Communication method and device

Abstract

The invention provides a communication method and device, and relates to the technical field of wireless communication. According to the method, a first communication device can receive a first reference signal through a first port and obtain first information according to the first reference signal, and the first communication device can send a second reference signal through a second port, and the second reference signal can be used for channel estimation of a second communication device receiving the second reference signal. Therefore, second channel information is obtained. Wherein the first communication device can also send first information to the second communication device, so that the second communication device can perform joint channel estimation according to the first information and the second channel information. Therefore, the joint channel estimation is carried out according to the uplink channel estimation result and the downlink channel estimation result, and the channel estimation performance can be improved.

Description

Technical Field

[0001] The present application relates to the field of mobile communication technology, and in particular to a communication method and device. Background Art

[0002] In long term evolution (LTE) communications and new RAT (NR) communications, multiple input and multiple output (MIMO) technology is widely used. In order to better achieve the performance of MIMO, the base station needs to obtain an accurate downlink channel and use the channel to calculate the precoding vector from the base station to the terminal, which greatly affects the performance of the system.

[0003] For time division duplex (TDD) systems, since both uplink and downlink are in the same frequency band, the uplink and downlink of the wireless channel are reciprocal (i.e., the uplink channel and the downlink channel are considered to be the same). The base station receives the sounding reference signal (SRS) sent by the UE, and uses the pilot signal to estimate the uplink channel to obtain the uplink CSI, which is equivalent to obtaining the downlink CSI based on the uplink and downlink reciprocity. The base station uses this information to calculate the precoding to improve the signal transmission quality or rate.

[0004] However, the estimation accuracy of channel estimation performed only based on uplink channel information or downlink channel information needs to be improved. Summary of the invention

[0005] The present application provides a communication method and device for improving the accuracy of channel estimation.

[0006] In a first aspect, a communication method is provided. The method may be implemented by a first communication device. The first terminal device may be a terminal device or a component of a terminal device, or may be a network device or a component in a network device. Among them, the components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as the first communication device as an example, the method may be implemented by the following steps: the first communication device receives a first reference signal through a first port, and sends a second reference signal through a second port associated with the first port; the first communication device sends first information, and the first information is obtained based on the first channel information. Among them, the first channel information is obtained based on the first reference signal. The first information and the second channel information are used for channel estimation, and the second channel information is obtained based on the second reference signal.

[0007] Based on the first aspect, the first communication device can receive the first reference signal through the first port and obtain the first information according to the first reference signal, and the first communication device can send the second reference signal through the second port, wherein the second reference signal can be used for the second communication device receiving the second reference signal to perform channel estimation, thereby obtaining the second channel information. The first communication device can also send the first information to the second communication device, so that the second communication device can perform joint channel estimation according to the first information and the second channel information. The joint channel estimation is performed based on the uplink channel estimation result and the downlink channel estimation result, which can improve the accuracy of the channel estimation.

[0008] In a possible implementation manner, the first communication device may also be used to receive second information, where the second information is used to indicate: the first information is used to indicate an amplitude and / or phase of at least one combining coefficient in the first matrix.

[0009] Based on this implementation, the first communication device may obtain a configuration according to the second information, and determine, according to the configuration, whether the first information fed back is the amplitude, phase, or amplitude and phase of the combining coefficient.

[0010] In a possible implementation, the first communication device may also be used to send confidence information, the confidence information including the signal to noise ratio corresponding to the at least one combining coefficient, the signal received power corresponding to the at least one combining coefficient, the signal to noise ratio corresponding to all combining coefficients corresponding to the first port, the signal received power corresponding to all combining coefficients corresponding to the first port, the signal to noise ratio of all combining coefficients of the first matrix, the signal received power of all combining coefficients of the first matrix, the signal received power corresponding to all combining coefficients of multiple ports in the first port set, and the signal to noise ratio corresponding to all combining coefficients of multiple ports in the first port set. Among them, the multiple ports in the first port set include the first port, and the multiple ports in the first port set all correspond to the first reference signal. Optionally, the first port set may be a set of multiple (partial or all) sending ports of the first communication device.

[0011] Based on this implementation, the confidence information may represent the confidence of the first information. For example, when the confidence information satisfies the confidence condition, the second communication device may perform channel estimation based on the first information and the second channel information. In addition, when the confidence information does not meet the confidence condition, the second communication device may discard the first information, or in other words, not perform channel estimation based on the first information and the second channel information, to ensure that the first information is positively helpful in improving the accuracy of channel estimation, thereby improving the accuracy of channel estimation.

[0012] In a possible implementation manner, the first communication device may also be used to receive third information, where the third information is used to indicate the sending of the confidence information.

[0013] In a possible implementation manner, the first communication device may also be configured to receive indication information of the first threshold; and / or receive indication information of the second threshold.

[0014] Based on this implementation, the first communication device may receive indication information of the first threshold and / or indication information of the second threshold, and thus the first communication device may be informed of the first threshold and / or the second threshold through signaling configuration.

[0015] In a possible implementation, the first communication device may also be used to receive fourth information, where the fourth information is used to indicate a spatial domain vector and a frequency domain vector corresponding to the at least one combining coefficient, that is, to indicate a position or a Doppler frequency shift of the combining coefficient.

[0016] Based on this implementation method, the first communication device can receive fourth information for indicating the position of at least one combining coefficient, so that the first communication device can be informed of the position of at least one combining coefficient that needs to be fed back through signaling indication to improve feedback accuracy, thereby improving channel estimation accuracy.

[0017] In a possible implementation, the first communication device can also be used to receive fifth information, which is used to indicate a first frame structure and a second frame structure, wherein the first frame structure and the second frame structure both include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, and each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain; a subframe in the first frame structure and a subframe in the second frame structure corresponding to the same time domain unit satisfy: at least one subframe is a special subframe; or, one subframe is an uplink subframe and the other subframe is a downlink subframe.

[0018] Based on this implementation, the first communication device may also receive fifth information indicating a complementary frame structure, and receive a first reference signal and a second reference signal based on the complementary frame structure. The complementary frame structure helps to reduce channel estimation delay and improve channel estimation accuracy.

[0019] In a second aspect, a communication method is provided. The method may be implemented by a second communication device. The second communication device may be a network device, a component in a network device, a terminal device, or a component in a terminal device. Among them, the components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as the second communication device as an example, the method can be implemented by the following steps: the second communication device sends a first reference signal, and receives a second reference signal, the first reference signal is received by the first port of the first communication device, the second reference signal is sent by the second port of the first communication device, and the first port is associated with the second port. The second communication device may also receive the first information, and perform channel estimation based on the first information and the second channel information. Among them, the first information is obtained based on the first channel information, the first channel information is obtained based on the first reference signal, and the second channel information is obtained based on the second reference signal.

[0020] In a possible implementation manner, the second communication device may also send second information, where the second information is used to indicate that the first information is used to indicate an amplitude and / or phase of at least one combining coefficient in the first matrix.

[0021] In a possible implementation manner, the second communication device may also receive confidence information. The confidence information may refer to the description of the first aspect.

[0022] In a possible implementation manner, the second communication device may further send third information, where the third information is used to indicate the sending of the confidence information.

[0023] In a possible implementation manner, the second communication device may also send indication information of the first threshold and / or indication information of the second threshold.

[0024] In a possible implementation, the second communication device may also send fourth information, where the first indication information is used to indicate a spatial domain vector and a frequency domain vector corresponding to the at least one combining coefficient.

[0025] In a possible implementation, the second communication device may also send fifth information, which is used to indicate the first frame structure and the second frame structure, wherein the first frame structure and the second frame structure each include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain. Among them, a subframe in the first frame structure corresponding to the same time domain unit and a subframe in the second frame structure satisfy: at least one subframe is a special subframe; or, one subframe is an uplink subframe and the other subframe is a downlink subframe.

[0026] The beneficial effects of the method shown in the second aspect above can refer to the description of the beneficial effects of the first aspect.

[0027] In any possible implementation manner of the first aspect and the second aspect, the association between the first port and the second port may mean that the first port and the second port correspond to the same physical port or logical port.

[0028] In any possible implementation of the first aspect and the second aspect, the first port is used to receive an uplink reference signal, and the second port is used to send a downlink reference signal; or, the first port is used to receive a downlink reference signal, and the second port is used to send an uplink reference signal.

[0029] Based on this implementation method, when the first port is used to receive an uplink reference signal and the second port is used to send a downlink reference signal, the first communication device may be a network device and the second communication device may be a terminal device; when the first port is used to receive a downlink reference signal and the second port is used to send an uplink reference signal, the first communication device may be a terminal device and the second communication device may be a network device, so joint channel estimation can be implemented in uplink or downlink communication scenarios.

[0030] In any possible implementation of the first aspect and the second aspect, the first channel information includes at least one first matrix, the first matrix corresponds to at least one spatial domain vector and multiple frequency domain vectors, the first matrix includes multiple combining coefficients, each combining coefficient is a combining coefficient of a spatial domain vector and a frequency domain vector, and the first information is used to indicate the amplitude and / or phase of at least one combining coefficient in the first matrix.

[0031] Based on this implementation method, the first information can be used to indicate at least one combining coefficient, so that the second communication device can perform joint channel estimation on the position (or Doppler frequency shift) of at least one combining coefficient based on the at least one combining coefficient to improve the channel estimation accuracy of the position of at least one combining coefficient.

[0032] In any possible implementation of the first aspect and the second aspect, the first information includes the amplitude and / or phase of the at least one combining coefficient normalized according to the maximum amplitude combining coefficient. That is, the first information includes the amplitude and / or phase of the normalized combining coefficient. The combining coefficient with the maximum amplitude includes the combining coefficient with the maximum amplitude among all the combining coefficients corresponding to the first port, that is, the combining coefficient with the maximum amplitude at the port level; or, the combining coefficient with the maximum amplitude includes the combining coefficient with the maximum amplitude among all the combining coefficients of the first matrix, that is, the combining coefficient with the maximum amplitude at the matrix level; or, the combining coefficient with the maximum amplitude includes the combining coefficient with the maximum amplitude among the at least one combining coefficient, that is, the combining coefficient with the maximum amplitude at the first information level; or, the combining coefficient with the maximum amplitude includes the combining coefficient with the maximum amplitude among all the combining coefficients corresponding to multiple ports in the first port set, that is, the combining coefficient with the maximum amplitude at the device level, wherein the multiple ports in the first port set include the first port, and the multiple ports in the first port set all correspond to the first reference signal. For example, one combining coefficient in at least one combining coefficient is expressed as ae jθ , a is the amplitude of the combining coefficient, θ is the phase of the combining coefficient, the amplitude of the maximum combining coefficient is b, then the normalized combining coefficient is expressed as (a / b)e jθ , (a / b) is the amplitude of the normalized combining coefficient, and θ is the phase of the normalized combining coefficient.

[0033] Based on the implementation, the first information may include the amplitude of at least one combining coefficient normalized according to the amplitude of the maximum combining coefficient to reduce the feedback overhead. In addition, the maximum combining coefficient may be a maximum combining coefficient at the port level, the matrix level, the first information level, or the device level, thereby improving the flexibility of the normalization scheme.

[0034] In any possible implementation of the first aspect and the second aspect, the signal to interference noise ratio corresponding to the at least one combining coefficient is greater than or equal to the first threshold, or greater than or equal to the first threshold and less than or equal to the second threshold, or less than or equal to the second threshold; or the signal receiving power corresponding to the at least one combining coefficient is greater than or equal to the first threshold, or greater than or equal to the first threshold and less than or equal to the second threshold, or less than or equal to the second threshold. The first threshold and the second threshold are respectively the signal to noise ratio thresholds corresponding to the combining coefficient, and are used by the first communication device to determine the combining coefficient that meets the signal to noise ratio threshold condition as the at least one combining coefficient indicated by the first information, so as to improve the feedback accuracy, thereby improving the channel estimation accuracy.

[0035] In any possible implementation of the first aspect and the second aspect, the first frequency domain resource and the second frequency domain resource correspond to different carriers, or the first frequency domain resource and the second frequency domain resource correspond to different subbands in the same carrier, so as to realize complementary frame structures in different communication systems.

[0036] In any possible implementation of the first aspect and the second aspect, the first port and the second port correspond to different subframes on the first frequency domain resource, or the first port and the second port correspond to different subframes on the second frequency domain resource. Therefore, the joint channel estimation method shown in the present application can be applied in the complementary frame structure, which helps to reduce the channel estimation delay and improve the channel estimation accuracy.

[0037] In a third aspect, a communication method is provided. The method may be implemented by a first communication device. The first terminal device may be a terminal device or a component of a terminal device. Among them, the components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as the first communication device as an example, the method may be implemented by the following steps: the first communication device receives fifth information, and the fifth information is used to indicate a first frame structure and a second frame structure, wherein the first frame structure and the second frame structure both include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, and each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain; a subframe in the first frame structure corresponding to the same time domain unit and a subframe in the second frame structure satisfy: at least one subframe is a special subframe; or, one subframe is an uplink subframe and the other subframe is a downlink subframe.

[0038] The complementary frame structure helps to reduce the transmission delay of feedback information, and can ensure that the data or information can be transmitted uplink or downlink in the current or next subframe.

[0039] In a fourth aspect, a communication method is provided. The method may be implemented by a second communication device. The second communication device may be a network device, a component in a network device, a terminal device, or a component in a terminal device. Among them, the components in the present application may include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as the second communication device as an example, the method can be implemented by the following steps: the second communication device sends fifth information, and the fifth information is used to indicate a first frame structure and a second frame structure, wherein the first frame structure and the second frame structure can refer to the description of the third aspect.

[0040] In a possible implementation of the third aspect or the fourth aspect, the first frequency domain resources and the second frequency domain resources correspond to different carriers, or the first frequency domain resources and the second frequency domain resources correspond to different subbands in the same carrier.

[0041] The beneficial effects of the third aspect or the fourth aspect and their possible implementation methods can be found in the description of the beneficial effects of the corresponding implementation methods of the first aspect, and will not be repeated here.

[0042] In a fifth aspect, a communication device is provided. The device can implement the method described in any one or more aspects of the first to fourth aspects and any possible design thereof. The device has the functions of the first communication device and / or the second communication device. The device is, for example, a terminal device, or a functional module in a terminal device, or a network device or a functional module in a network device, etc.

[0043] In an optional implementation, the device may include a module corresponding to the method / operation / step / action described in any one or more aspects of the first to fourth aspects, and the module may be a hardware circuit, or software, or a hardware circuit combined with software. In an optional implementation, the device includes a processing unit (sometimes also referred to as a processing module) and a communication unit (sometimes also referred to as a transceiver module, a communication module, etc.). The transceiver unit can implement a sending function and a receiving function. When the transceiver unit implements the sending function, it can be called a sending unit (sometimes also referred to as a sending module), and when the transceiver unit implements the receiving function, it can be called a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit can be the same functional module, which is called a transceiver unit, and the functional module can implement a sending function and a receiving function; or, the sending unit and the receiving unit can be different functional modules, and the transceiver unit is a general term for these functional modules.

[0044] Exemplarily, when the device is used to execute the method described in any one or more aspects of the first to fourth aspects and their possible implementations, the device may include a communication unit and a processing unit.

[0045] In the sixth aspect, an embodiment of the present application also provides a communication device, comprising a processor for executing a computer program (or computer executable instructions) stored in a memory, so that when the computer program (or computer executable instructions) is executed, the device executes a method as in any one or more aspects of the first to fourth aspects and their various possible implementations.

[0046] In one possible implementation, the processor and the memory are integrated together;

[0047] In another possible implementation, the memory is located outside the communication device.

[0048] The communication device also includes a communication interface, which is used for the communication device to communicate with other devices, such as sending or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface.

[0049] In the seventh aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store computer programs or instructions, which, when executed, enables the method shown in any one or more aspects of the first to fourth aspects and any possible implementation thereof to be implemented.

