WO2017166200A1

WO2017166200A1 - Data transmission method and device

Info

Publication number: WO2017166200A1
Application number: PCT/CN2016/078108
Authority: WO
Inventors: 金帆; 汪利标; 覃名富
Original assignee: 华为技术有限公司
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2017-10-05
Also published as: CN108886200A

Abstract

A data transmission method and device. The method comprises: a base station selects multiple UEs in a cell, the multiple UEs comprising a first UE, a second UE, a third UE, and a fourth UE, wherein the first UE is within coverage of a first beam, the second UE is within coverage of a second beam, the third UE is within coverage of a third beam, and the fourth UE is within coverage of a fourth beam; the first beam and the second beam are beams in a first direction of polarization of an AAS, and the third beam and the fourth beam are beams in a second direction of polarization of the ASS; the beams in the first direction of polarization have a first downtilt angle, and the beams in the second direction of polarization have a second downtilt angle; on same time-frequency resources, data transmission with the first UE is carried out by means of the first beam, data transmission with the second UE is carried out by means of the second beam, data transmission with the third UE is carried out by means of the third beam, and data transmission with the fourth UE is carried out by means of the fourth beam.

Description

Data transmission method and device

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method and apparatus.

Background technique

The application of Multiple Input Multiple Output (MIMO) technology has greatly improved the data transmission rate. However, the rate gain of the traditional single-user MIMO technology depends not only on the number of antennas of the transmitter, but also There are also certain requirements on the number of antennas of the receiver. Since the receiver is limited by its size, it is usually not possible to equip too many antennas, and the gain of single-user MIMO technology is also limited by the wireless channel. When the transmit/receive channel correlation is strong, a higher space division cannot be obtained. Use the gain.

In order to better utilize the space division multiplexing gain of MIMO, multi-user MIMO technology is more applicable. For multi-user MIMO technology, how to reduce interference between multiple users is a key issue. For a Time Division Duplex (TDD) system, the transmitting end uses the reciprocity of the uplink and downlink channels to acquire downlink channel information, and constructs mutually orthogonal beams to reduce inter-user interference. However, for the Frequency Division Duplex (FDD) system, it is difficult to obtain accurate downlink channel information at the base station, and the multi-user interference problem is difficult to avoid, which affects the performance of multi-purpose MIMO.

Summary of the invention

The embodiments of the present invention provide a data transmission method and apparatus, which are used to solve the problem that the base station side obtains accurate downlink channel information in the prior art, and the multi-user interference problem is difficult to avoid, which affects the performance of the multi-purpose MIMO.

In a first aspect, a data transmission method is provided, including:

The base station selects M user equipment UEs in the cell, at least one of the M UEs is in a beam coverage range with a first downtilt angle, and at least one of the M UEs is in the a beam coverage having a second downtilt angle, wherein the beam having the first downtilt angle belongs to a beam of a first polarization direction of the active antenna system AAS, and the beam having the second downtilt angle belongs to the AAS a beam in a bipolar direction, the number of beams having a first downtilt angle and the number of beams having a second downtilt angle are at least two, and M is a positive integer greater than or equal to 2, and the base station passes the AAS covers the cell;

The base station performs data transmission with the M UEs on the same time-frequency resource according to different precoding matrices through the beams corresponding to the M UEs.

In a second aspect, another data transmission method is provided, including:

The base station selects a plurality of user equipment UEs in the cell, where the multiple UEs include a first UE, a second UE, a third UE, and a fourth UE, where the first UE is in a first beam coverage range, The second UE is in the second beam coverage, the third UE is in the third beam coverage, and the fourth UE is in the fourth beam coverage; the first beam and the second beam belong to a beam of the first polarization direction of the active antenna system AAS, the third beam and the fourth beam belong to a beam of the second polarization direction of the AAS; the beam of the first polarization direction has a first downtilt angle The second polarization direction beam has a second downtilt angle, wherein the base station covers the cell by using the AAS;

The base station performs data transmission with the first UE by using the first beam, and performs data transmission with the second UE by using the second beam on the same time-frequency resource, and the third beam is used to The third UE performs data transmission, and performs data transmission with the fourth UE by using the fourth beam.

In a third aspect, a computer readable storage medium is provided, wherein executable program code is stored, the program code being used to implement the method of the first aspect or the second aspect.

In a fourth aspect, there is provided a data transmission apparatus comprising means for performing the method of the first aspect or the second aspect.

In a fifth aspect, a base station is provided, comprising the apparatus provided by the fourth aspect.

In a sixth aspect, a base station is provided, including: a transceiver, a processor, and a memory, wherein: the processor reads a program in the memory, performing the first aspect or the second aspect Methods.

In the method and apparatus provided by the embodiments of the present invention, in MU-MIMO, since narrow beams of different polarization directions have different downtilt angles, data of different UEs may be vertically separated by using different precoding. The matrix pre-codes the data of different UEs, so that the data of different UEs can be isolated in the horizontal direction. Since the data of different UEs are effectively isolated in the horizontal and vertical directions, the data transmission is reduced during the user. interference.

DRAWINGS

1 is a schematic flowchart of a data transmission method according to Embodiment 1 of the present invention;

2 is a schematic flowchart of a data transmission method according to Embodiment 2 of the present invention;

3 is a schematic structural diagram of an antenna array of the base station according to an embodiment of the present invention;

4 is a schematic structural diagram of four narrow beams formed in an embodiment of the present invention;

FIG. 5 is a schematic diagram of an optional mapping relationship between four narrow beams formed in an embodiment of the present invention and a dual-polarized antenna in an AAS;

FIG. 6 is a schematic flowchart diagram of a data transmission method according to Embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of a data transmission apparatus according to Embodiment 4 of the present invention; FIG.

