WO2019141148A1

WO2019141148A1 - Scheduling method and device, large-scale multiple-antenna system, and storage medium

Info

Publication number: WO2019141148A1
Application number: PCT/CN2019/071600
Authority: WO
Inventors: 张泽中; 王锐; 李洋; 周泽华; 李风从; 郝祁
Original assignee: 南方科技大学
Priority date: 2018-01-16
Filing date: 2019-01-14
Publication date: 2019-07-25
Also published as: CN108199989B; CN108199989A

Abstract

A scheduling method, a scheduling device (10), a large-scale multiple-antenna system (1000), and a computer readable storage medium (8000). The scheduling method comprises: classifying, according to a change of several previous frames of channel information for communication between a terminal (200) and a base station (100), the terminal (200) as a high-speed moving terminal or a low-speed moving terminal (S12); and allocating, according to positions of multiple base stations (100), a downlink delay to a low-speed moving terminal in a cell (800), such that different downlink delays are allocated to low-speed moving terminals in adjacent cells (800), wherein the downlink delay is the number of frames between completion of uplink pilot transmission and a start of uplink data transmission of the low-speed moving terminal, and a downlink delay of a high-speed moving terminal is 0 (S14).

Description

Scheduling method and device, large-scale multi-antenna system and storage medium

Priority information

Priority is claimed on Japanese Patent Application No. 20181003928, filed on Jan. 16, 2008, the disclosure of which is hereby incorporated by reference.

Technical field

The present application relates to the field of communications technologies, and in particular, to a scheduling method and apparatus, a large-scale multi-antenna system, and a computer readable storage medium.

Background technique

In the case where the channel information is completely known, the large-scale multi-antenna system can greatly suppress the interference between users, improve the user's signal to interference and noise ratio, thereby increasing the individual user transmission rate; on the other hand, the large-scale multi-antenna system It can also serve multiple users simultaneously, further increasing the throughput of the entire large-scale multi-antenna system.

The user scheduling method in the large-scale multi-antenna system of the related art estimates the channel information by using pilots, and by assigning orthogonal pilots to different users when the pilot length is ideal (can grow indefinitely) Reduce the error of channel estimation, thereby improving the transmission performance of the system. However, the increase of the pilot length inevitably leads to the reduction of the uplink and downlink data transmission time in a single frame, so the length of the pilot is strictly controlled in systems such as LTE. It is because of the limitation of the pilot length that the same pilot sequence is multiplexed in similar cells, which causes the base station to be affected by the terminal that multiplexes the same pilot, thereby causing pilot pollution problems, and the pilot pollution problem will be The channel information estimated by the pilot has a large error, thereby affecting the transmission performance of the large-scale multi-antenna system.

Summary of the invention

Embodiments of the present application provide a scheduling method and apparatus, a large-scale multi-antenna system, and a computer readable storage medium.

The scheduling method of the embodiment of the present application is for controlling a large-scale multi-antenna system, where the large-scale multi-antenna system includes a plurality of base stations, each of the base stations covering one cell for the terminals in the cell to pass the large-scale The multi-antenna system performs communication, the scheduling method comprising the steps of: dividing the terminal into a high-speed motion terminal and a low-speed motion terminal according to a change in channel information in which the terminal communicates with the base station in a previous number of frames; Configuring a downlink delay for the low-speed mobile terminal of the cell to allocate different downlink delays to the low-speed mobile terminal of the neighboring cell, where the downlink delay is The low-speed motion terminal performs a difference between the number of frames after the completion of the pilot uplink transmission and the start of the data uplink transmission, and the downlink delay of the high-speed motion terminal is 0.

In some embodiments, the step of dividing the terminal into a high-speed mobile terminal and a low-speed mobile terminal according to a change in channel information in which the terminal communicates with the base station according to a previous frame includes the following steps: Determining the time-varying parameter of the terminal; determining whether the time-varying parameter is greater than a predetermined threshold; determining that the terminal is the low-speed motion when the time-varying parameter is greater than the predetermined threshold a terminal; and determining that the terminal is the high speed mobile terminal when the time varying parameter is less than or equal to the predetermined threshold.

In some embodiments, the scheduling method further includes the step of: re-allocating the downlink delay to the cell after the predetermined time according to the downlink delay of the cell, and minimizing the downlink delay. The downlink delay of the cell becomes the maximum downlink delay and the number of frames of the downlink delay of the remaining cells is decreased by one.

In some embodiments, the scheduling method further includes the steps of: selecting, by the terminal requesting service, the pilot uplink transmission and performing channel estimation according to the pilot to obtain the channel information; The downlink delay and the channel information respectively perform data transmission on the high speed motion terminal and the low speed motion terminal.

In some embodiments, the step of the selection requesting service performing the pilot uplink transmission and performing channel estimation according to the pilot to obtain the channel information comprises the step of selecting all the services that request service. Deriving the pilot uplink transmission by the high speed motion terminal and performing the channel estimation according to the pilot; and dividing the low speed motion terminal that requests all services into n equal parts and performing the pilot uplink in consecutive n frames The channel estimation is transmitted and performed according to the pilot such that the low speed motion terminals performing the channel estimation in consecutive n frames are different from each other.

In some embodiments, the channel estimate is determined by a minimum mean square error estimate to determine the channel information.