[0050] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the method shown in any one or more aspects from the first to the fourth aspects and any possible implementation thereof to be implemented.

[0051] In a ninth aspect, an embodiment of the present application also provides a communication device for executing methods in any one or more of the first to fourth aspects above and their various possible implementations.

[0052] In the tenth aspect, a chip system is provided, which includes a logic circuit (or understood as, the chip system includes a processor, the processor may include a logic circuit, etc.), and may also include an input and output interface. The input and output interface can be used to input messages, and may also be used to output messages. The input and output interfaces may be the same interface, that is, the same interface can realize both the sending function and the receiving function; or, the input and output interface includes an input interface and an output interface, the input interface is used to realize the receiving function, that is, for receiving messages; the output interface is used to realize the sending function, that is, for sending messages. The logic circuit can be used to perform operations other than the sending and receiving functions in the method shown in any one or more aspects of the first to fourth aspects and any possible implementation thereof; the logic circuit can also be used to transmit messages to the input and output interface, or to receive messages from other communication devices from the input and output interface. The chip system can be used to implement the method shown in any one or more aspects of the first to fourth aspects and any possible implementation thereof. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0053] Optionally, the chip system may further include a memory, which may be used to store instructions, and the logic circuit may call the instructions stored in the memory to implement corresponding functions.

[0054] In the eleventh aspect, a communication system is provided, which may include a first communication device and a second communication device, the first communication device can be used to implement the method shown in the first aspect or the third aspect and any possible implementation thereof, and the second communication device can be used to implement the method shown in the second aspect or the fourth aspect and any possible implementation thereof.

[0055] The technical effects brought about by the above-mentioned second to eleventh aspects can be found in the description of the above-mentioned first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0057] Figure 2 A schematic diagram of the location of the PMI feedback merging coefficient provided in an embodiment of the present application;

[0058] Figure 3 A flow chart of a communication method provided in an embodiment of the present application;

[0059] Figure 4 A schematic diagram of the position of a feedback combining coefficient provided in an embodiment of the present application;

[0060] FIG5( a ) is a schematic diagram of the position of a feedback combining coefficient provided in an embodiment of the present application;

[0061] FIG5( b ) is a schematic diagram of the position of another feedback combining coefficient provided in an embodiment of the present application;

[0062] FIG5( c ) is a schematic diagram of the position of another feedback combining coefficient provided in an embodiment of the present application;

[0063] FIG5( d ) is a schematic diagram of the position of another feedback combining coefficient provided in an embodiment of the present application;

[0064] FIG5( e ) is a schematic diagram of the position of another feedback combining coefficient provided in an embodiment of the present application;

[0065] FIG5( f ) is a schematic diagram of the position of another feedback combining coefficient provided in an embodiment of the present application;

[0066] FIG5( g) is a schematic diagram of the position of another feedback combining coefficient provided in an embodiment of the present application;

[0067] Figure 6 A schematic diagram of a joint channel estimation method provided in an embodiment of the present application;

[0068] Figure 7 A schematic diagram of a complementary frame structure provided in an embodiment of the present application;

[0069] Figure 8 A schematic diagram of another complementary frame structure provided in an embodiment of the present application;

[0070] Fig. 9 A schematic diagram of another complementary frame structure provided in an embodiment of the present application;

[0071] Fig.10 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0072] Fig.11 A schematic diagram of the structure of another communication device provided in an embodiment of the present application;

[0073] Fig.12 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] The embodiment of the present application provides a communication method and device. The method and device are based on the same inventive concept. Since the method and device solve the problem in a similar principle, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0075] In the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. It should be noted that the order of appearance of first, second, etc. is not limited in this application. For example, the second may appear first and then the first, and this application does not limit this.

[0076] In the description of this application, "at least one (kind)" refers to one (kind) or more (kinds), and more (kinds) refers to two (kinds) or more than two (kinds). "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 represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple. In the description of this application, " / " means "or", for example, a / b means a or b.

[0077] Figure 1 FIG. 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. Figure 1 As shown, the communication system includes an access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The radio access network (RAN) 100 may include at least one RAN node (eg, Figure 1 110a and 110b), and may further include at least one terminal (such as Figure 1 120a-120j in the figure). The terminal is connected to the wireless access network device by wireless means, and the wireless access network device is connected to the core network by wireless or wired means. The core network device and the wireless access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated on the same physical device, or part of the functions of the core network device and part of the functions of the wireless access network device can be integrated on one physical device. Terminals and wireless access network devices can be connected to each other by wired or wireless means. Figure 1 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 Not drawn in.

[0078] A network device is a network-side device with wireless transceiver functions. A network device may be a device in a radio access network (RAN) that provides wireless communication functions for terminal devices, and is called a RAN device. RAN may be an access network in the 3rd Generation Partnership Project (3GPP), such as 4G, 5G, or future-oriented 6G networks. RAN may also be an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or a communication network of two or more of the above networks. RAN equipment can be a base station in LTE or LTE advanced (LTE-A) communication system, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation nodeB (gNB) in the fifth generation (5G) mobile communication system, a next generation base station in the sixth generation (6G) mobile communication system, a base station in a future mobile communication system, a wireless fidelity (WiFi) system, a long range radio (LoRa) system or an access node in a vehicle networking system. RAN equipment can also be a module or unit that completes some functions of a base station, for example, a centralized unit (CU), a distributed unit (DU), or a radio unit (RU). The CU here completes the functions of the radio resource control protocol and packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and medium access control (MAC) layer of the base station, and can also complete the functions of part or all of the physical layer. For the specific description of the above-mentioned protocol layers, please refer to the relevant technical specifications of the 3rd generation partnership project (3GPP).CU and DU may be separately configured, or may be included in the same network element, such as a baseband unit (BBU). RU may be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). In different systems, CU, DU, or RU may also have different names, but those skilled in the art may understand their meanings. For example, in an ORAN system, CU may also be referred to as O-CU (open CU), DU may also be referred to as O-DU, and RU may also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU, and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. The wireless access network device may be a macro base station (eg. Figure 1 110a), or a micro base station or an indoor station (such as Figure 1 110b), may also be a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For ease of description, network device is used as the abbreviation of wireless access network device, and base station is used as an example of wireless access network device.

[0079] The terminal device is a device with wireless transceiver function, which can send signals to the base station or receive signals from the base station. The terminal device can also be called a terminal, user equipment (UE), mobile station, mobile terminal, etc. The terminal device can be widely used in various scenarios, for example, device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, automatic driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0080] In this application, the network equipment and terminal equipment can be fixed or movable. The network equipment and terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of network equipment and terminal equipment.

[0081] The roles of network devices and terminal devices can be relative, for example, Figure 1 The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal 120j that accesses the wireless access network 100 through 120i, the terminal 120i is a network device; but for the base station 110a, 120i is a terminal device, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between network devices. In this case, relative to 110a, 120i is also a network device. Therefore, network devices and terminal devices can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure may be referred to as communication devices having network device functions. Figure 1 120a-120j in the figure can be called communication devices with terminal equipment functions.

[0082] Network devices and terminal devices, network devices and network devices, and terminal devices and terminal devices can communicate through authorized spectrum, unauthorized spectrum, or both; can communicate 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.

[0083] In the embodiments of the present application, the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem including the network device function. The control subsystem including the network device function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device including the terminal device function.

[0084] In this application, the network device sends a downlink signal or downlink information to the terminal device, and the downlink information is carried on the downlink channel; the terminal device sends an uplink signal or uplink information to the network device, and the uplink information is carried on the uplink channel. In order to communicate with the network device, the terminal device needs to establish a wireless connection with the cell controlled by the network device. The cell with which the terminal device has established a wireless connection is called the service cell of the terminal device. When the terminal device communicates with the service cell, it will also be interfered by signals from neighboring cells.

[0085] The following is an introduction to the technical terms involved in this application.

[0086] 1. Antenna port:

[0087] The antenna port can be referred to as a port for short. It can be understood as a transmitting antenna recognized by the receiving device, or a transmitting antenna that can be distinguished in space. An antenna port can be preconfigured for each virtual antenna, and each virtual antenna can be a weighted combination of multiple physical antennas. Each antenna port can correspond to a reference signal. Therefore, each antenna port can be called a reference signal port, for example, a sounding reference signal (SRS) port, etc. In an embodiment of the present application, the reference signal can be a non-precoded reference signal or a precoded reference signal, and the present application does not limit this. When the reference signal is a precoded reference signal, the reference signal port can be a transmitting antenna port. The transmitting antenna port can refer to an independent transceiver unit (transceiverunit, TxRU).

[0088] 2. Spatial domain vector:

[0089] A spatial vector may also be called a spatial component vector, a beam vector, a spatial beam basis vector, a spatial basis vector, etc. A spatial vector may correspond to a beam or a beam direction. A spatial vector may be one of the vectors used to construct a channel matrix. Each element in a spatial vector may represent the weight of each antenna port. Based on the weights of each antenna port represented by each element in the spatial vector, the signals of each antenna port are linearly superimposed to form an area with a strong signal in a certain direction of space.

[0090] For the convenience of explanation, it is assumed that the spatial vector is denoted as u. The length of the spatial vector u can be the number of transmitting antenna ports N in a polarization direction. s , N s ≥1 and is an integer. The spatial vector can be, for example, of length N sThe present application does not limit this.

[0091] In one implementation, the spatial domain vector is a discrete Fourier transform (DFT) vector. The DFT vector may refer to a vector in a DFT matrix.

[0092] In one implementation, the spatial domain vector is a conjugate transposed vector of the DFT vector. The DFT conjugate transposed vector may refer to a column vector in a conjugate transposed matrix of the DFT matrix.

[0093] In one implementation, the spatial domain vector is an oversampled DFT vector. The oversampled DFT vector may refer to a vector in an oversampled DFT matrix.

[0094] In one implementation, the spatial domain vector may be, for example, a two-dimensional (2D)-DFT vector v defined in a type II codebook in NR protocol 38.214 release 15 (R15). l,m In other words, the spatial domain vector may be a 2D-DFT vector or an oversampled 2D-DFT vector. For the sake of brevity, a detailed description of the 2D-DFT vector is omitted here.

[0095] 3. Frequency domain vector:

[0096] Frequency domain vectors can also be called frequency domain component vectors, frequency domain basis vectors, frequency domain basis, etc., which can be used to represent the vectors of the channel's changing pattern in the frequency domain. A frequency domain vector can correspond to a delay path or a delay domain path. Each frequency domain vector can represent a changing pattern. As the signal is transmitted through a wireless channel, it can reach the receiving antenna from the transmitting antenna through multiple paths. Multipath delay causes frequency selective fading, which is the change of the frequency domain channel. Therefore, different frequency domain vectors can be used to represent the changing pattern of the channel in the frequency domain caused by delays on different transmission paths.

[0097] Frequency domain vector u f The length can be recorded as N f , N f is a positive integer, and the frequency domain vector can be, for example, of length N fA column vector or row vector of a frequency domain vector. The length of the frequency domain vector can be determined by the number of frequency domain units to be reported preconfigured in the reporting bandwidth, or by the length of the reporting bandwidth, or can be a predefined value. This application does not limit the length of the frequency domain vector. Among them, the reporting bandwidth may, for example, refer to the CSI reporting bandwidth (csi-ReportingBand) carried in the CSI reporting preconfiguration in the high-level signaling (such as the radio resource control (RRC) message). In this application, predefined may refer to pre-configuration or storage in the device, or may be predefined by the protocol.

[0098] For example, the frequency domain vector or frequency domain basis can be a DFT basis related to at least one of the bandwidth of the downlink reference signal and the frequency domain granularity size of the downlink reference signal, or a delay value basis based on M bits of quantization, or a basis based on cyclic shift. Each of the delay value basis of the M bits of quantized delay value basis corresponds to a delay path or a delay domain path, such as 10ns, which can be quantized into an M-bit delay value, i.e., a delay value basis, by predefinition or notification of the network device to the terminal device, or the terminal device notifies the network device. The basis based on cyclic shift can be a basis composed of N cyclic shift sequences, each basis is a cyclic shift sequence, and each cyclic shift sequence corresponds to a cyclic shift mode of a delay path or a frequency domain basis.

[0099] After the frequency domain basis or frequency domain vector is determined, the indexes corresponding to all frequency domain basis can be determined, each frequency domain basis corresponds to an index, and each index can be used to determine a frequency domain basis. For example, when there are a total of N frequency domain basis, one possible way is to index the frequency domain basis from 1 to N; another possible way is to use the value of the frequency domain basis as an index, for example, when the frequency domain basis is a delay value basis, the index of the frequency domain basis corresponding to 10ns can be 10.

[0100] 4. Doppler shift and time domain vector:

[0101] Doppler shift can also be called Doppler frequency shift, which indicates the shift of frequency due to the movement of terminal equipment or network equipment or other factors. Doppler shift can indicate the magnitude of frequency shift, or it can indicate a channel time domain change rule. When the signal is transmitted through the wireless channel at different times, the multipath and the mobility of the transmitter or receiver cause time selective fading, which is the change of the time domain channel. Each delay path of the channel may experience different mobile environments, so each delay path or frequency domain basis will correspond to one or more Doppler shifts, and the correspondence indicates that the energy or amplitude of the coefficient corresponding to the Doppler shift on the delay path or frequency domain basis is greater than 0, indicating the specific time domain channel change experienced by the delay path. Correspondingly, the Doppler shift can also be said to be associated with the delay path or frequency domain basis. A delay path or frequency domain basis and a Doppler shift corresponding to it, or a Doppler shift and a delay path or frequency domain basis associated with it, constitute a Doppler shift and frequency domain basis pair. The frequency domain basis pair also corresponds to the coefficient. In the present application, the energy of the combining coefficient may be the amplitude of the combining coefficient or the square of the amplitude, or in other words, the energy of the combining coefficient may be the modulus of the amplitude of the combining coefficient or the square of the modulus.

[0102] The time domain vector can also be called the time domain component vector, the time domain basis vector, the Doppler domain basis, etc. It can be used to represent the vector of the change law of the channel in the time domain. A time domain vector or a Doppler basis can correspond to a Doppler path or a Doppler shift. Each time domain vector can represent a change law. When the signal is transmitted through the wireless channel at different times, the multipath and the mobility of the transmitter or receiver cause time selective fading, which is the change of the time domain channel. Therefore, different time domain vectors can be used to represent the change law of the channel in the time domain.

[0103] Time domain vector u t The length can be recorded as N t , N t is a positive integer, and the time domain vector can be, for example, of length N t The length of the time domain vector can be determined by the number of joint observation moments. For example, if we focus on the measurement results of S CSI-RS, then N t =S; the time domain vector can be the DFT basis.

[0104] For example, the time domain vector or Doppler basis can be a DFT basis related to at least one of the number of downlink reference signals and the time interval of the downlink reference signals, or a Doppler value basis based on P-bit quantization, or a basis based on cyclic shift. Each Doppler value basis in the P-bit quantized Doppler value basis corresponds to a Doppler shift, such as 20Hz, which can be quantized into a P-bit Doppler shift, i.e., a Doppler value basis, by predefinition or by notification of the network device to the terminal device, or by notification of the terminal device to the network device. The basis based on cyclic shift can be a basis composed of Q cyclic shift sequences, each basis being a cyclic shift sequence, and each cyclic shift sequence corresponding to a Doppler shift or time domain vector cyclic shift mode.

[0105] After the Doppler basis or time domain vector is determined, the indexes corresponding to all Doppler basis can be determined, each Doppler basis corresponds to an index, and each index can be used to determine a Doppler basis, and then determine its corresponding Doppler shift. For example, when there are a total of Q Doppler basis, one possible way is to number the Doppler basis from 1 to Q as an index; one possible way is to use the value of the Doppler shift corresponding to the Doppler basis as an index, for example, when the Doppler basis is a Doppler value basis, the index of the Doppler basis corresponding to 20Hz can be 20.

