WO2019196801A1

WO2019196801A1 - Data transmission method, and communication apparatus and system

Info

Publication number: WO2019196801A1
Application number: PCT/CN2019/081769
Authority: WO
Inventors: 徐明慧; 张希; 陈磊
Original assignee: 华为技术有限公司
Priority date: 2018-04-10
Filing date: 2019-04-08
Publication date: 2019-10-17
Also published as: CN110365380A; CN110365380B

Abstract

The present application provides a data transmission method, and a communication apparatus and system. The method comprises: a network device determines multiple channel correlation values of multiple terminal devices on a first resource unit, the multiple terminal devices comprising devices communicating by means of the first resource unit; each of the multiple channel correlation values indicating the interference degree between two terminal devices of the multiple terminal devices; the network device determines, according to the multiple channel correlation values, a pre-coding mode corresponding to each of the multiple terminal devices, a first terminal device corresponding to a first pre-coding mode; the first terminal device being any one of the multiple terminal devices; the network device uses the first pre-coding mode corresponding to the first terminal device to send data to the first terminal device by means of the first resource unit. According to embodiments of the present application, the system performance can be improved.

Description

Data transmission method, communication device and system

This application claims the priority of the Chinese Patent Application filed on April 10, 2018, the Chinese National Intellectual Property Office, the application number is 201810315139.3, and the application name is "Data Transmission Method, Communication Device and System", the entire contents of which are incorporated by reference. In this application.

Technical field

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

Background technique

In the existing long term evolution (LTE) system, multiple input multiple output (MIMO) is a key technology of the physical layer, mainly using multiple transmit antennas and multiple receive antennas to enhance A method of system performance.

Among them, the precoding technology is a very important step of MIMO. Before performing precoding, the system first maps the data information to be sent to different layers through layer mapping, so that the data information is allocated to different ones in a certain way. At the layer, the data information assigned to the layer is mapped to the physical antenna by precoding techniques. The precoding technique can transfer some necessary signal processing procedures that are difficult to implement at the receiving end to the transmitting end to ensure the signal performance of the transmission process.

The existing precoding technology is actually an adaptive technology. As channel state information (CSI) changes, the result of precoding the data information will change accordingly. This change according to CSI The real-time changing data information pre-processing technology enables the terminal device to obtain the correct target data information in the changed CSI. Therefore, pre-coding is a very critical technology in the long term evolution (LTE) system MIMO.

The performance and complexity of different precoding methods are different from each other. Typical precoding methods can be divided into linear precoding and nonlinear precoding. Each type of precoding has its suitable working scenario.

In the existing LTE protocol, the terminal device determines the full-bandwidth precoding mode of the terminal device according to the channel correlation of the full bandwidth. In LTE, since the system bandwidth is small, the channel correlation between the terminal devices is at the full bandwidth. The change in the above is small, and the pre-coding method between each terminal device can be accurately determined by using the full-bandwidth channel correlation. However, in the fifth generation of new radio (NR) technology, the system bandwidth can be as high as 400M, and the maximum bandwidth supported by each terminal device will be greatly different. At this time, the channel correlation between terminal devices is difficult in the system. The bandwidth is consistent. Therefore, the pre-coding mode of the terminal device is determined by the channel correlation of the full bandwidth at this time, which may result in inaccurate selection of the precoding mode and affect system performance.

Summary of the invention

The present application provides a data transmission method, communication device and system, which can improve system performance.

In a first aspect, a method for data transmission is provided, the method comprising: determining, by a network device, a plurality of channel correlation values of a plurality of terminal devices on a first resource unit, wherein the plurality of terminal devices comprise using the first resource a unit communication device, each channel correlation value of the plurality of channel correlation values indicating a degree of interference between two of the plurality of terminal devices; the network device according to the plurality of channel correlation values, Determining a precoding mode corresponding to each of the plurality of terminal devices, where the first terminal device corresponds to a first precoding mode, and the first terminal device is any one of the plurality of terminal devices; the network device Transmitting data to the first terminal device by using the first resource unit in a first precoding manner corresponding to the first terminal device.

In the embodiment of the present application, the network device uses the resource unit as the granularity to determine the precoding mode according to the channel correlation value of the terminal device on the resource unit, and the precoding method corresponding to the same terminal device on different resource units may be different, which avoids the present In the prior art, the terminal device determines the disadvantage of a precoding method over the full bandwidth. Therefore, the embodiment of the present application determines the precoding mode corresponding to the terminal device in each resource unit by using the channel correlation of the terminal device on different resource units, thereby improving system performance.

It should be understood that the plurality of terminal devices include devices that communicate using the first resource unit, each channel correlation value of the plurality of channel correlation values indicating interference between two of the plurality of terminal devices degree.

That is, each channel correlation value represents the degree of interference between each two terminal devices, and when there are n plurality of terminal devices communicating using the first resource unit, then the plurality of channels corresponding to the n terminal devices Correlation values include

One. For example, when n is 3, that is, the plurality of terminal devices are three terminal devices (the first terminal device to the third terminal device), the multiple correspondence value may include

(ie, 3) channel correlation values, that is, channel correlation values corresponding to the first terminal device and the second terminal device, correlation values corresponding to the first terminal device and the third terminal device, and the second value The channel correlation value corresponding to the third terminal device of the terminal device.

It should be understood that the value of the channel correlation indicates the degree of interference between two terminal devices that communicate using the first resource granularity. When the channel correlation value is larger, the degree of interference between the two terminal devices is greater, and vice versa. The smaller the channel correlation value, the smaller the degree of interference between the two terminal devices.

With reference to the first aspect, in an implementation manner of the first aspect, the size of the first resource unit is preset, that is, the size of the first resource unit is a system default. In this case, the network device and the terminal device do not need to determine the size of the first resource unit, and the network device and the terminal device know the size of the first resource unit in advance. The network device may directly determine the precoding mode by using the method in the embodiment of the present application according to the default first resource unit size. Correspondingly, the terminal device can directly demodulate the received data by using the method of the embodiment of the present application according to the default first resource unit size.

Because the size of the resource unit is preset, the network device and the terminal device do not need to confirm the size of the resource unit in the embodiment of the present application, and the network device does not need to send signaling to the terminal device to indicate the size of the resource unit. Applying an embodiment can save resources and reduce signaling overhead.

In conjunction with the first aspect, in an implementation manner of the first aspect, the method further includes:

The network device determines a size of the first resource unit;

The network device sends the first indication information to the first terminal device, where the first indication information is used to indicate the size of the first resource unit.

In other words, the size of the first resource unit is determined by the network device. In this case, the network device first determines the size of the first resource unit, and then needs to indicate the size of the resource unit of the terminal device.

It should be understood that, in the embodiment of the present application, the first indication information may be high layer signaling, such as radio resource control (RRC) signaling, or may be medium access control (MAC) layer signaling. The embodiment may not be limited to the downlink control information (DCI), or the broadcast information.

With reference to the first aspect, in an implementation manner of the first aspect, the determining, by the network device, the size of the first resource unit includes:

The network device determines the size of the first resource unit according to the degree of fluctuation of the channel correlation of each two terminal devices over the full bandwidth.

For example, the slower the channel correlation change of the two terminal devices on the full bandwidth, the larger the resource unit, and the faster the channel correlation of the two terminal devices on the full bandwidth changes, the smaller the resource unit.

The size of the resource unit is directly related to the performance of the non-linear pre-coding. The embodiment of the present application determines the size of the resource unit according to the degree of fluctuation of the channel correlation of the terminal device on the full bandwidth by using the most intuitive method. Therefore, the embodiment of the present application determines the size of the resource unit. The size of the appropriate resource unit can be determined flexibly according to the channel state.

Alternatively, the network device determines the size of the first resource unit, including:

The network device determines the size of the first resource unit according to the size of the scheduling bandwidth of the multiple terminal devices.

For example, the larger the scheduling bandwidth of the terminal device, the larger the absolute bandwidth (in MHz) occupied by the resource unit or the larger the number of RBs included, the smaller the scheduling bandwidth of the terminal device, and the absolute bandwidth occupied by the resource unit (in MHz). ) or the smaller the number of RBs included.

Determining, by the network device, a size of the first resource unit according to a size of a subcarrier interval in a scheduling bandwidth of the multiple terminal devices, where

For example, the larger the subcarrier spacing in the scheduling bandwidth of the terminal device, the smaller the number of RBs included in the resource unit; the smaller the subcarrier spacing, the more RBs the resource unit contains; or the subcarrier spacing in the scheduling bandwidth of the terminal device. The larger the absolute bandwidth (in MHz) occupied by the resource unit, the smaller the subcarrier spacing of the terminal device, and the smaller the absolute bandwidth (in MHz) occupied by the resource unit. Optionally, the network device may determine a resource unit size corresponding to the current subcarrier according to a one-to-one correspondence between the preset multiple subcarrier spacings and the multiple resource unit sizes.

In the embodiment of the present application, the network device can flexibly determine the size of the appropriate resource unit according to the size of the subcarrier spacing.

The network device selects one of the preset values of the plurality of resource unit sizes as the size of the first resource unit.

In the embodiment of the present application, by specifying a set of resource unit sizes, the size of the resource unit is directly selected from the set, which can reduce the complexity of the implementation and reduce the signaling overhead.

With reference to the first aspect, in an implementation manner of the first aspect, the network device selects one of the values of the plurality of resource unit sizes as the size of the first resource unit, including:

The network device is preset from at least one of a degree of fluctuation of channel correlation between the terminal devices, a size of a scheduling bandwidth of the plurality of terminal devices, and a size of a subcarrier spacing in a scheduling bandwidth of the plurality of terminal devices. One of the multiple resource unit size values is selected as the size of the first resource unit.

It should be noted that since the state of the channel changes in real time, the division of the size of the resource unit also needs to be updated according to the state change of the channel.

It should be understood that, after updating the resource unit size in the embodiment of the present application, the network device needs to resend the first indication information to indicate the latest resource unit size, and determine the precoding manner according to the updated resource unit size.

It should be noted that, after the current data transmission ends, when the downlink data is subsequently transmitted, when the resource unit size does not change, the network device may not need to send the first indication information, and the terminal device may follow the indication of the network device during the last data transmission. Determine the size of the resource unit corresponding to the current data transmission.

Of course, in the case of the data transmission, the network device may also send the first indication information to indicate the size of the resource unit, regardless of whether the size of the resource unit changes. The embodiment of the present application is not limited thereto.

Optionally, the size of the resource unit may be periodically updated in the embodiment of the present application.

For example, the period unit of the size of the updated resource unit may be a mini slot, which may be a time slot, such as a period of N slots, where the value of N may be a positive integer, such as N=1, indicating The size of the resource unit is updated once per time slot.

Further, for example, N=1, 2, 4, 8, or 16 (corresponding to 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz subcarrier spacing, respectively) indicates that the size of the resource unit is updated once per subframe.

For example, N=10, 20, 40, 80 or 160 (corresponding to 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240 kHz subcarrier spacing respectively) means that the size of the resource unit is updated once per system frame; the period unit may also be a subframe For example, M subframes, M=1 means that each subframe updates the size of the resource unit, and M=10 means that the size of the resource unit is updated once per frame; the period unit can also be an absolute time, such as 5ms, 10ms, 20ms. The embodiment of the present application is not limited thereto, 40 ms, 80 ms, 100 ms, 200 ms, 400 ms, 800 ms, 1600 ms, ... and the like.

Therefore, the embodiment of the present application can periodically determine the size of the resource unit corresponding to the current channel state by periodically updating the resource unit size, and further determine the precoding mode according to the size of the updated resource unit, thereby improving system performance.

Alternatively, the embodiment of the present application may also update the size of the resource unit aperiodically.

For example, the size update of a resource unit is triggered by a network device or a terminal device.

