WO2022001933A1

WO2022001933A1 - Channel state information feedback method and communication apparatus

Info

Publication number: WO2022001933A1
Application number: PCT/CN2021/102680
Authority: WO
Inventors: 尚鹏; 金黄平; 毕晓艳
Original assignee: 华为技术有限公司
Priority date: 2020-06-30
Filing date: 2021-06-28
Publication date: 2022-01-06
Also published as: CN113872649A; CN113872649B

Abstract

Disclosed in the present application are a channel state information (CSI) feedback method and a communication apparatus. The method comprises: a network device sends first indication information to a terminal; the terminal receives the first information, and feeds back CSI to the network device according to the first indication information, wherein the first indication information is used for indicating correspondences between antenna ports and channel state information reference signal (CSI-RS) ports. The present application may be applicable to a communication system comprising a hybrid antenna array. Because the network device can indicate the correspondences between the antenna ports and the CSI-RS ports for the terminal, the network device can be compatible with the determining rule of the current antenna port sequence, that is, compatible with various hybrid antenna arrays. In addition, the network device can indicate the same or different antenna port sequences for different hybrid antenna arrays, ensuring better system performance.

Description

A kind of channel state information feedback method and communication device

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application with the application number of 202010622808.9 and the application title of "A Feedback Method and Communication Device for Channel Status Information" filed with the China Patent Office on June 30, 2020, the entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the field of antenna technologies, and in particular, to a method and a communication device for feeding back channel state information.

Background technique

In order to improve the throughput of the system, multiple input and multiple output (multiple input and multiple output, MIMO) technology is introduced. However, as the dimension of the antenna array increases, the area of the antenna array also increases, which is not conducive to the deployment of the antenna array. To meet the area requirements of the antenna array, future designs of the antenna array may include more than one type of antenna element. For example, an antenna array designed in the future may include a two-port antenna unit and a four-port antenna unit. For example, the antenna elements included in the antenna array are not uniformly distributed in the horizontal direction and/or the vertical direction.

Although the MIMO technology can improve the throughput of the system, the throughput of the system also depends on the accuracy of the base station's acquisition of downlink channel state information (CSI). For example, for a frequency division duplexing (FDD) system, the terminal can feed back a precoding matrix based on a codebook that is linearly combined with multiple orthogonal beams, and the base station needs to feed back the precoding matrix or precoding through the terminal Matrix index (Precoding Matrix Index, PMI) method to obtain the downlink optimal precoding matrix.

The existing antenna array is a traditional dual-polarized antenna array, that is, an antenna array composed of cross-polarized antennas, and the codebook corresponding to the dual-polarized antenna array is, for example, the first codebook. For the dual-polarized antenna and the first codebook, the protocol specifies a rule for determining the correspondence between the antenna port and the channel state information reference signal (CSI-RS) port. The corresponding relationship between the unique antenna port and the CSI-RS port can be determined according to this rule. However, antenna arrays designed in the future may include more than one type of antenna elements. If this rule is followed, multiple correspondences between antenna ports and CSI-RS ports may be determined. The system performance corresponding to different correspondences is also different. If the terminal arbitrarily selects a correspondence between antenna ports and CSI-RS ports to feed back the precoding matrix, better system performance may not be guaranteed.

SUMMARY OF THE INVENTION

The present application provides a channel state information feedback method and communication device, which indicate the correspondence between antenna ports and CSI-RS ports for terminals, which can be compatible with various types of antenna arrays and improve system performance.

In a first aspect, an embodiment of the present application provides a method for feeding back channel state information. The method may be executed by a first communication device, and the first communication device may be a communication device or a communication device capable of supporting the functions required by the communication device to implement the method. , such as a chip or system-on-chip. The following description takes the communication device as a terminal as an example. The method includes:

The terminal receives first indication information from the network device, and sends CSI to the network device according to the first indication information, where the first indication information is used to indicate the correspondence between the antenna port and the CSI-RS port.

In a second aspect, an embodiment of the present application provides a method for feeding back channel state information. The method may be executed by a second communication device, and the second communication device may be a communication device or a communication device capable of supporting the functions required by the communication device to implement the method. , such as a chip or system-on-chip. The following description will be given by taking the communication device as a network device as an example. The method includes:

Send first indication information to the terminal, and receive CSI from the terminal; wherein, the first indication information is used to indicate the correspondence between the antenna port and the channel state information reference signal CSI-RS port, and the CSI is based on the first indication information. definite.

The embodiments of the present application may be applicable to a communication system including a hybrid antenna array (eg, antenna units including various numbers of ports). For a certain hybrid antenna array, if the current determination rule of the order of antenna ports is used, there may be various correspondences between antenna ports and CSI-RS ports. Therefore, in the embodiment of the present application, the network device may indicate the correspondence between the antenna ports and the CSI-RS ports for the terminal, which is compatible with the current determination rule of the order of the antenna ports. And it can be considered that the corresponding relationship between the antenna port and the CSI-RS port indicated by the network device corresponds to the hybrid antenna array set by the network device, so even if there are multiple hybrid antenna arrays, because the corresponding relationship between the antenna port and the CSI-RS port is different from the network device. It corresponds to the hybrid antenna array set by the equipment, so it can ensure better system performance. It can be seen that, with the method provided by the embodiments of the present application, in the case of multiple hybrid antenna arrays, the order of the antenna ports can be specified, so as to be compatible with various types of antenna arrays. At the same time, the network device can indicate the same or different antenna port sequences for different hybrid antenna arrays to ensure better system performance.

