Communication method and apparatus

Abstract

A communication method and apparatus. The method comprises: receiving a first reference signal, which is used for channel measurement; and receiving a second reference signal, wherein the second reference signal and the first reference signal are different reference signals, and the first reference signal and the second reference signal has a first association relationship. In the embodiments of the present application, different reference signals in an association relationship can be received, such that a terminal can perform channel measurement on the basis of the reference signals in the association relationship, thereby implementing the reconstruction of a clipped signal.

Description

Communication method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 20, 2023, with application number "202311767668.4" and invention name "Communication Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of communications, and in particular to communication methods and devices. Background Art

[0003] Compared to the fourth-generation (4G) mobile communication system, the fifth-generation (5G) mobile communication system has a dramatically increased network transmission bandwidth. The higher peak-to-average power ratio (PAPR) further reduces the efficiency of the power amplifier (PA). This results in a sharp increase in the transmit power consumption of 5G network equipment. At the same time, the increased number of transmission channels in network equipment has also led to a sharp increase in the static power consumption of 5G mobile communication systems. Clearly, reducing the transmission power consumption of 5G networks is an issue that needs to be addressed. Summary of the Invention

[0004] Embodiments of the present application provide a communication method and apparatus that can receive two different reference signals that are associated with each other, so that a terminal can perform channel measurement based on the different reference signals, thereby reconstructing a clipped signal.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] In a first aspect, a communication method is provided, comprising: receiving a first reference signal, the first reference signal being used for channel measurement; and receiving a second reference signal, wherein the second reference signal is a different reference signal from the first reference signal, and the first reference signal and the second reference signal have a first correlation relationship.

[0007] The embodiment of the present application can receive different reference signals with an associated relationship, so that the terminal can reconstruct the clipped signal according to the reference signals with an associated relationship, thereby achieving the purpose of reducing transmission power consumption.

[0008] In one possible design, the method further includes: measuring the first reference signal to obtain first channel state information. Measuring the second reference signal to obtain second channel state information. The first reference signal and the second reference signal have a first correlation relationship, including: the first channel state information and the second channel state information have a second correlation relationship.

[0009] In the embodiment of the present application, the terminal can measure different reference signals having an associated relationship to obtain corresponding channel state information, so that the terminal can reconstruct the clipped signal based on the obtained channel state information.

[0010] In one possible design, the second association relationship is a mapping relationship.

[0011] The embodiment of the present application provides a first CSI and a second CSI having a mapping relationship, so that the terminal can reconstruct the clipped signal using the first CSI and the second CSI based on the mapping relationship.

[0012] In a possible design, the second association relationship is implemented in the following manner: the first channel state information and the second channel state information are mapped to each other through a preset mapping matrix.

[0013] In the embodiment of the present application, the first CSI may be mapped to the second CSI through a mapping matrix, so that the terminal may reconstruct the clipped signal based on the mapping matrix and using the first CSI and the second CSI.

[0014] In one possible design, the first channel state information is a channel matrix of M1*N1 dimensions, where M1 represents the number of ports on the terminal receiving the first reference signal, and N1 represents the number of ports corresponding to the first reference signal. The second channel state information is a channel matrix of M2*N2 dimensions, where M2 represents the number of ports on the terminal receiving the second reference signal, and N2 represents the number of ports corresponding to the second reference signal.

[0015] The embodiment of the present application provides a method of using a channel matrix to represent channel state information, so that the first channel state information and the second channel state information can be associated based on multiple dimensions of the channel matrix.

[0016] In one possible design, the second association relationship includes that M1 is the same as M2.

[0017] The embodiment of the present application can ensure that the number of ports receiving different reference signals of the terminal is the same, thereby reducing the difference between the first CSI and the second CSI, and at the same time, reducing the complexity of the mapping between the first CSI and the second CSI.

[0018] In one possible design, the second association relationship includes that N2 is smaller than N1.

[0019] The embodiment of the present application can utilize information measured by a greater number of ports to reconstruct information received by a smaller number of ports, thereby improving the accuracy of data reconstruction.

[0020] In one possible design, the difference between the time when the first reference signal is received and the time when the second reference signal is received is less than a preset duration threshold.

[0021] The embodiments of the present application can avoid the lack of reference between two reference signals that are far apart in the time dimension, thereby improving the accuracy of signal reconstruction.

[0022] In one possible design, a clipping coefficient corresponding to the first reference signal is different from a clipping coefficient corresponding to the second reference signal.

[0023] The embodiment of the present application sets different clipping coefficients for different reference signals, thereby making the distortion of one of the reference signals lower and improving the accuracy of reconstructing the clipped signal.

[0024] In one possible design, an error vector magnitude (EVM) corresponding to the first reference signal is less than a first EVM threshold, and / or an EVM corresponding to the second reference signal is less than a second EVM threshold.

[0025] The embodiment of the present application can ensure that the reference signal received by the terminal is relatively accurate and has a small error through the EVM threshold, thereby improving the accuracy of subsequent corresponding processing based on the reference signal.

[0026] In one possible design, the first EVM threshold is less than the second EVM threshold.

[0027] The embodiment of the present application can ensure that the first reference signal received by the terminal is more accurate, so that the more accurate first reference signal can be used to reconstruct the clipped signal, thereby improving the accuracy of signal reconstruction.

[0028] In one possible design, the first reference signal is a channel state information reference signal CSI-RS, and the second reference signal is a demodulation reference signal DMRS.

[0029] The embodiment of the present application provides a possible implementation of the first reference signal and the second reference signal, which is applicable to the reconstruction of the clipped signal based on the CSI-RS and DMRS having an associated relationship.

[0030] According to a second aspect, a communication method is provided, comprising: transmitting a first reference signal for channel measurement; and transmitting a second reference signal, wherein the second reference signal is a different reference signal from the first reference signal and the first reference signal and the second reference signal have a first correlation relationship.

[0031] The embodiment of the present application can receive different reference signals with an associated relationship, so that the terminal can perform channel measurement according to the reference signals with the associated relationship, thereby realizing reconstruction of the clipped signal.

[0032] In one possible design, a first association relationship exists between the first reference signal and the second reference signal, including: a second association relationship exists between the first channel state information and the second channel state information, wherein the first channel state information is obtained by measuring the first reference signal by the terminal, and the second channel state information is obtained by measuring the second reference signal by the terminal.

[0033] In one possible design, the second association relationship is a mapping relationship.

[0034] In a possible design, the second association relationship is implemented in the following manner: the first channel state information and the second channel state information are mapped to each other through a preset mapping matrix.

[0035] In one possible design, the first channel state information is a channel matrix of M1*N1 dimensions, where M1 represents the number of ports on the terminal receiving the first reference signal, and N1 represents the number of ports corresponding to the first reference signal. The second channel state information is a channel matrix of M2*N2 dimensions, where M2 represents the number of ports on the terminal receiving the second reference signal, and N2 represents the number of ports corresponding to the second reference signal.

[0036] In one possible design, the second association relationship includes that M1 is the same as M2.

[0037] In one possible design, the second association relationship includes that N2 is smaller than N1.

[0038] In one possible design, the difference between the time when the first reference signal is sent and the time when the second reference signal is sent is less than a preset duration threshold.

[0039] In one possible design, a clipping coefficient corresponding to the first reference signal is different from a clipping coefficient corresponding to the second reference signal.

[0040] In one possible design, an error vector magnitude (EVM) corresponding to the first reference signal is less than a first EVM threshold, and / or an EVM corresponding to the second reference signal is less than a second EVM threshold.