FIG. 8 is a schematic diagram of a base station according to Embodiment 4 of the present invention.

detailed description

The narrow beams formed in the embodiments of the present invention have a certain degree of spatial isolation. In the vertical direction, the narrow beams of different terminals can be isolated in the vertical direction by setting different downtilt angles for the antennas in different polarization directions. By using different precoding matrices for different terminals, the narrow beams of different terminals can be isolated in the horizontal direction. Since the narrow beams formed in the embodiment of the present invention have a certain spatial isolation degree, the interference between users can be reduced in the multi-user multiple input multiple output (Multi-user MIMO, MU-MIMO), thereby improving the MU- MIMO performance.

In the embodiment of the present invention, an Active Antenna System (AAS) is used. AAS is a new type of RF device in wireless communication. It can be defined as the integration of antenna and radio. It can be regarded as the integration of Remote Radio Unit (RRU) and antenna at the physical site. The function of the RRU unit is combined with the function of the antenna. Due to the characteristics of AAS integration, the RF multi-channel technology can be used to control the vertical array of antennas and the array of horizontal arrays, and the antennas in the vertical and horizontal directions can be flexibly controlled to improve the coverage of wireless signals. Quality improves the purpose of network capacity.

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the first embodiment of the present invention, a data transmission method is provided. As shown in FIG. 1, the method includes:

S11. The base station selects M user equipment UEs in the cell, where at least one of the M UEs is in a beam coverage range with a first downtilt angle, and at least one UE of the M UEs is in a second downtilt angle. Within a beam coverage, wherein the beam having the first downtilt angle belongs to a beam of a first polarization direction of the active antenna system AAS, and the beam having the second downtilt angle belongs to a beam of the second polarization direction of the AAS And the number of the beam having the first downtilt angle and the beam having the second downtilt angle are at least two, and M is a positive integer greater than or equal to 2, and the base station covers the cell by using the AAS.

Wherein the first downtilt angle is greater than or less than the second downtilt angle.

S12: The base station performs data transmission with the M UEs by using the beams corresponding to the M UEs according to different precoding matrices on the same time-frequency resource.

In the embodiment of the present invention, in the MU-MIMO, since the narrow beams of different polarization directions have different downtilt angles, the data of different UEs can be isolated in the vertical direction, and different precoding matrices are used for different UEs. The data is pre-coded to realize the isolation of data of different UEs in the horizontal direction. Since the data of different UEs are effectively isolated in the horizontal and vertical directions, the interference between users is reduced during data transmission.

The following describes the data transmission method provided by the embodiment of the present invention in detail by taking four narrow beams formed by the AAS as an example.

Embodiment 2 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 beam in the direction has a first downtilt angle, and the beam in the second polarization direction has a second downtilt angle. The specific process is as shown in FIG. 2, and includes the following steps:

S21. The base station selects multiple user equipments in the cell, where the multiple UEs include the first UE, the second UE, the third UE, and the fourth UE. The first UE is in the first beam coverage area. The second UE is in the second beam coverage, the third UE is in the third beam coverage, and the fourth UE is in the fourth beam coverage, and the base station covers the Community

S22. The base station performs data transmission with the first UE by using the first beam, and performs data transmission with the second UE by using the second beam, by using the third beam. The beam performs data transmission with the third UE, and performs data transmission with the fourth UE by using the fourth beam.

In this embodiment, the first beam and the second beam belong to a beam of a first polarization direction of the AAS, and the third beam and the fourth beam belong to a beam of the second polarization direction of the AAS, and the narrow beam has different polarization directions. The data of the first UE, the second UE, the third UE, and the fourth UE are isolated in the vertical direction according to different downtilt angles; on the same time-frequency resource, the first is obtained by using different precoding matrices respectively. The data of the UE, the second UE, the third UE, and the fourth UE are pre-coded, and the data of the first UE, the second UE, the third UE, and the fourth UE are isolated in the horizontal direction, because the first UE The data of the second UE, the third UE, and the fourth UE are effectively isolated in both the horizontal and vertical directions, thereby reducing interference between users during data transmission.

In a specific implementation, a possible implementation manner is: the base station determines whether to enable MU-MIMO transmission on the same time-frequency resource according to the cell load condition in the cell, as follows:

Determining, by the base station, a cell load of a cell covered by the base station;

The base station performs selection of the multiple UEs when determining that the cell load exceeds a load threshold.

Specifically, the base station starts multiple UEs when determining that the cell load exceeds a load threshold. MU-MIMO transmission on the same time-frequency resource, thereby making full use of time-frequency resources and reducing cell load. 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, a possible implementation manner is: the base station selects multiple UEs, including:

The base station acquires signal strengths of the multiple UEs, where the signal strength may be an Reference Signal Received Power (RSRP) value and a reference signal reception quality of the multiple UEs (Reference Signal) Received Quality, RSRQ), etc., are not limited in the embodiment of the present invention;

Determining, by the base station, a signal strength interval to which the signal strengths of the multiple UEs belong according to signal strengths of the multiple UEs;

The base station selects, according to the correspondence between the signal strength interval and the beam coverage range, the first UE in the first beam coverage, the second UE in the second beam coverage, the third UE in the third beam coverage, and the third The fourth UE within the coverage of the four beams.