In some embodiments, the step of performing data transmission on the high speed mobile terminal and the low speed motion terminal respectively according to the downlink delay and the channel information comprises the following steps: the same as the channel estimation Performing the data transmission on the high-speed mobile terminal in a frame, and performing the data transmission on the low-speed mobile terminal in an mth frame after the channel estimation is completed, where the m-th frame and the cell are The downlink delay corresponds.

The scheduling apparatus of the embodiment of the present application is configured to control a large-scale multi-antenna system, where the large-scale multi-antenna system includes a plurality of base stations, each of the base stations covering one cell for the terminals in the cell to pass the large-scale The multi-antenna system communicates, and the scheduling device includes a partitioning module and an allocating module. The dividing module is configured to divide the terminal into a high-speed mobile terminal and a low-speed mobile terminal according to a change of channel information that the terminal communicates with the base station in a previous frame; the allocation module is configured to use, according to the multiple base stations Assigning a downlink delay to the low-speed mobile terminal of the cell, so that the low-speed mobile terminal of the adjacent cell allocates different downlink delays, wherein the downlink delay is the low speed The number of frames between the mobile terminal and the start data uplink transmission after the completion of the pilot uplink transmission, and the downlink delay of the high-speed motion terminal is 0.

In some embodiments, the partitioning module includes a first determining unit, a determining unit, a second determining unit, and a third determining unit. The first determining unit is configured to determine a time varying parameter of the terminal according to the change of the channel information of the previous frame; the determining unit is configured to determine whether the time varying parameter is greater than a predetermined threshold; The determining unit is configured to determine that the terminal is the low speed motion terminal when the time varying parameter is greater than the predetermined threshold; and the third determining unit is configured to use the time varying parameter to be less than or equal to the predetermined threshold And determining that the terminal is the high speed mobile terminal.

In some embodiments, the scheduling device further includes a second allocation module. The second allocation module is configured to re-allocate the downlink delay to the cell after the predetermined time according to the downlink delay of the cell, and enable the downlink time of the cell with the downlink delay to be the smallest The delay is changed to the maximum downlink delay and the number of frames of the downlink delay of the remaining cells is decreased by one.

In some embodiments, the scheduling device further includes a processing module and a transmission module. The processing module is configured to select the terminal that requests the service to perform the pilot uplink transmission, and perform channel estimation according to the pilot to obtain the channel information; and the transmission module is configured to use the downlink delay and The channel information performs data transmission on the high speed motion terminal and the low speed motion terminal, respectively.

In some embodiments, the processing module includes a first processing unit and a second processing unit. The first processing unit is configured to select all high speed mobile terminals that request service to perform the pilot uplink transmission and perform the channel estimation according to the pilot; and the second processing unit is configured to divide all request services. The low speed motion terminal is n equal parts and performs the pilot uplink transmission in consecutive n frames and performs the channel estimation according to the pilot such that the low speed of the channel estimation is performed in consecutive n frames The sports terminals are different from each other.

In some embodiments, the transmission module includes a transmission unit. The transmitting unit is configured to perform the data transmission on the high-speed mobile terminal in the same frame as the channel estimation, and perform the data on the low-speed mobile terminal in an mth frame after the channel estimation is completed. Transmission, the mth frame corresponds to the downlink delay of the cell.

A large-scale multi-antenna system of an embodiment of the present application includes a base station, a terminal, one or more processors, a memory, and one or more programs. Wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the program comprising instructions for performing the scheduling method of any of the embodiments described above.

A computer readable storage medium of an embodiment of the present application includes a computer program for use in conjunction with a large scale multi-antenna system, the computer program being executable by a processor to perform the scheduling method of any of the above embodiments.

The scheduling method and apparatus of the embodiments of the present application, the large-scale multi-antenna system, and the computer-readable storage medium divide the terminal into a high-speed motion terminal and a low-speed motion terminal by changing channel information in which the terminal of the previous frame communicates with the base station. The downlink delay of the high-speed motion terminal is set to 0 to avoid the channel estimation error caused by the Doppler effect of the high-speed motion terminal. The data transmission of the low speed mobile terminal is staggered with the pilot uplink transmission. Thus, since the location of the low-speed mobile terminal is substantially fixed within a few frames, the channel information does not change relatively, and the data transmission using the channel information before the digital frame does not significantly affect the transmission performance of the low-speed mobile terminal. In addition, different downlink delays are allocated to cells of multiple base stations, so that even if there is pilot multiplexing in the low-speed mobile terminal that performs channel estimation in different cells at the same time, different downlink delays are allocated between the cells, so that the data is transmitted. The interference is greatly reduced, thereby greatly suppressing the degradation of the transmission performance caused by the pilot pollution, and finally the transmission performance of the large-scale multi-antenna system is improved.

Additional aspects and advantages of the embodiments of the present invention will be set forth in part in the description which follows

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic flowchart of a scheduling method according to an embodiment of the present application;

2 is a schematic block diagram of a scheduling apparatus according to an embodiment of the present application;

3 is a schematic diagram of a large-scale multi-antenna system according to an embodiment of the present application;

4 is a schematic diagram of a large-scale multi-antenna system according to another embodiment of the present application;

FIG. 5 is a schematic flowchart of a scheduling method according to another embodiment of the present application; FIG.

6 is a schematic block diagram of a partitioning module according to an embodiment of the present application;

7 is a schematic flowchart of a scheduling method according to still another embodiment of the present application;

8 is a block diagram of a scheduling apparatus according to another embodiment of the present application;

9 is a schematic flowchart of a scheduling method according to still another embodiment of the present application;

FIG. 10 is a schematic block diagram of a scheduling apparatus according to still another embodiment of the present application; FIG.

