WO2020030112A1

WO2020030112A1 - Data transmission method and apparatus

Info

Publication number: WO2020030112A1
Application number: PCT/CN2019/099988
Authority: WO
Inventors: 黄雯雯; 花梦; 铁晓磊
Original assignee: 华为技术有限公司
Priority date: 2018-08-10
Filing date: 2019-08-09
Publication date: 2020-02-13

Abstract

Provided by the present application are a data transmission method and apparatus. The method comprises: receiving a first DCI transmitted by a network device, the first DCI comprising the number of layers for transmitting first data through a PDSCH, the number of layers for the first data is less than or equal to N1 under a first condition; under a second condition, the number of layers for the first data being less than or equal to N2, wherein N1 <N2, N2 being the maximum number of layers for data transmission by the PDSCH that is supported by the terminal device, N1 being a positive integer; and receiving the first data transmitted by the network device, and demodulating the first data according to the first DCI. Therefore, when receiving the first data transmitted by the network device via the PDSCH, the terminal device can enable fewer receiving antennas under the first condition, which can save the RF power consumption of the terminal device; under the second condition, more receiving antennas can be enabled, and the receiving antennas can be dynamically adjusted, thereby saving radio frequency power consumption of the terminal device.

Description

Data transmission method and device

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China on January 11, 2019, with application number 201910028357.3, and with the application name of "Data Transmission Method and Device"; requested to be submitted to China on August 10, 2018 The priority of a Chinese patent application of the State Intellectual Property Office, application number 201810911048.6, and application name "Data Transmission Method and Device", the entire contents of which are incorporated herein by reference.

Technical field

The present application relates to the field of communication technologies, and in particular, to a data transmission method and device.

Background technique

In mobile communication systems, the power consumption of terminal equipment is an important aspect of user experience. 3GPP Release 16 proposed to optimize the power consumption of terminal equipment in New Radio (NR). The number of antennas affects the RF power consumption of terminal equipment. The more antennas a device operates, the greater the RF power consumption.

In NR, the terminal device can report the maximum number of physical downlink shared channel (PDSCH) layers to the network device. The maximum number of layers can be 2, 4, or 8. The number of layers for network device scheduling PDSCH cannot exceed the terminal. The maximum number of layers reported by the device. Network equipment configures dedicated demodulation reference signals (DMRS) parameters for terminal equipment through radio resource control (RRC) signaling. The parameters of DMRS include DMRS type and DMRS maximum orthogonal frequency division multiplexing. (Orthogonal Frequency Division Multiplexing, OFDM) symbols and other parameters, these parameters correspond to a group of antenna port configuration, different parameters correspond to different antenna port configurations, in NR the PDSCH antenna port and the number of layers corresponds one-to-one. When the network device sends data to the terminal device, the network device first indicates downlink scheduling information and a value for indicating the antenna port (layer number) to the terminal device through downlink control information (DCI). The terminal device receives the PDSCH. The number of antennas must be greater than or equal to the number of layers in the PDSCH. The antenna port configuration includes the corresponding relationship between the number and the antenna port (number of layers). For example, when the value in the DCI is 10, the number of antenna ports corresponding to the number 10 is 4 (DMRS port 0 ~ 3), it means that layer 4 is currently scheduled, and the terminal device must receive PDSCH with at least 4 receiving antennas; when the value in the DCI is 0, the number of antenna ports corresponding to the value 0 is 1 (DMRS port 0), It means that layer 1 is currently scheduled, and the terminal device can receive PDSCH with one receiving antenna. In addition, the downlink scheduling information includes PDSCH time / frequency domain resource allocation information, and the time domain resource allocation information refers to a scheduled PDSCH start position and length. The network device sends the DCI through a physical downlink control channel (Physical downlink control channel, PDCCH).

According to the above description, the terminal device needs to complete DCI decoding to know the number of PDSCH layers to be scheduled. In some scenarios, such as slot scheduling, that is, the network device sends PDSCH and PDCCH to the terminal device at the same time. Before the DCI decoding is completed, the data sent by the network device through the PDSCH must be buffered. The terminal device is not yet sure of the number of PDCSH layers scheduled by the network device and can only buffer the data according to the larger number of receiving antennas. For example, the PDSCH scheduled by DCI is 1. Layer, but at this time the terminal equipment must use 4 receiving antennas to buffer data. The number of antennas affects radio frequency power consumption. When a terminal device turns on multiple receiving antennas at the same time, the radio frequency power consumption of the terminal device is wasted.

Summary of the invention

The present application provides a data transmission method and device, which can save radio frequency power consumption of a terminal device.

In a first aspect, the present application provides a data transmission method, including:

Receive first downlink control information DCI sent by a network device, the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH, and under a first condition, the number of layers for the first data is less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers of data transmitted through the PDSCH supported by the terminal device, and N1 is a positive integer;

Receiving first data sent by the network device, and demodulating the first data according to the first DCI.

According to the data transmission method provided in the first aspect, when the network device has data to send, the first DCI is first sent to the terminal device. The first DCI includes the number of layers for transmitting the first data through the PDSCH. Under the first condition, the first data The number of layers is less than or equal to N1. Under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, and N2 is the maximum number of layers supported by the terminal device for transmitting data through PDSCH. Therefore, the terminal device is receiving When the network device sends the first data through the PDSCH, under the first condition, fewer receiving antennas can be opened, which can save radio frequency power consumption of the terminal device. Under the second condition, when receiving the first data sent by the network device through the PDSCH, the terminal device can open more receiving antennas, and the receiving antenna can be dynamically adjusted, thereby saving radio frequency power consumption of the terminal device.

In a possible design, the first DCI further includes a time slot offset of the first data in time, where:

When the number of layers of the first data is less than or equal to N1, the slot offset is less than a preset value;

When the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the slot offset is greater than or equal to the preset value.

In a possible design, under the second condition, the number of layers of the first data is less than or equal to N2, and the first data sent by the network device is received, and the first data is demodulated according to the first DCI. After the first data is described, the method further includes:

Start a timer to start counting from the time slot where the first data is located;

No data sent through the PDSCH is received within the preset X time slots, and when the timer times out, the number of layers receiving the second data sent by the network device through the PDSCH is less than or equal to N1; or,

When the third data sent by the network device through the PDSCH is received in preset X time slots, the timer restarts.

With the data transmission method provided in this embodiment, after the terminal device opens N2 receiving antennas to receive the first data of the network device, the terminal device can fall back to work with less than or equal to N1 receiving antennas by setting a timer, thereby saving End device power consumption.

Start a timer to start counting from the position where the first DCI is located;

The second DCI is not received within the preset X time slots, and when the timer expires, the number of layers receiving the second data sent by the network device through the PDSCH is less than or equal to N1; or,

When the second DCI is received within preset X time slots, the timer re-times, where the second DCI includes the number of layers of the third data transmitted through the PDSCH.

In a possible design, when the second data sent by the network device through the PDSCH is received within a preset X time slots, the timer restarts, including:

If the number of layers of the second data is greater than the number of first preset layers, the timer restarts;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, the third data received by the network device through the PDSCH is received. The number of layers of data is less than or equal to N1.

In a possible design, when the second DCI is received within a preset X timeslots, the timer restarts, including:

If the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the timer restarts;

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, the network device is received by the network device through the The number of layers of the third data sent by the PDSCH is less than or equal to N1.

When the number of layers of the second data is less than the second preset layer number is equal to a preset threshold, then the number of layers receiving the third data sent by the network device through the PDSCH is less than or equal to N1, the preset threshold Is a positive integer.

With the data transmission method provided in this embodiment, after the terminal device opens N2 receiving antennas to receive the first data of the network device, the terminal device can fall back to work with less than or equal to N1 receiving antennas by setting the counting device, thereby saving End device power consumption.

In a possible design, after the number of layers of the first data is less than or equal to N2, after receiving the first data sent by the network device and demodulating the first data according to the first DCI, The method further includes:

Receiving indication information sent by the network device and used to indicate that the number of layers receiving second data sent by the network device through the PDSCH is less than or equal to N1.

With the data transmission method provided in this embodiment, after the terminal device opens N2 receiving antennas to receive the first data of the network device, the terminal device can fall back to work with less than or equal to N1 receiving antennas through the instruction information of the network device, thereby Save power consumption of terminal equipment.

In a possible design, the method further includes:

Receiving a channel state information reference signal CSI-RS sent by the network device;

Calculate the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and send the first CQI and / or the second CQI to the network device.

With the data transmission method provided in this embodiment, the terminal device calculates the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and sends the first CQI and / or to the network device. The second CQI solves the problem of how the terminal device reports the CQI to the network device when the receiving antenna is dynamically adjusted under different conditions, and the network device can obtain an accurate CQI, thereby determining the MCS of the data sent through the PDSCH according to the CQI.

In a possible design, the method further includes:

When the time unit where the CSI-RS resource is located receives the first data sent by the network device, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.

In a second aspect, the present application provides a data transmission method, including:

Send first downlink control information DCI to a terminal device, where the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH, and under a first condition, the number of layers for the first data is less than or equal to N1 ; Under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is a maximum number of layers of data supported by the terminal device for transmitting data through PDSCH, and N1 is a positive integer;

Sending first data to the terminal device.

According to the data transmission method provided in the second aspect, when the network device has data to send, the first DCI is first sent to the terminal device. The first DCI includes the number of layers for transmitting the first data through the PDSCH. Under the first condition, the first data The number of layers is less than or equal to N1. Under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, and N2 is the maximum number of layers supported by the terminal device for transmitting data through PDSCH. When the network device sends the first data through the PDSCH, under the first condition, fewer receiving antennas can be opened, which can save radio frequency power consumption of the terminal device. Under the second condition, when receiving the first data sent by the network device through the PDSCH, the terminal device can open more receiving antennas, and the receiving antenna can be dynamically adjusted, thereby saving radio frequency power consumption of the terminal device.

In a possible design, under the second condition, the number of layers of the first data is less than or equal to N2, and after the sending the first data to the terminal device, the method further includes:

Data is not sent to the terminal device through the PDSCH within the preset X time slots, and when the timer expires, the number of layers for sending second data to the terminal device through the PDSCH is less than or equal to N1 ;or,

When the third data is sent to the terminal device through the PDSCH within the preset X time slots, the timer restarts.

The second DCI is not sent to the terminal device within the preset X time slots, and when the timer expires, the number of layers for sending the second data to the terminal device through the PDSCH is less than or equal to N1; or ,

When the second DCI is sent to the terminal device within preset X time slots, the timer is re-timed, where the second DCI includes the number of layers of the third data transmitted through the PDSCH.

In a possible design, when the second data is sent to the terminal device through the PDSCH within a preset X timeslots, the timer restarts, including:

If the number of layers of the second data is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, third data is sent to the terminal device through the PDSCH. The number of layers is less than or equal to N1.