Specifically, the different signal strength intervals correspond to different beam coverage ranges, and according to the signal strengths of the multiple UEs, the beam coverage ranges corresponding to the multiple UEs may be determined.

Further, the base station determines a precoding matrix corresponding to the multiple UEs according to a correspondence between a beam coverage range and a precoding matrix, where a precoding matrix corresponding to the multiple UEs is a rank in a codebook set. A precoding matrix of 2.

For example, a precoding matrix indicator (PMI) in the codebook set is a precoding matrix with a rank of 2 for precoding matrices of 2, 8, 12, and 15. among them:

A precoding matrix with a PMI of 2 is denoted as W ₂ , a possible implementation form is

A precoding matrix with a PMI of 8 is denoted as W ₈ , a possible implementation form is

A precoding matrix with a PMI of 12 is denoted as W ₁₂ , a possible implementation form is

A precoding matrix with a PMI of 15 is denoted as W ₁₅ , a possible implementation form is

Further, in a possible implementation, the base station sends the PMI of the precoding matrix corresponding to the multiple UEs to the corresponding UE.

Specifically, the base station sends the PMI of the first precoding matrix corresponding to the first UE to the first UE, and sends the PMI of the second precoding matrix corresponding to the second UE to the second UE, and the third UE corresponds to the third UE. The PMI of the precoding matrix is sent to the third UE, and the PMI of the fourth precoding matrix corresponding to the fourth UE is sent to the fourth UE, where the first precoding matrix, the second precoding matrix, the third precoding matrix, and The fourth precoding matrix is a different precoding matrix with a rank of 2 in the codebook set.

In a specific implementation, the multiple UEs report the PMI of the precoding matrix selected by the multiple UEs from the codebook set to the base station based on the channel measurement.

Correspondingly, after receiving the PMI reported by the multiple UEs, the base station performs the following processing:

When the base station determines that the precoding matrix corresponding to the PMI reported by the multiple UEs is different from the precoding matrix determined by the base station for the multiple UEs, the base station uses the base station as the multiple The precoding matrix determined by the UE performs precoding processing on the data of the plurality of UEs, respectively.

Specifically, when the base station determines that the precoding matrix corresponding to the PMI reported by the first UE is different from the first precoding matrix determined by the base station for the first UE, the base station adopts a first precoding matrix pair. The data of the first UE is pre-coded; the base station determines that the precoding matrix corresponding to the PMI reported by the second UE and the second precoding matrix determined by the base station for the second UE are not Simultaneously, precoding the data of the second UE by using a second precoding matrix; the base station determining, by the base station, a precoding matrix corresponding to the PMI reported by the third UE, and the base station being the third UE When the third precoding matrix is different, the data of the third UE is pre-coded by using a third precoding matrix; the base station determines the precoding matrix corresponding to the PMI reported by the fourth UE. The fourth precoding matrix determined by the base station for the fourth UE is different The fourth pre-coding matrix is used to perform pre-coding processing on the data of the fourth UE.

Based on any of the foregoing embodiments, in the implementation, when the base station performs data transmission with the first UE by using the first beam, the specific processing procedure is as follows:

The base station performs precoding processing on the data of the first UE according to the first equivalent precoding matrix, where the first equivalent precoding matrix is a matrix obtained by multiplying the first precoding matrix by the first weighting matrix, The first precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The base station maps the pre-coded data to the first beam for transmission.

Wherein, a possible implementation form of the first weighting matrix is:

Based on the implementation form of the first weighting matrix, if the first precoding matrix is a precoding matrix with a PMI of 2 in the codebook set, the first equivalent precoding matrix is specifically:

According to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 0; correspondingly, the UE that is considered to be within the coverage of the beam 0 can be measured by using the PMI2.

If the first precoding matrix is a precoding matrix with a PMI of 8 in the codebook set, the first equivalent precoding matrix is specifically:

According to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 1; correspondingly, the UE located within the coverage of the beam 1 can be measured by using the PMI 8.

If the first precoding matrix is a precoding matrix with a PMI of 12 in the codebook set, the first equivalent precoding matrix is specifically:

According to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 2; correspondingly, the UE located within the coverage of the beam 2 can be measured by using the PMI 12.

If the first precoding matrix is a precoding matrix with a PMI of 15 in the codebook set, the first equivalent precoding matrix is specifically:

According to the obtained first equivalent precoding matrix, the data of the first UE is transmitted on the beam 3; correspondingly, the UE that is considered to be within the coverage of the beam 3 can be measured by using the PMI 15.

It can be seen from the foregoing embodiment that, according to the first equivalent precoding matrix, not only the data of the first UE is used, but the second beam and the third beam are also known. The interference condition of the data on the fourth beam to the first UE.

The following describes the formation process of the narrow beams, that is, beam 0, beam 1, beam 2, and beam 3, by taking the distribution 2*4 of the antenna array of the AAS of the base station as an example.

