A method and device for determining channel information

Abstract

A method and apparatus for determining channel information, wherein the method comprises: after the terminal device determines the first channel information between the terminal device and the network device according to the downlink reference signal from the network device, the feedback information can be determined according to the first channel information, and the feedback information is sent to the network device. The feedback information includes the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P antennas among the M antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the M‑P antennas among the M antennas in the first channel information. In the above method, the terminal device does not need to feed back the complete channel information, and can feed back the difference information and use a smaller measurement reporting overhead so that the network device obtains the complete channel information and improves the performance of uplink and downlink data transmission.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a method and device for determining channel information. Background Art

[0002] In a mobile communication system, the network device needs to obtain the channel information between the terminal device and the network device in order to schedule resources for downlink data transmission. Mobile communication systems are generally divided into time division duplex (TDD) systems and frequency division duplex (FDD) systems. In a TDD system, uplink and downlink transmissions use the same frequency, and the uplink and downlink channels are generally reciprocal, that is, the downlink channel matrix and the uplink channel matrix are transposed of each other. When performing downlink data transmission, the network device needs to determine the corresponding transmission parameters based on the downlink channel information, such as resource scheduling method, modulation and coding method, etc.

[0003] In a TDD system, based on the reciprocity of uplink and downlink channels, network equipment can obtain downlink channel information by measuring the sounding reference signal (SRS) sent by the terminal equipment. However, in a TDD system, some terminal equipment has limited capabilities and cannot use all antennas to send SRS, but can only use part (such as a single) of the antenna to send SRS, resulting in the network equipment being unable to obtain complete downlink channel information. The network equipment is thus unable to determine the resource scheduling method, modulation and coding method, etc. during downlink transmission based on the downlink channel information, which reduces the downlink transmission performance. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a method and apparatus for determining channel information, so as to solve the problem of how a network device acquires complete channel information.

[0005] In a first aspect, the present application provides a channel information determination method, comprising: a terminal device determines, based on a downlink reference signal from a network device, first channel information between the terminal device and the network device; the terminal device determines feedback information based on the first channel information, and sends the feedback information to the network device; wherein the feedback information includes K spatial channel component identifiers, and channel differential information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; the K channel differential information corresponding to the K spatial channel component identifiers is difference information between second channel information and third channel information; the second channel information is the channel information corresponding to P antennas among the M antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to MP antennas among the M antennas in the first channel information; the MP antennas are antennas among the M antennas except the P antennas, M is an integer greater than P, and P is an integer greater than 0.

[0006] In the above method, the terminal device does not need to feed back complete channel information. It can feed back difference information and use a smaller measurement reporting overhead so that the network device can obtain complete channel information and improve the performance of uplink and downlink data transmission.

[0007] In a possible implementation, the channel differential information corresponding to each of the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0008] In a possible implementation, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, which represents a ratio or difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0009] The phase difference value represents the difference between the signal phase in the channel information corresponding to the first antenna and the signal phase in the channel information corresponding to the second antenna; the delay difference value represents the difference between the signal delay in the channel information corresponding to the first antenna and the signal delay in the channel information corresponding to the second antenna; the first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

[0010] In one possible implementation, when the channel differential information includes an amplitude ratio, the feedback information also includes amplitude flip indication information corresponding to the amplitude ratio; when the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; when the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0011] In a possible implementation, the feedback information further includes one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the network device.

[0012] In a second aspect, the present application further provides a communication device, which has the function of implementing any of the methods provided in the first aspect. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0013] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding functions of the terminal device in the method shown above. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and a device such as a network device.

[0014] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0015] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the description of the method provided in the first aspect, which will not be repeated here.

[0016] In a third aspect, the present application provides a channel information determination method, including: a network device measures an uplink reference signal from P antennas of a terminal device to obtain fourth channel information; the fourth channel information is the channel information corresponding to the P antennas, and P is an integer greater than 0; the network device receives feedback information from the terminal device; the network device determines fifth channel information between the network device and the terminal device according to the fourth channel information and the feedback information; wherein the feedback information includes K spatial channel component identifiers, and channel differential information corresponding to each spatial channel component identifier in the K spatial channel component identifiers; K is an integer greater than or equal to 1;

[0017] The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the first channel information is the channel information between all antennas of the terminal device and all antennas of the network device, the MP root antennas are the antennas among the M root antennas except the P root antennas, and M is an integer greater than P.

[0018] In the above method, when the terminal device sends an uplink reference signal through part of the antenna, the network device can determine the complete channel information of the channel between the network device and the terminal device through the feedback difference information in the feedback information sent by the terminal device, thereby improving the performance of uplink and downlink data transmission.

[0019] In a possible implementation, the channel differential information corresponding to each of the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0020] In a possible implementation manner, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna includes one or more of the following:

[0021] an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0022] a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna;

[0023] A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna;

[0024] The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

[0025] In a possible implementation manner, when the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio;

[0026] When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna;

[0027] When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0028] In a possible implementation manner, the feedback information further includes one or more of the following:

[0029] The number of spatial channel components indicates the number of spatial channel components corresponding to the feedback information reported by the terminal device;

[0030] The time offset between the terminal device and the network device.

[0031] In a fourth aspect, the present application further provides a communication device, which has the function of implementing any of the methods provided in the third aspect. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0032] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding functions of the network device in the method shown above. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and a device such as a network device.

[0033] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0034] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the description of the method provided in the first aspect, which will not be repeated here.

[0035] In a fifth aspect, the present application provides a channel information determination method, including: a terminal device determines, based on a downlink reference signal from a network device, channel information between N antennas of the network device and M antennas of the terminal device; the terminal device sends feedback information to the network device based on the channel information between the N antennas and the M antennas; wherein the feedback information is used to indicate difference information between second information and third information; the second information is the channel information between the N antennas and the P antennas determined by the terminal device; the third information is the channel information between the N antennas and the MP antennas in the terminal device determined by the terminal device; the MP antennas are antennas among the M antennas excluding the P antennas, N is an integer greater than 1, M is an integer greater than P, and P is an integer greater than 0.

[0036] In one possible implementation, the feedback information may specifically include: K spatial channel component identifiers, and channel differential information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; wherein the channel differential information corresponding to the i-th spatial channel component identifier among the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0037] In a possible implementation manner, the channel information may also include one or more of the following: signal amplitude; signal phase; signal delay; specifically, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna (the first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas), for example, may include one or more of the following:

[0038] an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0039] a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna;

[0040] The delay difference represents a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna.

[0041] In one possible implementation, when the channel differential information includes an amplitude ratio, the feedback information may also include amplitude flip indication information corresponding to the amplitude ratio; when the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; when the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0042] In a possible implementation, the feedback information further includes one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the network device.

[0043] In a sixth aspect, the present application further provides a communication device, which has the function of implementing any of the methods provided in the fifth aspect. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0044] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding functions of the terminal device in the method shown above. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and a device such as a network device.

[0045] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0046] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the description of the method provided in the first aspect, which will not be repeated here.

[0047] In a seventh aspect, the present application provides a channel information determination method, comprising: a network device measures an uplink reference signal from a terminal device through N antennas to obtain first information; the uplink reference signal is sent through P antennas among the M antennas of the terminal device, and the first information is the channel information between the N antennas and the P antennas; N is an integer greater than 1, M is an integer greater than P, and P is an integer greater than 0; the network device receives feedback information from the terminal device; wherein the feedback information is used to indicate difference information between second information and third information; the second information is the channel information between the N antennas and the P antennas determined by the terminal device; the third information is the channel information between the N antennas determined by the terminal device and the MP antennas in the terminal device; the MP antennas are antennas among the M antennas other than the P antennas;

[0048] The network device determines channel information between the N antennas and the M antennas according to the first information and the feedback information.