In a possible design, when the second DCI is sent to the terminal device within a preset X time slots, the timer restarts, including:

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, the terminal is notified to the terminal through the PDSCH. The number of layers in which the device sends the third data is less than or equal to N1.

When the number of layers of the second data is less than the second preset layer number is equal to the preset threshold, the number of layers of the third data sent to the terminal device through the PDSCH is less than or equal to N1, and the preset threshold is Positive integer.

With the data transmission method provided in this embodiment, after the terminal device opens N2 receiving antennas to receive the first data of the network device, through the setting of the counting device, the terminal device can fall back to work with less than or equal to N1 receiving antennas, thereby saving End device power consumption.

And sending, to the terminal device, instruction information used to indicate that the number of layers for sending second data to the terminal device through the PDSCH is less than or equal to N1.

In a possible design, the method further includes:

Sending a channel state information reference signal CSI-RS to the terminal device, for the terminal device to calculate the first channel quality information CQI under the first condition and the first channel quality information CQI under the second condition according to the CSI-RS. Two CQI;

Receiving a first CQI and / or a second CQI sent by the terminal device.

In a possible design, the method further includes:

When sending the first data to the terminal device in a time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.

In a third aspect, the present application provides a terminal device, including:

A first receiving module is configured to receive first downlink control information DCI sent by a network device, where the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH. Under a first condition, the first The number of layers of data is less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers of data transmitted through the PDSCH supported by the terminal device, N1 Is a positive integer;

A second receiving module is configured to receive first data sent by the network device, and demodulate the first data according to the first DCI.

In a possible design, under the second condition, the terminal device further includes:

A first timing module, configured to start a timer after the second receiving module receives first data sent by the network device and demodulate the first data according to the first DCI, and The time slot where the data is located starts to count;

The second receiving module does not receive data sent through the PDSCH within the preset X time slots, and when the timer times out, the second receiving module receives the network device sending through the PDSCH The number of layers of the second data is less than or equal to N1; or,

When the second receiving module receives the third data sent by the network device through the PDSCH within preset X time slots, the first timing module retimes the timer.

A second timing module, configured to start a timer after the second receiving module receives the first data sent by the network device and demodulates the first data according to the first DCI, and DCI starts timing;

The second receiving module does not receive the second DCI within the preset X time slots. When the timer expires, the second receiving module receives the second data sent by the network device through the PDSCH. Is less than or equal to N1; or,

When the second receiving module receives the second DCI within preset X time slots, the timer is re-timed, wherein the second DCI includes the number of layers of the third data transmitted through the PDSCH. .

In a possible design, if the number of layers of the second data is greater than the number of first preset layers, the first time counting module retimes the timer;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the first timing module continues counting the timer, and when the timer times out, the second receiving module The number of layers receiving the third data sent by the network device through the PDSCH is less than or equal to N1.

In a possible design, if the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the second timing module re-times the timer;

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the second timing module continues counting the timer, and when the timer times out, all the The number of layers in which the second receiving module receives third data sent by the network device through the PDSCH is less than or equal to N1.

In a possible design, under the second condition, when the number of times the second data is less than the second preset number of times is equal to a preset threshold, the second receiving module receives the network device The number of layers of the third data sent by the PDSCH is less than or equal to N1, and the preset threshold is a positive integer.

A third receiving module, configured to receive the first data sent by the network device after the second receiving module receives the first data sent by the network device and demodulate the first data according to the first DCI; And indication information indicating that the number of layers receiving second data sent by the network device through the PDSCH is less than or equal to N1.

In a possible design, the terminal device further includes:

A fourth receiving module, configured to receive a channel state information reference signal CSI-RS sent by the network device;

A processing module, configured to calculate the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and send the first CQI and / or the first CQI to the network device Two CQI.

In a possible design, when receiving the first data sent by the network device in a time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the first data The number of layers is less than or equal to N2.

For the beneficial effects of the fourth aspect and the network devices provided in the possible designs of the fourth aspect, reference may be made to the beneficial effects brought by the foregoing second aspect and the possible implementation manners of the second aspect. More details.

In a fourth aspect, the present application provides a network device, including:

A first sending module, configured to send first downlink control information DCI to a terminal device, where the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH, and under the first condition, the first data The number of layers is less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers supported by the terminal device for transmitting data through PDSCH, and N1 is Positive integer

A second sending module, configured to send first data to the terminal device.

In a possible design, under the second condition, the network device further includes:

A first timing module, configured to start a timer after the second sending module sends the first data to the terminal device, and start timing from the time slot where the first data is located;

If the second sending module fails to send data to the terminal device through the PDSCH within the preset X time slots, and the timer expires, the second sending module sends the first to the terminal device through the PDSCH. The number of data layers is less than or equal to N1; or,

When the second sending module sends third data to the terminal device through the PDSCH within preset X time slots, the first timing module re-times the timer.

A second timing module, configured to start a timer after the second sending module sends the first data to the terminal device, and start timing from the position where the first DCI is located;

The second sending module does not send the second DCI to the terminal device within the preset X time slots. When the timer times out, the second sending module sends the terminal device to the terminal device through the PDSCH. The number of layers of the second data is less than or equal to N1; or

When the second sending module sends a second DCI to the terminal device within a preset X time slots, the second timing module re-times the timer, where the second DCI includes The number of layers of the third data transmitted by the PDSCH is described.

In a possible design, if the number of layers of the second data is greater than the number of first preset layers, the first timing module retimes the timer;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the first timing module continues counting the timer, and when the timer times out, the second sending module The number of layers that send third data to the terminal device through the PDSCH is less than or equal to N1.

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the second timing module continues counting the timer, and when the timer times out, all the The second sending module sends the third data to the terminal device through the PDSCH in a number of layers less than or equal to N1

In a possible design, under the second condition, when the number of times the second data layer is less than the second preset layer number is equal to a preset threshold, the second sending module sends the data to the PDSCH through the PDSCH. The number of layers in which the terminal device sends the third data is less than or equal to N1, and the preset threshold is a positive integer.

A third sending module, configured to send, after the second sending module sends the first data to the terminal device, the number of layers used to instruct the terminal device to send the second data to the terminal device through the PDSCH The instruction information is less than or equal to N1.

In a possible design, the network device further includes:

A fourth sending module is configured to send a channel state information reference signal CSI-RS to the terminal device, and is used by the terminal device to calculate the first channel quality information CQI and the first channel quality information under the first condition according to the CSI-RS. The second CQI under the second condition;

A receiving module, configured to receive a first CQI and / or a second CQI sent by the terminal device.

In a possible design, when sending the first data to the terminal device in a time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the The number of layers is less than or equal to N2.

In a fifth aspect, the present application provides a data transmission method, including:

Obtaining the maximum number of PDSCH layers of the physical downlink shared channel on the carrier or bandwidth part BWP;

Receiving downlink control information DCI sent by a network device, where the DCI includes the number of layers that send data through the PDSCH;

Receive data sent by the network device through the PDSCH on the target carrier or the target BWP, and demodulate the data according to the DCI, the number of layers of the data is less than or equal to the maximum PDSCH layer on the target carrier or the target BWP number.

According to the data transmission method provided in the fifth aspect, by configuring the maximum number of PDSCH layers for each carrier or carrier group, or configuring the maximum number of PDSCH layers for each BWP or BWP group, the terminal device receives the PDSCH transmitted on the corresponding carrier or BWP. When data is transmitted, the corresponding number of receiving antennas can be opened according to the configured maximum number of layers of PDSCH. When receiving data sent by PDSCH on some carriers or BWP, fewer receiving antennas can be opened, which can save the RF power consumption of the terminal device. .

In a possible design, the obtaining the maximum number of layers of the physical downlink shared channel PDSCH on the carrier or bandwidth part BWP includes:

Obtain carrier configuration information or BWP configuration information, where the carrier configuration information includes the maximum number of PDSCH layers of each carrier, or the carrier configuration information includes at least one PDSCH maximum layer number, and one PDSCH maximum layer number is used to indicate a group The maximum number of PDSCH layers of the carrier. The BWP configuration information includes the maximum number of PDSCH layers on each BWP. Alternatively, the BWP configuration information includes at least one maximum PDSCH layer. One maximum PDSCH layer indicates a group. Maximum number of PDSCH layers on BWP;

Acquiring the maximum number of PDSCH layers of each carrier according to the carrier configuration information, or acquiring the maximum number of PDSCH layers on each BWP according to the BWP configuration information.

In a sixth aspect, the present application provides a data transmission method, including:

Configure the maximum number of layers of the physical downlink shared channel PDSCH on the carrier or bandwidth part BWP for the terminal device;

Sending downlink control information DCI to the terminal device, where the DCI includes the number of layers that send data through the PDSCH;

Send data to the terminal device through the PDSCH on the target carrier or the target BWP, and the number of data layers is less than or equal to the maximum number of PDSCH layers on the target carrier or the target BWP.

According to the data transmission method provided in the sixth aspect, by configuring the maximum number of PDSCH layers for each carrier or carrier group, or configuring the maximum number of PDSCH layers for each BWP or BWP group, the terminal device receives the PDSCH transmitted on the corresponding carrier or BWP. When data is transmitted, the corresponding number of receiving antennas can be opened according to the configured maximum number of layers of PDSCH. When receiving data sent by PDSCH on some carriers or BWP, fewer receiving antennas can be opened, which can save the RF power consumption of the terminal device. .

In a possible design, configuring the maximum number of layers of the physical downlink shared channel PDSCH on the carrier or bandwidth part BWP for the terminal device includes:

The carrier device or the BWP configuration information is used to configure the carrier or the maximum number of PDSCH layers on the BWP for the terminal device. The carrier configuration information includes the maximum number of PDSCH layers of the carrier. Maximum number of layers, one PDSCH maximum layer is used to indicate the maximum number of PDSCH layers of a group of carriers, the BWP configuration information includes the maximum number of PDSCH layers on each BWP, or the BWP configuration information includes at least one PDSCH Maximum number of layers. One PDSCH maximum layer number is used to indicate the maximum number of PDSCH layers on a group of BWPs.

In a seventh aspect, the present application provides a terminal device, including:

An obtaining module, configured to obtain a maximum number of layers of a physical downlink shared channel PDSCH on a carrier or a bandwidth part BWP;

A first receiving module, configured to receive downlink control information DCI sent by a network device, where the DCI includes a number of layers for sending data through a PDSCH;

A second receiving module, configured to receive data sent by the network device through a PDSCH on a target carrier or a target BWP, and demodulate the data according to the DCI, and the number of layers of the data is less than or equal to the target carrier or Maximum number of PDSCH layers on the target BWP.

In a possible design, the obtaining module is used for:

For the beneficial effects of the seventh aspect and the network devices provided in the possible designs of the seventh aspect, reference may be made to the beneficial effects brought by the foregoing fifth aspect and the possible implementation manners of the fifth aspect. More details.