In a possible implementation manner of the first aspect and the second aspect, the antenna port corresponds to a radio frequency channel of an antenna array, and the antenna array satisfies one or more of the following conditions:

The antenna array includes at least one first antenna unit and at least one second antenna unit, and the number of ports of the first antenna unit and the second antenna unit are different;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one row of antenna elements arranged in a vertical direction, and the interval between two antenna elements in the at least one row of antenna elements is different or partially the same;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one row of antenna elements arranged in a vertical direction, and the spacing between two antenna elements in the at least one row of antenna elements is different or partially the same.

The embodiments of the present application can be applied to a variety of hybrid antenna arrays, such as an array composed of antenna elements with various port numbers, or an array composed of antenna elements distributed at unequal intervals in the horizontal direction or the vertical direction. wide.

The embodiments of this application are intended to indicate the correspondence between the antenna ports and the CSI-RS ports. In a possible implementation manner, the network device may directly indicate the correspondence between the antenna ports and the CSI-RS ports, or may indirectly indicate the correspondence between the antenna ports and the CSI-RS ports. The corresponding relationship of RS ports, for example, includes the following methods:

In an example, the first indication information includes first information and second information, where the first information is used to indicate the antenna port corresponding to the CSI-RS port in the first matrix, wherein the second The information is used to indicate the vertical and horizontal dimensions of the first matrix used to determine the antenna ports corresponding to the CSI-RS ports. In this solution, the first matrix can be considered as the mapping relationship between the virtual antenna ports of the antenna array and the CSI-RS ports, the vertical dimension and the horizontal dimension of the first matrix can be indicated by the second information, and the first matrix can be indicated by the first information. The antenna port corresponding to the CSI-RS port in . In this way, the terminal can determine which antenna ports in the first matrix are used for feeding back CSI based on the first information and the second information, which is easy to implement.

In some embodiments, the second information may be carried in a first field and a second field, the first field is used to carry the vertical dimension of the first matrix, and the second field is used to carry the first matrix the horizontal dimension. This solution has a more direct indication method, does not need to define the possible dimensions of the first matrix in advance, and has lower requirements on the system.

In some embodiments, the second information is carried in a third field, the third field occupies one or more bits, and different values of the third field indicate first matrices of different dimensions. This solution may indirectly indicate the vertical dimension and the horizontal dimension of the first matrix, for example, the possible dimensions of the first matrix are defined in advance, and different dimensions correspond to different values. The dimension of the first matrix can be determined by the value carried in the third field, and there is no need to separately indicate the vertical dimension and the horizontal dimension of the first matrix, which can save system overhead as much as possible.

In another example, the first indication information includes first information, where the first information is used to indicate the antenna port corresponding to the CSI-RS port in the first matrix, and the first matrix is used to determine the the antenna port corresponding to the CSI-RS port. In this solution, when the first matrix corresponding to the first information may have multiple dimensions, it can be agreed in advance that the dimension of the first matrix corresponding to the first information is one of these multiple dimensions, so that the network The device only needs to inform the terminal of the first information, but does not need to inform the terminal of the vertical dimension or the horizontal dimension of the first matrix, thereby saving signaling overhead.

In a possible implementation manner of the first aspect and the second aspect, the first indication information further includes third information, where the third information is used to indicate any two adjacent antennas included in the antenna array The spacing of elements in the horizontal direction, and the spacing of any two adjacent antenna elements in the vertical direction. Since the third information can be used to indicate the interval between any two adjacent antenna units in the horizontal direction, and the interval between any two adjacent antenna units in the vertical direction, even if the antenna units set by the base station are distributed at unequal intervals, Through this solution, the corresponding relationship between the antenna port and the CSI-RS can also be determined. It can be seen that this solution is not only compatible with antenna units including a variety of port numbers, but also compatible with antenna units distributed at unequal intervals, and has a wider application range.

In a possible implementation manner of the second aspect, the antenna unit includes a four-port antenna unit, and the method further includes:

The four-port antenna unit is equivalent to two two-port antennas, and the first indication information is determined according to the two-port antenna obtained after the equivalence, wherein,

The first antenna element and the second antenna element of the four-port antenna unit are equivalent to a two-port antenna element, and the third antenna element and the fourth antenna element of the four-port antenna unit are equivalent to another two-port antenna element. The antenna element and the third antenna element are the two antenna elements of the four-port antenna unit in the first polarization direction, and the second antenna element and the fourth antenna element are the two antennas of the four-port antenna unit in the second polarization direction vibrator.

In the embodiment of the present application, the four-port antenna unit can be equivalent to two two-port antenna units, that is, other types of antenna units are equivalent to the traditional dual-polarized antenna array, which is compatible with the traditional dual-polarized antenna. Array-matched codebook, no need to redesign the codebook.

There are various ways in which the four-port antenna unit is equivalent to two two-port antenna units in the embodiments of the present application, including but not limited to the following equivalent ways:

Equivalent mode 1, the positions of the four antenna elements of the four-port antenna unit are changed, and the two two-port antenna units are located in the same row;

Equivalent mode 2, the positions of the four antenna elements of the four-port antenna unit are changed, and the two two-port antenna units are located in the same column;

In the third equivalent mode, the positions of the four antenna elements of the four-port antenna unit are changed, and the two two-port antenna units are distributed along the diagonal.

In the fourth equivalent manner, the positions of the four antenna elements of the four-port antenna unit remain unchanged, wherein the positions of the two antenna elements of any one of the two two-port antenna units are different. That is, the positions of the four antenna elements of the four-port antenna unit after being equivalent are all different.

In a third aspect, an embodiment of the present application provides a communication device, which may be a terminal-side communication device or a communication device capable of supporting the functions required by the communication device to implement the method, such as a chip or a chip system. The communication apparatus may include a processing module and a transceiver module, wherein the transceiver module is configured to receive first indication information from a network device, and send the CSI determined by the processing module according to the first indication information to the network device, wherein, The first indication information is used to indicate the correspondence between the antenna port and the CSI-RS port.