[0041] In one possible design, the first EVM threshold is less than the second EVM threshold.

[0042] In one possible design, the first reference signal is a channel state information reference signal CSI-RS, and the second reference signal is a demodulation reference signal DMRS.

[0043] In a third aspect, a communication device is provided. The communication device is used to implement the various communication methods involved in the first and / or second aspects above. The communication device includes modules, units, or means corresponding to the above communication methods. The modules, units, or means can be implemented through hardware, software, or hardware executing corresponding software implementations. The hardware or software includes one or more modules or units corresponding to the above functions.

[0044] In a fourth aspect, a communication device is provided, comprising: a processor and a memory, wherein the memory is configured to store computer instructions, and when the processor executes the instructions, the communication device executes the communication method according to any of the above aspects.

[0045] In the fifth aspect, a chip system is provided, which includes a processor and an input / output port, the processor is used to implement the processing functions involved in the communication method of any aspect of the above aspects, and the input / output port is used to implement the transceiver functions involved in the communication method of any aspect of the above aspects.

[0046] In one possible design, the chip system also includes a memory, which is used to store program instructions and data for implementing the functions involved in the communication method of any of the above aspects.

[0047] The chip system may be composed of chips, or may include chips and other discrete devices.

[0048] In a sixth aspect, a communication system is provided, which includes a terminal for executing any method of any of the above aspects, and a network device for executing any method of any of the above aspects.

[0049] In a seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer instructions, which, when executed on a computer, cause the computer to execute any communication method designed in any of the above aspects.

[0050] In an eighth aspect, a computer program product is provided, which includes a computer program or instructions, and when the computer program or instructions are run on a computer, causes the computer to execute any communication method designed in any of the above aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] FIG1 is an exemplary diagram of the architecture of a communication system provided in an embodiment of the present application;

[0052] FIG2 is a schematic diagram of a transmitting end clipping provided in an embodiment of the present application;

[0053] FIG3 is a schematic diagram of a signal reconstruction at a receiving end provided in an embodiment of the present application;

[0054] FIG4 is a schematic diagram of periodic channel state information transmission provided by an embodiment of the present application;

[0055] FIG5 is a schematic diagram of semi-persistent channel state information transmission provided by an embodiment of the present application;

[0056] FIG6 is a schematic diagram of a non-periodic channel state information transmission according to an embodiment of the present application;

[0057] FIG7 is a schematic diagram of a communication scenario provided in an embodiment of the present application;

[0058] FIG8 is a schematic diagram of a communication method provided in an embodiment of the present application;

[0059] FIG9 is a schematic diagram of data communication provided in an embodiment of the present application;

[0060] FIG10 is a schematic diagram of a communication device provided in an embodiment of the present application;

[0061] FIG11 is a schematic diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0063] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0064] The terms "first" and "second" in the description and drawings of the embodiments of the present application are used to distinguish different objects, or to distinguish different treatments of the same object. Words such as "first" and "second" can distinguish between identical or similar items with substantially the same functions and effects. For example, the first device and the second device are merely used to distinguish different devices and do not limit their order. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences.

[0065] "At least one" means one or more, and "a plurality" means two or more.

[0066] In the description of the embodiments of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the embodiments of the present application is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0067] In the description of the embodiments of this application, unless otherwise specified, "multiple" means two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0068] In addition, to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that the words "first" and "second" do not limit the quantity or execution order, and the words "first" and "second" do not necessarily mean different.

[0069] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner to facilitate understanding.

[0070] It will be understood that the “embodiment” mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the embodiment of the present application. Therefore, the various embodiments in the entire specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It will be understood that in the various embodiments of the embodiment of the present application, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

[0071] It can be understood that in the embodiments of the present application, "when" and "if" both mean that corresponding processing will be performed under certain objective circumstances, and do not limit the time, nor do they require any judgment action when implementing, nor do they mean that there are other limitations.

[0072] It is understood that some optional features in the embodiments of the present application may, in certain scenarios, be implemented independently of other features, such as the solution on which they are currently based, to solve corresponding technical problems and achieve corresponding effects. In certain scenarios, they may also be combined with other features as needed. Accordingly, the devices provided in the embodiments of the present application may also implement these features or functions accordingly, which will not be described in detail here.

[0073] In the embodiments of the present application, unless otherwise specified, the same or similar parts between the various embodiments can refer to each other. In the various embodiments of the present application, and the various implementation methods / implementation methods / implementation methods in the various embodiments, if there is no special explanation and logical conflict, the terms and / or descriptions between different embodiments and the various implementation methods / implementation methods / implementation methods in the various embodiments are consistent and can be referenced to each other. The technical features in different embodiments and the various implementation methods / implementation methods / implementation methods in the various embodiments can be combined to form new embodiments, implementation methods, implementation methods, or implementation methods according to their inherent logical relationships. The implementation methods of the embodiments of the present application described below do not constitute a limitation on the scope of protection of the embodiments of the present application.

[0074] FIG1 is an example diagram of the architecture of a communication system provided in an embodiment of the present application.

[0075] As shown in FIG. 1 , the communication system involved in the embodiment of the present application may include at least one terminal 110 and a network device 120 .

[0076] Terminal 110 and network device 120 communicate wirelessly. Network device 120 may be a wireless access network device. Terminals and wireless access network devices may be connected to each other via wired or wireless means. Figure 1 is merely a schematic diagram. The communication system may also include other network devices, such as wireless relay devices, wireless backhaul devices, and core network devices, which are not shown in Figure 1. The connection relationships between devices are not limited to the methods listed above.

[0077] A radio access network device can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a 5G mobile communication system, a next-generation base station in a future mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. It can also be a module or unit that performs some of the functions of a base station, such as a centralized unit (CU) or a distributed unit (DU). The CU performs the functions of the base station's radio resource control protocol and packet data convergence protocol (PDCP), as well as the service data adaptation protocol (SDAP). The DU performs the functions of the base station's radio link control layer and medium access control (MAC) layer, as well as some or all of the physical layer. For detailed descriptions of each of these protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The wireless access network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, etc. In some other embodiments, the wireless access network device may also be an access network device in an open RAN (open RAN, O-RAN). In O-RAN, the CU may be referred to as an open CU (open CU, O-CU), the DU may be referred to as an open DU (open DU, O-DU), and the RU may be referred to as an open RU (open RU, O-RU). The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. The wireless access network device is sometimes also referred to as a network device. For ease of description, the following description takes a base station as an example of a wireless access network device.

[0078] A terminal may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. Terminal devices can be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal devices.

[0079] Base stations and terminals can be fixed or mobile. They can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of base stations and terminal devices.

[0080] Communication between base stations and terminals, between base stations, and between terminals can be carried out through authorized spectrum, unauthorized spectrum, or both; communication can be carried out through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0081] In an embodiment of the present application, the function of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including a base station function. The control subsystem including the base station function here may be a control center in the application scenarios of the above-mentioned terminal devices such as smart grid, industrial control, intelligent transportation, smart city, etc. The function of the repeater may also be performed by a module (such as a chip or a modem) in the repeater, or by a device including a relay function. The function of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including a terminal function.

[0082] A wireless communication system includes communication devices that can communicate wirelessly using air interface resources. These devices can include network devices and terminal devices. Network devices can also be referred to as base stations. Air interface resources can include at least one of time domain resources, frequency domain resources, code resources, and space resources.