11 is a schematic flowchart of a scheduling method according to still another embodiment of the present application;

12 is a schematic block diagram of a processing module according to an embodiment of the present application;

13 is a schematic flowchart of a scheduling method according to still another embodiment of the present application;

FIG. 14 is a schematic block diagram of a scheduling apparatus according to still another embodiment of the present application; FIG.

15 is a block diagram of a large-scale multi-antenna system according to an embodiment of the present application; and

Figure 16 is a schematic illustration of the connection of a large-scale multi-antenna system to a computer readable storage medium in accordance with an embodiment of the present application.

Detailed ways

The embodiments of the present application are further described below in conjunction with the accompanying drawings. The same or similar reference numerals in the drawings denote the same or similar elements or elements having the same or similar functions. In addition, the embodiments of the present application, which are described below with reference to the accompanying drawings, are merely illustrative of the embodiments of the present invention, and are not to be construed as limiting.

Referring to FIG. 1 and FIG. 3, a scheduling method according to an embodiment of the present application is used to control a large-scale multi-antenna system 1000. The large-scale multi-antenna system 1000 includes a plurality of base stations 100, and each base station 100 covers one cell 800 for a cell 800. The terminal 200 within the communication communicates through the large-scale multi-antenna system 1000, and the scheduling method includes the following steps:

S12: dividing the terminal 200 into a high-speed motion terminal and a low-speed motion terminal according to changes in channel information that the terminal 200 communicates with the base station 100 in the previous frame; and

S14: Allocating a downlink delay to the low-speed mobile terminal of the cell 800 according to the location of the multiple base stations 100, so that the low-speed mobile terminal of the adjacent cell 800 allocates different downlink delays, where the downlink delay is a low-speed mobile terminal for piloting. The number of frames that differs from the start of data uplink transmission after the uplink transmission is completed, and the downlink delay of the high-speed motion terminal is 0.

Referring to FIG. 2 and FIG. 3, the scheduling apparatus 10 of the embodiment of the present application is configured to control a large-scale multi-antenna system 1000. The large-scale multi-antenna system 1000 includes a plurality of base stations 100, and each base station 100 covers one cell 800 for a cell. The terminal 200 within 800 communicates through the large-scale multi-antenna system 1000, and the scheduling device 10 includes a partitioning module 12 and a first distribution module 14. The dividing module 12 is configured to divide the terminal 200 into a high-speed mobile terminal and a low-speed mobile terminal according to changes in channel information that the terminal 200 communicates with the base station 100 in the previous frame. The first allocation module 14 is configured to allocate a downlink delay to the low-speed mobile terminal of the cell 800 according to the location of the multiple base stations 100, so that the low-speed mobile terminal of the adjacent cell 800 allocates different downlink delays, where the downlink of the low-speed mobile terminal The delay is the number of frames between the low-speed mobile terminal and the start of the data uplink transmission after the completion of the pilot uplink transmission, and the downlink delay of the high-speed motion terminal is 0.

That is to say, the scheduling method of the embodiment of the present application can be implemented by the scheduling apparatus 10 of the embodiment of the present application, wherein the step S12 can be implemented by the dividing module 12. Step S14 can be implemented by the first distribution module 14.

The scheduling method, the scheduling apparatus 10, and the large-scale multi-antenna system 1000 of the embodiment of the present application divide the terminal 200 into a high-speed motion terminal and a low-speed motion terminal by changing channel information in which the terminal 200 of the previous frame communicates with the base station 100. The downlink delay of the high-speed motion terminal is set to 0 to avoid the channel estimation error caused by the Doppler effect of the high-speed motion terminal. The data transmission of the low speed mobile terminal is staggered with the pilot uplink transmission. Thus, since the position of the low-speed mobile terminal is substantially fixed within a few frames, the channel information does not change relatively, and the data transmission using the channel information before the number of frames does not significantly affect the transmission performance of the low-speed mobile terminal. In addition, different downlink delays are allocated to the cells 800 of the multiple neighboring base stations 100, so that the low-speed mobile terminals that perform channel estimation simultaneously in different cells 800 have different downlink delays allocated by the neighboring cells 800 even if there is pilot multiplexing. The interference caused by data transmission is reduced, thereby suppressing pilot pollution, and finally the transmission performance of the large-scale multi-antenna system 1000 is improved.

Specifically, a large-scale multi-antenna system 1000, as shown in FIG. 4, the base station 100 of each cell 800 first divides all the terminals 200 requesting service into high-speed motion terminals according to the characteristics that the faster the channel 200 moves faster, the faster the channel changes. The low-speed motion terminal has a downlink delay of 0 for the high-speed mobile terminal, and then allocates different downlink delays for the low-speed mobile terminals of the neighboring cell 800. The non-adjacent cell 800 using the same padding pattern in FIG. 4 is assigned the same A downlink delay, for example, where the downlink delay of the cell 1, the cell 6, the cell 7 and the cell 12 is 1 frame, and the downlink delay of the cell 2, the cell 4, the cell 8 and the cell 10 is 2 frames, and the cell 3 and the cell 5. The downlink delay of the cell 9 and the cell 11 is 3 frames. As such, all of the neighboring cells 800 are assigned different downlink delays. For example, when cell 1, cell 2, and cell 4 are adjacent to each other, when low-speed mobile terminals in the three cells 800 perform channel estimation at the same time, channel estimation may occur due to possible pilot multiplexing, usually, channel estimation. The result is