In a possible implementation manner, the antenna port corresponds to a radio frequency channel of an antenna array, wherein the antenna array satisfies one or more of the following conditions:

In a possible implementation manner, the first indication information includes first information, where the first information is used to indicate an antenna port corresponding to the CSI-RS port in the first matrix, wherein the first A matrix is used to determine the antenna ports corresponding to the CSI-RS ports.

In a possible implementation manner, the first indication information further includes second information, where the second information is used to indicate the vertical dimension and the horizontal dimension of the first matrix.

In a possible implementation manner, the first indication information further includes third information, where the third information is used to indicate the interval in the horizontal direction between any two adjacent antenna elements included in the antenna array, and the interval between any two adjacent antenna elements in the vertical direction.

In a fourth aspect, an embodiment of the present application provides a communication device, which may be a network-side communication device or a communication device capable of supporting functions required by the communication device to implement the method, such as a chip or a chip system. The communication device may include a processing module and a transceiver module, wherein the transceiver module is configured to send first indication information generated by the processing module to a terminal and receive CSI from the terminal, wherein the first indication The information is used to indicate the correspondence between the antenna port and the CSI-RS port, and the CSI is determined according to the first indication information.

In a possible implementation manner, the processing module is further configured to equate the four-port antenna unit into two two-port antennas, and determine the first indication information according to the two-port antennas obtained after the equivalence, wherein,

Regarding the technical effects brought by the third aspect or the fourth aspect or various possible implementations of the third aspect or various possible implementations of the fourth aspect, please refer to the first aspect or the second aspect or the first aspect. Introduction of various possible implementations of the aspect or technical effects of various possible implementations of the second aspect.

In a fifth aspect, an embodiment of the present application further provides a CSI feedback method, the method can be executed by a second communication device, and the second communication device can be a communication device or a communication device capable of supporting the functions required by the communication device to implement the method, For example a chip or a system of chips. The following description will be given by taking the communication device as a network device as an example. The method includes:

Equivalent each four-port antenna included in the antenna array to two two-port antennas to obtain an equivalent antenna array;

perform CSI-RS port mapping according to the equivalent antenna array;

Send first indication information to the terminal, where the first indication information is used to indicate the correspondence between the antenna ports included in the antenna array and the CSI-RS ports.

In a possible implementation manner, the antenna array satisfies one or more of the following conditions:

In a possible implementation, equalizing each four-port antenna included in the antenna array as two two-port antennas includes:

The first antenna element and the second antenna element of the four-port antenna unit are equivalent to a two-port antenna element, and the third antenna element and the fourth antenna element of the four-port antenna unit are equivalent to another two-port antenna element. The first antenna element and the third antenna element are the two antenna elements of the four-port antenna element in the first polarization direction, and the second antenna element and the fourth antenna element are the two antenna elements of the four-port antenna element in the second polarization direction Antenna vibrator.

In a possible implementation manner, the first indication information includes first information and second information, and the first information is used to indicate the antenna port corresponding to the CSI-RS port in the first matrix, wherein, The second information is used to indicate the vertical dimension and the horizontal dimension of the first matrix, and the first matrix is used to determine the antenna port corresponding to the CSI-RS port.

In a sixth aspect, an embodiment of the present application provides a communication device, which may be a network-side communication device or a communication device capable of supporting the functions required by the communication device to implement the method, such as a chip or a chip system. The communication device may include a processing module and a transceiver module, wherein the processing module is configured to equivalently convert each four-port antenna included in the antenna array into two two-port antennas, obtain an equivalent antenna array, and obtain the equivalent antenna array according to the The equivalent antenna array performs CSI-RS port mapping; the transceiver module is configured to send first indication information to the terminal, where the first indication information is used to indicate the antenna ports included in the antenna array and the CSI-RS Port correspondence.

In a possible implementation manner, the processing module is specifically used for:

In a seventh aspect, an embodiment of the present application provides a communication device, and the communication device may be the communication device in the third aspect or the fourth aspect or the sixth aspect in the above-mentioned embodiments, or the communication device in the third aspect or the fourth aspect or the chip or chip system in the communication device of the sixth aspect. The communication device includes a communication interface, a processor, and optionally, a memory. Wherein, the memory is used to store computer programs or instructions or data, and the processor is coupled with the memory and the communication interface, and when the processor reads the computer program or instructions or data, the communication device is made to execute the above-mentioned method embodiments by the terminal or the communication interface. The method performed by the network device.

It should be understood that the communication interface may be a transceiver in a communication device, for example, implemented by an antenna, a feeder, a codec, etc. in the communication device, or, if the communication device is a chip provided in a network device, the communication interface It can be an input/output interface of the chip, such as input/output circuits, pins, etc., for inputting/outputting instructions, data or signals. The transceiver is used for the communication device to communicate with other devices. Exemplarily, when the communication device is a terminal, the other device is a network device; or, when the communication device is a network device, the other device is a terminal.

In an eighth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor, and may further include a memory, for implementing the method executed by the communication apparatus of the third aspect or the fourth aspect or the sixth aspect. In a possible implementation manner, the chip system further includes a memory for storing program instructions and/or data. The chip system can be composed of chips, and can also include chips and other discrete devices.

In a ninth aspect, an embodiment of the present application provides a communication system, where the communication system includes the communication device described in the third aspect and the communication device described in the fourth aspect, or the communication system includes the communication device described in the third aspect A communication device and the communication device of the sixth aspect.

In a tenth aspect, the present application provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed, the method executed by the terminal in the above aspects is implemented; A method of an aspect performed by a network device.

In an eleventh aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is executed, the method performed by the terminal in the above aspects is executed, or the above-mentioned method is executed. A method performed by a network device of various aspects is performed.

