WO2018232832A1

WO2018232832A1 - Method and device for determining number of mimo layers

Info

Publication number: WO2018232832A1
Application number: PCT/CN2017/094764
Authority: WO
Inventors: 程勇; 方平; 李小仙; 庞高昆
Original assignee: 华为技术有限公司
Priority date: 2017-06-23
Filing date: 2017-07-27
Publication date: 2018-12-27
Also published as: CN109565306B; CN109565306A

Abstract

Provided are a method and device for determining a number of MIMO layers. The method comprises: a terminal determining the maximum number of MIMO layers that respectively correspond to K network devices serving the terminal, and that can be scheduled for the terminal, wherein the sum of the maximum values of the number of MIMO layers that respectively correspond to K network devices serving the terminal, and that can be scheduled for the terminal, is less than or equal to the maximum value of a number of MIMO layers that can be processed by the terminal; if the terminal determines that the adjustment amount of a number of MIMO layers corresponding to an ith network device, is greater than or equal to a first preset value, the terminal sending a first message, modulated by means of a first modulation mode, to the ith network device, such that the ith network device adjusts the number of MIMO layers scheduled for the terminal to the first preset value; if the terminal determines that the adjustment amount of the number of MIMO layers corresponding to the ith network device, is less than or equal to a second preset value, the terminal sending a second message, modulated by means of the first modulation mode, to the ith network device, such that the ith network device adjusts the number of MIMO layers scheduled for the terminal to the second preset value.

Description

Method and device for determining MIMO layer number

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. In this application.

Technical field

The present application relates to the field of communications technologies, and in particular, to a method and apparatus for determining the number of MIMO layers.

Background technique

The large-scale commercialization of the third-generation (3G) and fourth-generation (4G) mobile communication systems has greatly improved people's communication and facilitated people's lives. In order to meet the increasing demand for wireless data communication by users, international communication standards organizations, such as the third generation partnership project (3GPP), have begun to develop fifth generation (5G) mobile communication system standards. In order to increase system bandwidth and data transmission rate, 5G mobile communication systems consider the use of high frequency (HF) carrier frequency bands, for example, using frequencies around 30 GHz (such as 24.25 GHz - 52.6 GHz) and around 70 GHz (such as 66 GHz - 86 GHz). .

Although the high frequency band can provide a very high system bandwidth, the propagation path loss of the high frequency signal is very large, which limits the transmission distance of the high frequency signal, thereby limiting the coverage of the network device using the high frequency band. In order to reduce the propagation loss of high-frequency signals and increase the transmission distance of high-frequency signals, beam forming technology and multi-input multiple-output (MIMO) technology will be used in 5G communication systems.

High-frequency signals (for example, 70 GHz radio wave signals) have poor diffraction performance, and it is easy to cause high-frequency signal transmission failure due to occlusion. Therefore, the high frequency band is more suitable for use in a line-of-sight (LoS) scenario. However, in the LoS scenario, due to the lack of multipath transmission, network devices (for example, transmission and reception point (TRP)) and terminals (for example, 5G User Equipment (UE)) may be caused. The channel matrix is low-rank, thus limiting the number of MIMO layers that the network device schedules for the terminal. In order to make full use of multiple antennas on the terminal to provide a higher data transmission rate (for example, multi-layer MIMO transmission) for the terminal, data may be transmitted to one terminal by means of joint transmission of multiple network devices. As shown in Figure 1, two TRPs can be used to send data to one UE. Since multiple TRPs are spatially separated, the channel variation between each TRP and the terminal is irrelevant, which brings spatial diversity gain to the terminal and can provide multiple layers of MIMO transmission for the terminal. Significantly increase the data transfer rate.

However, when multiple network devices are used to transmit data to one terminal, multiple network devices need to coordinate on resource scheduling, which increases the overhead of the backhaul. The resources herein may include time domain, frequency domain, code domain, and airspace resources. Especially in the case of non-ideal backhauls, scheduling at the scheduler level is likely to be impossible due to delays. Therefore, it is preferable that each network device independently performs resource scheduling. However, since each network device performs resource scheduling independently, for a terminal, the sum of the number of MIMO layers scheduled by the multiple network devices on the same time-frequency resource or partially overlapping time-frequency resources may be Exceeding the maximum number of MIMO layers that the terminal can handle, the terminal cannot handle all MIMO layers transmitted to the terminal.

Two solutions are given in the prior art. The following is a brief description of UE1 as an example.

Solution 1: In order to avoid the sum of the number of MIMO layers independently scheduled by UE1 for UE1 exceeds the maximum number of MIMO layers that one UE1 can handle, it can be static or semi-static through the upper layer (for example, L3/RRC). (semi-static) Configure the number of MIMO layers that each network device can schedule for UE1. However, this configuration method cannot fully utilize the channel change condition to maximize the system spectrum efficiency and increase the user data transmission rate.

Solution 2: When UE1 finds that the sum of the number of MIMO layers independently scheduled by UE1 for UE1 exceeds the maximum number of MIMO layers that can be processed by itself, UE1 discards processing part of the MIMO layer. However, this is likely to cause UE1 to fail to correctly decode a codeword and also waste downstream channel resources.

Summary of the invention

The present application provides a method and a device for determining the number of MIMO layers, which are used to solve the problem that the sum of the number of MIMO layers independently scheduled by multiple network devices exceeds the maximum number of MIMO layers that the terminal can process, and the terminal cannot process the terminal. The problem of all MIMO layers transmitted to the terminal.

In a first aspect, the present application provides a method for determining a MIMO layer number, including: determining, by a terminal, a maximum number of MIMO layers that can be scheduled by a terminal for a K network device serving a terminal; and determining, by the terminal, an i-th network When the MIMO layer number adjustment corresponding to the device is greater than or equal to the first preset value, the terminal sends the first message modulated by the first modulation mode to the i th network device, so that the i th network device is scheduled by the terminal. The MIMO layer number adjusts the first preset value; when the terminal determines that the MIMO layer number adjustment amount corresponding to the ith network device is less than or equal to the second preset value, the terminal sends the second message modulated by the first modulation mode to The i-th network device adjusts the second preset value by the number of MIMO layers scheduled by the i-th network device for the terminal. The sum of the maximum number of MIMO layers that can be scheduled by the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is a positive integer greater than or equal to 2. The MIMO layer number adjustment amount corresponding to the i-th network device is determined by the terminal according to the MIMO layer number scheduled by the i-th network device known by the terminal and the maximum number of MIMO layers that the i-th network device can schedule for the terminal, The first preset value is a positive integer, the second preset value is a negative integer, and the i-th network device is any one of the K network devices, and i is a positive integer less than or equal to K.

Therefore, with the method provided by the present application, the terminal can avoid the overhead of the backhaul link and reduce the low delay requirement for the backhaul link, and solves the problem that the terminal cannot handle all the MIMO layers transmitted to the terminal. And indicating, by the foregoing method, that the network device adjusts the number of MIMO layers scheduled for the terminal does not increase the uplink communication overhead.

In a possible design, after the terminal determines that the K network devices serving the terminal respectively correspond to the maximum number of MIMO layers that can be scheduled by the terminal, the terminal determines the MIMO layer number adjustment corresponding to the i-th network device. When the second preset value is greater than the second preset value, the terminal sends the first message or the second message modulated by the second modulation mode to the i-th network device, so that the i-th network device is not adjusted to The number of MIMO layers scheduled by the terminal.

Therefore, with the method provided by the present application, when the network device does not need to adjust the number of MIMO layers scheduled by the terminal, the terminal notifies the network device to adjust the number of MIMO layers scheduled for the terminal by changing the modulation mode.

In a possible design, when the first message is an ACK message, the second message may be a NACK message, when the first message is a NACK message, the second message is an ACK message; when the first modulation mode is a binary phase shift When keying BPSK, the second modulation mode may be orthogonal binary phase shift keying QBPSK, when the first modulation mode is In QBPSK, the second modulation method is BPSK.

Therefore, in the present application, the first message, the second message, the first modulation mode, and the second modulation mode provide a combination of multiple implementation manners, and the implementation manner is flexible and convenient.

In a possible design, when the terminal determines that the K network devices serving the terminal respectively correspond to the maximum number of MIMO layers that can be scheduled by the terminal, the terminal performs channel estimation according to the reference signals respectively sent by the K network devices. As a result, the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is determined; if the terminal determines that the total of the maximum number of MIMO layers that can be scheduled by the K network devices is greater than the MIMO layer that the terminal can process. The maximum value, the terminal re-determines the maximum number of MIMO layers that the K network devices can respectively schedule for the terminal according to a preset algorithm.

Therefore, the method provided by the present application ensures that the sum of the maximum number of MIMO layers that can be scheduled for the terminal of the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, and the terminal can not process the transmission to the terminal. The problem of all MIMO layers of the terminal.

In a possible design, the number of MIMO layers scheduled by the i-th network device for the terminal is the number of MIMO layers scheduled by the i-th network device for the terminal or the i-th network determined by the terminal last time. The maximum number of MIMO layers that the device can schedule for the terminal.