Where ΔH is the estimation error, the following line precoding is taken as an example, and the downlink precoding is

Then the signal obtained from the downlink is

among them

The calculation involves ΔH(ΔH) ^H . If the terminal 200 that multiplexes the pilot performs channel estimation and performs data transmission at the same time, the result of ΔH(ΔH) ^H is all the coherent term product, similar to

Among them, a is the channel estimation error, which increases the error of the downlink signal and ultimately affects the transmission performance of the low-speed motion terminal. It should be noted. The product of the coherent term means, for example, a channel row vector h with a length of L. Each term in the vector obeys a Gaussian distribution with a variance of 1. This vector is multiplied by its own conjugate transpose h ^H , which is large. The result is L; but if this vector is multiplied by an irrelevant column vector g ^H , the result will be

Is the set of all channel estimation error row vectors in cell 800, and L is the number of terminals. So the result of ΔH multiplied by its own conjugate transpose ΔH ^H is approximately a diagonal matrix, and the elements on the diagonal are the products of the coherent (same) vectors. After the downlink delay is allocated to the neighboring cell 800, the downlink delay of the cell 1 is 1 frame, the downlink delay of the cell 2 is 2 frames, and the downlink delay of the cell 4 is 3 frames, and the three cells are in the three cells. After the terminal 200 in 800 performs channel estimation at the same time, the pilot multiplexed terminal 200 generates a similar or identical channel estimation error ΔH, after which the high-speed mobile terminal performs data transmission in the current frame, and the low-speed motion terminal of the cell 1 is in one frame. After the data transmission, the low-speed mobile terminal of the cell 2 performs data transmission after 2 frames, and the low-speed mobile terminal of the cell 4 performs data transmission after 3 frames, so that the low-speed mobile terminals of different cells 800 performing channel estimation simultaneously are allocated differently. The downlink delay is different from the downlink delay of the high-speed mobile terminal. That is to say, when the high-speed mobile terminal performs data transmission in the current frame, the low-speed mobile terminals of different cells 800 that simultaneously perform channel estimation are respectively after different downlink delays. Data transmission is performed, such that high-speed mobile terminals are only interfered by high-speed mobile terminals of different cells 800, and the number of high-speed mobile terminals is relatively small. Therefore, even while the channel estimation after each other simultaneous data transfers, high-speed transmission performance will not have a great impact on the motion of the terminal. When the low-speed mobile terminal of the cell 1 performs data transmission after one frame, the downlink delays of the cell 2 and the cell 4 are respectively 2 frames and 3 frames, and at this time, the low-speed mobile terminals of the cell 1 and the cell 4 are simultaneously performed with the low-speed mobile terminal of the cell 1. The low-speed motion terminal of the channel estimation does not perform data transmission, and the low-speed motion terminal in the cell 2 and the cell 4 that performs channel estimation simultaneously with the low-speed mobile terminal of the cell 1 includes: a low-speed motion terminal that uses the same or the same pilot as the cell 1, and A low-speed mobile terminal that uses an unrelated pilot with the cell 1, wherein whether the low-speed mobile terminal in the cell 2 and the cell 4 that uses the unrelated pilot in the cell 1 performs data transmission does not transmit data to the low-speed mobile terminal of the cell 1 The impact occurs, and the low-speed mobile terminals in the cell 2 and the cell 4 that may affect the data transmission of the low-speed mobile terminal of the cell 1 that are related to the same or the same pilot as the cell 1 do not perform data transmission, but are not simultaneously multiplexed. The pilot's low-speed mobile terminal or high-speed mobile terminal is performing data transmission, so that the low-speed mobile terminal of the cell 1 transmits signals during data transmission. No error from the received multiplexed low speed terminal while the same pilot, the channel estimation error will differ, the result ^{^{ΔH n + t (ΔH n)}} H in the presence of irrelevant items, similar to

Among them, a and b are channel estimation errors, so the result of the final error will be much smaller than the error of the above-mentioned coherent term product. Similarly, both the uplink data decoding and the downlink data precoding are related to the result of the channel estimation, and the reduction of the channel estimation error can reduce the influence of the pilot pollution caused by the uplink data decoding and the downlink data precoding, thereby improving the terminal 200 data. The performance of the transmission.

It should be noted that in order to ensure the transmission performance of a small number of high-speed mobile terminals, the downlink delay allocated for low-speed mobile terminals should be greater than or equal to 1 frame. In this way, the low-speed motion terminals that perform channel estimation simultaneously with the high-speed motion terminal perform data transmission at least after one frame, so that the pilot pollution of the high-speed motion terminal is greatly reduced, thereby improving the transmission performance of the high-speed motion terminal.

The terminal 200 of the embodiment of the present application includes, but is not limited to, a smart phone, a personal computer (PC), a tablet computer (PAD), a personal digital assistant (PDA), and a mobile internet device (MID). Wait.

Usually, the structure of one frame is "upstream pilot-uplink data-downlink data" (TDD system (Time Division Duplexing (TDD)) or "uplink pilot-uplink data-downlink pilot-downlink data" (non-TDD system).