[0049] In one possible implementation, the feedback information may specifically include: K spatial channel component identifiers, and channel differential information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; wherein the channel differential information corresponding to the i-th spatial channel component identifier among the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0050] In a possible implementation manner, the channel information may also include one or more of the following: signal amplitude; signal phase; signal delay; specifically, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna (the first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas), for example, may include one or more of the following:

[0051] an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0052] a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna;

[0053] The delay difference represents a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna.

[0054] In one possible implementation, when the channel differential information includes an amplitude ratio, the feedback information may also include amplitude flip indication information corresponding to the amplitude ratio; when the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; when the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0055] In a possible implementation, the feedback information further includes one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the network device.

[0056] In an eighth aspect, the present application further provides a communication device, which has the function of implementing any of the methods provided in the seventh aspect. The communication device can be implemented by hardware, or by executing corresponding software implementation by hardware. The hardware or software includes one or more units or units corresponding to the above functions.

[0057] In a possible implementation, the communication device includes: a processor, the processor is configured to support the communication device to perform the corresponding functions of the network device in the method shown above. The communication device may also include a memory, which may be coupled to the processor and stores the necessary program instructions and data of the communication device. Optionally, the communication device also includes a communication interface, which is used to support communication between the communication device and a device such as a network device.

[0058] In a possible implementation, the communication device includes corresponding functional units, which are respectively used to implement the steps in the above method. The functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0059] In a possible implementation, the structure of the communication device includes a processing unit and a communication unit, and these units can perform corresponding functions in the above method example. For details, please refer to the description of the method provided in the first aspect, which will not be repeated here.

[0060] In a ninth aspect, the present application provides a communication device, comprising a processor, and when the processor executes a computer program or instruction in a memory, the method described in the first aspect, the third aspect, the fifth aspect, or the seventh aspect is executed.

[0061] In a tenth aspect, the present application provides a communication device, comprising a processor and a memory, the memory being used to store computer programs or instructions; the processor being used to execute the computer programs or instructions stored in the memory so that the communication device performs the corresponding method as shown in the first aspect or the third aspect or the fifth aspect or the seventh aspect.

[0062] In the eleventh aspect, the present application provides a communication device, which includes a processor, a memory and a transceiver, wherein the transceiver is used to receive a signal or send a signal; the memory is used to store a computer program or instruction; the processor is used to call the computer program or instruction from the memory to execute the method described in the first aspect or the third aspect or the fifth aspect or the seventh aspect.

[0063] In the twelfth aspect, the present application provides a communication device, comprising a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor; the processor runs the code instructions to execute the corresponding method shown in the first aspect, the third aspect, the fifth aspect, or the seventh aspect.

[0064] In the thirteenth aspect, the present application provides a computer-readable storage medium, which is used to store computer programs or instructions. When a computer reads and executes the computer program or instructions, the method described in the first aspect or the third aspect or the fifth aspect or the seventh aspect is implemented.

[0065] In a fourteenth aspect, the present application provides a computer program product comprising instructions, and when a computer reads and executes the computer program product, the method described in the first aspect, the third aspect, the fifth aspect, or the seventh aspect is implemented.

[0066] In the fifteenth aspect, the present application provides a chip, comprising a processor, wherein the processor is coupled to a memory and is used to execute a computer program or instructions stored in the memory. When the processor executes the computer program or instructions, the method described in the first aspect, the third aspect, the fifth aspect, or the seventh aspect is implemented.

[0067] In a sixteenth aspect, the present application provides a system, comprising the communication device provided in the second aspect and the communication device provided in the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 A schematic diagram of a network architecture applicable to an embodiment of the present application;

[0069] Figure 2 A schematic diagram of a correspondence between antenna and channel information provided in an embodiment of the present application;

[0070] Figure 3 A schematic diagram of a method for determining channel information provided in an embodiment of the present application;

[0071] Figure 4 A schematic diagram of a correspondence between antenna and channel information provided in an embodiment of the present application;

[0072] Figure 5 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0073] Figure 6 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0074] The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0075] The technical solutions of the embodiments of the present application can be applied to various communication systems that adopt time division duplex (TDD) technology, such as: global gystem of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), LTE time division duplex (TDD), fifth generation (5G) system or new radio (NR), etc., without limitation here.

[0076] To facilitate understanding of the embodiments of the present application, first Figure 1 The communication system shown in the figure is used as an example to describe in detail the communication system applicable to the embodiments of the present application. Figure 1The architecture of a possible communication system applicable to the method provided in an embodiment of the present application is shown, and the architecture of the communication system includes a network device and at least one terminal device, wherein: the network device can establish a communication link with at least one terminal device (such as terminal device 1 and terminal device 2 shown in the figure) through beams in different directions. The network device can provide wireless access-related services for the at least one terminal device, and implement one or more of the following functions: wireless physical layer functions, resource scheduling and wireless resource management, quality of service (QoS) management, wireless access control, and mobility management functions. The at least one terminal device can also form a beam to transmit data with the network device. In this embodiment, the network device and at least one terminal device can communicate through a beam.

[0077] It should be noted that Figure 1 The architecture of the communication system shown is not limited to including only the devices shown in the figure, but may also include other devices not shown in the figure, which will not be listed one by one in this application.

[0078] Figure 1 The network system shown can use TDD technology for communication. In a TDD system, uplink and downlink transmissions use the same frequency, and the uplink and downlink channels are generally reciprocal, that is, the downlink channel matrix and the uplink channel matrix are transposed of each other. Assume that Figure 2 As shown, taking the example that the network device includes N antennas and the terminal device includes M antennas, the channel information between the network device and the terminal device may be an M×N channel matrix. For example, the channel matrix H may satisfy the following form:

[0079]

[0080] Among them, h i-j Represents the channel information between the i-th antenna of the terminal device and the j-th antenna of the network device, where i is in the range of 1≤i≤M and j is in the range of 1≤j≤N.

[0081] It should be noted that, in the embodiment of the present application, unless otherwise specified, the channel information between the antenna i of the terminal device and the antenna j of the network device is recorded as h in the following description. i-j As can be seen from the above channel matrix, the complete channel information between the network device and the terminal device may include the channel information between all antennas of the network device and all antennas of the terminal device.

[0082] In a TDD system, a network device can measure an uplink reference signal (such as a sounding reference signal (SRS)) sent by a terminal device to obtain channel information between the network device and the terminal device. However, due to the limited capabilities of the terminal device, it may not be possible to use all antennas to send uplink reference signals, but only some (such as a single) antennas to send uplink reference signals. In this case, the network device cannot obtain complete channel information. To this end, the present application provides a method that can enable the network device to obtain channel information between the network device and the terminal device when the terminal device does not use all antennas to send uplink reference signals, which will be described in detail later.

[0083] References to "one embodiment" or "some embodiments" etc. described in the embodiments of the present application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0084] In the present application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0085] The terminal device in the embodiments of the present application may refer to user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile communication network (PLMN), etc., and the embodiments of the present application are not limited to this.

[0086] Exemplarily, the terminal device may include: a radio resource control (RRC) signaling interaction module, a media access control (MAC) signaling interaction module, and a physical (PHY) signaling interaction module. Among them, the RRC signaling interaction module may be: a module used by the network device and the terminal device to send and receive RRC signaling. The MAC signaling interaction module may be: a module used by the network device and the terminal device to send and receive MAC control element (CE) signaling. PHY signaling and data may be: a module used by the network device and the terminal device to send and receive uplink control signaling or downlink control signaling, uplink and downlink data, or downlink data.

[0087] The network device in the embodiment of the present application can be a device for communicating with a terminal device. The network device can be a base station (Base Transceiver Station, BTS) in a GSM system or CDMA, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (Evolutional NodeB, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and an access network device in a future 5G network (such as a gNB) or an access network device in a future evolved PLMN network, etc., and the embodiments of the present application are not limited.