Therefore, the number of MIMO layers scheduled by the terminal for each network device in the embodiment of the present application may have multiple possible values, and the implementation manner is flexible and convenient.

In a second aspect, the present application provides a method for determining a number of MIMO layers, including: determining, by a terminal, a maximum number of MIMO layers that can be scheduled by a terminal for a K network device serving a terminal; and performing a terminal to the K network devices. The S network devices respectively send corresponding MIMO layer number adjustment information, S ≤ K; wherein, the total of the maximum number of MIMO layers that can be scheduled by the K network devices is less than or equal to the number of MIMO layers that the terminal can process The maximum value, K is a positive integer greater than or equal to 2, and the MIMO layer number adjustment information corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal or the MIMO corresponding to the jth network device The number of layers adjusted, the MIMO layer number adjustment corresponding to the jth network device is the number of MIMO layers scheduled by the terminal according to the jth network device known by the terminal, and the number of MIMO layers that the jth network device can schedule for the terminal The maximum value determines that the jth network device is any one of the S network devices.

Therefore, the method provided by the present application can adapt to the dynamic change of the wireless channel, improve the spectrum efficiency, and support multiple network devices in the scenario of joint transmission of multiple network devices, and the number of MIMO layers independently scheduled by the terminal, and multiple The sum of the number of MIMO layers independently scheduled by the network device for the terminal does not exceed the maximum number of MIMO layers that the terminal can process, and the overhead of the backhaul link and the requirement for low delay of the backhaul link can be avoided.

In a possible design, the number of MIMO layers scheduled by the jth network device for the terminal is the number of MIMO layers scheduled by the jth network device for the terminal or the jth network determined by the terminal last time. The maximum number of MIMO layers that the device can schedule for the terminal.

In a possible design, when the terminal determines that the K network devices serving the terminal respectively correspond to the maximum number of MIMO layers that can be scheduled by the terminal, the terminal performs channel estimation according to the reference signals respectively sent by the K network devices. As a result, the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is determined; if the terminal determines that the total of the maximum number of MIMO layers that can be scheduled by the K network devices is greater than the MIMO layer that the terminal can process. The maximum number, the terminal re-determines K network devices according to a preset algorithm The corresponding maximum number of MIMO layers that can be scheduled for the terminal.

In a possible design, when the terminal separately sends the corresponding MIMO layer number adjustment information to the S network devices of the K network devices, the terminal respectively sends a corresponding acknowledgement ACK message or non-acknowledgement NACK message to the S network devices. The ACK message or the NACK message corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal or the MIMO layer number adjustment corresponding to the jth network device.

Therefore, the method provided by the embodiment of the present application can save the uplink overhead by using the original ACK message and the NACK message to carry the MIMO layer number adjustment amount without adding a new message format and type.

In a possible design, the terminal may separately send corresponding MIMO layer number adjustment information to the S network devices on the dedicated physical uplink control channel PUCCH resource; or, the terminal may use the medium access control control element MAC CE to the S The network device separately transmits corresponding MIMO layer number adjustment information.

Therefore, by using the method provided by the application, the terminal can send the MIMO layer number adjustment message to the network device in multiple forms, and the implementation manner is flexible and convenient.

In a possible design, the S network devices include a network device that the terminal has not sent the maximum number of MIMO layers that can be scheduled for the terminal, and the number of MIMO layers that the terminal knows for the terminal and the terminal can determine as the terminal. A network device with a different maximum number of MIMO layers scheduled.

The network device that is known by the terminal to be the number of MIMO layers scheduled by the terminal and the maximum number of MIMO layers that the terminal can determine for the terminal to be scheduled is the network device to which the terminal has transmitted the maximum number of MIMO layers that can be scheduled for the terminal. However, the terminal does not change according to the maximum number of MIMO layers that the network device can determine for the terminal, and the known number of MIMO layers that the network device schedules for the terminal, so the terminal can adjust the network device without notifying the network device. The number of MIMO layers scheduled for the terminal. That is, the corresponding MIMO layer number adjustment information is not sent to the network device, so as to save uplink communication overhead. Therefore, the terminal may choose to separately send corresponding MIMO layer number adjustment information to all K network devices. Alternatively, the terminal may select to send corresponding MIMO layer number adjustment information to the S network devices of the K network devices.

In a possible design, the terminal sends a corresponding CSI message to the S network devices, and the CSI message corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal.

This approach is applied to scenarios where the terminal is configured to require feedback of the rank of the MIMO channel matrix to the network device. The terminal only needs to carry the corresponding RI in the CSI, and the RI indicates the maximum number of MIMO layers that the network device can schedule for the terminal.

In a third aspect, the present application provides a method for determining a MIMO layer number, comprising: receiving, by a network device, a first message modulated by a terminal by using a first modulation mode; and determining, by the network device, a correspondence between a modulation mode, a message type, and a preset value, Determining a first preset value corresponding to the first modulation mode and the first message, and adjusting a first preset value for the number of MIMO layers scheduled by the terminal; or, the network device receiving the terminal modulated by the first modulation mode And the network device determines, according to the modulation mode, the correspondence between the message type and the preset value, the second preset value corresponding to the first modulation mode and the first message, and adjusts the second MIMO layer number for the terminal scheduling. The preset value; wherein the first preset value is a positive integer, and the second preset value is a negative integer.

Therefore, the method provided by the present application solves the problem that the terminal cannot process all the MIMO layers transmitted to the terminal, and the method for indicating that the network device adjusts the number of MIMO layers scheduled for the terminal does not increase the uplink. Communication overhead.

In a possible design, the network device receives the first message modulated by the terminal by using the second modulation mode; and the network device determines, according to the modulation mode, the correspondence between the message and the preset value, the second modulation mode and the first message. Corresponding the third preset value, the network device does not adjust to the number of MIMO layers scheduled by the terminal; or the network device receives the second message modulated by the terminal by using the second modulation mode; the network device is configured according to the modulation mode, the message, and the preset value. Corresponding relationship, determining a third preset value corresponding to the second modulation mode and the second message, the network device does not adjust to the number of MIMO layers scheduled by the terminal; wherein, the third preset value is 0.

In a possible design, when the first message is an ACK message, the second message is a NACK message, when the first message is a NACK message, the second message is an ACK message; when the first modulation mode is a binary phase shift key When BPSK is controlled, the second modulation mode is orthogonal binary phase shift keying QBPSK. When the first modulation mode is QBPSK, the second modulation mode is BPSK.

In a fourth aspect, the application provides a method for determining a MIMO layer number, including: receiving, by a network device, MIMO layer number adjustment information sent by a terminal. The network device adjusts the number of MIMO layers scheduled for the terminal according to the MIMO layer number adjustment information. The MIMO layer number adjustment information carries the maximum number of MIMO layers that the network device can schedule for the terminal or the MIMO layer number adjustment corresponding to the network device, and the MIMO layer number adjustment amount corresponding to the network device is determined by the terminal according to the network device known by the terminal. The number of MIMO layers and network devices scheduled by the terminal can be determined for the maximum number of MIMO layers scheduled by the terminal.

In a possible design, the number of MIMO layers scheduled by the network device for the terminal is the number of MIMO layers scheduled by the network device for the terminal or the number of MIMO layers that the terminal device can determine for the terminal. Maximum value.

In a possible design, the network device receives an ACK message or a NACK message sent by the terminal, and the ACK message or the NACK message carries a maximum number of MIMO layers that the network device can schedule for the terminal or a MIMO layer number adjustment corresponding to the network device.

Therefore, the method provided by the embodiment of the present application can save the uplink overhead by using the original ACK message and the NACK message to carry the MIMO layer number adjustment amount without adding a new erasure format and type.

In a fifth aspect, the application provides a terminal, including: a sending unit and a processing unit;

The processing unit is configured to determine a maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that provide services for the terminal, where the K network devices respectively correspond to the The sum of the maximum number of MIMO layers scheduled by the terminal is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is a positive integer greater than or equal to 2; the processing unit is further configured to: when determining the i-th network Equipment pair When the MIMO layer number adjustment amount is greater than or equal to the first preset value, the first message modulated by the first modulation mode is sent to the ith network device by using the sending unit, so that the The ith network device adjusts the first preset value for the number of MIMO layers scheduled by the terminal; and when it is determined that the MIMO layer number adjustment amount corresponding to the ith network device is less than or equal to the second preset value Transmitting, by the sending unit, the second message that is modulated by the first modulation mode to the i th network device, so that the i th network device adjusts a MIMO layer number scheduled by the terminal a second preset value; wherein the MIMO layer number adjustment amount corresponding to the ith network device is the number of MIMO layers that the terminal schedules for the terminal according to the i th network device known by the terminal And determining, by the ith network device, a maximum number of MIMO layers scheduled by the terminal, where the first preset value is a positive integer, and the second preset value is a negative integer, the ith The network device is any one of the K network devices, i is small K is a positive integer equal to or.