[0106] 5. Space-frequency vector pair:

[0107] A space-frequency vector pair can also be called a space-frequency component vector. A space-domain vector and a frequency-domain vector can be combined to obtain a space-frequency vector pair. In other words, a space-frequency vector pair can include a space-domain vector and a frequency-domain vector. A space-frequency component matrix can be obtained by the space-domain vector and the frequency-domain vector in a space-frequency vector pair. For example, a space-frequency component matrix can be obtained by multiplying a space-domain vector with the conjugate transpose of a frequency-domain vector. The space-frequency component matrix described here is relative to the space-frequency matrix described below. Since a space-frequency matrix can be obtained by weighted summation of multiple space-frequency component matrices, each item used for weighting can be called a component of a space-frequency matrix, i.e., the space-frequency component matrix mentioned here.

[0108] 6. Space-frequency-time vector group:

[0109] The space-frequency-time vector group can also be called the space-frequency-time component vector. A space-domain vector, a frequency-domain vector and a time-domain vector can be combined to obtain a space-frequency-time vector group. In other words, a space-frequency-time vector group can include a space-domain vector, a frequency-domain vector and a time-domain vector. A space-frequency-time component three-dimensional matrix can be obtained by the space-domain vector, the frequency-domain vector and the time-domain vector in a space-frequency-time vector group. For example, a space-frequency-time component three-dimensional matrix can be obtained by performing tensor product multiplication on a space-domain vector, a frequency-domain vector and a time-domain vector. The space-frequency-time component three-dimensional matrix described here is relative to the space-frequency-time three-dimensional matrix described below. Since the space-frequency-time three-dimensional matrix can be obtained by weighted summation of multiple space-frequency-time component three-dimensional matrices, each item used for weighting can be called a component of a space-frequency-time three-dimensional matrix, that is, the space-frequency-time component three-dimensional matrix mentioned here.

[0110] 7. Space-frequency matrix:

[0111] In the embodiment of the present application, the space-frequency matrix can be understood as an intermediate quantity used to determine the channel matrix corresponding to each frequency domain unit. For a terminal device, the space-frequency matrix can be determined by the channel matrix corresponding to each frequency domain unit. For an access network device, the space-frequency matrix can be obtained by the weighted sum of multiple space-frequency component matrices to restore the channel matrix.

[0112] For example, the space-frequency matrix can be denoted as H, Among them, w0 to Yes and N f The frequency domain unit corresponds to N f column vectors, each of which can be a channel vector or a channel matrix corresponding to each frequency domain unit, and the length of each column vector can be N s The N f The column vectors correspond to N f The channel vector of frequency domain units. That is, the space-frequency matrix can be regarded as N f The joint matrix is ​​composed of the channel vectors corresponding to the frequency domain units.

[0113] In one possible design, the space-frequency matrix may correspond to a receiving antenna port. The space-frequency matrix is ​​said to correspond to a receiving antenna port because the terminal device can feedback a frequency domain vector, a space domain vector, and a combining coefficient based on each receiving antenna port. The space-frequency matrix determined by the access network device based on the feedback of the terminal device is the space-frequency matrix corresponding to the receiving antenna port.

[0114] It should be understood that the space-frequency matrix is ​​a form of expression for determining the channel matrix and should not constitute any limitation to the present application. For example, the column vectors in the space-frequency matrix are connected in order from left to right, or arranged according to other predefined rules, and a length of N can also be obtained. s×N f The vector of , which can be called the space-frequency vector.

[0115] It should also be understood that the dimensions of the space-frequency matrix and the space-frequency vector shown above are only examples and should not constitute any limitation to the present application. f ×N s Wherein, each row vector may correspond to a frequency domain unit, so as to be used to determine the channel vector of the corresponding frequency domain unit.

[0116] In addition, when the transmitting antenna is configured with multiple polarization directions, the dimension of the space-frequency matrix can be further expanded. For example, for a dual-polarization antenna, the dimension of the space-frequency matrix can be 2N s ×N f or N f ×2N s It should be understood that the present application does not limit the number of polarization directions of the transmitting antenna.

[0117] Furthermore, the space-frequency matrix corresponding to a receiving antenna port can also be expressed as

[0118] One or more spatial domain vectors may constitute a matrix W1, and each column vector in W1 corresponds to a spatial domain vector. One or more frequency domain vectors may constitute a matrix W3, and each column vector in W3 corresponds to a frequency domain vector. Represents the merging coefficient matrix.

[0119] When the number of receiving antenna ports is greater than 1, the spatial domain vectors used by each receiving antenna port may not be exactly the same, that is, each receiving antenna port uses an independent spatial domain vector; the spatial domain vectors used by each receiving antenna port may also be the same, that is, multiple receiving antenna ports share L spatial domain vectors.

[0120] When the number of receiving antenna ports is greater than 1, the frequency domain vectors used by each receiving antenna port may not be exactly the same, that is, each receiving antenna port uses an independent frequency domain vector; the frequency domain vectors used by each receiving antenna port may also be the same, that is, multiple receiving antenna ports share M frequency domain vectors.

[0121] In this case, the channel vector corresponding to each frequency domain unit on the i-th receiving antenna port can be based on the above L spatial domain vectors and M i The frequency domain vector is constructed.

[0122] If a dual-polarization transmitting antenna is used, L spatial vectors can be selected for each polarization direction. Then, the dimension of W1 can be 2N s×2L. In one possible implementation, the two polarization directions can use the same L spatial vectors At this time, W1 can be expressed as:

[0123]

[0124] in, Represents the i-th spatial domain vector among the selected L spatial domain vectors, i=0, 1,…, L-1.

[0125] For the i-th receive antenna port, W3 H The dimension can be M i ×N f Each column vector in W3 can be a frequency domain vector. At this time, each spatial domain vector in W1 and each frequency domain vector in W3 can form a spatial frequency vector pair, and each spatial frequency vector pair can correspond to a merging coefficient, so there are 2L spatial domain vectors and M i The 2L×M frequency domain vectors are constructed i The space-frequency vector pairs can be combined with 2L×M i The merging coefficients correspond one to one.

[0126] For the i-th receive antenna port, It can be composed of the above 2L×M i The merging coefficient matrix is ​​composed of merging coefficients, and its dimension can be 2L×M i The combined coefficient matrix The lth row in may correspond to the lth spatial vector in the first polarization direction among the 2L spatial vectors. The combined coefficient matrix The L+lth row in may correspond to the lth spatial vector in the second polarization direction among the 2L spatial vectors. The mth (0≤m≤M i -1 and m is an integer) columns can correspond to M i The mth frequency domain vector among the frequency domain vectors.

[0127] The position of the space-frequency vector pair used to construct the space-frequency matrix specifically refers to the position of the space-domain vector used to construct the space-frequency matrix in the space-domain vector reported by the terminal device and the position of the frequency-domain vector used to construct the space-frequency matrix in the frequency-domain vector reported by the terminal device. Since each space-frequency vector corresponds to a non-zero merging coefficient (referred to as a non-zero coefficient), the position of the space-frequency vector pair used to construct the space-frequency matrix is ​​also the position of the non-zero coefficient.

[0128] 8. Space-frequency-time three-dimensional matrix:

[0129] In the embodiment of the present application, the space-frequency-time three-dimensional matrix can be understood as an intermediate quantity used to determine the channel vector or matrix corresponding to each frequency domain unit at a specific moment. For a terminal device, the space-frequency-time three-dimensional matrix can be determined by the channel matrix corresponding to each frequency domain unit obtained by a number of downlink reference signals at different moments. For an access network device, the space-frequency-time three-dimensional matrix can be obtained by the weighted sum of multiple space-frequency-time component three-dimensional matrices to restore the channel matrix.

[0130] In one possible design, the space-frequency-time three-dimensional matrix can correspond to the receiving antenna ports, and each receiving port expands its corresponding space-frequency matrix to N in the time dimension. t In each time dimension, the space-frequency matrix obtained by taking the corresponding downlink reference signal is finally obtained, and the space-frequency three-dimensional matrix is ​​obtained, and its dimension can be N s ×N f ×N t .

[0131] In addition, when the transmitting antenna is configured with multiple polarization directions, the dimension of the space-frequency-time three-dimensional matrix can be further expanded. For example, for a dual-polarization direction antenna, the dimension of the space-frequency-time three-dimensional matrix can be 2N s ×N f ×N t or N f ×2N s ×N t It should be understood that the present application does not limit the number of polarization directions of the transmitting antenna.

[0132] Furthermore, the space-frequency-time three-dimensional matrix corresponding to a receiving antenna port can also be expressed as:

[0133]

[0134] Among them, one or more vectors can constitute a matrix W1, and each column vector in W1 corresponds to a spatial domain vector. One or more frequency domain vectors can constitute a matrix W3, and each column vector in W3 corresponds to a frequency domain vector. One or more time domain vectors can constitute a matrix W4, and each column vector in W4 corresponds to a time domain vector.

[0135] Among them, for the N-dimensional matrix R, the dimensions are I1×I2×...×I N , operation⊙ n , n=1,2,...,N is defined as: for the two-dimensional matrix Q n , with dimensions a×I n , n∈[1, 2, ..., N].

[0136] R new =Q n ⊙ nR, whose dimensions are I1×I2×...×I n-1 ×a×I n+1 ×...×I N .

[0137] in,

[0138] For the i-th receive antenna port, It can be composed of the above 2L×M i ×S merging coefficients form a three-dimensional matrix of merging coefficients, whose dimension can be 2L×M i ×S. The three-dimensional matrix of the combined coefficients The lth first dimension in can correspond to the lth spatial vector in the first polarization direction of the 2L spatial vectors, and the combined coefficient three-dimensional matrix The L+lth first dimension in can correspond to the lth spatial vector in the second polarization direction of the 2L spatial vectors. The three-dimensional matrix of the combined coefficients The mth (0≤m≤M i -1 and m is an integer) the second dimension can correspond to m i The mth frequency domain vector among the frequency domain vectors. The three-dimensional matrix of the combined coefficients The s-th (0≤s≤S-1 and s is an integer) third dimension in can correspond to the s-th time domain vector among the S time domain vectors.

[0139] The position of the space-frequency-time vector group used to construct the space-frequency-time three-dimensional matrix specifically refers to the position of the space-domain vector used to construct the space-frequency-time three-dimensional matrix in the space-domain vector reported by the terminal device, the position of the frequency-domain vector used to construct the space-frequency-time three-dimensional matrix in the frequency-domain vector reported by the terminal device, and the position of the time-domain vector used to construct the space-frequency-time three-dimensional matrix in the frequency-domain vector reported by the terminal device. Since each space-frequency-time vector group corresponds to a non-zero merging coefficient (referred to as a non-zero space-frequency-time coefficient), the position of the space-frequency-time vector group used to construct the space-frequency-time three-dimensional matrix is ​​also the position of the non-zero space-frequency-time coefficient.

[0140] 9. Space-frequency combining coefficient:

[0141] The space-frequency combining coefficient can also be called combining coefficient, weighting coefficient, etc. Each combining coefficient can correspond to a space-domain vector and a frequency-domain vector, or in other words, each combining coefficient can correspond to a space-frequency vector pair. Each combining coefficient is a weighting coefficient of the space-frequency component matrix constructed by the corresponding space-frequency vector pair. A combining coefficient corresponds to a space-domain vector and a frequency-domain vector. Specifically, the combining coefficient matrix The element in the i-th row and j-th column is the combining coefficient corresponding to the space-frequency vector pair composed of the i-th space-domain vector and the j-th frequency-domain vector. For dual-polarized antennas, i∈{1,2,,2L}, the length of each space-domain vector is 2N. s .

[0142] Each combining coefficient includes amplitude and phase. For example, the combining coefficient can be expressed as ae jθ , a is the amplitude of the combining coefficient, and θ is the phase of the combining coefficient. In addition, when the amplitude b is used to normalize the combining coefficient in this application, the normalized combining coefficient can be expressed as (a / b)e jθ , that is, the amplitude of the normalized combining coefficient is (a / b), and the amplitude of the normalized combining coefficient is θ.

[0143] The amplitude value of some merging coefficients may be zero or close to zero, and the corresponding quantization value may be zero. The merging coefficients whose amplitude is quantized by the quantization value zero may be called merging coefficients with zero amplitude. Correspondingly, the amplitude values ​​of some merging coefficients are large, and the corresponding quantization values ​​are not zero. The merging coefficients whose amplitude is quantized by the non-zero quantization value may be called merging coefficients with amplitude greater than zero.

[0144] 10, Space-frequency time combining coefficient:

[0145] The space-frequency-time combining coefficient can also be called a combining coefficient, a space-frequency-time weighting coefficient, etc. Each space-frequency-time combining coefficient may correspond to a space-domain vector, a frequency-domain vector, and a time-domain vector. Each space-frequency-time combining coefficient is a weighting coefficient of the space-frequency-time component three-dimensional matrix constructed by the space-frequency-time vector group to which it corresponds. A space-frequency-time combining coefficient corresponds to a space-domain vector, a frequency-domain vector, and a time-domain vector. Specifically, the space-frequency-time combining coefficient three-dimensional matrix The (i, j, k) element in is the space-frequency-time combining coefficient corresponding to the space-frequency-time vector group of the i-th space-domain vector, the j-th frequency-domain vector, and the k-th time-domain vector.

[0146] Each space-frequency-time combining coefficient includes amplitude and phase. For example, the space-frequency-time combining coefficient can be expressed as ae jθ , a is the amplitude of the space-frequency combining coefficient, and θ is the phase of the space-frequency combining coefficient.

[0147] The amplitude value of some space-frequency combining coefficients may be zero or close to zero, and the corresponding quantization value may be zero. The space-frequency combining coefficients whose amplitude is quantized by the quantization value zero may be called the space-frequency combining coefficients whose amplitude is zero. Correspondingly, the amplitude values ​​of some space-frequency combining coefficients are large, and the corresponding quantization values ​​are not zero. The space-frequency combining coefficients whose amplitude is quantized by the non-zero quantization value may be called the space-frequency combining coefficients whose amplitude is greater than zero.

[0148] 11. Duplex communication:

[0149] In wireless communication systems, communications can be divided into different types according to the types of sending nodes and receiving nodes. In LTE or LTE-A communication systems and NR systems, communications can be mainly divided into frequency division duplex (FDD) mode and time division duplex (TDD) mode according to the different duplex modes. For wireless communication systems operating in TDD mode, the downlink carrier and uplink carrier of the system are carriers of the same carrier frequency. For wireless communication systems operating in FDD mode, the downlink carrier and uplink carrier of the system are in different frequency bands.

[0150] 12. Channel estimation:

[0151] In a TDD system, before transmitting data to a terminal device, the access network device can estimate the uplink channel based on the received uplink reference signal, and obtain the downlink channel based on the reciprocity of the uplink and downlink channels, thereby improving the transmission quality or rate of the downlink signal. However, the quality of the uplink reference signal received by the access network device is limited by the transmit power of the terminal device and the interference of other uplink signals, resulting in errors in the downlink channel obtained by the access network device, thereby affecting the transmission of the downlink signal. In this application, the uplink reference signal includes but is not limited to SRS; the downlink reference signal includes but is not limited to CSI-RS.

[0152] Among them, SRS is a reference signal sent by the terminal device. In the NR system, network devices are supported to use SRS to obtain uplink channel information. For TDD systems, network devices can also use channel reciprocity to obtain downlink channel information by measuring SRS, and then use the channel information to precode and transmit data to users.

