CN110365380B

CN110365380B - Data transmission method, communication device and system

Info

Publication number: CN110365380B
Application number: CN201810315139.3A
Authority: CN
Inventors: 徐明慧; 张希; 陈磊
Original assignee: Chengdu Huawei Technology Co Ltd
Current assignee: Chengdu Huawei Technology Co Ltd
Priority date: 2018-04-10
Filing date: 2018-04-10
Publication date: 2021-12-14
Anticipated expiration: 2038-04-10
Also published as: CN110365380A; WO2019196801A1

Abstract

The application provides a data transmission method, a communication device and a system, wherein the method comprises the steps that a network device determines a plurality of channel correlation values of a plurality of terminal devices on a first resource unit, wherein the plurality of terminal devices comprise devices which use the first resource unit for communication, and each channel correlation value in the plurality of channel correlation values represents the interference degree between two terminal devices in the plurality of terminal devices; the network device determines a precoding mode corresponding to each terminal device in the plurality of terminal devices according to the plurality of channel correlation values, wherein a first terminal device corresponds to a first precoding mode, and the first terminal device is any one of the plurality of terminal devices; and the network equipment transmits data to the first terminal equipment through the first resource unit by using a first precoding mode corresponding to the first terminal equipment. The embodiment of the application can improve the system performance.

Description

Data transmission method, communication device and system

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

In an existing Long Term Evolution (LTE) system, Multiple Input Multiple Output (MIMO) is a key technology of a physical layer, and is a method for improving system performance by using multiple transmitting antennas and multiple receiving antennas.

Before precoding, the system firstly maps data information to be transmitted to different layers through layer mapping so that the data information is distributed to different layers according to a certain mode, and then maps the data information distributed to the layers to a physical antenna through the precoding technology. The pre-coding technology can transfer some necessary signal processing processes which are difficult to implement at the receiving end to the transmitting end, thereby ensuring the signal performance of the transmission process.

The existing precoding technology is actually an adaptive technology, and a result of precoding data information changes correspondingly with a change of Channel State Information (CSI), and the data information preprocessing technology that changes in real time according to the change of CSI enables a terminal device to obtain correct target data information in the changing CSI, so precoding is a very critical technology in MIMO of a Long Term Evolution (LTE) system.

The performance and complexity of different precoding modes are different from each other, typical precoding modes can be divided into two types, namely linear precoding and nonlinear precoding, and each type of precoding mode has a suitable working scene.

In the existing LTE protocol, a precoding scheme of a terminal device at a full bandwidth is determined according to a channel correlation of the terminal device at the full bandwidth, and in LTE, because a system bandwidth is small, a change of the channel correlation between the terminal devices at the full bandwidth is small, and the precoding scheme between the terminal devices can be accurately determined by using the channel correlation at the full bandwidth. However, in the fifth generation New Radio (NR) technology, the system bandwidth may be as high as 400M, and the maximum bandwidths supported by the terminal devices may be greatly different, and at this time, the channel correlation between the terminal devices is difficult to keep consistent on the system bandwidth, so that at this time, the channel correlation of the full bandwidth is still used to determine the precoding mode of the terminal device, which may cause inaccurate precoding mode selection and affect the system performance.

Disclosure of Invention

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

In a first aspect, a method of data transmission is provided, the method including a network device determining a plurality of channel correlation values for a plurality of terminal devices on a first resource unit, wherein the plurality of terminal devices includes devices communicating using the first resource unit, each of the plurality of channel correlation values representing a degree of interference between two of the plurality of terminal devices; the network device determines a precoding mode corresponding to each terminal device in the plurality of terminal devices according to the plurality of channel correlation values, wherein a first terminal device corresponds to a first precoding mode, and the first terminal device is any one of the plurality of terminal devices; and the network equipment transmits data to the first terminal equipment through the first resource unit by using a first precoding mode corresponding to the first terminal equipment.

In the embodiment of the application, the network device determines the precoding mode according to the channel correlation value of the terminal device in the resource unit by taking the resource unit as the granularity, and the corresponding precoding modes of the same terminal device in different resource units may be different, so that the defect that the terminal device determines a precoding mode in the full bandwidth in the prior art is overcome. Therefore, according to the embodiment of the application, the precoding modes corresponding to the terminal equipment on each resource unit are determined through the channel correlation of the terminal equipment on different resource units, and the system performance can be improved.

It is to be understood that the plurality of terminal devices comprises devices communicating using the first resource unit, each of the plurality of channel correlation values representing a degree of interference between two of the plurality of terminal devices.

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

And (4) respectively. For example, when n is 3, that is, the plurality of terminal devices are 3 terminal devices (1 st terminal device to 3 rd terminal device), thatThe plurality of confidence values may include

(i.e. 3) channel correlation values, namely a channel correlation value corresponding to the 1 st terminal device and the 2 nd terminal device, a correlation value corresponding to the 1 st terminal device and the 3 rd terminal device, and a channel correlation value corresponding to the 2 nd terminal device and the 3 rd terminal device.

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 granularity, and a larger value of the channel correlation indicates a larger degree of interference between the two terminal devices, whereas a smaller value of the channel correlation indicates a smaller degree of interference between the two terminal devices.

With reference to the first aspect, in an implementation manner of the first aspect, a size of the first resource unit is preset, that is, the size of the first resource unit is default by the system. 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 determine the precoding mode directly according to the default first resource unit size by using the method of the embodiment of the present application. Accordingly, the terminal device may demodulate the received data directly according to the default first resource unit size by using the method of the embodiment of the present application.

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 application, and the network device does not need to send a signaling to the terminal device to indicate the size of the resource unit, so that the embodiment of the application can save resources and reduce signaling overhead.

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

the network device determining a size of the first resource unit;

the network device sends first indication information to the first terminal device, wherein the first indication information is used for indicating 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 instruct the terminal device of the size of the resource unit.

It should be understood that, in this embodiment of the present application, the first indication information may be a higher layer signaling, such as Radio Resource Control (RRC) signaling, a Medium Access Control (MAC) layer signaling, a Downlink Control Information (DCI), broadcast information, or the like, and the embodiment of the present application is not limited thereto.

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 fluctuation degree of the channel correlation of every two terminal devices in the full bandwidth.

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

Since the size of the resource unit is directly related to the performance of the non-linear precoding, the size of the resource unit is determined by the most intuitive method according to the fluctuation degree of the channel correlation of the terminal equipment on the full bandwidth, so that the size of the appropriate resource unit can be flexibly determined according to the channel state.

Or, 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 size of the scheduling bandwidth of the plurality of 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 number of RBs included therein, and the smaller the scheduling bandwidth of the terminal device, the smaller the absolute bandwidth (in MHz) occupied by the resource unit or the number of RBs included therein.

the network device determines the size of the first resource unit according to the size of the subcarrier spacing in the scheduling bandwidths of the plurality of terminal devices,

for example, the larger the subcarrier spacing in the scheduling bandwidth of the terminal device is, the smaller the number of RBs included in the resource unit is; the smaller the subcarrier spacing is, the greater the number of RBs included in a resource unit is; or the larger the subcarrier interval in the scheduling bandwidth of the terminal device is, the larger the absolute bandwidth (in MHz) occupied by the resource unit is, the smaller the subcarrier interval of the terminal device is, and the smaller the absolute bandwidth (in MHz) occupied by the resource unit is. Optionally, the network device may also determine a resource unit size corresponding to the current subcarrier according to a one-to-one correspondence relationship between preset intervals of multiple subcarriers and multiple resource unit sizes.

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

the network device selects one value from a plurality of preset resource unit size values as the size of the first resource unit.

According to the embodiment of the application, the set of the resource unit size is specified, and the size of the resource unit is directly selected from the set, so that the complexity of implementation can be reduced, and the signaling overhead can be reduced.

With reference to the first aspect, in an implementation manner of the first aspect, the selecting, by the network device, one of values from preset values of sizes of multiple resource units as the size of the first resource unit includes:

and the network equipment selects one value from a plurality of preset resource unit size values as the size of the first resource unit according to at least one of the fluctuation degree of the channel correlation among the terminal equipment, the size of the scheduling bandwidths of the plurality of terminal equipment and the size of the subcarrier interval in the scheduling bandwidths of the plurality of terminal equipment.

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 change in the state of the channel.

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

It should be noted that after the current data is finished, when the size of the resource unit is not changed in the subsequent transmission of the downlink data, the network device may not send the first indication information, and the terminal device may determine the size of the resource unit corresponding to the current data transmission according to the indication of the network device in the last data transmission.

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

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

For example, the period unit for updating the size of the resource unit may be a mini slot (mini slot), and may be a slot, for example, the period is N slots, where the value of N may be a positive integer, and if N is 1, the value indicates that the size of the resource unit is updated once per slot.

For another example, N ═ 1,2,4,8, or 16 (corresponding to subcarrier intervals of 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz, respectively) indicates the size of one resource unit update per subframe.

For another example, N ═ 10, 20, 40, 80, or 160 (corresponding to subcarrier intervals of 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz, respectively) indicates the size of one resource unit per system frame update; the period unit may also be a subframe, for example, M subframes, where M ═ 1 indicates the size of the resource unit updated once per subframe, and M ═ 10 indicates the size of the resource unit updated once per frame; the period unit may also be an absolute time, such as 5ms,10ms,20ms,40ms,80ms,100ms,200ms,400ms,800ms,1600ms, …, etc., and the embodiments of the present application are not limited thereto.

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

Alternatively, the size of the resource unit may be updated non-periodically in the embodiments of the present application.

