similar to the processing procedure of the first UE, and specifically includes the following steps:
the base station performs precoding processing on data of the third UE according to a third equivalent precoding matrix, and then maps the data after precoding processing to the third beam for transmission, wherein the third equivalent precoding matrix is a matrix obtained by multiplying the third precoding matrix by the first weighting matrix, and the third precoding matrix is a precoding matrix with a rank of 2 in a codebook set.
Based on any of the foregoing embodiments, in implementation, a processing procedure of the base station performing data transmission with the fourth UE through the fourth beam is similar to the processing procedure of the first UE, and specifically includes the following steps:
the base station performs precoding processing on data of the fourth UE according to a fourth equivalent precoding matrix, and then maps the data after precoding processing to the fourth beam for transmission, wherein the fourth equivalent precoding matrix is a matrix obtained by multiplying the fourth precoding matrix by a set first weighting matrix, and the fourth precoding matrix is a precoding matrix with a rank of 2 in a codebook set.
In this embodiment of the present invention, the base station may map the data after precoding processing of the multiple UEs to the beams in different polarization directions of the AAS for transmission through a second weighting matrix.
Specifically, the base station maps the data after precoding processing of the first UE, the data after precoding processing of the second UE, the data after precoding processing of the third UE, and the data after precoding processing of the fourth UE to the first beam, the second beam, the third beam, and the fourth beam for transmission, respectively, through a second weighting matrix.
The second weighting matrix is a matrix with dimensions of P multiplied by Q, and elements with values of zero and elements with values of non-zero in the second weighting matrix are alternately distributed, wherein P is the number of dual-polarized antennas included in the AAS, and Q is the number of narrow beams formed. In the embodiment of the present invention, the number of the formed narrow beams is 4, that is, Q is 4.
In the embodiment of the present invention, one possible implementation form of the second weighting matrix is as follows:
by using the second weighting matrix, the data of the multiple UEs may be mapped to different beams for transmission, where the mapping relationship between the first beam, the second beam, the third beam, and the fourth beam and the dual-polarized antenna in the AAS is as shown in fig. 5.
The scheme provided by the embodiment of the invention is particularly suitable for a high-load scene, the higher the load is, the higher the probability of multi-user (MU) pairing is, and the average throughput of the cell can be obviously increased. The effective gain comes from the space division multiplexing gain of multiple users. The scheme provided by the embodiment of the invention can obtain larger spatial multiplexing gain, and the coverage ranges of the inner and outer rings are isolated by setting different downward inclination angles for the antennas in different polarization directions, so that the interference between the inner and outer beams is smaller.
In the embodiment of the present invention, in addition to the four-beam transmission method described in the embodiment shown in fig. 3, the base station may select a two-beam transmission method to perform data transmission according to a network load condition, such as a Resource Block (RB) usage condition.
In this way, the plurality of UEs selected by the base station in the cell include a fifth UE and a sixth UE, where the fifth UE is in the coverage of the first beam or the second beam, and the sixth UE is in the coverage of the third beam or the fourth beam; the first beam and the second beam belong to beams of an Active Antenna System (AAS) first polarization direction, and the third beam and the fourth beam belong to beams of the AAS second polarization direction; the beams of the first polarization direction have a first downtilt angle and the beams of the second polarization direction have a second downtilt angle.
In this manner, in order to fully utilize the beam for data transmission, the base station performs data transmission with the fifth UE through the first beam and the second beam to enhance the signal strength of the fifth UE, and the specific processing procedure is as follows:
the base station performs precoding processing on the data of the fifth UE according to a fifth equivalent precoding matrix, wherein the fifth equivalent precoding matrix is a matrix obtained by multiplying a fifth precoding matrix by a set third weighting matrix, and the fifth precoding matrix is a precoding matrix with a rank of 2 in a codebook set;
and the base station maps the data after the pre-coding processing to the first wave beam and the second wave beam for transmission.
Wherein, one possible implementation form of the third weighting matrix is:
based on the implementation form of the third weighting matrix, correspondingly, if the fifth precoding matrix is a precoding matrix whose PMI is 2 in the codebook set, the fifth equivalent precoding matrix specifically is: according to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on the beam 0 and the beam 1; accordingly, it can be considered that UEs located within the coverage of beam 0 and beam 1 can perform measurements using the PMI 2.