In a possible design, the processing unit is further configured to: after determining that the K network devices serving the terminal respectively correspond to the maximum number of MIMO layers that can be scheduled for the terminal, when determining When the MIMO layer number adjustment amount corresponding to the i th network device is greater than the second preset value and smaller than the first preset value, the first message or the second message modulated by the second modulation mode is passed through Transmitting, by the sending unit, the i-th network device, so that the i-th network device does not adjust to the number of MIMO layers scheduled by the terminal.

In a possible design, when the first message is an ACK message, the second message is a NACK message, and when the first message is a NACK message, the second message is an ACK message; When the first modulation mode is binary phase shift keying BPSK, the second modulation mode is orthogonal binary phase shift keying QBPSK, and when the first modulation mode is QBPSK, the second modulation mode is BPSK.

In a possible design, the processing unit is configured to: perform channel estimation according to the reference signals respectively sent by the K network devices, and determine that the K network devices respectively can be scheduled for the terminal a maximum number of MIMO layers; if it is determined that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, according to a preset algorithm Determining, by the K network devices, a maximum number of MIMO layers that can be scheduled for the terminal.

In a possible design, the number of MIMO layers scheduled by the i-th network device for the terminal is the number of MIMO layers scheduled by the i-th network device for the terminal. Or the maximum number of MIMO layers that the i-th network device determined by the terminal last time can be scheduled for the terminal.

In a sixth aspect, the application provides a terminal, including: a processing unit and a sending unit;

The processing unit is configured to determine a maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that provide services for the terminal, where the K network devices respectively correspond to the The sum of the maximum number of MIMO layers scheduled by the terminal is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is a positive integer greater than or equal to 2; the sending unit is configured to be used in the K network devices The S network devices respectively transmit the corresponding MIMO layer number adjustment information, S ≤ K, wherein the MIMO layer number adjustment information corresponding to the jth network device carries the MIMO layer that the jth network device can schedule for the terminal a maximum value or a MIMO layer number adjustment amount corresponding to the jth network device, where the MIMO layer number adjustment amount corresponding to the jth network device is the jth network that the terminal is known according to the terminal The number of MIMO layers scheduled by the device for the terminal and the maximum number of MIMO layers that the jth network device can schedule for the terminal, where the jth network device is any one of the S network devices A network device.

In a possible design, the number of MIMO layers scheduled by the jth network device for the terminal is the number of MIMO layers scheduled by the jth network device for the terminal. Or the terminal The last determined number of MIMO layers that the jth network device can schedule for the terminal.

In one possible design, the processing unit is configured to:

Determining, according to a result of performing channel estimation by the reference signals respectively sent by the K network devices, determining a maximum number of MIMO layers that the K network devices respectively can be scheduled for the terminal;

If it is determined that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the terminal re-determines the K according to a preset algorithm. Each of the network devices corresponds to a maximum number of MIMO layers that can be scheduled for the terminal.

In a possible design, the transmitting unit is used for

Sending a corresponding acknowledgement ACK message or a non-acknowledgement NACK message to the S network devices, where the ACK message or the NACK message corresponding to the jth network device carries the MIMO that the jth network device can schedule for the terminal The maximum number of layers or the amount of MIMO layer adjustment corresponding to the jth network device.

In a seventh aspect, the application provides a network device, including: a processing unit, a receiving unit;

The receiving unit is configured to receive a first message that is modulated by the terminal by using a first modulation manner, where the processing unit is configured to determine, according to a modulation mode, a correspondence between a message type and a preset value, and the first modulation mode. The first preset value corresponding to the first message, and the first preset value is adjusted for the number of MIMO layers scheduled by the terminal; or the receiving unit is configured to receive the terminal by using the first a second message modulated by the modulation mode; the processing unit is configured to determine, according to the modulation mode, the correspondence between the message type and the preset value, the second corresponding to the first modulation mode and the first message a preset value, and adjusting the second preset value for the number of MIMO layers scheduled by the terminal; wherein the first preset value is a positive integer, and the second preset value is a negative integer.

In a possible design, the receiving unit is configured to receive the first message that is modulated by the terminal by using a second modulation manner, and the processing unit is configured to use, according to the modulation mode, a message, and a preset a third preset value corresponding to the second modulation mode and the first message, where the network device does not adjust the number of MIMO layers scheduled by the terminal; or the receiving unit And the processing unit is configured to determine the second modulation according to the modulation mode, the correspondence between the message and the preset value, and the second message. And the third preset value corresponding to the second message, the network device does not adjust the number of MIMO layers scheduled by the terminal; wherein the third preset value is 0.

In an eighth aspect, a network device includes: a processing unit, and a receiving unit;

The receiving unit is configured to receive MIMO layer number adjustment information sent by the terminal, where the MIMO layer number adjustment information carries a maximum number of MIMO layers that the network device can schedule for the terminal or a corresponding network device a MIMO layer number adjustment amount, the MIMO layer number adjustment amount corresponding to the network device is a MIMO layer number that the terminal schedules for the terminal according to the network device known by the terminal, and the network device can be the The processing unit is configured to adjust the number of MIMO layers scheduled by the terminal according to the MIMO layer number adjustment information.

In a possible design, the number of MIMO layers scheduled by the network device for the terminal is the number of MIMO layers scheduled by the network device for the terminal or the last time of the terminal. The determined maximum number of MIMO layers that the network device can schedule for the terminal.

In a possible design, the receiving unit is configured to: receive an ACK message or a NACK message sent by the terminal, where the ACK message or the NACK message carries MIMO that the network device can schedule for the terminal The maximum number of layers or the amount of MIMO layer adjustment corresponding to the network device.

In a ninth aspect, the embodiment of the present invention further provides a terminal, where the terminal has a function of implementing terminal behavior in the method instance of the foregoing first aspect. The structure of the terminal includes a transceiver, a processor, and the transceiver is configured to perform communication interaction with a network device, and the processor is configured to support the terminal to perform a corresponding function in the method of the foregoing first aspect. The terminal can also include a memory coupled to the processor that retains program instructions and data necessary for the terminal.

In a tenth aspect, the embodiment of the present invention further provides a terminal, where the terminal has a function of implementing terminal behavior in the method instance of the foregoing second aspect. The structure of the terminal includes a transceiver, a processor, and the transceiver is configured to perform communication interaction with a network device, and the processor is configured to support the terminal to perform a corresponding function in the method of the second aspect. The terminal can also include a memory coupled to the processor that retains program instructions and data necessary for the terminal.

In an eleventh aspect, the embodiment of the present application further provides a network device, where the network device has a function of implementing network device behavior in the method instance of the foregoing third aspect. The structure of the network device includes a processor, a transceiver, and the transceiver is configured to perform communication interaction with the terminal, and the processor is configured to support the network device to perform a corresponding function in the method of the foregoing third aspect. The network device can also include a memory coupled to the processor that retains program instructions and data necessary for the network device.

In a twelfth aspect, the embodiment of the present application further provides a network device, where the network device has a function of implementing network device behavior in the method instance of the foregoing fourth aspect. The structure of the network device includes a processor, a transceiver, and the transceiver is configured to perform communication interaction with the terminal, and the processor is configured to support the network device to perform a corresponding function in the method of the foregoing fourth aspect. The network device can also include a memory coupled to the processor that retains program instructions and data necessary for the network device.

In a thirteenth aspect, the embodiment of the present application further provides a communication system, where the communication system includes multiple network devices and terminals.

In a fourteenth aspect, the embodiment of the present application further provides a first non-transitory computer storage medium, where computer executable instructions are stored, where the computer executable instructions are used to perform the foregoing first or second aspect of the present application. method.

In a fifteenth aspect, the embodiment of the present application further provides a second non-transitory computer storage medium, where computer executable instructions are stored, where the computer executable instructions are used to perform the foregoing third or fourth aspect of the present application. method.

In a sixteenth aspect, the embodiment of the present application further provides a first computer program product, the computer program product comprising a computer program stored on the first non-transitory computer storage medium, the computer program comprising program instructions And when the program instructions are executed by a computer, causing the computer to perform the method of the first aspect or the second aspect of the present application.

In a seventeenth aspect, the embodiment of the present application further provides a second computer program product, the computer program product comprising a computer program stored on the second non-transitory computer storage medium, the computer program comprising program instructions And when the program instructions are executed by a computer, causing the computer to perform the method of the third aspect or the fourth aspect of the present application.

By adopting the method provided by the present application, the dynamic change of the wireless channel can be adapted, the spectrum efficiency is improved, and the In a scenario where multiple network devices perform joint transmission, multiple network devices are MIMO layers that are independently scheduled by the terminal, and the total number of MIMO layers that ensure that multiple network devices are independently scheduled by the terminal does not exceed the number of MIMO layers that the terminal can process. The maximum value also avoids the overhead of the backhaul link and reduces the low latency requirements for the backhaul link.