The antenna array structure of the base station is as shown in FIG. 3. The 8TRX (8-antenna reception/transmission) dual-polarized antenna forms an antenna array of 2 rows and 4 columns. By controlling the downtilt angle of the antennas having different polarization directions, the downtilt angles of the antennas in the two polarization directions are different, specifically: the beam formed by the antennas having the polarization direction of +45 degrees sets the first downtilt angle, such as Setting a small downtilt angle so that the beam formed by the four antennas in the same polarization direction covers the outer circle; the beam formed by the four antennas having the polarization direction of -45 degrees sets the second downtilt angle, such as setting the first A downtilt angle with a large downtilt angle, so that the beam formed by the four antennas in the same polarization direction covers the inner ring. Since the antennas with different polarization directions are set with different downtilt angles, the vertical beams of different terminals can be isolated in the vertical direction. A plurality of narrow beams can be obtained by digitally weighting antennas of different polarization directions. Preferably, considering the interference problem between the narrow beams formed by the four antennas in the same polarization direction, when digital weighting is performed, two beams are generated for the inner and outer ring beams respectively, thereby generating four narrow beams, FIG. 4 Show. In Figure 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 the implementation, the processing procedure of the base station performing data transmission by using the second beam and the second UE is similar to the processing procedure of the first UE, as follows:

The base station performs precoding processing on the data of the second UE according to the second equivalent precoding matrix, and then maps the precoded data to the second beam for transmission, where the second The equivalent precoding matrix is a matrix obtained by multiplying the second precoding matrix by the first weighting matrix, and the second precoding matrix is a precoding matrix of rank 2 in the codebook set.

Based on any of the foregoing embodiments, in the implementation, the processing procedure of the base station performing data transmission by using the third beam and the third UE is similar to the processing procedure of the first UE, as follows:

The base station performs precoding processing on the data of the third UE according to the third equivalent precoding matrix, and then maps the precoded data to the third beam for transmission, where the third The equivalent precoding matrix is a matrix obtained by multiplying a third precoding matrix and a first weighting matrix, and the third precoding matrix is a precoding matrix with a rank of 2 in the codebook set.

Based on any of the foregoing embodiments, in the implementation, the processing procedure of the base station performing data transmission by using the fourth beam and the fourth UE is similar to the processing procedure of the first UE, as follows:

The base station performs precoding processing on the data of the fourth UE according to the fourth equivalent precoding matrix, and then maps the precoded data to the fourth beam for transmission, where the fourth The equivalent precoding matrix is a matrix obtained by multiplying a fourth precoding matrix by a set first weighting matrix, and the fourth precoding matrix is a precoding matrix with a rank of 2 in the codebook set.

In the embodiment of the present invention, the base station may map the pre-coded data of the multiple UEs to the beams of different polarization directions of the AAS for transmission by using the second weighting matrix.

Specifically, the base station separately performs precoding processed data of the first UE, precoding processed data of the second UE, and precoding processing of the third UE by using a second weighting matrix The data and the pre-coded data of the fourth UE are mapped to the first beam, the second beam, the third beam, and the fourth beam for transmission.

The second weighting matrix is a P×Q-dimensional matrix, and an element having a value of zero in the second weighting matrix and an element having a value other than zero are alternately distributed, wherein P is the AAS including dual polarization. The number of antennas, Q is the number of narrow beams formed. In the embodiment of the present invention, the number of narrow beams formed is 4, that is, Q is 4.

In the embodiment of the present invention, a possible implementation form of the second weighting matrix is as follows:

The data of the multiple UEs may be mapped to different beams for transmission by using the foregoing second weighting matrix, where the first beam, the second beam, the third beam, and the fourth beam are dual-polarized antennas in the AAS. The mapping relationship between them is shown in Figure 5.

The solution provided by the embodiment of the present invention is especially applicable to a high-load scenario. The higher the load, the greater the probability of multi-user (MU) pairing, and the average throughput of the cell is significantly increased. The effective gain is derived from the multi-user spatial division multiplexing gain. The solution provided by the embodiment of the present invention can obtain a large spatial multiplexing gain, and by setting different downtilt angles for antennas with different polarization directions, the coverage of the inner and outer rings is isolated, and therefore, the interference between the inner and outer beams is also Smaller.

In the embodiment of the present invention, in addition to the data transmission using the four-beam transmission manner described in the foregoing embodiment shown in FIG. 3, the base station may also be used according to a network load condition, such as a resource block (Resource Block, RB). In the case, the two-beam transmission method is selected for data transmission.

In this manner, the multiple UEs selected by the base station in the cell include a fifth UE and a sixth UE, where the fifth UE is in a first beam or a second beam coverage, and the sixth UE is in the a third beam or a fourth beam coverage; the first beam and the second beam belong to a beam of a first polarization direction of the active antenna system AAS, and the third beam and the fourth beam belong to the A beam in the second polarization direction of the AAS; the beam in the first polarization direction has a first downtilt angle, and the beam in the second polarization direction has a second downtilt angle.

In this mode, in order to make full use of the beam for data transmission, the base station performs data transmission with the fifth UE by using the first beam and the second beam to enhance the signal strength of the fifth UE. The process is as follows:

The base station performs precoding processing on the data of the fifth UE according to the fifth equivalent precoding matrix, where the fifth equivalent precoding matrix is the fifth precoding matrix and the set third weight matrix Multiplying the obtained matrix, the fifth precoding matrix is a precoding matrix of rank 2 in the codebook set;

The base station maps the pre-coded data to the first beam and the second beam for transmission.

Among them, one possible implementation form of the third weighting matrix is:

Based on the implementation form of the foregoing third weighting matrix, if the fifth precoding matrix is a precoding matrix with a PMI of 2 in the codebook set, the fifth equivalent precoding matrix is specifically:

According to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on beam 0 and beam 1; correspondingly, UEs located within the coverage of beam 0 and beam 1 can be considered to be measured using PMI2.

If the fifth precoding matrix is a precoding matrix with a PMI of 8 in the codebook set, the fifth equivalent precoding matrix is specifically:

According to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on the beam 0 and the beam 1; correspondingly, the UE located in the coverage of the beam 0 and the beam 1 can be considered to be measured by using the PMI 8.