For the beneficial effects of the fifth to eleventh aspects and implementations thereof, reference may be made to the description of each aspect or the beneficial effects of various aspects and implementations thereof.

Description of drawings

FIG. 1 is a schematic diagram of the architecture of a suitable communication system provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a dual-polarized antenna unit provided by an embodiment of the present application;

3 is a schematic diagram of a corresponding relationship between a vibrator and a radio frequency channel in a dual-polarized antenna unit provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a hybrid antenna array provided by an embodiment of the present application;

5 is a schematic flowchart of a terminal feeding back CSI to a base station;

6 is a schematic diagram of a correspondence between a dual-polarized antenna unit and a CSI-RS port provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of possible correspondences existing between antenna elements included in a hybrid antenna array and CSI-RS ports provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of possible correspondences existing between antenna elements included in a hybrid antenna array and CSI-RS ports provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of the principle that QHA/QSA is equivalent to XPO in the same polarization direction provided by an embodiment of the present application;

FIG. 10 is a schematic diagram illustrating that a hybrid antenna array provided by an embodiment of the application is equivalent to a conventional dual-polarized antenna;

11 is a schematic diagram of a four-port antenna unit provided by an embodiment of the present application being equivalent to a conventional dual-polarized antenna;

FIG. 12 is a schematic diagram of a hybrid antenna array provided by an embodiment of the present application being equivalent to a dual-polarized antenna array;

13 is a schematic flowchart of a method for feeding back channel state information provided by an embodiment of the present application;

FIG. 14 is a schematic diagram of a hybrid antenna array provided by an embodiment of the present application being equivalent to a virtual dual-polarized antenna array;

FIG. 15 is a schematic diagram of a hybrid antenna array provided by an embodiment of the present application being equivalent to a virtual dual-polarized antenna array;

16 is a schematic diagram of possible correspondences between antenna elements included in a hybrid antenna array and CSI-RS ports provided by an embodiment of the present application;

17 is a schematic diagram of unevenly spaced antenna elements in the horizontal direction;

FIG. 18 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 19 is another schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 20 is a schematic structural diagram of a communication device according to an embodiment of the present application;

FIG. 21 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 22 is another schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 23 is a schematic structural diagram of another communication apparatus provided by an embodiment of the present application.

detailed description

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The technical solutions provided by the embodiments of the present application can be applied to long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD), universal mobile Communication system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (WiMAX) communication system, and new wireless (new radio, NR) communication system, etc. Of course, the technical solutions provided in the embodiments of the present application may also be applied to a machine-to-machine (M2M) network, an internet of things (Internet of things, IoT) network, or other networks. It can also be applied to links between devices, such as device-to-device (D2D) links. A D2D link can also be called a sidelink, and a sidelink can also be called a side link or a secondary link. In the embodiments of the present application, the above terms all refer to links established between devices of the same type, and have the same meaning. The so-called equipment of the same type may be a link between terminals and terminals, a link between a base station and a base station, or a link between a relay node and a relay node, etc. This embodiment of the present application This is not limited.

Please refer to FIG. 1 , which is an application scenario applied by the embodiment of the present application, or a network architecture applied by the embodiment of the present application. FIG. 1 includes network devices and 6 terminals. It should be understood that the number of terminals in FIG. 1 is only an example, and may be more or less. The network architecture may also include other network devices, such as wireless The relay device and the wireless backhaul device are not shown in FIG. 1 . The network device is an access device through which the terminal accesses the network wirelessly, and may be a base station. Wherein, the network equipment corresponds to different equipment in different systems, for example, in the fourth-generation mobile communication technology (4th-generation, 4G) system, it can correspond to an evolved base station (evolutional Node B, eNB or e-NodeB) in LTE, In the 5G NR system, it corresponds to the next generation node B (gNB); these six terminals can be cellular phones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, A personal digital assistant (PDA) and/or any other suitable device for communicating over a wireless communication system can be connected to the network device.

The embodiments of the present application may be applicable to uplink signal transmission, may also be applicable to downlink signal transmission, and may also be applicable to D2D signal transmission. For downlink signal transmission, the sending device is a network device, and the corresponding receiving device is a terminal; for uplink signal transmission, the sending device is a terminal, and the corresponding receiving device is a network device; for D2D signal transmission, the sending device is a terminal, and the receiving device is also terminal. For example, the three terminals shown in the dotted line area in FIG. 1 may be suitable for D2D signal transmission, and the embodiment of the present application does not limit the direction of signal transmission.

A terminal, also called a terminal device, can be a wireless terminal device that can receive scheduling and instructions from network devices. A wireless terminal device can be a device that provides voice and/or data connectivity to a user, or a handheld device with wireless connectivity, or Other processing equipment connected to the wireless modem. A wireless end device may communicate with one or more core networks or the Internet via a radio access network (eg, radio access network, RAN), and the wireless end device may be a mobile end device, such as a mobile phone (or "cellular" phone) , mobile phone (mobile phone), computer and data card, for example, may be portable, pocket, hand-held, computer built-in or vehicle mounted mobile devices that exchange language and/or data with the radio access network. For example, personal communication service (PCS) telephones, cordless telephones, Session Initiation Protocol (SIP) telephones, wireless local loop (WLL) stations, PDAs, tablet computers (Pads), wireless transceivers computer and other equipment. Wireless terminal equipment may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point ( access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), subscriber station (SS), user terminal equipment (customer premises equipment, CPE), terminal (terminal), user equipment (user equipment, UE), mobile terminal (mobile terminal, MT), etc. The wireless terminal device can also be a wearable device and a next-generation communication system, for example, a terminal in a 5G network or a terminal in a future evolved public land mobile network (PLMN) network, a terminal in an NR communication system, etc. .