[0153] The network device can use the uplink SRS signal to transform it from an antenna-frequency domain signal to a beam-delay domain signal. For each beam, calculate its delay power spectrum (power delay profile, PDP). In addition, the network device can also perform delay domain noise reduction, that is, according to the PDP, add a hard window to the non-zero path position of the delay domain signal, treat the signal outside the hard window as noise power, set the noise outside the hard window to zero, and use the estimated noise power inside the hard window to reduce the non-zero path. Beam domain noise reduction can then be performed, and the network device only retains the strongest several beams, and the energy of the remaining beams is set to zero, which is considered to be interference or noise. After noise reduction, the network device side obtains CSI information through SRS.

[0154] However, in the current channel estimation based on uplink reference signals such as SRS under TDD, the quality of the reference signal at the cell edge is poor due to the limitation of the uplink power of the terminal device and the limitation of the uplink reference signal resources. For example, in the SRS channel estimation, there may be a signal path with a signal power equivalent to the interference energy, resulting in inaccurate measurement of the weak signal path. In addition, in the case of a large number of RRC connected users, the transmission period of the uplink reference signal is long, resulting in a mismatch between the precoding and the channel of the terminal device at the corresponding moment, resulting in performance degradation. Therefore, the reliability of channel estimation needs to be improved.

[0155] In addition, in the FDD system, in order to improve the accuracy of the access network device in acquiring the downlink channel, the terminal device can estimate the downlink channel based on the received downlink reference signal, and feed back the downlink channel information to the access network device. Since the downlink channel information fed back by the terminal device is used to assist the network device in channel estimation based on the uplink reference signal, the downlink channel information fed back by the terminal device can be part of the downlink channel information to reduce the feedback overhead. For example, the access network device sends a downlink reference signal to the terminal device. The terminal device can determine the combining coefficient matrix, at least one spatial domain vector and multiple frequency domain vectors corresponding to each receiving antenna port based on the downlink reference signal. Optionally, the terminal device can feed back the channel information to the network device via a precoding matrix indicator (PMI).

[0156] Among them, PMI is an indication signal sent by the terminal device. In the NR system, the terminal device sends PMI to the network device, so that the network device finds the codeword closest to the downlink channel observed by the terminal device in the pre-defined codebook, and then obtains part of the downlink channel information, and uses the channel information to precode and transmit data to the user. However, due to the uplink feedback overhead, the feedback of PMI needs to reduce the amount of information in the channel feedback by quantizing the channel measurement results, and quantizing the channel measurement results will reduce the feedback accuracy, so the channel measurement results are reduced. For example Figure 2 As shown, based on the measurement of the downlink reference signal, the terminal device can feed back the PMI to the network device. The PMI indicates the combining coefficient of the shaded position shown in the figure. However, due to the quantization loss of the PMI, the feedback accuracy of the illustrated position will be reduced.

[0157] Therefore, the reliability of channel measurement based on uplink reference signals such as SRS and the reliability of channel measurement based on downlink reference signals such as CSI-RS need to be improved.

[0158] The present application provides a communication method, which can combine the uplink channel estimation result and the downlink channel estimation result to perform channel estimation, thereby improving the channel estimation performance. The method can be performed by a first communication device and a second communication device. The first communication device can be a terminal device, a network device, a component in a terminal device, or a component in a network device. In the present application, the component can include, for example, at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Figure 3 This method is introduced. Figure 3 In the example, the first communication device is a terminal device and the second communication device is a network device. It can be understood that the method when the first communication device is a network device and the second communication device is a terminal device can be implemented with reference, and will not be repeated in this application.

[0159] like Figure 3 As shown, the communication method provided in the embodiment of the present application may include steps S101 to S103:

[0160] S101: A terminal device receives a first reference signal through a first port and sends a second reference signal through a second port, and the first port is associated with the second port.

[0161] It can be understood that the timing of receiving the first reference signal and sending the second reference signal in S101 is not limited. The first reference signal can be received first and then the second reference signal can be sent, the second reference signal can be sent first and then the first reference signal can be received, or the second reference signal can be sent and the first reference signal can be received simultaneously.

[0162] The first reference signal may be a reference signal received by the terminal device from the network device, and the second reference signal may be a reference signal sent by the terminal device to the network device. Optionally, the first reference signal is a downlink reference signal, and the second reference signal is an uplink reference signal, for example, the first reference signal may be a CSI-RS, and / or the second reference signal may be an SRS.

[0163] In addition, when the first communication device is a network device and the second communication device is a terminal device, the first reference signal may be an SRS, and / or the second reference signal may be a CSI-RS.

[0164] It can be understood that the first port being associated with the second port may mean that there is an association relationship between the first port and the second port. In the present application, the association relationship may also be referred to as a corresponding relationship.

[0165] As an example, the association relationship between the first port and the second port can be reflected as follows: the first port and the second port correspond to the same physical port or antenna. For example, the first port belongs to a first port set, and the ports in the first port set can also be called receiving ports, such as receiving port 0, receiving port 1, receiving port 2, and receiving port 3; the second port belongs to a second port set, and the ports in the second port set can also be called sending ports, such as sending port 0, sending port 1, sending port 2, and sending port 3, wherein the ports in the first port set are all used to receive the first reference signal and / or other reference signals, and the ports in the second port set are all used to send the second reference signal and / or other reference signals. Among them, the ports in the first port set and the ports in the second port set can correspond one-to-one, for example, receiving port 0 and sending port 0 correspond to the same physical port or antenna, receiving port 1 and sending port 1 correspond to the same physical port or antenna, and so on.

[0166] As another example, the association relationship between the first port and the second port can be reflected as follows: the first port and the second port correspond to the same antenna port (antenna port) or logical port. For example, the first port belongs to a first port set, and the ports in the first port set can also be called receiving antenna ports, such as receiving antenna port 0, receiving antenna port 1, receiving antenna port 2, and receiving antenna port 3; the second port belongs to a second port set, and the ports in the second port set can also be called transmitting antenna ports, such as transmitting antenna port 0, transmitting antenna port 1, transmitting antenna port 2, and transmitting antenna port 3, wherein the antenna ports in the first port set are all used to receive the first reference signal and / or other reference signals, and the antenna ports in the second port set are all used to send the second reference signal and / or other reference signals. Among them, the ports in the first port set and the ports in the second port set can correspond one-to-one, for example, receiving antenna port 0 and transmitting antenna port 0 correspond to the same antenna port, receiving antenna port 1 and transmitting antenna port 1 correspond to the same antenna port, and so on.

[0167] Optionally, the association relationship between the ports in the first port set and the ports in the second port set may be configured by the network device, or may be predefined. In the present application, the network device configuration may refer to the network device indicating to the communication device through a configuration message, wherein the configuration message may include signaling or messages such as RRC messages, MAC CE or DCI. Predefined may refer to predefined configuration information or protocol definition.

[0168] For example, the network device may send configuration information to the terminal device to configure the correspondence between the ports in the first port set and the ports in the second port set. For example, the first port set may correspond to the ports with the same port index in the second port set by default. For example, port 0 in the first port set corresponds to port 0 in the second port set. Then the configuration information may be used to indicate or configure the index of the ports in the first port set. For another example, the configuration information may also carry multiple indexes of the ports in the first port set and multiple indexes of the ports in the second port set in sequence, wherein the ports with the same index in the first port set and the second port set correspond to each other. For example, the configuration information carries the indexes {3,2,1,0} of the ports in the first port set and the indexes {0,1,2,3} of the ports in the second port set, which means that receiving port 3 corresponds to sending port 0, receiving port 2 corresponds to sending port 1, and so on.

[0169] S102: The terminal device sends first information, where the first information is obtained based on first channel information, which is obtained based on a first reference signal. The first channel information and second channel information are used for channel estimation, and the second channel information is obtained based on a second reference signal.

[0170] The terminal device may determine the first channel information according to the first reference signal, for example, the first reference signal may be a CSI-RS, and the second reference signal may be an SRS. Accordingly, the first channel information may be a PMI or a transmission precoding matrix indicator (TPMI). The network device may obtain the second channel information according to the second reference signal, and the second channel information may be CSI information.

[0171] In addition, when the first communication device is a network device and the second communication device is a terminal device, the first reference signal may be an SRS, and the second reference signal may be a CSI-RS. Accordingly, the first channel information may be CSI information, and the second channel information may be a PMI or a TPMI.

[0172] Optionally, the network device may receive the first information and perform channel estimation according to the first information and the second channel information. The second channel information may be obtained according to the second reference signal after the network device receives the second reference signal.

[0173] In a possible embodiment, the first information may be used as PMI, or the first information may be included in PMI.

[0174] Optionally, the first channel information includes a first matrix, the first matrix corresponds to at least one spatial domain vector and multiple frequency domain vectors, the first matrix includes multiple combining coefficients, each combining coefficient is a combining coefficient of a spatial domain vector and a frequency domain vector, and the first information is used to indicate the amplitude and / or phase of at least one combining coefficient in the first matrix.

[0175] Taking the first reference signal as a downlink reference signal as an example, the terminal device can determine the channel matrix corresponding to each receiving antenna port, that is, the space-frequency matrix, according to the first reference signal, so that the corresponding combining coefficient matrix can be determined according to the space-frequency matrix. The following is an example of the space-frequency matrix corresponding to a receiving antenna port. The terminal device can perform channel estimation based on the downlink reference signal received by the receiving antenna port, determine the corresponding space-frequency matrix, and determine the combining coefficient matrix according to the space-frequency matrix. Among them, the combining coefficient matrix is ​​the first matrix.

[0176] Exemplarily, the space-frequency matrix H can be expressed as:

[0177] Among them, each column vector in W1 corresponds to a spatial domain vector, and each column vector in W3 corresponds to a frequency domain vector. is the merging coefficient matrix, the merging coefficient matrix The merging coefficient of the i-th row and j-th column in W1 corresponds to the i-th spatial vector in W1 and the j-th frequency vector in W3. It can be understood that each merging coefficient represents the signal amplitude and phase of the corresponding spatial vector and frequency vector positions.

[0178] Figure 4 Represents the merging coefficient matrix, in which each small square represents a merging coefficient. Each small square here only represents the position of a merging coefficient, that is, it represents the corresponding relationship between the merging coefficient and the spatial domain vector and the frequency domain vector. In the horizontal axis direction, the merging coefficients located on the same horizontal axis correspond to the same spatial domain vector; in the vertical axis direction, the merging coefficients located on the same vertical axis correspond to the same frequency domain vector. The dotted box in the figure indicates that the merging coefficients on the same vertical axis correspond to the same frequency domain vector. For example, in the figure, merging coefficient 1 corresponds to spatial domain vector 1 and frequency domain vector 0; merging coefficient 2 corresponds to spatial domain vector 2 and frequency domain vector 4. The position of the merging coefficient can be represented by the index of the spatial domain vector and the frequency domain vector, or the position of the merging coefficient in the merging coefficient matrix can be determined by the spatial domain vector index and the frequency domain vector index. For example, merging coefficient 1 can be identified as (1, 0), 1 represents the index of the spatial domain vector corresponding to merging coefficient 1, and 0 represents the index of the frequency domain vector corresponding to merging coefficient 1.

[0179] It can be understood that the first channel information is Figure 4The merging coefficient matrix shown (hereinafter referred to as the first matrix), the first information may include one or more merging coefficients in the first matrix.

[0180] It can also be understood that the first port corresponds to at least one first matrix, that is, the first information may include at least one first matrix. If the first port corresponds to multiple first matrices, the multiple first matrices may correspond to different time domain vectors.

[0181] Optionally, the terminal device may obtain the second information, and learn which information of the amplitude and phase of the combining coefficient that the first information needs to feedback based on the second information, so as to reasonably feedback the information required by the network device and reduce the feedback overhead. For example, when the second information indicates the amplitude of the feedback combining coefficient, the first information may indicate the amplitude of the combining coefficient without the need to feedback the phase of the combining coefficient. In addition, the terminal device may also learn based on a predefined information that the amplitude and / or phase of the combining coefficient needs to be fed back. For example, the second information may be determined by predefinition or by notification from the network device to the terminal device, or by notification from the terminal device to the network device.

[0182] As a possible embodiment, the amplitude of the combining coefficient included in the first information is obtained by normalizing the amplitude of the combining coefficient with the maximum amplitude to reduce the feedback overhead. For example, the first information may include the amplitude of the at least one combining coefficient normalized according to the combining coefficient with the maximum amplitude. In addition, the first information may also include the phase of the at least one combining coefficient.

[0183] For example, the amplitude of the largest combining coefficient is normalized to 1, and the amplitudes of other combining coefficients are normalized to values ​​between 0 and 1. The normalization method may be to use a normalization function, or to determine the normalized amplitude value by looking up a table. As an example, one combining coefficient in at least one combining coefficient is represented by ae jθ , a is the amplitude of the combining coefficient, θ is the phase of the combining coefficient, the amplitude of the maximum combining coefficient is b, then the normalized combining coefficient is expressed as (a / b)e jθ , (a / b) is the amplitude of the normalized combining coefficient, and θ is the phase of the normalized combining coefficient.

[0184] In addition, the normalized amplitude values ​​of one or more combining coefficients may be mapped to one or more bits, so that the normalized amplitude values ​​are indicated by one or more bits to achieve amplitude quantization. It is understood that the first information may include the one or more bits for indicating the normalized amplitude values ​​of one or more combining coefficients in a quantized manner.

[0185] The following is an explanation of how to determine the maximum merging coefficient.

[0186] (1) The maximum magnitude combining coefficient may be a combining coefficient with the maximum magnitude among all the combining coefficients of the first matrix.

[0187] For example, the terminal device obtains the first reference signal Figure 4 The first matrix shown in FIG. 1 , the maximum amplitude combining coefficient may be the maximum amplitude combining coefficient in the first matrix. The terminal device may normalize the amplitude of at least one combining coefficient in the first matrix according to the maximum amplitude combining coefficient, and report the normalized amplitude of at least one combining coefficient. Optionally, the terminal device may also report the phase of at least one combining coefficient.

[0188] (2) The combining coefficient with the largest amplitude may be the combining coefficient with the largest amplitude among all the combining coefficients corresponding to the first port.

[0189] If the first port corresponds to a plurality of first matrices, the first information may include a maximum magnitude combining coefficient among the plurality of first matrices. For example, the plurality of first matrices correspond to different time domain vectors.

[0190] (3) The maximum magnitude merging coefficient may be the merging coefficient with the largest magnitude among the at least one merging coefficient indicated by the first information. For example, when multiple merging coefficients need to be indicated, the merging coefficient with the largest magnitude may be determined from the multiple merging coefficients as the merging coefficient with the largest magnitude, and the other merging coefficients may be normalized.

[0191] For example, the merge coefficient that needs to be reported is Figure 4 The merging coefficient 1 (1, 0) and the merging coefficient 2 (2, 4) in the first matrix shown, and the amplitude of the merging coefficient 1 (1, 0) is greater than the amplitude of the merging coefficient 2 (2, 4), then the amplitude of the merging coefficient 1 (1, 0) can be normalized to 1, and the amplitude of the merging coefficient 2 (2, 4) can be normalized to a positive number less than 1 according to the amplitude of the merging coefficient 1 (1, 0). The first information may indicate the normalized amplitude of the merging coefficient 1 (1, 0) and the normalized amplitude of the merging coefficient 2 (2, 4), for example, the first information includes the quantized amplitude. In addition, the first information may also include the phase of the merging coefficient 1 (1, 0) and / or the phase of the merging coefficient 2 (2, 4). Among them, x in the merging coefficient (x, y) represents the index of the spatial domain vector corresponding to the merging coefficient, and y represents the index of the frequency domain vector corresponding to the merging coefficient.

[0192] In this implementation, in a possible embodiment, when there are multiple ports in the first port set, the first information corresponding to each port may be normalized according to different maximum amplitude combining coefficients, and the first information may include the normalized amplitude of at least one combining coefficient. In addition, the first information may also include the phase of at least one combining coefficient.