[0083] The solutions provided in the embodiments of this application can be applied to wireless communications between communication devices. Wireless communications can include wireless communications between network devices and terminals, wireless communications between network devices, and wireless communications between terminals. In the embodiments of this application, the term "wireless communications" can also be simply referred to as "communication," which can also be described as "data transmission," "information transmission," or "transmission."

[0084] The embodiments of the present application can be used for possible communication links such as uplink (UL), downlink (DL), access link, backhaul link, sidelink (SL), etc., and the embodiments of the present application are not limited here. From the perspective of business scenarios, the embodiments of the present application are applicable to various scenarios, such as layered data coding in XR services, uplink large capacity scenarios, etc., and the embodiments of the present application are not limited here.

[0085] Currently, 5G networks consume dramatically more power than 4G networks. Due to the higher frequency bands used in 5G networks, the coverage area is reduced, and the increasingly dense base station deployment further increases the overall power consumption of the entire network. For example, the power consumption of a single 5G network device is typically two to three times that of a typical 4G network device. For example, the typical power consumption of a single radio remote unit (RRU) in the 4G era can reach approximately 660W. In the 5G era, the typical power consumption of a single active antenna unit (AAU) can increase to approximately 1400W. Clearly, such high energy consumption is not conducive to environmental protection and sustainable social development, and it also results in significant electricity costs. Currently, energy costs account for approximately 23% of operators' overall operating expenses. Therefore, research into green and energy-saving communication technologies is crucial for the continued evolution of 5G.

[0086] One of the main means of reducing the energy consumption of network equipment is to reduce the PAPR of the signal so that the signal operates in the high output power area of ​​the PA and improve the efficiency of the PA.

[0087] Related technologies have proposed reducing PAPR through clipping and reconstruction. Specifically, clipping is performed at the transmitter and the clipped signal is iteratively restored and reconstructed at the receiver. This allows for lossless data transmission with lower PAPR, thereby improving PA efficiency and achieving energy savings.

[0088] Referring to Figure 2, it is assumed that the transmitting end is a network device and the receiving end is a terminal. At the transmitting end, the input signal is a signal with a higher PAPR, which can also be considered as the original signal. It can be observed that the input signal in Figure 2 is divided by two horizontal lines. The PAPR of the signal in the area between the two horizontal lines can be considered to be within the PA operating range, while the signal above the upper horizontal line and below the lower horizontal line can be considered to have a PAPR that exceeds the PA operating range and needs to be clipped. At the transmitting end, after the input signal is clipped by the clipping module, the output signal is a signal with a smaller PAPR. That is, the signal corresponding to the output in Figure 2 can be seen to be completely between the two horizontal lines, that is, the output signal is all within the working range of the PA. The transmitting end can send the clipped signal.

[0089] However, the clipped signal exhibits a certain degree of distortion compared to the original signal, resulting in decreased communication performance. At the receiving end, the input signal can be considered the clipped signal from the transmitter. The receiving end can reconstruct the received signal based on additional auxiliary information, as shown in Figure 3. The signal reconstruction module reconstructs the original signal, compensating for the performance loss caused by signal clipping at the transmitter.

[0090] For the receiving end, the signal model of the received signal can be expressed by Formula 1, Y = HWX + A ... Formula 1

[0091] Among them, Y represents the signal received by the receiver; X represents the signal sent by the transmitter; H represents the communication channel between the transmitter and the receiver; W represents the precoding matrix used by the transmitter when sending data; A represents the noise signal.

[0092] When downlink data, namely the physical downlink shared channel (PDSCH), is sent, in order to enable the terminal to correctly obtain the channel information during downlink data transmission so as to correctly demodulate and receive the data. The network device can insert a demodulation reference signal (DMRS) into the corresponding time-frequency resources during data transmission. Among them, the time-frequency resources occupied by DMRS, the base sequence used, and the sequence value are related to the corresponding number of ports and various configuration methods. The specific configuration method can be implemented with reference to the relevant technology, and the embodiments of the present application will not be repeated here.

[0093] In related technologies, a reference signal (RS) with a known sequence can be sent to measure the channel or interference of a new radio (NR). In some solutions, a channel state information-reference signal (CSI-RS) can be used to measure downlink channel state information.

[0094] For example, the network device sends CSI-RS, and after the terminal receives the CSI-RS, it calculates the indicators to be measured based on the received reference signal. The indicators may include, for example, rank indicator (RI), precoding matrix indicator (PMI), channel quality indicator (CQI), etc. The terminal can report the measured indicators to the network device. For CSI-RS configuration, the two more important parts are CSI-RS report configuration (report config) and CSI-RS resource configuration (resource config). Among them, the CSI-RS report configuration is used to configure parameters related to channel reporting, such as the type of reporting, the reported measurement indicators, etc. The CSI-RS resource configuration is used to configure relevant information of the measured time-frequency resources. The CSI-RS report can report the channel state information (CSI) measured by the terminal.

[0095] For example, the reporting types of CSI can be divided into three types, such as periodic channel state information (P-SCI), semi-persistent channel state information (SP-SCI) and aperiodic channel state information (A-SCI). Among them, P-CSI can be configured through radio resource control (RRC), and after configuration, it does not need to be triggered and sent periodically. For example, as shown in Figure 4, in S101, the network device sends a first RRC signaling to the terminal. The first RRC signaling can be used to configure the reporting type of CSI to P-CSI. Afterwards, in S102, the network device can periodically send CSI-RS to the terminal. In S103, the terminal can also periodically send CSI reports. It can be understood that each CSI report sent periodically in S103 can correspond to a periodically sent CSI-RS, that is, the CSI report is a CSI report obtained by measuring its corresponding CSI-RS. It can be understood that S102 and S103 do not need to be triggered and executed separately, and can be directly executed after being configured by the first RRC signaling in S101.

[0096] For another example, SP-CSI can be configured through RRC, and after configuration, it can be triggered by a MAC control element (CE) or downlink control information (DCI). After triggering, it is sent periodically. For example, as shown in Figure 5, the network device in S201 sends a second RRC signaling to the terminal. The second RRC signaling can be used to configure the reporting type of CSI to SP-CSI. Afterwards, the network device in S202 sends a first trigger information to the terminal. The first trigger information can be, for example, a MAC CE or a first DCI. After being triggered by the first trigger information, the network device in S203 can periodically send CSI-RS to the terminal. The terminal can also periodically send CSI reports in S204. S203 is similar to S102, and S204 is similar to S103. The embodiments of the present application will not be repeated here.

[0097] For another example, A-CSI can be configured through RRC and triggered through DCI after configuration. After triggering, it is reported once on the specified physical uplink control channel (PUCCH) within the specified time slot. For example, as shown in Figure 6, in S301, the network device sends a third RRC signaling to the terminal. The third RRC signaling can be used to configure the reporting type of CSI to A-CSI. Afterwards, in S302, the network device sends a second trigger information to the terminal. The second trigger information can be, for example, a second DCI. Then, in S303, the network device sends CSI-RS to the terminal. In S304, the terminal sends a CSI report on the specified PUCCH within the specified time slot.

[0098] In some examples, CSI reporting types may include wideband feedback and narrowband feedback. Wideband feedback refers to reporting a single value for the entire bandwidth, while narrowband feedback refers to providing CSI feedback for each subband. For the size of each subband, see the example shown in Table 1.

[0099] Table 1

[0100] Among them, the bandwidth part (BWP) is often a pre-configured fixed size. Therefore, for a fixed BWP, the number of physical resource blocks (PRBs) included in each subband is also fixed. For example, assuming a BWP includes 50 PRBs, then its subband size is 4 or 8, that is, each subband includes 4 PRBs or 8 PRBs. The specific size can be configured by high-level signaling. Of course, Table 1 is only a possible exemplary description, and the various embodiments of the present application do not limit the specific correspondence between BWP and subband size and the specific size.