In an eighth aspect, the present application provides a network device, including:

A configuration module configured to configure a maximum number of layers of a physical downlink shared channel PDSCH on a carrier or a bandwidth part BWP for a terminal device;

A first sending module, configured to send downlink control information DCI to the terminal device, where the DCI includes a number of layers for sending data through a PDSCH;

The second sending module is configured to send data to the terminal device through the PDSCH on the target carrier or the target BWP, where the number of data layers is less than or equal to the maximum number of PDSCH layers on the target carrier or the target BWP.

In a possible design, the configuration module is configured to:

The carrier device or the BWP configuration information is used to configure the carrier or the maximum number of PDSCH layers on the BWP for the terminal device. The carrier configuration information includes the maximum number of PDSCH layers of the carrier, or the carrier configuration information includes at least one PDSCH. The maximum number of layers. One PDSCH maximum layer number is used to indicate the maximum number of PDSCH layers of a group of carriers. The BWP configuration information includes the maximum number of PDSCH layers on each BWP, or the BWP configuration information includes at least one PDSCH. Maximum number of layers. One PDSCH maximum layer number is used to indicate the maximum number of PDSCH layers on a group of BWPs.

For the beneficial effects of the eighth aspect and the network devices provided in the possible designs of the eighth aspect, refer to the beneficial effects brought by the foregoing sixth aspect and the possible implementation manners of the sixth aspect. More details.

In a ninth aspect, the present application provides a terminal device, including: a memory and a processor;

Memory for storing program instructions;

The processor is configured to call a program instruction in the memory to execute the data transmission method in the first aspect and any possible design of the first aspect or the fifth aspect and any possible design of the fifth aspect.

In a tenth aspect, the present application provides a network device, including: a memory and a processor;

Memory for storing program instructions;

The processor is configured to call program instructions in the memory to execute the data transmission method in the second aspect and any one of the possible designs of the second aspect or the sixth aspect and any of the six possible designs in the sixth aspect.

In an eleventh aspect, the present application provides a readable storage medium that stores an execution instruction. When the at least one processor of the terminal device executes the execution instruction, the terminal device executes the first aspect and any of the first aspect. A data transmission method in one possible design or in the fifth aspect and any one of the fifth possible designs.

In a twelfth aspect, the present application provides a readable storage medium that stores an execution instruction. When the at least one processor of the network device executes the execution instruction, the network device executes any of the second aspect and the second aspect. A data transmission method in a possible design or in the sixth aspect and any one of the possible designs of the sixth aspect.

In a thirteenth aspect, the present application provides a program product including an execution instruction, and the execution instruction is stored in a readable storage medium. At least one processor of the terminal device may read the execution instruction from a readable storage medium, and the execution of the execution instruction by the at least one processor causes the terminal device to implement the first aspect and any possible design of the first aspect or the fifth aspect and The data transmission method in any possible design of the fifth aspect.

In a fourteenth aspect, the present application provides a program product including an execution instruction, and the execution instruction is stored in a readable storage medium. At least one processor of the network device may read the execution instruction from a readable storage medium, and the execution of the execution instruction by the at least one processor causes the network device to implement the second aspect and any possible design of the second aspect or the sixth aspect and A data transmission method in any possible design of the sixth aspect.

In a fifteenth aspect, the present application provides a chip on which a computer program is stored, and when the computer program is executed by the chip, the first aspect, the second aspect, the fifth aspect, and the sixth aspect are implemented Or the methods in various possible implementation manners of the first aspect, the second aspect, the fifth aspect, and the sixth aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a communication system architecture;

FIG. 2 is an interaction flowchart of an embodiment of a data transmission method provided by this application;

3 is an interaction flowchart of an embodiment of a data transmission method provided by this application;

4 is an interaction flowchart of an embodiment of a data transmission method provided by this application;

FIG. 5 is a schematic diagram of a process for a terminal device to fall back to a low power consumption state from a low power consumption state to a high power consumption state provided by the present application; FIG.

6 is a flowchart of an embodiment of a data transmission method provided by this application;

7 is a schematic structural diagram of an embodiment of a terminal device provided by this application;

8 is a schematic structural diagram of an embodiment of a terminal device provided by this application;

FIG. 9 is a schematic structural diagram of an embodiment of a terminal device provided by this application;

10 is a schematic structural diagram of an embodiment of a terminal device provided by this application;

11 is a schematic structural diagram of an embodiment of a terminal device provided by this application;

FIG. 12 is a schematic structural diagram of an embodiment of a network device provided by this application;

FIG. 13 is a schematic structural diagram of an embodiment of a network device provided by this application;

14 is a schematic structural diagram of an embodiment of a network device provided by this application;

15 is a schematic structural diagram of an embodiment of a network device provided by this application;

FIG. 16 is a schematic structural diagram of an embodiment of a network device provided by this application;

17 is a schematic structural diagram of an embodiment of a terminal device provided by this application;

FIG. 18 is a schematic structural diagram of an embodiment of a network device provided by this application;

19 is a schematic structural diagram of another terminal device according to the present application;

FIG. 20 is a schematic structural diagram of another network device provided by the present application.

detailed description

The embodiments of the present application can be applied to wireless communication systems. It should be noted that the wireless communication systems mentioned in the embodiments of the present application include, but are not limited to: Narrowband Internet of Things (NB-IoT), Global Mobile Communication system (Global System for Mobile, Communications, GSM), Enhanced Data Rate GSM Evolution System (Enhanced Data Rate for GSM Evolution, EDGE), Wideband Code Division Multiple Access System (Wideband Code Division Multiple Access, WCDMA), Code Division Multiple Access 2000 system (Code Division Multiple Access) (CDMA2000), Time Division-Synchronization Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE) system, and the fifth generation of mobile communications (LTE the 5th Generation, Mobile Communication, 5G) system.

FIG. 1 is a schematic diagram of a communication system architecture. As shown in FIG. 1, the communication system of the present application may include a network device and a terminal device, and the network device and the terminal device communicate with each other. The communication device involved in this application mainly includes a network device or a terminal device. among them,

Network device: It can be a base station, or an access point, or an access network device, or it can refer to a device in the access network that communicates with a wireless terminal through one or more sectors on the air interface. The network device can be used to convert the received air frames and IP packets to each other, and serve as a router between the wireless terminal and the rest of the access network, where the rest of the access network can include an Internet Protocol (IP) network. The network equipment can also coordinate the management of the attributes of the air interface. For example, the network device can be a Global System (Global System) of Mobile Communication (GSM) or a Code Division Multiple Access (CDMA) base station (Base Transceiver Station, BTS), or it can be a Broadband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) base stations (NodeB, NB) can also be evolved base stations (Evolutional NodeB, eNB or eNodeB) in Long Term Evolution (LTE), or relay stations or access Points, or base stations in future 5G networks, such as gNB, are not limited here.

Terminal device: It can be a wireless terminal or a wired terminal. The wireless terminal can be a device that provides users with voice and / or other business data connectivity, a handheld device with a wireless connection function, or other processing equipment connected to a wireless modem. . A wireless terminal can communicate with one or more core networks via a wireless access network. The wireless terminal can be a mobile terminal, such as a mobile phone (also called a "cellular" phone) and a computer with a mobile terminal. For example, it can be portable, Pocket, handheld, computer-built or vehicle-mounted mobile devices that exchange languages and / or data with wireless access networks. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (Personal Digital Assistant, PDA) and other devices. A wireless terminal can also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a mobile station, a remote station, a remote terminal, The access terminal (Access terminal), user terminal (User terminal), user agent (User agent), user equipment (User Device or User Equipment) are not limited here.

In the prior art, during slot scheduling, the terminal device must buffer the data sent by the PDSCH through the PDSCH before completing the DCI decoding. The terminal device is not yet sure of the number of PDSCH layers scheduled by the network device, and can only use the A large number of receiving antennas buffer the data, which will cause waste of radio frequency power consumption of the terminal device. In order to solve this problem, this application provides a data transmission method and device. By dynamically adjusting the receiving antenna, under the first condition, it can be turned on. Fewer receiving antennas can save radio frequency power consumption of terminal equipment. The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

FIG. 2 is an interaction flowchart of an embodiment of a data transmission method provided in this application. In this embodiment, the interaction between a terminal device and a network device is used as an example for description. As shown in FIG. 2, the method in this embodiment may include:

S101. The network device sends a first DCI to the terminal device. The first DCI includes the number of layers for transmitting the first data through the PDSCH. Under the first condition, the number of layers for the first data is less than or equal to N1. Under the second condition, the first The number of layers of a data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers that the terminal device supports to transmit data through PDSCH, and N1 is a positive integer.

Specifically, when the network device has data to send, the first DCI is first sent to the terminal device through the PDCCH. The first DCI includes the number of layers for transmitting the first data through the PDSCH, and the first DCI also includes PDSCH time domain resource allocation information. The PDSCH time domain resource allocation information includes the time slot offset of the first data in time and the PDSCH start symbol S and length L. The slot offset and start symbol reflect the scheduling delay. In this embodiment, the value of the number of layers of the first data is different under two different conditions. Under the first condition, the number of layers of the first data is less than or equal to N1. Under the second condition, the number of layers of the first data The number is less than or equal to N2, N1 <N2, and N2 is the maximum number of layers supported by the terminal device for transmitting data through the PDSCH. Among them, N1 may be a preset value or a value configured by a network device. Optionally, N1 is equal to the number of antennas that the terminal device receives the DCI sent through the PDCCH.

Correspondingly, the terminal device receives the first DCI sent by the network device.

S102. The network device sends the first data to the terminal device.

S103. The terminal device receives the first data sent by the network device, and demodulates the first data according to the first DCI.

Specifically, the number of antennas when the terminal device receives the first data sent through the PDSCH must be greater than or equal to the number of layers of the first data. In this embodiment, the value of the number of layers of the first data is different under two different conditions. Under the first condition, the number of layers of the first data is less than or equal to N1, N1 <N2, where N2 is supported by the terminal device. The maximum number of layers of data transmitted through PDSCH, the number of antennas when the terminal device receives the first data can not exceed N1, so that the terminal device can turn off other receiving antennas, reducing the radio frequency power consumption of the terminal device, at this time the terminal device is in Low power consumption and low throughput state; under the second condition, the number of layers of the first data is less than or equal to N2, the number of antennas for receiving the first data by the terminal device may be N2, and the terminal device enters a state of high throughput and high power consumption.

In this embodiment, optionally, the first DCI further includes a time slot offset of the first data in time. When the number of layers of the first data is less than or equal to N1, the time slot offset is less than a preset value. When the number of layers of a data is changed from less than or equal to N1 to less than or equal to N2, the time slot offset is greater than or equal to a preset value. For example, when the preset value is 1, when the number of layers of the first data is less than or equal to N1, the time slot offset is less than 1, and when the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the time slot offset is Greater than or equal to 1. Specifically, the slot offset is 0 during simultaneous slot scheduling, and the slot offset is greater than 0 during inter-slot scheduling.