[0193] In another possible embodiment, the first information corresponding to the p-th port in the first port set may include: the magnitude relationship between the amplitude of the maximum amplitude combining coefficient corresponding to the p-th port and the amplitude of the maximum amplitude combining coefficient corresponding to at least one port of the P-1 ports other than the p-th port, for example, indicating the ratio or difference between the amplitudes of the two maximum amplitude combining coefficients, 1≤p≤P, P is the total number of ports in the first port set, and P is an integer greater than 1. In addition, the first information may also include the phase of at least one normalized combining coefficient.

[0194] (4) The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among all corresponding combining coefficients of the plurality of ports in the first port set.

[0195] For example, the first port set includes receiving port 0 to receiving port 3, so the combining coefficient with the largest amplitude may be the combining coefficient with the largest amplitude among all the combining coefficients included in all the combining coefficient matrices corresponding to receiving port 0 to receiving port 3.

[0196] In this implementation, the terminal device may also send the amplitude and / or phase of the maximum amplitude combining coefficient to the network device.

[0197] (5) The maximum amplitude combining coefficient is a set amplitude, for example, a public maximum amplitude configured by the network device or predefined.

[0198] Optionally, for any implementation of the maximum amplitude combining coefficient shown in (1) to (4), the terminal device may also feed back the phase and / or amplitude of the maximum amplitude combining coefficient.

[0199] As a possible embodiment, resources of the first reference signal may be divided into multiple subbands or multiple subcarriers, and the first information may correspond to one or more subbands or one or more subcarriers.

[0200] Wherein, for a single carrier system, any reference signal may occupy one or more subbands in a carrier, and correspondingly, the first reference signal may occupy one or more subbands. Wherein, if the first reference signal occupies multiple subbands, the terminal device may determine multiple first matrices and / or first information according to the channel estimation result of each subband, each first matrix includes multiple combining coefficients within a subband range, and each first information may represent the amplitude and / or phase of the combining coefficient within a subband range.

[0201] In addition, for a multi-carrier system, any reference signal may occupy one or more subcarriers, and the terminal device may determine multiple first matrices and / or first information based on the channel estimation results of each subband or subcarrier, each first matrix includes multiple combining coefficients within a subband range or a subcarrier range, and each first information may represent the amplitude and / or phase of the combining coefficient within a subband range or a subcarrier range.

[0202] Optionally, if the first reference signal corresponds to multiple subbands or multiple subcarriers, the positions of the combining coefficients indicated by the first information corresponding to any two subbands corresponding to the first port may be the same. For example, the first information 1 and the first information 2 correspond to two subbands occupied by the first reference signal, and the first information 1 and the first information 2 both correspond to the first port, wherein the first information 1 may indicate at least one combining coefficient 1 in the first matrix 1, and the first information 2 is used to indicate at least one combining coefficient 2 in the first matrix 2, and the spatial domain vector and frequency domain vector corresponding to at least one combining coefficient 1 in the first matrix 1 are the same as the spatial domain vector and frequency domain vector corresponding to at least one combining coefficient 2 in the first matrix 2. Therefore, optionally, for the first information 1 and the first information 2, the terminal device may feed back the spatial domain vector position and the frequency domain vector position to the network device once to indicate the common position of the combining coefficient indicated by the first information 1 and the combining coefficient indicated by the first information 2. In addition, the first information 1 may carry the amplitude and / or phase of at least one combining coefficient 1, and the first information 2 may carry the amplitude and / or phase of at least one combining coefficient 2.

[0203] Optionally, if the first reference signal corresponds to multiple subbands or multiple subcarriers, the first information corresponding to any two subbands or subcarriers can be normalized by the amplitude of the maximum amplitude of the combining coefficients in the multiple first matrices corresponding to the multiple subbands or multiple subcarriers. For example, the first information 1 and the first information 2 correspond to the two subbands occupied by the first reference signal, and the first information 1 and the first information 2 both correspond to the first port, wherein the first information 1 can indicate at least one combining coefficient 1 in the first matrix 1, and the first information 2 is used to indicate at least one combining coefficient 2 in the first matrix 2. Optionally, the maximum value of the amplitude of the combining coefficient with the maximum amplitude in the first matrix 1 and the amplitude of the combining coefficient with the maximum amplitude in the first matrix 2 can be used to quantize at least one combining coefficient 1 in the first matrix 1 and at least one combining coefficient 2 in the first matrix 2. The maximum value of the amplitude of the combining coefficient with the maximum amplitude in the first matrix 1 and the amplitude of the combining coefficient with the maximum amplitude in the first matrix 2 can be carried in the first information 1 or the first information 2 or a separate information, without specific limitation. In addition, optionally, the first information 1 may carry the normalized amplitude and / or phase of at least one combining coefficient 1, and the first information 2 may carry the normalized amplitude and / or phase of at least one combining coefficient 2.

[0204] Optionally, if the first reference signal corresponds to multiple subbands or multiple subcarriers, the first information corresponding to any two subbands or subcarriers can be normalized using a combining coefficient at the same position, and the position of the combining coefficient corresponds to the combining coefficient with the maximum amplitude in multiple first matrices corresponding to the multiple subbands or multiple subcarriers, or in other words, the positions of the combining coefficients with the maximum amplitude in the multiple first matrices are the same. For example, the first information 1 and the first information 2 correspond to two subbands occupied by the first reference signal, and the first information 1 and the first information 2 both correspond to the first port, wherein the first information 1 can indicate at least one combining coefficient 1 in the first matrix 1, and the first information 2 is used to indicate at least one combining coefficient 2 in the first matrix 2. In the case where the bandwidths corresponding to the two subbands are the same, the sizes of the two first matrices 1 are the same as the size of the first matrix 2, that is, the two matrices contain the same number of merging coefficients, and / or the number of spatial domain vectors and the number of frequency domain vectors corresponding to the merging coefficients are the same. At this time, it can be considered that the position of the maximum amplitude merging coefficient in the first matrix 1 is the same as the position of the maximum amplitude merging coefficient in the first matrix 2, that is, the spatial domain vector and the frequency domain vector of the maximum amplitude merging coefficient in the first matrix 1 are respectively the same as the spatial domain vector and the frequency domain vector of the maximum amplitude merging coefficient in the first matrix 2. Therefore, optionally, the terminal device can indicate to the network device the position of the maximum amplitude merging coefficient of the first matrix 1 or one of the first matrices 2 to save feedback overhead. Among them, the indication of the position of the maximum amplitude merging coefficient can be carried in the first information 1 or the first information 2 or a separate information, without specific limitation. In addition, optionally, the first information 1 can carry the normalized amplitude and / or phase of at least one merging coefficient 1, and the first information 2 can carry the normalized amplitude and / or phase of at least one merging coefficient 2.

[0205] As a possible embodiment, at least one combining coefficient indicated by the first information satisfies any one or more of the following conditions, or in other words, the combining coefficient reported by the terminal device satisfies any one or more of the following conditions:

[0206] Condition 1: at least one combining coefficient is a combining coefficient corresponding to a specific position in the first matrix indicated by the network device. That is, the network device may indicate the position of at least one combining coefficient in the first matrix, for example, the network device sends fourth information to the terminal device to indicate the space-frequency vector pair or Doppler shift corresponding to at least one combining coefficient. The space-frequency vector pair may be a combination of a space domain vector and a frequency domain vector.

[0207] For example, the network device may represent the combining coefficients to be fed back by a beam-delay domain vector (or a spatial domain vector and a frequency domain vector). Exemplarily, the second information may indicate (x, y), where x represents the index of the spatial domain vector corresponding to the combining coefficient, and y represents the index of the frequency domain vector corresponding to the combining coefficient.

[0208] Optionally, the network device may indicate to the terminal device the space-frequency vector pair of the combining coefficients that need to be fed back. Therefore, after the terminal device obtains the first matrix according to the first reference signal, the combining coefficients that need to be fed back to the network device may be determined according to the space-frequency vector pair indicated by the network device, so as to improve feedback reliability and reduce feedback overhead.

[0209] Optionally, the network device may obtain the second channel information based on the second reference signal, and determine the position of at least one combining coefficient in the first matrix based on the second channel information. For example, the second channel information may be a combining coefficient matrix obtained by the network device based on the second reference signal. The network device may determine at least one position in the combining coefficient matrix where the channel estimation accuracy needs to be improved based on the second channel information, that is, determine at least one space-frequency vector pair, and the at least one space-frequency vector pair may be used as the position of at least one combining coefficient in the first matrix. The network device may also send information about at least one space-frequency vector pair to the terminal device so that the terminal device learns the position of at least one combining coefficient in the first matrix.

[0210] Condition 2: at least one combining coefficient is a combining coefficient whose energy among the multiple combining coefficients included in the combining coefficient matrix is ​​greater than or equal to the first threshold and less than or equal to the second threshold, and the second threshold is less than or equal to the energy value of the combining coefficient with the largest energy among the multiple combining coefficients. In the present application, energy may refer to signal received power. Alternatively, in condition 2, at least one combining coefficient is a combining coefficient whose energy or signal to interference plus noise ratio information among the multiple combining coefficients included in the combining coefficient matrix is ​​greater than or equal to the first threshold and less than or equal to the second threshold, and the second threshold is less than or equal to the signal to interference plus noise ratio information of the combining coefficient with the largest signal to interference plus noise ratio information among the multiple combining coefficients. Among them, the signal to interference plus noise ratio information is used to represent the sum of interference and noise, for example, the signal to interference plus noise ratio information includes a signal to interference plus noise ratio (SINR) or a normalized SINR.

[0211] As an example, the SINR corresponding to the first port may be obtained by the terminal device measuring the first signal or other reference signals sent by the network device. For example, the terminal device may measure the CSI-RS to obtain the SINR corresponding to the first port.

[0212] The following uses energy as an example to illustrate the implementation of condition 2. A solution using SINR as a measure of whether condition 2 is satisfied may be implemented as a reference and will not be described in detail.

[0213] For example, as shown in FIG5(a), it is assumed that the energy of each of the multiple combining coefficients can be as shown in the figure, and the energy of the unmarked combining coefficient is 0. For example, the energy of the combining coefficient (1, 0) in the figure is 0, and the energy of the combining coefficient (1, 1) is 0.1.

[0214] In conjunction with FIG5(a), assuming that the first threshold is 0.3 and the second threshold is 0.5, as shown in FIG5(b), the merging coefficients that meet condition 2 are merging coefficient (1, 7), merging coefficient (1, 13), merging coefficient (1, 15), merging coefficient (2, 6), merging coefficient (2, 7), merging coefficient (2, 8), merging coefficient (2, 13), merging coefficient (2, 14), merging coefficient (3, 7), and merging coefficient (3, 8). The small grids filled with shades in the figure represent the merging coefficients that meet condition 2.

[0215] Condition three, at least one combining coefficient is Y2 combining coefficients with the smallest energy among Y1 combining coefficients whose energy is greater than or equal to the first threshold among the multiple combining coefficients, and Y2 is an integer less than Y1 and greater than 0. Alternatively, in condition three, at least one combining coefficient is Y2 combining coefficients with the smallest signal to interference plus noise ratio information among Y1 combining coefficients whose signal to interference plus noise ratio information is greater than or equal to the first threshold among the multiple combining coefficients, and Y2 is an integer less than Y1 and greater than 0.

[0216] The following uses energy as an example to illustrate the implementation of condition three. A solution using signal-to-interference-noise ratio information as a reference for determining whether condition three is met may be implemented and will not be described in detail.

[0217] Combined with Figure 5(a), the first threshold is 0.3, the value of Y1 is 10, and the value of Y2 is 5. Then, as shown in Figure 5(c), the merging coefficients that meet condition three are merging coefficient (1, 7), merging coefficient (1, 15), merging coefficient (2, 6), merging coefficient (2, 8), and merging coefficient (3, 7). The small grids filled with shades in the figure represent the merging coefficients that meet condition three.

[0218] In one implementation, when selecting Y2 merging coefficients with the smallest energy from Y1 merging coefficients, Y2 merging coefficients can be selected from Y1 merging coefficients in order from small to large according to the energy of the Y1 merging coefficients. If, during the selection process, there are multiple merging coefficients with equal energy, when the multiple merging coefficients with equal energy are all used as part of the Y2 merging coefficients, the number of selected merging coefficients is greater than Y2, then only a part of the merging coefficients with equal energy can be selected (for example, a part can be randomly selected or selected in other ways), so that the number of merging coefficients finally selected is equal to Y2. Of course, the multiple merging coefficients with equal energy can also be used as part of the Y2 merging coefficients, and the present application does not limit this.

[0219] For example, in conjunction with Figure 5(a), the first threshold is 0.3, the value of Y1 is 10, and if the value of Y2 is 4. At this time, the merging coefficient (1, 7), the merging coefficient (1, 15), and the merging coefficient (2, 6) are selected in turn. Since the energy of the merging coefficient (2, 8) and the merging coefficient (3, 7) are equal, if both of these merging coefficients are selected, the number of merging coefficients will be greater than Y2. At this time, one of the merging coefficients can be randomly selected. Here, the merging coefficient (2, 8) is selected as an example. Then, as shown in Figure 5(d), the merging coefficients that meet condition three can be merging coefficients (1, 7), merging coefficients (1, 15), merging coefficients (2, 6), and merging coefficients (2, 8). The small grids filled with shades in the figure represent merging coefficients that meet condition three.

[0220] Condition 4: at least one combining coefficient is Y4 combining coefficients with the smallest energy among Y3 combining coefficients with the largest energy among the multiple combining coefficients, and Y4 is an integer less than Y3 and greater than 0. Alternatively, in Condition 4, at least one combining coefficient is Y4 combining coefficients with the smallest signal to interference plus noise ratio information among Y3 combining coefficients with the largest signal to interference plus noise ratio information among the multiple combining coefficients, and Y4 is an integer less than Y3 and greater than 0.

[0221] The following uses energy as an example to illustrate the implementation of condition 4. A solution using signal-to-interference-noise ratio information as a reference for determining whether condition 4 is satisfied may be implemented and will not be described in detail.

[0222] Combined with Figure 5(a), if the value of Y3 is 5 and the value of Y4 is 2, then the two merging coefficients with the smallest energy are selected from the five merging coefficients with the largest energy. Then, as shown in Figure 5(e), the merging coefficients that meet condition four are merging coefficients (2, 15) and merging coefficients (3, 9). The small grids filled with shades in the figure represent the merging coefficients that meet condition four.

[0223] Similarly, in one implementation, when selecting Y4 merging coefficients with the smallest energy from Y3 merging coefficients, Y4 merging coefficients can be selected from Y3 merging coefficients in order from small to large in terms of the energy of the Y3 merging coefficients. If, during the selection process, there are multiple merging coefficients with equal energy, when the multiple merging coefficients with equal energy are all used as part of the Y4 merging coefficients, the number of selected merging coefficients is greater than Y4, then only a part of the merging coefficients with equal energy can be selected (for example, a part can be randomly selected or selected in other ways), so that the number of merging coefficients finally selected is equal to Y4. Of course, the multiple merging coefficients with equal energy can also be used as part of the Y4 merging coefficients, and the present application does not limit this.

[0224] Condition 5: at least one combining coefficient is a combining coefficient whose energy is less than or equal to a second threshold value among the Y3 combining coefficients with the largest energy among the multiple combining coefficients, and the second threshold value is less than the energy of the combining coefficient with the largest energy among the multiple combining coefficients. At least one combining coefficient is a combining coefficient whose signal to interference plus noise ratio information is less than or equal to the second threshold value among the Y3 combining coefficients with the largest signal to interference plus noise ratio information among the multiple combining coefficients, and the second threshold value is less than the signal to interference plus noise ratio information of the combining coefficient with the largest signal to interference plus noise ratio information among the multiple combining coefficients.

[0225] The following uses energy as an example to illustrate the implementation of condition five. A solution using signal to interference noise ratio information as a reference for determining whether condition five is met may be implemented and will not be described in detail.