[0101] In some examples, for narrowband feedback, the feedback may be discrete or continuous.

[0102] In some examples, CSI-RS resource configurations may include periodic, semi-persistent, and aperiodic. There is a relationship between the corresponding channel state reporting type and its corresponding resource configuration method. For example, Table 2 shows a relationship between CSI reporting and CSI-RS resources.

[0103] Table 2

[0104] As shown in Table 2, periodically configured CSI-RS resources can support P-CSI reporting, SP-CSI reporting, and A-CSI reporting. Semi-persistently configured CSI-RS resources can support SP-CSI reporting and A-CSI reporting. Aperiodically configured CSI-RS resources only support A-CSI reporting.

[0105] Of course, for how the terminal performs P-CSI reporting, SP-CSI reporting and / or A-CSI reporting, please refer to the embodiments corresponding to Figures 4 to 6, and the embodiments of the present application will not be repeated here.

[0106] In some examples, CSI-RS resources can be functionally divided into non-zero power (NZP) CSI-RS channel, zero power (ZP) CSI-RS interference, and NZP-CSI-RS for interference. Among them, NZP-CSI-RS for channel means NZP-CSI-RS used for channel measurement. In the related art, this resource configuration is a mandatory configuration. ZP-CSI-RS for interference means ZP-CSI-RS used for interference measurement. This type of configuration is an optional configuration. If configured, the resources in the ZP-CSI-RS for interference resource set correspond one-to-one to the resources in the NZP-CSI-RS for channel resource set. NZP-CSI-RS for interference means NZP-CSI-RS used to measure interference. This type of configuration is an optional configuration.

[0107] It's understandable that the essence of ZP-CSI-RS is that the network device doesn't transmit any information on the configured ZP-CSI-RS. When a terminal detects this resource, the detected signal is considered an interference signal because the network device doesn't transmit any information. In contrast, with NZP-CSI-RS, the network device transmits a known sequence on the configured resource. This known sequence allows the terminal to determine the channel and / or interference.

[0108] As can be seen from the above examples, both CSI-RS and DMRS are reference signals that can be used to measure channels. However, DMRS measures the channel during data transmission, while the relationship between the channel measured by CSI-RS and the channel during data transmission is still unclear.

[0109] Currently, to implement the clipping reconstruction solution, auxiliary information may include H and HW shown in Formula 1. It is assumed that HW can be measured using DMRS, but H in HW is currently not possible through DMRS measurement. The aforementioned embodiments involve using CSI-RS to measure channels. However, there is no relationship between DMRS and CSI-RS, and the terminal cannot use CSI-RS to measure H in HW. As a result, the terminal cannot accurately reconstruct the clipped signal, resulting in degraded communication performance.

[0110] Therefore, an embodiment of the present application provides a communication method in which a terminal can receive two different reference signals, which are associated with each other, so that the terminal can reconcile the clipped signal based on the associated reference signals and achieve the purpose of reducing transmission power consumption.

[0111] Figure 7 is a schematic diagram of a communication scenario provided in an embodiment of the present application. As shown in Figure 7, a schematic diagram of the architecture of a possible communication system is shown. The communication system may include a wireless access network 200 and a core network 300. For example, the communication system may also include the Internet 400. The wireless access network 200 may include at least one wireless access network device, namely 210a and 210b in Figure 7. The wireless access network device may be the network device 120 mentioned in Figure 1. The wireless access network 200 may also include at least one terminal, namely 220a to 220j in Figure 7. The terminal may be the terminal 110 mentioned in Figure 1. The terminal may be connected to the wireless access network device via wireless means, and the wireless access network device may be connected to the core network via wireless or wired means.

[0112] In some examples, the core network equipment and the radio access network equipment can be independent and distinct physical devices, or the core network equipment functions and the radio access network equipment logical functions can be integrated into the same physical device, or a single physical device can integrate some of the core network equipment functions and some of the radio access network equipment functions. Terminals and radio access network equipment can be connected to each other via wired or wireless means.

[0113] In some examples, the communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. For details, please refer to the description of the corresponding embodiment of Figure 1, and the embodiments of this application will not be repeated here.

[0114] It's worth noting that the roles of base stations and terminals can be relative. For example, the helicopter or drone 220i in Figure 7 can be configured as a mobile base station. To the terminal 220j accessing the wireless access network 200 via 220i, 220i is a base station; however, to base station 210a, 220i is a terminal, meaning that communication between 210a and 220i occurs via a wireless air interface protocol. Of course, communication between 210a and 220i can also occur via a base station-to-base station interface protocol. In this case, 220i is also a base station relative to 210a. Therefore, base stations and terminals can be collectively referred to as communication devices. 210a and 210b in Figure 7 can be referred to as communication devices with base station functionality, while 220a-220j in Figure 7 can be referred to as communication devices with terminal functionality.

[0115] FIG8 is a schematic diagram of a communication method provided in an embodiment of the present application.

[0116] As shown in FIG8 , the communication process can be applied to, but not limited to, the communication scenarios shown in FIG1 and FIG7 . The method may include the following steps:

[0117] S401: A network device sends a first reference signal to a terminal.

[0118] In some embodiments, the network device may send a first reference signal to the terminal, where the first reference signal may be used for channel measurement. In some embodiments, the terminal may receive the first reference signal sent by the network device.

[0119] In some embodiments, the network devices involved in various embodiments of the present application can be used to send downlink common signals, physical downlink control channels (PDCCH), PDSCH, CSI-RS for downlink channel measurement, etc. The network devices can also receive uplink signals sent by the terminal.

[0120] In some embodiments, the terminal involved in each embodiment of the present application can receive or detect a downlink common signal sent by a network device. The terminal can also send an uplink signal.

[0121] In some embodiments, a terminal receives a first reference signal and may measure the first reference signal to obtain first CSI. For example, the first CSI may include RI, PMI, CQI, etc. measured based on the first reference signal. For example, referring to Formula 1, the terminal may use the received signal as Y and the first reference signal known in advance by the terminal as X. The terminal may obtain an estimated value of H*W based on Y and X as the first CSI.

[0122] In some embodiments, the first CSI may be a channel matrix, the dimension of which may be M1*N1. M1 represents the number of ports at which the terminal receives the first reference signal. N1 represents the number of ports corresponding to the first reference signal. For example, assuming that the first reference signal is CSI-RS, N1 may be represented as the number of CSI-RS ports. In other words, N1 may be represented as the number of ports used by the transmitting end when sending the first reference signal. It will be understood that M1 and N1 represent different numbers of ports. For example, the number of ports at which the terminal receives the first reference signal is 5, while the number of ports corresponding to the first reference signal may be 8.

[0123] It can be understood that in each embodiment of the present application, the port corresponding to the reference signal can also be called the port of the reference signal, and can be represented as the port used when sending the reference signal.

[0124] In this case, the signal model of the first reference signal received by the terminal can be expressed as Y1 = H1 * X1 + A1. H1 represents the first CSI, i.e., the channel matrix with dimensions M1 * N1. Y1 represents the first reference signal actually received by the terminal. X1 represents the first reference signal sent by the network device. A1 represents the interference and / or noise encountered by the first reference signal during propagation.