If the fifth precoding matrix is a precoding matrix with PMI of 8 in the codebook set, the fifth equivalent precoding matrix specifically is: according to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on the beam 0 and the beam 1; accordingly, it can be considered that UEs located within the coverage of beam 0 and beam 1 can perform measurements using the PMI 8.
If the first precoding matrix is a precoding matrix with PMI12 in the codebook set, the fifth equivalent precoding matrix specifically is: according to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on the beam 2 and the beam 3; accordingly, it can be considered that UEs located within the coverage of beam 2 and beam 3 can perform measurements using the PMI 8.
If the fifth precoding matrix is a precoding matrix with PMI of 15 in the codebook set, the fifth equivalent precoding matrix specifically is: according to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on the beam 2 and the beam 3; accordingly, it can be considered that UEs located within the coverage of beam 2 and beam 3 can perform measurements using the PMI 8.
As can be seen from the foregoing embodiments, according to the fifth equivalent precoding matrix, not only the data of the fifth UE transmitted using the first beam and the second beam, but also the interference of the data on the third beam and the fourth beam to the fifth UE can be obtained.
In this manner, the processing procedure of the base station performing data transmission with the sixth UE through the third beam and the fourth beam is similar to the processing procedure of the fifth UE, and specifically includes the following steps:
the base station performs precoding processing on the data of the sixth UE according to a sixth equivalent precoding matrix, and then maps the data after precoding processing to the third beam and the fourth beam for transmission, wherein the sixth equivalent precoding matrix is a matrix obtained by multiplying a sixth precoding matrix by the third weighting matrix, and the sixth precoding matrix is a precoding matrix with a rank of 2 in a codebook set.
In the embodiment of the invention, the base station can flexibly select a four-beam transmission mode and a two-beam transmission mode to transmit data or signaling. For example, when the network load is smaller than a set threshold, a two-beam transmission mode is selected to transmit data or signaling, so as to avoid the problem of beam resource waste caused by the existence of more idle beams; and when the network load is greater than or equal to the set threshold, selecting a four-beam transmission mode to transmit data or signaling so as to reduce the network load.
Based on any of the above embodiments, optionally, in the embodiment of the present invention, a 90 ° bridge matrix may also be used to perform weighting processing on the data after precoding processing of different UEs, so as to implement power sharing between antennas in different polarization directions. Specifically, when the base station maps the data of the multiple UEs to beams in different polarization directions for transmission, the specific processing procedure is as follows:
and the base station respectively carries out weighting processing on the data after the precoding processing of the plurality of UE according to the set 90-degree electric bridge matrix, and respectively maps the data after the weighting processing to the wave beams in different polarization directions for transmission.
Specifically, the base station performs precoding processing on the data of the UEs respectively according to the equivalent precoding matrices corresponding to the UEs, so as to map the data of the UEs to corresponding antenna ports; then, performing virtual beam transformation according to the data after precoding processing on the plurality of UEs to map the data of the plurality of UEs to antennas in different polarization directions; then, according to the 90 ° electrical bridge matrix, performing a first weighting process on the data after the virtual beam transformation process of the plurality of UEs, so as to make the power of the antennas in different polarization directions the same; then, performing power amplification processing on the data subjected to the first weighting processing of the plurality of UEs; then, according to the inverse matrix of the 90 ° electric bridge matrix, performing a second weighting process on the data after the power amplification process of the plurality of UEs; and finally, mapping the data subjected to the second weighting processing of the plurality of UEs to different beams respectively for transmission.
Wherein the 90 ° bridge matrix is
In the embodiment shown in fig. 2, in order to implement power equalization and sharing of beams with different polarization directions, in an alternative implementation manner, the base station performs weighting processing on data after precoding processing of the first UE according to the 90 ° bridge matrix, and maps the processed data of the first UE to the first beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the second UE, and mapping the processed data of the second UE to the second beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the third UE, and mapping the processed data of the third UE to the third beam for transmission; and according to the 90-degree bridge matrix, performing weighting processing on the data subjected to precoding processing of the fourth UE, and mapping the processed data of the fourth UE onto the fourth beam for transmission.