Therefore, in the embodiment of the present application, the network device or the terminal device updates the channel state information to update the resource unit size flexibly, and when the channel state changes greatly, the size of the resource unit corresponding to the current channel state can be determined in time, and then The precoding method is determined according to the size of the updated resource unit, which can improve system performance.

The network device determines a size of the first resource unit according to a preset parameter, where the preset parameter includes a size of a scheduling bandwidth of the terminal device, and a subcarrier spacing in a scheduling bandwidth of the terminal device.

That is, the network device and the terminal device determine the size of the first resource unit in the same manner or rule. In this case, the same resource unit size can be determined by the same method or rule at both ends of the transceiver. Therefore, the network device does not need to send an indication of the size of the additional resource unit to the terminal device.

In the embodiment of the present application, the network device and the terminal device determine the size of the resource unit according to the same rule. Therefore, the network device does not need to additionally indicate the size of the resource unit of the terminal device by using signaling, which can reduce the complexity of the implementation and reduce the number of the information. Make the cost.

The network device sends second indication information to the first terminal device, where the second indication information is used to indicate the first precoding mode.

With reference to the first aspect, in an implementation manner of the first aspect, the second indication information is in the form of a bitmap, where the number of bits of the second indication information and the resource unit in the scheduling bandwidth of the first terminal device The numbers are equal, wherein each bit in the second indication information is used to indicate a precoding manner corresponding to one resource unit.

For example, in the embodiment of the present application, the precoding mode of each resource unit may be explicitly indicated in the form of a bitmap. If the number of resource units is four, the bitmap has four bits, for example, 0110 indicates four. The precoding method on the resource unit is {linear precoding, nonlinear precoding, nonlinear precoding, linear precoding}, or {nonlinear precoding, linear precoding, linear precoding, nonlinear precoding}.

The embodiment of the present application indicates the precoding mode in an explicit manner. Therefore, the terminal device can directly determine the precoding mode corresponding to each resource unit according to the second indication information, and does not need an additional calculation process, thereby reducing implementation complexity.

The network device sends, by using the first resource unit, a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence, where a phase difference between the DMRS sequence and the PTRS sequence is used to indicate that the first terminal device uses the first resource unit to communicate The precoding mode, and/or the power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.

The network device sends a PTRS sequence by using a plurality of symbols in the first resource unit, where the plurality of symbols includes a first symbol set and a second symbol set, a phase difference of the PTRS sequence on the first symbol set and the second a phase difference of the PTRS sequence on the set of symbols is used to indicate a precoding manner when the first terminal device communicates using the first resource unit; and/or, the network device sends the first terminal device to the first terminal device by using the first resource unit The power adjustment method when sending data.

The embodiment of the present application implicitly indicates the precoding mode and/or the power adjustment mode by referring to the phase difference of the signal sequence. Therefore, the network device does not need to additionally indicate the precoding mode and/or the power adjustment mode by signaling, thereby saving the letter. Make the cost.

With reference to the first aspect, in an implementation manner of the first aspect, the precoding mode when the first terminal device uses the first resource unit to communicate is a non-linear precoding mode, where the method further includes:

Determining, by the network device, a power adjustment manner when the first resource unit sends data to the first terminal device;

The network device sends third indication information to the first terminal device, where the third indication information is used to indicate a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.

With reference to the first aspect, in an implementation manner of the first aspect, the third indication information is in the form of a bitmap, where the number of bits of the third indication information and the resource unit in the scheduling bandwidth of the first terminal device The numbers are equal, wherein each bit in the third indication information is used to indicate a power adjustment manner corresponding to one resource unit.

For example, in the embodiment of the present application, the power adjustment mode of each resource unit may be indicated in the form of a bitmap. For example, if the number of resource units is 4 and four resource units, the bitmap has 4 bits, such as four. When the resource units are all nonlinear precoding, 0110 indicates that the precoding methods on the four resource units are {modulo, power back, power back, modulo}, or {power back, modulo, modulo , power back}; if the precoding mode of the terminal equipment on some of the resource units is linear precoding, the power adjustment mode indicated by the bitmap is invalid.

In the embodiment of the present application, the power adjustment mode is indicated in an explicit manner. Therefore, the terminal device can directly determine the power adjustment mode corresponding to each resource unit according to the second indication information, and the implementation complexity can be reduced without an additional calculation process.

The network device sends a fourth indication information to the first terminal device, where the fourth indication information is used to indicate a modulation and coding mode MCS corresponding to the first terminal device, where the MCS is used to indicate that the network device passes the first resource. The power adjustment mode when the unit transmits data to the first terminal device.

In the embodiment of the present application, the MCS implicitly indicates the power adjustment mode. Therefore, the network device does not need to additionally indicate the power adjustment mode by signaling, which can save signaling overhead.

In a second aspect, a method for data transmission is provided, the method includes: receiving, by a terminal device, data sent by a network device by using the first resource unit; the terminal device demodulating the data by using a first precoding manner corresponding to the terminal device The first precoding mode is determined by the network device according to a plurality of channel correlation values of the plurality of terminal devices on the first resource unit, where the plurality of terminal devices include devices that use the first resource unit to communicate, Each of the plurality of channel correlation values represents a degree of interference between two of the plurality of terminal devices.

In the embodiment of the present application, the network device determines the precoding mode by using the resource unit as the granularity. The precoding method corresponding to the same terminal device on different resource units may be different, and the terminal device in the prior art is determined to determine a full bandwidth. The shortcomings of the precoding method. Therefore, in the embodiment of the present application, the terminal device demodulates data in a precoding manner corresponding to the resource unit on different resource units, thereby improving system performance.

It should be understood that the method on the terminal device side described in the second aspect corresponds to the method for describing the network device in the first aspect, and the method on the terminal device side may refer to the description on the network device side to avoid repetition, and the detailed description is omitted here as appropriate.

With reference to the second aspect, in an implementation manner of the second aspect, the method further includes:

The terminal device receives the first indication information sent by the network device, where the first indication information is used to indicate the size of the first resource unit.

The terminal device determines a size of the first resource unit according to a preset parameter, where the preset parameter includes a size of a scheduling bandwidth of the terminal device, and a subcarrier spacing in a scheduling bandwidth of the terminal device.

The terminal device receives the second indication information sent by the network device, where the second indication information is used to indicate the first precoding mode.

With reference to the second aspect, in an implementation manner of the second aspect, the second indication information is in the form of a bitmap, where the number of bits of the second indication information is equal to the number of resource units in the scheduling bandwidth of the terminal device. And wherein each bit in the second indication information is used to indicate a precoding manner corresponding to one resource unit.

Receiving, by the terminal device, a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence sent by the network device by using the first resource unit, where a phase difference between the DMRS sequence and the PTRS sequence is used to indicate that the terminal device uses the first resource The precoding method in unit communication, and/or the power adjustment mode when the network device transmits data to the terminal device through the first resource unit.

The terminal device receives a PTRS sequence that is sent by the network device by using multiple symbols in the first resource unit, where the multiple symbols include a first symbol set and a second symbol set, and the phase of the PTRS sequence on the first symbol set a phase difference between the difference and the PTRS sequence on the second set of symbols is used to indicate a precoding manner when the terminal device communicates using the first resource unit, and/or the network device sends the terminal to the terminal by using the first resource unit The power adjustment method when the device sends data.

With reference to the second aspect, in an implementation manner of the second aspect, the precoding mode when the terminal device uses the first resource unit to communicate is a non-linear precoding mode, where the method further includes:

The terminal device receives the third indication information that is sent by the network device, where the third indication information is used to indicate a power adjustment mode when the network device sends data to the terminal device by using the first resource unit.

In conjunction with the second aspect, in an implementation of the second aspect,

The third indication information is in the form of a bitmap, and the number of bits of the third indication information is equal to the number of resource units in the scheduling bandwidth of the terminal device, where each bit in the third indication information is used to indicate The power adjustment method corresponding to a resource unit.

The terminal device receives the fourth indication information that is sent by the network device, where the fourth indication information is used to indicate the modulation and coding mode MCS corresponding to the terminal device, where the MCS is used to indicate that the network device uses the first resource unit to The power adjustment method when the terminal device sends data.

In a third aspect, a communication device is provided, comprising various modules or units for performing the method of the first aspect or any of the possible implementations of the first aspect.

In one implementation, the communication device is a network device.

In a fourth aspect, a communication device is provided, the terminal device comprising various modules or units for performing the method of any of the possible implementations of the second aspect or the second aspect.

In one implementation, the communication device is a terminal device.

In a fifth aspect, a communication device is provided, including a transceiver, a processor, and a memory. The processor is for controlling transceiver transceiver signals for storing a computer program for calling and running the computer program from memory such that the network device performs the method of the first aspect and its possible implementations.

In one implementation, the communication device is a network device.

In a sixth aspect, a communication device is provided, including a transceiver, a processor, and a memory. The processor is for controlling transceiver transceiver signals for storing a computer program for calling and running the computer program from memory such that the terminal device performs the method of the second aspect and its possible implementations.

In one implementation, the communication device is a terminal device.

According to a seventh aspect, there is provided a computer readable medium having stored thereon a computer program, which when executed by a computer, implements the method of any of the possible implementations of the first aspect or the first aspect.

According to an eighth aspect, there is provided a computer readable medium having stored thereon a computer program, which when executed by a computer, implements the method of any of the possible implementations of the second aspect or the second aspect.

In a ninth aspect, a computer program product is provided, the computer program product being executed by a computer to implement the method of any of the first aspect or the first aspect of the first aspect.

According to a tenth aspect, there is provided a computer program product, which when executed by a computer, implements the method of any of the possible implementations of the second aspect or the second aspect.

In an eleventh aspect, a processing apparatus is provided, including a processor and an interface;

The processor, for performing the method as an execution body of the method in any of the first aspect, the second aspect, the first aspect, or the second aspect, wherein the related data interaction process (for example, Or receive data transmission) is done through the above interface. In the specific implementation process, the foregoing interface may further complete the data interaction process by using a transceiver.

It should be understood that the processing device in the eleventh aspect may be a chip, and the processor may be implemented by using hardware or by software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; When implemented by software, the processor can be a general purpose processor implemented by reading software code stored in a memory, which can be integrated in the processor and can exist independently of the processor.

According to a twelfth aspect, there is provided a system comprising the aforementioned network device and terminal device.

DRAWINGS

FIG. 1 is a schematic diagram of a scenario of a communication system applicable to an embodiment of the present application.

2 is a schematic diagram of a data processing process in an embodiment of the present application.

FIG. 3 is a flow chart of a communication method according to an embodiment of the present application.

4 is a schematic diagram of a constellation diagram in accordance with one embodiment of the present application.

FIG. 5 is a schematic diagram of a communication device in accordance with an embodiment of the present application.

FIG. 6 is a schematic diagram of a communication device according to another embodiment of the present application.

FIG. 7 is a schematic diagram of a network device according to an embodiment of the present application.

FIG. 8 is a schematic diagram of a terminal device according to an embodiment of the present application.

detailed description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The embodiments of the present application are applicable to various communication systems, and therefore, the following description is not limited to a specific communication system. For example, the embodiment of the present application can be applied to a long term evolution (LTE) system, a frequency division duplex (FDD) system, a time division duplex (TDD), a wireless local area network (wireless local area). Networks, WLAN), wireless fidelity (WiFi), and next-generation communication systems, ie, 5th generation (5G) communication systems, such as the new radio (NR) system.

In the embodiment of the present application, the network device may be a network device in a 5G network, for example, a transmission and reception point (TRP or transmission point TP) in the NR system, a base station (gNB) in the NR system, and an NR system. A radio frequency unit, such as a remote radio unit, one or a group of base stations (including multiple antenna panels), and the like in a 5G system. It can also be a wearable device or an in-vehicle device. Different network devices may be located in the same cell or in different cells, and are not limited herein.