[0125] In some embodiments, the first reference signal may be a CSI-RS. Of course, in other embodiments, the first reference signal may also be any other possible reference signal, such as a reference signal dedicated to channel measurement, which is not limited in the present embodiment. It will be appreciated that if the first reference signal is a CSI-RS, the changes to the reference signals defined in the current communication system are minimal.

[0126] S402: The network device sends a second reference signal to the terminal.

[0127] In some embodiments, a network device may transmit a second reference signal to a terminal, where the second reference signal may be used for channel measurement. The second reference signal is a reference signal different from the first reference signal. In some embodiments, the terminal may receive the second reference signal transmitted by the network device. In some examples, the first reference signal and the second reference signal have a first correlation relationship.

[0128] Refer to Figure 9 for a data communication diagram. The left side of the channel is the transmitter, and the right side of the channel is the receiver. The transmitter can be, for example, a network device, and the receiver can be, for example, a terminal. For the transmitter, data is converted through the precoding matrix W1 via the DMRS port to obtain data corresponding to the CSI-RS port. The data corresponding to the CSI-RS port is then converted through the precoding matrix W2 to obtain data corresponding to the transmitter and receiver (TRX) channel. The data corresponding to the TRX channel is converted through the coding matrix W3 to obtain the data actually sent by the transmitter.

[0129] Assuming that the data corresponding to the DMRS port is x, the data corresponding to the CSI-RS port can be recorded as W1x, the data corresponding to the TRX channel can be recorded as W2W1x, and the data actually sent by the transmitter can be recorded as W3W2W1x. For the receiving end, the channel obtained by DMRS measurement, that is, the channel for data transmission, can be expressed as H'W3W2W1. Among them, H' is the channel H' in Figure 9. The channel obtained by CSI-RS measurement can be expressed as H'W3W2. In other words, the DMRS port can be mapped to the CSI-RS port through W1. In some examples, the W1 used for different network devices can be different. For example, if the first reference signal is CSI-RS and the second reference signal is DMRS, the CSI-RS can be sent through the CSI-RS port, and the DMRS can be sent through the DMRS port. Then the DMRS port and the CSI-RS port can be mapped through W1, which can also be understood as the second reference signal and the first reference signal can be mapped through W1.

[0130] In some examples, referring to the signal model described in Formula 1, W in Formula 1 can be considered to be the precoding matrix corresponding to the DMRS, such as W3W2W1. H in Formula 1 is the channel H' in Figure 9. For example, assuming that H in Formula 1 is H'W3W2, then W in Formula 1 can be W1. Of course, there are many ways to split and correspond between H, W, and H'W3W2W1 in Formula 1, which are not limited in this embodiment of the present application.

[0131] In some embodiments, the first association relationship between the first reference signal and the second reference signal can be reflected by the association relationship between the signals sent on the port. Referring to Figure 9, assuming that the first reference signal is CSI-RS and the second reference signal is DMRS, then the signal sent on the CSI-RS port and the signal sent on the DMRS port can be considered to have an association relationship, for example, which can be called a third association relationship. It can be understood that CSI-RS can be regarded as one of the signals sent on the CSI-RS port. For example, the signal sent on the CSI-RS port can also include data signals, etc. Similarly, DMRS can be regarded as one of the signals sent on the DMRS port. For example, the signal sent on the DMRS port can also include data signals, etc.

[0132] In some examples, it can be assumed that the port that transmits the first reference signal is the first port, and the port that transmits the second reference signal is the second port. Because the signal transmitted on the first port and the signal transmitted on the second port have a third association relationship, and the first reference signal is a signal transmitted via the first port, and the second reference signal is a signal transmitted via the second port, one embodiment is that the first reference signal and the second reference signal can be considered to have a first association relationship.

[0133] In some examples, the signal sent on the first port and the signal sent on the second port can be mapped to each other via a pre-defined mapping matrix. That is, the first association relationship can use the mapping matrix to map the signal sent on the first port to the signal sent on the second port, or vice versa. Assume that the signal sent on the first port is denoted as P and the signal sent on the second port is denoted as Q. The mapping relationship between the signal sent on the first port and the signal sent on the second port can be expressed by Formula 2: P = K*Q ... Formula 2

[0134] Where K represents a pre-set mapping matrix and “*” represents matrix multiplication. The dimension of P is N1 rows and 1 column, for example, Where Pi represents the signal sent by the i-th first port. If the signal sent on the first port is CSI-RS, Pi can represent the signal sent by the i-th CSI-RS port, such as the CSI-RS sent. i ranges from 1 to N1, where N1 is a positive integer. N1 represents the number of ports of the first port, that is, the number of ports corresponding to the first reference signal. "T" represents the transpose of the matrix. The dimension of Q is N2 rows and 1 column, for example, it can be expressed as Wherein, Qj represents the signal sent by the j-th second port. If the signal sent on the second port is DMRS, Qj can represent the signal sent by the j-th DMRS port, such as the transmitted DMRS. j ranges from 1 to N2, where N2 is a positive integer. N2 represents the port number of the second port, that is, the number of ports corresponding to the second reference signal. For example, assuming that the second reference signal is DMRS, N2 can be represented by the port number of the DMRS port shown in Figure 9. In other words, N2 can be represented by the number of ports used by the transmitting end when sending the second reference signal.

[0135] In some embodiments, the dimension of the mapping matrix K may be N1*N2. Assuming that the first reference signal is a CSI-RS and the second reference signal is a DMRS, K may represent a mapping matrix from a DMRS port to a CSI-RS port.

[0136] Assume that the first reference signal is a CSI-RS and the second reference signal is a DMRS. As can be understood from Formula 2, the signal transmitted on each DMRS port can be mapped to a signal transmitted on a specific CSI-RS port using a mapping matrix. For example, the signal transmitted on the first DMRS port can be mapped to a signal transmitted on the first CSI-RS port using a mapping matrix. In some examples, for non-codebook-based communication schemes, the mapping matrix K can be an identity matrix.

[0137] In some embodiments, the terminal receives a second reference signal and may measure the second reference signal to obtain second CSI. For example, the second CSI may include RI, PMI, CQI, etc. obtained by measuring the second reference signal.

[0138] In some embodiments, a second correlation relationship exists between the first CSI and the second CSI. The first correlation relationship can be reflected by the second correlation relationship. That is, the correlation relationship between the first reference signal and the second reference signal can be reflected by the correlation relationship between the measured first CSI and the second CSI.

[0139] In some embodiments, the second CSI may be a channel matrix whose dimensions may be M2*N2. M2 represents the number of ports on the terminal that receive the second reference signal. It will be appreciated that M2 and N2 represent different numbers of ports. For example, if the number of ports on the terminal that receive the second reference signal is 3, the number of ports corresponding to the second reference signal may be 6.

[0140] In this case, the signal model of the second reference signal received by the terminal can be expressed as Y2 = H2 * X2 + A2. H2 represents the second CSI, i.e., the channel matrix with dimensions M2 * N2. Y2 represents the second reference signal actually received by the terminal. X2 represents the second reference signal sent by the network device. A2 represents the interference and / or noise encountered by the second reference signal during propagation.

[0141] In some embodiments, the second reference signal may be a DMRS. In some examples, when a terminal performs clipping reconstruction, the channel information obtained by measuring the DMRS can be considered similar to the channel information corresponding to the downlink data. Because the process of the DMRS is exactly the same as that of the downlink data, the DMRS can fully simulate the process of downlink data transmission. In the clipping reconstruction scenario, the terminal can measure a first reference signal associated with the DMRS, such as the CSI-RS, to reconstruct the clipped signal based on these two associated reference signals.