If the first precoding matrix is a precoding matrix with a PMI of 12 in the codebook set, the fifth equivalent precoding matrix is specifically:

According to the obtained fifth equivalent precoding matrix, the data of the fifth UE is transmitted on the beam 2 and the beam 3; correspondingly, the UE located in the coverage of the beam 2 and the beam 3 can be regarded as being measured by using the PMI 8.

If the fifth precoding matrix is a precoding matrix with a PMI of 15 in the codebook set, the fifth equivalent precoding matrix is specifically:

As can be seen from the above embodiment, according to the fifth equivalent precoding matrix, not only the data of the fifth UE but also the first beam and the second beam transmission may be acquired, and the third may be acquired. The interference condition of the beam and the data on the fourth beam to the fifth UE.

In this manner, the process of performing data transmission with the sixth UE by using the third beam and the fourth beam by the base station is similar to the processing procedure of the fifth UE, as follows:

The base station performs precoding processing on the data of the sixth UE according to the sixth equivalent precoding matrix, and then maps the precoded data to the third beam and the fourth beam for transmission. The sixth equivalent precoding matrix is a matrix obtained by multiplying a sixth precoding matrix and the third weighting matrix, and the sixth precoding matrix is a precoding matrix with a rank of 2 in the codebook set.

In the embodiment of the present invention, the base station can flexibly select a four-beam transmission mode and two beam transmissions. Way to transmit data or signaling. For example, when the network load is less than the set threshold, the two-beam transmission mode is selected to transmit data or signaling to avoid the problem of wasted beam resources due to the presence of more idle beams; when the network load is greater than or equal to the set threshold, Four-beam transmission mode is selected to transmit data or signaling to reduce network load.

Based on any of the foregoing embodiments, optionally, in the embodiment of the present invention, the pre-coded data of the different UEs may be weighted by using a 90° bridge matrix, thereby implementing antennas with different polarization directions. Power sharing. Specifically, when the base station maps data of the multiple UEs to beams of different polarization directions for transmission, the specific processing procedure is as follows:

The base station performs weighting processing on the pre-coded data of the multiple UEs according to the set 90° bridge matrix, and maps the weighted processed data to beams of different polarization directions for transmission. .

Specifically, the base station performs precoding processing on the data of the multiple UEs according to the equivalent precoding matrix corresponding to the multiple UEs, so as to map data of the multiple UEs to corresponding antenna ports. On; then, according to

Performing virtual beam transformation on the pre-coded data of the multiple UEs to map data of the multiple UEs to antennas of different polarization directions; and then, according to the 90° bridge matrix, The data of the virtual beam transform processing of the plurality of UEs is subjected to a first weighting process to make the powers of the antennas of different polarization directions the same; and then, the data of the first weighting process of the plurality of UEs is subjected to power amplification processing; And performing, according to the inverse matrix of the 90° bridge matrix, performing second weighting processing on the data after the power amplification processing of the multiple UEs; and finally, performing data of the second weighting processing of the multiple UEs, respectively Map to different beams for transmission.

Wherein the 90° bridge matrix is

In an embodiment shown in FIG. 2, in order to implement power balancing and sharing of beams in different polarization directions, in an optional implementation manner, the base station performs the first according to the 90° bridge matrix. The pre-coded data of the UE is weighted, and the processed data of the first UE is mapped to the first beam for transmission; according to the 90° bridge matrix, the second UE is used. Performing weighting processing on the pre-coded data, mapping the processed data of the second UE to the second beam for transmission; according to the 90° bridge matrix, for the third UE Performing a weighting process on the pre-coded data, mapping the processed data of the third UE to the third beam for transmission; and, according to the 90° bridge matrix, to the fourth UE The pre-coded data is weighted, and the processed data of the fourth UE is mapped to the fourth beam for transmission.

It should be noted that, in the two-beam transmission mode, the data of the pre-coded data of the fifth UE and the data of the pre-coded data of the sixth UE are processed by using a 90° bridge matrix, and the foregoing The processing procedure for the first UE in the four-beam transmission mode is similar, and will not be exemplified one by one.

The processing flow of the data of the multiple UEs by the base station in the embodiment of the present invention is described in detail below with reference to FIG. 6 .

Embodiment 3 As shown in FIG. 6, the data transmission of any UE is taken as an example, wherein the data sequence of the UE is s1, and the processing procedure is as follows: the base station adopts an equivalent precoding matrix, and records for

The data sequence s1 is pre-coded to map the data sequence s1 to different antenna ports. In this embodiment, two antenna ports are taken as an example, which are denoted as p1 and p2. Then, the base station performs pre-coding processing. The data is subjected to virtual beam transformation to map the pre-coded data to antennas of different polarization directions, and different polarization directions are respectively recorded as q1 and q2, wherein the matrix used by the virtual beam transformation is

Then, the base station performs the first weighting process on the data after the virtual beam transform processing by using the set 90° bridge matrix, and the obtained sequence is recorded as

which is

Then, the base station pair

Perform power amplification processing and transform using the inverse matrix of the 90° bridge matrix, and the resulting sequence is recorded as

Finally, the base station will

Map to beam A or beam B for transmission.

Wherein, since the 90° bridge matrix is a U matrix,

then

Therefore, all precoding matrices with a rank of 2 in the codebook set are polled.

After that, the powers of the antennas with different polarization directions can be equal, that is, |v1|=|v2|, thereby achieving the purpose of power balance and sharing.