In some deployments, a gNB may include a centralized unit (CU) and a distributed unit (DU). The gNB may also include a radio unit (RU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU implements radio resource control (RRC), the function of the packet data convergence protocol (PDCP) layer, and the DU implements the wireless chain. The functions of the radio link control (RLC), the media access control (MAC), and the physical (PHY) layer. Since the information of the RRC layer eventually becomes information of the PHY layer or is transformed by the information of the PHY layer, high-level signaling, such as RRC layer signaling or PHCP layer signaling, can also be used in this architecture. It is considered to be sent by the DU or sent by the DU+RU. It can be understood that the network device can be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in the access network RAN, and the CU may be divided into network devices in the core network CN, which is not limited herein.

In the embodiment of the present application, the terminal device may also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, and a terminal. , a wireless communication device, a user agent, or a user device. The access terminal may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, household appliances, wearable devices, drone devices, and terminal devices in future 5G networks or future extended public land mobile communication networks (public The terminal device and the like in the land mobile network (PLMN) are not limited in this embodiment of the present application.

By way of example and not limitation, in the embodiment of the present application, the terminal device may also be a wearable device. A wearable device, which can also be called a wearable smart device, is a general term for applying wearable technology to intelligently design and wear wearable devices such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are more than just a hardware device, but they also implement powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-size, non-reliable smartphones for full or partial functions, such as smart watches or smart glasses, and focus on only one type of application, and need to work with other devices such as smartphones. Use, such as various smart bracelets for smart signs monitoring, smart jewelry, etc.

FIG. 1 is a schematic diagram of a scenario of a communication system applicable to an embodiment of the present application. As shown in FIG. 1, the communication system 100 includes a network device 102, which may include multiple antenna groups. Each antenna group may include multiple antennas, for example, one antenna group may include

antennas

104 and 106, another antenna group may include

antennas

106 and 110, and an additional group may include

antennas

112 and 114. Two antennas are shown in Figure 1 for each antenna group, although more or fewer antennas may be used for each group. Network device 102 may additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which may include multiple components related to signal transmission and reception (eg, processor, modulator, multiplexer, solution) Tuner, demultiplexer or antenna, etc.).

Network device 102 can communicate with a plurality of terminal devices, such as terminal device 116 and terminal device 122. However, it will be appreciated that network device 102 can communicate with any number of terminal devices similar to

terminal device

116 or 122.

Terminal devices

116 and 122 may be, for example, cellular telephones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable for communicating over wireless communication system 100. device.

As shown in FIG. 1, terminal device 116 is in communication with

antennas

112 and 114, wherein

antennas

112 and 114 transmit information to terminal device 116 over forward link 116 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with

antennas

104 and 106, wherein

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

For example, in a frequency division duplex (FDD) system, for example, the forward link 116 can utilize a different frequency band than that used by the reverse link 120, and the forward link 124 can utilize the reverse link. 126 different frequency bands used.

As another example, in a time division duplex (TDD) system and a full duplex system, the forward link 116 and the reverse link 120 can use a common frequency band, a forward link 124, and a reverse link. Link 126 can use a common frequency band.

Each set of antennas and/or regions designed for communication is referred to as a sector of network device 102. For example, the antenna group can be designed to communicate with terminal devices in sectors of the network device 102 coverage area. In the process in which network device 102 communicates with

terminal devices

116 and 122 via

forward links

116 and 124, respectively, the transmit antennas of network device 102 may utilize beamforming to improve the signal to noise ratio of

forward links

116 and 124. In addition, when the network device 102 uses beamforming to transmit signals to the randomly dispersed

terminal devices

116 and 122 in the relevant coverage area, the network device 102 uses a single antenna to transmit signals to all of its terminal devices. Mobile devices are subject to less interference.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device can encode the data for transmission. In particular, the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be included in a transport block (or multiple transport blocks) of data that may be segmented to produce multiple code blocks.

In addition, the communication system 100 may be a public land mobile network PLMN network or a device to device (D2D) network or a machine to machine (M2M) network or other network, and FIG. 1 is merely an example for convenience of understanding. A simplified schematic diagram of the network may also include other network devices, which are not shown in FIG.

FIG. 2 shows the main steps of a data processing process performed by a transmitting end (for example, a network device) before data is transmitted by orthogonal frequency division multiplexing (OFDM) symbols. As shown in FIG. 2, the obtained codewords from the upper layer (for example, the media access control (MAC) layer) are subjected to channel coding, and the obtained codewords are mapped to one or more after scrambling, modulation, and layer mapping. The layer is then subjected to precoding processing, resource unit mapping, and finally the modulated symbol is transmitted through the antenna port.

Accordingly, the receiving end (e.g., the terminal device) can perform demodulation of data. The specific data processing procedures described above can be referred to the description in the existing standards.

The main function of MIMO technology is to provide spatial diversity and spatial multiplexing gain. MIMO uses multiple transmit antennas to transmit signals with the same information through different paths, and at the receiving end can obtain multiple independent fading of the same data symbol. Signals, thereby achieving improved reception reliability for diversity, spatial diversity of MIMO techniques can be used to combat channel fading.

The precoding technology can not only effectively suppress multiple user interferences in the MIMO system, but also significantly improve the system capacity while greatly simplifying the receiver algorithm. The precoding uses the known channel state information CSI to preprocess the transmitted signal at the transmitting end, so that the processed transmitted signal can adapt to the channel environment, thereby eliminating interference between users, reducing the system error rate and improving the system. Capacity, reduce transmit power, etc.

The performance and complexity of different precoding methods are different from each other. Typical precoding methods can be divided into linear precoding and nonlinear precoding. Each type of precoding has its suitable working scenario. Linear precoding and nonlinear precoding are introduced separately below.

Linear precoding is the linear processing of the acquired channel state information. A typical linear precoding algorithm may include zero forcing (ZF) precoding and its various improved algorithms, minimum mean square error (MMSE) precoding, block diagonalization (BD). Precoding and optimization of signal to leakage noise ratio (SLNR) precoding. The advantage of linear precoding is that it has low operation complexity, simple implementation and strong practicability, but it is greatly affected by channel correlation. Because the channel matrix H is ill, the equivalent noise at the receiving end will increase, which will affect the demodulation. And detection leads to loss of system performance.

Nonlinear precoding is a non-linear operation of the channel matrix (such as introducing iteration, interference cancellation, modulo, power back-off). Typical nonlinear precoding methods can include dirty paper coding (DPC), modular algebra Precoding (tomlinson harashima precoding, THP) and vector perturbation (VP) precoding. The advantage of nonlinear precoding is that it has excellent performance, is less affected by channel correlation, and has the disadvantage of high complexity.

Since the performance and complexity of the linear precoding and nonlinear precoding methods are different, the network device needs to determine the precoding method for data processing as linear precoding mode or non according to different channel conditions, balancing complexity and performance. Linear precoding method.

In the existing LTE protocol, the network device can determine the precoding mode of the terminal device in the full bandwidth according to the channel correlation of the terminal device in full bandwidth. In LTE, the channel correlation between the terminal devices is small due to the small system bandwidth. The change in the full bandwidth is small, and the pre-coding mode between each terminal device can be accurately determined by using the full-bandwidth channel correlation. However, in the fifth generation of new air interface technology, the system bandwidth can be as high as 400M, and the maximum bandwidth supported by each terminal device is greatly different. At this time, the channel correlation between terminal devices is difficult to be consistent in the system bandwidth. At this time, the pre-coding mode of the terminal device is still determined by using the full-bandwidth channel correlation, which may result in inaccurate selection of the pre-coding mode and affect system performance.

In view of the above problems, the embodiment of the present application proposes a method for determining a precoding method. Specifically, the network device determines, according to the channel correlation value of the terminal device on the resource unit, a precoding manner corresponding to each terminal device on the resource unit. In the embodiment of the present application, the network device determines the precoding mode by using the resource unit as the granularity. The precoding method corresponding to the same terminal device on different resource units may be different, and the terminal device in the prior art is determined to determine a full bandwidth. The shortcomings of the precoding method. Therefore, the embodiment of the present application determines the precoding mode corresponding to the terminal device in each resource unit by using the channel correlation of the terminal device on different resource units, thereby improving system performance.

It should be understood that the precoding mode corresponding to the terminal device in the embodiment of the present application indicates the precoding mode used by the network device to send data to the terminal device by using the first resource unit.

It should be understood that the term "precoding mode" in this document may also be referred to as a precoding scheme, a precoding mode, a precoding class or a precoding type, etc., and the implementation of the present application is not limited thereto.

The term "power adjustment mode" in this document may also be referred to as a power adjustment scheme, a power adjustment mode, a power adjustment category, or a power adjustment type, etc., and the implementation of the present application is not limited thereto.

It should be understood that the “full bandwidth” in the embodiment of the present application may indicate the system bandwidth, or the total bandwidth that the system can schedule. The embodiment of the present application is not limited thereto.

Hereinafter, for ease of understanding and explanation, the execution process and actions of the communication method of the present application in the communication system will be described by way of example and not limitation.

FIG. 3 is a schematic flow chart of a method of communication according to an embodiment of the present application. The method shown in FIG. 3 describes the method of the embodiment of the present application from the perspective of interaction between the network device and the terminal device. Specifically, the method shown in FIG. 3 includes:

310. The network device determines a plurality of channel correlation values of the plurality of terminal devices on the first resource unit.

The plurality of terminal devices include devices that communicate using the first resource unit, and each of the plurality of channel correlation values represents a degree of interference between two of the plurality of terminal devices .

It should be understood that the value of the channel correlation indicates the degree of interference between two terminal devices communicating using the first resource unit. When the channel correlation value is larger, the degree of interference between the two terminal devices is greater, and vice versa. The smaller the channel correlation value, the smaller the degree of interference between the two terminal devices.

By way of example and not limitation, an explanation of the channel correlation corresponding to a plurality of terminal devices communicating using the first resource unit in the embodiment of the present application is described below:

It is assumed that the number of receiving antennas of each terminal device is 1, and the channel between the network device and the kth terminal device is represented as Hk, and the dimension is 1*Nt, where Nt is the number of transmitting antennas of the network device. Performing a singular value decomposition (SVD) decomposition on the channel Hk to obtain a right-right singular vector of the kth terminal device, that is, a right singular vector corresponding to the largest eigenvalue, the right singular vector indicating that the data of the kth terminal device is The direction of transmission in space.

Then the channel correlation between the two terminal devices refers to: the modulus of the main right singular vector inner product between the two terminal devices or the main right singular vector of one of the two terminal devices in another terminal device The projection length on the main right singular vector, the smaller the modulus value or the smaller the projection length, the lower the channel correlation, otherwise the channel correlation is higher.

Since the lengths of the right singular vectors are the same, both are 1, so the factor affecting the inner product size is the angle between the data transmission directions of the terminal devices. The closer the angle is to 0° or 180°, the more the modulus of the inner product is. Large, the channel correlation is larger; the closer the angle is to 90° or 270°, the smaller the modulus of the inner product is, and the channel correlation is about small.

In this embodiment, the resource unit may represent a bandwidth resource. For example, one resource unit is a bandwidth resource in the system bandwidth. For example, one resource unit is a plurality of resource blocks (RBs) or several resource blocks. A resource block group (RBG), or an absolute bandwidth resource (MHz), for example, a 5 megabit bandwidth, a 10 megabit bandwidth, etc., is not limited thereto. In other words, multiple resource units can be included in the system bandwidth. For example, in a 400M system bandwidth, resource units can be divided into 10M bandwidth, 20M bandwidth, and 50M bandwidth. That is to say, for each resource unit, the network device needs to perform the same processing as the first resource unit.

It should be understood that the value of the first resource unit may be less than or equal to the minimum scheduling bandwidth of the terminal device. Optionally, the scheduling bandwidth of any terminal device may be an integer multiple of the first resource unit.

It should be understood that, in this context, the resource unit may also be referred to as a sub-band, a resource granularity, or a resource set, and the like, and the embodiment of the present application is not limited thereto.