[0142] The embodiment of the present application can receive different reference signals with an associated relationship, so that the terminal can reconstruct the clipped signal according to the reference signals with an associated relationship, thereby achieving the purpose of reducing transmission power consumption.

[0143] In the communication method provided in the embodiment of the present application, the second association relationship may be a mapping relationship.

[0144] In some embodiments, a mapping relationship may exist between the first CSI and the second CSI, that is, the first CSI may be mapped to the second CSI, and vice versa.

[0145] For example, a mapping relationship between the first CSI and the second CSI may be preset. The first CSI may be mapped to the second CSI according to the mapping relationship. Of course, the second CSI may also be mapped to the first CSI according to the mapping relationship.

[0146] The embodiment of the present application provides a first CSI and a second CSI having a mapping relationship, so that the terminal can reconstruct the clipped signal using the first CSI and the second CSI based on the mapping relationship.

[0147] In some embodiments, the first CSI and the second CSI may be mapped to each other via a pre-defined mapping matrix. That is, the second association relationship may map the first CSI to the second CSI, or vice versa, via the mapping matrix. Assume that the first CSI is denoted as H1 and the second CSI is denoted as H2. The mapping relationship between the first CSI and the second CSI can be expressed by Formula 3: H2 = H1 * K ...Formula 3

[0148] Formula 3 is similar to Formula 2, with the same parameter K, representing a pre-set mapping matrix. H1, as in the aforementioned embodiment, represents the first CSI, and H2, as in the aforementioned embodiment, represents the second CSI. For example, if the first CSI and the second CSI are channel matrices, the dimensions of the channel matrices corresponding to the first CSI and the second CSI, respectively, can be found in the description of the corresponding embodiments above and are not further described in this embodiment.

[0149] In some examples, a first correlation relationship exists between a first reference signal and a second reference signal, and the first CSI is obtained by measuring the first reference signal, and the second CSI is obtained by measuring the second reference signal. The first correlation relationship between the first reference signal and the second reference signal can be reflected by a second correlation relationship between the first CSI and the second CSI.

[0150] In some examples, according to Formula 1 and Formula 3, a signal expression of the second reference signal received by the terminal can be obtained as Y2=H1*K*X2+A2.

[0151] In the embodiment of the present application, the first CSI may be mapped to the second CSI through a mapping matrix, so that the terminal may reconstruct the clipped signal based on the mapping matrix and using the first CSI and the second CSI.

[0152] In the communication method provided in the embodiment of the present application, the second association relationship may include M1 and M2 being the same.

[0153] In some embodiments, M1 corresponding to the first CSI and M2 corresponding to the second CSI can be made the same, that is, the number of ports on the terminal receiving the first reference signal and the number of ports on the terminal receiving the second reference signal are the same. It will be appreciated that making M1 and M2 the same ensures that the number of ports on the terminal receiving different reference signals is the same, thereby reducing the difference between the first and second CSIs. This also reduces the complexity of the mapping between the first and second CSIs.

[0154] In some embodiments, M1 and M2 may be different. In some examples, M1 and M2 may have a third relationship, such as M1 equal to B times M2, where B is any positive number.

[0155] In the communication method provided in the embodiment of the present application, the second association relationship includes N2 being smaller than N1.

[0156] In some embodiments, N2 corresponding to the second CSI can be made smaller than N1 corresponding to the first CSI, that is, the number of ports corresponding to the second reference signal is smaller than the number of ports corresponding to the first reference signal. In some examples, assuming that the first reference signal is CSI-RS and the second reference signal is DMRS, in the scenario where the terminal reconstructs the clipped signal, the terminal needs to recover the received data. Assuming that the number of ports corresponding to DMRS is smaller than the number of ports corresponding to CSI-RS, the first CSI obtained based on the CSI-RS measurement is used for signal reconstruction during the terminal's signal reconstruction process, which means that the terminal uses the first CSI measured by the CSI-RS with a larger number of ports to reconstruct the data received based on the DMRS port, thereby improving the accuracy of data reconstruction. In simple terms, it is possible to use information measured by a larger number of ports to reconstruct information received by a smaller number of ports, thereby improving the accuracy of data reconstruction.

[0157] From another perspective, for network devices transmitting reference signals, a greater number of signal transmission ports means greater time-frequency resource overhead, but more accurate channel information can be obtained. DMRS is transmitted more frequently than CSI-RS because more PDSCHs are transmitted, and each PDSCH has its own corresponding DMRS. Therefore, N2 corresponding to the second CSI is smaller than N1 corresponding to the first CSI, ensuring that sending DMRS incurs less overhead and that CSI-RS can provide more accurate CSI.

[0158] Of course, in other examples, N2 may be equal to N1. In other examples, N2 may be greater than N1. However, in general, it is preferred that N2 be greater than or equal to N1.

[0159] In some embodiments, the second association relationship may include that M1 is the same as M2, and N2 is smaller than N1.

[0160] In the communication method provided in the embodiment of the present application, the difference between the time when the terminal receives the first reference signal and the time when the terminal receives the second reference signal is less than a preset duration threshold.

[0161] In some embodiments, the difference between the time t1 at which the terminal receives the first reference signal and the time t2 at which the terminal receives the second reference signal may be less than a preset duration threshold. For example, during the process of reconstructing the clipped signal, the terminal uses the first reference signal and the second reference signal received within the duration range corresponding to the duration threshold to perform signal reconstruction. The reason for setting the difference between t1 and t2 to be less than the preset duration threshold is that the terminal hopes that the reference signals received during signal reconstruction are relatively close in time. This avoids the lack of reference between two reference signals that are far apart in the time dimension, thereby improving the accuracy of signal reconstruction.

[0162] In some examples, the unit of the duration threshold may be a frame, a subframe, a slot, a symbol, etc.

[0163] In some examples, the duration threshold mentioned in the above embodiments may be referred to as a first duration threshold. The difference between time t3 when the network device transmits the first reference signal and time t4 when the network device transmits the second reference signal may also be less than a pre-set second duration threshold. For example, the first duration threshold and the second duration threshold are the same. In another example, the first duration threshold and the second duration threshold are different. For example, the second duration threshold is less than the first duration threshold.

[0164] It can be understood that since channel conditions fluctuate randomly over time, the longer the time interval, the greater the difference between the CSI measured based on the first reference signal and the second reference signal. Therefore, by ensuring that the difference between t1 and t2 is less than a preset duration threshold, a good correlation can be ensured between the CSI measured based on the first reference signal and the second reference signal.

[0165] In the communication method provided in the embodiment of the present application, the clipping coefficient corresponding to the first reference signal is different from the clipping coefficient corresponding to the second reference signal.

[0166] In some embodiments, when a network device and a terminal utilize a clipping reconstruction method for communication, the clipping coefficient corresponding to the first reference signal differs from the clipping coefficient corresponding to the second reference signal. The larger the clipping coefficient corresponding to the reference signal, the lower the PAPR of the transmitted reference signal, and the correspondingly greater the distortion of the reference signal. In some examples, the clipping coefficient corresponding to the first reference signal can be set to be smaller than the clipping coefficient corresponding to the second reference signal to ensure that the distortion of the first reference signal is smaller than the distortion of the second reference signal, i.e., the first reference signal received by the terminal is more accurate than the second reference signal.

[0167] The embodiment of the present application sets different clipping coefficients for different reference signals, thereby making the distortion of one of the reference signals lower and improving the accuracy of reconstructing the clipped signal.