For example, the finite finite combination of c ₁₁ and c ₂₁ is traversed, and the results are shown in Table 1:

Table 1

It can be seen that the power equalization is achieved regardless of the form of the precoding matrix. Meanwhile, when the precoding matrix is [1 1] ^T and [1 -1] ^T , the power of the antennas in the two polarization directions is completely Focused on one polarization direction, and when the precoding matrix is [1 j] ^T and [1 -j] ^T , the antennas of the two polarization directions can share power, so the weighting by the bridge matrix can The power between the antennas in different polarization directions is shared.

It should be noted that, in the embodiment of the present invention, the AAS includes eight dual-polarized antennas as an example. In the embodiment of the present invention, the number of dual-polarized antennas included in the AAS is not limited, and other numbers of dual-polarized antennas are used. In the scenario of the AAS including the 16 dual-polarized antennas, the processing of the data transmission is similar to the embodiment of the present invention, and is not illustrated here.

The above method processing flow can be implemented by a software program, which can be stored in the storage medium. In the quality, 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, a data transmission apparatus is provided. As shown in FIG. 7, the apparatus includes: a selection module 71 and a processing module 72, wherein the selection module 71 and the processing Module 72 may perform the embodiment illustrated in FIG. 1, the embodiment illustrated in FIG. 2, or the method described in the embodiment illustrated in FIG. 6. The data transmission device provided by the embodiment of the present invention will be described below by taking the method described in the embodiment shown in FIG. 2 by the selection module 71 and the processing module 72 as an example. details as follows:

a selection module 71, configured to select a plurality of user equipment UEs in a cell, where the multiple UEs include a first UE, a second UE, a third UE, and a fourth UE, where the first UE is in a first beam coverage In the range, the second UE is in the second beam coverage, the third UE is in the third beam coverage, and the fourth UE is in the fourth beam coverage; the first beam and the The second beam belongs to a beam in a first polarization direction of the active antenna system AAS, and the third beam and the fourth beam belong to a beam in a second polarization direction of the AAS; the beam in the first polarization direction Having a first downtilt angle, the beam of the second polarization direction having a second downtilt angle, wherein the device covers the cell through the AAS;

The processing module 72 is configured to perform data transmission with the first UE by using the first beam, and perform data transmission with the second UE by using the second beam, by using the first beam. The three beams perform data transmission with the third UE, and perform data transmission with the fourth UE by using the fourth beam.

In a possible implementation manner, the selecting module 71 is specifically configured to:

When the cell load of the cell exceeds a load threshold, the multiple UEs are selected.

Obtaining signal strengths of the multiple UEs;

Determining, according to signal strengths of the multiple UEs, a signal strength interval to which the signal strengths of the multiple UEs belong;

Selecting, according to the correspondence between the signal strength interval and the beam coverage range, the first UE in the first beam coverage, the second UE in the second beam coverage, and the third in the third beam coverage range. The UE and the fourth UE within the fourth beam coverage.

Optionally, the apparatus provided by the embodiment of the present invention further includes: an acquiring module, configured to acquire signal strengths of the multiple UEs, for example, the acquiring module separately collects statistics, where the multiple UEs are in the first beam, the second beam, and the first The uplink RSRP (UL RSRP) value of the Sounding Reference Signal (SRS) on the three beams and the fourth beam.

Correspondingly, the selecting module 71 acquires the signal strengths of the multiple UEs by using the acquiring module, and determines, according to the signal strengths of the multiple UEs, a signal strength interval to which the signal strengths of the multiple UEs belong; Corresponding relationship between the signal strength interval and the beam coverage range, selecting the first UE in the first beam coverage, the second UE in the second beam coverage, the third UE in the third beam coverage, and the fourth beam coverage The fourth UE within.

In a possible implementation manner, the processing module 72 is specifically configured to:

Precoding the data of the first UE according to the first equivalent precoding matrix, where the first equivalent precoding matrix is a matrix obtained by multiplying the first precoding matrix by the first weighting matrix, where A precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

Mapping the pre-coded data to the first beam for transmission;

Wherein the first weighting matrix is

Performing precoding processing on the data of the second UE according to the second equivalent precoding matrix, where the second equivalent precoding matrix is a matrix obtained by multiplying the second precoding matrix by the first weighting matrix, The second precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The pre-coded data is mapped onto the second beam for transmission.

Performing precoding processing on the data of the third UE according to the third equivalent precoding matrix, where the third equivalent precoding matrix is a matrix obtained by multiplying the third precoding matrix by the first weighting matrix, The third precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The pre-coded data is mapped onto the third beam for transmission.

Performing precoding processing on the data of the fourth UE according to the fourth equivalent precoding matrix, where the fourth equivalent precoding matrix is a matrix obtained by multiplying the fourth precoding matrix by the first weighting matrix, The fourth precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The pre-coded data is mapped onto the fourth beam for transmission.

And performing weighting processing on the pre-coded data of the first UE according to the set 90° bridge matrix, and mapping the processed data of the first UE to the first beam for transmission; And performing weighting processing on the pre-coded data of the second UE according to the 90° bridge matrix, and mapping the processed data of the second UE to the second beam for transmission; The 90° bridge matrix performs weighting processing on the pre-coded data of the third UE, and maps the processed data of the third UE to the third beam for transmission; The 90° bridge matrix performs weighting processing on the pre-coded data of the fourth UE, and maps the processed data of the fourth UE to the fourth beam for transmission.

For details of the 90° bridge matrix in this embodiment, refer to the related description in the second embodiment, and details are not described herein again.