The embodiment of the present application adopts a time division duplex TDD system, that is, the channel in one frame is considered to be invariant, and the channel information obtained by the uplink channel estimation can be directly used in downlink precoding. Channel estimation is performed after the pilot transmission ends, and then the uplink data stream is decoded using the channel estimation result, and the downlink data transmission is precoded to obtain a higher channel gain.

The base station 100 (i.e., the public mobile communication base station) is a form of a radio station, and refers to a radio transceiver station that performs information transmission with a mobile telephone terminal through a mobile communication switching center in a certain radio signal coverage area. Cell 800 is the area covered by the radio signal of base station 100.

Referring to FIG. 5, in some embodiments, step S12 includes the following steps:

S122: Determine a time-varying parameter of the terminal 200 according to a change of channel information of the previous frames;

S124: Determine whether the time varying parameter is greater than a predetermined threshold;

S126: determining that the terminal 200 is a low-speed motion terminal when the time-varying parameter is greater than a predetermined threshold; and

S128: Determine that the terminal 200 is a high-speed motion terminal when the time-varying parameter is less than or equal to a predetermined threshold.

Referring to FIG. 6 , in some embodiments, the partitioning module includes a first determining unit 122, a determining unit 124, a second determining unit 126, and a third determining unit 128. The first determining unit 122 is configured to determine the time varying parameter of the terminal 200 according to the change of the channel information of the previous frames. The determining unit 124 is configured to determine whether the time varying parameter is greater than a predetermined threshold. The second determining unit 126 is configured to determine that the terminal 200 is a low speed mobile terminal when the time varying parameter is greater than a predetermined threshold. The third determining unit 128 is configured to determine that the terminal 200 is a high-speed mobile terminal when the time-varying parameter is less than or equal to a predetermined threshold.

That is to say, step S122 can be implemented by the first determining unit 122. Step S124 can be implemented by the determining unit 124. Step S126 can be implemented by the second determining unit 126. Step 128 can be implemented by third determining unit 128.

In this way, according to the feature that the channel information of the high-speed motion terminal changes greatly, the time-varying parameter is determined by the change of the channel information that the terminal 200 communicates with the base station 800 in the previous frames, and the high-speed motion terminal and the low-speed motion in the terminal 200 are determined according to the time-varying parameter. terminal.

Specifically, it is assumed that h ⁿ is the channel information of the nth frame of the base station 100 to a certain terminal 200, and the channel model in which the delay is introduced is

∈[0,1], g ⁿ⁺¹ is the channel change amount of n+1 frames, and the base station 100 can estimate the time-varying parameter α value for each terminal 200 according to the change of the channel information of the previous multi-frame, The closer α is to 1, the slower the channel change, and the closer α is to 0, the faster the channel changes (the value of the time-varying parameter is nonlinearly related to the moving speed of the terminal 200). In the embodiment of the present application, α _T = 0.9881 (when the terminal 200 moves at a speed of about 3 m/s) is a predetermined threshold, and when the time-varying parameter α>α _T of the terminal 200 determines that the terminal 200 is a low-speed mobile terminal, at the terminal 200. The time-varying parameter α ≤ α _T is determined as a high-speed motion terminal. The terminal 200 can be accurately divided into a high speed motion terminal and a low speed motion terminal.

Referring to FIG. 7, in some embodiments, the scheduling method further includes the following steps:

S16: Reassign the downlink delay to the cell 800 after the predetermined time according to the downlink delay of the cell 800, and change the downlink delay of the cell 800 with the smallest downlink delay to the maximum downlink delay and the downlink delay of the remaining cell 800. The number of frames is decremented by one.

Referring to FIG. 8, the scheduling device 10 further includes a second allocation module 16 in some embodiments. The second allocation module 16 is configured to re-deploy the downlink delay to the cell 800 after the predetermined time according to the downlink delay of the cell 800, and reduce the downlink delay of the cell 800 with the smallest downlink delay to the maximum downlink delay and the remaining cells. The number of frames of the downlink delay of 800 is decremented by one.

That is to say, step S16 can be implemented by the second allocation module 16.

In this way, by cyclically allocating the number of downlink delay frames of the cell 800, the average downlink delay of the different cells 800 is consistent, which ensures the fairness of signal transmission of different cells 800.

Specifically, as shown in FIG. 4, the basic time unit of the wireless communication is Ts=32.55 ns. In the TDD, the length of each wireless system frame is Tf=307200*Ts=10 ms, for example, the predetermined time is set to 1 S, that is, 1000 ms. That is, the downlink delay is re-allocated after 100 frames, for example, the downlink delay of the cell 1, the cell 6, the cell 7 and the cell 12 is 1 frame, and the downlink delay of the cell 2, the cell 4, the cell 8 and the cell 10 is 2 The downlink delay of the frame, cell 3, cell 5, cell 9 and cell 11 is 3 frames. After 1S, the downlink delay is re-allocated. At this time, the downlink delay of cell 1, cell 6, cell 7, and cell 12 becomes 3 frames, and the downlink delay of cell 2, cell 4, cell 8, and cell 10 becomes In 1 frame, the downlink delay of cell 3, cell 5, cell 9 and cell 11 becomes 2 frames. In this way, after 1S, the downlink delay of the cell 1, the cell 6, the cell 7 and the cell 12 becomes 2 frames, and the downlink delay of the cell 2, the cell 4, the cell 8 and the cell 10 is 3 frames, and the cell 3 and the cell 5. The downlink delay of the cell 9 and the cell 11 is 1 frame. After 1S, the downlink delay of cell 1, cell 6, cell 7 and cell 12 is 1 frame, and the downlink delay of cell 2, cell 4, cell 8 and cell 10 is 2 frames, cell 3, cell 5, cell 9 and the downlink delay of the cell 11 is 3 frames, and then the downlink delay allocation state before the 3S is returned. Thus, the average delay of each cell 800 in each 3S is 2, so that the average delay is 800. The fairness of data transmission per cell 800.