[0168] In the communication method provided in an embodiment of the present application, the error vector magnitude (EVM) corresponding to the first reference signal is less than a first EVM threshold. And / or, the EVM corresponding to the second reference signal is less than a second EVM threshold. EVM can indicate signal distortion. For example, a larger EVM indicates greater signal distortion. In some examples, the size of the clipping coefficient can be positively correlated with the size of the EVM, such that a larger clipping coefficient indicates a larger EVM.

[0169] In some embodiments, the EVM corresponding to the first reference signal is less than a first EVM threshold. The first EVM threshold can be preset or protocol-defined. It is understood that the purpose of having the EVM corresponding to the first reference signal be less than the first EVM threshold is to ensure that the first reference signal has minimal error during communication. In other words, the terminal only performs processing based on the first reference signal whose EVM is less than the first EVM threshold, such as reconstructing a clipped signal. Reference signals with a larger EVM are not used.

[0170] In some embodiments, the EVM corresponding to the second reference signal is less than a second EVM threshold. The second EVM threshold may be pre-set or protocol-defined. It is understood that setting the EVM corresponding to the second reference signal to be less than the second EVM threshold is similar to setting the EVM corresponding to the first reference signal to be less than the first EVM threshold, and the present embodiment will not be further described herein.

[0171] The embodiment of the present application can ensure that the reference signal received by the terminal is relatively accurate and has a small error through the EVM threshold, thereby improving the accuracy of subsequent corresponding processing based on the reference signal.

[0172] In some embodiments, the first EVM threshold can be set to be smaller than the second EVM threshold. It can be understood that the embodiment of the present application can ensure that the distortion of the first reference signal is smaller than the distortion of the second reference signal by setting the first EVM threshold to be smaller than the second EVM threshold. Since the distortion of the first reference signal is smaller, it can be considered that the CSI measured by the first reference signal is more accurate. The CSI measured by the first reference signal can better recover the data signal. Although the distortion of the second reference signal is greater, which means that the PDSCH distortion is greater, the larger the EVM, the larger the clipping coefficient, which makes the PAPR of the PDSCH smaller, thereby achieving better energy saving effect.

[0173] In this embodiment of the present application, the first EVM threshold can be set to be lower than the second EVM threshold, so that the first reference signal has a lower EVM than the second reference signal. This ensures that the first reference signal received by the terminal is more accurate. This allows the more accurate first reference signal to be used to reconstruct the clipped signal, improving the accuracy of signal reconstruction.

[0174] In the communication method provided in the embodiment of the present application, the terminal can reconstruct the clipped signal. For example, the terminal can measure the first reference signal to obtain the first CSI. And, the terminal can measure the second reference signal to obtain the second CSI. The terminal recovers the received data, such as the data corresponding to the PDSCH received by the terminal, based on the first CSI and the second CSI, and based on the association between the first CSI and the second CSI. For example, the terminal can perform iterative recovery processing. Of course, the specific iterative recovery processing process can refer to the relevant technology, and the embodiment of the present application will not be repeated here.

[0175] In the embodiment of the present application, the first reference signal and the second reference signal have an associated relationship, which can be reflected by the associated relationship between the first CSI and the second CSI. Assuming that the first reference signal is a CSI-RS and the second reference signal is a DMRS, the CSI-RS ports and the DMRS ports can be mapped to each other through a mapping matrix, thereby achieving the mutual association between the CSI-RS and the DMRS.

[0176] In scenarios where the terminal performs iterative processing to recover the clipped signal, PAPR can be reduced to achieve energy saving, and the accuracy of signal recovery can also be improved, achieving lossless performance to a certain extent.

[0177] It should be noted that the above-mentioned multiple embodiments can be combined and the combined solutions can be implemented. Optionally, some operations in the process of each method embodiment are optionally combined, and / or the order of some operations is optionally changed. In addition, the execution order between the steps of each process is only exemplary and does not constitute a limitation on the execution order between the steps. There can also be other execution orders between the steps. It is not intended to indicate that the execution order is the only order in which these operations can be performed. Ordinary technicians in this field will think of many ways to reorder the operations of this article. In addition, it should be pointed out that the process details involved in a certain embodiment of this article are also applicable to other embodiments in a similar manner, or different embodiments can be used in combination.

[0178] It is understood that in order to implement the functions in the above embodiments, the base station and the terminal include hardware structures and / or software modules that perform the corresponding functions. Those skilled in the art should readily appreciate that, in combination with the units and method steps of the various examples described in the embodiments disclosed in the present application, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a computer software-driven hardware manner depends on the specific application scenario and design constraints of the technical solution.

[0179] Figures 10 and 11 are schematic diagrams of possible communication devices provided in embodiments of the present application. These communication devices can be used to implement the functions of the transmitter or receiver in the above-described method embodiments, thereby also achieving the beneficial effects of the above-described method embodiments. In the embodiments of the present application, the communication device can be a terminal or a network device, or a module applied to a terminal or a network device. For example, a chip.

[0180] As shown in Figure 10, the communication device 1000 includes a processing unit 1010 and a transceiver unit 1020. The communication device 1000 is used to implement the functions of the terminal or network device in the method embodiment shown in Figure 8 above.

[0181] When the communication device 1000 is used to implement the functions of the terminal in the method embodiment shown in FIG8 , the transceiver unit 1020 is used to receive the first reference signal. The processing unit 1010 is used to perform all operations performed by the terminal in the embodiment shown in FIG8 , except for the transceiver operations, and / or to support other processes of the technology described herein.

[0182] When the communication apparatus 1000 is used to implement the functions of the network device in the method embodiment shown in FIG8 , the transceiver unit 1020 is used to transmit the first reference signal. The processing unit 1010 is used to perform all operations performed by the network device in the embodiment shown in FIG8 , except for the transceiver operations, and / or to support other processes of the technology described herein.

[0183] For a more detailed description of the processing unit 1010 and the transceiver unit 1020, please refer to the relevant description of the method embodiment shown in Figure 8. The processing unit 1010 and the transceiver unit 1020 may also perform other steps, and the specific implementation can refer to the method embodiment, which will not be repeated here.

[0184] Optionally, the transceiver unit 1020 may be a transceiver, which may include an antenna and a radio frequency circuit, etc.

[0185] The processing unit 1010 may be a processor (or a processing circuit), such as a baseband processor, which may include one or more CPUs.

[0186] As shown in Figure 11, communication device 1100 includes a processor 1110 and an interface circuit 1120. Processor 1110 and interface circuit 1120 are coupled to each other. It will be appreciated that interface circuit 1120 may be a transceiver or an input / output interface. Optionally, communication device 1100 may further include a memory 1130 for storing instructions executed by processor 1110, input data required by processor 1110 to execute instructions, or data generated by processor 1110 after executing instructions.

[0187] When the communication device 1100 is used to implement the method shown in FIG. 8 , etc., the processor 1110 is used to implement the functions of the processing unit 1010 , and the interface circuit 1120 is used to implement the functions of the transceiver unit 1020 .

[0188] When the communication device is a chip used in a terminal, the terminal chip implements the functions of the terminal in the above-mentioned method embodiment. When the terminal chip receives information from the network device, it can be understood that the information is first received by other modules in the terminal (such as a radio frequency module or antenna) and then sent to the terminal chip by these modules. When the terminal chip sends information to the network device, it can be understood that the information is first sent to other modules in the terminal (such as a radio frequency module or antenna) and then sent to the network device by these modules.