DRAWINGS

1 is a schematic diagram of a scenario in which two TRPs jointly send data to one UE in the background art of the present application;

2 is a schematic diagram of a main application scenario in an embodiment of the present application;

3 is a flowchart of an overview of a method for determining a MIMO layer number in an embodiment of the present application;

4 is a BPSK constellation diagram and a QBPSK constellation diagram in the embodiment of the present application;

FIG. 5 is a second flowchart of an overview of a method for determining a MIMO layer number in an embodiment of the present application;

FIG. 6 is a schematic diagram of a specific process for determining the number of MIMO layers in the embodiment of the present application;

FIG. 7 is a schematic structural diagram of a unit of a terminal in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a unit of a network device according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a physical structure of a terminal in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a physical structure of a network device according to an embodiment of the present application.

Detailed ways

Embodiments of the present application will be described below with reference to the accompanying drawings.

In the embodiment of the present application, the downlink refers to the message transmission of the network device to the terminal, and the uplink refers to the message transmission of the terminal to the network device. The system to which the embodiment of the present application is applicable may be a system using frequency division duplex (FDD) or a system of time division duplex (TDD).

The network element involved in the embodiment of the present application includes a network device and a terminal. The network device is an access device that the terminal accesses to the mobile communication system by using a wireless device, and may be a base station (NodeB), an evolved base station (eNodeB), a base station in a 5G mobile communication system, a small base station, and a micro base station. The TRP, the base station in the future mobile communication system, or the access node in the WiFi system, and the like, the embodiment of the present application does not limit the specific technology and the specific device mode adopted by the network device.

The terminal may also be called a terminal equipment, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), or the like. The terminal can be a mobile phone, a tablet (Pad, a tablet), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, an industrial control (industrial) Wireless terminal in control, wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, transportation safety A wireless terminal, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like.

The embodiment of the present application is applied to a scenario in which a plurality of network devices are jointly transmitted. For a terminal, a plurality of network devices that send data to the terminal form a network device set, which may be referred to as a service network device set, which is also referred to as a terminal, and is associated with a network device in the service network device set, or provides the terminal with Multiple network devices serving. Wherein, multiple network devices may be one gNB (Next Generation Node B, next generation base station) The control may also be controlled by multiple gNBs, or a plurality of network devices may be connected to one gNB or may be connected to multiple gNBs.

The main application scenario of the embodiment of the present application is described below with reference to FIG. 2 .

As shown in FIG. 2, in a multi-TRP joint transmission scenario, a TPR serving a UE is called a Serving TRP Set, and the serving TRP set may include K TRPs, where K Is an integer greater than or equal to 2. Therefore, there may be K TRPs serving one UE at the same time, that is, each TRP may send one or more scheduling information (such as downlink control information (DCI)) to the UE and/or corresponding to the foregoing scheduling information. Data (for example, physical downlink shared channel (PDSCH)).

The K TRPs may be connected to the same gNB, that is, controlled by the same gNB. When the K TRPs are independently scheduled, the total number of MIMO layers scheduled by the K TRPs on the same time-frequency resource or partially overlapping time-frequency resources may exceed the MIMO that the UE can process. The maximum number of layers causes the terminal to fail to process all MIMO layers transmitted to the terminal, thereby causing UE decoding errors and waste of downlink channel resources.

The method provided by the embodiment of the present application can effectively avoid the above problems. As shown in FIG. 3, an embodiment of the present application provides a method for determining a MIMO layer number, where the method includes:

Step 300: The terminal determines the maximum number of MIMO layers that can be scheduled by the K network devices that provide services for the terminal.

The sum of the maximum number of MIMO layers that can be scheduled by the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is a positive integer greater than or equal to 2.

Step 310a: When the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is greater than or equal to the first preset value, the terminal sends the first message modulated by the first modulation mode to the i th network device, The second preset value is adjusted by the number of MIMO layers scheduled by the i-th network device for the terminal.

Step 320a: The network device receives the first message that is modulated by the first modulation mode and is configured by the terminal, and determines, according to the modulation mode, the correspondence between the message type and the preset value, the first corresponding to the first modulation mode and the first message. The preset value is adjusted, and the first preset value is adjusted for the number of MIMO layers scheduled by the terminal.

Step 310b: When the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is less than or equal to the second preset value, the terminal sends the second message modulated by the first modulation mode to the i th network device, The second preset value is adjusted by the number of MIMO layers scheduled by the i-th network device for the terminal.

Step 320b: The network device receives the second message that is sent by the terminal and is modulated by the first modulation mode, and determines, according to the modulation mode, the correspondence between the message type and the preset value, the second corresponding to the first modulation mode and the second message. The preset value is adjusted, and the second preset value is adjusted for the number of MIMO layers scheduled by the terminal.

The MIMO layer number adjustment amount corresponding to the i-th network device is determined by the terminal according to the ith layer of the ith layer that is known by the terminal, and the maximum number of MIMO layers that the i-th network device can schedule for the terminal. The first preset value is a positive integer, and the second preset value is a negative integer. The i-th network device is any one of the K network devices, and i is a positive integer less than or equal to K.

It should be understood that the above steps 310a and 320a, and step 310b and step 320b are two possible cases.

For the step 300, in a possible design, the terminal determines the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that serve the terminal, and may be, but not limited to, the following:

The terminal performs channel estimation according to the reference signals respectively sent by the K network devices, and determines the maximum number of MIMO layers that the K network devices respectively can be scheduled for the terminal. If the terminal determines that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the terminal re-determines according to the preset algorithm that the corresponding devices of the K network devices can be terminals. The maximum number of MIMO layers scheduled. If the terminal determines that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, the terminal does not need to re-determine that the K network devices respectively can be scheduled for the terminal. The maximum number of MIMO layers. Therefore, the above method ensures that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, and can solve the problem that the terminal cannot process the transmission to the terminal. All MIMO layer issues.

The following uses a network device as an example to describe how the terminal determines the maximum number of MIMO layers that the network device can schedule for the terminal. The reference signal sent by the network device may be a channel state information reference signal (CSI-RS), or a demodulation reference signal (DMRS), or a cell-specific reference signal (cell). -specific reference Signal, CRS). Therefore, the terminal can measure and estimate the downlink channel or the channel matrix according to any one of the reference signals to obtain channel state information (CSI). The CSI may include at least one of the following: a channel quality indicator (CQI), a rank indication (RI) of the MIMO channel matrix, a precoding matrix indicator (PMI), or a precoding. Type indication (PTI). The RI indicates the maximum number of MIMO layers that the network device can schedule for the terminal.

Therefore, the terminal can obtain the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices by using the foregoing method. For example, the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices are respectively S ₁ , S ₂ , . . . , S _K .

Further, the terminal calculates a maximum number of MIMO layers that can be scheduled for the terminal by the K network devices.

When the total number of MIMO layers that can be scheduled for the terminal corresponding to the K network devices is less than or equal to

When the total number of MIMO layers that can be scheduled for the terminal of the K network devices is greater than the terminal

It can be determined by the terminal manufacturer. It should be noted that the predetermined algorithm for determining (R ₁ , R ₂ , ..., R _K ) given below is not limited by the present application.

Algorithm 1: The terminal can first sort (S ₁ , S ₂ , ..., S _K ) from large to small, and then perform a subtraction process in turn.

When B=1, K=3, it is only necessary to decrement the maximum value in (S ₁ , S ₂ , . . . , S _K ). When B>K, the (S ₁ , S ₂ ,..., S _K ) is sequentially decremented until the difference between the sum of the subtracted ones and L is less than or equal to K, and then when B ≤ K Corresponding processing method.

Further, after the terminal determines the maximum number of MIMO layers that can be scheduled by the terminal for the K network devices that are served by the terminal, the terminal first needs to determine the MIMO layer number adjustment amount corresponding to each network device, that is, the calculation is known. The network device is the difference between the number of MIMO layers scheduled by the terminal and the maximum number of MIMO layers that the network device can schedule for the terminal.

The following takes the i-th network device as an example to describe how the terminal calculates the MIMO layer number adjustment amount C _i corresponding to the i-th network device. It is assumed that the maximum number of MIMO layers that the i-th network device can schedule for the terminal is R _i .

Specifically, the number of MIMO layers scheduled by the i-th network device that is known by the terminal may be the following two possible values:

The first possible value: the number of MIMO layers scheduled by the i-th network device for the terminal is P _i .

The MIMO layer number adjustment amount corresponding to the i-th network device is C _i =R _i -P _i .

The second possible value is: the MIMO layer maximum value Q _i that the i-th network device determined by the terminal last time can be scheduled for the terminal.

The MIMO layer number adjustment amount corresponding to the i-th network device is C _i =R _i -Q _i .

After the terminal obtains the MIMO layer number adjustment corresponding to the i-th network device, the terminal determines the MIMO layer number adjustment amount and the preset value corresponding to the i-th network device according to the modulation mode, the correspondence between the message type and the preset value. The relationship determines the modulation mode and message type used to send messages to the i-th network device.

Specifically, the correspondence between the modulation mode, the message type, and the preset value is as shown in Table 1.