In the embodiment of the present application, the size of the first resource unit may be determined in multiple manners. The details will be described separately below.

method one:

The size of the first resource unit is preset, that is, the size of the first resource unit is the system default. In this case, the network device and the terminal device know the size of the first resource unit in advance, and it is not necessary to determine the size of the first resource unit. The network device may directly determine the precoding mode by using the method in the embodiment of the present application according to the default first resource unit size. Correspondingly, the terminal device can directly demodulate the received data by using the method of the embodiment of the present application according to the default first resource unit size.

Method 2:

The size of the first resource unit is determined by the network device. In this case, the network device first determines the size of the first resource unit, and then needs to indicate the size of the resource unit of the terminal device.

Correspondingly, as another embodiment, the method further includes:

The network device determines a size of the first resource unit;

Correspondingly, the terminal device receives the first indication information.

As an example and not by way of limitation, in the second mode, the network device determines a specific possible implementation manner of the size of the first resource unit:

In a possible implementation manner, the network device determines the size of the first resource unit according to the degree of fluctuation of channel correlation of the total bandwidth of each two terminal devices.

Specifically, the slower the channel correlation change of the two terminal devices on the full bandwidth, the larger the resource unit, and the faster the channel correlation of the two terminal devices on the full bandwidth changes, the smaller the resource unit.

Triggered by the network device: the network device according to the obtained channel state information of each terminal device (the channel state information may include at least one of the following: a channel estimated by a Sounding Reference Signal (SRS), and feedback by the terminal device Channel state information (CSI), channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), interference information, etc. The channel state information is compared. When the difference exceeds a certain threshold, the size of the resource unit and the precoding mode are re-determined.

Triggered by the terminal device: the terminal device acquires its current channel state information (the channel state information may include at least one of: a demodulation reference signal (DMRS) and/or a channel state information reference signal (channel state information) Referencesignal, CSI-RS) and/or phase tracking reference signal (PTRS) and/or other reference signal (RS) estimated channel, etc.) compared with previous channel state information, when the difference After a certain threshold is exceeded, the request for updating the size of the resource unit and the precoding method, and/or the recommended resource unit size (the message content may be an absolute value of the resource unit size, or an index of the resource unit size) may be sent to the network device. Or number). The network device may choose to update or not update the resource unit size after receiving the request and/or suggested value.

Therefore, the network device or the terminal device flexibly updates the resource unit size according to the channel state information by using the network device or the terminal device, and can determine the size of the resource unit corresponding to the current channel state in time when the channel state changes greatly. The precoding method is determined according to the size of the updated resource unit, which can improve system performance.

The foregoing describes a manner of determining the size of a resource unit. Alternatively, in another possible implementation manner, the network device determines the size of the first resource unit according to the size of the scheduling bandwidth of the multiple terminal devices.

Specifically, the network device may determine the size of the resource unit according to the scheduling bandwidth of the multiple terminal devices. The larger the scheduling bandwidth of the terminal device, the larger the absolute bandwidth (in MHz) occupied by the resource unit or the larger the number of RBs included, the smaller the scheduling bandwidth of the terminal device, the absolute bandwidth occupied by the resource unit (in MHz) or The smaller the number of RBs included.

It should be understood that, in actual applications, the scheduling bandwidths of the multiple terminal devices may not be completely the same, and the network device may determine the size of multiple different resource units according to the scheduling bandwidth of different terminal devices. In this case, the network The device may determine a value as the final resource unit size according to the size of the plurality of different resource units. For example, the minimum value, the maximum value, the intermediate value, or the average value of the multiple values are taken as the size of the final resource unit, and the embodiment of the present application is not limited thereto. It should also be understood that when the scheduling bandwidths of the scheduled multiple terminal devices are the same, the resource unit size can be directly determined by the scheduling bandwidth, that is, both the network device and the terminal device can determine the resource unit size according to the scheduling bandwidth, and no additional Signaling indicates the size of the resource unit.

It should be understood that once the size of the resource unit is determined, the size of the resource unit is equal across the entire system bandwidth.

Alternatively, in another possible implementation manner, the network device determines a size of the first resource unit according to a size of a subcarrier interval in a scheduling bandwidth of the multiple terminal devices. It should be understood that the subcarrier spacing in the scheduling bandwidth of the plurality of terminal devices is generally the same.

Specifically, the network device may determine the size of the resource unit according to the subcarrier spacing of the terminal device. For example, the network device may determine a resource unit size according to the subcarrier spacing in the scheduling bandwidth of the terminal device. For example, the larger the subcarrier spacing in the scheduling bandwidth of the terminal device, the fewer the number of RBs included in the resource unit; The smaller the interval, the more RBs the resource unit contains; or the larger the subcarrier spacing in the scheduling bandwidth of the terminal device, the larger the absolute bandwidth (in MHz) occupied by the resource unit, and the smaller the subcarrier spacing of the terminal device. The absolute bandwidth (in MHz) occupied by the resource unit is smaller. Optionally, the network device may determine a resource unit size corresponding to the current subcarrier according to a one-to-one correspondence between the preset multiple subcarrier spacings and the multiple resource unit sizes. It should be understood that the sub-carrier spacing of the devices of the multiple terminals in the resource unit is the same, and the resource unit size can be directly determined by the sub-carrier spacing, that is, the network device and the terminal device can determine the resource unit size according to the sub-carrier spacing, and the Additional signaling indicates the size of the resource unit.

Alternatively, in another possible implementation manner, the network device selects one of the preset multiple resource unit size values as the size of the first resource unit.

For example, the resource unit size includes a resource unit size (Resource Block Group, RBG), where the value of n may be a positive integer, or may be a positive integer satisfying a power of 2; or The resource unit size set includes a resource unit size of n resource blocks (Resource Blocks, RBs), where n may be an integer, or may be a positive integer satisfying a power of 2; or a resource included in a set of resource unit sizes The unit size is 1/n*BW _sys , where BW _sys is the system bandwidth in mega (M), such as BW _sys =400M, n is a positive integer satisfying the power of 2, such as n=1, 2, 4 , 8, ..., that is, the size of the resource unit can be 400M, 200M, 100M, 50M, ....

Optionally, as another embodiment, the network device selects one of the preset values of the multiple resource unit sizes as the size of the first resource unit, including:

The network device is configured according to at least one of a predetermined plurality of resource unit sizes according to at least one of a degree of fluctuation of channel correlation between the terminal devices, a size of a scheduling bandwidth of the terminal device, and a size of a subcarrier interval in a scheduling bandwidth of the terminal device. One of the values is selected as the size of the first resource unit.

It should be noted that when the network device selects one of the multiple resource unit size values (that is, the set of resource unit sizes) as the resource unit size, the network device may also select the state of the current channel, such as according to the channel correlation between the terminal devices. Sex, select the closest value in the collection or the closest value after the logarithm as the resource unit size. For example, the resource unit size in the set is expressed as {SubBW _i }, i=1, 2, ..., and the resource unit size determined according to the channel correlation between the terminal devices is x, and the closest resource unit size may be satisfied (x) /SubBW _i ) The largest _{i in} ≤1, which can also satisfy the minimum i of (x/SubBW _i )≥1, and can also be the i that makes (x/SubBW _i ) closest to 1, such as abs((x/) SubBW _i )-1) The smallest i, the embodiment of the present application is not limited thereto. The following example is described in detail: If the resource unit size set is {400M, 200M, 100M, 50M}, when the resource unit size determined according to the channel correlation between the terminal devices is less than 50M, one of the alternatives is to select 50M. The size of the resource unit; when the resource unit size determined by the channel correlation between the terminal devices is greater than 75M and less than 150M, one of the alternatives is to select 100M as the resource unit size.

Similarly, in the embodiment of the present application, the relationship between the subcarrier spacing and/or the scheduling bandwidth size and the resource unit size in the set may also be established or configured in advance, and then the network device selects the subcarrier spacing and/or the scheduling bandwidth according to the current data. One of the resource unit size sets determines the size of the resource unit.

Method three:

The network device and the terminal device determine the size of the first resource unit in the same manner or rule. In this case, the same resource unit size can be determined by the same method or rule at both ends of the transceiver. Therefore, the network device does not need to send an indication of the size of the additional resource unit to the terminal device.

Correspondingly, as another embodiment, the method further includes:

Correspondingly, the terminal device may also determine the size of the first resource unit according to preset parameters.

Specifically, the network device may determine the size of the resource unit according to the preset parameter by using a set of preset manners or rules that are the same as the terminal device.

For example, after the transceiver end has determined or agreed on the relationship between the subcarrier spacing and/or the scheduling bandwidth size and the resource unit size in the set, the resource unit size used to determine the precoding mode when the data is currently transmitted may be separated by the subcarrier spacing and/or Or scheduling bandwidth implicit indication, for example, if the resource unit size in the set is {25 RB, 50 RB, 100 RB}, respectively corresponding to the subcarrier spacing {120k, 60k, 30k}; if the resource unit size It is {16 RBs, 32 RBs, 64 RBs, 128 RBs}, corresponding to the subcarrier spacing {240k, 120k, 60k, 30k}, and so on. In this case, the network device and the terminal device may determine the size of the resource unit corresponding to the subcarrier according to the correspondence between the subcarrier spacing and the size of the resource unit.

320. The network device determines, according to the multiple channel correlation values, a precoding manner corresponding to each of the plurality of terminal devices.

The first terminal device corresponds to the first precoding mode, and the first terminal device is any one of the multiple terminal devices.

By way of example and not limitation, a scheme in which a network device determines a precoding manner corresponding to each terminal device is described below:

Assuming that five terminal devices communicate using the first resource unit, and the number of data layers of each terminal device is a single layer, the network device transmits a total of five layers of data.

The network device can determine the precoding mode corresponding to each terminal device by the following steps:

Step 1: The network device obtains the channels of the five terminal devices, respectively, channel 1, channel 2, ..., channel 5

Step 2: The network device separately calculates the channel correlation value between each two terminal devices, and obtains a correlation matrix R with a dimension of N*N, that is, 5*5, where R _pq represents the pth terminal device and the qth terminal device. The channel correlation, from which it can be seen that the diagonal element of R is 1, and is symmetric about the diagonal, that is, R _pq = R _qp .

Assuming that one resource unit includes multiple RBGs, a method for determining the correlation matrix is to first determine the correlation of the jth RBG last UE when the ith TTI is first, and then average the RBG to obtain a resource unit. Correlation matrix R ⁽ⁱ⁾ , where i represents the index of the TTI and j represents the index of the RBG in a resource unit

among them

It can be expressed as [v ₁ , v ₂ , ... v ₅ ], where v _k represents the right singular vector of the jth terminal device at the jth RBG of the i th TTI, the dimension is N _t *1, N _t represents The number of transmit antennas of the network device,

Representation matrix

Each element in the equation is a complex modulus value, for example, the modulus value of a+j*b is sqrt(a^2+b^2).

It should be understood that, if the precoding mode is re-allocated with multiple time slots periodically in the embodiment of the present application, the correlation matrix acquired in each time slot is used.

There may also be an alpha filtering operation, where α is a filtering factor, and the value of α may be configured by the network device or may be a preset value.

For example, the correlation matrix obtained in step 2 is:

Step 3: Select the terminal device of the first layer.

That is to say, the network device needs to select the terminal devices of each layer according to the correlation matrix.

By way of example and not limitation, several ways of selecting a first layer terminal device are described below.

Method A: Calculate the average correlation between each terminal device and other terminal devices, and select the terminal device with the least correlation as the first layer terminal device.

For example, the average channel correlation values of the five terminal devices are: 0.386, 0.640, 0.456, 0.664, and 0.522, respectively.

The first terminal device has the smallest average correlation, so it is the first layer terminal device.