Based on the same inventive concept, in a fifth embodiment of the present invention, a base station is provided, including the apparatus described in the embodiment shown in FIG.

A base station (e.g., an access point) in this embodiment may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), this application is not limited.

The structure and processing manner of the base station provided by the embodiment of the present invention are described below in conjunction with the preferred hardware structure. As shown in FIG. 8, in a fifth embodiment of the present invention, a base station is provided, including a transceiver 81, and at least one processor 82 connected to the transceiver 81, wherein:

While the base station is running, the processor 82 reads the program in the memory 83 and performs the following process:

Selecting a plurality of user equipment UEs in the cell, where the multiple UEs include a first UE, a second UE, a third UE, and a fourth UE, where the first UE is in a first beam coverage range, where the The second UE is in the second beam coverage, the third UE is in the third beam coverage, and the fourth UE is in the fourth beam coverage; the first beam and the second beam belong to a beam in a first polarization direction of the source antenna system AAS, the third beam and the fourth beam belong to a beam in a second polarization direction of the AAS; the beam in the first polarization direction has a first downtilt angle, The beam in the second polarization direction has a second downtilt angle, wherein the device covers the cell through the AAS;

Data transmission with the first UE by using the first beam, data transmission with the second UE by using the second beam, and the third beam and the first Transmitting, by the third UE, data transmission, and performing data transmission with the fourth UE by using the fourth beam;

The transceiver 81 is configured to receive and transmit data under the control of the processor 82.

Here, in FIG. 8, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 82 and various circuits of memory represented by memory 83. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 81 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium. The processor 82 is responsible for managing the bus architecture and general processing, and the memory 83 can store data used by the processor 82 in performing the operations.

In a possible implementation manner, when the processor selects multiple UEs in the cell, the specific execution is:

Obtaining signal strengths of the multiple UEs;

Selecting, according to the correspondence between the signal strength interval and the beam coverage range, the first UE in the first beam coverage, the second UE in the second beam coverage, the third UE in the third beam coverage, and the fourth beam coverage. The fourth UE in the range.

In a possible implementation, when the processor performs data transmission with the first UE by using the first beam, the processor specifically performs:

Mapping the pre-coded data to the first beam for transmission;

Wherein the first weighting matrix is

In a possible implementation, when the processor performs data transmission with the second UE by using the second beam, the processor specifically performs:

The pre-coded data is mapped onto the second beam for transmission.

In a possible implementation, when the processor performs data transmission with the third UE by using the third beam, the processor specifically performs:

The pre-coded data is mapped onto the third beam for transmission.

In a possible implementation, when the processor performs data transmission with the fourth UE by using the fourth beam, the processor specifically performs:

The pre-coded data is mapped onto the fourth beam for transmission.

In a possible implementation manner, the processor performs data transmission with the first UE by using the first beam, and performs data transmission with the second UE by using the second beam, on the same time-frequency resource. Performing data transmission with the third UE by using the third beam, and performing data transmission with the fourth UE by using the fourth beam, specifically performing:

Those skilled in the art will appreciate that embodiments of the present invention can 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 a combination of software and hardware. Moreover, the invention can 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, etc.) including computer usable program code.

The present invention is directed to a method, apparatus (system), and computer program according to an embodiment of the present invention. The flow chart and/or block diagram of the product is described. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A data transmission method, characterized in that the method comprises:

The base station selects a plurality of user equipment UEs in the cell, where the multiple UEs include a first UE, a second UE, a third UE, and a fourth UE, where the first UE is in a first beam coverage range, The second UE is in the second beam coverage, the third UE is in the third beam coverage, and the fourth UE is in the fourth beam coverage; the first beam and the second beam belong to a beam of the first polarization direction of the active antenna system AAS, the third beam and the fourth beam belong to a beam of the second polarization direction of the AAS; the beam of the first polarization direction has a first downtilt angle The second polarization direction beam has a second downtilt angle, wherein the base station covers the cell by using the AAS;

The base station performs data transmission with the first UE by using the first beam, and performs data transmission with the second UE by using the second beam on the same time-frequency resource, and the third beam is used to The third UE performs data transmission, and performs data transmission with the fourth UE by using the fourth beam.
The method according to claim 1, wherein the base station selects a plurality of UEs, including:

When the cell load of the cell exceeds a load threshold, the base station selects the multiple UEs.
The method according to claim 1 or 2, wherein the base station selects a plurality of UEs, including:

The base station acquires signal strengths of the multiple UEs;

Determining, by the base station, a signal strength interval to which the signal strengths of the multiple UEs belong according to signal strengths of the multiple UEs;

The base station selects, according to the correspondence between the signal strength interval and the beam coverage range, the first UE in the first beam coverage, the second UE in the second beam coverage, the third UE in the third beam coverage, and the third The fourth UE within the coverage of the four beams.
The method according to any one of claims 1 to 3, wherein said base station passes said The first beam and the first UE perform data transmission, including:

The base station performs precoding processing on the data of the first UE according to the first equivalent precoding matrix, where the first equivalent precoding matrix is a matrix obtained by multiplying the first precoding matrix by the first weighting matrix, The first precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The base station maps the pre-coded data to the first beam for transmission;

Wherein the first weighting matrix is
The method according to claim 4, wherein the base station performs data transmission with the second UE by using the second beam, including:

The base station performs precoding processing on the data of the second UE according to the second equivalent precoding matrix, where the second equivalent precoding matrix is obtained by multiplying the second precoding matrix by the first weighting matrix. a matrix, the second precoding matrix being a precoding matrix of rank 2 in the codebook set;