[0189] When the communication device is a chip used in a network device, the network device chip implements the functions of the network device in the above method embodiments. When the network device chip receives information from a terminal, it can be understood that the information is first received by other modules in the network device (such as a radio frequency module or antenna) and then sent to the network device chip by these modules. When the network device chip sends information to a terminal, it can be understood that the information is sent to other modules in the network device (such as a radio frequency module or antenna) and then sent to the terminal by these modules.

[0190] The communication device shown in FIG. 10 or 11 is merely an example, and in actual applications the communication device may have more or fewer components than those shown in FIG. 10 or 11 , may combine two or more components, or may have a different component configuration.

[0191] In the embodiments of the present application, when entity A sends information to entity B, A may send the information directly to B or indirectly to B through another entity. Similarly, when entity B receives information from entity A, entity B may directly receive the information sent by entity A or indirectly receive the information sent by entity A through another entity. Entities A and B herein may be RAN nodes or terminals, or modules within a RAN node or terminal. The sending and receiving of information may be information exchange between a RAN node and a terminal, for example, information exchange between a network device and a terminal; the sending and receiving of information may also be information exchange between two RAN nodes, for example, information exchange between a CU and a DU; the sending and receiving of information may also be information exchange between different modules within a device, for example, information exchange between a terminal chip and other modules of the terminal, or information exchange between a network device chip and other modules within the network device.

[0192] In the embodiments of the present application, a network device sends downlink signals or downlink information to a terminal device, and the downlink information is carried on a downlink channel. The terminal device sends uplink signals or uplink information to the network device, and the uplink information is carried on an uplink channel. To communicate with the network device, the terminal device needs to establish a wireless connection with a cell controlled by the network device. The cell with which the terminal device has established a wireless connection is called the serving cell of the terminal device.

[0193] It can be understood that in the embodiment of the present application, PDSCH and PUSCH are only used as examples of downlink data channels and uplink data channels. In different systems and different scenarios, data channels and control channels may have different names, and the embodiment of the present application does not limit this.

[0194] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0195] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal. The processor and storage medium can also exist in a network device or a terminal as discrete components.

[0196] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0197] In each embodiment of the present application, unless otherwise specified or provided by logic, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0198] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that: include: receiving a first reference signal, where the first reference signal is used for channel measurement; A second reference signal is received, wherein the second reference signal and the first reference signal are different reference signals, and the first reference signal and the second reference signal have a first correlation relationship.

2. The method according to claim 1, characterized in that The method further comprises: measuring the first reference signal to obtain first channel state information; measuring the second reference signal to obtain second channel state information; There is a first association relationship between the first reference signal and the second reference signal, including: there is a second association relationship between the first channel state information and the second channel state information.

3. The method according to claim 2, characterized in that The second association relationship is a mapping relationship.

4. The method according to claim 2 or 3, characterized in that: The second association relationship is achieved in the following manner: The first channel state information and the second channel state information are mapped to each other through a preset mapping matrix.

5. The method according to claim 2, characterized in that: The first channel state information is a channel matrix of M1*N1 dimension, wherein M1 represents the number of ports of the terminal receiving the first reference signal, and N1 represents the number of ports corresponding to the first reference signal; The second channel state information is a channel matrix of M2*N2 dimension, wherein M2 represents the number of ports of the terminal receiving the second reference signal, and N2 represents the number of ports corresponding to the second reference signal.

6. The method according to claim 5, characterized in that The second association relationship includes that M1 is the same as M2.

7. The method according to claim 5 or 6, characterized in that: The second association relationship includes that N2 is smaller than N1.

8. The method according to any one of claims 1 to 7, characterized in that: A difference between a time point at which the first reference signal is received and a time point at which the second reference signal is received is smaller than a preset duration threshold.

9. The method according to any one of claims 1 to 8, characterized in that: A clipping coefficient corresponding to the first reference signal is different from a clipping coefficient corresponding to the second reference signal.

10. The method according to any one of claims 1 to 9, characterized in that: The error vector magnitude (EVM) corresponding to the first reference signal is less than a first EVM threshold; and / or, The EVM corresponding to the second reference signal is less than a second EVM threshold.

11. The method according to claim 10, characterized in that The first EVM threshold is less than the second EVM threshold.

12. The method according to any one of claims 1 to 11, characterized in that: The first reference signal is a channel state information reference signal CSI-RS, and the second reference signal is a demodulation reference signal DMRS.

13. A communication method, characterized in that: include: Sending a first reference signal, where the first reference signal is used for channel measurement; A second reference signal is sent, wherein the second reference signal and the first reference signal are different reference signals, and there is a first correlation relationship between the first reference signal and the second reference signal.

14. The method according to claim 13, characterized in that There is a first association relationship between the first reference signal and the second reference signal, including: there is a second association relationship between first channel state information and second channel state information, wherein the first channel state information is obtained by measuring the first reference signal by the terminal, and the second channel state information is obtained by measuring the second reference signal by the terminal.

15. The method according to claim 14, characterized in that The second association relationship is a mapping relationship.

16. The method according to claim 14 or 15, characterized in that The second association relationship is achieved in the following manner: The first channel state information and the second channel state information are mapped to each other through a preset mapping matrix.

17. The method according to claim 14, characterized in that The first channel state information is a channel matrix of M1*N1 dimension, wherein M1 represents the number of ports of the terminal receiving the first reference signal, and N1 represents the number of ports corresponding to the first reference signal; The second channel state information is a channel matrix of M2*N2 dimension, wherein M2 represents the number of ports of the terminal receiving the second reference signal, and N2 represents the number of ports corresponding to the second reference signal.

18. The method according to claim 17, characterized in that The second association relationship includes that M1 is the same as M2.

19. The method according to claim 17 or 18, characterized in that The second association relationship includes that N2 is smaller than N1.

20. The method according to any one of claims 13 to 19, characterized in that: A difference between a time point at which the first reference signal is sent and a time point at which the second reference signal is sent is smaller than a preset duration threshold.

21. The method according to any one of claims 13 to 20, characterized in that: A clipping coefficient corresponding to the first reference signal is different from a clipping coefficient corresponding to the second reference signal.

22. The method according to any one of claims 13 to 21, characterized in that: The error vector magnitude (EVM) corresponding to the first reference signal is less than a first EVM threshold; and / or, The EVM corresponding to the second reference signal is less than a second EVM threshold.

23. The method according to claim 22, characterized in that The first EVM threshold is less than the second EVM threshold.

24. The method according to any one of claims 13 to 23, characterized in that: The first reference signal is a channel state information reference signal CSI-RS, and the second reference signal is a demodulation reference signal DMRS.

25. A communication device, characterized in that: include: Processing module and communication module; The communication module is used to receive and / or send signals, the processing module is configured to enable the method of any one of claims 1 to 12 to be executed, or the processing module is configured to enable the method of any one of claims 13 to 24 to be executed.

26. A communication device, characterized in that: include: At least one processor and a communication interface, the communication interface being used to receive and / or send signals, the processor being configured to enable the method of any one of claims 1 to 12 to be executed, or the processor being configured to enable the method of any one of claims 13 to 24 to be executed.

27. A communication system, characterized in that: The system comprises: a terminal for executing the method according to any one of claims 1 to 12, and a network device for executing the method according to any one of claims 13 to 24.

28. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores instructions or programs, and when the instructions or programs are executed on the communication device, the communication device executes the method according to any one of claims 1 to 12, or the communication device executes the method according to any one of claims 13 to 24.

29. A computer program product, characterized in that The computer program product comprises a computer program or instructions, and when the computer program or instructions are run on a computer, the computer is caused to execute the method according to any one of claims 1 to 12, or the computer is caused to execute the method according to any one of claims 13 to 24.

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