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

Therefore, in the embodiment of the application, the size of the resource unit is flexibly updated by updating the channel state information through the network device or the terminal device, and under the condition of large channel state change, the size of the resource unit corresponding to the current channel state can be determined in time, so that the precoding mode can be determined according to the updated size of the resource unit, and the system performance can be improved.

the network device determines the size of the first resource unit according to preset parameters, wherein the preset parameters include the size of a scheduling bandwidth of the terminal device and the subcarrier spacing in the 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 manner or rule is used by both the transmitting and receiving ends to determine the same size of the resource unit. Therefore, the network device does not need to transmit the indication information of the size of the additional resource unit to the terminal device.

In the embodiment of the application, the network device and the terminal device determine the size of the resource unit according to the same rule, so that the network device does not need to additionally indicate the size of the resource unit of the terminal device through signaling, the implementation complexity can be reduced, and the signaling overhead can be reduced.

and the network equipment sends second indication information to the first terminal equipment, wherein the second indication information is used for indicating 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, a bit number of the second indication information is equal to a number of resource units in a scheduling bandwidth of the first terminal device, where each bit in the second indication information is used to indicate a precoding scheme corresponding to one resource unit.

For example, in the embodiment of the present application, the precoding manner of each resource unit may be explicitly indicated in the form of a bitmap (bitmap), where if the number of resource units is 4, the bitmap has 4 bits in total, and for example, 0110 indicates that the precoding manner in the four resource units is { linear precoding, nonlinear precoding, linear precoding }, or { nonlinear precoding, linear precoding, nonlinear precoding }.

According to the embodiment of the application, the precoding mode is indicated in an explicit mode, so that the terminal equipment can directly determine the precoding mode corresponding to each resource unit according to the second indication information, an additional calculation process is not needed, and the implementation complexity can be reduced.

the network device sends a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence through the first resource unit, wherein a phase difference between the DMRS sequence and the PTRS sequence is used for indicating a precoding mode when the first terminal device uses the first resource unit for communication, and/or a power adjustment mode when the network device sends data to the first terminal device through the first resource unit.

the network device sends a PTRS sequence through a plurality of symbols in the first resource unit, wherein the plurality of symbols comprise a first symbol set and a second symbol set, and a phase difference of the PTRS sequence on the first symbol set and a phase difference of the PTRS sequence on the second symbol set are used for indicating a precoding mode when the first terminal device uses the first resource unit for communication; and/or a power adjustment mode when the network device transmits data to the first terminal device through the first resource unit.

According to the embodiment of the application, the precoding mode and/or the power adjustment mode are/is implicitly indicated by referring to the phase difference of the signal sequence, so that the network equipment does not need to additionally indicate the precoding mode and/or the power adjustment mode through signaling, and the signaling overhead can be saved.

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

the network equipment determines a power adjustment mode when data is transmitted to the first terminal equipment through the first resource unit;

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 through 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, a bit number of the third indication information is equal to a number of resource units in a 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.

For example, in the embodiment of the present application, the power adjustment manner of each resource unit may be indicated in a form of a bitmap (bitmap), where if the number of resource units is 4 and four resource units are present, the bitmap has 4 bits in total, and if four resource units are all non-linear precoding, 0110 respectively indicates that the precoding manner in the four resource units is { modulo, power backoff, modulo }, or { power backoff, modulo, power backoff }; and if the precoding mode of the terminal equipment on some resource units is linear precoding, the power adjustment mode indicated by the bitmap is invalid.

According to the embodiment of the application, the power adjustment mode is indicated in an explicit mode, so that the terminal device can directly determine the power adjustment mode corresponding to each resource unit according to the second indication information, an additional calculation process is not needed, and the implementation complexity can be reduced.

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 Scheme (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 through the first resource unit.

The embodiment of the application implicitly indicates the power adjustment mode through the MCS, so that the network equipment does not need to additionally indicate the power adjustment mode through signaling, and the signaling overhead can be saved.

In a second aspect, a method for data transmission is provided, the method comprising: the terminal equipment receives data sent by the network equipment through 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 manner is determined by the network device according to a plurality of channel correlation values of a plurality of terminal devices in a first resource unit, the plurality of terminal devices include devices communicating by using the first resource unit, and each of the plurality of channel correlation values represents an interference degree between two terminal devices in the plurality of terminal devices.

In the embodiment of the application, the network device determines the precoding mode by taking the resource unit as the granularity, and the corresponding precoding modes of the same terminal device on different resource units may be different, so that the defect that the terminal device determines a precoding mode on the full bandwidth in the prior art is overcome. Therefore, the terminal device in the embodiment of the application demodulates data in different resource units by using the precoding mode corresponding to the resource unit, and can improve the system performance.

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

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

the terminal device receives first indication information sent by the network device, wherein the first indication information is used for indicating the size of the first resource unit.

the terminal device determines the size of the first resource unit according to preset parameters, where the preset parameters include the size of a scheduling bandwidth of the terminal device and a subcarrier interval in the scheduling bandwidth of the terminal device.

and the terminal equipment receives second indication information sent by the network equipment, wherein the second indication information is used for indicating 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, a bit number of the second indication information is equal to a number of resource units in a scheduling bandwidth of the terminal device, where each bit in the second indication information is used to indicate a precoding manner corresponding to one resource unit.

the terminal device receives a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence which are transmitted by the network device through the first resource unit, wherein a phase difference between the DMRS sequence and the PTRS sequence is used for indicating a precoding mode when the terminal device uses the first resource unit for communication, and/or a 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 sent by the network device through a plurality of symbols in the first resource unit, wherein the plurality of symbols comprise a first symbol set and a second symbol set, a phase difference of the PTRS sequence on the first symbol set and a phase difference of the PTRS sequence on the second symbol set are used for indicating a precoding mode when the terminal device uses the first resource unit for communication, and/or a power adjustment mode when the network device sends data to the terminal device through the first resource unit.

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

the terminal device receives third indication information 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 through the first resource unit.

With reference to the second aspect, in one implementation manner of the second aspect,

the third indication information is in the form of a bitmap, 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, wherein each bit of the third indication information is used for indicating a power adjustment mode corresponding to one resource unit.

the terminal device receives fourth indication information sent by the network device, where the fourth indication information is used to indicate a Modulation and Coding Scheme (MCS) corresponding to the terminal device, where the MCS is used to indicate a power adjustment mode when the network device sends data to the terminal device through the first resource unit.

In a third aspect, a communication device is provided, which includes various means or units for performing the method of the first aspect or any one of the possible implementations of the first aspect.

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

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

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

In a fifth aspect, a communications apparatus is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the network device performs the method of the first aspect and possible implementations thereof.

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

In a sixth aspect, a communications apparatus is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the terminal device performs the method of the second aspect and possible implementations thereof.

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

In a seventh aspect, a computer-readable medium is provided, on which a computer program is stored, which, when being executed by a computer, carries out the method of the first aspect or any of its possible implementations.

In 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 the second aspect or any of its possible implementations.

In a ninth aspect, there is provided a computer program product which, when executed by a computer, implements the method of the first aspect or any of its possible implementations.

A tenth aspect provides a computer program product which, when executed by a computer, implements the method of the second aspect or any possible implementation of the second aspect.

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

the processor is configured to perform the methods as an execution subject of the methods in any possible implementation manner of the first aspect, the second aspect, the first aspect, or the second aspect, where relevant data interaction processes (e.g. making or receiving data transmission) are completed through the interface. In a specific implementation process, the interface may further complete the data interaction process through a transceiver.

It should be understood that the processing device in the above-mentioned eleventh aspect may be a chip, the processor may be implemented by hardware or may be implemented by software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a twelfth aspect, a system is provided, which includes the foregoing network device and terminal device.

Drawings

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

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

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

Fig. 4 is a diagram of a constellation diagram according to one embodiment of the present application.

Fig. 5 is a schematic diagram of a communication device according to one 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 one 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 solution in the present application will be described below with reference to the accompanying drawings.

Embodiments of the present application are applicable to various communication systems, and thus, the following description is not limited to a specific communication system. For example, the embodiments of the present application may be applied to a Long Term Evolution (LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD) system, a Wireless Local Area Network (WLAN), a wireless fidelity (WiFi), and a next generation communication system, i.e., a fifth generation (5G) communication system, e.g., a New Radio (NR) system.

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

In some deployments, the gNB may include a Centralized Unit (CU) and a Distributed Unit (DU). The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB, and the DU implements part of the function of the gNB, for example, the CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) layers, and the DU implements Radio Link Control (RLC), Medium Access Control (MAC) and Physical (PHY) layers. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling or PHCP layer signaling, may also be considered to be transmitted by the DU or by the DU + RU under this architecture. It is to be understood that the network device may 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, or may be divided into network devices in the core network CN, which is not limited herein.

In the embodiments of the present application, a 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 remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. 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), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a household appliance, a wearable device, a drone device, and a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

By way of example, and not limitation, in embodiments of the present invention, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and the like.

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

antennas

104 and 106, another antenna group can include

antennas

106 and 110, and an additional group can include

antennas

112 and 114. 2 antennas are shown in fig. 1 for each antenna group, however, more or fewer antennas may be utilized for each group. Network device 102 can additionally include a transmitter chain and a receiver chain, each of which can comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.

Network device 102 may communicate with a plurality of terminal devices, such as terminal device 116 and terminal device 122. However, it is understood that network device 102 may communicate with any number of terminal devices similar to

terminal devices

116 or 122.

End devices

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

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

antennas

112 and 114, where

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, where

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.

In a Frequency Division Duplex (FDD) system, forward link 116 may utilize a different frequency band than that used by reverse link 120, and forward link 124 may utilize a different frequency band than that used by reverse link 126, for example.

As another example, in Time Division Duplex (TDD) systems and full duplex (full duplex) systems, forward link 116 and reverse link 120 may use a common frequency band and forward link 124 and reverse link 126 may use a common frequency band.