It should be understood that the result of calculating the average correlation of the terminal device includes the UE's own correlation with itself, that is, the diagonal element is included, and the average correlation of the terminal device is sum(R)/5, where sum( R) means summing each row or column of the matrix. Optionally, as another solution, when calculating the average correlation of the terminal device, the diagonal element may not be averaged, that is, the average correlation of the computing terminal device is (sum(R)-1)/4.

Mode B: The threshold of the predefined or default or configuration correlation is λ _R , and the size of R _ij is compared, and the channel correlation between each terminal device and other terminal devices is smaller than λ _R (or less than or equal to λ _R ). The number of correlations, the most selected terminal device is the first layer terminal device

Assume that λ _R = 0.5, the channel correlations with other terminal devices in the five terminal devices are less than (or less than or equal to) the number of λ _R is (ie, less than the other elements of the R elements in each column other than the diagonal elements) The number of elements of λ _R ): 4, 2, 3, 2, 3, so the first terminal device is the first layer terminal device

Note: if there are multiple terminal devices whose channel correlation values are less than or equal to the same number of λ _Rs , the correlation and the smallest terminal devices among the plurality of terminal devices are selected, or the terminal device with the smallest average correlation is the first The layer terminal device, the embodiment of the present application is not limited thereto.

Mode C: The terminal device with the smallest label among the plurality of terminal devices scheduled by the network device is the first layer terminal device, that is, the terminal device 1.

Since each terminal device corresponds to one identifier or label, for example, the label of the terminal device 1 to the terminal device 5 is other numbers 1 to 5, the network device can select the terminal device with the smallest label, that is, the terminal device 1 as the first A layer of terminal equipment.

Step 4: Select the terminal devices of other layers.

The network device may sort the scheduling terminal devices according to channel correlation. For example, the terminal devices ranked as i are scheduled at the i-th layer, and the pre-coding manner of each terminal device is determined according to the channel correlation. Specifically, the network device sequentially confirms the second layer, the third layer, and the nth layer terminal device. For example, based on the sorted i-1 layer terminal device, the average correlation between the remaining terminal devices and the currently sorted pre-i-1 layer terminal devices is sequentially calculated, and the terminal device with the smallest average correlation is selected as the i-th. The terminal device of the layer, and compares the average channel correlation value of the i-th terminal device corresponding to the currently sorted pre-i-1 layer terminal device with the pre-defined or configured linear precoding correlation threshold λ _NonTHP , If the average average channel correlation value is less than or equal to (or less than) λ _NonTHP , the precoding mode corresponding to the i th layer terminal device is a linear precoding mode, otherwise it is a nonlinear precoding mode.

The following is a specific example of determining the second to fifth layers of the network device by taking λ _NonTHP as 0.4 as an example.

Determining the terminal device of the second layer: the correlation between the remaining terminal devices (the terminal device 2 to the terminal device 5) and the first layer terminal device is [0.15, 0.14, 0.40, 0.24], respectively, where the correlation with the terminal device 1 is The smallest terminal device is the terminal device 3, and thus the terminal device 3 is a second layer terminal device.

Determining the terminal device of the third layer: between the remaining terminal devices (terminal device 2, terminal device 4, terminal device 5) and the first layer terminal device (terminal device 1) and the second layer terminal device (terminal device 3) The average correlation is [0.5, 0.32, 0.145], respectively, so the terminal device 5 is the terminal device of the third layer.

And so on, the final determined terminal device order and the average channel correlation used in determining the order are: [terminal device 1 (0.386), terminal device 3 (0.14), terminal device 5 (0.145), terminal device 2 (0.4733) ), the terminal device 4 (0.58)], wherein the average correlation between the terminal device 2 and the terminal device 4 is greater than λ _NonTHP , and therefore, the precoding method corresponding to the terminal device 2 and the terminal device 4 is nonlinear precoding. The average correlation between the terminal device 3 and the terminal device 5 is less than λ _NonTHP , and therefore, the precoding method corresponding to the terminal device 3 and the terminal device 4 is linear precoding. The terminal device 1 is located at the first layer and is not interfered by other terminal devices. Therefore, the precoding mode adopted by the terminal device 1 can be selected in a linear and nonlinear precoding manner according to actual conditions, when the remaining When the other terminal equipment is non-linearly precoded or the first terminal equipment behind it is nonlinear precoding, the terminal equipment 1 can select nonlinear precoding, and the first terminal equipment behind it is linear pre- At the time of encoding, the terminal device 1 selects linear precoding.

It should be understood that the foregoing determining the precoding mode according to the channel correlation is only an example. In actual situations, the precoding mode corresponding to the terminal device may be determined according to other parameters of the channel, such as the energy of the channel, the signal to interference and noise ratio of the terminal device, or the like; or The precoding method corresponding to the terminal device is determined by using other scheduling algorithms and the like, and the embodiment of the present application is not limited thereto.

It should be understood that after the network device determines the precoding mode corresponding to the terminal device, the network device needs to indicate the precoding mode corresponding to the corresponding terminal device.

Optionally, in the embodiment of the present application, the network device may explicitly indicate the precoding mode, or may implicitly indicate the precoding mode.

The scheme of explicitly indicating the precoding method in the embodiment of the present application is first introduced below.

Correspondingly, as another embodiment, the method may further include:

Optionally, as an embodiment, the second indication information is in the form of a bitmap, where the number of bits of the second indication information is equal to the number of resource units in the scheduling bandwidth of the first terminal device, where the Each bit in the two indication information is used to indicate a precoding manner corresponding to one resource unit.

The embodiment of the present application indicates the precoding mode in an explicit manner. Therefore, the terminal device can directly determine the precoding mode corresponding to each resource unit according to the second indication information, and does not need an additional calculation process, thereby reducing implementation complexity. .

The scheme of implicitly indicating the precoding method in the embodiment of the present application is described below.

Correspondingly, as another embodiment, the method may further include:

The network device sends a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence to indicate a precoding manner by using the first resource unit, and a phase difference between the DMRS sequence and the PTRS sequence (also referred to as a DMRS sequence and the PTRS sequence) The phase difference between the transmitted signals is used to indicate a precoding manner when the first terminal device communicates using the first resource unit.

It should be noted that, due to factors such as phase noise, when the transmission signals of the DMRS sequence and the PTRS sequence are completely the same, the received signals of the DMRS sequence and the PTRS sequence have a reception phase error. The reception phase error represents the difference between the phase difference between the received signals of the DMRS sequence and the sequence of the PTRS, and the phase difference between the transmitted signals. For example, when the phase difference of the transmitted signal is 0, the received phase error is equal to the phase difference between the received signal of the DMRS sequence and the PTRS sequence.

In the embodiment of the present application, the precoding manner of the resource unit may be determined by the phase difference of the transmitted signal between the DMRS sequence and the PTRS sequence, such as:

When the range of the received phase error of the above two sequences is (-π/2, π/2), the correspondence between the precoding method and the phase difference of the transmitted signals of the above two sequences is as follows:

Linear precoding: The PTRS sequence and the DMRS sequence are identical, with a phase difference of 0°.

Nonlinear precoding: The PTRS sequence is opposite to the DMRS sequence with a phase difference of 180°.

When the range of the received phase error of the above two sequences is (-π/3, π/3), the phase difference of the transmitted signals of the two sequences may simultaneously indicate the precoding mode and the power adjustment mode, and the precoding method and The correspondence between the sequence phase differences (phase difference of the transmitted signals) is as follows:

Linear precoding: The PTRS sequence and the DMRS sequence are identical, that is, the phase difference is 0°.

Nonlinear precoding, and modulo adjustment power: the phase difference between the PTRS sequence and the DMRS sequence is 2/3π.

Nonlinear precoding, and power back-off adjustment power: PTRS sequence and DMRS sequence phase difference is -2/3π.

It should be understood that the correspondence between the information indicated in the above example and the phase difference is only an example, and the present application is not limited thereto, that is, the correspondence between the indicated information and the phase difference can be arbitrarily exchanged.

The foregoing describes a scheme of phase difference implicit indication precoding by transmitting signals of a PTRS sequence and a DMRS sequence. Alternatively, the implicit indication method may be extended to phase between PTRS sequences on two or more PTRS symbols. difference. Correspondingly, as an embodiment, the method further includes:

The network device sends a PTRS sequence by using a plurality of symbols in the first resource unit, where the plurality of symbols includes a first symbol set and a second symbol set, a phase difference of the PTRS sequence on the first symbol set and the second The transmit signal phase difference of the PTRS sequence on the set of symbols is used to indicate a precoding manner when the first terminal device communicates using the first resource unit.

For example, the sequence phase of PTRS on all symbols is exactly the same to indicate linear precoding; the phase difference between the sequence phase of the PTRS on the odd symbol and the PTRS sequence on the even symbol is 180° indicating nonlinear precoding, or the phase difference is 2/3π indicating non Linear precoding, and modulo adjustment power; the phase difference between the sequence phase of the PTRS on the odd symbol and the PTRS sequence on the even symbol is -2/3π indicating nonlinear precoding, and the power back is adjusted to adjust the power; wherein the odd and even numbers can also be The information is replaced by the first n and the last m, that is, the PTRS sequence on the first n PTRS symbols and the PTRS phase on the last m PTRS symbols represent different information.

The embodiment of the present application indicates the precoding mode in an implicit manner. Therefore, the network device does not need to additionally indicate the precoding mode by signaling, which can save signaling overhead.

It should be noted that in the case of using nonlinear encoding, in order to adjust the power that is lifted due to the subtraction of the interference. The network device needs to adjust the power of the transmitted data. Specifically, the network device can adopt the following two power adjustment modes.

The first type of power adjustment is: modulo mode. The interference-cancelled signal is mapped back into the original constellation where the current modulation scheme is located. The signal formula after modulo can be expressed as:

X'=mod(x,T)=x+n*T+m*j*T,

Where x is the signal after interference cancellation; T is the size of the original constellation, which is related to the modulation order. The modulation order is 2, 4, and 6 is 4/sqrt(2), 8/sqrt(10), respectively. 16/sqrt(42);

X' is the signal after modulo;

n, m is a unique integer value such that both the real part and the imaginary part of X' are in the set [-sqrt(T)/2, sqrt(T)/2];

As shown in FIG. 4, the abscissa represents the in-phase component, and the ordinate represents the orthogonal component. Taking 16QAM as an example, the range of the original constellation is identified by a black solid line frame, and the extended constellation is represented by a dashed box, if the original signal is The constellation point is A. After interference cancellation, it becomes signal B. The modulo operation is to fold B back to the corresponding point within the original constellation map, that is, C shown in the figure, where B is relative position in the extended constellation. The same position as C in the original constellation.

The second power adjustment mode is: power backoff mode. Assuming that each terminal device is a single stream, the signal after the interference cancellation power backoff of the kth terminal device is:

Where a _k represents the original signal of the kth terminal device, and λ _k represents the power backoff factor,

Indicates the total interference of the k-1 terminal devices to the kth terminal device.

In order to enable the terminal device to correctly demodulate data, the network device needs to indicate whether the power adjustment mode of the terminal device is the foregoing first or second power adjustment mode.

Optionally, in the embodiment of the present application, in the non-linear precoding mode, the network device may explicitly indicate the power adjustment mode, or may implicitly indicate the power adjustment mode.

The scheme of explicitly indicating the power adjustment mode in the embodiment of the present application is first described below.

Correspondingly, as another embodiment, the precoding mode when the first terminal device uses the first resource unit to communicate is a non-linear precoding mode, and the method further includes:

Optionally, in another embodiment, the third indication information is in the form of a bitmap, where the number of bits of the third indication information is equal to the number of resource units in the scheduling bandwidth of the first terminal device, where Each bit in the third indication information is used to indicate a power adjustment manner corresponding to one resource unit.

The power adjustment mode is directly indicated in the embodiment of the present application. Therefore, the terminal device can directly determine the power adjustment mode corresponding to each resource unit according to the second indication information, and the implementation complexity can be reduced without an additional calculation process.