Referring to FIG. 9, in some embodiments, the scheduling method further includes the following steps:

S18: Selecting the terminal 200 requesting the service to perform pilot uplink transmission and performing channel estimation according to the pilot to obtain channel information; and

S11: Perform data transmission on the high speed motion terminal and the low speed motion terminal according to the downlink delay and the channel information, respectively.

Referring to FIG. 10, in some embodiments, the scheduling device 10 further includes a processing module 18 and a transmission module 11. The processing module 18 is configured to select the terminal 200 requesting the service to perform pilot uplink transmission and perform channel estimation according to the pilot to obtain channel information. The transmission module 11 is configured to perform data transmission on the high speed motion terminal and the low speed motion terminal respectively according to the downlink delay and the channel information.

That is to say, step S18 can be implemented by the processing module 18. Step S11 can be implemented by the transmission module 11.

In this way, the base station 100 can determine the channel information according to the uplink pilot data of the terminal 200, and perform data transmission on the high speed motion terminal and the low speed motion terminal according to the downlink delay of the different cell 800 and the channel information corresponding to the terminal 200, respectively.

Referring to FIG. 11, in some embodiments, step S18 includes the following steps:

S182: Select all high-speed mobile terminals requesting service for pilot uplink transmission and perform channel estimation according to pilots; and

S184: The low-speed mobile terminals that divide all the requested services are n equal parts and perform pilot uplink transmission in consecutive n frames and perform channel estimation according to pilots such that the low-speed motion terminals that perform channel estimation in consecutive n frames are different from each other.

Referring to FIG. 12, in some embodiments, the processing module 18 includes a first processing unit 182 and a second processing unit 184. The first processing unit 182 is configured to select all high speed mobile terminals requesting service for pilot uplink transmission and perform channel estimation according to pilots. The second processing unit 184 is configured to divide all low-speed mobile terminals requesting service into n equal parts and perform pilot uplink transmission in consecutive n frames and perform channel estimation according to pilots to enable low-speed motion of channel estimation in consecutive n frames. Terminals are different from each other.

That is to say, step S182 can be implemented by the first processing unit 182. Step S184 can be implemented by the second processing unit 184.

As such, the high-speed mobile terminal performs pilot uplink transmission to the high-speed mobile terminal for channel estimation in each frame because the channel changes rapidly and the number is generally small. Since the low-speed mobile terminal has a large number and a slow channel change, it is divided into n equal parts and performs pilot uplink transmission and channel estimation in consecutive n frames. Since the channel information of the low-speed mobile terminal in multiple frames changes little, Therefore, it will not have a great impact on the transmission performance of low-speed mobile terminals. Compared with all low-speed mobile terminals serving at the same time, the same-frequency interference is reduced, and the probability of pilot multiplexing in the same cell 800 is reduced. Although the data transmission time of the terminal 200 is reduced, the transmission rate is significantly improved. Transmission performance has increased.

For example, for a high-speed mobile terminal, all high-speed mobile terminals that need to be serviced are selected, and channel estimation and data transmission are performed in the same frame; for low-speed mobile terminals, low-speed mobile terminals requesting service are divided into four groups, so that the continuous 4 In the frames, the low-speed motion terminals performing channel estimation in different frames are different, that is, channel estimation is performed for one group for each of four consecutive frames. The low-speed mobile terminal serving each frame has only 1/4 of the original (ie, the transmission time becomes 1/4 of the original), but the co-channel interference caused by the transmission is reduced, the pilot pollution is also greatly reduced, and the transmission speed is remarkable. Upgrade. When transmitting data for all low-speed mobile terminals simultaneously, the transmission time of the terminal 200 is long but the transmission speed is slow, and the low-speed mobile terminals requesting the service are divided into n groups and each group is in different frames of consecutive n frames (for example, When a group performs data transmission in the first frame, and the second group performs data transmission in the second frame, etc., the transmission time of each terminal 200 is reduced, but the transmission speed is greatly increased, so that the total unit time is total. The amount of transmission is increased, which not only reduces pilot pollution, but also increases the transmission rate of low-speed mobile terminals.

In some embodiments, the channel estimate is determined by a minimum mean square error estimate to determine channel information.

Referring to FIG. 13, in some embodiments, step S11 includes the following steps:

S112: Perform data transmission on the high-speed mobile terminal in the same frame as the channel estimation, perform data transmission on the low-speed mobile terminal in the mth frame after the channel estimation is completed, and the mth frame corresponds to the downlink delay of the cell 800.

Referring to FIG. 14, in some embodiments, the transmission module 11 includes a transmission unit 112. The transmitting unit 112 is configured to perform data transmission on the high-speed mobile terminal in the same frame as the channel estimation, perform data transmission on the low-speed mobile terminal in the mth frame after the channel estimation is completed, and the mth frame corresponds to the downlink delay of the cell 800. .

That is to say, step S112 can be implemented by the transmission unit 112.