Each group of antennas and/or area designed for communication is referred to as a sector of network device 102. For example, antenna groups may be designed to communicate to terminal devices in a sector of the areas covered by network device 102. During communication by network device 102 with

terminal devices

116 and 122 over

forward links

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

forward links

116 and 124. Moreover, mobile devices in neighboring cells can experience less interference when network device 102 utilizes beamforming to transmit to

terminal devices

116 and 122 scattered randomly through an associated coverage area, as compared to a manner in which a network device transmits through a single antenna to all its terminal devices.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting apparatus and/or a wireless communication receiving apparatus. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmitting device may obtain (e.g., generate, receive from other communication devices, or save in memory, etc.) a number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be contained in a transport block (or transport blocks) of data, which may be segmented to produce multiple code blocks.

Furthermore, the communication system 100 may be a public land mobile network PLMN (public land mobile network) network or device-to-device (D2D) network or machine-to-machine (M2M) network or other networks, which is illustrated in fig. 1 for ease of understanding only and is a simplified schematic diagram, and other network devices may be included in the network, which are not shown in fig. 1.

Fig. 2 shows the main steps of a data processing procedure performed by a transmitting end (e.g., a network device) before data is transmitted through an Orthogonal Frequency Division Multiplexing (OFDM) symbol. As shown in fig. 2, a traffic stream from an upper layer (e.g., a Medium Access Control (MAC) layer) is subjected to channel coding, and then the obtained codeword is subjected to scrambling, modulation, layer mapping, and then mapped to one or more layers, and then subjected to precoding processing, resource unit mapping, and finally the modulated symbol is transmitted through an antenna port.

Accordingly, the receiving end (e.g., terminal device) can demodulate the data. The specific data processing procedures can be referred to the description in the existing standard.

The main function of the MIMO technology is to provide spatial diversity and spatial multiplexing gain, MIMO utilizes multiple transmitting antennas to transmit signals with the same information through different paths, and can obtain multiple independently fading signals of the same data symbol at a receiving end, thereby obtaining improved receiving reliability of diversity, and spatial diversity of the MIMO technology can be used to combat channel fading.

The precoding technology not only can effectively inhibit the interference of a plurality of users in the MIMO system, but also can greatly simplify the algorithm of a receiving end and simultaneously obviously improve the system capacity. The precoding uses the known channel state information CSI to preprocess the transmitted signal at the transmitting terminal, so that the processed transmitted signal can adapt to the channel environment, thereby eliminating the interference between users, and achieving the purposes of reducing the system error rate, improving the system capacity, reducing the transmitting power and the like.

The performance and complexity of different precoding modes are different from each other, typical precoding modes can be divided into two types, namely linear precoding and nonlinear precoding, and each type of precoding mode has a suitable working scene. Linear precoding and nonlinear precoding are separately described below.

Linear precoding is the linear processing of the acquired channel state information. Typical linear precoding algorithms may include Zero Forcing (ZF) precoding and its various improved algorithms, Minimum Mean Square Error (MMSE) precoding, Block Diagonalization (BD) precoding, and optimized signal to leakage noise ratio (SLNR) precoding. The linear precoding has the advantages of low operation complexity, simple implementation and strong practicability, but is greatly influenced by channel correlation, because when a channel matrix H is ill-conditioned, equivalent noise of a receiving end is increased, so that demodulation and detection are influenced, and system performance loss is brought.

Nonlinear precoding is to perform nonlinear operation on a channel matrix (such as introducing iteration, interference cancellation, modulus extraction, and power back-off), and typical nonlinear precoding manners may include Dirty Paper Coding (DPC), modular algebraic precoding (THP), and Vector Perturbation (VP) precoding. The nonlinear precoding has the advantages of excellent performance, less influence of channel correlation and high complexity.

Because the performance and complexity of the linear precoding mode and the nonlinear precoding mode are different, the network device needs to balance factors such as complexity and performance according to different channel conditions, and determine that the precoding mode for data processing is a linear precoding mode or a nonlinear precoding mode.

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

In view of the foregoing problems, an embodiment of the present application provides a method for determining a precoding scheme. Specifically, the network device determines a precoding manner corresponding to each terminal device in the resource unit according to the channel correlation value of the terminal device in the resource unit. In the embodiment of the application, the network device determines the precoding mode by taking the resource unit as the granularity, and the corresponding precoding modes of the same terminal device on different resource units may be different, so that the defect that the terminal device determines a precoding mode on the full bandwidth in the prior art is overcome. Therefore, according to the embodiment of the application, the precoding modes corresponding to the terminal equipment on each resource unit are determined through the channel correlation of the terminal equipment on different resource units, and the system performance can be improved.

It should be understood that, in the embodiment of the present application, the precoding manner corresponding to the terminal device indicates a precoding manner adopted when the network device sends data to the terminal device through the first resource unit.

It should be understood that the term "precoding manner" herein may also be referred to as a precoding scheme, a precoding mode, a precoding category or a precoding type, and the like, and the application is not limited thereto in the implementation.

The term "power adjustment manner" may also be referred to as a power adjustment scheme, a power adjustment mode, a power adjustment category or a power adjustment type, and the like, and the present application is not limited thereto.

It should be understood that "full bandwidth" in the embodiment of the present application may refer to a system bandwidth or a total bandwidth that can be scheduled by the system, and the embodiment of the present application is not limited thereto.

For convenience of understanding and explanation, the following description will be given by way of example, and not limitation, to describe the execution process and actions of the communication method of the present application in a communication system.

Fig. 3 is a schematic flow diagram of a method of communication according to one embodiment of the invention. The method shown in fig. 3 describes the method of the embodiment of the present application from the perspective of the interaction of the network device with the terminal device. Specifically, the method shown in fig. 3 includes:

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

Wherein the plurality of terminal devices comprise devices that communicate using the first resource unit, each of the plurality of channel correlation values representing a degree of interference between two of the plurality of terminal devices.

And (4) respectively. For example, when n is 3, i.e. the plurality of terminal devices are 3 terminal devices (1 st terminal device to 3 rd terminal device), the plurality of correlation values may include

It should be understood that the value of the channel correlation represents the degree of interference between two terminal devices communicating using the first resource unit, and a larger value of the channel correlation represents a larger degree of interference between the two terminal devices, whereas a smaller value of the channel correlation represents a smaller degree of interference between the two terminal devices.

By way of example and not limitation, the following describes an explanation of channel correlations corresponding to a plurality of terminal devices communicating using a first resource unit in the embodiments of the present application:

assuming that the number of receiving antennas of each terminal device is 1, the channel between the network device and the kth terminal device is denoted Hk and has a dimension of 1 × Nt, where Nt is the number of transmitting antennas of the network device. Singular Value Decomposition (SVD) is performed on the channel Hk to obtain a main right singular vector of the kth terminal device, that is, a right singular vector corresponding to the maximum eigenvalue, where the right singular vector represents a transmission direction of data of the kth terminal device in space.

The channel correlation between two terminal devices then means: the smaller the module value or the projection length of the main right singular vector of one of the two terminal devices on the main right singular vector of the other terminal device is, the lower the channel correlation is, otherwise, the higher the channel correlation is.

Because the lengths of the right singular vectors are the same and are all 1, the factor influencing the size of the inner product is the included angle between the data transmission directions of the terminal devices, and the closer the included angle is to 0 degree or 180 degrees, the larger the modulus value of the inner product is, the larger the channel correlation is; the closer the angle is to 90 ° or 270 °, the smaller the modulus of the inner product, and the smaller the channel correlation.

In this embodiment, a resource unit may represent a segment of bandwidth resource, for example, one resource unit is a segment of bandwidth resource in the system bandwidth, for example, one resource unit is a number of Resource Blocks (RBs), or a number of Resource Block Groups (RBGs), or a segment of absolute bandwidth resource (MHz), for example, 5 megabases, 10 megabases, and the like, which is not limited in this embodiment. In other words, a plurality of resource units may be included in the system bandwidth. For example, in a 400M system bandwidth, a resource unit may be divided into a 10M bandwidth, a 20M bandwidth, a 50M bandwidth, and the like. That is, the network device needs to perform the same processing as the first resource unit for each 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, herein, a resource unit may also be referred to as a subband, a resource granularity, or a resource set, etc., and the embodiments of the present application are not limited thereto.

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

The first method is as follows:

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

The second method comprises the following steps:

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 instruct the terminal device of the size of the resource unit.

Accordingly, as another embodiment, the method further comprises:

the network device determining a size of the first resource unit;

Accordingly, the terminal device receives the first indication information.

By way of example and not limitation, a specific possible implementation manner in which the network device determines the size of the first resource unit in the second mode is described as follows:

in one possible implementation, the network device determines the size of the first resource unit according to the fluctuation degree of the channel correlation of every two terminal devices over the full bandwidth.

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

Triggered by the network device: the network device compares the channel estimated by the Sounding Reference Signal (SRS), the Channel State Information (CSI) fed back by the terminal device, the Channel Quality Indicator (CQI), the precoding vector indicator (PMI), the Rank Indicator (RI), the interference information, etc.) with the previous channel state information according to the acquired channel state information of each terminal device (the channel state information may include at least one of the following, and when the difference exceeds a certain threshold, the size of the resource unit and the precoding manner are determined again.

Triggered by the terminal: the terminal device obtains current channel state information (the channel state information may include at least one of a channel estimated by a demodulation reference signal (DMRS) and/or a channel state information reference signal (CSI-RS) and/or a Phase Tracking Reference Signal (PTRS) and/or other Reference Signals (RS)) of the terminal device, compares the current channel state information with previous channel state information, and sends a request for updating the size of the resource unit and the precoding scheme and/or a suggested resource unit size (the message content may be an absolute value of the resource unit size or an index or number of the resource unit size) to the network device when the difference exceeds a certain threshold. The network device may choose to update or not update the resource unit size upon receiving the request and/or the suggested value.