[0226] In conjunction with FIG5(a), if the value of Y3 is 5 and the second threshold is 0.7, then as shown in FIG5(f), the merging coefficients that meet condition five are merging coefficient (1, 14), merging coefficient (2, 10), merging coefficient (2, 15), and merging coefficient (3, 9). The small grids filled with shades in the figure represent the merging coefficients that meet condition five.

[0227] Condition six: at least one combining coefficient is a combining coefficient whose energy is greater than or equal to a first threshold among multiple combining coefficients.

[0228] In conjunction with FIG5(a), if the first threshold is 0.7, then as shown in FIG5(g), the merging coefficients that meet condition six are merging coefficient (1, 14), merging coefficient (2, 10), and merging coefficient (2, 11). The small grids filled with shades in the figure represent merging coefficients that meet condition six.

[0229] In a possible embodiment, in any one of conditions 2 to 6, the terminal device may select a spatial domain vector and / or a frequency domain vector of at least one combining coefficient, and indicate the selected spatial domain vector and / or frequency domain vector (i.e., indicate the position of at least one combining coefficient) to the network device to notify the network device to focus on measuring the portion of channel information. For example, the network device may send a beamformed CSI-RS according to the spatial domain vector selected by the terminal device, and the CSI-RS is used as a first reference signal, and the terminal device performs measurement according to the first reference signal, thereby focusing on obtaining at least one combining coefficient corresponding to the selected spatial domain vector and / or frequency domain vector.

[0230] An optional way is that the terminal device carries information for indicating the position of at least one combining coefficient in the first information, that is, the spatial domain vector and / or frequency domain vector of at least one combining coefficient is indicated by the first information, and the position of at least one combining coefficient is indicated. For example, the first information may carry a spatial domain vector and / or frequency domain vector of at least one combining coefficient. For another example, when the terminal device receives the fourth information from the network device, that is, when the terminal device receives the position indication of multiple combining coefficients from the network device, the first information may carry indication information for indicating the respective positions of the multiple combining coefficients. For example, the multiple positions indicated by the fourth information may be numbered (or sorted), and the first information may carry the relationship between the position number and the amplitude and / or phase of the combining coefficient to indicate the position corresponding to the amplitude and / or phase of the combining coefficient; or, the amplitude and / or phase of multiple combining coefficients may be carried in the first information in order of increasing or decreasing numbers, so that the network device can know the position corresponding to the amplitude and / or phase of each combining coefficient. In this example, the terminal device can also indicate the sorting rules of the positions of the merging coefficients to the network device, or adopt the sorting rules that are already known to both the terminal device and the network device. For example, the sorting rules are indicated by the network device, or both the terminal device and the network device can know them through predefined information.

[0231] In addition, the terminal device may also indicate the position of at least one combining coefficient to the network device through information or messages other than the first information.

[0232] In the above conditions 2 to 6, the values ​​of Y1, Y2, Y3 and Y4 can be determined by the network device or the network device configuration, or by the terminal device, or can be pre-agreed values ​​or predefined values, which is not limited in this application.

[0233] In the present application, after the network device obtains the first information, the accuracy of the channel estimation can be improved according to the first information. For example, the network device can perform channel estimation according to the uplink reference signal from the terminal device, thereby obtaining a merging coefficient matrix with noise / interference, hereinafter referred to as the second matrix. The network device can calculate the energy distribution of each row of merging coefficients in the second matrix, and obtain a non-zero merging coefficient estimate according to the energy distribution. Due to the presence of noise / interference, the energy of some merging coefficients in the second matrix changes. For example, a merging coefficient has an energy of 0 in the absence of noise / interference, but due to noise / interference, the energy of the merging coefficient may be greater than 0. In this case, it is impossible to distinguish which merging coefficients have an energy determined according to noise / interference. In order to eliminate noise / interference, an energy threshold can be set, and those greater than or equal to the energy threshold are used as non-zero merging coefficients, and those less than the energy threshold are used as noise / interference, that is, the energy of the merging coefficients less than the energy threshold is set to zero, thereby reducing noise / interference.

[0234] However, in the absence of noise / interference, the energy of some combining coefficients is very small. When there is noise / interference, the energy of these combining coefficients may be equivalent to the energy of the combining coefficients corresponding to the noise / interference. If an energy threshold is set, this part of the combining coefficients with smaller energy will be directly set to zero by the network device as noise / interference, resulting in a decrease in the accuracy of space-frequency channel estimation. In the present application, after the network device obtains the first information, it can determine the position of at least one combining coefficient indicated by the first information, and then even if the energy of the combining coefficient corresponding to the position indicated by the first information in the second matrix is ​​less than the energy threshold, the network device will no longer set the energy of these combining coefficients to 0, but retain the energy of these combining coefficients, thereby reducing noise / interference while retaining the corresponding space-frequency vector pairs and improving the accuracy of channel estimation.

[0235] It can be understood that in the present application, the first threshold corresponding to the energy may be different from the first threshold corresponding to the signal to interference plus noise ratio information, and / or the second threshold corresponding to the energy may be different from the second threshold corresponding to the signal to interference plus noise ratio information.

[0236] The following takes the determination method of the first threshold and the second threshold corresponding to energy as an example to illustrate the determination method of the first threshold and the second threshold in the present application, and the determination method of the first threshold and the second threshold corresponding to the signal to interference noise ratio information can be implemented with reference to it.

[0237] In the present application, there may be multiple implementations of the first threshold.

[0238] In a possible embodiment, the first threshold and / or the second threshold may be predefined, or may be indicated by the network device to the terminal device, or may be indicated by the terminal device to the network device. For example, the network device may send indication information of the first threshold to the terminal device so that the terminal device learns the first threshold, and / or the network device may send indication information of the second threshold to the terminal device so that the terminal device learns the second threshold. Taking the first threshold as an example, the indication information of the first threshold may be an index of the first threshold in a table, or may be at least one bit mapped by the first threshold. The indication information of the first threshold may refer to the implementation.

[0239] In another implementation, the first threshold is the product of the energy of a merging coefficient with the largest energy among the multiple merging coefficients and the first coefficient, and the first coefficient is greater than 0 and less than 1.

[0240] In another implementation, the first threshold is the energy of the first combining coefficient.

[0241] The first merging coefficient may satisfy any of the following conditions:

[0242] In case one, the sum of the energies of the merging coefficients that are greater than or equal to the energy of the first merging coefficient among the multiple merging coefficients is the first total energy, the sum of the energies of the multiple merging coefficients is the second total energy, and the ratio of the first total energy to the second total energy is equal to the first ratio.

[0243] Case 2: the multiple merging coefficients include a first merging coefficient and a second merging coefficient, the sum of the energies of the merging coefficients whose energy is greater than or equal to the first merging coefficient among the multiple merging coefficients is the first total energy, the sum of the energies of the multiple merging coefficients is the second total energy, and the sum of the energies of the merging coefficients whose energy is greater than or equal to the second merging coefficient among the multiple merging coefficients is the third total energy; the energy of the first merging coefficient is greater than the energy of the second merging coefficient, and when the multiple merging coefficients are sorted from large to small according to energy, the first merging coefficient and the second merging coefficient are adjacent in sequence, that is, when the multiple merging coefficients are sorted from large to small according to energy, the first merging coefficient and the second merging coefficient do not include merging coefficients whose energy is greater than or less than the second merging coefficient.

[0244] In case 2, the ratio of the first total energy to the second total energy is smaller than the first ratio, and the ratio of the third total energy to the second total energy is larger than the first ratio.

[0245] Case 3: the multiple merging coefficients include the first merging coefficient and the third merging coefficient, the sum of the energies of the merging coefficients of the multiple merging coefficients that are greater than or equal to the energy of the first merging coefficient is the first total energy, the sum of the energies of the multiple merging coefficients is the second total energy, and the sum of the energies of the merging coefficients of the multiple merging coefficients that are greater than or equal to the third merging coefficient is the fourth total energy; the energy of the third merging coefficient is greater than the energy of the first merging coefficient, and when the multiple merging coefficients are sorted from large to small according to energy, the third merging coefficient and the first merging coefficient are adjacent in sequence, that is, when the multiple merging coefficients are sorted from large to small according to energy, the third merging coefficient and the first merging coefficient do not include merging coefficients whose energy is greater than or less than the energy of the first merging coefficient;

[0246] In case three, the ratio of the first total energy to the second total energy is greater than the first ratio, and the ratio of the fourth total energy to the second total energy is less than the first ratio.

[0247] In the present application, the value of the first ratio is not limited, for example, the first ratio is 95%. The first ratio can be configured by the network device, can be determined by the terminal device, or can be a pre-agreed value, which is not limited in the present application.

[0248] In the present application, there may be multiple implementations of the second threshold. In one implementation, the second threshold is the product of the energy of the largest combining coefficient among the multiple combining coefficients and the second coefficient, and the second coefficient is greater than 0 and less than 1.

[0249] In another implementation, the second threshold is the energy of the fourth combining coefficient in the first set.

[0250] The first set includes all the combining coefficients whose energy is greater than or equal to the first threshold among the multiple combining coefficients, or the first set includes Y3 combining coefficients whose energy is largest among the multiple combining coefficients.

[0251] In this application, the fourth combination coefficient may satisfy any of the following conditions:

[0252] Case four: the sum of the energies of the combining coefficients in the first set that are less than or equal to the energy of the fourth combining coefficient is the fifth total energy, the sum of the energies of all the combining coefficients included in the first set is the sixth total energy, and the ratio of the fifth total energy to the sixth total energy is equal to the second ratio.

[0253] Case five, the first set includes the fourth combining coefficient and the fifth combining coefficient, the sum of the energies of the combining coefficients of the energy in the first set which is less than or equal to the fourth combining coefficient is the fifth total energy, the sum of the energies of all the combining coefficients included in the first set is the sixth total energy, and the sum of the energies of the combining coefficients of the energy in the first set which is less than or equal to the fifth combining coefficient is the seventh total energy.

[0254] The energy of the fourth combining coefficient is greater than the energy of the fifth combining coefficient, and when all the combining coefficients included in the first set are sorted from large to small according to energy, the fourth combining coefficient and the fifth combining coefficient are adjacent to each other in sequence, that is, when all the combining coefficients included in the first set are sorted from large to small according to energy, the fourth combining coefficient and the fifth combining coefficient do not include combining coefficients whose energy is greater than or less than the energy of the fifth combining coefficient.

[0255] In case five, the ratio of the fifth total energy to the sixth total energy is greater than the second ratio, and the ratio of the seventh total energy to the sixth total energy is less than the second ratio.

[0256] Case six: the first set includes the fourth combining coefficient and the sixth combining coefficient, the sum of the energies of the combining coefficients of the energy in the first set which is less than or equal to the fourth combining coefficient is the fifth total energy, the sum of the energies of all the combining coefficients included in the first set is the sixth total energy, and the sum of the energies of the combining coefficients of the energy in the first set which is less than or equal to the sixth combining coefficient is the eighth total energy.

[0257] The energy of the sixth combining coefficient is greater than the energy of the fourth combining coefficient, and when all the combining coefficients included in the first set are sorted from large to small according to energy, the sixth combining coefficient and the fourth combining coefficient are sequentially adjacent, that is, when all the combining coefficients included in the first set are sorted from large to small according to energy, the sixth combining coefficient and the fourth combining coefficient do not include combining coefficients whose energy is greater than or less than the energy of the fourth combining coefficient;

[0258] In case six, the ratio of the fifth total energy to the sixth total energy is smaller than the second ratio, and the ratio of the eighth total energy to the sixth total energy is larger than the second ratio.

[0259] In the present application, the value of the second ratio is not limited, for example, the second ratio is 40%. The second ratio can be configured by the network device, can be determined by the terminal device, or can be a pre-agreed value, which is not limited in the present application.

[0260] Through the above method, the terminal device only needs to feed back a part of the combining coefficients of all the combining coefficients included in the first matrix through the first information, thereby reducing feedback overhead and improving feedback efficiency.

[0261] Optionally, the first information may also include confidence information corresponding to at least one combining coefficient. The confidence information may include signal to interference and noise ratio information or energy information. The confidence information can be used to measure the confidence of the combining coefficient. In the present application, the confidence information corresponds to the first port, so that the network device determines whether to perform joint channel estimation based on the first information and the second channel information according to the confidence information. Exemplarily, when it is determined that the signal to interference and noise ratio meets certain conditions, the network device may perform channel estimation in combination with the first information and the second channel information, for example, the signal to interference and noise ratio information or the energy information meets at least one of the aforementioned conditions one to six.

[0262] Taking the signal to interference plus noise ratio information as an example, the signal to interference plus noise ratio information corresponding to the first port may include:

[0263] (1) A signal to interference plus noise ratio corresponding to at least one combining coefficient indicated by the first information, or referred to as feedback signal to interference plus noise ratio information at the PMI level.

[0264] In a possible embodiment of the present application, the signal-to-interference-and-noise ratio information corresponding to the multiple combining coefficients may be the signal-to-interference-and-noise ratios of the multiple combining coefficients. For example, the terminal device may send the signal-to-noise ratio information of the multiple combining coefficients to the network device. The signal-to-noise ratio information of the multiple combining coefficients may be carried in the first information or other information, which is not specifically limited in the present application.

[0265] In another possible embodiment of the present application, the terminal device may also sum the signal energies corresponding to multiple combining coefficients, and sum the interference and noise energies of the multiple combining coefficients, and represent the signal-to-interference-noise ratio information corresponding to the multiple combining coefficients by the ratio of the summed signal energy to the summed interference and noise energy.

[0266] In another possible embodiment of the present application, the signal to interference plus noise ratio information corresponding to the multiple combining coefficients may also be an average value of the signal to interference plus noise ratios of the multiple combining coefficients.

[0267] In addition, the signal to noise ratio information corresponding to the multiple combining coefficients may also be information after the signal to noise ratios of the multiple combining coefficients are normalized and quantized. For example, the information includes multiple n-bit information, each n-bit information may correspond to a combining coefficient, and is used to indicate the normalized and quantized signal to noise ratio of the combining coefficient, where n is a positive integer.

[0268] For example, the first information is used to indicate Figure 4 The first information may also indicate the signal to interference plus noise ratio corresponding to the combining coefficient 1 (1, 0) and the signal to interference plus noise ratio corresponding to the combining coefficient 2 (2, 4), the normalized and quantized signal to interference plus noise ratio, or the sum of the signal to interference plus noise ratios.

[0269] For another example, when the first port corresponds to a plurality of combining coefficient matrices (or space-frequency matrices), if the amplitudes and / or phases of the combining coefficients in the plurality of combining coefficient matrices are respectively indicated by a plurality of first information, then the signal to interference noise ratio of one or more combining coefficients at a common position in the plurality of combining coefficient matrices may be indicated, which is referred to as the signal to interference noise ratio information at the feedback path level. The plurality of combining coefficient matrices include the first matrix.

[0270] Among them, the common position refers to the position of the same combining coefficient corresponding to multiple combining coefficient matrices corresponding to multiple space-frequency matrices. For example, when the first information indicates the amplitude and / or phase of at least one combining coefficient in combining coefficient matrix 1 and the amplitude and / or phase of at least one combining coefficient in combining coefficient matrix 2, the terminal device can indicate the signal to interference plus noise ratio corresponding to combining coefficient 1 (1, 0) in combining coefficient matrix 1 and / or combining coefficient matrix 2 to the network device as the signal to interference plus noise ratio information corresponding to combining coefficient matrix 1 and combining coefficient matrix 2.

[0271] Similarly, the energy in the present application may be energy information corresponding to at least one combining coefficient indicated by the first information. In the present application, the energy information corresponding to multiple combining coefficients may be the energy of multiple combining coefficients (such as signal receiving power), the sum of the energy of multiple combining coefficients, or the mean of the energy of multiple combining coefficients. In addition, the energy information corresponding to multiple combining coefficients may also be the information after the energy information of multiple combining coefficients is normalized and quantized.