[0088] Exemplarily, the network device may also include: an RRC signaling interaction module, a MAC signaling interaction module, and a PHY signaling interaction module.

[0089] In some deployments, the network device may include a centralized unit (CU) and a distributed unit (DU). The network device may also include an active antenna unit (AAU). The CU implements some functions of the network device, and the DU implements some functions of the network device. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. The AAU implements some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or by the DU+AAU. It is understandable that the network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU may be classified as a network device in an access network (radio access network, RAN), or the CU may be classified as a network device in a core network (core network, CN), which is not limited in this application.

[0090] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0091] In the embodiments of the present application, the interaction between a terminal device and a network device is taken as an example for explanation. The method provided in the embodiments of the present application can also be applied to the interaction between other execution entities, such as the interaction between a terminal device chip or module and a chip or module in a network device. When the execution entity is a chip or module, reference can be made to the description in the embodiments of the present application and no further details will be given here.

[0092] The main idea of ​​the present application is that when the terminal device sends an uplink reference signal only through part of the antennas, the network device can measure the uplink reference signal sent by the terminal antenna through part of the antennas, thereby obtaining partial channel information of the channel. The terminal device uses all antennas to measure the downlink reference signal sent by the network device through all antennas, thereby obtaining the complete channel information of the channel. The terminal device then feeds back a part of the obtained complete channel information to the network device as difference information. The network device can determine the complete channel information based on the difference information and the partial channel information obtained by its own measurement. Among them, the difference information fed back by the terminal device can be the difference information between the channel information corresponding to at least one of the antennas that send uplink reference downlink in the complete channel information and the channel information corresponding to at least one of the antennas that do not send uplink reference downlink in the complete channel information.

[0093] Combined with the previous description, such as Figure 3 FIG. 1 is a schematic diagram of a method for determining channel information provided by an embodiment of the present application. The method can be applied to a communication system using TDD technology. Figure 3 In the process shown, the network device includes N antennas and the terminal device includes M antennas as an example for description. For other cases, please refer to the description in the embodiment of the present application, which will not be repeated here. Wherein, N is an integer greater than 1, and M is an integer greater than 1. Figure 3 , the method comprising:

[0094] Step 301: The network device sends measurement configuration information to the terminal device.

[0095] The measurement configuration information may include measurement resource configuration information and measurement result reporting configuration information.

[0096] It should be noted that before the network device sends a downlink reference signal to the terminal device, the terminal device needs to determine in which resources the network device sends the downlink reference signal. To this end, the network device can indicate to the terminal device the relevant information of the resources carrying the downlink reference signal by measuring the resource configuration information.

[0097] As mentioned above, the measurement resource configuration information may include relevant information of the resources that the terminal device needs to measure. For example, the transmission period of the resources, the type of resources, etc. The type of resources may include but is not limited to a combination of one or more of the following resources: channel state information reference signal (CSI-RS) resources; synchronization signal broadcast channel block (Synchronization Signal and PBCH Block, SSB) resources.

[0098] After the terminal device measures the resources carrying the downlink reference signal, it can feed back the measurement result to the network device. The network device can report configuration information through the measurement result to instruct the terminal device which information to report.

[0099] For example, the measurement result reporting configuration information may include information such as reporting period, reporting content (reportQuantity), etc. The reporting content may include one or more of the following: index of measured resource, index of antenna, index of spatial path / spatial channel component, index of frequency subband, channel difference information, etc. The channel difference information refers to the difference information between channels corresponding to different antennas.

[0100] Step 302: The terminal device sends an uplink reference signal to the network device.

[0101] The uplink reference signal may include but is not limited to signals such as SRS, etc. The network device may measure the uplink reference signal sent by the terminal device, thereby obtaining corresponding channel information according to the measurement result.

[0102] The terminal device may use P antennas among the M antennas to send uplink reference signals. P is an integer less than M and greater than 0.

[0103] In this step, the terminal device uses only part of the antennas to send the uplink reference signal, resulting in the network device being unable to determine the complete channel information. For example, assume that N is equal to 2 and M is equal to 2. The terminal device sends the SRS to the network device through antenna 1, and the network device receives the SRS through antenna 1 and antenna 2. The network device can obtain the channel information h between the antenna 1 of the terminal device and the antenna 1 of the network device by measuring the SRS sent by the terminal device. 1-1 , and the channel information h between the antenna 1 of the terminal device and the antenna 2 of the network device 1-2 , and the channel information h between the antenna 2 of the terminal device and the antenna 1 of the network device 2-1 , and the channel information h between the antenna 2 of the terminal device and the antenna 2 of the network device 2-2 Still unknown.

[0104] Combined with the above description, the channel information H measured by the network device DL The following formula can be satisfied:

[0105]

[0106] NA indicates that the information was not obtained.

[0107] It should be noted that, in the embodiment of the present application, unless otherwise specified, the channel information between the antenna i of the terminal device and the antenna j of the network device is recorded as h in the following description. i-jThe complete channel information between the network device and the terminal device may include channel information between all antennas of the network device and all antennas of the terminal device.

[0108] It should be noted that the channel between the network device and the terminal device is composed of one or more spatial paths. The signals from each transmitting antenna to each receiving antenna all reach the receiving antenna through the same set of spatial paths. For example, Figure 4 As shown in the figure, assuming that the channel between the network device and the terminal device includes three spatial paths, namely path 1, path 2 and path 3, then h in the previous example 1-1 、h 1-2 、h 2-1 and h 2-2 are composed of these three spatial paths. 1-1 For example, the uplink reference signal sent from the antenna 1 of the terminal network device to the antenna 1 of the network device reaches the antenna 1 of the terminal device through three spatial paths. The signal will produce a certain amplitude and phase deformation after passing through each path, which can be regarded as the impact of the spatial path on the signal, that is, the channel characteristics of the spatial path. The channel characteristics of each path are superimposed to form the channel characteristics of the entire channel between the antenna 1 of the terminal network device and the antenna 1 of the network device. Therefore, the channel characteristics on a spatial path can be regarded as a spatial channel component, and the channel information between the two antennas is the superposition of each spatial channel component.

[0109] Combined with the previous description, it is assumed that the spatial channel components between the antenna 1 of the terminal network device and the antenna 1 of the network device are Then h 1-1 It can be expressed as: For other situations, please refer to the above description and will not be repeated here.

[0110] Step 303: The network device measures the uplink reference signal from the terminal device to obtain fourth channel information.

[0111] As mentioned above, when the terminal device sends an uplink reference signal through P antennas, the network device can determine the channel information corresponding to the P antennas of the terminal device.

[0112] It should be noted that the channel information corresponding to the P antennas may refer to the sum of the channel information between each of the P antennas of the terminal device and the N antennas of the network device. For example, P is equal to 1, and N is equal to 2. The terminal device sends an uplink reference signal through antenna 1. At this time, the fourth channel information obtained by the network device, that is, the channel information corresponding to the P antennas, may include the channel information between antenna 1 of the terminal device and antenna 1 of the network device, and the channel information between antenna 1 of the terminal device and antenna 2 of the network device.

[0113] For another example, the channel information between the network device and the terminal device may be an M×N channel matrix. When the terminal device sends an uplink reference signal through P antennas, the channel matrix H corresponding to the fourth channel information obtained by the network device is P It can be expressed as follows:

[0114]

[0115] Among them, NA means that the corresponding channel information is not obtained. From the above formula (3), it can be seen that in the channel matrix corresponding to the fourth channel information, when the value range of i is P+1≤i≤M and the value range of j is 1≤j≤N, the corresponding channel information h i-j is NA.

[0116] It should be noted that steps 301 to 303 are optional steps in the embodiment of the present application. The above steps are described here only for the purpose of describing the application scenario of the embodiment of the present application and do not represent a limitation on the embodiment of the present application.