Therefore, according to the embodiment of the application, the size of the resource unit is flexibly updated according to the channel state information through the network device or the terminal device, and under the condition that the channel state changes greatly, the size of the resource unit corresponding to the current channel state can be determined in time, so that the precoding mode can be determined according to the updated size of the resource unit, and the system performance can be improved.

The foregoing describes a manner of determining the size of the resource unit, alternatively, in another possible implementation, the network device determines the size of the first resource unit according to the sizes of the scheduling bandwidths of the plurality of terminal devices,

specifically, the network device may determine the size of the resource unit according to the scheduling bandwidths of the plurality of terminal devices. The larger the scheduling bandwidth of the terminal device is, the larger the absolute bandwidth (unit is MHz) occupied by the resource unit or the number of contained RBs is, and the smaller the scheduling bandwidth of the terminal device is, the smaller the absolute bandwidth (unit is MHz) occupied by the resource unit or the number of contained RBs is.

It should be understood that, in practical applications, the scheduling bandwidths in the multiple terminal devices may not be completely the same, and the network device may determine the sizes of multiple different resource units according to the scheduling bandwidths of different terminal devices, in this case, the network device may determine a value as the final size of the resource unit according to the sizes of the multiple different resource units. For example, the minimum value, the maximum value, the median value, or the average value among the plurality of values is 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 size of the resource unit may be directly determined by the scheduling bandwidth, that is, both the network device and the terminal device may determine the size of the resource unit according to the scheduling bandwidth, and no additional signaling is required to indicate the size of the resource unit.

It should be appreciated that once the size of a 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 the size of the first resource unit according to the size of the subcarrier spacing in the scheduling bandwidths of the plurality of terminal devices. It should be appreciated that typically the subcarrier spacing in the scheduling bandwidth of the plurality of terminal devices are all 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 size of a resource unit according to a subcarrier interval in the scheduling bandwidth of the terminal device, for example, the larger the subcarrier interval in the scheduling bandwidth of the terminal device is, the smaller the number of RBs included in the resource unit is; the smaller the subcarrier spacing is, the greater the number of RBs included in a resource unit is; or the larger the subcarrier interval in the scheduling bandwidth of the terminal device is, the larger the absolute bandwidth (in MHz) occupied by the resource unit is, the smaller the subcarrier interval of the terminal device is, and the smaller the absolute bandwidth (in MHz) occupied by the resource unit is. Optionally, the network device may also determine a resource unit size corresponding to the current subcarrier according to a one-to-one correspondence relationship between preset intervals of multiple subcarriers and multiple resource unit sizes. It should be understood that, at this time, the subcarrier intervals of the devices of the multiple terminals in the resource unit are the same, and the size of the resource unit may be directly determined by the subcarrier intervals, that is, at this time, both the network device and the terminal device may determine the size of the resource unit according to the subcarrier intervals, and no additional signaling is required to indicate the size of the resource unit.

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

For example, the set of Resource unit sizes includes Resource unit sizes of n Resource Block Groups (RBGs), where a value of n may be a positive integer or a positive integer satisfying a power of 2; or, the set of Resource unit sizes includes Resource unit sizes of n Resource Blocks (RBs), where n may be an integer or a positive integer satisfying a power of 2; or the resource unit size of the set of resource unit sizes is 1/n BW_sysWherein BW_sysIs the system bandwidth in units of megas (M), e.g., BW_sysN is a positive integer satisfying the power of 2, e.g., n is 1,2,4,8, …, i.e., the size of the resource unit may be 400M, 200M, 100M, 50M, ….

Optionally, as another embodiment, the selecting, by the network device, one of the values from the preset values of the sizes of the plurality of resource units as the size of the first resource unit includes:

and the network equipment selects one value from a plurality of preset resource unit size values as the size of the first resource unit according to at least one of the fluctuation degree of the channel correlation among the terminal equipment, the size of the scheduling bandwidth of the terminal equipment and the size of the subcarrier interval in the scheduling bandwidth of the terminal equipment.

It should be noted that, when the network device selects one of the multiple resource unit size values (i.e. the set of resource unit sizes) as the resource unit size, the network device may also select the state of the reference current channel, for example, according to the channel correlation between the terminal devices, select a closest value in the set or take the logarithm of the closest value, and then select the logarithm of the closest valueThe near value is used as the resource unit size. For example, the resource unit size in the set is denoted as { SubBW }_iThat is, 1,2, …, the size of the resource unit determined according to the channel correlation between the terminal devices is x, and the size of the closest resource unit can be (x/sub bw) satisfied_i) The maximum i in ≦ 1, which may also be satisfied as (x/SubBW)_i) The minimum i in not less than 1 can also be (x/SubBW)_i) I nearest 1, e.g. abs ((x/SubBW)_i) -1) the smallest i, to which the embodiments of the present application are not limited. The following examples are given for illustrative purposes: if the set of resource unit sizes is {400M, 200M, 100M, 50M }, when the resource unit size determined according to the channel correlation between the terminal devices is smaller than 50M, one of the alternatives is to select 50M as the resource unit size; when the resource unit size determined according to the channel correlation between the terminal devices is larger than 75M and smaller than 150M, one of the alternatives is to select 100M as the resource unit size.

Similarly, in this embodiment of the present application, a relationship between the subcarrier spacing and/or the scheduling bandwidth size and the resource unit size in the set may also be pre-established or configured, and then the network device determines one of the subcarrier spacing and/or the scheduling bandwidth size of the current data from the set of the resource unit size as the resource unit size.

The third method comprises the following steps:

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 manner or rule is used by both the transmitting and receiving ends to determine the same size of the resource unit. Therefore, the network device does not need to transmit the indication information of the size of the additional resource unit to the terminal device.

Accordingly, as another embodiment, the method further comprises:

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

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

For example, after the transceiving end has determined or defined the relationship between the subcarrier spacing and/or the scheduling bandwidth size and the resource unit size in the set, the resource unit size for determining the precoding scheme when currently transmitting data may be implicitly indicated by the subcarrier spacing and/or the scheduling bandwidth, for example: if the resource unit size in the set is {25 RBs, 50 RBs, 100 RBs }, the resource unit size corresponds to subcarrier spacing {120k, 60k, 30k }; if the resource unit size is {16 RBs, 32 RBs, 64 RBs, 128 RBs }, the subcarrier spacing is {240k, 120k, 60k, 30k }, respectively. In this case, the network device and the terminal device may determine the size of the resource unit corresponding to the subcarrier based on the correspondence between the subcarrier spacing and the size of the resource unit.

And 320, the network device determines a precoding mode corresponding to each terminal device in the plurality of terminal devices according to the plurality of channel correlation values.

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

As an example and not by way of limitation, the following describes a scheme for a network device to determine a precoding manner corresponding to each terminal device:

assuming that 5 terminal devices use the first resource unit for communication and the number of data layers of each terminal device is a single layer, the network device transmits 5 layers of data in total.

The network device may determine the precoding mode corresponding to each terminal device through the following steps:

step 1: the network device respectively obtains channels of 5 terminal devices, namely channel 1, channel 2, … and channel 5

Step 2: the network equipment respectively calculates the channel correlation value between every two terminal equipments to obtain a correlation matrix R with the dimension of N × N, namely 5 × 5, wherein R_pqRepresents the channel correlation of the p-th terminal device and the q-th terminal device, and therefore, the diagonal element of R is 1 and is symmetrical about the diagonal, namely R_pq＝R_qp。

Assuming that a resource unit comprises a plurality of RBGs, a method for determining a correlation matrix is to determine the correlation of UE on the jth RBG in the ith TTI, and then average the correlation on the RBGs to obtain a correlation matrix R on the resource unit⁽ⁱ⁾Where i denotes an index of TTI and j denotes an index of RBG in one resource unit

Wherein

Can be expressed as [ v₁,v₂,...v₅]Wherein v is_kRepresenting the right singular vector of the jth RBG of the kth terminal equipment in the ith TTI, and the dimensionality is N_t*1，N_tRepresenting the number of transmit antennas of the network device,

representation pair matrix

Each element in the complex number is obtained, for example, the module value of a + j × b is sqrt (a ^2+ b ^ 2).

It should be understood that, if the precoding mode is reconfigured at periodic intervals by multiple time slots in the embodiment of the present application, the correlation matrix obtained by each time slot is obtained

There may also be an alpha filtering operation, in whichAlpha is a filtering factor, and the value of alpha can be configured by the network equipment and also can be a preset value.

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

and step 3: and selecting the terminal equipment of the first layer.

That is, the network device needs to select terminal devices of respective layers according to the correlation matrix.

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

Mode A: and calculating the average correlation between each terminal device and other terminal devices, and selecting the terminal device with the minimum correlation as the first-layer terminal device.

For example, the average channel correlation values of 5 terminal devices are: 0.386,0.640,0.456,0.664,0.522.

The average correlation of the first terminal device is the smallest, 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 correlation of the UE itself with itself, that is, the diagonal elements, and the average correlation of the terminal device is sum (r)/5, where sum (r) represents the summation for each row or each column of the matrix. Optionally, as another scheme, averaging diagonal elements may not be included when calculating the average correlation of the terminal device, that is, calculating the average correlation of the terminal device to be (sum (r) -1)/4.

Mode B: the threshold for the predefined or default or configured correlation is λ_RComparing it with R_ijThe ratio lambda in the channel correlation of each terminal device and other terminal devices is counted_RSmall (or less than or equal to lambda)_R) The number of correlations in (a) is,selecting the terminal equipment with the largest number as the first layer terminal equipment

Such as assuming λ_R0.5, the channel correlation with the other terminal devices among the five terminal devices is smaller than (or equal to or smaller than) λ_RThe number of the elements in each column of R is respectively (namely, the number of the elements in each column of R is less than lambda in the other elements except the diagonal elements_RNumber of elements): 4,2,3,2,3, so that the first terminal device is a first tier terminal device

Note that: if there are multiple terminal equipments, the channel correlation value is less than or equal to lambda_RIf the number of the terminal devices is the same, the terminal device with the smallest correlation is selected from the plurality of terminal devices, or the terminal device with the smallest average correlation is the first-layer terminal device.