A network device is an entity on the network side that transmits or receives signals, such as a new generation base station (generation Node B, gNodeB). A network device may be a device used to communicate with mobile devices. The network device may be an AP in wireless local area networks (WLAN), an evolved base station (evolutional Node B, eNB or eNodeB) in long term evolution (LTE), or a relay station or access point, or In-vehicle equipment, wearable equipment and network equipment in future 5G networks or network equipment in future evolved public land mobile network (PLMN) networks, or gNodeB/gNB in NR systems, etc. In the following, the network device is a gNB as an example.

The gNB may include an antenna, a base band unit (BBU) and a remote radio unit (RRU). The BBU may be connected to the RRU through a common public radio interface (CPRI) or enhanced CPRI (enhance CPRI, eCPRI), and the RRU may be connected to the antenna through a feeder. The antenna can be a passive antenna, which is separated from the RRU and can be connected through a cable. Or the antenna may be an active antenna unit (active antenna unit, AAU), that is, the antenna unit of the AAU and the RRU are integrated into one piece. AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas.

In some deployments, a gNB may include a centralized unit (CU) and a distributed unit (DU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the DU can be used to transmit and receive radio frequency signals, convert radio frequency signals to baseband signals, and perform part of baseband processing. The CU can be used to perform baseband processing, control the base station, and so on. In some embodiments, the CU is responsible for processing non-real-time protocols and services, and implementing functions of radio resource control (radio resource control, RRC), packet data convergence protocol (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, medium access control (MAC) layer, and physical (PHY) layer. Since the information of the RRC layer will eventually become the information of the PHY layer, or be transformed from the information of the PHY layer, therefore, in this architecture, the higher-layer signaling, such as the RRC layer signaling, can also be considered to be sent by the DU. , or, sent by DU and AAU. It can be understood 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 can be divided into network devices in an access network (radio access network, RAN), and the CU can also be divided into network devices in a core network (core network, CN), which is not limited in this application.

The DU can deploy an antenna array, the antenna array can include one or more antenna units, each antenna unit can include one or more vibrators, and each vibrator can correspond to a radio frequency chain (RF chain), or multiple The vibrator can correspond to one RF channel. If the plurality of antenna elements can form an antenna system in the form of an array, the antenna system can be called an antenna array, or an antenna array.

For example, please refer to FIG. 2 , which is a schematic diagram of a dual-polarized antenna array. A dual-polarized antenna array means that the antenna elements are evenly distributed in the vertical and horizontal directions. The antenna array shown in FIG. 2 is an 8×8 antenna array, that is, the antenna array includes 8 rows and 8 columns of antenna elements. Each antenna unit is a cross-polarized antenna unit (also referred to as a dual-polarized antenna unit for short), which is indicated by "x". Each cross-polarized antenna element corresponds to two polarization directions, as shown in Figure 2, "╲" represents the first polarization direction, and "/" represents the second polarization direction. For example, the first polarization direction may be the horizontal polarization direction, and the second polarization direction may be the vertical polarization direction; or, the first polarization direction may be the vertical polarization direction, and the second polarization direction may be the horizontal polarization direction ; Or, the first polarization direction may be the +45° polarization direction, and the second polarization direction may be the -45° polarization direction; or, the first polarization direction may be the -45° polarization direction, and the second polarization direction may be The polarization direction may be the +45° polarization direction.

Alternatively, each antenna element may comprise a cross-polarized antenna. In this case, each antenna unit includes two dipoles with different polarization directions, such as one dipole in the first polarization direction and one dipole in the second polarization direction. Each oscillator can be driven by an independent RF channel. One radio frequency channel corresponds to one antenna port, that is, each vibrator may correspond to one antenna port, that is, each antenna unit may correspond to two antenna ports, and the antenna unit may be referred to as a two-port antenna unit.

Optionally, each antenna element includes a plurality of cross-polarized antennas. In this case, each antenna unit may include two groups of elements with different polarization directions, such as a group of elements with a first polarization direction and a group of elements with a second polarization direction. Each group of vibrators may include a plurality of vibrators, and the plurality of vibrators may be driven by an independent radio frequency channel. That is, each group of vibrators may correspond to one antenna port, that is, each antenna unit may also correspond to two antenna ports, and the antenna unit is still a two-port antenna unit.

In a possible design, a group of oscillators driven by the same independent RF channel is called a subarray. That is to say, each sub-array may correspond to one radio frequency channel, that is, one antenna port. It should be understood that each antenna unit may be composed of multiple sub-arrays. For example, a two-port antenna unit consists of two sub-arrays. Hereinafter, for the convenience of distinction and description, a group of vibrators corresponding to one radio frequency channel is referred to as a sub-array.

For ease of understanding, FIG. 3 shows an example of a cross-polarized antenna element. FIG. 3 specifically shows the correspondence between the antenna elements in the cross-polarized antenna unit and the radio frequency channel (antenna port). As shown in the figure, a) in FIG. 3 shows an antenna unit composed of two dipoles with different polarization directions. The vibrator in the first polarization direction is driven by the radio frequency channel 1 , and the vibrator in the second polarization direction is driven by the radio frequency channel 2 . b) in FIG. 3 shows an antenna unit composed of two groups of dipoles with different polarization directions. The four oscillators in the first polarization direction are all driven by the radio frequency channel 1 , and the four oscillators in the second polarization direction are all driven by the radio frequency channel 2 . It should be noted that b) in FIG. 3 only takes an example that one antenna unit includes four vibrators in the same polarization direction, that is, one radio frequency channel drives four vibrators. This embodiment of the present application does not limit the number of oscillators driven by the radio frequency channel. For example, each RF channel can drive one oscillator, two oscillators, three oscillators, or any other number of oscillators.