It should be noted that, in the two-beam transmission mode, the processing procedure of the data after precoding processing of the fifth UE and the data after precoding processing of the sixth UE by using the 90 ° bridge matrix is similar to the processing procedure of the first UE in the four-beam transmission mode, and is not illustrated here.
The following describes in detail a process flow of the base station to process data of the multiple UEs in the embodiment of the present invention with reference to fig. 6.
In a third embodiment, as shown in fig. 6, the data transmission of any UE is taken as an example, where the data sequence of the UE is s1, and the processing procedure is as follows: the base station employs an equivalent precoding matrix, which is recorded as precoding a data sequence s1, so as to map the data sequence s1 to different antenna ports, and this embodiment takes two antenna ports as an example, which is recorded as p1 and p 2; then, the base station performs virtual beam transformation on the data after precoding processing to map the data after precoding processing to antennas with different polarization directions, which are respectively denoted as q1 and q2, wherein a matrix used by the virtual beam transformation is a following matrix, the base station performs first weighting processing on the data after virtual beam transformation processing by using a set 90 ° bridge matrix, an obtained sequence is denoted as a following sequence, the base station performs power amplification processing and performs transformation by using an inverse matrix of the 90 ° bridge matrix, the obtained sequence is denoted as a final sequence, and the base station maps the data to a beam a or a beam B for transmission.
Since the 90 ° electrical bridge matrix is a U matrix, that is, after all the precoding matrices with rank 2 in the codebook set are polled, the powers of the antennas with different polarization directions can be made equal, that is, | v1| ═ v2|, so as to achieve the purpose of power equalization and sharing.
For example, a finite limit of c is traversed11And c21The results are shown in table 1:
TABLE 1
It can be seen that the equalization of power is achieved regardless of the form of the precoding matrix, and at the same time, when the precoding matrix is [ 11 ]]TAnd [ 1-1 ]]TWhen the power of the antennas of two polarization directions is completely concentrated to one polarization direction, the precoding matrix is [1 j ]]TAnd [ 1-j ]]TIn this case, the antennas in two polarization directions can share power, so that the power between the antennas in different polarization directions can be shared by weighting through the bridge matrix.
It should be noted that, in the embodiment of the present invention, it is described by taking an example that the AAS includes 8 dual-polarized antennas, the number of the dual-polarized antennas included in the AAS is not limited in the embodiment of the present invention, and in a scenario where other number of dual-polarized antennas (for example, the AAS includes 16 dual-polarized antennas), a processing procedure of data transmission is similar to that in the embodiment of the present invention, and is not illustrated here.
The above method process flow may be implemented by a software program, which may be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
Based on the same inventive concept, in a fourth embodiment of the present invention, there is provided a data transmission apparatus, as shown in fig. 7, the apparatus including: a selection module 71 and a processing module 72, wherein the selection module 71 and the processing module 72 may perform the method described in the embodiment shown in fig. 1, the embodiment shown in fig. 2, or the embodiment shown in fig. 6. A data transmission apparatus provided in an embodiment of the present invention is described below by taking as an example that the selection module 71 and the processing module 72 execute the method described in the embodiment shown in fig. 2. The method comprises the following specific steps:
a selecting module 71, configured to select a plurality of UEs in a cell, where the plurality of UEs includes a first UE, a second UE, a third UE, and a fourth UE; wherein the first UE is within a first beam coverage, the second UE is within a second beam coverage, the third UE is within a third beam coverage, and the fourth UE is within a fourth beam coverage; the first beam and the second beam belong to beams of an Active Antenna System (AAS) first polarization direction, and the third beam and the fourth beam belong to beams of the AAS second polarization direction; a beam of the first polarization direction has a first downtilt angle and a beam of the second polarization direction has a second downtilt angle, wherein the apparatus covers the cell through the AAS;
a processing module 72, configured to perform data transmission with the first UE through the first beam, perform data transmission with the second UE through the second beam, perform data transmission with the third UE through the third beam, and perform data transmission with the fourth UE through the fourth beam on the same time-frequency resource.