Mode C: the terminal device with the smallest number in the plurality of terminal devices scheduled by the network device is the first layer terminal device, i.e. terminal device 1.

Since each terminal device corresponds to an identifier or label, for example, the labels from terminal device 1 to terminal device 5 are respectively 1 to 5, the network device may select the terminal device with the smallest label, that is, terminal device 1, as the first-tier terminal device.

And 4, step 4: and selecting the terminal equipment of other layers.

The network device may rank the scheduling terminal devices according to the channel correlation, and schedule the terminal devices ranked as i on the ith layer, and determine the precoding mode of each terminal device according to the channel correlation. Specifically, the network device sequentially confirms the terminal devices of the 2 nd layer and the 3 rd layer. For example, based on the sorted i-1 layer terminal devices, sequentially calculating the average correlation between the remaining terminal devices and the current sorted top i-1 layer terminal device, selecting the terminal device with the smallest average correlation as the terminal device of the i-th layer, and comparing the average channel correlation value of the terminal device of the i-th layer corresponding to the current sorted top i-1 layer terminal device with the correlation threshold λ of the predefined or configured linear precoding_NonTHPIf the average channel correlation value is less than or equal to (or less than) λ_NonTHPIf not, the precoding mode corresponding to the i-th layer terminal equipment is a linear precoding mode, otherwise, the precoding mode is a nonlinear precoding mode.

In the following by_NonTHPSpecific examples of the network device determining the second to fifth layers are described as 0.4 as an example.

Determining the terminal equipment of the second layer: the correlations between the remaining terminal devices (terminal device 2 to terminal device 5) and the first tier terminal device are [0.15,0.14,0.40,0.24], respectively, wherein the terminal device having the smallest correlation with the terminal device 1 is the terminal device 3, and thus the terminal device 3 is the second tier terminal device.

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

By analogy with …, the final determined terminal device order and the average channel correlation used when determining the order are: [ terminal device 1(0.386), terminal device 3(0.14), terminal device 5(0.145), terminal device 2(0.4733), terminal device 4(0.58)]Wherein the average correlation of terminal device 2 and terminal device 4 is greater than λ_NonTHPTherefore, the precoding method corresponding to terminal device 2 and terminal device 4 is nonlinear precoding. The average correlation of the terminal device 3 and the terminal device 5 is less than λ_NonTHPTherefore, the precoding method corresponding to terminal device 3 and terminal device 4 is linear precoding. The terminal device 1 is located in the first layer and is not interfered by other terminal devices, so the precoding mode adopted by the terminal device 1 can be selected from linear and nonlinear precoding modes according to the actual situation, when the remaining other terminal devices are nonlinear precoding or the first terminal device arranged behind the terminal device is nonlinear precoding, the terminal device 1 can select nonlinear precoding, and when the first terminal device arranged behind the terminal device is linear precoding, the terminal device 1 selects linear precoding.

It should be understood that the above determining the precoding manner according to the channel correlation is only an example, and in an actual situation, the precoding manner corresponding to the terminal device may also 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, and the like; or determining a precoding mode corresponding to the terminal device by using other scheduling algorithms, and the like, which is not limited in the embodiments of the present application.

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 this embodiment of the present application, the network device may explicitly indicate the precoding manner, or may implicitly indicate the precoding manner.

First, a scheme for explicitly indicating a precoding scheme in an embodiment of the present application is described below.

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

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

According to the embodiment of the application, the precoding mode is indicated in an explicit mode, so that the terminal equipment can directly determine the precoding mode corresponding to each resource unit according to the second indication information, an additional calculation process is not needed, and the implementation complexity can be reduced. .

The following introduces a scheme of implicitly indicating a precoding scheme in the embodiment of the present application.

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

the network device transmits a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence through the first resource unit to indicate a precoding mode, and a phase difference between the DMRS sequence and the PTRS sequence (which may also be referred to as a phase difference between transmission signals of the DMRS sequence and the PTRS sequence) is used for indicating the precoding mode when the first terminal device communicates by using the first resource unit.

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

In consideration of the above-mentioned reception phase error, in the embodiment of the present application, the precoding scheme of the resource unit may be determined by the phase difference of the transmission signal between the DMRS sequence and the PTRS sequence, for example:

when the value range of the receiving phase error of the two sequences is (-pi/2, pi/2), the corresponding relation between the precoding mode and the phase difference of the transmitting signals of the two sequences is as follows:

linear precoding: the PTRS sequence and the DMRS sequence are completely the same, and the phase difference is 0 degrees.

Nonlinear precoding: the PTRS sequence and DMRS sequence are opposite, with a phase difference of 180 °.

When the value range of the receiving phase error of the two sequences is (-pi/3, pi/3), the phase difference of the transmission signals of the two sequences can indicate the precoding mode and the power adjustment mode at the same time, and the corresponding relationship between the precoding mode and the sequence phase difference (phase difference of the transmission signals) is as follows:

linear precoding: PTRS sequence and DMRS sequence are identical, i.e. phase difference is 0 °

Nonlinear precoding, and modulo adjustment of power: the PTRS sequence and the DMRS sequence have a phase difference of 2/3 pi.

Nonlinear precoding, and power backoff adjustment power: the PTRS sequence and the DMRS sequence have a phase difference of-2/3 pi.

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

In the foregoing, a scheme of implicitly indicating a precoding manner through a phase difference between a PTRS sequence and a DMRS sequence transmitted signal is introduced, alternatively, the implicit indication method may be further extended to a phase difference between PTRS sequences on two or more PTRS symbols. Accordingly, as an embodiment, the method further comprises:

the network device sends a PTRS sequence through a plurality of symbols in the first resource unit, wherein the plurality of symbols comprise a first symbol set and a second symbol set, and a phase difference of the PTRS sequence on the first symbol set and a sending signal phase difference of the PTRS sequence on the second symbol set are used for indicating a precoding mode when the first terminal device uses the first resource unit for communication.

For example, the sequence phases of PTRS are identical over all symbols representing linear precoding; the phase difference between the PTRS sequence on the odd symbol and the PTRS sequence on the even symbol is 180 degrees, which indicates nonlinear precoding, or the phase difference is 2/3 pi, which indicates nonlinear precoding, and the power is modulo adjusted; the phase difference between the PTRS sequence phase on the odd symbol and the PTRS sequence phase on the even symbol is-2/3 pi, so that the nonlinear precoding is indicated, and the power is adjusted by power backoff; the odd numbers and the even numbers can be replaced by the first n numbers and the last m numbers, namely, the PTRS sequences on the first n PTRS symbols and the PTRS phases on the last m PTRS symbols represent different information.

According to the embodiment of the application, the precoding mode is indicated in an implicit mode, so that the network equipment does not need to additionally indicate the precoding mode through signaling, and signaling overhead can be saved.

Note that, in the case of using the non-linear coding, the power increased by subtracting the interference is adjusted. The network device needs to adjust the power at which data is transmitted. Specifically, the network device may employ the following two power adjustment approaches.

The first power adjustment method is as follows: and (5) a mode finding mode. I.e. the signal after interference cancellation is mapped back to the original constellation diagram where the current modulation mode is located. The signal after modulo can be expressed as:

X’＝mod(x,T)＝x+n*T+m*j*T，

wherein x is a signal after interference elimination; t is the size of the original constellation diagram and is related to the modulation order, and when the modulation order is 2,4 and 6, the modulation order is respectively 4/sqrt (2),8/sqrt (10) and 16/sqrt (42);

x' is a signal after modulus calculation;

n, m are unique integer values such that the real and imaginary parts of X' are both within the set [ -sqrt (T)/2, sqrt (T)/2 ];

as shown in fig. 4, the abscissa represents the in-phase component, the ordinate represents the quadrature component, taking 16QAM as an example, the range of the original constellation is identified by a black solid frame, the expanded constellation is represented by a dashed frame, if the constellation point of the original signal is a, after interference cancellation, the original signal becomes a signal B, and the modulo operation is to fold B back to the corresponding point within the range of the original constellation, i.e. C shown in the diagram, where the relative position of B in the expanded constellation is the same as the relative position of C in the original constellation.

The second power adjustment method is as follows: a power back-off mode. Assuming that each terminal device is a single stream, the signal with cancelled interference power of the kth terminal device is:

wherein, a_kRepresenting the original signal of the k-th terminal device, λ_kWhich is indicative of a power back-off factor,

represents the front face k-1Total interference of individual terminal equipments to the kth terminal equipment.

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

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

The following first introduces a scheme for explicitly indicating a power adjustment manner in the embodiment of the present application.

Accordingly, as another embodiment, the precoding method when the first terminal device uses the first resource unit for communication is a non-linear precoding method, and the method further includes:

Optionally, as another embodiment, the third indication information is in the form of a bitmap, a bit number of the third indication information is equal to a 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.

According to the embodiment of the application, the power adjustment mode is explicitly indicated, so that the terminal device can directly determine the power adjustment mode corresponding to each resource unit according to the second indication information, an additional calculation process is not needed, and the implementation complexity can be reduced.

The following describes an embodiment of the present application and a scheme for implicitly indicating a power adjustment mode.

Accordingly, as another embodiment, the method further comprises:

the network device transmits a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence through the first resource unit, and a phase difference between the DMRS sequence and the PTRS sequence (which may also be referred to as a phase difference between transmission signals of the DMRS sequence and the PTRS sequence) is used to indicate a power adjustment manner when the network device transmits data to the first terminal device through the first resource unit.