In this embodiment, the first condition may be any one of the following conditions: simultaneous slot scheduling, scheduling delay below a preset value, channel quality or signal-to-noise ratio below a preset value, and poor coverage, DCI does not carry scheduling information (for example, DCI does not carry downlink scheduling information) and so on.

The second condition may be any one of the following conditions: scheduling across slots, scheduling delay greater than a preset value, channel quality or signal-to-noise ratio higher than a preset value, good coverage, and DCI carrying scheduling information ( For example, DCI carries downlink scheduling information) and so on.

The following uses slot scheduling and cross-slot scheduling as examples. Under the first condition, as in slot scheduling, the time when the network device sends the first data to the terminal device through the PDSCH and the time when the network device sends the first DCI to the terminal device is In the same time slot, the terminal device must buffer the first data sent by the network device through the PDSCH before completing the DCI decoding. The terminal device is not yet sure of the number of layers of the first data scheduled by the network device. At this time, the number of layers of the first data is less than Or equal to N1, N1 <N2, the number of antennas when the terminal device receives the first data is less than the maximum number of layers N2 supported by the terminal device for transmitting data through PDSCH, the terminal device does not need to open N2 receiving antennas to receive the first data at the same time, reducing The radio frequency power consumption of the terminal equipment is reduced, and the terminal equipment is in a low power consumption state at this time. Therefore, the terminal device can turn off a part of the receiving antenna when the transmission rate is low, and only need to open fewer receiving antennas to receive data transmitted through the PDSCH, thereby reducing the radio frequency power consumption of the terminal device.

If the network device wants to switch from the first condition to the second condition, that is, the network device needs to schedule more layers than N1, the scheduling delay needs to consider the time required for the terminal device to open the receiving antenna. Therefore, cross-slot scheduling is used, that is, the network The time when the device sends the first data to the terminal device through the PDSCH and the time when the network device sends the first DCI to the terminal device are not in the same time slot. Under the second condition, when the number of layers of the first data is less than or equal to N2, the number of antennas for receiving the first data by the terminal device may be N2, and the terminal device enters a state of high throughput and high power consumption.

In an embodiment of the present application, the network device does not send a scheduling DCI, that is, the network device does not send DCI or the DCI sent by the network device does not carry downlink scheduling information. The terminal device is in the first condition. At this time, the terminal device uses N1 The receiving antenna receives and detects the PDCCH without having to turn on N2 receiving antennas at the same time, which reduces the radio frequency power consumption of the terminal device. At this time, the terminal device is in a low power consumption state. When the terminal device detects the DCI carrying the downlink scheduling information, the terminal device transitions to the second condition, that is, the N2 receiving antennas are turned on to receive the PDSCH. Before the terminal device falls back to the first condition, the terminal device can use the N2 receiving antennas. Receive and detect PDCCH.

In this embodiment, under the second condition, the number of layers of the first data is less than or equal to N2, and the terminal device opens N2 receiving antennas to receive the first data of the network device. The network device may not always send data. In order to save the terminal For the power consumption of the device, the terminal device can fall back to work with less than or equal to N1 receiving antennas. At this time, the method in this embodiment has the following four implementable modes:

As a first implementable manner, under the second condition, when the number of layers of the first data is less than or equal to N2, after S103, the method in this embodiment may further include:

S104. The terminal device starts a timer, and starts counting from the time slot where the first data is located. The data sent by the network device through the PDSCH is not received within the preset X time slots. When the timer expires, the network device is received. The number of layers of the second data sent by the PDSCH is less than or equal to N1, that is, the terminal device falls back to a low power consumption state. X may be a preset value or a value configured through a network device, and a unit of X may be another time slot unit.

At the same time, the network device also schedules the PDSCH according to low power consumption, that is, the network device starts timing from the time slot where the first data is located, and fails to send data to the terminal device through the PDSCH within the preset X time slots. Then the number of layers for sending the second data to the terminal device through the PDSCH is less than or equal to N1.

S105. When the terminal device receives the second data sent by the network device through the PDSCH within preset X time slots, the timer restarts. At the same time, when the network device sends the second data to the terminal device through the PDSCH within preset X time slots, the timer restarts. That is, when scheduling occurs in X time slots, the timer re-times, and both the terminal device and the network device re-time.

A scheduling may occur in X timeslots as a burst of data. In order to save power, the terminal device must enter a low power state as soon as possible. At this time, further, if the number of layers of the second data is greater than the first preset layer For example, the first preset number of layers is equal to N1. The first preset number of layers is limited here by way of example, and the timer is re-timed, that is, there is scheduling during the timer startup period, and the number of scheduled data layers is greater than the first. The timers of the terminal equipment and the network equipment are re-counted after a preset number of layers, otherwise the timing continues;

If the number of layers of the second data is less than or equal to the first preset number of layers, the timer continues to count, and when the timer expires, the number of layers receiving the third data sent by the network device through the PDSCH is less than or equal to N1 That is, when the timer expires, the terminal device falls back to a low power state. At the same time, the network device must also schedule the PDSCH according to low power consumption, that is, the number of layers in which the network device sends third data to the terminal device through the PDSCH is less than or equal to N1.

As a second implementable manner, under the second condition, when the number of layers of the first data is less than or equal to N2, after S103, the method in this embodiment may further include:

S104 ': The terminal device starts a timer, and starts counting from the time slot where the first DCI is located. The second DCI is not received within the preset X time slots. When the timer expires, the network device is received by the network device through the The number of layers of the second data sent by the PDSCH is less than or equal to N1, that is, the terminal device falls back to a low power consumption state.

At the same time, the network device must also schedule PDSCH according to low power consumption, that is, the network device starts timing from the time slot where the first data is located, and does not send the second DCI to the terminal device within the preset X time slots. The number of layers sending the second data to the terminal device through the PDSCH is less than or equal to N1.

S105 '. The terminal device receives the second DCI in the preset X time slots, and then the timer re-times, where the second DCI includes the number of layers of the second data transmitted through the PDSCH. At the same time, when the network device sends the second DCI to the terminal device within the preset X time slots, the timer restarts. That is, when scheduling occurs in X time slots, the timer re-times, and both the terminal device and the network device re-time.

A scheduling may occur in the X time slots as a burst of data. In order to save power, the terminal device must enter a low power state as soon as possible. At this time, further, if the number of layers of the second data indicated by the second DCI is greater than The first preset number of layers, for example, is equal to N1. The first preset number of layers is defined here as an example, and the timer is re-counted, that is, there is scheduling during the timer startup period, and the scheduled data If the number of layers is greater than the first preset number of layers, the timers of the terminal device and the network device are re-timed; otherwise, the timer continues to count;

If the number of layers of the second data indicated by the second DCI is less than or equal to the first preset number of layers, the timer continues to count, and when the timer expires, the layer receiving the third data sent by the network device through the PDSCH The number is less than or equal to N1, that is, when the timer expires, the terminal device falls back to a low power consumption state. At the same time, the network device must also schedule the PDSCH according to low power consumption, that is, the number of layers in which the network device sends third data to the terminal device through the PDSCH is less than or equal to N1.

As a third implementable manner, under the second condition, when the number of layers of the first data is less than or equal to N2, after S103, the method in this embodiment may further include:

When the number of layers of the second data is less than the second preset layer number is equal to the preset threshold, then the number of layers receiving the third data sent by the network device through the PDSCH is less than or equal to N1, and the terminal device falls back to Low power state, the preset threshold is a positive integer. At the same time, the network device must also schedule the PDSCH according to low power consumption. When the number of times of the second data layer is less than the second preset layer number is equal to the preset threshold, the PDSCH sends the third data to the terminal device through the PDSCH. The number of layers is less than or equal to N1. For example, the terminal device and the network device can set a counter, the size of the counter is 5, that is, the preset threshold is 5. After the network device schedules the PDSCH and the terminal device opens the N2 receiving antennas to receive data, the network device still has data to the terminal device. When the number of layers included in the DCI to transmit data through the PDSCH is less than the second preset layer number, for example, the second preset layer number is equal to N1, the second preset layer number is limited here by way of example, and the counter is decremented by 1. When the counter is equal to 0, the terminal device falls back to a low power consumption state, and the network device also schedules the PDSCH according to the low power consumption.

As a fourth implementable manner, under the second condition, when the number of layers of the first data is less than or equal to N2, after S103, the method in this embodiment may further include:

The network device sends, to the terminal device, instruction information used to indicate that the number of layers for sending the second data to the terminal device through the PDSCH is less than or equal to N1. That is, the network device instructs the terminal device to fall back to the low power consumption state by sending instruction information, and can display or implicitly indicate the time to fall back to the low power consumption state. Optionally, the indication information may be sent through RRC signaling, MAC CE, or DCI.

In the data transmission method provided in this embodiment, when the network device has data to send, the first DCI is first sent to the terminal device. The first DCI includes the number of layers for transmitting the first data through the PDSCH. Under the first condition, the The number of layers is less than or equal to N1. Under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, and N2 is the maximum number of layers supported by the terminal device for transmitting data through PDSCH. Therefore, the terminal device is receiving the network. When the device sends the first data through the PDSCH, under the first condition, fewer receiving antennas can be opened, which can save radio frequency power consumption of the terminal device. Under the second condition, when receiving the first data sent by the network device through the PDSCH, the terminal device can open more receiving antennas, and the receiving antenna can be dynamically adjusted, thereby saving radio frequency power consumption of the terminal device.

In the above embodiment, because the number of receiving antennas opened by the terminal device under different conditions is different, and different numbers of receiving antennas correspond to different channel quality (CQI), when the receiving antenna is dynamically adjusted under different conditions How the terminal device reports the CQI to the network device will be described in detail below with reference to FIG. 3.

FIG. 3 is an interaction flowchart of a data transmission method embodiment provided in this application. In this embodiment, the interaction between a terminal device and a network device is used as an example for description. As shown in FIG. 3, the method in this embodiment is shown in FIG. 2. Based on the method shown, it may further include:

S106. The network device sends a channel state information reference signal (Channel state information reference signal (CSI-RS) to the terminal device.

Specifically, the network device sends the CSI-RS to the terminal device on the configured CSI-RS resource.

S107. The terminal device receives the CSI-RS, and uses the CSI-RS to calculate the first channel quality information CQI under the first condition or the second CQI under the second condition.

Specifically, the terminal device calculates the CQI according to the received CSI-RS. Because the number of PDSCH layers scheduled by the network device next is not clear, the terminal device needs to calculate the CQI of two types of receiving antennas. The first CQI corresponds to the channel quality of the terminal device using N1 receiving antennas, and the second CQI corresponds to the channel quality of the terminal device using N2 receiving antennas.