The solution in the embodiment of the present application and the implicit indication power adjustment mode are described below.

Correspondingly, as another embodiment, the method further includes:

The network device sends, by using the first resource unit, a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence, and a phase difference between the DMRS sequence and the PTRS sequence (which may also be referred to as a DMRS sequence and a transmission signal of the PTRS sequence) The phase difference is used to indicate a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.

Specifically, the method is the same as the implicit indication method of the precoding method, that is, the power adjustment mode is determined by the phase difference between the DMRS sequence and the PTRS sequence transmission signal.

It should be noted that the received signal of the DMRS sequence and the PTRS sequence itself has a reception phase error due to factors such as phase noise. The reception phase error represents the difference between the phase difference between the received signals of the DMRS sequence and the sequence of the PTRS, and the phase difference between the transmitted signals. For example, when the phase difference of the transmitted signal is 0, the received phase error is equal to the phase difference between the received signal of the DMRS sequence and the PTRS sequence.

For example, when the receiving phase error of the DMRS sequence and the PTRS sequence (the error range due to phase noise) is in the range of (-π/2, π/2), the phase difference between the DMRS sequence and the PTRS sequence (transmitting the signal) The correspondence between the phase difference and the power adjustment is as follows:

Modulating power adjustment: The PTRS sequence and the DMRS sequence are identical, and the phase difference is 0°.

Power back-off adjustment power: The PTRS sequence is opposite to the DMRS sequence, and the phase difference is 180°.

It should be noted that when the range of the received phase error of the two is included in (-π/3, π/3), the phase difference of the transmitted signals of the two sequences may simultaneously indicate the precoding mode and the power adjustment mode. The correspondence between the power adjustment method and the sequence phase difference is as follows:

Nonlinear precoding, and modulo adjustment power: PTRS sequence and DMRS sequence phase difference is 2/3π (pi).

The foregoing describes a scheme of phase difference implicit power adjustment by a PTRS sequence and a DMRS sequence. Alternatively, the implicit indication method may be extended to a phase difference of a transmission signal between PTRS sequences on two or more PTRS symbols. Correspondingly, as an embodiment, the method further includes:

The network device sends a PTRS sequence by using a plurality of symbols in the first resource unit, where the plurality of symbols includes a first symbol set and a second symbol set, a phase difference of the PTRS sequence on the first symbol set and the second The phase difference of the PTRS sequence on the symbol set is used to indicate a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.

For example, the sequence phase of PTRS on all symbols is exactly the same, indicating modulo adjustment power; or,

The phase difference between the sequence phase of the PTRS on the odd symbol and the PTRS sequence on the even symbol is 180°, indicating power back adjustment power; or

A phase difference of 2/3π indicates nonlinear precoding and modulo power adjustment; or

The phase difference between the sequence phase of the PTRS on the odd symbol and the PTRS sequence on the even symbol is -2/3π indicating nonlinear precoding, and the power back is adjusted to adjust the power; wherein the odd and even numbers can also be replaced by the first n and the last m. That is, the PTRS sequence on the first n PTRS symbols and the PTRS phase on the last m PTRS symbols represent different information.

The foregoing describes a scheme in which a phase difference between a PTRS sequence and a DMRS sequence is used, or a phase difference between PTRS sequences on two or more PTRS symbols indicates a constant power adjustment mode. Since the power loss introduced by using the modulo in the embodiment of the present application is different in different modulation modes, specifically, the higher the modulation mode, the power loss introduced by the modulo is about low. Therefore, the power adjustment mode may be selected according to the modulation mode of the terminal device.

Correspondingly, as another embodiment, the method further includes:

For example, the correspondence between MCS and power adjustment mode is as follows:

High-order modulation mode: modulo, if the modulation mode is 16QAM or above, or when the modulation order is greater than or equal to m, the value of m can be 4, 6, ....

Low-order modulation mode: power back-off, if the modulation mode is below QPSK or QPSK, or the power is backed off when the modulation order is less than m, where the value of m can be 4, 6, ....

The power adjustment mode is indicated in an implicit manner in the embodiment of the present application. Therefore, the network device does not need to additionally indicate the power adjustment mode by signaling, which can save signaling overhead.

It should be understood that the foregoing examples of indicating the pre-coding mode and the power-adjusting mode are only for the purpose of facilitating the understanding of the embodiments of the present application, and the embodiments of the present application are not limited to the specific numerical values or specific scenarios illustrated. A person skilled in the art will be able to make various modifications and changes in the embodiments according to the examples given, and such modifications or variations are also within the scope of the embodiments of the present application.

It should be noted that, in some implementation manners, the network device in the embodiment of the present application needs to send two types of information, that is, a precoding method and a power adjustment mode indication (which may be an implicit indication or an explicit indication) to the terminal device. The various indication methods described above may be used in any combination, for example, by way of example and not limitation, the embodiment of the present application may indicate the precoding mode and the power adjustment mode by using any combination of the following:

The explicit method notifies the precoding method, and the implicit method notifies the power adjustment mode, wherein the implicit method can arbitrarily select a combination of any one or more of the implicit indication schemes listed above.

The implicit method notifies the precoding method, wherein the implicit method may select a combination of any one or more of the implicit indication schemes listed above, and the explicit method notifies the power adjustment mode.

The implicit method notifies the precoding mode, and the implicit method notifies the power adjustment mode, wherein the specific indication methods of the two can be combined, for example, the value range of the phase difference of the corresponding sequence transmission signal is included in (-π/3, π/3). The time scenario can also be separated by different methods, such as precoding, using the phase difference between the DMRS sequence and the PTRS sequence to transmit the signal or the phase difference indication of the PTRS sequence on the different symbols. The number of implicit indications and the like, the embodiment of the present application is not limited thereto.

It should be noted that, in the embodiment of the present application, when the precoding mode and the power adjustment mode are independently indicated, the precoding mode indicates a higher priority, that is, the power adjustment mode is effective only when the precoding mode is a nonlinear precoding mode. Otherwise invalid.

It should be understood that the foregoing description of the application in the present application describes a plurality of resource units in the full bandwidth, and may indicate, in an implicit manner, a precoding mode and/or a power adjustment mode when the network device sends data through the resource unit. Optionally, the implicit indication method may also be extended to full bandwidth, that is, after the network device determines the precoding mode and/or the power adjustment mode when transmitting data through the full bandwidth, the above implicit mode may be adopted. For the schemes of the precoding mode and/or the power adjustment mode, refer to the description above, and details are not described herein again.

The network device sends data to the first terminal device by using the first resource unit in a first precoding manner corresponding to the first terminal device.

Correspondingly, the terminal device receives data transmitted by the network device.

340. The terminal device processes the received data according to a corresponding precoding manner.

Specifically, the network device may indicate the precoding mode according to the scheme described above (which may be an implicit indication or an explicit indication), and the terminal device determines its corresponding precoding mode according to the indication of the network device, and according to the pre The encoding method demodulates the data. Optionally, in the non-linear precoding mode, the terminal device further needs to determine a power adjustment mode according to an indication of the network device (which may be an implicit indication or an explicit indication), and demodulate according to the determined precoding mode and power adjustment mode. data.

Specifically, the network device and the terminal device first need to determine the size of the resource unit, and then the network device needs to obtain multiple channel correlations corresponding to multiple terminal devices in each resource unit in each resource unit, and according to each resource unit. The plurality of channel correlation values determine a precoding manner corresponding to the terminal device that communicates on each resource unit, and determine a power adjustment mode based on a precoding method corresponding to the terminal device that communicates on each resource unit, and the network device needs to indicate each terminal. The precoding mode and power adjustment mode corresponding to each resource unit of the device on its scheduling bandwidth. The network device transmits data on each resource unit based on a precoding method and a power adjustment manner corresponding to the terminal device communicating on each resource unit. Correspondingly, each terminal device determines a precoding mode and a power adjustment mode corresponding to each resource unit in the scheduling bandwidth according to the indication of the network device, and according to the precoding mode and power corresponding to each resource unit in the scheduling bandwidth. The adjustment method demodulates the data.

Therefore, in the embodiment of the present application, the network device determines the precoding mode by using the resource unit as the granularity, which avoids the disadvantage that the terminal device determines a precoding mode on the full bandwidth in the prior art. Therefore, the embodiment of the present application determines the precoding mode corresponding to the terminal device in each resource unit by using the channel correlation of the terminal device on different resource units, thereby improving system performance.

It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application. The implementation process constitutes any limitation.

It should be understood that the above describes the use of the phase difference between the DMRS sequence and the PTRS sequence, or implicitly indicates the precoding mode and/or power adjustment mode corresponding to each terminal device by using the phase difference between the PTRS sequences on different symbols. However, the embodiment of the present application is not limited thereto, and in practical applications, the phase difference by the sequence can also be used to indicate other information. Specifically, if the indicated information is relatively small, for example, 1 bit or 2 bits, the other information may be indicated by the same method as before; if the indicated information is greater than 2 bits, multiple consecutive PTRS symbol phase differences may be used. Indicates different information, such as each group contains 2 or more adjacent RS-signed symbols, where RS can be DMRS and PTRS, or only PTRS, and the phase difference between PTRS sequences on each group of PTRS symbols can be represented. 1 to 2 bits of information.

It should be understood that the above examples of FIG. 1 to FIG. 4 are only for facilitating the understanding of the embodiments of the present application, and the embodiments of the present application are not limited to the specific numerical values or specific scenarios illustrated. A person skilled in the art will be able to make various modifications and changes in the embodiments according to the examples of FIG. 1 to FIG. 4, and such modifications or variations are also within the scope of the embodiments of the present application.

The communication device of the embodiment of the present application is described in detail below with reference to FIG. 1 to FIG.

FIG. 5 is a schematic structural diagram of a communications apparatus according to an embodiment of the present disclosure. The apparatus 500 may include:

Processing unit 510 and transceiver unit 520.

Specifically, the processing unit is configured to determine a plurality of channel correlation values of the plurality of terminal devices on the first resource unit, where the multiple terminal devices include devices that use the first resource unit to communicate, Each of the plurality of channel correlation values represents a degree of interference between two of the plurality of terminal devices;

And determining, according to the multiple channel correlation values, a precoding mode corresponding to each of the plurality of terminal devices, where the first terminal device corresponds to the first precoding mode, and the first terminal device is Describe any one of a plurality of terminal devices;

The transceiver unit is configured to send data to the first terminal device by using the first resource unit in a first precoding manner corresponding to the first terminal device.

In the embodiment of the present application, the communication device determines the precoding mode by using the resource unit as the granularity. The precoding mode corresponding to the same terminal device on different resource units may be different, and the terminal device in the prior art is determined to determine a full bandwidth. The shortcomings of the precoding method. Therefore, the embodiment of the present application determines the precoding mode corresponding to the terminal device in each resource unit by using the channel correlation of the terminal device on different resource units, thereby improving system performance.

Optionally, the processing unit is further configured to determine a size of the first resource unit;

The transceiver unit is further configured to send the first indication information to the first terminal device, where the first indication information is used to indicate a size of the first resource unit.

Optionally, the processing unit is specifically configured to:

Determining the size of the first resource unit according to the degree of fluctuation of channel correlation of the total bandwidth of each two terminal devices, or

Determining the size of the first resource unit according to a size of a scheduling bandwidth of the terminal device, or

Determining the size of the first resource unit according to a size of a subcarrier interval in a scheduling bandwidth of the terminal device, or

One of the preset values of the plurality of resource unit sizes is selected as the size of the first resource unit.

Optionally, the processing unit is specifically configured to: according to at least one of a degree of fluctuation of channel correlation between the terminal devices, a size of a scheduling bandwidth of the terminal device, and a size of a subcarrier interval in a scheduling bandwidth of the terminal device, One of the preset values of the plurality of resource unit sizes is selected as the size of the first resource unit.