Specifically, the method is the same as an implicit indication method of a precoding method, that is, the power adjustment method is determined by a phase difference between signals transmitted by a DMRS sequence and a PTRS sequence.

It should be noted that, due to the influence of phase noise and the like, reception phase errors occur in the received signals of the DMRS sequence and PTRS sequence themselves. The reception phase error represents a difference between a phase difference between the reception signals of the DMRS sequence and the PTRS sequence and a phase difference between the transmission signals. For example, when the phase difference of the transmission signals is 0, the reception phase error is equal to the phase difference between the reception signals of the DMRS sequence and the PTRS sequence.

For example, when the receiving phase error (error range due to phase noise) of the DMRS sequence and the PTRS sequence has a value range of (-pi/2, pi/2), the correspondence between the phase difference (phase difference between transmission signals) of the DMRS sequence and the PTRS sequence and the power adjustment is as follows:

modulus adjustment power: the PTRS sequence and the DMRS sequence are completely the same, and the phase difference is 0 degrees.

Power back-off adjustment power: the PTRS sequence and DMRS sequence are opposite, with a phase difference of 180 °.

It should be noted that, when the value ranges of the receiving phase errors of the two sequences are included in (-pi/3, pi/3), the phase difference of the transmission signals of the two sequences can indicate the precoding method and the power adjustment method at the same time, and the correspondence relationship between the power adjustment method and the sequence phase difference is as follows:

Nonlinear precoding, and modulo adjustment of power: the PTRS sequence and the DMRS sequence are 2/3 pi (pi) out of phase.

The scheme of implicit power adjustment through the phase difference between the PTRS sequence and the DMRS sequence is introduced in the foregoing, alternatively, the implicit indication method may be further extended to the phase difference between the PTRS sequences on two or more PTRS symbols. Accordingly, as an embodiment, the method further comprises:

the network device sends a PTRS sequence through a plurality of symbols in the first resource unit, where the plurality of symbols includes a first symbol set and a second symbol set, and a phase difference between the PTRS sequence on the first symbol set and a phase difference between the PTRS sequence on the second symbol set are used to indicate a power adjustment manner when the network device sends data to the first terminal device through the first resource unit.

For example, the sequence phase of PTRS is identical over all symbols representing the modulo adjustment power; or the like, or, alternatively,

the phase difference between the PTRS sequence on the odd symbols and the PTRS sequence on the even symbols is 180 degrees, and the power back-off adjustment power is represented; or the like, or, alternatively,

the phase difference is 2/3 pi, the nonlinear precoding is indicated, and the power is modulo adjusted; or the like, or, alternatively,

the phase difference between the PTRS sequence phase on the odd symbol and the PTRS sequence phase on the even symbol is-2/3 pi, so that the nonlinear precoding is indicated, and the power is adjusted by power backoff; the odd numbers and the even numbers can be replaced by the first n numbers and the last m numbers, namely, the PTRS sequences on the first n PTRS symbols and the PTRS phases on the last m PTRS symbols represent different information.

The foregoing describes a scheme for indicating the manner of fixed power adjustment by the phase difference between the PTRS sequence and the DMRS sequence, or the phase difference between the PTRS sequences on two or more PTRS symbols. In the embodiment of the present application, the power loss introduced by the modulo is different in different modulation modes, specifically, the higher the modulation mode is, the lower the power loss introduced by the modulo is. Therefore, alternatively, the power adjustment mode may be selected according to the modulation mode of the terminal device in the embodiments of the present application.

Accordingly, as another embodiment, the method further comprises:

For example, the MCS and power adjustment method are associated as follows:

a high-order modulation mode: and performing modulo calculation, for example, performing modulo calculation when the modulation mode is 16QAM or more than 16QAM, or the modulation order is greater than or equal to m, where m may be 4,6, ….

A low-order modulation mode: and power back-off, for example, when the modulation mode is QPSK or below, or the modulation order is less than m, where m may have a value of 4,6, ….

The embodiment of the application indicates the power adjustment mode in an implicit mode, so that the network equipment does not need to additionally indicate the power adjustment mode through signaling, and signaling overhead can be saved.

It should be understood that the above examples indicating the precoding manner and the power adjustment manner are only for helping those skilled in the art understand the embodiments of the present invention, and are not intended to limit the embodiments of the present invention to the specific values or the specific scenarios illustrated. It will be apparent to those skilled in the art from the examples given that various equivalent modifications or variations are possible, and such modifications or variations are also within the scope of the embodiments of the invention.

It should be noted that, in some implementation manners, in this embodiment of the present application, a network device needs to indicate two kinds of information, that is, a precoding manner and a power adjustment manner (which may be an implicit indication or an explicit indication) to a terminal device, and the various indication methods described above may be used in any combination, for example, as an example and without limitation, this embodiment of the present application may use any one of the following combined schemes to indicate a precoding manner and a power adjustment manner:

the explicit method informs the precoding mode, the implicit method informs the power adjustment mode, wherein the implicit method can arbitrarily select any one or more combinations of the above listed implicit indication schemes.

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

The implicit method notifies a precoding manner, and the implicit method notifies a power adjustment manner, where the two specific indication methods may be combined, for example, a scenario when a value range of a phase difference of a corresponding sequence transmission signal is included in (-pi/3, pi/3), or different methods may be separately used, for example, a precoding manner uses a phase difference between a DMRS sequence and a PTRS sequence transmission signal or a phase difference indication of a PTRS sequence transmission signal on different symbols, a power adjustment manner uses a modulation order implicit indication, and the like, and the embodiments of the present application are not limited thereto.

It should be noted that, in the embodiment of the present application, when the precoding manner and the power adjustment manner are independently indicated, the priority indicated by the precoding manner is higher, that is, the power adjustment manner is only valid when the precoding manner is the nonlinear precoding manner, and is otherwise invalid.

It should be understood that, in the foregoing embodiment of the present application, it is described that a plurality of resource units are included in a full bandwidth, and a precoding manner and/or a power adjustment manner when a network device sends data through the resource units may be implicitly indicated. Optionally, the method for implicitly indicating may also be extended to the full bandwidth, that is, after the network device determines the precoding manner and/or the power adjustment manner when transmitting data through the full bandwidth, the scheme for implicitly indicating the precoding manner and/or the power adjustment manner may be adopted, which may specifically refer to the description above and is not described here again.

330, the network device sends data to the first terminal device through the first resource unit by using the first precoding method corresponding to the first terminal device.

Correspondingly, the terminal equipment receives the data sent by the network equipment.

340, the terminal device processes the received data according to the corresponding pre-coding mode.

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

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

Therefore, in the embodiment of the present application, the network device determines the precoding manner by using the resource unit as the granularity, and the disadvantage that the terminal device determines a precoding manner in the full bandwidth in the prior art is avoided. Therefore, according to the embodiment of the application, the precoding modes corresponding to the terminal equipment on each resource unit are determined through the channel correlation of the terminal equipment on different resource units, and the system performance can be improved.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should be understood that, in the above description, the precoding manner and/or the power adjustment manner corresponding to each terminal device are implicitly indicated by using the phase difference between the DMRS sequence and the PTRS sequence, or by using the phase difference between the PTRS sequences on different symbols. However, the embodiments of the present application are not limited thereto, and in practical applications, the phase difference of the sequence may also be used to indicate other information. Specifically, if the indicated information is less, for example, 1 bit or 2 bits, the other information may be indicated by the same method as described above; if the indicated information is greater than 2 bits, different information can be represented by using multiple groups of continuous PTRS symbol phase differences, for example, each group includes 2 or more than 2 adjacent symbols with RSs, where the RSs may be a DMRS and a PTRS, or may be only a PTRS, and the phase differences between PTRS sequences on each group of PTRS symbols can represent 1-2 bits of information.

It should be understood that the above examples of fig. 1 to 4 are only for assisting the skilled person in understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention to the specific values or specific scenarios illustrated. It will be apparent to those skilled in the art that various equivalent modifications or variations are possible in light of the examples given in figures 1 to 4, and such modifications or variations are also within the scope of the embodiments of the invention.

The method for data transmission according to the embodiment of the present invention is described in detail above with reference to fig. 1 to 4, and the communication apparatus according to the embodiment of the present invention is described below with reference to fig. 5 to 8.

Fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the device 500 may include:

a processing unit 510 and a transceiving unit 520.

Specifically, the processing unit is configured to determine a plurality of channel correlation values of a plurality of terminal devices in a first resource unit, where 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 terminal devices of the plurality of terminal devices;

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

the transceiver unit is configured to send data to the first terminal device through the first resource unit by using a first precoding scheme corresponding to the first terminal device.

In the embodiment of the application, the communication device determines the precoding mode by taking the resource unit as the granularity, and the corresponding precoding modes of the same terminal device on different resource units may be different, so that the defect that the terminal device determines a precoding mode on the full bandwidth in the prior art is overcome. Therefore, according to the embodiment of the application, the precoding modes corresponding to the terminal equipment on each resource unit are determined through the channel correlation of the terminal equipment on different resource units, and the system performance can be improved.

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

the transceiver unit is further configured to send 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 fluctuation degree of the channel correlation of every two terminal devices on the full bandwidth, or

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

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

And selecting one value from a plurality of preset resource unit size values as the size of the first resource unit.

Optionally, the processing unit is specifically configured to select one of the preset multiple resource unit size values as the size of the first resource unit according to at least one of a fluctuation degree of the inter-terminal device channel correlation, a size of a scheduling bandwidth of the terminal device, and a size of a subcarrier interval in the scheduling bandwidth of the terminal device.

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

Optionally, the transceiver 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 manner.

Optionally, the second indication information is in the form of a bitmap, 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 each bit in the second indication information is used to indicate a precoding scheme corresponding to one resource unit.