Table 1

Therefore, when the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is greater than or equal to the first preset value, for example, the first preset value is 2, the MIMO layer number adjustment amount corresponding to the i th network device is 3. The terminal sends the first message modulated by the first modulation mode to the i th network device, so that the i th network device adjusts the first preset value of the number of MIMO layers scheduled by the terminal. The network device receives the first message modulated by the first modulation mode sent by the terminal, and determines the first modulation mode according to the modulation mode, the correspondence between the message type and the preset value, and The first message corresponds to the first preset value, and the first preset value is adjusted for the number of MIMO layers scheduled by the terminal, that is, the number of MIMO layers scheduled by the terminal is increased by two layers.

When the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is less than or equal to the second preset value, for example, the second preset value is -2, the MIMO layer number adjustment amount corresponding to the i th network device is - 3. The terminal sends the second message modulated by the first modulation mode to the i th network device. The network device receives the second message that is sent by the terminal and is modulated by the first modulation mode, and determines a second preset value corresponding to the first modulation mode and the first message according to the modulation mode, the correspondence between the message type and the preset value. And adjusting the second preset value for the number of MIMO layers scheduled by the terminal, that is, reducing the number of MIMO layers scheduled by the terminal by two layers.

Further, when the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is greater than the second preset value and is less than the first preset value, for example, the first preset value is 2, and the second preset value is - 2. The MIMO layer number adjustment amount corresponding to the i-th network device is -1, and the terminal sends the first message or the second message modulated by the second modulation mode to the i-th network device, so that the i-th network device The number of MIMO layers scheduled for the terminal is not adjusted. The network device receives the first message that is sent by the terminal and is modulated by the second modulation mode, and the network device determines, according to the modulation mode, the correspondence between the message and the preset value, the third preset corresponding to the second modulation mode and the first message. The value of the network device is not adjusted to the number of MIMO layers scheduled by the terminal; or the network device receives the second message that is sent by the terminal and modulated by the second modulation mode, and the network device is configured according to the modulation mode. And determining, by the corresponding relationship between the message and the preset value, a third preset value corresponding to the second modulation mode and the second message. Because the third preset value is 0, the network device does not adjust the number of MIMO layers scheduled by the terminal.

In a possible design, when the first message is an acknowledgement (ACK) message, the second message is a negative acknowledgement (NACK) message, and when the first message is a NACK message, the second message is an ACK. Message.

In a possible design, when the first modulation mode is Binary Phase Shift Keying (BPSK), the second modulation mode is Quadrature Binary Phase Shift Keying (QBPSK). When the first modulation mode is QBPSK, the second modulation mode is BPSK.

Figure 4 shows the BPSK constellation and the QBPSK constellation. Among them, BPSK and QBPSK are relative, that is, the QBPSK constellation is obtained by rotating the BPSK constellation by 90 degrees. In addition, the constellation of BPSK can be other forms, for example, a constellation of BPSK is obtained from a constellation diagram of Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM).

It should be understood that, by using the foregoing indication manner, the terminal indicates that the network device adjusts the number of MIMO layers scheduled by the terminal, and the network device needs to have the capability of automatically identifying two modulation modes, BPSK and QBPSK.

Table 2 is taken as an example to illustrate how the terminal instructs the network device to adjust the number of MIMO layers scheduled by the terminal. Where a is a positive integer and b is a negative integer.

Table 2

Therefore, when the terminal determines that the MIMO layer number adjustment amount corresponding to the network device is greater than or equal to a, the terminal sends the BPSK-modulated ACK to the network device, so that the network device adjusts the number of MIMO layers scheduled by the terminal, that is, increases. a layer.

When the terminal determines that the MIMO layer number adjustment amount corresponding to the network device is less than or equal to b, the terminal sends the BPSK-modulated NACK to the network device, so that the network device adjusts b for the MIMO layer number scheduled by the terminal, that is, decreases. Layer b.

When the terminal determines that the MIMO layer number adjustment amount corresponding to the network device is greater than b and less than a, the terminal sends the ACK or NACK after the QBPSK modulation to the network device, so that the network device does not adjust to the number of MIMO layers scheduled by the terminal.

In summary, through the embodiment shown in FIG. 3, the terminal can avoid the overhead of the backhaul link and reduce the low delay requirement for the backhaul link, and solves the problem that the terminal cannot handle all the MIMO layers transmitted to the terminal. And indicating, by the foregoing method, that the network device adjusts the number of MIMO layers scheduled for the terminal does not increase the uplink communication overhead.

In addition to the foregoing embodiment shown in FIG. 3, the embodiment of the present application further provides a method for determining the number of MIMO layers, and the repetition of the embodiment shown in FIG. 3 is not described again.

The specific method is shown in FIG. 5, and the method includes:

Step 500: The terminal determines, according to the K network devices that provide services for the terminal, the maximum number of MIMO layers that can be scheduled by the terminal.

It should be understood that step 500 is the same as the specific implementation of step 300 in FIG. 3 and will not be described again.

Step 510: The terminal separately sends corresponding MIMO layer number adjustment information to S network devices of the K network devices, where S≤K.

The MIMO layer number adjustment information corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal or the MIMO layer number adjustment corresponding to the jth network device, where the jth network device corresponds The MIMO layer number adjustment is determined by the terminal according to the number of MIMO layers scheduled by the jth network device known to the terminal and the maximum number of MIMO layers that the jth network device can schedule for the terminal, and the jth network device is Any of the S network devices.

It should be noted that the step 500 is the same as the specific implementation manner of the step 300 in FIG. 3, and the calculation method of the MIMO layer number adjustment amount corresponding to the jth network device is also the same as the calculation method mentioned in the embodiment shown in FIG. , the repetition will not be repeated.

It should be understood that the network device that the terminal does not send the maximum number of MIMO layers that can be scheduled for the terminal may be the network device that serves the terminal for the first time. For example, when the network device set serving the terminal changes, there may be New network devices serve the terminal.

The network device that is known by the terminal to be the number of MIMO layers scheduled by the terminal and the maximum number of MIMO layers that the terminal can determine for the terminal to be scheduled is the network to which the terminal has transmitted the maximum number of MIMO layers that can be scheduled for the terminal. The device, but the terminal changes according to the maximum number of MIMO layers that the network device can determine for the terminal, and the known number of MIMO layers that the network device schedules for the terminal, so the terminal needs to notify The network device adjusts to the number of MIMO layers scheduled by the terminal. The network device that is known by the terminal to be the number of MIMO layers scheduled by the terminal and the maximum number of MIMO layers that the terminal can determine for the terminal to be scheduled is the network to which the terminal has transmitted the maximum number of MIMO layers that can be scheduled for the terminal. The device, but the terminal does not change according to the maximum number of MIMO layers that the network device can determine for the terminal, and the known number of MIMO layers that the network device schedules for the terminal, so the terminal does not need to notify the network device. Adjust the number of MIMO layers scheduled for the terminal. That is, the corresponding MIMO layer number adjustment information is not sent to the network device, so as to save uplink communication overhead.

Therefore, the terminal may choose to separately send corresponding MIMO layer number adjustment information to all K network devices. Alternatively, the terminal may select to send the corresponding MIMO layer number adjustment information to the S network devices in the K network devices, and ensure that the maximum number of MIMO layers that the terminal can determine for the terminal and the known ones are The number of MIMO layers scheduled by the terminal is compared with the MIMO layer number adjustment information transmitted by the network device that changes.

Further, for the step 510, the terminal separately sends the corresponding MIMO layer number adjustment information to the S network devices of the K network devices, which may be used in the following manners:

The first way:

The terminal sends a corresponding CSI message to the S network devices, and the CSI message corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal.

It should be understood that, in general, the first approach is applied to a scenario that is more suitable for a terminal that is configured to feed back a rank of a MIMO channel matrix to a network device.

It should be noted that, if the terminal determines that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, the terminal does not need to re-determine that the corresponding corresponding to the K network devices can be The maximum number of MIMO layers scheduled by the terminal. For each network device, the terminal only needs to carry the corresponding RI in the CSI, and the RI indicates the maximum number of MIMO layers that the network device can schedule for the terminal. If the terminal determines that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the terminal re-determines according to the preset algorithm that the corresponding devices of the K network devices can be terminals. The maximum number of MIMO layers to be scheduled. At this time, for each network device, when the terminal carries the corresponding RI in the CSI, the RI at this time may be the maximum value of the original MIMO layer, or the maximum number of MIMO layers re-determined, or CSI. Carrying the corresponding RI is the maximum number of original MIMO layers, and the CSI also carries the maximum value of the re-determined MIMO layer.

It should be understood that the CSI information may be transmitted through a physical uplink shared channel (PUSCH), or may be transmitted through a physical uplink control channel (PUCCH).

The second way:

The terminal sends a corresponding ACK message or a NACK message to the S network devices, and the ACK message or the NACK message corresponding to the jth network device carries the maximum number of MIMO layers or the jth network device that the jth network device can schedule for the terminal. Corresponding MIMO layer number adjustment.