In a possible implementation manner, the selecting module 71 is specifically configured to:
selecting the plurality of UEs when a cell load of the cell exceeds a load threshold.
In a possible implementation manner, the selecting module 71 is specifically configured to:
acquiring signal strengths of the plurality of UEs;
determining a signal intensity interval to which the signal intensities of the plurality of UEs belong according to the signal intensities of the plurality of UEs;
and selecting a first UE in the first beam coverage range, a second UE in the second beam coverage range, a third UE in the third beam coverage range and a fourth UE in the fourth beam coverage range according to the corresponding relation between the signal intensity interval and the beam coverage range.
Optionally, the apparatus provided in the embodiment of the present invention further includes: an obtaining module, configured to obtain Signal strengths of the UEs, for example, the obtaining module respectively counts uplink rsrp (ul rsrp) values of Sounding Reference Signals (SRS) of the UEs on the first beam, the second beam, the third beam and the fourth beam.
Correspondingly, the selecting module 71 obtains the signal strengths of the UEs through the obtaining module; determining a signal intensity interval to which the signal intensities of the plurality of UEs belong according to the signal intensities of the plurality of UEs; and selecting a first UE in the first beam coverage range, a second UE in the second beam coverage range, a third UE in the third beam coverage range and a fourth UE in the fourth beam coverage range according to the corresponding relation between the signal intensity interval and the beam coverage range.
In a possible implementation manner, the processing module 72 is specifically configured to:
carrying out precoding processing on the data of the first UE according to a first equivalent precoding matrix, wherein the first equivalent precoding matrix is a matrix obtained by multiplying a first precoding matrix by a first weighting matrix, and the first precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
mapping the data after precoding processing to the first wave beam for transmission;
wherein the first weighting matrix is
In a possible implementation manner, the processing module 72 is specifically configured to:
carrying out precoding processing on the data of the second UE according to a second equivalent precoding matrix, wherein the second equivalent precoding matrix is a matrix obtained by multiplying a second precoding matrix by the first weighting matrix, and the second precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and mapping the data after the pre-coding processing to the second wave beam for transmission.
In a possible implementation manner, the processing module 72 is specifically configured to:
carrying out precoding processing on the data of the third UE according to a third equivalent precoding matrix, wherein the third equivalent precoding matrix is a matrix obtained by multiplying a third precoding matrix by the first weighting matrix, and the third precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and mapping the data after the pre-coding processing to the third wave beam for transmission.
In a possible implementation manner, the processing module 72 is specifically configured to:
carrying out precoding processing on the data of the fourth UE according to a fourth equivalent precoding matrix, wherein the fourth equivalent precoding matrix is a matrix obtained by multiplying the fourth precoding matrix by the first weighting matrix, and the fourth precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and mapping the data after the pre-coding processing to the fourth beam for transmission.
In a possible implementation manner, the processing module 72 is specifically configured to:
according to the set 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the first UE, and mapping the processed data of the first UE to the first beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the second UE, and mapping the processed data of the second UE to the second beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the third UE, and mapping the processed data of the third UE to the third beam for transmission; and according to the 90-degree bridge matrix, performing weighting processing on the data subjected to precoding processing of the fourth UE, and mapping the processed data of the fourth UE onto the fourth beam for transmission.
For the 90 ° bridge matrix in this embodiment, reference is specifically made to the related description in the second embodiment, and details are not repeated here.
Based on the same inventive concept, in a fifth embodiment of the present invention, a base station is provided, which includes the apparatus described in the embodiment shown in fig. 7.
A base station (e.g., access point) in this embodiment may refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, or an evolved Node B (NodeB or eNB or e-NodeB) in LTE, which is not limited in this application.