Optionally, the transceiver unit is further configured to transmit a DMRS sequence and a PTRS sequence for a demodulation reference signal through the first resource unit, where 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 manner when the network device transmits data to the first terminal device through the first resource unit.

Optionally, the transceiver unit is further configured to transmit a PTRS sequence through a plurality of symbols in the first resource unit, where the plurality of symbols includes a first symbol set and a second symbol set, and a phase difference between the PTRS sequence in the first symbol set and a phase difference between the PTRS sequence in the second symbol set are used to indicate a precoding manner when the first terminal device communicates using the first resource unit, and/or a power adjustment manner when the network device transmits data to the first terminal device through the first resource unit.

Optionally, the precoding manner when the first terminal device uses the first resource unit for communication is a non-linear precoding manner, and the processing unit is further configured to determine a power adjustment manner when data is transmitted to the first terminal device through the first resource unit;

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 a power adjustment mode when the network device sends data to the first terminal device through the first resource unit.

Optionally, the third indication information is in the form of a bitmap, a bit number of the third indication information is equal to a 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.

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 scheme MCS corresponding to the first terminal device, where the MCS is used to indicate a power adjustment manner when the network device sends data to the first terminal device through the first resource unit.

The communication apparatus provided in this application is a process executed by the network device in the embodiment of the method in fig. 3, and the functions of each unit/module in the communication apparatus may refer to the description above, which is not described again here

Therefore, in the embodiment of the application, the precoding modes corresponding to the terminal equipment in each resource unit are determined through the channel correlation of the terminal equipment in different resource units, and the precoding modes corresponding to the same terminal equipment in different resource units may be different, so that the defect that the terminal equipment determines one precoding mode in the full bandwidth in the prior art is overcome, and the system performance can be improved.

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

Taking a communication device as an example of a network device, fig. 6 is a schematic structural diagram of a network device provided in an embodiment of the present application, which 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, and performs the functions of the network device in the above-described 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, DUs) 62. The RRU61 may be referred to as a transceiver unit 61, corresponding to the transceiver unit 520 in fig. 5, and may also be referred to as a transceiver, transceiver circuit, or transceiver, which may include at least one antenna 611 and a radio frequency unit 612. The RRU61 section is mainly used for transceiving and converting radio frequency signals and baseband signals, for example, for sending precoding matrix information to a terminal device. The BBU62 part is mainly used for baseband processing, base station control, and the like. The RRU61 and the BBU62 may be physically located together or physically located separately, i.e., distributed base stations.

The BBU62 is a control center of the base station, and may also be referred to as a processing unit 62, and may correspond to the processing unit 510 in fig. 5, and is mainly used for performing 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 execute the operation flow related to the network device in the above method embodiment.

In an example, the BBU62 may be formed by one or more boards, where a plurality of boards may support a radio access network of a single access system (e.g., an LTE network) together, or may support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks) respectively. The BBU62 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 the operation procedures of the above method embodiments with respect to the network device. The memory 621 and the processor 622 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be appreciated that the network device 600 shown in fig. 6 is capable of implementing various processes involving the network device in the method embodiment of fig. 3. The operations and/or functions of the modules in the network device 600 are respectively for implementing the corresponding flows in the above-described method embodiments. Specifically, reference may be made to the description of the above method embodiments, and the detailed description is appropriately omitted herein to avoid redundancy.

Fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application, where the device 700 may include:

a processing unit 710 and a transceiving unit 720.

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

the processing unit is configured to demodulate the data using a first precoding manner corresponding to the communication apparatus, where the first precoding manner is determined by the network device according to a plurality of channel correlation values of a plurality of terminal devices in a first resource unit, the plurality of terminal devices include devices communicating using the first resource unit, and each of the plurality of channel correlation values represents a degree of interference between two terminal devices of the plurality of terminal devices.

Optionally, 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.

Optionally, the processing unit is further configured to determine the size of the first resource unit according to preset parameters, where the preset parameters include the size of the scheduling bandwidth of the terminal device and subcarrier intervals in the scheduling bandwidth of the terminal device.

Optionally, 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 manner.

Optionally, the second indication information is in the form of a bitmap, and a bit number of the second indication information is equal to a number of resource units in a scheduling bandwidth of the communication apparatus, where each bit in the second indication information is used to indicate a precoding scheme corresponding to one resource unit.

Optionally, the transceiver unit is further configured to receive a DMRS sequence and a PTRS sequence, which are demodulation reference signals, transmitted by the network device through 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 apparatus communicates using the first resource unit, and/or a power adjustment manner when the network device transmits data to the communication apparatus through the first resource unit.

Optionally, the transceiver unit is further configured to receive a PTRS sequence transmitted by the network device through a plurality of symbols in the first resource unit, where the plurality of symbols includes a first symbol set and a second symbol set, and a phase difference of the PTRS sequence on the first symbol set and a phase difference of the PTRS sequence on the second symbol set are used to indicate a precoding manner when the terminal device uses the first resource unit for communication, and/or a power adjustment manner when the network device transmits data to the terminal device through the first resource unit.

Optionally, the precoding manner when the communication device uses the first resource unit for communication is a non-linear precoding manner, and the transceiver unit is further configured to receive third indication information 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 through the first resource unit.

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

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

The communication apparatus 700 provided in this application corresponds to the process executed by the terminal device in the foregoing embodiment of the method in fig. 3, and the functions of each unit/module in the communication apparatus may refer to the description above, which is not described again here

According to the embodiment of the application, the precoding modes corresponding to the terminal equipment on the resource units are determined through the channel correlation of the terminal equipment on different resource units, the precoding modes corresponding to the same terminal equipment on different resource units are possibly different, and the defect that the terminal equipment determines one precoding mode on the full bandwidth in the prior art is overcome.

It should be understood that the communication device described in fig. 7 may be a terminal device, and may also be a chip or an integrated circuit mounted in the terminal device.

Taking a communication device as an example of a terminal device, fig. 8 is a schematic structural diagram of the terminal device provided in the embodiment of the present application, which is convenient for understanding and illustration, and in fig. 8, the terminal device takes 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 means. The processor is mainly configured to process the communication protocol and the communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiments. The memory is used primarily for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the terminal device is turned on, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the 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, which is not limited in this application.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal device, execute a software program, and process data of the software program. The processor in fig. 8 may integrate the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by 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 function 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 realize the baseband processing function.

In the embodiment of the present invention, the antenna and the control circuit with transceiving functions can be regarded as the transceiving unit 81 of the terminal device 800, for example, for supporting the terminal device to perform transceiving functions as performed by the terminal device in the method implementation in fig. 3. A processor having a processing function is considered as the processing unit 82 of the terminal device 800, which corresponds to the processing unit 710 in fig. 7. As shown in fig. 8, the terminal device 800 includes a transceiving unit 81 and a processing unit 82. The transceiving unit may also be referred to as a transceiver, a transceiving device, etc., and corresponds to the transceiving unit 720 in fig. 7. Alternatively, a device for implementing a receiving function in the transceiving unit 81 may be regarded as a receiving unit, and a device for implementing a sending function in the transceiving unit 81 may be regarded as a sending unit, that is, the transceiving 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, and the like, and the sending unit may be referred to as a transmitter, a sending circuit, and the like.

The processing unit 82 is configured to execute the instructions stored in the memory, so as to control the transceiver unit 81 to receive and/or transmit signals, thereby implementing the functions of the terminal device in the above-described method embodiments. As an implementation manner, the function of the transceiving unit 81 may be considered to be implemented by a transceiving circuit or a dedicated chip for transceiving.

It should be understood that terminal device 800 shown in fig. 8 is capable of implementing various processes involving the terminal device in the method embodiment of fig. 3. The operations and/or functions of the modules in the terminal device 800 are respectively to implement the corresponding flows in the above-described method embodiments. Specifically, reference may be made to the description of the above method embodiments, and the detailed description is appropriately omitted herein to avoid redundancy.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method of communication in any of the above method embodiments.

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

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present invention may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in embodiments of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but 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 (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is 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 present application further provides a computer-readable medium, on which a computer program is stored, where the computer program is executed by a computer to implement the method for communication in any of the above method embodiments.

The embodiment of the present application further provides a computer program product, and when executed by a computer, the computer program product implements the communication method in any of the above method embodiments.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

It should be understood that the above describes a method for communication during downlink transmission in a communication system, but the present application is not limited thereto, and optionally, a similar scheme as above may also be adopted during uplink transmission, and details are not described here again to avoid repetition.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on 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 the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

It should also be understood that reference herein to first, second, third, fourth, and various numerical designations is made only for ease of description and is not intended to limit the scope of the embodiments of the present application.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, 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). The procedures or functions described in accordance with the embodiments of the present application are generated in whole or in part when the computer program instructions (programs) are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of data transmission, comprising:

the network equipment determines a plurality of channel correlation values of a plurality of terminal equipment on a first resource unit, wherein the plurality of terminal equipment comprises equipment which uses the first resource unit for communication, and each channel correlation value in the plurality of channel correlation values represents the interference degree between two terminal equipment in the plurality of terminal equipment;

the network device determines a precoding mode corresponding to each terminal device in the plurality of terminal devices according to the plurality of channel correlation values, wherein a first terminal device corresponds to a first precoding mode, the first terminal device is any one of the plurality of terminal devices, and the first precoding mode comprises linear precoding or nonlinear precoding;

the network device transmits data to the first terminal device through the first resource unit by using a first precoding mode corresponding to the first terminal device,

wherein the method further comprises:

the network device sends at least two reference signals to the first terminal device, and phase difference information of the at least two reference signals is related to the first precoding mode.

2. The method of claim 1, further comprising:

the network device determining a size of the first resource unit;

and the network equipment sends first indication information to the first terminal equipment, wherein the first indication information is used for indicating the size of the first resource unit.