[0117] Step 304: The terminal device determines first channel information between the terminal device and the network device according to a downlink reference signal from the network device.

[0118] Among them, the downlink reference signal includes but is not limited to a synchronization signal broadcast channel block (SynchronizationSignal and PBCH Block, SSB), a channel state information downlink signal (channel state informationreference signal, CSI-RS) and other signals.

[0119] It should be noted that when the network device sends a downlink reference signal, all antennas of the network device may be used to send the downlink reference signal, so that the terminal device can determine the complete channel information between the terminal device and the network device, that is, the first channel information.

[0120] Step 305: The terminal device determines feedback information according to the first channel information, and sends the feedback information to the network device.

[0121] In this embodiment of the present application, the feedback information may include the following:

[0122] K spatial channel component identifiers; K is an integer greater than or equal to 1.

[0123] Channel difference information corresponding to each of the K spatial channel component identifiers.

[0124] Among them, each spatial channel component identifier in the K spatial channel component identifiers can correspond to a spatial channel component. As mentioned above, multiple spatial channel components may be included between the terminal device and the network device. For this reason, the spatial channel component identifier can enable the network device to determine which spatial channel component each channel differential information reported by the terminal device corresponds to. The spatial channel component identifier can also be called the identifier of the spatial path or the identifier of the time domain tap. The present application does not limit the specific name. Any name with the same technical effect as the spatial channel component identifier in the present application is within the protection scope of the present application. The value of K can be indicated to the terminal device by the network device, for example, by radio resource control (Radio Resource Control, RRC) signaling or medium access control-control unit (Medium Access Control-Control Element, MAC-CE) information or downlink control information (Downlink Control Information, DCI) sent to the terminal device. Or reported by UE, for example, reported to the network device through UE capabilities. It can also be calculated according to certain rules, such as a value calculated based on the number of antennas / antenna ports.

[0125] In the embodiment of the present application, the identification of the spatial channel component can be fed back in the following manner:

[0126] The first spatial channel component identifier among the K spatial channel component identifiers is fed back using X bits; the first spatial channel component among the K spatial channel component identifiers refers to the spatial channel component with the shortest delay or the earliest time among the spatial channel components to be reported. The X bits represent the delay corresponding to the spatial channel component, or the identifier of the corresponding time domain tap, for example, X=0 represents the first time domain tap, and X=10 represents the 11th time domain tap.

[0127] The identifier of the second spatial channel component among the K spatial channel component identifiers is fed back using Y bits; Y can be equal to X, and is also used to indicate the time delay corresponding to the spatial channel component, or the identifier of the corresponding time domain tap. Y ​​can also be less than X, in which case Y indicates the time delay corresponding to the spatial channel component, the difference between the time delay corresponding to the previous / first spatial channel component, or the interval between the time domain tap corresponding to the spatial channel component and the time domain tap corresponding to the previous / first spatial channel component, or the difference between the identifiers of the time domain taps, etc.

[0128] How to feed back the identifier of the third spatial channel component among the K spatial channel component identifiers to the identifier of the Kth spatial channel component can be deduced in the same way, which will not be described in detail here.

[0129] The values ​​of X and Y can be indicated to the terminal device by the network device, for example, by sending RRC signaling or MAC-CE information or DCI to the terminal device. Or they can be reported by the terminal device, for example, by reporting the terminal device capabilities to the network device. They can also be calculated according to certain rules, for example, values ​​calculated according to the number of antennas / antenna ports.

[0130] In the embodiment of the present application, for each spatial channel component, the channel differential information corresponding to the spatial channel component fed back by the terminal device may refer to the channel differential information of the channel information corresponding to the first part of the antennas of the terminal device and the channel differential information corresponding to the antennas other than the first part of all the antennas of the terminal device. Optionally, it is also possible not to distinguish between the various spatial channel components, and directly feed back the channel differential information of the complete channel (i.e., the channel in which all channel components are combined).

[0131] The first part of the antennas of the terminal device may refer to the first antenna, or the last antenna, or the first two antennas, or the last two antennas of the terminal device, which is not limited in the embodiments of the present application. The first part of the antennas of the terminal device may also refer to the antennas that send uplink reference signals. The terminal device feeds back the channel difference information between the channel information corresponding to other antennas and the channel information corresponding to the first part of the antennas. Or conversely, the terminal device feeds back the channel difference information between the channel information corresponding to the first part of the antennas and the channel information corresponding to other antennas.

[0132] In combination with the foregoing description, in an embodiment of the present application, the K channel difference information corresponding to the K spatial channel component identifiers in the feedback information may be difference information between the second channel information and the third channel information.

[0133] Among them, the second channel information is the channel information corresponding to the P antennas among the M antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP antennas among the M antennas in the first channel information; the MP antennas are antennas among the M antennas except the P antennas. The second channel information and the third channel information are a spatial channel component, or a complete channel (i.e., a channel in which all channel components are combined). The value of P can be indicated to the terminal device through a network device, for example, by RRC signaling or MAC-CE information or DCI. Or it can be reported by the terminal device, for example, reported to the network device through the terminal device capability. It can also be calculated according to certain rules, such as a value calculated based on the number of antennas / number of antenna ports.

[0134] For example, assuming that there is only one spatial path, that is, only one spatial channel component, K is equal to 1. When the network device includes 4 antennas and the terminal device includes 4 antennas, the first channel information determined by the terminal device may include information as shown in Table 1. In Table 1, h i-j Represents the channel information between antenna i of the terminal device and antenna j of the network device, where 1≤i≤4, 1≤j≤4.

[0135] Table 1

[0136]

[0137] Assuming that the terminal device uses antenna 1 to send an uplink reference signal, the network device can determine the information in the first row of Table 1 by measuring the uplink reference signal, and the information in the following three rows cannot be obtained by measurement. At this time, the terminal device can feedback the difference information between the information in the first row of Table 1 and the information in the following three rows.

[0138] In conjunction with Table 1, in the embodiment of the present application, the channel difference information reported by the terminal device, that is, the difference information between the second channel information and the third channel information may include one or more of the following:

[0139] h 1-1 With h 2-1 The difference information of 1-1 With h 3-1 The difference information of 1-1 With h 4-1 difference information;

[0140] h 1-2 With h 2-2 The difference information of 1-2 With h 3-2 The difference information of 1-1 With h 4-2 difference information;

[0141] h 1-3 With h 2-3 The difference information of 1-3 With h 3-3 The difference information of 1-3 With h 4-3 difference information;

[0142] h 1-4 With h 2-4 The difference information of 1-4 With h 3-4 The difference information of 1-4 With h 4-4 difference information.

[0143] It should be noted that the above is only an example, and in actual applications, the feedback channel difference information can be determined according to actual conditions. For example, when the terminal device has four antennas, the difference information between the channel information corresponding to the second, third, and fourth antennas and the channel information corresponding to the first antenna can be fed back.

[0144] The terminal device can also perform differential feedback based on odd and even numbers. For example, when the terminal device has 8 antennas, the terminal device feeds back the channel differential information of the channel information of the 3rd, 5th, and 7th antennas and the channel differential information of the channel information of the 1st antenna, and the channel differential information of the channel information of the 4th, 6th, and 8th antennas and the channel differential information of the channel information of the 2nd antenna. Whether to perform feedback based on odd and even numbers can be indicated to the terminal device by the network device, for example, by RRC signaling or MAC-CE information or DCI sent to the terminal device. Or it can be reported by the terminal device, for example, by reporting to the network device through the terminal device capability. It can also be a value calculated based on the number of antennas.