S108. The terminal device sends the first CQI and / or the second CQI to the network device.

Specifically, the terminal device may send the first CQI and the second CQI to the network device; or the terminal device sends the first CQI or the second CQI to the network device, and the network device estimates the second CQI according to the received first CQI. Or the first CQI is estimated according to the received second CQI, for example, the second CQI is equal to the first CQI plus an offset; or the terminal device sends the first CQI or the second CQI to the network device according to an instruction of the network device . For example, the terminal device is instructed to feed back the first CQI or the second CQI through DCI signaling.

After the network device receives the first CQI and / or the second CQI, the MCS of the transmission data is determined according to the received CQI. Since different numbers of receiving antennas correspond to different channels, the modulation and coding modes that the network device can schedule (Modulation and Coding) Coding scheme (MCS) range will be different. For example, the MCS range that can be scheduled by N1 receiving antennas is represented as MSC set 1, the MCS range that can be scheduled by N2 receiving antennas is represented as MSC set 2, and the code rate of MCS set 1 is less than the MSC set. With a code rate of 2, MCS set 1 may be a subset of MSC set 2. The network device indicates the MCS of the data sent through the PDSCH through the DCI.

The terminal device receives DCI and receives data transmitted through PDSCH. If the scheduling delay indicated by DCI is large, such as cross-slot scheduling, the terminal device opens N2 receiving antennas to receive data transmitted through PDSCH. For details, see S101 ～ S103.

In this embodiment, optionally, when receiving the first data sent by the network device through the PDSCH in the time unit where the CSI-RS resource is located, if the number of antenna ports configured by the CSI-RS resource is greater than N1, the number of layers of the first data is less than Or equal to N2. Specifically, the network device configures the CSI-RS resource configuration, the CSI reporting configuration, and the CSI measurement configuration through radio resource control (Radio Resource Control (RRC) signaling), and the network device sends the CSI-RS to the terminal device on the configured CSI-RS resource. RS. Among them, the number of antenna ports of the CSI-RS resource is configured in the CSI-RS resource configuration. If the number of antenna ports of the CSI-RS resource configuration is greater than N1, the terminal device opens N2 receiving antennas for receiving in the time slot where the CSI-RS resource is located. CSI-RS and data transmitted through PDSCH. This is because CSI-RS occupies only a part of resources in a time slot. Other resources can be used to send data. Terminal equipment can receive CSI-RS in a time slot and pass PDSCH. The data sent.

In this embodiment, the terminal device calculates the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and sends the first CQI and / or the second CQI to the network device. In order to solve the problem of how the terminal device reports the CQI to the network device when the receiving antenna is dynamically adjusted under different conditions, the network device can obtain an accurate CQI, and then determine the MCS of the data sent through the PDSCH according to the CQI.

The following uses a specific embodiment to describe the technical solution of the method embodiment shown in FIG. 2 in detail. In this embodiment, the first condition is simultaneous slot scheduling, and the second condition is cross-slot scheduling.

FIG. 4 is an interaction flowchart of a data transmission method embodiment provided in this application. In this embodiment, the interaction between a terminal device and a network device is used as an example for description. As shown in FIG. 4, the method in this embodiment may include:

S201. The network device sends a first DCI to the terminal device. The first DCI includes the number of layers for transmitting the first data through the PDSCH. During the time slot scheduling, the number of layers for the first data is less than or equal to N1. When scheduling across slots, The number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers that the terminal device supports to transmit data through the PDSCH, and N1 is a positive integer.

S202. The network device sends the first data to the terminal device.

S203. The terminal device receives the first DCI, the terminal device receives the first data sent by the network device, and demodulates the received first data according to the first DCI.

With reference to FIG. 5, the process of the terminal device from the low power consumption state to the high power consumption state to fall back to the low power consumption state in this embodiment is described. FIG. 5 illustrates a terminal device provided from the low power consumption state to A schematic diagram of the process of falling back to a low power state after a high power state, as shown in FIG. 5, in the second time slot, the data sent by the network device to the terminal device through the PDSCH and the time when the network device sends the first DCI to the terminal device In the same time slot, which is simultaneous slot scheduling, in the first DCI sent by the network device, the number of layers of the indicated first data is less than or equal to N1, the terminal device opens, for example, N1 antennas to receive the data sent by the network device. In the third time slot after the second time slot, the time when the network device sends DCI to the terminal device is in the third time slot, and the data sent by the network device to the terminal device through the PDSCH is in the fourth time slot. The two are not in the same time slot, that is, Scheduling across time slots. In the first DCI sent by the network device, the number of layers of the indicated first data is less than or equal to N2, then the terminal device turns on, for example, N2 antennas to receive the data sent by the network device. Device fall back to a low power state, the terminal device receives the number of layers transmitted by the network device PDSCH second data equal to or less than N1. For the specific rollback manner, refer to the four implementable manners in the embodiment shown in FIG. 2, which will not be repeated here.

FIG. 6 is a flowchart of an embodiment of a data transmission method provided in this application. As shown in FIG. 6, the method in this embodiment may include:

S301. The network device configures a maximum number of PDSCH layers on a carrier or a bandwidth part (bandwidth part (BWP)) for the terminal device.

In a multi-carrier scenario, a network device configures multiple carriers through RRC signaling. The maximum number of PDSCH layers can be configured for each carrier at the same time. Optionally, the carrier can be configured with the carrier through carrier configuration information or BWP configuration information. Or the maximum number of PDSCH layers on the BWP. The carrier configuration information includes the maximum number of PDSCH layers of the carrier. For example, the maximum number of PDSCH layers on carrier 1 is N1, the maximum number of PDSCH layers on carrier 2 is N2, and N1 is not equal to N2, N1 are less than N2, and the maximum number of PDSCH layers is different for different carrier configurations. The maximum number of PDSCH layers on the primary carrier and the secondary carrier may also be different. For example, the maximum number of PDSCH layers on the primary carrier is N1, and the maximum PDSCH number on the secondary carrier 2 The number of layers is N2. Alternatively, the carrier configuration information includes at least one PDSCH maximum layer number, and one PDSCH maximum layer number is used to indicate a PDSCH maximum layer number of a group of carriers. For example, there are four carriers, namely CC1, CC2, CC3, and CC4. CC1 and CC2 serve as a group of carriers, and CC3 and CC4 serve as a group of carriers. A maximum PDSCH layer number can be configured for each group of carriers.

NR supports multiple BWPs on each carrier. Network devices can configure BWPs through RRC signaling. The maximum number of PDSCH layers can be configured for each BWP or BWP group at the same time. The BWP configuration information includes the maximum PDSCH layer on each BWP. For example, the maximum number of PDSCH layers on BWP1 is N1, the maximum number of PDSCH layers on BWP2 is N2, N1 is not equal to N2, N1 is less than N2, and the maximum number of PDSCH layers of the default BWP (default BWP) is N1, non-default The maximum number of PDSCH layers on the BWP is N2; if the network device is to be switched from BWP1 to BWP2, a time slot offset needs to be added to the original scheduling delay for the terminal device to open more receiving antennas. After the network device schedules, when the terminal device receives data sent through PDSCH on BWP1, it only needs to open N1 receiving antennas, and when the terminal device receives data sent through PDSCH on BWP2, it needs to open N2 receiving antennas. Alternatively, the BWP configuration information includes at least one PDSCH maximum layer number, and one PDSCH maximum layer number is used to indicate a maximum PDSCH layer number on a group of BWPs. For example, there are four groups of BWPs, and a maximum PDSCH layer number can be configured for each group of BWPs.

The network device may indicate the default BWP identification (ID) through RRC signaling, and the terminal device determines the default BWP according to the default BWP identification. If the network device does not indicate a default BWP identification (ID), then the initial BWP (initial BWP) is considered to be the default BWP.

The network device may, but is not limited to, configure the maximum number of PDSCH layers through the PDSCH configuration information in the BWP configuration information, that is, the PDSCH configuration information in the BWP configuration information includes the maximum number of PDSCH layers. The network device may also configure the maximum number of layers in the PDSCH to be associated with the BWP identifier, indicating the maximum number of layers in the PDSCH on the corresponding BWP. Among them, one BWP corresponds to one BWP logo. The network device configures the maximum number of PDSCH layers for the BWP group. A BWP group can have one or more BWPs. The network device and the terminal device can determine the information of the BWP group directly or indirectly. The network device can send the BWP group information to the terminal device through signaling. It can also be considered that the same configuration information indicating the maximum number of PDSCH layers is applied to one or more BWPs, and the one or more BWPs are a BWP group, that is, the network device configures the maximum number of PDSCH layers for the BWP group refers to the network device The same configuration information indicating the maximum number of PDSCH layers is applied to one or more BWPs. For example, the default BWP is configured with a maximum PDSCH layer number N1, and the non-default BWP is configured with a maximum PDSCH layer number N2.

S302. The terminal device obtains the maximum number of layers of the physical downlink shared channel PDSCH on the carrier or bandwidth part BWP.

Specifically, it may be receiving carrier configuration information or BWP configuration information sent by a network device, or acquiring carrier configuration information or BWP configuration information of a network device static configuration.

S303. The network device sends downlink control information DCI to the terminal device, where the DCI includes the number of layers for sending data through the PDSCH.

S304. The network device sends data to the terminal device through the PDSCH on the target carrier or the target BWP, and the number of data layers is less than or equal to the maximum number of PDSCH layers on the target carrier or the target BWP.

S305. The terminal device receives data sent by the network device through the PDSCH on the target carrier or the target BWP.

In the data transmission method provided in this embodiment, by configuring the maximum number of PDSCH layers for each carrier or carrier group, or configuring the maximum number of PDSCH layers for each BWP or BWP group, the terminal device receives data sent through the PDSCH on the corresponding carrier or BWP. According to the configured maximum number of PDSCH layers, a corresponding number of receiving antennas can be opened. When receiving data sent through PDSCH on some carriers or BWPs, fewer receiving antennas can be opened, which can save radio frequency power consumption of terminal equipment.

FIG. 7 is a schematic structural diagram of an embodiment of a terminal device provided in this application. As shown in FIG. 7, the apparatus in this embodiment may include a first receiving module 11 and a second receiving module 12, where:

The first receiving module 11 is configured to receive first downlink control information DCI sent by a network device. The first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH. Under a first condition, the number of layers for the first data Less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers supported by the terminal device for transmitting data through the PDSCH, and N1 is a positive integer.

The second receiving module 12 is configured to receive the first data sent by the network device, and demodulate the first data according to the first DCI.

Optionally, the first DCI further includes a time slot offset of the first data in time, where:

When the number of layers of the first data is less than or equal to N1, the time slot offset is less than a preset value;

When the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the slot offset is greater than or equal to a preset value.