The structure and processing method of the base station according to the embodiment of the present invention will be described below with reference to a preferred hardware structure. As shown in fig. 8, in a fifth embodiment of the present invention, there is provided a base station, including a transceiver 81 and at least one processor 82 connected to the transceiver 81, wherein:
when the base station is running, the processor 82 reads the program in the memory 83, and executes the following processes:
selecting a plurality of User Equipment (UE) in a cell, wherein the UE comprises a first UE, a second UE, a third UE and a fourth UE; wherein the first UE is within a first beam coverage, the second UE is within a second beam coverage, the third UE is within a third beam coverage, and the fourth UE is within a fourth beam coverage; the first beam and the second beam belong to beams of an Active Antenna System (AAS) first polarization direction, and the third beam and the fourth beam belong to beams of the AAS second polarization direction; a beam of the first polarization direction has a first downtilt angle and a beam of the second polarization direction has a second downtilt angle, wherein the apparatus covers the cell through the AAS;
on the same time-frequency resource, performing data transmission with the first UE through the first beam, performing data transmission with the second UE through the second beam, performing data transmission with the third UE through the third beam, and performing data transmission with the fourth UE through the fourth beam;
a transceiver 81 for receiving and transmitting data under the control of the processor 82.
Wherein in fig. 8 the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 82 and various circuits of memory represented by memory 83 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 81 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 82 is responsible for managing the bus architecture and general processing, and the memory 83 may store data used by the processor 82 in performing operations.
In a possible implementation, the processor specifically performs, when selecting a plurality of UEs in a cell:
selecting the plurality of UEs when a cell load of the cell exceeds a load threshold.
In a possible implementation, the processor specifically performs, when selecting a plurality of UEs in a cell:
acquiring signal strengths of the plurality of UEs;
determining a signal intensity interval to which the signal intensities of the plurality of UEs belong according to the signal intensities of the plurality of UEs;
and selecting a first UE in the first beam coverage range, a second UE in the second beam coverage range, a third UE in the third beam coverage range and a fourth UE in the fourth beam coverage range according to the corresponding relation between the signal intensity interval and the beam coverage range.
In a possible implementation manner, when performing data transmission with the first UE through the first beam, the processor specifically performs:
carrying out precoding processing on the data of the first UE according to a first equivalent precoding matrix, wherein the first equivalent precoding matrix is a matrix obtained by multiplying a first precoding matrix by a first weighting matrix, and the first precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
mapping the data after precoding processing to the first wave beam for transmission;
wherein the first weighting matrix is
In a possible implementation manner, the processor specifically executes, when performing data transmission with the second UE through the second beam:
carrying out precoding processing on the data of the second UE according to a second equivalent precoding matrix, wherein the second equivalent precoding matrix is a matrix obtained by multiplying a second precoding matrix by the first weighting matrix, and the second precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and mapping the data after the pre-coding processing to the second wave beam for transmission.
In a possible implementation manner, the processor specifically executes, when performing data transmission with the third UE through the third beam:
carrying out precoding processing on the data of the third UE according to a third equivalent precoding matrix, wherein the third equivalent precoding matrix is a matrix obtained by multiplying a third precoding matrix by the first weighting matrix, and the third precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and mapping the data after the pre-coding processing to the third wave beam for transmission.
In a possible implementation manner, the processor specifically executes, when performing data transmission with the fourth UE through the fourth beam:
carrying out precoding processing on the data of the fourth UE according to a fourth equivalent precoding matrix, wherein the fourth equivalent precoding matrix is a matrix obtained by multiplying the fourth precoding matrix by the first weighting matrix, and the fourth precoding matrix is a precoding matrix with the rank of 2 in a codebook set;
and mapping the data after the pre-coding processing to the fourth beam for transmission.
In a possible implementation manner, when the processor performs data transmission with the first UE through the first beam, performs data transmission with the second UE through the second beam, performs data transmission with the third UE through the third beam, and performs data transmission with the fourth UE through the fourth beam on the same time-frequency resource, the processor specifically performs:
according to the set 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the first UE, and mapping the processed data of the first UE to the first beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the second UE, and mapping the processed data of the second UE to the second beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the third UE, and mapping the processed data of the third UE to the third beam for transmission; and according to the 90-degree bridge matrix, performing weighting processing on the data subjected to precoding processing of the fourth UE, and mapping the processed data of the fourth UE onto the fourth beam for transmission.