[0145] The terminal device can also perform differential feedback based on polarization direction (for example, based on the polarization direction of the terminal device antenna). For example, when the terminal device has 8 antennas, the antennas corresponding to the first polarization direction are antenna 1, antenna 2, antenna 3, and antenna 4, and the antennas corresponding to the second polarization direction are antenna 5, antenna 6, antenna 7, and antenna 8. Then the terminal device can feedback the channel difference information between the channel information of antenna 2, antenna 3, and antenna 4 and the channel information of antenna 1, and the channel difference information between the channel information of antenna 6, antenna 7, and antenna 8 and the channel information of antenna 5. Whether to perform feedback based on polarization direction can be indicated to the terminal device by the network device, for example, by RRC signaling, MAC-CE information, or DCI sent to the terminal device. Or it can be reported by the terminal device, for example, by reporting to the network device through the terminal device capability. It can also be a value calculated based on the number of antennas.

[0146] The protocol may also support multiple feedback methods. The specific feedback method may be indicated by the network device to the terminal device, such as by RRC signaling, MAC-CE information or DCI sent to the terminal device. Or it may be reported by the terminal device, such as reporting the terminal device capability to the network device. It may also be a value calculated based on the number of antennas.

[0147] Each antenna of a network device corresponds to a set of channel differential information. The terminal device can only feedback the channel differential information corresponding to the antenna of one network device, such as the channel differential information corresponding to the first antenna of the network device. The terminal device can also feedback the channel differential information corresponding to the antennas of some network devices, such as the channel differential information corresponding to the two antennas of the previous network device. Or the antennas of all network devices are grouped, one or two antennas are selected from each group, and the channel differential information corresponding to the one or two antennas is fed back. The number of groups, or the size of the group (the number of antennas included) can be specified by the protocol by default. It can also be indicated by the network device to the terminal device, such as sent to the terminal device through RRC signaling or MAC-CE information or DCI. Or reported by the terminal device, such as reported to the network device through the terminal device capability. It can also be a value calculated based on the number of antennas. The value of the number of groups or the size of the group can be one or more of 1, 2, 4, 6, 8, 12, 16, 32, 64, that is, the value range of the number of groups or the size of the group can be {1, 2, 4, 6, 8, 12, 16, 32, 64} or a subset thereof.

[0148] The terminal device may also provide feedback by polarization direction (for example, according to the polarization direction of the terminal device antenna). For example, for two polarization directions, the channel differential information corresponding to the antenna of a network device under each polarization direction is fed back, such as the channel differential information corresponding to the first antenna of the network device corresponding to each polarization direction (such as the antenna with the smallest antenna index). The terminal device may also feedback the channel differential information corresponding to the antennas of all network devices. Whether to provide feedback by polarization direction may be indicated by the network device to the terminal device, such as by RRC signaling, MAC-CE information or DCI sent to the terminal device. Or it may be reported by the terminal device, such as by reporting the terminal device capability to the network device. It may also be a value calculated based on the number of antennas.

[0149] Further, in an embodiment of the present application, the channel information between the two antennas may include one or more combinations of signal amplitude, signal phase, and signal delay. Assume that the first antenna is any antenna in the P antennas, and the second antenna is any antenna in the MP antennas. The channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna may include one or more of the following:

[0150] An amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0151] A phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna;

[0152] The delay difference represents the difference between the signal delay in the channel information corresponding to the first antenna and the signal delay in the channel information corresponding to the second antenna.

[0153] For example, assuming that there is only one spatial path, that is, there is only one spatial channel component, K is equal to 1. The network device includes 4 antennas, the terminal device includes 4 antennas, the channel information between two antennas includes signal amplitude and signal phase, and the first channel information determined by the terminal device includes information as shown in Table 2.

[0154] Table 2

[0155]

[0156] Combined with Table 1, it can be seen from Table 2 that the channel information h between the antenna 1 of the terminal device and the antenna 1 of the network device is 1-1 Including: signal amplitude 1.04, signal phase -1.56.

[0157] Channel information h between antenna 2 of the terminal device and antenna 1 of the network device 2-1 Including: signal amplitude 0.97, signal phase 1.62.

[0158] Channel information h between antenna 3 of the terminal device and antenna 1 of the network device 3-1 Including: signal amplitude 1.04, signal phase 1.60.

[0159] Channel information h between antenna 4 of the terminal device and antenna 1 of the network device 4-1 Including: signal amplitude 0.97, signal phase -1.61.

[0160] The last three rows in Table 1 correspond to the last three rows in Table 2, and the details are not repeated here.

[0161] To this end, in the above example, the channel differential information fed back by the terminal device may include: 1-1 With h 2-1 The difference information, h 1-1 With h 3-1 The difference information and h 1-1 With h 4-1 Specifically, it may be information as shown in Table 3 or Table 4.

[0162] Table 3

[0163] Amplitude ratio Phase difference 0.93 -3.11 1 -3.12 0.93 0.05

[0164] In Table 3, h 1-1 With h 2-1 The difference information includes: 1-1The signal amplitude and h 2-1 The amplitude ratio of the signal amplitude is 0.93, h 1-1 The signal phase and h 2-1 The phase difference of the signal phase is -3.11; h 1-1 With h 3-1 The difference information includes: 1-1 The signal amplitude and h 3-1 The amplitude ratio of the signal amplitude in the middle is 1, h 1-1 The signal phase and h 3-1 The phase difference of the signal phase is -3.12; h 1-1 With h 4-1 The difference information includes: 1-1 The signal amplitude and h 4-1 The amplitude ratio of the signal amplitude is 0.93, h 1-1 The signal phase and h 4-1 The phase difference of the signal phase is 0.05.

[0165] Table 4

[0166] Amplitude difference Phase difference 0.07 -3.11 0 -3.12 0.07 0.05

[0167] In Table 4, h 1-1 With h 2-1 The difference information includes: 1-1 The signal amplitude and h 2-1 The amplitude difference of the signal amplitude is 0.07, h 1-1 The signal phase and h 2-1 The phase difference of the signal phase is -3.11; h 1-1 With h 3-1 The difference information includes: 1-1 The signal amplitude and h 3-1 The amplitude difference of the signal amplitude in 0,h 1-1 The signal phase and h 3-1 The phase difference of the signal phase is -3.12; h 1-1 With h 4-1 The difference information includes: 1-1 The signal amplitude and h 4-1 The amplitude difference of the signal amplitude is 0.07, h 1-1 The signal phase and h 4-1 The phase difference of the signal phase is 0.05.

[0168] It should be noted that when the channel differential information fed back by the terminal device is the information shown in Table 3 or Table 4, the network device can determine the channel information between the antenna 1 of the network device and the antenna 2, antenna 3 and antenna 4 of the terminal device according to the information shown in Table 3 or Table 4, that is, determine h 2-1 、h 3-1and h 4-1 .

[0169] Accordingly, if the terminal device does not feedback h 1-2 Respectively with h 2-2 、h 3-2 and h 4-2 The difference information between them can be used by network devices 1-1 Respectively with h 2-1 、h 3-1 and h 4-1 The difference information between 1-2 Respectively with h 2-2 、h 3-2 and h 4-2 The difference between them can be used to determine h 2-2 、h 3-2 and h 4-2 .

[0170] Similarly, network devices can 1-1 Respectively with h 2-1 、h 3-1 and h 4-1 The difference information between 1-3 Respectively with h 2-3 、h 3-3 and h 4-3 The difference between them can be used to determine h 2-3 、h 3-3 and h 4-3 . Network devices can be h 1-1 Respectively with h 2-1 、h 3-1 and h 4-1 The difference information between 1-4 Respectively with h 2-4 、h 3-4 and h 4-4 The difference between them can be used to determine h 2-4 、h 3-4 and h 4-4 .