The terminal device in this embodiment may be used to execute the technical solution of the method embodiment shown in FIG. 2. The implementation principle is similar, and details are not described herein again.

In the terminal device provided in this embodiment, when the terminal device receives the first data sent by the network device through the PDSCH, under the first condition, fewer receiving antennas can be opened, and radio frequency power consumption of the terminal device can be saved. Under the second condition, when receiving the first data sent by the network device through the PDSCH, the terminal device can open more receiving antennas, and the receiving antenna can be dynamically adjusted, thereby saving radio frequency power consumption of the terminal device.

FIG. 8 is a schematic structural diagram of an embodiment of a terminal device provided in this application. As shown in FIG. 8, the device in this embodiment is based on the device structure shown in FIG. 7, and may further include a first timing module. 13. The first timing module 1 is used to start the timer after the second receiving module 12 receives the first data sent by the network device, and demodulate the first data according to the first DCI, from the time slot where the first data is located. start the timer;

The second receiving module 12 does not receive data sent through the PDSCH within the preset X time slots. When the timer expires, the number of layers for the second receiving module to receive the second data sent by the network device through the PDSCH is less than or equal to N1 ;or,

When the second receiving module 12 receives the third data sent by the network device through the PDSCH within the preset X time slots, the first timing module 13 restarts the timer.

Further, if the number of layers of the second data is greater than the first preset number of layers, the first timing module restarts the timer;

If the number of layers of the second data is less than or equal to the first preset number of layers, the first timing module continues to count the timer. When the timer expires, the second receiving module receives the layer of the third data sent by the network device through the PDSCH. The number is less than or equal to N1.

The apparatus in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 2, and the implementation principles thereof are similar, and details are not described herein again.

In the terminal device provided in this embodiment, after the terminal device turns on N2 receiving antennas to receive the first data of the network device, the terminal device can fall back to work with less than or equal to N1 receiving antennas through the setting of a timer, thereby saving the terminal device. Power consumption.

FIG. 9 is a schematic structural diagram of an embodiment of a terminal device provided in this application. As shown in FIG. 9, the device in this embodiment is based on the device structure shown in FIG. 7, and may further include a second timing module. 14. The second timing module 14 is configured to start a timer after the second receiving module 12 receives the first data sent by the network device and demodulates the first data according to the first DCI, and starts counting from the position where the first DCI is located. ;

If the second receiving module 12 does not receive the second DCI within the preset X time slots, the number of layers for the second receiving module to receive the second data sent by the network device through the PDSCH is less than or equal to N1; or,

The second receiving module 12 receives the second DCI within the preset X time slots, and then re-times the timer, where the second DCI includes the number of layers of the third data transmitted through the PDSCH.

Further, if the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the second timing module restarts the timer;

If the number of layers of the second data indicated by the second DCI is less than or equal to the first preset number of layers, the second timing module continues to count the timer. When the timer expires, the second receiving module receives The number of layers of the third data is less than or equal to N1.

In the above embodiment, optionally, under the second condition, when the number of times the second data layer is less than the second preset layer number is equal to the preset threshold, the second receiving module 12 receives the network device to send the PDSCH through the PDSCH. The number of layers of the third data is less than or equal to N1, and the preset threshold is a positive integer.

In the terminal device provided in this embodiment, after the terminal device opens N2 receiving antennas to receive the first data of the network device, the terminal device can fall back to work by using less than or equal to N1 receiving antennas by setting the counting device, thereby saving the terminal device. Power consumption.

FIG. 10 is a schematic structural diagram of an embodiment of a terminal device provided in the present application. As shown in FIG. 10, the device in this embodiment is based on the device structure shown in FIG. 7, and may further include a third receiving module. 15. The third receiving module 15 is configured to receive the first data sent by the network device after the second receiving module 12 and demodulate the first data according to the first DCI, and receive the network device to instruct the receiving network device to pass the PDSCH. The indication that the number of layers of the second data sent is less than or equal to N1.

In the terminal device provided in this embodiment, after the terminal device opens N2 receiving antennas to receive the first data of the network device, the terminal device can fall back to work with less than or equal to N1 receiving antennas through the instruction information of the network device, thereby saving the terminal The power consumption of the device.

FIG. 11 is a schematic structural diagram of an embodiment of a terminal device provided in this application. As shown in FIG. 11, the device in this embodiment is based on the device structure shown in any of FIG. 7 to FIG. 10. Further, the device may further include: A fourth receiving module 16 and a processing module 17, wherein the fourth receiving module 16 is configured to receive a channel state information reference signal CSI-RS sent by a network device;

The processing module 17 is configured to calculate the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and send the first CQI and / or the second CQI to the network device.

In the above embodiment, optionally, when receiving the first data sent by the network device in the time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than Or equal to N2.

The terminal device provided in this embodiment calculates the first channel quality information CQI under the first condition and the second CQI under the second condition through the terminal device according to the CSI-RS, and sends the first CQI and / or the second CQI to the network device. CQI solves the problem of how a terminal device reports a CQI to a network device when the receiving antenna is dynamically adjusted under different conditions. The network device can obtain an accurate CQI, thereby determining the MCS of the data sent through the PDSCH according to the CQI.

FIG. 12 is a schematic structural diagram of an embodiment of a network device provided in this application. As shown in FIG. 12, the apparatus in this embodiment may include a first sending module 21 and a second sending module 22, where:

The first sending module 21 is configured to send first downlink control information DCI to a terminal device. The first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH. Under the first condition, the number of layers for the first data is less than Or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers of data transmitted through the PDSCH supported by the terminal device, and N1 is a positive integer.

The second sending module 22 is configured to send the first data to the terminal device.

The network device in this embodiment may be used to execute the technical solution of the method embodiment shown in FIG. 2, and the implementation principles are similar, and details are not described herein again.

In the network device provided in this embodiment, when the network device has data to send, it first sends a first DCI to the terminal device. The first DCI includes the number of layers for transmitting the first data through the PDSCH. Under the first condition, the layer of the first data The number is less than or equal to N1. Under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, and N2 is the maximum number of layers that the terminal device supports to transmit data through PDSCH. When the first data is sent through the PDSCH, under the first condition, fewer receiving antennas can be opened, and radio frequency power consumption of the terminal device can be saved. Under the second condition, when receiving the first data sent by the network device through the PDSCH, the terminal device can open more receiving antennas, and the receiving antenna can be dynamically adjusted, thereby saving radio frequency power consumption of the terminal device.

FIG. 13 is a schematic structural diagram of an embodiment of a network device provided in this application. As shown in FIG. 13, the device in this embodiment is based on the device structure shown in FIG. 12. Further, under the second condition, the device Including: first timing module 23,

The first timing module 23 is configured to start a timer after the second sending module sends the first data to the terminal device, and start timing from the time slot where the first data is located;

If the second sending module 22 does not send data to the terminal device through the PDSCH within the preset X time slots, the number of layers for the second sending module 22 to send the second data to the terminal device through the PDSCH is less than or equal to N1; or,

When the second sending module 22 sends the third data to the terminal device through the PDSCH within the preset X time slots, the first timing module 23 restarts the timer.

Further, if the number of layers of the second data is greater than the first preset number of layers, the first timing module 23 retimes the timer;

If the number of layers of the second data is less than or equal to the first preset number of layers, the first timing module 23 continues to count the timer. When the timer expires, the second sending module 22 sends the third data to the terminal device through the PDSCH. The number of layers is less than or equal to N1.

The network device in this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 2. The technical effects and implementation principles are similar, and are not described herein again.

FIG. 14 is a schematic structural diagram of an embodiment of a network device provided in this application. As shown in FIG. 14, the device in this embodiment is based on the device structure shown in FIG. 12. Further, under the second condition, The second timing module 24 includes: a second timing module 24 is configured to start a timer after the second sending module sends the first data to the terminal device, and start timing from the position where the first DCI is located;

If the second sending module 22 does not send the second DCI to the terminal device within the preset X time slots, the number of layers for the second sending module 22 to send the second data to the terminal device through the PDSCH is less than or equal to N1; or,

When the second sending module 22 sends the second DCI to the terminal device within the preset X time slots, the second timing module 24 retimes the timer, where the second DCI includes the number of layers of the third data transmitted through the PDSCH. .

Further, if the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the second timing module 24 retimes the timer;

If the number of layers of the second data indicated by the second DCI is less than or equal to the first preset number of layers, the second timing module 24 continues to count the timer. When the timer expires, the second sending module 22 sends a PDSCH to the terminal device. The number of layers transmitting the third data is less than or equal to N1.

In the above embodiment, under the second condition, when the number of times the second data is less than the second preset number of layers is equal to the preset threshold, the second sending module 22 sends the third data to the terminal device through the PDSCH. The number of layers is less than or equal to N1, and the preset threshold is a positive integer.

FIG. 15 is a schematic structural diagram of an embodiment of a network device provided in the present application. As shown in FIG. 15, the device in this embodiment is based on the device structure shown in FIG. 12, and further may include a third sending module. 25. After the second sending module 22 sends the first data to the terminal device, send the instruction information to the terminal device to indicate that the number of layers for sending the second data to the terminal device through the PDSCH is less than or equal to N1.

FIG. 16 is a schematic structural diagram of an embodiment of a network device provided in the present application. As shown in FIG. 16, the device in this embodiment is based on the device structure shown in any of FIG. 12 to FIG. 15, and may further include: : A fourth sending module 26 and a receiving module 27, wherein the fourth sending module 26 is configured to send a channel state information reference signal CSI-RS to the terminal device, and is used by the terminal device to calculate the first channel under the first condition according to the CSI-RS The quality information CQI and the second CQI under the second condition;

The receiving module 27 is configured to receive a first CQI and / or a second CQI sent by a terminal device.

In the foregoing embodiment, when the first data is sent to the terminal device by the time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.

FIG. 17 is a schematic structural diagram of an embodiment of a terminal device provided in this application. As shown in FIG. 17, the apparatus in this embodiment may include an obtaining module 31, a first receiving module 32, and a second receiving module 33. Module 31 is configured to obtain the maximum number of layers of the physical downlink shared channel PDSCH on the carrier or bandwidth part BWP;

The first receiving module 32 is configured to receive downlink control information DCI sent by a network device, where the DCI includes the number of layers to send data through the PDSCH;

The second receiving module 33 is configured to receive data sent by the network device through the PDSCH on the target carrier or the target BWP, and demodulate the data according to the DCI. The number of data layers is less than or equal to the maximum number of PDSCH layers on the target carrier or the target BWP.