Optionally, the processing unit is further configured to determine a size of the first resource unit according to a preset parameter, where the preset parameter includes a size of a scheduling bandwidth of the terminal device, and a subcarrier spacing in a scheduling bandwidth of the terminal device.

Optionally, the transceiver unit is further configured to send second indication information to the first terminal device, where the second indication information is used to indicate the first precoding mode.

Optionally, the second indication information is in the form of a bitmap, where the number of bits of the second indication information is equal to the number of resource units in the scheduling bandwidth of the first terminal device, where the second Each bit in the indication information is used to indicate a precoding manner corresponding to one resource unit.

Optionally, the transceiver unit is further configured to send, by using the first resource unit, a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence, where a phase difference between the DMRS sequence and the PTRS sequence is used to indicate the a precoding manner when the first terminal device communicates with the first resource unit, and/or a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.

Optionally, the transceiver unit is further configured to send a PTRS sequence by using multiple symbols in the first resource unit, where the multiple symbols include a first symbol set and a second symbol set, the first symbol set And a phase difference between the phase difference of the PTRS sequence and the PTRS sequence on the second symbol set is used to indicate a precoding manner when the first terminal device communicates using the first resource unit, and/or And a power adjustment manner when the network device sends data to the first terminal device by using the first resource unit.

Optionally, the precoding mode when the first terminal device communicates by using the first resource unit is a non-linear precoding mode, and the processing unit is further configured to determine, by using the first resource unit, the first The power adjustment mode when the terminal device sends data;

The transceiver unit is further configured to send third indication information to the first terminal device, where the third indication information is used to indicate that the network device sends data to the first terminal device by using the first resource unit. Power adjustment method.

Optionally, the third indication information is in the form of a bitmap, where the number of bits of the third indication information is equal to the number of resource units in the scheduling bandwidth of the first terminal device, where the third Each bit in the indication information is used to indicate a power adjustment mode corresponding to one resource unit.

Optionally, the transceiver unit is further configured to send fourth indication information to the first terminal device, where the fourth indication information is used to indicate a modulation and coding mode MCS corresponding to the first terminal device, where the The MCS is configured to indicate a power adjustment manner when the network device sends data to the first terminal device by using the first resource unit.

The communication device provided by the present application is a process performed by the network device in the foregoing method embodiment of FIG. 3, and the functions of each unit/module in the communication device can be referred to the description above, and details are not described herein again.

Therefore, in the embodiment of the present application, the precoding method corresponding to the terminal device in each resource unit is determined by the channel correlation of the terminal device on different resource units, and the precoding manner corresponding to the same terminal device on different resource units may be different. The shortcomings of the prior art terminal device determining a precoding mode over the entire bandwidth are avoided, and the system performance can be improved.

It should be understood that the communication device described in FIG. 5 may be a network device or a chip or an integrated circuit installed in the network device.

Taking a communication device as a network device as an example, FIG. 6 is a schematic structural diagram of a network device according to an embodiment of the present application, and may be, for example, a schematic structural diagram of a base station. As shown in FIG. 6, the network device 600 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiment.

The network device 600 may include one or more radio frequency units, such as a remote radio unit (RRU) 61 and one or more baseband units (BBUs) (also referred to as digital units, digital units, DUs). ) 62. The RRU 61 may be referred to as a transceiver unit 61, corresponding to the transceiver unit 520 of FIG. 5. Alternatively, the transceiver unit may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 611. And a radio frequency unit 612. The RRU 61 portion is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for transmitting precoding matrix information to a terminal device. The BBU 62 part is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 61 and the BBU 62 may be physically disposed together or physically separated, that is, distributed base stations.

The BBU 62 is a control center of the base station, and may also be referred to as a processing unit 62. It may correspond to the processing unit 510 in FIG. 5, and is mainly used to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) can be used to control the base station to perform an operation procedure about the network device in the foregoing method embodiment.

In an example, the BBU 62 may be composed of one or more boards, and multiple boards may jointly support a single access standard radio access network (such as an LTE network), or may separately support different access technologies. Access network (such as LTE network, 5G network or other network). The BBU 62 also includes a memory 621 and a processor 622. The memory 621 is used to store necessary instructions and data. The processor 622 is configured to control the base station to perform necessary actions, for example, to control the base station to perform an operation procedure of the network device in the foregoing method embodiment. The memory 621 and the processor 622 can serve one or more boards. That is, the memory and processor can be individually set on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.

It should be understood that the network device 600 shown in FIG. 6 can implement various processes related to the network device in the method embodiment of FIG. 3. The operations and/or functions of the various modules in the network device 600 are respectively implemented in order to implement the corresponding processes in the foregoing method embodiments. For details, refer to the description in the foregoing method embodiments. To avoid repetition, the detailed description is omitted here.

FIG. 7 is a schematic structural diagram of a communications apparatus according to an embodiment of the present disclosure. The apparatus 700 may include:

Processing unit 710 and transceiver unit 720.

Specifically, the transceiver unit is configured to receive data sent by the network device by using the first resource unit;

The processing unit is configured to demodulate the data by using a first precoding manner corresponding to the communication device, where the first precoding mode is that the network device is in a first resource unit according to multiple terminal devices. Determining, by the plurality of channel correlation values, the plurality of terminal devices including devices communicating using the first resource unit, each channel correlation value of the plurality of channel correlation values representing the plurality of terminals The degree of interference between two terminal devices in the device.

Optionally, the transceiver unit is further configured to receive first indication information that is sent by the network device, where the first indication information is used to indicate a size of the first resource unit.

Optionally, the processing unit is further configured to determine, according to a preset parameter, a size of the first resource unit, where the preset parameter includes a size of a scheduling bandwidth of the terminal device, and a scheduling bandwidth of the terminal device. Subcarrier spacing.

Optionally, the transceiver unit is further configured to receive second indication information that is sent by the network device, where the second indication information is used to indicate the first precoding mode.

Optionally, the second indication information is in the form of a bitmap, where the number of bits of the second indication information is equal to the number of resource units in the scheduling bandwidth of the communication device, where the second indication information Each bit in the bit is used to indicate the precoding mode corresponding to one resource unit.

Optionally, the transceiver unit is further configured to receive a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence sent by the network device by using the first resource unit, and the phase of the DMRS sequence and the PTRS sequence The difference is used to indicate a precoding manner when the communication device communicates using the first resource unit, and/or a power adjustment mode when the network device transmits data to the communication device by using the first resource unit.

Optionally, the transceiver unit is further configured to receive a PTRS sequence that is sent by the network device by using multiple symbols in the first resource unit, where the multiple symbols include a first symbol set and a second symbol set. a phase difference between the phase difference of the PTRS sequence on the first symbol set and the PTRS sequence on the second symbol set is used to indicate a precoding manner when the terminal device communicates using the first resource unit And/or a power adjustment manner when the network device sends data to the terminal device by using the first resource unit.

Optionally, the precoding mode when the communication device uses the first resource unit communication is a non-linear precoding mode, and the transceiver unit is further configured to receive third indication information sent by the network device, where the The three indication information is used to indicate a power adjustment manner when the network device sends data to the terminal device by using the first resource unit.

Optionally, the third indication information is in the form of a bitmap, where the number of bits of the third indication information is equal to the number of resource units in the scheduling bandwidth of the terminal device, where the third indication information is Each bit in the bit is used to indicate the power adjustment mode corresponding to one resource unit.

Optionally, the transceiver unit is further configured to receive fourth indication information that is sent by the network device, where the fourth indication information is used to indicate a modulation and coding mode MCS corresponding to the terminal device, where the MCS is used to And indicating a power adjustment manner when the network device sends data to the terminal device by using the first resource unit.

The communication device 700 provided by the present application corresponds to the process performed by the terminal device in the foregoing method embodiment of FIG. 3. The function of each unit/module in the communication device can be referred to the description above, and details are not described herein again.

In the embodiment of the present application, the precoding method corresponding to the terminal device in each resource unit is determined by the channel correlation of the terminal device on different resource units, and the precoding manner corresponding to the same terminal device on different resource units may be different, and the method may be avoided. In the prior art, the terminal device determines a precoding mode on the full bandwidth. Therefore, the terminal device in the embodiment of the present application uses the precoding method corresponding to the resource unit to demodulate data in different resource units, thereby improving system performance. .

It should be understood that the communication device described in FIG. 7 may be a terminal device or a chip or an integrated circuit installed in the terminal device.

Taking the communication device as a terminal device as an example, FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application, which is convenient for understanding and illustration. In FIG. 8, the terminal device uses a mobile phone as an example. Fig. 8 shows only the main components of the terminal device. The terminal device 800 shown in FIG. 8 includes a processor, a memory, a control circuit, an antenna, and an input/output device. The processor is mainly used for processing the communication protocol and the communication data, and controlling the entire terminal device, executing the software program, and processing the data of the software program, for example, for supporting the terminal device to perform the actions described in the foregoing method embodiments. Memory is primarily used to store software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The control circuit together with the antenna can also be called a transceiver, and is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are primarily used to receive user input data and output data to the user.

After the terminal device is powered on, the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program. When the data needs to be transmitted by wireless, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal, and then sends the radio frequency signal to the outside through the antenna in the form of electromagnetic waves. When data is transmitted to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.

Those skilled in the art will appreciate that FIG. 8 shows only one memory and processor for ease of illustration. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like.

As an optional implementation manner, the processor may include a baseband processor and a central processing unit, and the baseband processor is mainly used to process the communication protocol and the communication data, and the central processing unit is mainly used to control and execute the entire terminal device. A software program that processes data from a software program. The processor in FIG. 8 can integrate the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit can also be independent processors and interconnected by technologies such as a bus. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network standards, and the terminal device may include a plurality of central processors to enhance its processing capabilities, and various components of the terminal devices may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The functions of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.

In the embodiment of the present invention, the antenna and the control circuit having the transceiving function can be regarded as the transceiving unit 81 of the terminal device 800, for example, for supporting the terminal device to perform the transceiving function performed by the terminal device in the method implementation in FIG. The processor having the processing function is regarded as the processing unit 82 of the terminal device 800, which corresponds to the processing unit 710 in FIG. As shown in FIG. 8, the terminal device 800 includes a transceiving unit 81 and a processing unit 82. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, etc., and the transceiver unit corresponds to the transceiver unit 720 in FIG. Optionally, the device for implementing the receiving function in the transceiver unit 81 can be regarded as a receiving unit, and the device for implementing the sending function in the transceiver unit 81 is regarded as a sending unit, that is, the transceiver unit 81 includes a receiving unit and a sending unit. The receiving unit may also be referred to as a receiver, an input port, a receiving circuit, etc., and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit or the like.

The processing unit 82 can be configured to execute the instructions stored in the memory to control the transceiver unit 81 to receive signals and/or transmit signals to perform the functions of the terminal device in the foregoing method embodiments. As an implementation manner, the function of the transceiver unit 81 can be implemented by a dedicated chip through a transceiver circuit or a transceiver.

It should be understood that the terminal device 800 shown in FIG. 8 can implement various processes related to the terminal device in the method embodiment of FIG. 3. The operations and/or functions of the respective modules in the terminal device 800 are respectively implemented in order to implement the corresponding processes in the foregoing method embodiments. For details, refer to the description in the foregoing method embodiments. To avoid repetition, the detailed description is omitted here.

The embodiment of the present application further provides a processing apparatus, including a processor and an interface, and a processor, which is used to perform the communication in any of the foregoing method embodiments.

It should be understood that the above processing device may be a chip. For example, the processing device may be a Field-Programmable Gate Array (FPGA), may be an Application Specific Integrated Circuit (ASIC), or may be a System on Chip (SoC). It can be a Central Processor Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), or a Micro Controller (Micro Controller). Unit, MCU), can also be a Programmable Logic Device (PLD) or other integrated chip.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The above processor may be a general purpose processor, a digital signal processor (DSP), an application specific integrated crucit (ASIC), a field programmable gate array (FPGA) or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

It is to be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory. The volatile memory can be a random access memory (RAM) that acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM). SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronously connected dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the present application further provides a communication system, which includes the foregoing network device and terminal device.