The base station maps the pre-coded data to the second beam for transmission.
The method according to claim 5, wherein the base station performs data transmission with the third UE by using the third beam, including:

The base station performs precoding processing on the data of the third UE according to the third equivalent precoding matrix, where the third equivalent precoding matrix is obtained by multiplying the third precoding matrix by the first weighting matrix. a matrix, the third precoding matrix being a precoding matrix of rank 2 in the codebook set;

The base station maps the pre-coded data to the third beam for transmission.
The method according to claim 6, wherein the base station performs data transmission with the fourth UE by using the fourth beam, including:

The base station performs precoding processing on the data of the fourth UE according to the fourth equivalent precoding matrix, where the fourth equivalent precoding matrix is obtained by multiplying the fourth precoding matrix by the first weighting matrix. a matrix, the fourth precoding matrix being a precoding matrix of rank 2 in the codebook set;

The base station maps the pre-coded data to the fourth beam for transmission.
The method according to any one of claims 4 to 7, wherein the base station performs data transmission with the first UE by using the first beam, and performs the data transmission with the second UE by using the second beam. Data transmission, data transmission with the third UE by using the third beam, and data transmission with the fourth UE by using the fourth beam, including:

The base station performs weighting processing on the pre-coded data of the first UE according to the set 90° bridge matrix, and maps the processed data of the first UE to the first beam. Transmitting, performing data processing on the pre-coded data of the second UE according to the 90° bridge matrix, and mapping the processed data of the second UE to the second beam. Transmitting, according to the 90° bridge matrix, performing weighting processing on the pre-coded data of the third UE, and mapping the processed data of the third UE to the third beam for transmission And performing weighting processing on the pre-coded data of the fourth UE according to the 90° bridge matrix, and mapping the processed data of the fourth UE to the fourth beam for transmission .
The method of claim 8 wherein said 90° bridge matrix is
A data transmission device, characterized in that the device comprises:

a selection module, configured to select a plurality of user equipment UEs in a cell, where the multiple UEs include a first UE, a second UE, a third UE, and a fourth UE, where the first UE is in a first beam coverage range The second UE is in a second beam coverage, the third UE is in a third beam coverage, and the fourth UE is in a fourth beam coverage; the first beam and the first The second beam belongs to a beam in a first polarization direction of the active antenna system AAS, and the third beam and the fourth beam belong to a beam in a second polarization direction of the AAS; the beam in the first polarization direction has a beam a first downtilt angle, the beam in the second polarization direction having a second downtilt angle, wherein the device covers the cell through the AAS;

a processing module, configured to perform data transmission with the first UE by using the first beam, and perform data transmission with the second UE by using the second beam, by using the third beam The beam performs data transmission with the third UE, and performs data transmission with the fourth UE by using the fourth beam.
The device according to claim 10, wherein the selection module is specifically configured to:

When the cell load of the cell exceeds a load threshold, the multiple UEs are selected.
The device according to claim 10 or 11, wherein the selection module is specifically configured to:

Obtaining signal strengths of the multiple UEs;

Determining, according to signal strengths of the multiple UEs, a signal strength interval to which the signal strengths of the multiple UEs belong;

Selecting, according to the correspondence between the signal strength interval and the beam coverage range, the first UE in the first beam coverage, the second UE in the second beam coverage, the third UE in the third beam coverage, and the fourth beam coverage. The fourth UE in the range.
The device according to any one of claims 10 to 12, wherein the processing module is specifically configured to:

Precoding the data of the first UE according to the first equivalent precoding matrix, where the first equivalent precoding matrix is a matrix obtained by multiplying the first precoding matrix by the first weighting matrix, where A precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

Mapping the pre-coded data to the first beam for transmission;

Wherein the first weighting matrix is
The device according to claim 13, wherein the processing module is specifically configured to:

Performing precoding processing on the data of the second UE according to the second equivalent precoding matrix, where the second equivalent precoding matrix is a matrix obtained by multiplying the second precoding matrix by the first weighting matrix, The second precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The pre-coded data is mapped onto the second beam for transmission.
The device according to claim 14, wherein the processing module is specifically configured to:

Performing precoding processing on data of the third UE according to a third equivalent precoding matrix, where 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 the codebook set;

The pre-coded data is mapped onto the third beam for transmission.
The device according to claim 15, wherein the processing module is specifically configured to:

Performing precoding processing on the data of the fourth UE according to the fourth equivalent precoding matrix, where the fourth equivalent precoding matrix is a matrix obtained by multiplying the fourth precoding matrix by the first weighting matrix, The fourth precoding matrix is a precoding matrix with a rank of 2 in the codebook set;

The pre-coded data is mapped onto the fourth beam for transmission.
The device according to any one of claims 13 to 16, wherein the processing module is specifically configured to:

And performing weighting processing on the pre-coded data of the first UE according to the set 90° bridge matrix, and mapping the processed data of the first UE to the first beam for transmission; And performing weighting processing on the pre-coded data of the second UE according to the 90° bridge matrix, and mapping the processed data of the second UE to the second beam for transmission; The 90° bridge matrix performs weighting processing on the pre-coded data of the third UE, and maps the processed data of the third UE to the third beam for transmission; The 90° bridge matrix performs weighting processing on the pre-coded data of the fourth UE, and maps the processed data of the fourth UE to the fourth beam for transmission.
The apparatus of claim 17 wherein said 90° bridge matrix is