In order to obtain a larger system throughput, when designing an antenna, it is necessary to maximize the polarization degree of freedom of the antenna array and maximize the spatial resolution of the antenna array. For this reason, in a possible design, the distance between two adjacent antenna units is set to be the half wavelength of the working frequency. The antenna array under this design has excellent spatial resolution and strong sidelobe suppression.

Take the dual-polarized antenna array shown in Figure 2 as an example. The distance between two adjacent antenna units is 0.5 wavelengths. In the 8×8 antenna array shown in FIG. 2 , the total distance between the antenna units is about 3.5 (0.5×7) wavelengths. Considering the area of the antenna array itself, the width of the antenna array shown in FIG. 2 can be designed to be about 4 wavelengths. However, when the base station deploys the antenna, due to the influence of factors such as wind resistance, the area of the antenna array is limited, especially the width of the antenna array. For the antenna array shown in FIG. 2, in the frequency band with the center frequency point of 1.8 gigahertz (GHz), the corresponding width of the antenna array is about 667 millimeters (mm).

However, with the introduction of MIMO technology, the number of antenna elements increases, the dimension of the antenna array increases, and the area of the antenna array also increases, which is not conducive to the deployment of the antenna array. In order to facilitate the deployment of the antenna array, generally speaking, the area of the antenna array is limited. For example, for products that support frequency bands below 3G (referred to as Sub3G products), the typical size of the antenna array is limited to 500cm horizontally and 1000cm vertically.

On the premise of meeting the area requirement, in a possible design, the horizontal and/or vertical spacing between multiple antenna elements of an antenna array designed in the future may not be uniform, or the multiple antenna elements may be irregularly distributed. In another possible design, greater system throughput can be obtained by increasing the number of antenna ports. If the throughput of the system can be improved by increasing the number of antenna ports, the antenna arrays designed in the future may include multiple antenna elements with different numbers of antenna ports. For the convenience of description, the antenna arrays designed in the future are hereinafter referred to as hybrid antenna arrays. It should be understood that the types of antenna elements included in the hybrid antenna array are different. It should be noted that, in this embodiment of the present application, the types of antenna units may be divided according to the number of antenna ports, or may be divided according to the interval between antenna units.

Exemplarily, a certain antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction. If the spacing between two antenna elements in at least one row is different or partially the same, then the antenna array is a hybrid antenna array. If the spacing between two antenna elements in at least one column of antenna elements is different or partially the same, then the antenna array is a hybrid antenna array. In other words, the antenna array can be divided into at least two types according to whether the spacing of the antenna elements is uniform or non-uniform. For example, if the antenna elements included in the antenna array are evenly spaced, the antenna array is the first type of antenna array; if the antenna elements included in the antenna array are unevenly spaced, the antenna array is the second type of antenna array. Or, if the antenna elements included in the antenna array are arranged according to certain rules, then the antenna array is the first type of antenna array; relatively speaking, if the antenna elements included in an antenna array are not arranged according to certain rules, then the antenna array is the first type of antenna array. The array is a second type of antenna array. Exemplarily, the interval between the antenna elements included in an antenna array is not uniform, but the antenna elements included in the antenna array are symmetrically distributed about a certain line, then the antenna array is the first type of antenna array; The interval between the antenna elements included in each antenna array is not uniform, and the distribution of the antenna elements is irregular, then the antenna array is the second type of antenna array. It should be understood that a hybrid antenna array may include irregularly distributed antenna elements.

It should be noted that, in this embodiment of the present application, the interval between two antenna units includes a horizontal interval and/or a vertical interval. The horizontal interval may be the horizontal interval between two antenna elements in the same polarization direction in each pair of antenna units. The horizontal interval may also be the horizontal equivalent distance of the radio frequency channel, that is, the horizontal equivalent interval between the two groups of antenna elements in the same polarization direction in the two antenna units. Similarly, the vertical interval may be the vertical interval between two antenna elements in the same polarization direction in the two antenna units. The vertical interval may also be the vertical equivalent distance of the radio frequency channel, that is, the vertical equivalent interval between the two groups of antenna elements in the same polarization direction in the two antenna units.

The horizontal interval between the plurality of antenna elements in the antenna array may be the horizontal interval between two adjacent antenna elements. Alternatively, the horizontal interval between the multiple antenna elements in the antenna array may also be the horizontal equivalent distance of the radio frequency channel, that is, the horizontal interval between adjacent two groups of antenna elements. Similarly, the vertical interval between multiple antenna elements in the antenna array may be the vertical interval between two adjacent antenna elements. Alternatively, the vertical interval between the multiple antenna elements in the antenna array may also be the vertical equivalent distance of the radio frequency channel, that is, the vertical interval between the adjacent two groups of antenna elements.

Exemplarily, an antenna array includes at least one first antenna unit and at least one second antenna unit. If the number of ports of the first antenna unit and the second antenna unit are different, the antenna array is a hybrid antenna array. For example, the first antenna unit is a two-port antenna unit, and the second antenna unit is a four-port antenna unit. For another example, the first antenna unit is a four-port antenna unit, and the second antenna unit is an eight-port antenna unit.

It should be understood that, assuming that a certain hybrid antenna array includes at least one row of antenna elements arranged in the horizontal direction and at least one column of antenna elements arranged in the vertical direction, the antenna elements in the hybrid antenna array include at least one first antenna element and at least one antenna element. The second antenna element, then the hybrid antenna array can satisfy one or more of the following conditions:

Condition 1, the hybrid antenna array includes at least two antenna elements with different port numbers;

Condition 2, the interval between two antenna elements in at least one row of antenna elements included in the hybrid antenna array is different or partially the same;

Condition 3, the interval between two antenna elements in at least one column of antenna elements included in the hybrid antenna array is different or partially the same;

Condition 4, the multiple antenna elements included in the hybrid antenna array are arranged irregularly.