[0272] (2) Signal-to-interference-plus-noise ratio information corresponding to the first port, that is, the signal-to-interference-plus-noise ratio information corresponds to all combining coefficients of the first port. When the first port corresponds to multiple combining coefficient matrices, the signal-to-interference-plus-noise ratio information may correspond to multiple combining coefficient matrices, that is, one piece of signal-to-interference-plus-noise ratio information may be fed back for multiple combining coefficient matrices. The multiple combining coefficient matrices include the first matrix.

[0273] For example, at this time, the signal to noise ratio information may include the signal to noise ratio corresponding to any one of the combining coefficient matrices, which is used to represent the signal to noise ratio information corresponding to all the combining coefficient matrices. Among them, the signal to noise ratio corresponding to any one of the combining coefficient matrices may be the signal to noise ratio corresponding to at least one combining coefficient indicated by the first information corresponding to the combining coefficient matrix, for example, including the signal to noise ratio corresponding to all the combining coefficients, or may be the signal to noise ratio of one or more combining coefficients after normalization and quantization, or may be the signal to noise ratio of one or more combining coefficients respectively, or may be the ratio of the sum of the capabilities of multiple combining coefficients to the sum of interference and noise, or may be the average of the signal to noise ratios of multiple combining coefficients respectively. For example, the first information may include the signal to noise ratio corresponding to the first port, for example, when the terminal device feeds back multiple combining coefficients corresponding to the first port through multiple first information, the multiple first information may carry the same signal to noise ratio.

[0274] Similarly, the energy in the present application may be the signal receiving power corresponding to all the combining coefficients corresponding to the first port.

[0275] (3) The signal-to-interference-noise ratio of all the combined coefficients of the first matrix.

[0276] For example, the first information is used to indicate Figure 4 The amplitude and / or phase of one or more combining coefficients in the first matrix shown may indicate the signal to interference plus noise ratio corresponding to all the combining coefficients in the first matrix, or may indicate the normalized and quantized signal to interference plus noise ratio corresponding to all the combining coefficients, or may indicate the signal to interference plus noise ratio corresponding to all the combining coefficients, or may be the ratio of the sum of the capabilities of all the multiple combining coefficients to the sum of the interference and noise, or may be the average of the signal to interference plus noise ratios of all the multiple combining coefficients.

[0277] In this manner, when the first port set includes multiple ports, the signal to interference and noise ratio information sent by the terminal device to the network device may include the signal to interference and noise ratios of the multiple ports respectively.

[0278] Similarly, the energy in the present application may be the signal receiving power of all the combining coefficients of the first matrix.

[0279] (4) Signal-to-interference-plus-noise ratios corresponding to all the combining coefficients corresponding to the multiple ports in the first port set.

[0280] For example, when all ports in the first port set correspond to multiple combining coefficient matrices, the signal to interference plus noise ratio information may be the signal to interference plus noise ratio corresponding to all combining coefficients of all combining coefficient matrices, or may indicate the normalized and quantized signal to interference plus noise ratio corresponding to all combining coefficients, or may indicate the signal to interference plus noise ratio corresponding to all combining coefficients, or may be the ratio of the sum of the capabilities of all multiple combining coefficients to the sum of interference and noise, or may be the average of the signal to interference plus noise ratios of all multiple combining coefficients.

[0281] Similarly, the energy in the present application may be the signal receiving power corresponding to all the corresponding combining coefficients of the multiple ports in the first port set.

[0282] Optionally, the terminal device may receive the third information and learn the type of confidence information based on the third information, so as to reasonably feedback the information required by the network device and reduce the feedback overhead. For example, when the third information indicates that the terminal device feeds back the signal to interference noise ratio information corresponding to at least one combining coefficient indicated by the first information, the confidence information fed back by the terminal device may include the signal to interference noise ratio corresponding to the combining coefficient corresponding to the first information, without including the signal to interference noise ratio corresponding to other ports other than the first port or other combining coefficient matrices other than the first matrix. In addition, the terminal device may also learn the type of confidence information based on predefinition. For example, the third information may be determined by predefinition, by notifying the terminal device through the network device, or by notifying the network device through the terminal device.

[0283] S103: The network device may perform channel estimation according to the first information and the second channel information.

[0284] Therefore, the network device can enhance the accuracy of the second channel information according to the first information, or in other words, correct the channel estimation result, thereby improving the accuracy of the channel estimation.

[0285] In a possible embodiment, the network device may perform channel estimation based on the first information and the second channel information. Figure 6 As shown, the first ports in the first port set include the first port 1 to the first port p, and the ports in the second port set include the second port 1 to the second port p, where p is a positive integer, wherein the first port 1 is associated with the second port 1, the first port 2 is associated with the second port 2, ..., the first port p is associated with the second port p. Figure 6As shown, in the combining coefficient matrix corresponding to the first port 1 to the first port p, the black area indicates at least one combining coefficient indicated by the first information, and the network device can perform joint estimation based on the combining coefficient at the black position and the combining coefficient indicated by the second channel information at the shaded position to improve the channel estimation accuracy at the shaded position. The second channel information corresponds to the second port, for example, the channel estimation information corresponding to the second port 1 is the channel estimation result obtained according to the second reference signal sent by the second port 1. Taking the second reference signal as CSI-RS as an example, the second channel information is, for example, CSI information.

[0286] Optionally, in the implementation of joint channel estimation, the network device may select a combining coefficient 1 from at least one combining coefficient indicated by the first information, and select a combining coefficient 2 having the same or similar position from the second channel information, according to the position information of the combining coefficient. Further, the network device may perform a weighted average of the amplitude of combining coefficient 1 and the amplitude of combining coefficient 2, and / or perform a weighted average of the phase of combining coefficient 1 and the phase of combining coefficient 2, and the result of the weighted average is used as the combining coefficient of the corresponding position of the combining coefficient 2 under the joint channel estimation. The position information of combining coefficient 1 may be reported by the terminal device, or may be obtained according to the fourth information sent by the network device to the terminal device.

[0287] The weighted weight may be determined according to the confidence information reported by the terminal device. For example, when the signal interference to noise ratio corresponding to the second port is less than the signal interference to noise ratio information reported by the terminal device, it can be considered that the first information provides higher confidence merging coefficient information, and when merging, a higher weight may be given to the first information according to the signal interference to noise ratio information to merge the merging coefficients. Conversely, if the signal interference to noise ratio information reported by the terminal device is smaller, a smaller weight is given to the first information to merge the merging coefficients.

[0288] In any possible embodiment of the present application, the terminal device and the network device may use a complementary frame structure to transmit the first reference signal and the second reference signal. For example, the first frame structure and the second frame structure are complementary frame structures, wherein both include N subframes, each subframe corresponding to a time domain unit and a frequency domain unit.

[0289] It can be understood that each subframe in the first frame structure corresponds to a first frequency domain resource, and each subframe in the second frame structure corresponds to a second frequency domain resource, wherein the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain. For example, the first frame structure is a slot format corresponding to at least one subframe corresponding to the first frequency domain resource, and the second frame structure is a slot format corresponding to at least one subframe corresponding to the second frequency domain resource. Optionally, the first frequency domain resource is a carrier (CC), a subband or multiple subcarriers, and correspondingly, the second frequency domain resource is a CC, a subband or multiple subcarriers.

[0290] The form of the time slot format may refer to the description of the time slot format in the 3GPP related protocol, for example, the description in table 11.1.1-1 in technical specification (TS) 38.213 may refer to the description, and the name of the table is time slot format of normal cyclic prefix (CP). Among the subframes in the first frame structure and the subframes in the second frame structure corresponding to the same time domain unit, at least one subframe is a special subframe (S subframe), or one of the subframes is an uplink (U) subframe and the other subframe is a downlink (D) subframe. That is, for two CCs on a time slot or two subbands (subband) or other frequency domain granularity subframes, two subframes at the same time slot position include at least one S subframe, or one of the two subframes is a U subframe and the other is a D subframe.

[0291] As a possible implementation, Figure 8 As shown, for a multi-carrier system, the first frame structure and the second frame structure may correspond to different carriers. For example, the first frame structure corresponds to the first carrier, and the second frame structure corresponds to the second carrier. The first carrier includes a U subframe, an S subframe and / or a D subframe, and the second carrier includes a D subframe, an S subframe and / or a U subframe. For example, for any time slot, if the first carrier is configured as a U subframe, the second carrier configuration should be an S subframe or a D subframe; if the first carrier is configured as a D subframe, the second carrier configuration should be an S subframe or a U subframe; if the first carrier is configured as an S subframe, the second carrier configuration may be an S subframe, a D subframe or a U subframe.

[0292] As another possible implementation, Fig. 9As shown, for a single carrier system, the first frame structure and the second frame structure may correspond to different subbands in the same carrier. For example, the first frame structure corresponds to the first subband, and the second frame structure corresponds to the second subband. The first subband includes a U subframe, and an S subframe and / or a D subframe. The second subband includes a D subframe, and an S subframe and / or a U subframe. For any time slot, if the first subband is configured as a U subframe, the second subband configuration should be an S subframe or a D subframe; if the first subband is configured as a D subframe, the second subband configuration should be an S subframe or a U subframe; if the first subband is configured as an S subframe, the second subband configuration can be an S subframe, a D subframe, or a U subframe.

[0293] It can be understood that the above first port and second port correspond to different subframes on the first frequency domain resource, or the first port and second port correspond to different subframes on the second frequency domain resource.

[0294] For example, Fig. 9 For example, the second port corresponds to the uplink subframe U1, and the first port corresponds to the downlink subframe D1, or in other words, the second port sends the second reference signal through the uplink subframe U1, and the first port receives the first reference signal through the downlink subframe D1. Among them, the terminal device can also indicate the spatial domain vector selected by the terminal device through subframe U2, so that the network device sends a beamformed CSI-RS in the downlink subframe D1. The CSI-RS is used as the first reference signal, and the terminal device is measured according to the first reference signal, so as to focus on obtaining at least one combining coefficient corresponding to the selected spatial domain vector and / or frequency domain vector to improve the channel estimation performance. It can be seen that by adopting this frame structure, the terminal device can indicate the spatial domain vector selected by the terminal device to the network device in the same OFDM symbol, and receive the first reference signal beamformed according to the spatial domain vector, which can reduce the channel estimation delay and thus improve the channel estimation accuracy.

[0295] In addition, Fig. 9 For example, if the network device indicates to the terminal device the position of at least one combining coefficient that needs to be fed back based on the channel estimation result of the second reference signal, the network device can receive the second reference signal in the uplink subframe U1, and the network device can also indicate the position of at least one combining coefficient to the terminal device in the downlink subframe D2, so that the terminal device focuses on measuring the combining coefficient at the corresponding position based on the first reference signal of the downlink subframe D1 to improve the feedback efficiency. It can be seen that by adopting this frame structure, the terminal device can send the second reference signal to the network device in the same OFDM symbol and receive the position information of the combining coefficient obtained by the network device based on the second reference signal, which can improve the channel estimation efficiency, reduce the channel estimation delay and thus improve the channel estimation accuracy.

[0296] For example, the first reference signal is a downlink signal and the second reference signal is an uplink signal. The first reference signal can be carried in the D subframe or S subframe of the first frame structure and / or the second frame structure, and the second reference signal can be carried in the U subframe or S subframe of the first frame structure and / or the second frame structure.

[0297] Optionally, the above first frame structure and the second frame structure may be predefined or may be configured by a network device. If the first frame structure and the second frame structure are configured by a network device, the network device may send an indication of the first frame structure and the second frame structure to the communication device, and the indication may be referred to as fifth information, which is used to indicate the time-frequency position of the U subframe, S subframe and / or D subframe in the first frame structure and the second frame structure.

[0298] Exemplarily, the fifth information may be included in a signaling or information such as an RRC message, a MAC control element (CE) or downlink control information (DCI), and sent by the terminal device to the network device, or by the network device to the terminal device. In addition, the fifth information may also be predefined, and this application does not make specific restrictions.

[0299] In a possible embodiment, when sending the first reference signal, in the first port set shown in the present application, any two ports may correspond to different subbands or subcarriers, wherein at least two subbands or subcarriers corresponding to the ports may adopt Figure 8 or Fig. 9 The complementary frame structure shown, or in other words, any two ports in the first port set may correspond to a complementary frame structure. Any two subbands or subcarriers may be designed with a repeated reference signal sequence to reduce the cross-correlation of reference signals sent by any two ports in the first port set in different subbands or subcarriers. In addition, the full band occupied by the first reference signal adopts a low peak to average power ratio (PAPR).

[0300] In the present application, the number of inverse fast Fourier transform (IFFT) points used for frequency-time transformation of the first reference signal, such as CSI-RS, may be greater than the number of frequency domain granularities, for example, 2 to the power of m, where m is the number of frequency domain granularities. The number of frequency domain granularities refers to the number of subcarriers or the number of resource elements (RE). Optionally, the number of frequency domain granularities may be predefined or may be configured by a network device. If the number of frequency domain granularities is configured by a network device, the network device may send an indication or configuration information of the number of frequency domain granularities to the communication device, which is used to indicate or configure the value of the number of frequency domain granularities.

[0301] Exemplarily, the indication or configuration information may be included in signaling or information such as an RRC message, MAC CE or DCI.

[0302] It is understood that this application does not limit Figures 7 to 9 The complementary frame structure shown in any one of the items is applied in other communication scenarios. For example, in a channel measurement scenario other than the present application, a complementary frame structure may also be used. Fig. 9 For example, the network device can send a downlink reference signal in subframe D2, the terminal device can perform channel estimation on the downlink reference signal, and feedback channel estimation information to the network device through subframe U1, such as feedback PMI, thereby reducing the channel estimation delay and improving the reliability of the channel estimation result.

[0303] This method ensures that uplink or downlink transmission can be performed in each subframe. When data or signaling information or feedback information needs to be transmitted with extremely low latency, the complementary frame structure design can ensure that the data or information can be transmitted uplink or downlink in the current or next subframe. The feedback information includes, for example, hybrid automatic repeat request (HARQ) information, or includes acknowledgment (ACK) or negative acknowledgement (NACK) information.

[0304] Based on the same concept, the embodiment of the present application also provides a communication device. The communication device may include hardware structures and / or software modules corresponding to the functions shown in the above method. Those skilled in the art should easily appreciate that, in combination with the units and method steps of each example described in the embodiment disclosed in the present application, 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 the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0305] Figures 10 to 12A schematic diagram of a possible communication device provided in an embodiment of the present application. The communication device can be used to implement the functions of the terminal device and / or network device in the above method embodiment, and thus can also achieve the beneficial effects of the above method embodiment. In a possible implementation, the terminal device and / or network device can be as follows: Figure 1 The terminal device or network device shown. For relevant details and effects, please refer to the description of the above embodiments.

[0306] like Fig.10 As shown, the communication device 1000 includes a processing unit 1010 and a communication unit 1020. The communication unit 1020 can implement corresponding communication functions, and the processing unit 1010 is used to perform data processing. The communication unit 1020 can also be a transceiver unit or an input / output interface. The communication device 1000 can be used to implement the above Figure 3 The functions of the terminal device and / or the network device in the method embodiment are shown.

[0307] For example, when implementing the functions of the terminal device, the communication unit 1020 may be used to receive a first reference signal through a first port and send a second reference signal through a second port, and to send first information. The processing unit 1010 may be used to obtain first information according to the first reference signal.

[0308] Optionally, the communication unit 1020 may also be used to receive at least one of the second information, the third information, the fourth information, and the fifth information. In addition, the communication unit 1020 may also be used to send confidence information.

[0309] For another example, when implementing the function of the network device, the communication unit 1020 may be used to send a first reference signal, and to receive a second reference signal and first information. The processing unit 1010 may be used to perform joint channel estimation according to the first information and the second channel information.