It should be understood that the foregoing ACK message or NACK message may be sent through the PUSCH, or may be sent through the PUCCH.

It should be understood that, in general, the second approach is applied to scenarios that are more suitable for the terminal to be configured to not feed back the rank of the MIMO channel matrix to the network device.

The third way:

The terminal separately transmits corresponding MIMO layer number adjustment information to the S network devices on the dedicated PUCCH resource.

For example, in the fifth generation of new air interface (5G NR) system, the MIMO layer number adjustment information is defined on a dedicated physical basis. Line control channel format and resources (PUCCH Format). Therefore, the terminal can separately send corresponding MIMO layer number adjustment information to the S network devices by using a dedicated uplink physical control channel format and resources. Transmitting the corresponding MIMO layer number adjustment information to the S network devices respectively. The dedicated uplink physical control channel resource may be shared by multiple terminals, and may be code division multiplexed (ie, different terminals may use different codes or sequences). The method is to distinguish MIMO layer number adjustment information of multiple terminals.

The fourth way:

The terminal separately transmits corresponding MIMO layer number adjustment information to the S network devices through a Medium Access Control Control Element (MAC CE).

For example, if the terminal receives an uplink grant grant sent by the kth network device, the terminal may send the MIMO layer number adjustment information to the kth network device by using the MAC CE.

Further, the network device receives the MIMO layer number adjustment information sent by the terminal, and adjusts the number of MIMO layers scheduled by the terminal according to the MIMO layer number adjustment information, including the following two cases:

In the first case, the MIMO layer number adjustment information carries the maximum number of MIMO layers that the network device can schedule for the terminal.

After receiving the MIMO layer number adjustment information sent by the terminal, the network device determines the number of MIMO layers scheduled for the next time according to the maximum number of MIMO layers that the network device can schedule for the terminal, and the next time is the MIMO layer scheduled for the terminal. The number may be less than or equal to the maximum number of MIMO layers that the network device can schedule for the terminal.

In the second case, the MIMO layer number adjustment information carries the MIMO layer number adjustment amount corresponding to the network device.

After receiving the MIMO layer number adjustment information sent by the terminal, the network device determines, according to the MIMO layer number adjustment corresponding to the network device, based on the number of MIMO layers that are known to be scheduled by the terminal (for example, the MIMO that was last scheduled for the terminal) On the basis of the number of layers or based on the last determined maximum number of MIMO layers scheduled for the terminal, the number of MIMO layers scheduled for the terminal is increased or decreased, and the number of MIMO layers scheduled for the next terminal is determined.

In addition, the network device does not receive the MIMO layer number adjustment information sent by the terminal, which may be because the terminal does not have the MIMO layer number adjustment information sent to the network device, or the network device does not receive the MIMO sent by the terminal device. Layer adjustment information. At this time, the network device adopts the maximum value of the default MIMO layer number, for example, the default value is 1, or repeatedly uses the MIMO layer value that was last scheduled for the terminal.

The specific process of determining the number of MIMO layers will be described below with reference to FIG.

It is assumed that the network device 1 and the network device 2 provide services for the terminal, and the network device 1 and the network device 2 successively send reference signals to the terminal, and then the terminal respectively channels the reference signal sent by the network device 1 and the reference signal sent by the network device 2 It is estimated that the terminal determines to provide the terminal with the maximum number of MIMO layers that can be scheduled by the service network device 1 and the network device 2 respectively. For the specific implementation, refer to step 300. The terminal transmits corresponding MIMO layer number adjustment information to the network device 1 and the network device 2, respectively. Specifically, the MIMO layer number adjustment information sent by the terminal to the network device 1 carries the maximum number of MIMO layers (or the MIMO layer number adjustment amount) that the network device 1 can schedule for the terminal, and the number of MIMO layers sent by the network device 1 at the receiving terminal After the information is adjusted, the maximum number of MIMO layers (or the MIMO layer number adjustment amount) that the network device 1 can schedule for the terminal is adjusted to the number of MIMO layers scheduled by the terminal, and the data is transmitted to the terminal. Similarly, the MIMO layer number adjustment information sent by the terminal to the network device 2 carries the maximum number of MIMO layers (or the MIMO layer number adjustment amount) that the network device 2 can schedule for the terminal, and the number of MIMO layers transmitted by the network device 2 at the receiving terminal. After the information is adjusted, the maximum number of MIMO layers (or the MIMO layer number adjustment amount) that the network device 1 can schedule for the terminal is adjusted to the number of MIMO layers scheduled by the terminal, and the data is transmitted to the terminal.

It should be understood that if the network device 1 carried by the MIMO layer number adjustment information can be MIMO for terminal scheduling The maximum number of layers is the same as the number of MIMO layers that the network device 1 knows for the terminal scheduling (or the MIMO layer number adjustment is 0), and the network device 1 does not need to adjust the number of MIMO layers scheduled for the terminal. The number of MIMO layers scheduled by the network device 1 for the terminal is the same as the number of MIMO layers that the network device 1 known by the terminal is scheduled by the terminal.

In summary, the embodiment shown in FIG. 5 can adapt to the dynamic change of the wireless channel, improve the spectrum efficiency, and support multiple network devices in the scenario of joint transmission of multiple network devices, and the number of MIMO layers independently scheduled by the terminal is ensured. The sum of the number of MIMO layers independently scheduled by the plurality of network devices does not exceed the maximum number of MIMO layers that the terminal can process, which can avoid the overhead of the backhaul link and reduce the requirement for low latency of the backhaul link.

Based on the above embodiment, the embodiment of the present application provides a terminal, which is used to implement the method shown in FIG. 3 or FIG. 5. Referring to FIG. 7, the terminal 700 includes: a sending unit 701 and a processing unit 702;

For details, refer to the method embodiment shown in FIG. 3 or FIG. 5 and the foregoing possible design and corresponding descriptions of the corresponding aspects, which are not described herein again.

Based on the above embodiment, the embodiment of the present application provides a network device, which is used to implement a method for selecting a beam as shown in FIG. 3 or FIG. 5. Referring to FIG. 8, the network device 800 includes: a receiving unit 801 and Processing unit 802.

It should be understood that the division of each unit of the above terminal and network device is only a division of logical functions, and the actual implementation may be integrated into one physical entity in whole or in part, or may be physically separated. Moreover, these units may all be implemented in the form of software by means of processing component calls; or may be implemented entirely in hardware; some units may be implemented in software in the form of processing component calls, and some units may be implemented in hardware. For example, the processing unit may be a separately set processing element, or may be integrated in a certain chip. Alternatively, it may be stored in a memory in the form of a program, and a function of the unit is called and executed by a certain processing element. The implementation of other units is similar. In addition, all or part of these units can be integrated or implemented independently. The processing elements described herein can be an integrated circuit that has signal processing capabilities. In the implementation process, each step of the above method or each of the above units may be completed by an integrated logic circuit of hardware in the processor element or an instruction in a form of software. In addition, the above receiving unit is a unit for controlling reception, and can receive information through a receiving device of a terminal or a network device, such as an antenna and a radio frequency device. The above sending unit is a unit for controlling transmission, and can transmit information through a transmitting device of a terminal or a network device, such as an antenna and a radio frequency device.

For example, the above units may be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (digital) Singnal processor (DSP), or one or more Field Programmable Gate Array (FPGA). As another example, when one of the above units is implemented in the form of a processing component scheduler, the processing element can be a general purpose processor, such as a central processing unit (CPU) or other processor that can invoke the program. As another example, these units can be integrated and implemented in the form of a system-on-a-chip (SOC).

Based on the above embodiment, the embodiment of the present application further provides a terminal, which is used to implement the method shown in FIG. 3 or FIG. 5, and has the function of the terminal as shown in FIG. The terminal device includes: one or more transceivers 901, one or more processors 902, one or more memories 903, and one or more antennas 904, wherein the functions of the transmitting unit 701 in FIG. 7 are transmitted and received through the The machine 801 is implemented, and the function of the processing unit 702 is implemented by the processor 902.

The memory 903 is configured to store programs, instructions, and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 903 may include RAM and may also include non-volatile memory, such as at least one disk storage. The processor 902 executes an application stored in the memory 903 to implement the above functions, thereby implementing the method as shown in FIG. 3 or FIG. 5.

For details, refer to the method embodiment shown in FIG. 3 or FIG. 5 and the foregoing possible design and corresponding descriptions of the corresponding aspects, which are not described herein again. Based on the above embodiment, the embodiment of the present application further provides a network device, which is used to implement the method shown in FIG. 3 or FIG. 5, and has the function of the network device as shown in FIG. The network device 1000 includes one or more transceivers 1001, one or more processors 1002, one or more memories 1003, one or more antennas 1004, and one or more other interfaces (eg, fiber optic link interfaces) , an Ethernet interface, and/or a copper wire interface, etc., wherein the function of the receiving unit 801 is implemented by the transceiver 1001, and the function of the processing unit 802 is implemented by the processor 1002,

The memory 1003 is configured to store programs, instructions, and the like. In particular, the program can include program code, the program code including computer operating instructions. The memory 1003 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The processor 1002 executes an application stored in the memory 1003 to implement the above functions, thereby implementing the method shown in FIG.