For the 90 ° bridge matrix in this embodiment, reference is specifically made to the related description in the second embodiment, and details are not repeated here.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (18)
- A method of data transmission, the method comprising:a base station selects a plurality of User Equipment (UE) in a cell, wherein the UE comprises a first UE, a second UE, a third UE and a fourth UE; wherein the first UE is within a first beam coverage, the second UE is within a second beam coverage, the third UE is within a third beam coverage, and the fourth UE is within a fourth beam coverage; the first beam and the second beam belong to beams of an Active Antenna System (AAS) first polarization direction, and the third beam and the fourth beam belong to beams of the AAS second polarization direction; the beam of the first polarization direction has a first downtilt angle and the beam of the second polarization direction has a second downtilt angle, wherein the base station covers the cell through the AAS;and the base station performs data transmission with the first UE through the first beam, performs data transmission with the second UE through the second beam, performs data transmission with the third UE through the third beam, and performs data transmission with the fourth UE through the fourth beam on the same time-frequency resource.
- The method of claim 1, wherein the base station selecting a plurality of UEs comprises:the base station selects the plurality of UEs when a cell load of the cell exceeds a load threshold.
- The method of claim 1 or 2, wherein the base station selecting a plurality of UEs comprises:the base station acquires the signal intensity of the plurality of UEs;the base station determines a signal intensity interval to which the signal intensities of the plurality of UE belong according to the signal intensities of the plurality of UE;and the base station selects a first UE in the first beam coverage range, a second UE in the second beam coverage range, a third UE in the third beam coverage range and a fourth UE in the fourth beam coverage range according to the corresponding relation between the signal intensity interval and the beam coverage range.
- The method of any of claims 1-3, wherein the base station transmitting data with the first UE over the first beam comprises:the base station performs precoding processing on the data of the first UE according to a first equivalent precoding matrix, wherein the first equivalent precoding matrix is a matrix obtained by multiplying a first precoding matrix by a first weighting matrix, and the first precoding matrix is a precoding matrix with the rank of 2 in a codebook set;the base station maps the data after precoding processing to the first wave beam for transmission;wherein the first weighting matrix is
- The method of claim 4, wherein the base station performs data transmission with the second UE via the second beam, comprising:the base station performs precoding processing on the data of the second UE according to a second equivalent precoding matrix, wherein the second equivalent precoding matrix is a matrix obtained by multiplying a second precoding matrix by the first weighting matrix, and the second precoding matrix is a precoding matrix with the rank of 2 in a codebook set;and the base station maps the data after the pre-coding processing to the second wave beam for transmission.
- The method of claim 5, wherein the base station performs data transmission with the third UE via the third beam, comprising:the base station performs precoding processing on the data of the third UE according to a third equivalent precoding matrix, wherein the third equivalent precoding matrix is a matrix obtained by multiplying a third precoding matrix by the first weighting matrix, and the third precoding matrix is a precoding matrix with a rank of 2 in a codebook set;and the base station maps the data after the pre-coding processing to the third wave beam for transmission.
- The method of claim 6, wherein the base station performs data transmission with the fourth UE via the fourth beam, comprising:the base station performs precoding processing on the data of the fourth UE according to a fourth equivalent precoding matrix, wherein the fourth equivalent precoding matrix is a matrix obtained by multiplying a fourth precoding matrix by the first weighting matrix, and the fourth precoding matrix is a precoding matrix with a rank of 2 in a codebook set;and the base station maps the data after the pre-coding processing to the fourth beam for transmission.
- The method of any of claims 4-7, wherein the base station performs data transmission with the first UE via the first beam, data transmission with the second UE via the second beam, data transmission with the third UE via the third beam, and data transmission with the fourth UE via the fourth beam, comprising:the base station performs weighting processing on the data after the precoding processing of the first UE according to a set 90-degree bridge matrix, and maps the processed data of the first UE to the first beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the second UE, and mapping the processed data of the second UE to the second beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the third UE, and mapping the processed data of the third UE to the third beam for transmission; and according to the 90-degree bridge matrix, performing weighting processing on the data subjected to precoding processing of the fourth UE, and mapping the processed data of the fourth UE onto the fourth beam for transmission.