[0171] The quantization range of the amplitude difference / amplitude ratio can be 0 to x, where x can be any value in the set {0.5, 1, 1.5, 2, 2.5, 3}. x can also be other values. The quantization step size is x / y, where y is the number of different values ​​that can be fed back, and y can be any one in the set {2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8092}, or any one minus z. z can be 1 or 2 or 3 or 4, or other integers.

[0172] The quantization range of the phase difference can be 0 to p, where p can be π, or π / m, where m can be one of 1, 2, 3, and 4. The quantization range can also be offset by the above range, for example, the above range as a whole minus π / n, where n can be one of the set {1, 2, 3, 4}. The quantization step size is p / y, where y is the number of different values ​​that can be fed back, and y can be any one of the set {2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8092}, or any one minus z. z can be 1 or 2 or 3 or 4, or other integers.

[0173] In a possible implementation, when the channel differential information includes an amplitude ratio, the feedback information may also include amplitude flip indication information corresponding to the amplitude ratio. When the amplitude ratio determined by the terminal device exceeds the quantization range, the quantization error will be large. Therefore, the terminal device may feed back the reciprocal of the amplitude ratio so that the feedback amplitude ratio is always within the quantization range. For example, the quantization range of the amplitude ratio is 0 to 1. When the amplitude ratio calculated by the terminal device is 2, the reciprocal of the amplitude ratio 0.5 is fed back so that the feedback amplitude ratio does not exceed the quantization range.

[0174] In an embodiment of the present application, when the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; when the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0175] For example, the amplitude flip indication information includes 1 bit, which is used to indicate whether a flip occurs. For example, when the value of the amplitude flip indication information is 0, it indicates that no flip occurs, and the terminal device feeds back the original value of the amplitude ratio. The value of the amplitude flip indication information is 1, which indicates that a flip occurs, and the feedback amplitude ratio is the reciprocal of the original value. Or conversely, the value of the amplitude flip indication information is 1, which indicates that no flip occurs, and the terminal device feeds back the original value of the amplitude ratio. The value of the amplitude flip indication information is 0, which indicates that a flip occurs, and the feedback amplitude ratio is the reciprocal of the original value. For each amplitude ratio, the terminal device can feed back a corresponding amplitude flip indication information.

[0176] In an embodiment of the present application, the feedback information may also include other information. In a possible implementation, the feedback information may also include one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the network device.

[0177] Among them, there may be many spatial paths in the channel between the terminal device and the network device, corresponding to many spatial channel components, but the signal energy on most of the spatial channel components is very weak. For these spatial channel components, it is not necessary to feedback the corresponding channel differential information. Therefore, the terminal device can first determine which spatial channel components or spatial paths corresponding to the channel differential information to feedback.

[0178] The number of spatial channel components of the channel differential information that needs to be fed back may be specified by the protocol by default, or may be indicated by the network device to the terminal device, for example, the network device sends the number of spatial channel components to the terminal device via RRC signaling or MAC-CE information or DCI.

[0179] Optionally, the number of spatial channel components may also be a value determined by the terminal device, and the terminal device reports the number of spatial channel components to the network device. The number of spatial channel components may also be dynamically calculated by the terminal device, and the number of spatial channel components reported by the terminal device may be different each time. If the number of spatial channel components is dynamically determined by the terminal device itself, the terminal device needs to report the number of spatial channel components to the network device so that the network device can determine the channel differential information corresponding to several spatial channel components reported by the terminal device. For example, in the reporting format, a field is used to indicate the number of spatial channel components reported. The number of spatial channel components may also be reported to the network device by the terminal device through the terminal capability reporting process.

[0180] The time of the terminal device and the network device may not be completely aligned, resulting in the i-th spatial channel component fed back by the terminal device being determined by the network device as the i+k-th spatial channel component. k is the time offset between the two. In order to ensure that the network device correctly determines each fed back spatial channel component, the terminal device can feed back the time offset between the terminal device and the network device to the network device.

[0181] For example, the terminal device can feedback an absolute time, or feedback an integer value k, representing k time units, which time unit can specifically refer to a sampling time interval, for example, a Ts, Ts = 1 / N / SCS, where N is the number of points used, which can be any one of {128, 256, 512, 1024, 2048, 4096, 8092}. SCS is the subcarrier spacing used, which can be any one of {15000, 30000, 60000, 120000, 240000}. The terminal device can also feedback the identifier or delay of the first spatial channel component corresponding to the antenna that sends the uplink reference signal, or the time or sampling point identifier used, for the network device to calculate its time offset with the terminal device. The time offset can be one for each spatial channel component, or only one for all spatial channel components, which is not limited in the embodiments of the present application.

[0182] The above measurement method can be used to measure the current cell, or to perform cross-cell measurement, that is, to measure the quality of other cells. It can also be used for cross-frequency measurement, that is, to measure other channels / frequency points / frequency.

[0183] Step 306: The network device receives feedback information from the terminal device, and determines fifth channel information between the network device and the terminal device according to the fourth channel information and the feedback information.

[0184] The fifth channel information determined by the network device is the channel information between all antennas of the network device and all antennas of the terminal device, and is the complete channel information between the network device and the terminal device.

[0185] How the network device determines the fifth channel information according to the fourth channel information and the feedback information is not limited in this embodiment of the present application and will not be described in detail here.

[0186] Through the method provided in this embodiment, the network device can obtain more accurate channel information with a smaller measurement reporting overhead, thereby improving the performance of uplink and downlink data transmission.

[0187] It should be noted that after the network device determines the fifth channel information, it can calculate the best rank indicator (RI) and precoding matrix (PMI) based on the fifth channel information. RI is an identifier of the rank of the channel matrix, which is used to indicate the number of data streams that the channel can support. For example, when RI is 2, it means that the downlink channel of the terminal device supports 2-stream transmission. PMI is an identifier of the precoding matrix. The protocol specifies multiple precoding matrices (or codebooks). The network device can select an optimal precoding matrix based on the fifth channel information and perform downlink data transmission based on the precoding matrix.

[0188] Combined with the above description, the above process is described below through a specific embodiment. For the convenience of description, the channel information between the antenna i of the terminal device and the antenna j of the network device is denoted as h i-j .

[0189] For example, assuming that K is equal to 1, that is, the channel between the network device and the terminal device includes a spatial path or spatial channel component, the terminal device includes 4 antennas, and the network device includes 4 antennas. The network device measures the uplink reference signal sent by the terminal device through antenna 1, and the fourth channel information obtained includes information between antenna 1 of the terminal device and antenna 1, antenna 2, antenna 3 and antenna 4 of the network device, that is, including h 1-1 、h 1-2 、h 1-3 and h 1-4 For example, it can be shown in Table 5.

[0190] Table 5

[0191]

[0192] Furthermore, the terminal device obtains the first channel information by measuring the downlink reference signal sent by the network device through all antennas, which can be as shown in the previous Table 2.

[0193] The feedback information determined by the terminal device may include h 1-1 With h 2-1 The difference information, h 1-1 With h 3-1 The difference information, h 1-1 With h 4-1 The specific information may be the information shown in Table 4.

[0194] After the network device obtains the feedback information, it can determine h based on the feedback information. 2-1 、h 3-1 and h 4-1 .

[0195] Network devices can also use feedback information as h 1-2 Respectively with h 2-2 、h 3-2 and h 4-2 The difference between them can be used to determine h 2-2 、h 3-2 and h 4-2 ; The feedback information is used as h 1-3 Respectively with h 2-3 、h 3-3 and h 4-3 The difference between them can be used to determine h 2-3 、h 3-3 and h 4-3 ; The feedback information is used as h 1-4 Respectively with h 2-4 、h 3-4 and h 4-4 The difference between them can be used to determine h 2-4 、h 3-4 and h 4-4 .

[0196] Finally, the fifth channel information determined by the network device according to the fourth channel information and the feedback information may be as shown in Table 6.

[0197] Table 6

[0198]

[0199]

[0200] The above are just examples, and other situations will not be elaborated.