For easy understanding, please refer to FIG. 4 , which is a schematic structural diagram of a hybrid antenna array. For ease of understanding and description, each antenna element is represented by a graph, such as "x" or "●", and different graphs represent different antenna elements. For example, "×" indicates a two-port antenna element, and "•" indicates a four-port antenna element. Exemplarily, the four-port antenna unit may include a quadrifilar helix antenna (QHA), a quadrifilar square antenna (QSA). QHA includes 4 antenna elements, each antenna element is a helical antenna, and one antenna element corresponds to one antenna port. The QSA includes 4 antenna elements, each antenna element is a square antenna, and one antenna element corresponds to one antenna port. It should be noted that "×" and "●" do not limit the number of antenna elements and the number of ports included in each antenna unit.

The hybrid antenna array shown in FIG. 4 is an antenna array with 16 rows and 12 columns, and the hybrid antenna array includes two types of antenna arrays. For example, the hybrid antenna array may include cross polarization antenna (XPO) and QHA, or include XPO and QSA, and so on. It should be understood that FIG. 4 only takes the hybrid antenna array including two types of antenna elements as an example, and the embodiments of the present application do not limit the types of antenna elements included in the hybrid antenna array. For example, a hybrid antenna array may include at least three types of antenna elements.

It should be noted that, the antenna unit in the hybrid antenna array shown in FIG. 4 may be a vibrator driven by a radio frequency channel alone, or may be a sub-array driven by a radio frequency channel. For the corresponding relationship between the vibrator and the radio frequency channel, reference may be made to the relevant description of the cross-polarized antenna unit above in conjunction with a) and b) of FIG. 3 . If each vibrator in the two-port antenna unit is driven by an independent radio frequency channel, the corresponding relationship between each vibrator in the antenna unit and the radio frequency channel can refer to a) in Figure 3. If multiple vibrators in the two-port antenna unit Driven by a radio frequency channel, the corresponding relationship between each vibrator in the antenna unit and the radio frequency channel can refer to b) in FIG. 3 .

FIG. 5 shows an example of a four-port antenna unit. FIG. 5 specifically shows the correspondence between the dipoles and the radio frequency channels in the four-port antenna unit. If each element in the four-port antenna unit is driven by an independent RF channel, please refer to a) in Figure 5. It can be seen that the four-port antenna unit may include four elements, each driven by an independent radio frequency channel. Each vibrator can provide one port. If multiple elements in the four-port antenna unit are driven by one radio frequency channel, the corresponding relationship between each element in the antenna unit and the radio frequency channel may refer to b) in FIG. 5 . It can be seen that the four-port antenna unit may include four sub-arrays, each sub-array may include four dipoles, and each sub-array may be driven by one radio frequency channel. Each subarray can provide one port.

It should be understood that what is shown in FIG. 5 is only an example, and should not constitute any limitation to the present application. Each radio frequency channel may also correspond to two, three or other numbers of oscillators. This application does not limit this.

Although the introduction of MIMO technology can improve the throughput of the system. However, this also depends on the accuracy of the base station's acquisition of downlink channel state information (channel state information, CSI). The CSI can be considered as information that is reported by a receiving end (such as a terminal) to a transmitting end (such as a network device) and is used to describe the channel attributes of the communication link. CSI may include a precoding matrix indicator (PMI), a rank indicator (RI), a CSI-RS resource indicator (CRI), and a layer indicator (LI), among others. at least one. It should be understood that the specific contents of the CSI enumerated above are only exemplary descriptions, and should not constitute any limitation to the embodiments of the present application. The CSI may include one or more of the contents listed above, and may also include other information used to characterize the CSI in addition to the above listed, which is not limited in this embodiment of the present application.

For some systems, such as a time division duplex (TDD) system, since the uplink channel and the downlink channel have strict reciprocity, the base station can use the uplink channel state information to obtain the downlink channel state information. However, for some systems, such as frequency division duplexing (FDD) systems, the uplink and downlink use different frequency bands, and the uplink and downlink channels (ie, the uplink channel and the downlink channel) do not have complete reciprocity, and the uplink channel cannot be used. The state information is used to obtain the downlink channel state information, and the downlink precoding matrix cannot be obtained, that is, the precoding of the data transmitted by the terminal. In some embodiments, the base station may obtain the optimal downlink precoding matrix by means of the terminal feeding back the precoding matrix or PMI.

As shown in FIG. 6 , the basic flow chart of CSI measurement for the base station and the terminal is shown. The base station first sends a signaling for the configuration of channel measurement to the terminal, informing the terminal to perform channel measurement, wherein the signaling indicates the time when the terminal is to perform channel measurement, and then the base station sends a pilot to the terminal (the concept of pilot includes a reference signal) It is used for channel measurement; the terminal measures according to the pilot frequency sent by the base station, and calculates to obtain the final CSI; the base station then sends data according to the CSI fed back by the terminal. For example, the base station determines the number of streams to transmit data to the terminal according to the RI included in the CSI fed back by the terminal; The PMI included in the CSI determines the precoding of data transmitted to the terminal.

The terminal can feed back the precoding matrix based on the codebook and the selected antenna port. The codebook has significant performance advantages by linearly combining multiple orthogonal beams. In some embodiments, a codebook for conventional dual polarized antenna arrays is proposed. Exemplarily, the codebook types defined in NR Release15 include Type I codebook and Type II codebook. It should be understood that the basis used by the Type I codebook and the Type II codebook comes from a discrete Fourier transform (discrete fourier transform, DFT) basis. The Type I codebook can characterize the channel direction based on one DFT beam, and the Type II codebook can characterize the channel direction based on weighted superposition of multiple DFT beams. It should be noted that the horizontal spacing of the antenna elements included in the conventional dual-polarized antenna array is about 0.5 wavelength, the vertical spacing of the antenna elements is about 0.8 wavelength, and the antenna elements are uniformly distributed in the vertical and horizontal directions.