[0310] Optionally, the communication unit 1020 may also be used to send at least one of the second information, the third information, the fourth information, and the fifth information. In addition, the communication unit 1020 may also be used to receive confidence information. The processing unit 1010 may be used to perform joint channel estimation according to the first information and the second channel information when the confidence information satisfies a condition.

[0311] The meanings of the above-mentioned techniques can be found in the description of the method embodiment section and will not be repeated here.

[0312] It can be understood that the division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0313] like Fig.11 The communication device 1100 provided in the embodiment of the present application is shown, which is used to implement the communication method provided in the present application. The communication device 1100 may be a communication device that applies the communication method, or a component in the communication device, or a device that can be used in combination with the communication device. The communication device 1100 may be a terminal device and / or a network device. Among them, the communication device 1100 may be a chip system or a chip. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. The communication device 1100 includes at least one processor 1120, which is used to implement the communication method provided in the embodiment of the present application. The communication device 1100 may also include an input and output interface 1110, and the input and output interface may include an input interface and / or an output interface. In the embodiment of the present application, the input and output interface 1110 may be used to communicate with other devices through a transmission medium, and its functions may include sending and / or receiving. For example, when the communication device 1100 is a chip, it is transmitted with other chips or devices through the input and output interface 1110. The processor 1120 may be used to implement the method shown in the above method embodiment.

[0314] Exemplarily, the processor 1120 may be used to execute actions executed by the processing unit 1010 , and the input / output interface 1110 may be used to execute actions executed by the communication unit 1020 , which will not be described in detail.

[0315] Optionally, the communication device 1100 may further include at least one memory 1130 for storing program instructions and / or data. The memory 1130 is coupled to the processor 1120. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1120 may operate in conjunction with the memory 1130. The processor 1120 may execute program instructions stored in the memory 1130. At least one of the at least one memory may be integrated with the processor.

[0316] In an embodiment of the present application, the memory 1130 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random access memory (RAM). The memory is any other medium that can be used to carry or store a desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing program instructions and / or data.

[0317] In the embodiment of the present application, the processor 1120 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiment of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0318] like Fig.12 The communication device 1200 provided in the embodiment of the present application is shown, which is used to implement the communication method provided in the present application. The communication device 1200 may be a communication device that applies the communication method shown in the embodiment of the present application, or it may be a component in the communication device, or it may be a device that can be used in combination with the communication device. The communication device 1200 may be a network device and / or a terminal device. Among them, the communication device 1200 may be a chip system or a chip. In the embodiment of the present application, the chip system may be composed of a chip, or it may include a chip and other discrete devices. Part or all of the communication methods provided in the above embodiments may be implemented by hardware or by software. When implemented by hardware, the communication device 1200 may include: an input interface circuit 1201, a logic circuit 1202, and an output interface circuit 1203.

[0319] Optionally, taking the device being used to implement the function of the receiving end as an example, the input interface circuit 1201 can be used to execute the above-mentioned receiving action performed by the communication unit 1020, the output interface circuit 1203 can be used to execute the above-mentioned sending action performed by the communication unit 1020, and the logic circuit 1202 can be used to execute the above-mentioned action performed by the processing unit 1010, which will not be repeated.

[0320] Optionally, the communication device 1200 may be a chip or an integrated circuit in a specific implementation.

[0321] Part or all of the operations and functions performed by the communication device described in the above method embodiments of the present application can be completed using a chip or an integrated circuit.

[0322] An embodiment of the present application provides a computer-readable storage medium storing a computer program, wherein the computer program includes instructions for executing the above method embodiment.

[0323] An embodiment of the present application provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute the above method embodiment.

[0324] The present invention provides a communication system including a terminal device and a network device to implement Figure 3 In addition, Figure 3 Combined with or independent of Figure 3 In this communication system, the network device may send fifth information to the terminal device to indicate a complementary frame structure, and accordingly, the terminal device may receive and / or send signals according to the complementary frame structure.

[0325] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or 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.

[0326] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer instructions on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that contains one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, an SSD), etc.

[0327] Note: A portion of this patent application document contains material which is subject to copyright protection. The copyright owner reserves all rights reserved except for the production of copies of the material in the patent file or patent record in the Patent Office.

[0328] The terminal devices and network devices in the above-mentioned various device embodiments correspond to the terminal devices and network devices in the method embodiments, respectively, and the corresponding modules or units perform the corresponding steps. For example, the communication unit (transceiver) performs the steps of receiving or sending in the method embodiments, and other steps except sending and receiving can be performed by the processing unit (processor). The functions of the specific units can refer to the corresponding method embodiments. Among them, the processor can be one or more.

[0329] The terms "component", "module", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program and / or a computer. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process and / or an execution thread, and a component may be located on a computer and / or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may, for example, communicate through local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system and / or a network, such as the Internet interacting with other systems through signals).

[0330] Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0331] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0332] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0333] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0334] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. If the function is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.

[0335] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: receiving a first reference signal through a first port and sending a second reference signal through a second port, the first port being associated with the second port; Sending first information, where the first information is obtained based on first channel information, which is obtained based on the first reference signal, the first information and second channel information are used for channel estimation, and the second channel information is obtained based on the second reference signal.

2. The method according to claim 1, characterized in that The first port is associated with the second port, comprising: The first port and the second port correspond to the same physical port or logical port.

3. The method according to claim 1 or 2, characterized in that The first port is used to receive an uplink reference signal, and the second port is used to send a downlink reference signal; or, The first port is used to receive a downlink reference signal, and the second port is used to send an uplink reference signal.

4. The method according to any one of claims 1 to 3, characterized in that: The first channel information includes at least one first matrix, the first matrix corresponds to at least one spatial domain vector and multiple frequency domain vectors, the first matrix includes multiple combining coefficients, each combining coefficient is a combining coefficient of a spatial domain vector and a frequency domain vector, and the first information is used to indicate the amplitude and / or phase of at least one combining coefficient in the first matrix.

5. The method according to claim 4, characterized in that The method further comprises: Second information is received, where the second information is used to indicate that the first information is used to indicate an amplitude and / or a phase of at least one combining coefficient in the first matrix.

6. The method according to claim 4 or 5, characterized in that The first information comprises an amplitude and / or a phase of the at least one combining coefficient normalized according to a combining coefficient with a maximum amplitude; The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among all combining coefficients corresponding to the first port; or, The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among all combining coefficients of the first matrix; or, The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among the at least one combining coefficient; or, The maximum amplitude combining coefficient includes the maximum amplitude combining coefficient among all corresponding combining coefficients of multiple ports in a first port set, the multiple ports in the first port set include the first port, and the multiple ports in the first port set all correspond to the first reference signal.

7. The method according to any one of claims 3 to 6, characterized in that: The method further comprises: Send confidence information, the confidence information including one or more of the following: A signal to interference and noise ratio corresponding to the at least one combining coefficient; The signal receiving power corresponding to the at least one combining coefficient; The signal to interference and noise ratio corresponding to all combining coefficients corresponding to the first port; The signal receiving power corresponding to all the combining coefficients corresponding to the first port; The signal to interference and noise ratio of all combined coefficients of the first matrix; The signal receiving power of all the combining coefficients of the first matrix; signal received powers corresponding to all combining coefficients corresponding to a plurality of ports in a first port set, the plurality of ports in the first port set including the first port, the plurality of ports in the first port set all corresponding to the first reference signal; The signal to interference plus noise ratios corresponding to all the combining coefficients corresponding to the multiple ports in the first port set.

8. The method according to claim 7, characterized in that The method further comprises: Receive third information, where the third information is used to indicate the sending of the confidence information.

9. The method according to any one of claims 3 to 8, characterized in that: The signal to interference noise ratio corresponding to the at least one combining coefficient is greater than or equal to a first threshold, or greater than or equal to the first threshold and less than or equal to a second threshold, or less than or equal to the second threshold; or, The signal receiving power corresponding to the at least one combining coefficient is greater than or equal to a first threshold, or greater than or equal to the first threshold and less than or equal to a second threshold, or less than or equal to the second threshold.

10. The method according to claim 9, characterized in that The method further comprises: receiving indication information of the first threshold; and / or, Receive indication information of the second threshold.

11. The method according to any one of claims 4 to 10, characterized in that: The method further comprises: Fourth information is received, where the fourth information is used to indicate a spatial domain vector and a frequency domain vector corresponding to the at least one combining coefficient.

12. The method according to any one of claims 4 to 11, characterized in that: The first information is also used to indicate a spatial domain vector and a frequency domain vector corresponding to the at least one combining coefficient.

13. The method according to any one of claims 1 to 12, characterized in that: The method further comprises: Receive fifth information, where the fifth information is used to indicate a first frame structure and a second frame structure, where the first frame structure and the second frame structure each include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain; A subframe in the first frame structure and a subframe in the second frame structure corresponding to the same time domain unit satisfy: At least one subframe is a special subframe; or, One subframe is an uplink subframe, and the other subframe is a downlink subframe.

14. The method according to claim 13, characterized in that, The first frequency domain resource and the second frequency domain resource correspond to different carriers, or the first frequency domain resource and the second frequency domain resource correspond to different subbands in the same carrier.

15. The method according to claim 13 or 14, characterized in that The first port and the second port correspond to different subframes on the first frequency domain resources, or the first port and the second port correspond to different subframes on the second frequency domain resources.

16. A communication method, characterized in that: include: Sending a first reference signal and receiving a second reference signal, wherein the first reference signal is received by a first port of a first communication device, and the second reference signal is sent by a second port of the first communication device, and the first port is associated with the second port; receiving first information, where the first information is obtained according to first channel information, the first channel information is obtained according to the first reference signal, and the second channel information is obtained according to the second reference signal; Channel estimation is performed according to the first information and the second channel information.

17. The method according to claim 16, characterized in that The first port is associated with the second port, comprising: The first port and the second port correspond to the same physical port or logical port.

18. The method according to claim 16 or 17, characterized in that The first port is used to receive an uplink reference signal, and the second port is used to send a downlink reference signal; or, The first port is used to receive a downlink reference signal, and the second port is used to send an uplink reference signal.

19. The method according to any one of claims 16 to 18, characterized in that: The first channel information includes at least one first matrix, the first matrix corresponds to at least one spatial domain vector and multiple frequency domain vectors, the first matrix includes multiple combining coefficients, each combining coefficient is a combining coefficient of a spatial domain vector and a frequency domain vector, and the first information is used to indicate the amplitude and / or phase of at least one combining coefficient in the first matrix.

20. The method of claim 19, wherein: The method further comprises: Second information is sent, where the second information is used to indicate that the first information is used to indicate an amplitude and / or a phase of at least one combining coefficient in the first matrix.

21. The method according to claim 19 or 20, characterized in that The first information comprises an amplitude and / or a phase of the at least one combining coefficient normalized according to a combining coefficient with a maximum amplitude; The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among all combining coefficients corresponding to the first port; or, The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among all combining coefficients of the first matrix; or, The maximum magnitude combining coefficient includes the maximum magnitude combining coefficient among the at least one combining coefficient; or, The maximum amplitude combining coefficient includes the maximum amplitude combining coefficient among all corresponding combining coefficients of multiple ports in a first port set, the multiple ports in the first port set include the first port, and the multiple ports in the first port set all correspond to the first reference signal.

22. The method according to any one of claims 18 to 21, characterized in that: The method further comprises: receiving confidence information; Determine, according to the confidence information, to perform channel estimation according to the first information and the second channel information; The confidence information includes one or more of the following: A signal to interference and noise ratio corresponding to the at least one combining coefficient; The signal receiving power corresponding to the at least one combining coefficient; The signal to interference and noise ratio corresponding to all combining coefficients corresponding to the first port; The signal receiving power corresponding to all the combining coefficients corresponding to the first port; The signal to interference and noise ratio of all combined coefficients of the first matrix; The signal receiving power of all the combining coefficients of the first matrix; signal received powers corresponding to all combining coefficients corresponding to a plurality of ports in a first port set, the plurality of ports in the first port set including the first port, the plurality of ports in the first port set all corresponding to the first reference signal; The signal to interference plus noise ratios corresponding to all the combining coefficients corresponding to the multiple ports in the first port set.

23. The method of claim 21, wherein: The method further comprises: Send third information, where the third information is used to indicate the sending of the confidence information.

24. The method according to any one of claims 18 to 23, characterized in that: The signal to interference noise ratio corresponding to the at least one combining coefficient is greater than or equal to a first threshold, or greater than or equal to the first threshold and less than or equal to a second threshold, or less than or equal to the second threshold; or, The signal receiving power corresponding to the at least one combining coefficient is greater than or equal to a first threshold, or greater than or equal to the first threshold and less than or equal to a second threshold, or less than or equal to the second threshold.

25. The method of claim 24, wherein: The method further comprises: sending indication information of the first threshold; and / or, Send indication information of the second threshold.

26. The method according to any one of claims 19 to 25, characterized in that: The method further comprises: Send fourth information, where the first indication information is used to indicate a spatial domain vector and a frequency domain vector corresponding to the at least one combining coefficient.

27. The method according to any one of claims 19 to 26, characterized in that: The first information is also used to indicate a spatial domain vector and a frequency domain vector corresponding to the at least one combining coefficient.

28. The method according to any one of claims 18 to 27, characterized in that: The method further comprises: Sending fifth information, where the fifth information is used to indicate a first frame structure and a second frame structure, wherein the first frame structure and the second frame structure each include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain; A subframe in the first frame structure and a subframe in the second frame structure corresponding to the same time domain unit satisfy: At least one subframe is a special subframe; or, One subframe is an uplink subframe, and the other subframe is a downlink subframe.

29. The method of claim 28, wherein: The first frequency domain resource and the second frequency domain resource correspond to different carriers, or the first frequency domain resource and the second frequency domain resource correspond to different subbands in the same carrier.

30. The method according to claim 28 or 29, characterized in that The first port and the second port correspond to different subframes on the first frequency domain resources, or the first port and the second port correspond to different subframes on the second frequency domain resources.

31. A communication method, characterized in that: The method further comprises: Receive fifth information, where the fifth information is used to indicate a first frame structure and a second frame structure, where the first frame structure and the second frame structure each include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain; A subframe in the first frame structure and a subframe in the second frame structure corresponding to the same time domain unit satisfy: At least one subframe is a special subframe; or, One subframe is an uplink subframe, and the other subframe is a downlink subframe.

32. The method of claim 31, wherein: The first frequency domain resource and the second frequency domain resource correspond to different carriers, or the first frequency domain resource and the second frequency domain resource correspond to different subbands in the same carrier.

33. A communication method, characterized in that: The method further comprises: Sending fifth information, where the fifth information is used to indicate a first frame structure and a second frame structure, wherein the first frame structure and the second frame structure each include N subframes, each subframe corresponds to a time domain unit and a frequency domain unit, each subframe in the first frame structure corresponds to a first frequency domain resource, each subframe in the second frame structure corresponds to a second frequency domain resource, and the first frequency domain resource and the second frequency domain resource do not overlap in the frequency domain; A subframe in the first frame structure and a subframe in the second frame structure corresponding to the same time domain unit satisfy: At least one subframe is a special subframe; or, One subframe is an uplink subframe, and the other subframe is a downlink subframe.

34. The method of claim 33, wherein: The first frequency domain resource and the second frequency domain resource correspond to different carriers, or the first frequency domain resource and the second frequency domain resource correspond to different subbands in the same carrier.

35. A communication device, characterized in that: The method comprises a processor configured to execute a computer program or instructions to implement the method according to any one of claims 1 to 34.

36. The device according to claim 35, characterized in that The device further comprises a memory and / or a transceiver, wherein the memory is used to store the computer program or instructions, and the transceiver is used for the device to communicate.

37. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 34 is implemented.

38. A chip, characterized in that: The chip is coupled to a memory, and the chip reads a computer program stored in the memory to execute the method according to any one of claims 1 to 34.

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