Optionally, the obtaining module 31 is configured to obtain carrier configuration information or BWP configuration information. The carrier configuration information includes the maximum number of PDSCH layers of each carrier, or the carrier configuration information includes at least one maximum PDSCH layer and one PDSCH maximum layer. The number is used to indicate the maximum number of PDSCH layers for a group of carriers. The BWP configuration information includes the maximum number of PDSCH layers on each BWP, or the BWP configuration information includes at least one maximum PDSCH layer number. One PDSCH maximum layer number is used to indicate Maximum number of PDSCH layers on a group of BWPs;

The maximum number of PDSCH layers of each carrier is obtained according to the carrier configuration information, or the maximum number of PDSCH layers on each BWP is obtained according to the BWP configuration information.

The terminal device in this embodiment may be used to execute the technical solution of the method embodiment shown in FIG. 6. The technical effects and implementation principles are similar, and are not described herein again.

FIG. 18 is a schematic structural diagram of an embodiment of a network device provided in this application. As shown in FIG. 18, the apparatus in this embodiment may include a configuration module 41, a first sending module 42, and a second sending module 43, where:

The configuration module 41 is configured to configure a maximum number of layers of a physical downlink shared channel PDSCH on a carrier or bandwidth part BWP for a terminal device;

The first sending module 42 is configured to send downlink control information DCI to the terminal device, where the DCI includes the number of layers for sending data through the PDSCH;

The second sending module 43 is configured to send data to the terminal device through the PDSCH on the target carrier or the target BWP, and the number of data layers is less than or equal to the maximum number of PDSCH layers on the target carrier or the target BWP.

Optionally, the configuration module 41 is configured to configure the carrier or the maximum PDSCH layer number on the BWP for the terminal device by using the carrier configuration information or the BWP configuration information, and the carrier configuration information includes the maximum PDSCH layer number of the carrier, or the carrier configuration information Including at least one PDSCH maximum layer number, one PDSCH maximum layer number is used to indicate the maximum PDSCH layer number of a group of carriers, the BWP configuration information includes the maximum PDSCH layer number on each BWP, or the BWP configuration information includes at least one PDSCH Maximum number of layers. One PDSCH maximum layer number is used to indicate the maximum number of PDSCH layers on a group of BWPs.

The network device in this embodiment may be used to execute the technical solution of the method embodiment shown in FIG. 6. The technical effects and implementation principles are similar, and are not described herein again.

This application can divide the functional modules of the terminal device or the network device according to the foregoing method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated modules may be implemented in the form of hardware or software functional modules. It should be noted that the division of the modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner.

FIG. 19 is a schematic structural diagram of another terminal device provided by this application. The terminal device 700 includes:

The memory 701 is configured to store program instructions, and the memory 701 may be a flash (flash memory).

The processor 702 is configured to call and execute program instructions in the memory to implement each step in the data transmission method of any one of FIG. 2 to FIG. 4 or FIG. 6. For details, refer to related descriptions in the foregoing method embodiments.

An input / output interface 703 may also be included. The input / output interface 703 may include an independent output interface and an input interface, or may be an integrated interface that integrates input and output. The output interface is used to output data, and the input interface is used to obtain input data. The output data is the collective name of the output in the method embodiment, and the input data is the collective name of the input in the method embodiment.

The terminal device may be configured to execute steps and / or processes corresponding to the terminal device in the foregoing method embodiments.

FIG. 20 is a schematic structural diagram of another network device provided in this application. The network device 800 includes:

The memory 801 is configured to store program instructions, and the memory 801 may be a flash (flash memory).

The processor 802 is configured to call and execute program instructions in the memory to implement each step in the data transmission method of any one of FIG. 2 to FIG. 4 or FIG. 6. For details, refer to related descriptions in the foregoing method embodiments.

An input / output interface 803 may also be included. The input / output interface 803 may include an independent output interface and an input interface, or may be an integrated interface that integrates input and output. The output interface is used to output data, and the input interface is used to obtain input data. The output data is the collective name of the output in the method embodiment, and the input data is the collective name of the input in the method embodiment.

The network device may be configured to execute steps and / or processes corresponding to the network device in the foregoing method embodiment.

The present application also provides a readable storage medium that stores an execution instruction. When at least one processor of the terminal device executes the execution instruction, the terminal device executes the data transmission method in the foregoing method embodiment.

The application also provides a program product including an execution instruction, and the execution instruction is stored in a readable storage medium. At least one processor of the terminal device may read the execution instruction from a readable storage medium, and the execution of the execution instruction by the at least one processor causes the terminal device to implement the data transmission method in the foregoing method embodiment.

A person of ordinary skill in the art may understand that in the foregoing embodiments, all or part may be implemented by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server, or data center Transmission by wire (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, and the like that includes one or more available medium integration. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (Solid State Disk (SSD)), and the like.

Claims

A data transmission method, comprising:

Receive first downlink control information DCI sent by a network device, the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH, and under a first condition, the number of layers for the first data is less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers of data transmitted through the PDSCH supported by the terminal device, and N1 is a positive integer;

Receiving first data sent by the network device, and demodulating the first data according to the first DCI.
The method according to claim 1, wherein the first DCI further comprises a time slot offset of the first data in time, wherein,

When the number of layers of the first data is less than or equal to N1, the slot offset is less than a preset value;

When the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the slot offset is greater than or equal to the preset value.
The method according to claim 1, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, the receiving the first data sent by the network device, and according to the first After a DCI demodulates the first data, the method further includes:

Start a timer to start counting from the time slot where the first data is located;

No data sent through the PDSCH is received within the preset X time slots, and when the timer times out, the number of layers receiving the second data sent by the network device through the PDSCH is less than or equal to N1; or,

When the third data sent by the network device through the PDSCH is received in preset X time slots, the timer restarts.
The method according to claim 1, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, the receiving the first data sent by the network device, and according to the first After a DCI demodulates the first data, the method further includes:

Start a timer to start counting from the position where the first DCI is located;

The second DCI is not received within the preset X time slots, and when the timer expires, the number of layers receiving the second data sent by the network device through the PDSCH is less than or equal to N1; or,

When the second DCI is received within preset X time slots, the timer re-times, where the second DCI includes the number of layers of the third data transmitted through the PDSCH.
The method according to claim 3, wherein when the second data sent by the network device through the PDSCH is received within a preset X time slots, the timer restarts, including: :

If the number of layers of the second data is greater than the number of first preset layers, the timer restarts;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, the third data received by the network device through the PDSCH is received. The number of layers of data is less than or equal to N1.
The method according to claim 4, characterized in that, when the second DCI is received within a preset X time slots, the timer restarts, comprising:

If the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the timer restarts;

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, the network device is received by the network device through the The number of layers of the third data sent by the PDSCH is less than or equal to N1.
The method according to claim 1, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, the receiving the first data sent by the network device, and according to the first After a DCI demodulates the first data, the method further includes:

When the number of layers of the second data is less than the second preset layer number is equal to a preset threshold, then the number of layers receiving the third data sent by the network device through the PDSCH is less than or equal to N1, the preset threshold Is a positive integer.
The method according to claim 1, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, the receiving the first data sent by the network device, and according to the first After a DCI demodulates the first data, the method further includes:

Receiving indication information sent by the network device and used to indicate that the number of layers receiving second data sent by the network device through the PDSCH is less than or equal to N1.
The method according to any one of claims 1-8, wherein the method further comprises:

Receiving a channel state information reference signal CSI-RS sent by the network device;

Calculate the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and send the first CQI and / or the second CQI to the network device.
The method according to claim 9, further comprising:

When the time unit where the CSI-RS resource is located receives the first data sent by the network device, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.
A data transmission method, comprising:

Send first downlink control information DCI to a terminal device, where the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH, and under a first condition, the number of layers for the first data is less than or equal to N1 ; Under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is a maximum number of layers of data supported by the terminal device for transmitting data through PDSCH, and N1 is a positive integer;

Sending first data to the terminal device.
The method according to claim 11, wherein the first DCI further comprises a time slot offset of the first data in time, wherein,

When the number of layers of the first data is less than or equal to N1, the slot offset is less than a preset value;

When the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the slot offset is greater than or equal to the preset value.
The method according to claim 11, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, and after the sending the first data to the terminal device, the method further comprises :

Start a timer to start counting from the time slot where the first data is located;

Data is not sent to the terminal device through the PDSCH within the preset X time slots, and when the timer expires, the number of layers for sending second data to the terminal device through the PDSCH is less than or equal to N1 ;or,

When the third data is sent to the terminal device through the PDSCH within the preset X time slots, the timer restarts.
The method according to claim 11, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, and after the sending the first data to the terminal device, the method further comprises :

Start a timer to start counting from the position where the first DCI is located;

The second DCI is not sent to the terminal device within the preset X time slots, and when the timer expires, the number of layers for sending the second data to the terminal device through the PDSCH is less than or equal to N1; or ,

When the second DCI is sent to the terminal device within preset X time slots, the timer is re-timed, where the second DCI includes the number of layers of the third data transmitted through the PDSCH.
The method according to claim 13, wherein when the second data is sent to the terminal device through the PDSCH within a preset X timeslots, the timer restarts, comprising:

If the number of layers of the second data is greater than the number of first preset layers, the timer restarts;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, third data is sent to the terminal device through the PDSCH. The number of layers is less than or equal to N1.
The method according to claim 14, characterized in that, when the second DCI is sent to the terminal device within a preset X time slots, the timer restarts, comprising:

If the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the timer restarts;

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the timer continues to count, and when the timer expires, the terminal is notified to the terminal through the PDSCH. The number of layers in which the device sends the third data is less than or equal to N1.
The method according to claim 11, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, and after the sending the first data to the terminal device, the method further comprises :

When the number of layers of the second data is less than the second preset layer number is equal to the preset threshold, the number of layers of the third data sent to the terminal device through the PDSCH is less than or equal to N1, and the preset threshold is Positive integer.
The method according to claim 11, characterized in that, under the second condition, the number of layers of the first data is less than or equal to N2, and after the sending the first data to the terminal device, the method further comprises :

And sending, to the terminal device, instruction information used to indicate that the number of layers for sending second data to the terminal device through the PDSCH is less than or equal to N1.
The method according to any one of claims 11 to 18, wherein the method further comprises:

Sending a channel state information reference signal CSI-RS to the terminal device, for the terminal device to calculate the first channel quality information CQI under the first condition and the first channel quality information CQI under the second condition according to the CSI-RS. Two CQI;

Receiving a first CQI and / or a second CQI sent by the terminal device.
The method according to claim 19, further comprising:

When sending the first data to the terminal device in a time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.
A terminal device, comprising:

A first receiving module is configured to receive first downlink control information DCI sent by a network device, where the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH. Under a first condition, the first The number of layers of data is less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers of data transmitted through the PDSCH supported by the terminal device, N1 Is a positive integer;

A second receiving module is configured to receive first data sent by the network device, and demodulate the first data according to the first DCI.
The terminal device according to claim 21, wherein the first DCI further comprises a time slot offset of the first data in time, wherein,