In this way, since the high-speed mobile terminal changes rapidly, the channel estimation and the data transmission are performed in the same frame to reduce the channel estimation error of the high-speed mobile terminal, and the transmission performance of the high-speed mobile terminal is ensured. Moreover, although the channel estimation and data transmission of the low-speed mobile terminal differ by a certain number of frames, since the channel information of the low-speed mobile terminal changes slowly, the data transmission performance of the terminal 200 is not affected, and the time and spectrum resources are still fully utilized. And will not cause waste of resources. The channel estimation and data transmission of the low-speed motion terminal are staggered, which reduces the interference received by the signal received by the low-speed mobile terminal, and the interference of the terminal 200 in the edge area of the cell 800 with strong interference is greatly reduced, and the signal-to-noise ratio is significantly improved, thereby Cell 800 transmission performance is improved.

Specifically, after the channel estimation is completed, according to the downlink delay allocated by the cell 800, as shown in FIG. 4, for example, the downlink delay allocated by the low-speed mobile terminal of the cell 1 is 1 frame, and then the channel estimation is completed. When data transmission is performed in one frame (the first frame refers to the next frame of the current frame), since the downlink delays of the nearby cell 2 and cell 4 are different, the nearby cell 2 and the cell 4 simultaneously perform channel estimation at a low speed. The mobile terminal does not perform data transmission simultaneously with the low-speed mobile terminal of the cell 1. When the low-speed mobile terminal of the cell 1 performs data transmission, the interference is from the terminal 200 using the non-coherent pilot, so the pilot pollution is greatly reduced. The transmission performance of the low-speed mobile terminal of the cell 1 is improved, and the transmission performance of the low-speed mobile terminal of the cell 1 is significantly improved compared with the previous one due to the reduction of pilot pollution. The cell 2 and the cell 4 adjacent to the cell 1 have different downlink delays allocated to the neighboring cell 800, so that the same effect can be achieved (ie, pilot pollution is reduced and the transmission rate is improved), and the transmission performance is also obtained. Improved. Similarly, the cell 800 adjacent to the cell 2 and the cell 4 can also achieve the same effect by allocating different downlink delays (ie, the pilot pollution is reduced and the transmission rate is improved), and so on, and finally The performance of the large-scale multi-antenna system 1000 has been improved.

Referring to FIG. 15, a large-scale multi-antenna system 1000 of an embodiment of the present application includes a plurality of base stations 100, a plurality of terminals 200, one or more processors 300, a memory 400, and one or more programs. One or more of the programs are stored in memory 400 and are configured to be executed by one or more processors 300, the program including instructions for performing the scheduling method of any of the above embodiments.

For example, the program includes instructions for executing the following scheduling methods:

Referring to FIG. 16, a computer readable storage medium 8000 of an embodiment of the present application includes a computer program for use in conjunction with a massive multi-antenna system 1000. The computer program can be executed by processor 300 to perform the scheduling method of any of the above embodiments.

For example, a computer program can be executed by processor 300 to perform the following scheduling methods:

The scheduling method, the scheduling apparatus 10, the large-scale multi-antenna system 1000, and the computer-readable storage medium 8000 of the embodiments of the present application divide the terminal 200 into high-speed mobile terminals by changing the channel information of the communication between the terminal 200 and the base station 100 in the previous frames. And low speed sports terminals. The downlink delay of the high-speed motion terminal is set to 0 to avoid the channel estimation error caused by the Doppler effect of the high-speed motion terminal. The data transmission of the low speed mobile terminal is staggered with the pilot uplink transmission. In this way, since the location of the low-speed mobile terminal is substantially fixed within a few frames, the channel information does not change relatively, and the downlink transmission using the channel information before the digital frame does not significantly affect the transmission performance of the low-speed mobile terminal. In addition, different downlink delays are allocated to the cells 800 of the multiple base stations 100, so that even if there is pilot multiplexing in the low-speed mobile terminals that perform channel estimation in different cells 800, different downlink delays are allocated between the cells 800 to enable data transmission. The interference received is greatly reduced, thereby suppressing pilot pollution, and finally the transmission performance of the large-scale multi-antenna system 1000 is improved.

While the embodiments of the present application have been shown and described above, it is understood that the foregoing embodiments are illustrative and are not to be construed as limiting the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

A scheduling method for controlling a large-scale multi-antenna system, the large-scale multi-antenna system comprising a plurality of base stations, each of the base stations covering a cell for a terminal in the cell to pass the large-scale multi-antenna system Communicating, characterized in that the scheduling method comprises the following steps:

Dividing the terminal into a high-speed motion terminal and a low-speed motion terminal according to a change in channel information in which the terminal communicates with the base station according to a previous number of frames; and

Allocating a downlink delay to the low-speed mobile terminal of the cell according to the location of the multiple base stations, so that the low-speed mobile terminal of the adjacent cell allocates different downlink delays, where the downlink The delay is the number of frames between the low-speed mobile terminal and the start data uplink transmission after the completion of the pilot uplink transmission, and the downlink motion delay of the high-speed motion terminal is 0.
The scheduling method according to claim 1, wherein the step of dividing the terminal into a high-speed mobile terminal and a low-speed mobile terminal according to a change in channel information in which the terminal communicates with the base station in a previous frame includes The following steps:

Determining a time varying parameter of the terminal according to a change of the channel information of the previous frames;