3. The method of claim 2, wherein the network device determining the size of the first resource unit comprises:

the network device determines the size of the first resource unit according to the fluctuation degree of the channel correlation of every two terminal devices on the full bandwidth, or

The network device determines the size of the first resource unit according to the size of the scheduling bandwidth of the plurality of terminal devices, or

The network device determines the size of the first resource unit according to the size of the subcarrier spacing in the scheduling bandwidths of the plurality of terminal devices, or

And the network equipment selects one value from a plurality of preset resource unit size values as the size of the first resource unit.

4. The method of claim 1, wherein the network device sends at least two reference signals to the first terminal device, and phase difference information of the at least two reference signals is related to the first precoding scheme, and wherein the method comprises:

and the network equipment transmits a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence through the first resource unit, wherein the phase difference information of the DMRS sequence and the PTRS sequence is related to the first precoding mode.

5. The method of claim 1, wherein the network device sends at least two reference signals to the first terminal device, and phase difference information of the at least two reference signals is related to the first precoding scheme, and wherein the method comprises:

the network device transmits a PTRS sequence through a plurality of symbols in the first resource unit, wherein the plurality of symbols comprise a first symbol set and a second symbol set, and phase difference information of the PTRS sequence on the first symbol set and the PTRS sequence on the second symbol set is related to a precoding mode when the first terminal device uses the first resource unit for communication.

6. The method according to claim 4 or 5,

the phase difference information of the at least two reference signals is further related to a power adjustment mode when the network device transmits data to the first terminal device through the first resource unit.

7. The method according to any one of claims 1 to 3, further comprising:

the network equipment determines a power adjustment mode when data are transmitted to the first terminal equipment through the first resource unit;

and the network device sends third indication information to the first terminal device, wherein the third indication information is used for indicating a power adjustment mode when the network device sends data to the first terminal device through the first resource unit.

8. The method according to any one of claims 1 to 3, further comprising:

and 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 Scheme (MCS) corresponding to the first terminal device, and the MCS is used to indicate a power adjustment mode when the network device sends data to the first terminal device through the first resource unit.

9. A method of data transmission, comprising:

the terminal equipment receives data sent by the network equipment through a first resource unit;

the terminal device demodulates the data by using a first precoding manner corresponding to the terminal device, where the first precoding manner is determined by the network device according to a plurality of channel correlation values of a plurality of terminal devices in the first resource unit, the plurality of terminal devices include devices communicating by using the first resource unit, each of the plurality of channel correlation values represents a degree of interference between two terminal devices in the plurality of terminal devices, and the first precoding manner includes linear precoding or non-linear precoding,

wherein the method further comprises:

the terminal equipment receives at least two reference signals sent by the network equipment, the terminal equipment determines phase difference information of the at least two reference signals, and the terminal equipment determines the first precoding mode according to the phase difference information of the at least two reference signals.

10. The method of claim 9, further comprising:

and the terminal equipment receives first indication information sent by the network equipment, wherein the first indication information is used for indicating the size of the first resource unit.

11. The method according to claim 9, wherein the terminal device receives at least two reference signals sent by the network device, the terminal device determines phase difference information of the at least two reference signals, and the terminal device determines the first precoding scheme according to the phase difference information of the at least two reference signals, including:

the terminal equipment receives a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence which are sent by the network equipment through the first resource unit, determines phase difference information of the DMRS sequence and the PTRS sequence, and determines the first precoding mode according to the phase difference information of the DMRS sequence and the PTRS sequence.

12. The method according to claim 9, wherein the terminal device receives at least two reference signals sent by the network device, the terminal device determines phase difference information of the at least two reference signals, and the terminal device determines the first precoding scheme according to the phase difference information of the at least two reference signals, including:

the terminal device receives a PTRS sequence sent by the network device through a plurality of symbols in the first resource unit, wherein the plurality of symbols comprise a first symbol set and a second symbol set, the terminal device determines phase difference information of the PTRS sequence on the first symbol set and the PTRS sequence on the second symbol set, and the terminal device determines the first precoding mode according to the phase difference information of the PTRS sequence on the first symbol set and the PTRS sequence on the second symbol set.

13. The method according to claim 11 or 12,

the phase difference information of the at least two reference signals is further related to a power adjustment mode when the network device transmits data to the terminal device through the first resource unit.

14. The method according to claim 9 or 10, characterized in that the method further comprises:

and the terminal equipment receives third indication information sent by the network equipment, wherein the third indication information is used for indicating a power adjustment mode when the network equipment sends data to the terminal equipment through the first resource unit.

15. The method according to claim 9 or 10, characterized in that the method further comprises:

the terminal device receives fourth indication information sent by the network device, where the fourth indication information is used to indicate a Modulation and Coding Scheme (MCS) corresponding to the terminal device, and the MCS is used to indicate a power adjustment mode when the network device sends data to the terminal device through the first resource unit.

16. A communications apparatus, comprising:

a processing unit configured to determine a plurality of channel correlation values for a plurality of terminal devices on a first resource unit, wherein the plurality of terminal devices include devices communicating 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;

determining a precoding mode corresponding to each terminal device in the plurality of terminal devices according to the plurality of channel correlation values, wherein a first terminal device corresponds to a first precoding mode, the first terminal device is any one of the plurality of terminal devices, and the first precoding mode comprises linear precoding or nonlinear precoding;

a transceiving unit, configured to transmit data to the first terminal device via the first resource unit using a first precoding scheme corresponding to the first terminal device,

wherein, the transceiver unit is further configured to transmit at least two reference signals to the first terminal device, and phase difference information of the at least two reference signals is related to the first precoding scheme.

17. The communications apparatus as claimed in claim 16, wherein the processing unit is further configured to determine a size of the first resource unit;

18. The communications apparatus as claimed in claim 17, wherein the processing unit is specifically configured to:

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

Determining the size of the first resource unit according to the size of the subcarrier spacing in the scheduling bandwidths of the plurality of terminal devices, or

19. The communications device according to claim 16, wherein the transceiver component is specifically configured to transmit a demodulation reference signal (DMRS) sequence and a Phase Tracking Reference Signal (PTRS) sequence in the first resource unit, and wherein phase difference information between the DMRS sequence and the PTRS sequence is related to the first precoding scheme.

20. The communications apparatus as claimed in claim 16, wherein the transceiver is specifically configured to transmit a PTRS sequence over a plurality of symbols in the first resource unit, wherein the plurality of symbols includes a first set of symbols and a second set of symbols, and phase difference information between the PTRS sequence over the first set of symbols and the PTRS sequence over the second set of symbols is related to the first precoding scheme.

21. The apparatus according to claim 19 or 20, wherein the phase difference information of the at least two reference signals further relates to a power adjustment manner when the transceiver transmits data to the first terminal device via the first resource unit.

22. The apparatus according to any of claims 16 to 18, wherein the processing unit is further configured to determine a power adjustment manner when transmitting data to the first terminal device through the first resource unit;

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 a power adjustment manner when the transceiver unit sends data to the first terminal device through the first resource unit.

23. The apparatus according to any one of claims 16 to 18, wherein the transceiver unit is further configured to transmit fourth indication information to the first terminal device, the fourth indication information indicating a modulation and coding scheme, MCS, corresponding to the first terminal device, wherein the MCS indicates a power adjustment method when the transceiver unit transmits data to the first terminal device in the first resource unit.

24. A communications apparatus, comprising:

the receiving and sending unit is used for receiving data sent by the network equipment through the first resource unit;

a processing unit, configured to demodulate the data using a first precoding scheme corresponding to the communication apparatus, where the first precoding scheme is determined by the network device according to a plurality of channel correlation values of a plurality of terminal devices in the first resource unit, the plurality of terminal devices include devices communicating using the first resource unit, each of the plurality of channel correlation values represents a degree of interference between two terminal devices in the plurality of terminal devices, and the first precoding scheme includes linear precoding or non-linear precoding,

the transceiver unit is further configured to receive at least two reference signals sent by the network device, determine phase difference information of the at least two reference signals, and determine the first precoding manner according to the phase difference information of the at least two reference signals.

25. The apparatus according to claim 24, wherein the transceiver unit is further configured to receive first indication information sent by the network device, and the first indication information is used to indicate a size of the first resource unit.

26. The communications apparatus as claimed in claim 24, wherein the transceiver is specifically configured to receive a DMRS sequence and a PTRS sequence transmitted by the network device through the first resource unit, and further specifically configured to determine phase difference information between the DMRS sequence and the PTRS sequence, and further specifically configured to determine the first precoding scheme according to the phase difference information between the DMRS sequence and the PTRS sequence.

27. The communications apparatus as claimed in claim 24, wherein the transceiver unit is specifically configured to receive a PTRS sequence transmitted by the network device through a plurality of symbols in the first resource unit, wherein the plurality of symbols includes a first symbol set and a second symbol set, the transceiver unit is further specifically configured to determine phase difference information between the PTRS sequence on the first symbol set and the PTRS sequence on the second symbol set, and the transceiver unit is further specifically configured to determine the first precoding manner according to the phase difference information between the PTRS sequence on the first symbol set and the PTRS sequence on the second symbol set.

28. The communication device according to claim 26 or 27,

29. The apparatus according to claim 24 or 25, wherein the transceiver unit is further configured to receive third indication information 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 through the first resource unit.

30. The apparatus according to claim 24 or 25, wherein the transceiver unit is further configured to receive fourth indication information sent by the network device, the fourth indication information indicating a modulation and coding scheme, MCS, corresponding to the terminal device, wherein the MCS is used for indicating a power adjustment scheme when the network device sends data to the terminal device through the first resource unit.

31. A computer-readable storage medium, in which a computer program is stored which, when run on a computer, causes the computer to carry out the method of any one of claims 1 to 15.

32. A communication system comprising a communication apparatus as claimed in any of claims 16 to 23 and a communication apparatus as claimed in any of claims 24 to 30.