[0201] The various embodiments described herein may be independent solutions or may be combined according to internal logic, and all of these solutions fall within the protection scope of this application.

[0202] It can be understood that in the above-mentioned method embodiments, the methods and operations implemented by the terminal device can also be implemented by components that can be used for the terminal device (such as chips or circuits), and the methods and operations implemented by the network device can also be implemented by components that can be used for the network device (such as chips or circuits).

[0203] In the embodiments provided by the present application, the methods provided by the embodiments of the present application are introduced from the perspective of interaction between various devices. In order to implement the functions in the methods provided by the embodiments of the present application, the terminal device and the network device may include a hardware structure and / or a software module to implement the functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function in the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0204] 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.

[0205] Same as above idea, Figure 5 As shown, the embodiment of the present application also provides a device 500 for implementing the functions of the terminal device or network device in the above method. For example, the device can be a software module or a chip system. In the embodiment of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices. The device 500 may include: a processing unit 501 and a communication unit 502.

[0206] In the embodiment of the present application, the communication unit may also be referred to as a transceiver unit, and may include a sending unit and / or a receiving unit, which are respectively used to execute the sending and receiving steps of the terminal device or network device in the above method embodiment.

[0207] The following, combined Figures 5 and 6 The communication device provided in the embodiment of the present application is described in detail. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the contents not described in detail can be referred to the method embodiment above, and will not be repeated here for the sake of brevity.

[0208] In one possible design, the device 500 can implement the steps or processes executed by the terminal device or network device in the above method embodiment, which are described below respectively.

[0209] For example, when the apparatus 500 implements Figure 3 The functions of the terminal equipment in the process shown are:

[0210] The processing unit 501 is configured to determine first channel information between a terminal device and the network device according to a downlink reference signal from the network device; and determine feedback information according to the first channel information;

[0211] The communication unit 502 is configured to send the feedback information to the network device;

[0212] The feedback information includes K spatial channel component identifiers and channel differential information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; the K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the MP root antennas are antennas among the M root antennas except the P root antennas, M is an integer greater than P, and P is an integer greater than 0.

[0213] In the above method, the terminal device does not need to feed back complete channel information. It can feed back difference information and use a smaller measurement reporting overhead so that the network device can obtain complete channel information and improve the performance of uplink and downlink data transmission.

[0214] In a possible implementation, the channel differential information corresponding to each of the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0215] In a possible implementation, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, which represents a ratio or difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0216] The phase difference value represents the difference between the signal phase in the channel information corresponding to the first antenna and the signal phase in the channel information corresponding to the second antenna; the delay difference value represents the difference between the signal delay in the channel information corresponding to the first antenna and the signal delay in the channel information corresponding to the second antenna; the first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

[0217] In one possible implementation, when the channel differential information includes an amplitude ratio, the feedback information also includes amplitude flip indication information corresponding to the amplitude ratio; when the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; when the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0218] In a possible implementation, the feedback information further includes one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the network device.

[0219] For example, when the apparatus 500 implements Figure 3 The functions of the terminal equipment in the process shown are:

[0220] The communication unit 502 is configured to measure uplink reference signals from P antennas of a terminal device to obtain fourth channel information; the fourth channel information is channel information corresponding to the P antennas, where P is an integer greater than 0; and receive feedback information from the terminal device;

[0221] A processing unit 501 is configured to determine fifth channel information between the network device and the terminal device according to the fourth channel information and the feedback information;

[0222] The feedback information includes K spatial channel component identifiers and channel difference information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1;

[0223] The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the first channel information is the channel information between all antennas of the terminal device and all antennas of the network device, the MP root antennas are the antennas among the M root antennas except the P root antennas, and M is an integer greater than P.

[0224] In the above method, when the terminal device sends an uplink reference signal through part of the antenna, the network device can determine the complete channel information of the channel between the network device and the terminal device through the feedback difference information in the feedback information sent by the terminal device, thereby improving the performance of uplink and downlink data transmission.

[0225] In a possible implementation, the channel differential information corresponding to each of the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0226] In a possible implementation manner, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna includes one or more of the following:

[0227] an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0228] a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna;

[0229] A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna;

[0230] The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

[0231] In a possible implementation manner, when the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio;

[0232] When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna;

[0233] When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0234] In a possible implementation manner, the feedback information further includes one or more of the following:

[0235] The number of spatial channel components indicates the number of spatial channel components corresponding to the feedback information reported by the terminal device;

[0236] The time offset between the terminal device and the network device.

[0237] like Figure 6 The device 600 provided in the embodiment of the present application is shown. Figure 6 The device shown can be Figure 5 A hardware circuit implementation of the device shown in FIG. Figure 3 In the flowchart shown, the functions of the terminal device or network device in the above method embodiment are executed. Figure 6 Only the main components of the communication device are shown.

[0238] Figure 6 The device 600 shown includes at least one processor 620, which is used to implement the embodiment of the present application. Figure 3 Any of the methods.

[0239] The device 600 may also include at least one memory 630 for storing program instructions and / or data. The memory 630 is coupled to the processor 620. 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 620 may operate in coordination with the memory 630. The processor 620 may execute program instructions stored in the memory 630. At least one of the at least one memory may be included in the processor.

[0240] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be embodied as being executed by a hardware processor, or being executed by a combination of hardware and software modules in a processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0241] It should be noted that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processing circuit (digitalsignal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be embodied as a hardware decoding processor to perform, or a combination of hardware and software modules in the decoding processor to perform. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0242] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0243] The device 600 may also include a communication interface 610 for communicating with other devices via a transmission medium, so that the device used in the device 600 can communicate with other devices. In the embodiment of the present application, the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces. In the embodiment of the present application, when the communication interface is a transceiver, the transceiver may include an independent receiver, an independent transmitter; or a transceiver with integrated transceiver functions, or an interface circuit.

[0244] The device 600 may further include a communication line 640. The communication interface 610, the processor 620, and the memory 630 may be interconnected via the communication line 640; the communication line 640 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The communication line 640 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0245] For example, when the apparatus 600 implements Figure 3 The functions of the terminal equipment in the process shown are:

[0246] The processor 620 is configured to determine first channel information between the terminal device and the network device according to a downlink reference signal from the network device; and determine feedback information according to the first channel information;

[0247] The communication interface 610 is used to send the feedback information to the network device;

[0248] The feedback information includes K spatial channel component identifiers and channel differential information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; the K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the MP root antennas are antennas among the M root antennas except the P root antennas, M is an integer greater than P, and P is an integer greater than 0.

[0249] In the above method, the terminal device does not need to feed back complete channel information. It can feed back difference information and use a smaller measurement reporting overhead so that the network device can obtain complete channel information and improve the performance of uplink and downlink data transmission.

[0250] In a possible implementation, the channel differential information corresponding to each of the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0251] In a possible implementation, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, which represents a ratio or difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0252] The phase difference value represents the difference between the signal phase in the channel information corresponding to the first antenna and the signal phase in the channel information corresponding to the second antenna; the delay difference value represents the difference between the signal delay in the channel information corresponding to the first antenna and the signal delay in the channel information corresponding to the second antenna; the first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

[0253] In one possible implementation, when the channel differential information includes an amplitude ratio, the feedback information also includes amplitude flip indication information corresponding to the amplitude ratio; when the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; when the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0254] In a possible implementation, the feedback information further includes one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the network device.

[0255] For example, when the apparatus 600 implements Figure 3 The functions of the terminal equipment in the process shown are:

[0256] The communication interface 610 is used to measure the uplink reference signal from the P antennas of the terminal device to obtain fourth channel information; the fourth channel information is the channel information corresponding to the P antennas, and P is an integer greater than 0; and receive feedback information from the terminal device;

[0257] The processor 620 is configured to determine fifth channel information between the network device and the terminal device according to the fourth channel information and the feedback information;

[0258] The feedback information includes K spatial channel component identifiers and channel difference information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1;

[0259] The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the first channel information is the channel information between all antennas of the terminal device and all antennas of the network device, the MP root antennas are the antennas among the M root antennas except the P root antennas, and M is an integer greater than P.