Determining whether the time varying parameter is greater than a predetermined threshold;

Determining that the terminal is the low speed motion terminal when the time varying parameter is greater than the predetermined threshold; and

When the time varying parameter is less than or equal to the predetermined threshold, determining that the terminal is the high speed mobile terminal.
The scheduling method according to claim 1, wherein the scheduling method further comprises the following steps:

And allocating, according to the downlink delay of the cell, the downlink delay to the cell after a predetermined time, so that the downlink delay of the cell with the downlink delay is the smallest The delay delays the number of frames of the downlink delay of the remaining cells by one.
The scheduling method according to claim 1, wherein the scheduling method further comprises the following steps:

Selecting, by the terminal requesting service, the pilot uplink transmission and performing channel estimation according to the pilot to obtain the channel information; and

And performing data transmission on the high speed motion terminal and the low speed motion terminal according to the downlink delay and the channel information, respectively.
The scheduling method according to claim 4, wherein the step of selecting the requesting service to perform the pilot uplink transmission and performing channel estimation according to the pilot to obtain the channel information comprises the following steps :

Selecting, by the high speed mobile terminal requesting service, the pilot uplink transmission and performing the channel estimation according to the pilot; and

Deriving the low-speed mobile terminal that requests all services to n equal parts and performing the pilot uplink transmission in consecutive n frames and performing the channel estimation according to the pilot such that the channel estimation is performed in consecutive n frames The low speed motion terminals are different from each other.
The scheduling method of claim 4 wherein said channel estimate is determined by a least mean square error estimate to determine said channel information.
The scheduling method according to claim 4, wherein the step of performing data transmission on the high speed mobile terminal and the low speed mobile terminal according to the downlink delay and the channel information respectively comprises the following steps:

Performing the data transmission on the high-speed mobile terminal in the same frame as the channel estimation, and performing the data transmission on the low-speed mobile terminal in the mth frame after the channel estimation is completed, the mth The frame corresponds to the downlink delay of the cell.
A scheduling apparatus for controlling a large-scale multi-antenna system, the large-scale multi-antenna system comprising a plurality of base stations, each of the base stations covering a cell for a terminal in the cell to pass the large-scale multi-antenna system Communicating, characterized in that the scheduling device comprises:

a dividing module, configured to divide the terminal into a high-speed mobile terminal and a low-speed mobile terminal according to a change in channel information that the terminal communicates with the base station in a previous frame; and

a first allocation module, where the allocation module is configured to allocate a downlink delay to the low-speed mobile terminal of the cell according to a location of the multiple base stations, so that the low-speed mobile terminals of the adjacent cells are allocated different The downlink delay, where the downlink delay is the number of frames between the low-speed mobile terminal and the start data uplink transmission after the pilot uplink transmission is completed, and the high-speed motion terminal downlink delay is 0.
The scheduling apparatus according to claim 8, wherein the dividing module comprises:

a first determining unit, configured to determine a time varying parameter of the terminal according to a change of the channel information of the previous frames;

a determining unit, configured to determine whether the time varying parameter is greater than a predetermined threshold;

a second determining unit, configured to: when the time varying parameter is greater than the predetermined threshold, determine that the terminal is the low speed mobile terminal; and

a third determining unit, configured to determine that the terminal is the high-speed mobile terminal when the time-varying parameter is less than or equal to the predetermined threshold.
The scheduling apparatus according to claim 8, wherein said scheduling apparatus comprises:

a second allocation module, where the second allocation module is configured to re-allocate the downlink delay to the cell according to the downlink delay of the cell, and the cell with the downlink delay is minimized. The downlink delay is changed to the maximum downlink delay and the number of frames of the downlink delay of the remaining cells is decreased by one.
The scheduling apparatus according to claim 8, wherein the scheduling apparatus further comprises:

a processing module, configured to select the terminal that requests the service to perform the pilot uplink transmission, and perform channel estimation according to the pilot to obtain the channel information; and

And a transmission module, configured to perform data transmission on the high speed motion terminal and the low speed motion terminal according to the downlink delay and the channel information, respectively.
The scheduling apparatus according to claim 11, wherein the processing module comprises:

a first processing unit, configured to select all high speed mobile terminals requesting service to perform the pilot uplink transmission and perform the channel estimation according to the pilot; and

a second processing unit, configured to divide all low-speed mobile terminals requesting service into n equal parts and perform the pilot uplink transmission in consecutive n frames and perform the channel according to the pilot The estimation is such that the low speed motion terminals that perform the channel estimation in consecutive n frames are different from each other.
The scheduling apparatus of claim 11 wherein said channel estimate is determined by a least mean square error estimate to determine said channel information.
The scheduling apparatus according to claim 11, wherein the transmission module comprises:

a transmission unit, configured to perform the data transmission on the high-speed mobile terminal in the same frame as the channel estimation, and perform the data transmission on the low-speed mobile terminal in an mth frame after the channel estimation is completed. In the data transmission, the mth frame corresponds to the downlink delay of the cell.
A large-scale multi-antenna system, characterized in that the large-scale multi-antenna system comprises:

Multiple base stations;

Multiple terminals;

One or more processors;

Memory;

One or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the program comprising for performing any of claims 1-7 The instruction of the scheduling method described in the item.
A computer readable storage medium, comprising a computer program for use in conjunction with a large-scale multi-antenna system, the computer program being executable by a processor to perform the scheduling method of any of claims 1-7.