- The method of claim 8 wherein said 90 ° bridge matrix is
- A data transmission apparatus, characterized in that the apparatus comprises:the system comprises a selection module, a first selection module and a second selection module, wherein the selection module is used for selecting a plurality of User Equipment (UE) in a cell, and the plurality of UE comprises a first UE, a second UE, a third UE and a fourth UE; wherein the first UE is within a first beam coverage, the second UE is within a second beam coverage, the third UE is within a third beam coverage, and the fourth UE is within a fourth beam coverage; the first beam and the second beam belong to beams of an Active Antenna System (AAS) first polarization direction, and the third beam and the fourth beam belong to beams of the AAS second polarization direction; a beam of the first polarization direction has a first downtilt angle and a beam of the second polarization direction has a second downtilt angle, wherein the apparatus covers the cell through the AAS;and the processing module is configured to perform data transmission with the first UE through the first beam, perform data transmission with the second UE through the second beam, perform data transmission with the third UE through the third beam, and perform data transmission with the fourth UE through the fourth beam on the same time-frequency resource.
- The apparatus of claim 10, wherein the selection module is specifically configured to:selecting the plurality of UEs when a cell load of the cell exceeds a load threshold.
- The apparatus of claim 10 or 11, wherein the selection module is specifically configured to:acquiring signal strengths of the plurality of UEs;determining a signal intensity interval to which the signal intensities of the plurality of UEs belong according to the signal intensities of the plurality of UEs;and selecting a first UE in the first beam coverage range, a second UE in the second beam coverage range, a third UE in the third beam coverage range and a fourth UE in the fourth beam coverage range according to the corresponding relation between the signal intensity interval and the beam coverage range.
- The apparatus of any one of claims 10-12, wherein the processing module is specifically configured to:carrying out precoding processing on the data of the first UE according to a first equivalent precoding matrix, wherein the first equivalent precoding matrix is a matrix obtained by multiplying a first precoding matrix by a first weighting matrix, and the first precoding matrix is a precoding matrix with the rank of 2 in a codebook set;mapping the data after precoding processing to the first wave beam for transmission;wherein the first weighting matrix is
- The apparatus of claim 13, wherein the processing module is specifically configured to:carrying out precoding processing on the data of the second UE according to a second equivalent precoding matrix, wherein the second equivalent precoding matrix is a matrix obtained by multiplying a second precoding matrix by the first weighting matrix, and the second precoding matrix is a precoding matrix with the rank of 2 in a codebook set;and mapping the data after the pre-coding processing to the second wave beam for transmission.
- The apparatus of claim 14, wherein the processing module is specifically configured to:carrying out precoding processing on the data of the third UE according to a third equivalent precoding matrix, wherein the third equivalent precoding matrix is a matrix obtained by multiplying a third precoding matrix by the first weighting matrix, and the third precoding matrix is a precoding matrix with the rank of 2 in a codebook set;and mapping the data after the pre-coding processing to the third wave beam for transmission.
- The apparatus of claim 15, wherein the processing module is specifically configured to:carrying out precoding processing on the data of the fourth UE according to a fourth equivalent precoding matrix, wherein the fourth equivalent precoding matrix is a matrix obtained by multiplying the fourth precoding matrix by the first weighting matrix, and the fourth precoding matrix is a precoding matrix with the rank of 2 in a codebook set;and mapping the data after the pre-coding processing to the fourth beam for transmission.
- The apparatus of any one of claims 13-16, wherein the processing module is specifically configured to:according to the set 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the first UE, and mapping the processed data of the first UE to the first beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the second UE, and mapping the processed data of the second UE to the second beam for transmission; according to the 90-degree bridge matrix, carrying out weighting processing on the data subjected to precoding processing of the third UE, and mapping the processed data of the third UE to the third beam for transmission; and according to the 90-degree bridge matrix, performing weighting processing on the data subjected to precoding processing of the fourth UE, and mapping the processed data of the fourth UE onto the fourth beam for transmission.
- The apparatus of claim 17 wherein said 90 ° bridge matrix is
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