The embodiment of the present application further provides a computer readable medium having stored thereon a computer program, the method of implementing the communication in any of the foregoing method embodiments when the computer program is executed by a computer.

The embodiment of the present application further provides a computer program product, which is implemented by a computer to implement the method of communication in any of the foregoing method embodiments.

In the above embodiments, it may be implemented in whole or in part 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 instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk, SSD)) and so on.

It should be understood that the method for communication in the downlink transmission in the communication system is described above, but the application is not limited thereto. Alternatively, the above similar scheme may also be adopted in the uplink transmission. Narration.

It is to be understood that the phrase "one embodiment" or "an embodiment" or "an embodiment" or "an embodiment" means that the particular features, structures, or characteristics relating to the embodiments are included in at least one embodiment of the present application. Thus, "in one embodiment" or "in an embodiment" or "an" In addition, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application. The implementation process constitutes any limitation.

The terms "component," "module," "system," and the like, as used in this specification, are used to mean a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside within a process and/or execution thread, and the components can be located on one computer and/or distributed between two or more computers. Moreover, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on signals having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.

It is also to be understood that the first, second, third, fourth, and various reference numerals are in the

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. achieve. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functionality for each particular application, but such implementation should not be considered to be beyond the scope of the application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

In the above embodiments, it may be implemented in whole or in part 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 (programs). When the computer program instructions (programs) are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)) or the like.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A method for data transmission, comprising:

The network device determines a plurality of channel correlation values of the plurality of terminal devices on the first resource unit, wherein the plurality of terminal devices comprise devices that communicate using the first resource unit, wherein the plurality of channel correlation values are Each channel correlation value represents a degree of interference between two of the plurality of terminal devices;

Determining, by the network device, a precoding mode corresponding to each of the plurality of terminal devices according to the multiple channel correlation values, where the first terminal device corresponds to the first precoding mode, and the first The terminal device is any one of the plurality of terminal devices;

The network device sends data to the first terminal device by using the first resource unit in a first precoding manner corresponding to the first terminal device.
The method of claim 1 further comprising:

Determining, by the network device, a size of the first resource unit;

The network device sends first indication information to the first terminal device, where the first indication information is used to indicate a size of the first resource unit.
The method according to claim 2, wherein the determining, by the network device, the size of the first resource unit comprises:

Determining, by the network device, a size of the first resource unit according to a degree of fluctuation of channel correlation of each two terminal devices over a full bandwidth, or

Determining, by the network device, a size of the first resource unit according to a size of a scheduling bandwidth of the multiple terminal devices, or

Determining, by the network device, a size of the first resource unit according to a size of a subcarrier spacing in a scheduling bandwidth of the multiple terminal devices, or

The network device selects one of the preset multiple resource unit size values as the size of the first resource unit.
The method according to any one of claims 1 to 3, further comprising:

The network device sends second indication information to the first terminal device, where the second indication information is used to indicate the first precoding mode.
The method according to any one of claims 1 to 3, further comprising:

Transmitting, by the network device, a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence by using the first resource unit, where a phase difference between the DMRS sequence and the PTRS sequence is used to indicate that the first terminal device uses the The precoding method when the first resource unit communicates; and/or,

a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.
The method according to any one of claims 1 to 3, further comprising:

Transmitting, by the network device, a PTRS sequence by using a plurality of symbols in the first resource unit, where the multiple symbols comprise a first symbol set and a second symbol set, where the PTRS sequence and the first symbol set are a phase difference of the PTRS sequence on the second set of symbols is used to indicate a precoding manner when the first terminal device communicates using the first resource unit; and/or,

a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.
The method according to any one of claims 1 to 3, further comprising:

Determining, by the network device, a power adjustment manner when the first resource unit sends data to the first terminal device;

The network device sends third indication information to the first terminal device, where the third indication information is used to indicate power adjustment when the network device sends data to the first terminal device by using the first resource unit. the way.
The method according to any one of claims 1 to 3, further comprising:

The network device sends fourth indication information to the first terminal device, where the fourth indication information is used to indicate a modulation and coding mode MCS corresponding to the first terminal device, where the MCS is used to indicate the network A power adjustment mode when the device sends data to the first terminal device by using the first resource unit.
A method for data transmission, comprising:

Receiving, by the terminal device, data sent by the network device by using the first resource unit;

The terminal device demodulates the data by using a first precoding manner corresponding to the terminal device, where the first precoding mode is that the network device is multiple according to multiple terminal devices on a first resource unit. Determining, by the channel correlation value, the plurality of terminal devices includes a device that communicates using the first resource unit, each of the plurality of channel correlation values representing a plurality of the terminal devices The degree of interference between two terminal devices.
The method of claim 9 wherein the method further comprises:

The terminal device receives the first indication information that is sent by the network device, where the first indication information is used to indicate a size of the first resource unit.
The method according to claim 9 or 10, wherein the method further comprises:

The terminal device receives the second indication information that is sent by the network device, where the second indication information is used to indicate the first precoding mode.
The method according to claim 9 or 10, wherein the method further comprises:

Receiving, by the terminal device, a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence sent by the network device by using the first resource unit, where a phase difference between the DMRS sequence and the PTRS sequence is used to indicate the terminal a precoding method when the device communicates using the first resource unit; and/or,

a power adjustment mode when the network device sends data to the terminal device by using the first resource unit.
The method according to claim 9 or 10, wherein the method further comprises:

Receiving, by the terminal device, a PTRS sequence that is sent by the network device by using multiple symbols in the first resource unit, where the multiple symbols include a first symbol set and a second symbol set, where the first symbol set is a phase difference between a phase difference of the PTRS sequence and the PTRS sequence on the second symbol set is used to indicate a precoding manner when the terminal device communicates using the first resource unit; and/or,

a power adjustment mode when the network device sends data to the terminal device by using the first resource unit.
The method according to claim 9 or 10, wherein the method further comprises:

The terminal device receives the third indication information that is sent by the network device, where the third indication information is used to indicate a power adjustment manner when the network device sends data to the terminal device by using the first resource unit.
The method according to claim 9 or 10, wherein the method further comprises:

The terminal device receives the fourth indication information that is sent by the network device, where the fourth indication information is used to indicate a modulation and coding mode MCS corresponding to the terminal device, where the MCS is used to indicate that the network device passes the A power adjustment mode when the first resource unit transmits data to the terminal device.
A communication device, comprising:

a processing unit, configured to determine a plurality of channel correlation values of the plurality of terminal devices on the first resource unit, where the multiple terminal devices include devices that use the first resource unit to communicate, the multiple channels are related Each of the channel correlation values represents a degree of interference between two of the plurality of terminal devices;

And determining, according to the multiple channel correlation values, a precoding mode corresponding to each of the plurality of terminal devices, where the first terminal device corresponds to the first precoding mode, and the first terminal device is Describe any one of a plurality of terminal devices;

The transceiver unit is configured to send data to the first terminal device by using the first resource unit in a first precoding manner corresponding to the first terminal device.
The communication device according to claim 16, wherein the processing unit is further configured to determine a size of the first resource unit;

The transceiver unit is further configured to send the first indication information to the first terminal device, where the first indication information is used to indicate a size of the first resource unit.
The communication device according to claim 17, wherein the processing unit is specifically configured to:

Determining the size of the first resource unit according to the degree of fluctuation of channel correlation of the total bandwidth of each two terminal devices, or

Determining a size of the first resource unit according to a size of a scheduling bandwidth of the multiple terminal devices, or

Determining a size of the first resource unit according to a size of a subcarrier spacing in a scheduling bandwidth of the multiple terminal devices, or

One of the preset values of the plurality of resource unit sizes is selected as the size of the first resource unit.
The communication device according to any one of claims 16 to 18, wherein the transceiver unit is further configured to send second indication information to the first terminal device, where the second indication information is used to indicate The first precoding method is described.
The communication device according to any one of claims 16 to 18, wherein the transceiver unit is further configured to send a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence by using the first resource unit, a phase difference between the DMRS sequence and the PTRS sequence is used to indicate a precoding manner when the first terminal device communicates using the first resource unit; and/or,

a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.
The communication device according to any one of claims 16 to 18, wherein the transceiver unit is further configured to send a PTRS sequence by using a plurality of symbols in the first resource unit, wherein the plurality of symbols comprise a first set of symbols and a second set of symbols, wherein a phase difference between the phase difference of the PTRS sequence on the first set of symbols and the PTRS sequence on the second set of symbols is used to indicate use by the first terminal device a precoding method when the first resource unit communicates; and/or,

a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.
The communication device according to any one of claims 16 to 18, wherein the processing unit is further configured to determine a power adjustment mode when the first resource unit transmits data to the first terminal device;

The transceiver unit is further configured to send third indication information to the first terminal device, where the third indication information is used to indicate that the network device sends data to the first terminal device by using the first resource unit. Power adjustment method.
The communication device according to any one of claims 16 to 18, wherein the transceiver unit is further configured to send fourth indication information to the first terminal device, where the fourth indication information is used to indicate The modulation and coding mode MCS corresponding to the first terminal device, where the MCS is used to indicate a power adjustment mode when the network device sends data to the first terminal device by using the first resource unit.
A communication device, comprising:

a transceiver unit, configured to receive data sent by the network device by using the first resource unit;

a processing unit, configured to demodulate the data by using a first precoding manner corresponding to the communication device, where the first precoding manner is that the network device is configured according to a plurality of terminal devices on a first resource unit. Determined by the channel correlation values, the plurality of terminal devices including devices that communicate using the first resource unit, each of the plurality of channel correlation values representing the plurality of terminal devices The degree of interference between the two terminal devices.
The communication device according to claim 24, wherein the transceiver unit is further configured to receive first indication information sent by the network device, where the first indication information is used to indicate a size of the first resource unit .
The communication device according to claim 24 or 25, wherein the transceiver unit is further configured to receive second indication information sent by the network device, where the second indication information is used to indicate the first precoding the way.
The communication device according to claim 24 or 25, wherein the transceiver unit is further configured to receive a demodulation reference signal DMRS sequence and a phase tracking reference signal PTRS sequence sent by the network device by using the first resource unit. And a phase difference between the DMRS sequence and the PTRS sequence is used to indicate a precoding manner when the communication device communicates using the first resource unit; and/or,

a power adjustment mode when the network device sends data to the communication device by using the first resource unit.
The communication device according to claim 24 or 25, wherein the transceiver unit is further configured to receive a PTRS sequence sent by the network device by using a plurality of symbols in the first resource unit, where the multiple The symbol includes a first symbol set and a second symbol set, a phase difference between the phase difference of the PTRS sequence and the PTRS sequence on the second symbol set on the first symbol set is used to indicate use by the terminal device a precoding method when the first resource unit communicates; and/or,

a power adjustment mode when the network device sends data to the terminal device by using the first resource unit.
The communication device according to claim 24 or 25, wherein the transceiver unit is further configured to receive third indication information that is sent by the network device, where the third indication information is used to indicate that the network device passes the A power adjustment mode when the first resource unit transmits data to the terminal device.
The communication device according to claim 24 or 25, wherein the transceiver unit is further configured to receive fourth indication information that is sent by the network device, where the fourth indication information is used to indicate that the terminal device corresponds to The modulation coding mode MCS, wherein the MCS is used to indicate a power adjustment mode when the network device sends data to the terminal device by using the first resource unit.
A computer readable storage medium, comprising a computer program, when the computer program is run on a computer, causing the computer to perform the method of any one of claims 1 to 15.
A system comprising the communication device according to any one of claims 16 to 23 and the communication device according to any one of claims 24 to 30.