In summary, the present application provides a method for determining the number of MIMO layers, where the terminal determines the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that provide services for the terminal; when the terminal determines the i-th network device When the corresponding MIMO layer number adjustment is greater than or equal to the first preset value, the terminal sends the first message modulated by the first modulation mode to the i th network device, so that the i th network device is the terminal scheduled MIMO. The number of layers is adjusted to a first preset value; when the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is less than or equal to the second preset value, the terminal sends the second message modulated by the first modulation mode to the first The i network devices adjust the second preset value of the number of MIMO layers scheduled by the i-th network device for the terminal. Therefore, by using the method provided by the present application, the terminal can avoid the overhead of the backhaul link and reduce the requirement for low delay of the backhaul link, and solve the problem that the terminal cannot process all the MIMO layers transmitted to the terminal, and the method is indicated by the foregoing method. The number of MIMO layers that the network device adjusts to the terminal scheduling does not increase the uplink communication overhead.

The present application provides a method for determining the number of MIMO layers, where the terminal determines the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that provide services for the terminal, and the terminal respectively determines the S network devices of the K network devices. Send corresponding MIMO layer number adjustment information, S ≤ K. Therefore, the method provided by the present application can adapt to the dynamic change of the wireless channel, improve the spectrum efficiency, and support multiple network devices in the scenario of joint transmission of multiple network devices, and the number of MIMO layers independently scheduled by the terminal, and multiple The sum of the number of MIMO layers independently scheduled by the network device for the terminal does not exceed the maximum number of MIMO layers that the terminal can process, and the overhead of the backhaul link and the requirement for low delay of the backhaul link can be avoided.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, embodiments of the present application 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.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present application. 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.

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

Claims

A method for determining the number of MIMO layers, comprising:

The terminal determines the maximum number of MIMO layers that can be scheduled for the terminal, and the number of MIMO layers that can be scheduled for the terminal, respectively, corresponding to the K network devices that are served by the terminal. The sum of the maximum values is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is a positive integer greater than or equal to 2;

When the terminal determines that the MIMO layer number adjustment amount corresponding to the i th network device is greater than or equal to the first preset value, the terminal sends the first message modulated by the first modulation mode to the ith a network device, wherein the first preset value is adjusted by the ith network device for the number of MIMO layers scheduled by the terminal;

When the terminal determines that the MIMO layer number adjustment amount corresponding to the ith network device is less than or equal to the second preset value, the terminal sends the second message modulated by the first modulation mode to The i-th network device adjusts the second preset value by the ith network device to schedule the number of MIMO layers scheduled by the terminal;

The MIMO layer number adjustment amount corresponding to the ith network device is the MIMO layer number and the ith network scheduled by the terminal according to the i th network device known by the terminal for the terminal. The device is configured to determine a maximum number of MIMO layers scheduled by the terminal, where the first preset value is a positive integer, the second preset value is a negative integer, and the i th network device is the K Any network device in the network device, i is a positive integer less than or equal to K.
The method according to claim 1, wherein after the terminal determines the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that are served by the terminal, the method further includes:

When the terminal determines that the MIMO layer number adjustment amount corresponding to the ith network device is greater than the second preset value and is smaller than the first preset value, the terminal will be modulated by the second modulation mode. Sending the first message or the second message to the i-th network device, so that the i-th network device does not adjust the number of MIMO layers scheduled by the terminal.
The method according to claim 2, wherein when the first message is an ACK message, the second message is a NACK message, and when the first message is a NACK message, the second message is ACK message;

When the first modulation mode is binary phase shift keying BPSK, the second modulation mode is orthogonal binary phase shift keying QBPSK, and when the first modulation mode is QBPSK, the second modulation mode is BPSK.
The method according to any one of claims 1-3, wherein the terminal determines the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that are served by the terminal, including:

Determining, by the terminal, the channel estimation result according to the reference signal sent by the K network devices, and determining, by the K network devices, a maximum number of MIMO layers that can be scheduled for the terminal;

If the terminal determines that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the terminal re-determines according to a preset algorithm. The K network devices respectively correspond to a maximum number of MIMO layers that can be scheduled for the terminal.
The method according to any one of claims 1-4, wherein the number of MIMO layers scheduled by the i-th network device for the terminal is the i-th network device. The number of MIMO layers scheduled for the terminal at a time or the i-th network device determined by the terminal last time can be scheduled for the terminal The maximum number of MIMO layers.
A method for determining the number of MIMO layers, comprising:

The terminal determines the maximum number of MIMO layers that can be scheduled for the terminal, and the number of MIMO layers that can be scheduled for the terminal, respectively, corresponding to the K network devices that are served by the terminal. The sum of the maximum values is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is a positive integer greater than or equal to 2;

The terminal respectively sends corresponding MIMO layer number adjustment information to S network devices of the K network devices, S≤K;

The MIMO layer number adjustment information corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal or the MIMO layer number adjustment corresponding to the jth network device, The MIMO layer number adjustment amount corresponding to the jth network device is a MIMO layer number that the terminal schedules for the terminal according to the jth network device known by the terminal, and the jth network device can Determined by the maximum number of MIMO layers scheduled by the terminal, the jth network device is any one of the S network devices.
The method according to claim 6, wherein the number of MIMO layers scheduled by the jth network device for the terminal is that the jth network device is the terminal last time. The number of MIMO layers scheduled or the maximum number of MIMO layers that the jth network device determined by the terminal last time can be scheduled for the terminal.
The method according to claim 6 or 7, wherein the terminal determines the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices that are served by the terminal, including:

Determining, by the terminal, the channel estimation result according to the reference signal sent by the K network devices, and determining, by the K network devices, a maximum number of MIMO layers that can be scheduled for the terminal;

If the terminal determines that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the terminal re-determines according to a preset algorithm. The K network devices respectively correspond to a maximum number of MIMO layers that can be scheduled for the terminal.
The method according to any one of claims 6 to 8, wherein the terminal separately transmits the corresponding MIMO layer number adjustment information to the S network devices of the K network devices, including:

The terminal sends a corresponding acknowledgement ACK message or a non-acknowledgement NACK message to the S network devices, where the dj message or NACK message corresponding to the jth network device carries the jth network device can be the terminal The maximum number of MIMO layers scheduled or the amount of MIMO layer adjustment corresponding to the jth network device.
A method for determining the number of MIMO layers, comprising:

Receiving, by the network device, the first message modulated by the terminal by using the first modulation mode;

Determining, by the network device, the first preset value corresponding to the first modulation mode and the first message according to the modulation mode, the correspondence between the message type and the preset value, and the number of MIMO layers scheduled for the terminal Adjusting the first preset value;

or,

Receiving, by the network device, a second message that is modulated by the terminal by using the first modulation mode;

Determining, by the network device, the second preset value corresponding to the first modulation mode and the first message according to the modulation mode, the correspondence between the message type and the preset value, and scheduling the MIMO for the terminal Adjusting the second preset value by the number of layers;

The first preset value is a positive integer, and the second preset value is a negative integer.
The method of claim 10, further comprising:

Receiving, by the network device, the first message that is modulated by the terminal by using a second modulation manner;

Determining, by the network device, a third preset value corresponding to the second modulation mode and the first message according to the modulation mode, the correspondence between the message and the preset value, where the network device is not adjusted to The number of MIMO layers scheduled by the terminal;

or,

Receiving, by the network device, the second message that is modulated by the terminal by using a second modulation manner;

Determining, by the network device, the third preset value corresponding to the second modulation mode and the second message according to the modulation mode, the correspondence between the message and the preset value, where the network device does not adjust The number of MIMO layers scheduled for the terminal;

The third preset value is 0.
The method according to claim 11, wherein when the first message is an ACK message, the second message is a NACK message, and when the first message is a NACK message, the second message is ACK message;

When the first modulation mode is binary phase shift keying BPSK, the second modulation mode is orthogonal binary phase shift keying QBPSK, and when the first modulation mode is QBPSK, the second modulation mode is BPSK.
A method for determining the number of MIMO layers, comprising:

The network device receives the MIMO layer number adjustment information sent by the terminal;

The MIMO layer number adjustment information carries a maximum number of MIMO layers that the network device can schedule for the terminal, or a MIMO layer number adjustment amount corresponding to the network device, and a MIMO layer number adjustment amount corresponding to the network device. Determining, by the terminal, the number of MIMO layers scheduled by the network device for the terminal, and the maximum number of MIMO layers that the network device can schedule for the terminal according to the terminal;

The network device adjusts the number of MIMO layers scheduled by the terminal according to the MIMO layer number adjustment information.
The method according to claim 13, wherein the number of MIMO layers scheduled by the network device for the terminal is the number of MIMO layers scheduled by the network device for the terminal at a time or The maximum number of MIMO layers that the network device determined by the terminal last time can be scheduled for the terminal.
The method according to claim 13 or 14, wherein the network device receives the MIMO layer number adjustment information sent by the terminal, including:

Receiving, by the network device, an ACK message or a NACK message sent by the terminal, where the ACK message or the NACK message carries a maximum number of MIMO layers that the network device can schedule for the terminal or a MIMO corresponding to the network device The number of layers is adjusted.
A terminal, comprising: a memory, a processor and a transceiver, wherein:

The memory stores instructions;

The transceiver is configured to communicate with the network device;

The processor is configured to invoke an instruction stored by the memory, and perform the following operations when the instruction is executed:

Determining a maximum number of MIMO layers that can be scheduled for the terminal by the K network devices serving the terminal, wherein the K network devices respectively have the largest number of MIMO layers that can be scheduled for the terminal The sum of the values is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is greater than or equal to a positive integer of 2;

When it is determined that the MIMO layer number adjustment amount corresponding to the i th network device is greater than or equal to the first preset value, sending, by using the first modulation mode, the first message to the i th a network device, configured to adjust, by the i-th network device, the first preset value for a number of MIMO layers scheduled by the terminal;

When it is determined that the MIMO layer number adjustment amount corresponding to the ith network device is less than or equal to the second preset value, sending, by using the first modulation mode, the second message to the transceiver The i-th network device, so that the i-th network device adjusts the second preset value for the number of MIMO layers scheduled by the terminal;

The MIMO layer number adjustment amount corresponding to the ith network device is the MIMO layer number and the ith network scheduled by the terminal according to the i th network device known by the terminal for the terminal. The device is configured to determine a maximum number of MIMO layers scheduled by the terminal, where the first preset value is a positive integer, the second preset value is a negative integer, and the i th network device is the K Any network device in the network device, i is a positive integer less than or equal to K.
The terminal according to claim 16, wherein the processor is further configured to:

Determining that the MIMO layer number adjustment amount corresponding to the i th network device is greater than the number after determining that the K network devices serving the terminal respectively are capable of being the maximum number of MIMO layers scheduled by the terminal When the second preset value is smaller than the first preset value, the first message or the second message modulated by the second modulation mode is sent to the i th network device through the transceiver, so that the The i-th network device does not adjust the number of MIMO layers scheduled for the terminal.
The terminal according to claim 17, wherein when the first message is an ACK message, the second message is a NACK message, and when the first message is a NACK message, the second message is ACK message;

When the first modulation mode is binary phase shift keying BPSK, the second modulation mode is orthogonal binary phase shift keying QBPSK, and when the first modulation mode is QBPSK, the second modulation mode is BPSK.
The terminal according to any one of claims 16 to 18, wherein the processor determines a maximum number of MIMO layers that can be scheduled for the terminal corresponding to the K network devices serving the terminal respectively. When specifically used to:

Determining, according to a result of performing channel estimation by the reference signals respectively sent by the K network devices, determining a maximum number of MIMO layers that the K network devices respectively can be scheduled for the terminal;

If it is determined that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the K network devices are re-determined according to a preset algorithm. Corresponding respectively, the maximum number of MIMO layers that can be scheduled for the terminal.
The terminal according to any one of claims 16 to 19, wherein the number of MIMO layers scheduled by the i-th network device that is known by the terminal is the i-th network device. The number of MIMO layers scheduled for the terminal at a time or the maximum number of MIMO layers that the i-th network device determined by the terminal last time can be scheduled for the terminal.
A terminal, comprising: a memory, a processor, and a transceiver, wherein

The memory stores instructions;

The processor is configured to invoke a memory storage instruction, and when the instruction is executed, perform the following operations:

Determining that the K network devices serving the terminal respectively can be scheduled for the terminal a maximum number of MIMO layers, wherein the total of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is less than or equal to the maximum number of MIMO layers that the terminal can process, and K is greater than or a positive integer equal to 2;

The transceiver is configured to separately send corresponding MIMO layer number adjustment information to S network devices in the K network devices, S≤K;

The MIMO layer number adjustment information corresponding to the jth network device carries the maximum number of MIMO layers that the jth network device can schedule for the terminal or the MIMO layer number adjustment corresponding to the jth network device, The MIMO layer number adjustment amount corresponding to the jth network device is a MIMO layer number that the terminal schedules for the terminal according to the jth network device known by the terminal, and the jth network device can Determined by the maximum number of MIMO layers scheduled by the terminal, the jth network device is any one of the S network devices.
The terminal according to claim 21, wherein the number of MIMO layers scheduled by the jth network device for the terminal is that the jth network device is the terminal last time. The number of MIMO layers scheduled or the maximum number of MIMO layers that the jth network device determined by the terminal last time can be scheduled for the terminal.
The terminal according to claim 21 or 22, wherein when the processor determines that the K network devices serving the terminal respectively correspond to the maximum number of MIMO layers that can be scheduled by the terminal, Used for:

Determining, according to a result of performing channel estimation by the reference signals respectively sent by the K network devices, determining a maximum number of MIMO layers that the K network devices respectively can be scheduled for the terminal;

If it is determined that the sum of the maximum number of MIMO layers that can be scheduled for the terminal by the K network devices is greater than the maximum number of MIMO layers that the terminal can process, the terminal re-determines the K according to a preset algorithm. Each of the network devices corresponds to a maximum number of MIMO layers that can be scheduled for the terminal.
The terminal according to any one of claims 21 to 23, wherein when the transceiver separately transmits the corresponding MIMO layer number adjustment information to the S network devices of the K network devices, the method is specifically configured to:

Sending a corresponding acknowledgement ACK message or a non-acknowledgement NACK message to the S network devices, where the ACK message or the NACK message corresponding to the jth network device carries the MIMO that the jth network device can schedule for the terminal The maximum number of layers or the amount of MIMO layer adjustment corresponding to the jth network device.
A network device, comprising: a memory, a processor, and a transceiver, wherein

The memory stores instructions;

The transceiver is configured to receive a first message modulated by the terminal by using a first modulation manner;

The processor is configured to invoke an instruction stored by the memory, and perform the following operations when the instruction is executed:

Determining, according to a modulation mode, a correspondence between the message type and the preset value, a first preset value corresponding to the first modulation mode and the first message, and adjusting the number of MIMO layers scheduled for the terminal a preset value;

or,

The transceiver is configured to receive a second message that is modulated by the terminal by using the first modulation mode;

The processor is configured to invoke an instruction stored by the memory, and perform the following operations when the instruction is executed:

Determining, according to the modulation mode, the correspondence between the message type and the preset value, a second preset value corresponding to the first modulation mode and the second message, and adjusting the number of MIMO layers scheduled for the terminal Second preset value;

The first preset value is a positive integer, and the second preset value is a negative integer.
The network device according to claim 25, wherein the transceiver is further configured to receive the first message modulated by the terminal by using a second modulation mode;

The processor is further configured to determine, according to the modulation mode, the correspondence between the message and the preset value, a third preset value corresponding to the second modulation mode and the first message, where the network device Not adjusting the number of MIMO layers scheduled for the terminal;

or,

The transceiver is further configured to receive the second message that is modulated by the terminal by using a second modulation manner;

The processor is further configured to determine, according to the modulation mode, the correspondence between the message and the preset value, the third preset value corresponding to the second modulation mode and the second message, The network device does not adjust the number of MIMO layers scheduled for the terminal;

The third preset value is 0.
The network device according to claim 26, wherein when the first message is an ACK message, the second message is a NACK message, and when the first message is a NACK message, the second message For ACK message;

When the first modulation mode is binary phase shift keying BPSK, the second modulation mode is orthogonal binary phase shift keying QBPSK, and when the first modulation mode is QBPSK, the second modulation mode is BPSK.
A network device, comprising: a memory, a processor, and a transceiver, wherein

The memory stores instructions;

The transceiver is configured to receive MIMO layer number adjustment information sent by the terminal;

The MIMO layer number adjustment information carries a maximum number of MIMO layers that the network device can schedule for the terminal, or a MIMO layer number adjustment amount corresponding to the network device, and a MIMO layer number adjustment amount corresponding to the network device. Determining, by the terminal, the number of MIMO layers scheduled by the network device for the terminal, and the maximum number of MIMO layers that the network device can schedule for the terminal according to the terminal;

The processor is configured to invoke an instruction stored by the memory, and perform the following operations when the instruction is executed:

Adjusting the number of MIMO layers scheduled for the terminal according to the MIMO layer number adjustment information.
The network device according to claim 28, wherein the number of MIMO layers scheduled by the network device for the terminal is the number of MIMO layers scheduled by the network device for the terminal Or the maximum number of MIMO layers that the network device determined by the terminal last time can be scheduled for the terminal.
The network device according to claim 28 or 29, wherein when the transceiver receives the MIMO layer number adjustment information sent by the terminal, the transceiver is specifically configured to:

Receiving an ACK message or a NACK message sent by the terminal, where the ACK message or the NACK message carries a maximum number of MIMO layers that the network device can schedule for the terminal or a MIMO layer number adjustment corresponding to the network device .