When the number of layers of the first data is less than or equal to N1, the slot offset is less than a preset value;

When the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the slot offset is greater than or equal to the preset value.
The terminal device according to claim 21, wherein under the second condition, the terminal device further comprises:

A first timing module, configured to start a timer after the second receiving module receives first data sent by the network device and demodulate the first data according to the first DCI, and The time slot where the data is located starts to count;

The second receiving module does not receive data sent through the PDSCH within the preset X time slots, and when the timer times out, the second receiving module receives the network device sending through the PDSCH The number of layers of the second data is less than or equal to N1; or,

When the second receiving module receives the third data sent by the network device through the PDSCH within preset X time slots, the first timing module retimes the timer.
The terminal device according to claim 21, wherein under the second condition, the terminal device further comprises:

A second timing module, configured to start a timer after the second receiving module receives the first data sent by the network device and demodulates the first data according to the first DCI, and DCI starts timing;

The second receiving module does not receive the second DCI within the preset X time slots. When the timer expires, the second receiving module receives the second data sent by the network device through the PDSCH. Is less than or equal to N1; or,

When the second receiving module receives the second DCI within preset X time slots, the timer is re-timed, wherein the second DCI includes the number of layers of the third data transmitted through the PDSCH. .
The terminal device according to claim 23, wherein

If the number of layers of the second data is greater than the first preset number of layers, the first timing module re-times the timer;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the first timing module continues counting the timer, and when the timer times out, the second receiving module The number of layers receiving the third data sent by the network device through the PDSCH is less than or equal to N1.
The terminal device according to claim 24, wherein

If the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the second timing module re-times the timer;

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the second timing module continues counting the timer, and when the timer times out, all the The number of layers in which the second receiving module receives third data sent by the network device through the PDSCH is less than or equal to N1.
The terminal device according to claim 21, wherein under the second condition, when the number of times of the second data is less than the second preset number of times is equal to a preset threshold, the second receiving module receives The number of layers of the third data sent by the network device through the PDSCH is less than or equal to N1, and the preset threshold is a positive integer.
The terminal device according to claim 21, wherein under the second condition, the terminal device further comprises:

A third receiving module, configured to receive the first data sent by the network device after the second receiving module receives the first data sent by the network device and demodulate the first data according to the first DCI; And indication information indicating that the number of layers receiving second data sent by the network device through the PDSCH is less than or equal to N1.
The terminal device according to any one of claims 21-28, wherein the terminal device further comprises:

A fourth receiving module, configured to receive a channel state information reference signal CSI-RS sent by the network device;

A processing module, configured to calculate the first channel quality information CQI under the first condition and the second CQI under the second condition according to the CSI-RS, and send the first CQI and / or the first CQI to the network device Two CQI.
The terminal device according to claim 29, wherein

When the time unit where the CSI-RS resource is located receives the first data sent by the network device, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.
A network device, comprising:

A first sending module, configured to send first downlink control information DCI to a terminal device, where the first DCI includes a number of layers for transmitting first data through a physical downlink shared channel PDSCH, and under the first condition, the first data The number of layers is less than or equal to N1; under the second condition, the number of layers of the first data is less than or equal to N2, N1 <N2, N2 is the maximum number of layers supported by the terminal device for transmitting data through PDSCH, and N1 is Positive integer

A second sending module, configured to send first data to the terminal device.
The network device according to claim 31, wherein the first DCI further comprises a time slot offset of the first data in time, wherein,

When the number of layers of the first data is less than or equal to N1, the slot offset is less than a preset value;

When the number of layers of the first data is changed from less than or equal to N1 to less than or equal to N2, the slot offset is greater than or equal to the preset value.
The network device according to claim 31, wherein under the second condition, the network device further comprises:

A first timing module, configured to start a timer after the second sending module sends the first data to the terminal device, and start timing from a time slot where the first data is located;

The second sending module does not send data to the terminal device through the PDSCH within the preset X time slots, and when the timer expires, the second sending module sends the data to the terminal through the PDSCH. The number of layers in which the device sends the second data is less than or equal to N1; or

When the second sending module sends third data to the terminal device through the PDSCH within preset X time slots, the first timing module re-times the timer.
The network device according to claim 31, wherein under the second condition, the network device further comprises:

A second timing module, configured to start a timer after the second sending module sends the first data to the terminal device, and start timing from a position where the first DCI is located;

If the second sending module does not send the second DCI to the terminal device within a preset X time slots, and the timer expires, the second sending module sends the second data to the terminal device through the PDSCH. Is less than or equal to N1; or,

When the second sending module sends a second DCI to the terminal device within a preset X time slots, the second timing module re-times the timer, where the second DCI includes The number of layers of the third data transmitted by the PDSCH is described.
The network device according to claim 33, wherein:

If the number of layers of the second data is greater than the first preset number of layers, the first timing module re-times the timer;

If the number of layers of the second data is less than or equal to the number of the first preset layers, the first timing module continues counting the timer, and when the timer times out, the second sending module The number of layers that send third data to the terminal device through the PDSCH is less than or equal to N1.
The network device according to claim 34, wherein:

If the number of layers of the second data indicated by the second DCI is greater than the first preset number of layers, the second timing module re-times the timer;

If the number of layers of the second data indicated by the second DCI is less than or equal to the number of the first preset layers, the second timing module continues counting the timer, and when the timer times out, all the The second sending module sends the third data to the terminal device through the PDSCH in a number of layers less than or equal to N1.
The network device according to claim 31, wherein under the second condition, when the number of times that the number of layers of the second data is less than the second preset number of layers is equal to a preset threshold, the second sending module passes Said

The number of layers in which the PDSCH sends third data to the terminal device is less than or equal to N1, and the preset threshold is a positive integer.
The network device according to claim 31, wherein under the second condition, the network device further comprises:

A third sending module, configured to send, after the second sending module sends the first data to the terminal device, the number of layers used to instruct the terminal device to send the second data to the terminal device through the PDSCH The instruction information is less than or equal to N1.
The network device according to any one of claims 31-38, wherein the network device further comprises:

A fourth sending module is configured to send a channel state information reference signal CSI-RS to the terminal device, and is used by the terminal device to calculate the first channel quality information CQI and the first channel quality information under the first condition according to the CSI-RS. The second CQI under the second condition;

A receiving module, configured to receive a first CQI and / or a second CQI sent by the terminal device.
The network device according to claim 39, wherein:

When sending the first data to the terminal device in a time unit where the CSI-RS resource is located, if the number of antenna ports configured in the CSI-RS resource is greater than N1, the number of layers of the first data is less than or equal to N2.
A terminal device includes: a memory and a processor;

Memory for storing program instructions;

The processor is configured to call a program instruction in the memory to execute the data transmission method according to any one of claims 1-10.
A network device includes: a memory and a processor;

Memory for storing program instructions;

The processor is configured to call a program instruction in the memory to execute the data transmission method according to any one of claims 11-20.
A readable storage medium stores an execution instruction in the readable storage medium. When at least one processor of a terminal device executes the execution instruction, the terminal device executes the data transmission method according to any one of claims 1-10.
A readable storage medium stores execution instructions therein. When at least one processor of a network device executes the execution instructions, the network device executes the data transmission method according to any one of claims 11-20.
A transmission method for the number of transmission layers, characterized in that the method includes:

The network device configures the maximum number of layers of the physical downlink shared control channel PDSCH of the bandwidth part BWP;

The maximum number of layers in which the network device sends the PDSCH.
The method according to claim 45, further comprising:

The network device configures the BWP through radio link control RRC signaling.
The method according to claim 45 or 46, wherein the maximum number of PDSCH layers configured by the network device for the BWP comprises:

The network device configures a maximum number of PDSCH layers for each BWP of the multiple BWPs; or

The network device configures a maximum number of PDSCH layers for the BWP group.
The method according to claim 47, wherein the plurality of BWPs includes a default BWP and a non-default BWP, a maximum number of PDSCH layers on the default BWP is N1, and a maximum number of PDSCH on the non-default BWP The number of layers is N2, and N1 and N2 are positive integers.
A transmission method for the number of transmission layers, characterized in that the method includes:

The terminal device acquires the maximum number of layers of the physical downlink shared control channel PDSCH of the bandwidth part BWP.
The method according to claim 49, further comprising:

The BWP is configured by radio link control RRC signaling.
The method according to claim 49 or 50, wherein the multiple BWPs include a default BWP and a non-default BWP, the maximum number of PDSCH layers on the default BWP is N1, and the maximum number of PDSCH on the non-default BWP is The number of layers is N2, and N1 and N2 are positive integers.
A network device includes:

A processing unit configured to configure a maximum number of layers of a physical downlink shared control channel PDSCH of a bandwidth part BWP;

A sending unit, configured to send the maximum number of layers of the PDSCH.
The network device according to claim 52, wherein:

The processing unit is further configured to configure the BWP through radio link control RRC signaling.
The network device according to claim 52 or 53, wherein:

The processing unit is further configured to configure a maximum number of PDSCH layers for each BWP of multiple BWPs; or configure a maximum number of PDSCH layers for a BWP group.
The network device according to claim 54, wherein the plurality of BWPs include a default BWP and a non-default BWP, a maximum number of layers of PDSCH on the default BWP is N1, and a number of PDSCH on the non-default BWP The maximum number of layers is N2, and N1 and N2 are positive integers.
A terminal device including:

The obtaining unit is configured to obtain a maximum number of layers of a physical downlink shared control channel PDSCH of a bandwidth part BWP.
The terminal device according to claim 56, wherein the BWP is configured to control RRC signaling through a radio link.
The terminal device according to claim 56 or 57, wherein the multiple BWPs include a default BWP and a non-default BWP, a maximum number of PDSCH layers on the default BWP is N1, and a PDSCH on the non-default BWP The maximum number of layers is N2, and N1 and N2 are positive integers.
A communication device, comprising a processor and a memory;

The memory is configured to store a computer execution instruction;

The processor is configured to execute computer execution instructions stored in the memory, so that the communication device executes the method according to any one of claims 45 to 48.
A communication device, comprising a processor and a memory;

The memory is configured to store a computer execution instruction;

The processor is configured to execute computer execution instructions stored in the memory, so that the communication device executes the method according to any one of claims 49 to 51.
A readable storage medium is used for storing instructions, and when the instructions are executed, the method according to any one of claims 45-48 is implemented.
A readable storage medium is used for storing instructions, and when the instructions are executed, the method according to any one of claims 49-51 is implemented.
A communication device includes a processor and an interface circuit;

The interface circuit is configured to receive a code instruction and transmit it to the processor;

The processor is configured to execute the code instructions to perform the method according to any one of claims 45 to 48.
A communication device includes a processor and an interface circuit;

The interface circuit is configured to receive a code instruction and transmit it to the processor;

The processor is configured to execute the code instructions to perform the method according to any one of claims 49-51.