[0260] In the above method, when the terminal device sends an uplink reference signal through part of the antenna, the network device can determine the complete channel information of the channel between the network device and the terminal device through the feedback difference information in the feedback information sent by the terminal device, thereby improving the performance of uplink and downlink data transmission.

[0261] In a possible implementation, the channel differential information corresponding to each of the K spatial channel component identifiers is the channel differential information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

[0262] In a possible implementation manner, the channel difference information between the channel information corresponding to the first antenna and the channel information corresponding to the second antenna includes one or more of the following:

[0263] an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna;

[0264] a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna;

[0265] A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna;

[0266] The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

[0267] In a possible implementation manner, when the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio;

[0268] When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna;

[0269] When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

[0270] In a possible implementation manner, the feedback information further includes one or more of the following:

[0271] The number of spatial channel components indicates the number of spatial channel components corresponding to the feedback information reported by the terminal device;

[0272] The time offset between the terminal device and the network device.

[0273] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) that contain computer-usable program code.

[0274] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0275] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0276] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for determining channel information, characterized in that: include: The terminal device determines first channel information between the terminal device and the network device according to a downlink reference signal from the network device; The terminal device determines feedback information according to the first channel information, and sends the feedback information to the network device; The feedback information includes K spatial channel component identifiers and channel difference information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the MP root antennas are the antennas among the M root antennas except the P root antennas, M is an integer greater than P, and P is an integer greater than 0.

2. The method according to claim 1, characterized in that The channel difference information corresponding to each of the K spatial channel component identifiers is the channel difference information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

3. The method according to claim 1, characterized in that Channel difference information between channel information corresponding to the first antenna and channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna; a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna; A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna; The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

4. The method according to claim 3, characterized in that: When the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio; When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

5. The method according to any one of claims 1 to 4, characterized in that: The feedback information may also include one or more of the following: The number of spatial channel components indicates the number of spatial channel components corresponding to the feedback information reported by the terminal device; The time offset between the terminal device and the network device.

6. A method for determining channel information, characterized in that: include: The network device measures the uplink reference signals from the P antennas of the terminal device to obtain the fourth channel information; The fourth channel information is the channel information corresponding to the P antennas, where P is an integer greater than 0; The network device receives feedback information from the terminal device; The network device determines fifth channel information between the network device and the terminal device according to the fourth channel information and the feedback information; The feedback information includes K spatial channel component identifiers and channel difference information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the first channel information is the channel information between all antennas of the terminal device and all antennas of the network device, the MP root antennas are the antennas among the M root antennas except the P root antennas, and M is an integer greater than P.

7. The method according to claim 6, characterized in that The channel difference information corresponding to each of the K spatial channel component identifiers is the channel difference information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

8. The method according to claim 6, characterized in that Channel difference information between channel information corresponding to the first antenna and channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna; a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna; A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna; The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

9. The method according to claim 8, characterized in that When the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio; When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

10. The method according to any one of claims 6 to 9, characterized in that: The feedback information may also include one or more of the following: The number of spatial channel components indicates the number of spatial channel components corresponding to the feedback information reported by the terminal device; The time offset between the terminal device and the network device.

11. A communication device, characterized in that: include: A processing unit, configured to determine first channel information between the communication device and the network device according to a downlink reference signal from the network device; and determine feedback information according to the first channel information; A communication unit, configured to send the feedback information to the network device; The feedback information includes K spatial channel component identifiers and channel difference information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the communication device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the MP root antennas are the antennas among the M root antennas except the P root antennas, M is an integer greater than P, and P is an integer greater than 0.

12. The device according to claim 11, characterized in that The channel difference information corresponding to each of the K spatial channel component identifiers is the channel difference information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

13. The device according to claim 11, characterized in that Channel difference information between channel information corresponding to the first antenna and channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna; a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna; A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna; The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

14. The device according to claim 13, characterized in that When the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio; When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

15. The device according to any one of claims 11 to 14, characterized in that: The feedback information may also include one or more of the following: The number of spatial channel components indicates the number of spatial channel components corresponding to the feedback information reported by the communication device; The time offset between the communication device and the network equipment.

16. A communication device, characterized in that: include: A communication unit, configured to measure uplink reference signals from P antennas of a terminal device to obtain fourth channel information; The fourth channel information is the channel information corresponding to the P antennas, where P is an integer greater than 0; receiving feedback information from the terminal device; a processing unit, configured to determine fifth channel information between the communication apparatus and the terminal device according to the fourth channel information and the feedback information; The feedback information includes K spatial channel component identifiers and channel difference information corresponding to each of the K spatial channel component identifiers; K is an integer greater than or equal to 1; The K channel differential information corresponding to the K spatial channel component identifiers is the difference information between the second channel information and the third channel information; the second channel information is the channel information corresponding to the P root antennas among the M root antennas of the terminal device in the first channel information; the third channel information is the channel information corresponding to the MP root antennas among the M root antennas in the first channel information; the first channel information is the channel information between all antennas of the terminal device and all antennas of the communication device, the MP root antennas are the antennas among the M root antennas except the P root antennas, and M is an integer greater than P.

17. The device according to claim 16, characterized in that The channel difference information corresponding to each of the K spatial channel component identifiers is the channel difference information between the channel information corresponding to at least one of the P antennas and the channel information corresponding to at least one of the MP antennas.

18. The device according to claim 16, characterized in that Channel difference information between channel information corresponding to the first antenna and channel information corresponding to the second antenna includes one or more of the following: an amplitude ratio or an amplitude difference, representing a ratio or a difference between a signal amplitude in the channel information corresponding to the first antenna and a signal amplitude in the channel information corresponding to the second antenna; a phase difference value, representing a difference between a signal phase in the channel information corresponding to the first antenna and a signal phase in the channel information corresponding to the second antenna; A delay difference, representing a difference between a signal delay in the channel information corresponding to the first antenna and a signal delay in the channel information corresponding to the second antenna; The first antenna is any one of the P antennas, and the second antenna is any one of the MP antennas.

19. The device according to claim 18, characterized in that When the channel difference information includes an amplitude ratio, the feedback information further includes amplitude flip indication information corresponding to the amplitude ratio; When the amplitude flip indication information is a first state value, it is used to indicate that the amplitude ratio is a ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna; When the amplitude flip indication information is a second state value, it is used to indicate that the amplitude ratio is the reciprocal of the ratio between the signal amplitude in the channel information corresponding to the first antenna and the signal amplitude in the channel information corresponding to the second antenna.

20. The device according to any one of claims 16 to 19, characterized in that The feedback information also includes one or more of the following: the number of spatial channel components, indicating the number of spatial channel components corresponding to the feedback information reported by the terminal device; and the time offset between the terminal device and the communication apparatus.

21. A communication device, characterized in that: include: processors, transceivers, and memory; The memory is used to store computer programs or instructions; The processor is used to execute the computer program or instructions stored in the memory. When executing the computer program or instructions, the communication device implements the method of any one of claims 1 to 5 or 6 to 10 through the transceiver.

22. A computer-readable storage medium, characterized in that: The method comprises a computer program or instructions, and when the computer program or instructions are executed, the method according to any one of claims 1 to 5 or 6 to 10 is performed.

23. A chip, characterized in that: The method comprises a processor coupled to a memory and configured to execute a computer program or instructions stored in the memory. When the processor executes the computer program or instructions, the method according to any one of claims 1 to 5 or 6 to 10 is executed.

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