An antenna port can be understood as a transmit antenna identified by the receiving device, or a transmit antenna that can be distinguished in space. It should be understood that the transmit antenna here can be a part of or all of the at least one antenna set by the transmitting device. The weighted combination of multiple transmit antennas may be regarded as a virtual antenna (one radio frequency channel), and one antenna port may be pre-configured for each virtual antenna, that is, one radio frequency channel corresponds to one antenna port. Each antenna port may correspond to one reference signal, for example, the reference signal is a channel state information reference signal (CSI-RS) or the reference signal is a sounding reference signal (sounding reference signal, SRS). It should be noted that, in this embodiment of the present application, the manner of indicating the correspondence between the antenna ports and the CSI-RS ports is also applicable to indicating the correspondence between the antenna ports and the SRS ports.

It should be understood that indicating the corresponding relationship between the antenna port and the CSI-RS port may include the order of indicating the antenna port, which is equivalent to indicating the corresponding CSI-RS port, or indicating the order in which the antenna port performs CSI-RS port mapping, That is, it is equivalent to perform CSI-RS port mapping in the order of the indicated antenna ports.

In some embodiments, the correspondence between the antenna ports of the base station and the CSI-RS ports is specified. The corresponding relationship may also be referred to as the corresponding relationship between the antenna radio frequency channel of the base station and the CSI-RS port. Exemplarily, the antenna ports are numbered in the order of column first and then row repolarization. Please refer to FIG. 7 , which is a schematic diagram of the correspondence between antenna ports and CSI-RS ports of a conventional dual-polarized antenna array. In FIG. 7 , the antenna ports and CSI-RS ports are arranged in the first row (direction indicated by ① in FIG. 7 ), the rear row (direction indicated by ② in FIG. 7 ), and then polarized (direction indicated by ③ in FIG. 7 ). They are numbered sequentially, and are numbered according to the first polarization direction and then the second polarization direction. Numbering starts from 1, and the port order is shown in Figure 7, from number 1 to number 16.

It should be understood that the row and column here can be understood as a row or column that looks like a straight line and is formed by a plurality of antenna elements arranged in a straight line. Hereinafter, terms such as "left," "right," "upper," "lower," and the like are introduced to describe orientation for the sake of description. When describing a column, the positional relationship can be defined by "left" and "right", and when describing a row, the positional relationship can be defined by "up" and "down". In the description below, for the convenience of distinction, different rows or columns may be described by terms such as first column, second column, first row, and second row. Unless otherwise specified, the sequence number of the column can be determined in the direction from left to right, and the sequence number of the row can be determined in accordance with the sequence number from the top to the bottom. For example, the first column may refer to the leftmost column and the first row may refer to the topmost row.

It should be understood that these terms are only introduced for the convenience of understanding when describing in conjunction with the accompanying drawings, and should not constitute any limitation to the present application. "Left", "Right", "Up", and "Down" are all relative to the azimuth-determined antenna array. It can be understood that, in actual use, the antenna array can be deployed on the antenna panel, and the antenna panel can be mounted on the bracket. During the installation process, the antenna panel may be tilted, flipped or rotated, and the orientation of the antenna array may change, but this will not affect the relative positional relationship between the antenna elements in the antenna array. Among them, "left" is opposite to "right" and corresponds to a column; "up" is opposite to "bottom" and corresponds to a row. For example, if the antenna array is rotated 90° around the center axis, "left" and "right" can be exchanged for "up" and "down", "column" can be exchanged for "row"; "up" and "down" can be exchanged are swapped for "left" and "right", and "row" can be swapped for "column". For another example, when the antenna array is rotated 180° around the center axis, "left" and "right" can be reversed, and "up" and "down" can be reversed.

As shown in FIG. 7 , for a conventional dual-polarized antenna array, the port sequence can be specified for the antenna port numbers in the order of column first, then row and then re-polarization. And for the traditional dual-polarized antenna array, there is a Type I codebook or a Type II codebook (for convenience of description, hereinafter collectively referred to as the first codebook). It should be understood that the design of the first codebook can guarantee system performance. Therefore, the terminal feeds back the precoding matrix to the base station according to the port sequence and the first codebook, which can ensure system performance.

However, the future antenna array may be a hybrid antenna array, such as the hybrid antenna array shown in Figure 4, or an antenna array composed of multiple antenna elements with non-uniform horizontal spacing or non-uniform vertical spacing, that is, the future antenna array is in the horizontal direction. Or more than one spacing in the vertical direction. The first codebook may not be suitable for the hybrid antenna array, that is, there is no codebook matching the hybrid antenna array, which requires redesigning the codebook matching the hybrid antenna array. The codebooks corresponding to different hybrid antenna arrays may also be different. If the terminal randomly selects the codebook to feed back CSI to the base station, better system performance may not be guaranteed. Alternatively, even if multiple hybrid antenna arrays share the same codebook, the antenna ports are numbered in the order of column first, then row and then repolarization, and there may be multiple port orders. The system performance corresponding to different port sequences is also different. If the terminal arbitrarily selects one of the port sequences from multiple port sequences, the system performance corresponding to the selected port sequence may be poor. That is, the system performance of the terminal reporting CSI according to the selected port sequence is poor.

For example, referring to FIG. 8, there are 4 possible port orders for an antenna array including a two-port antenna element and a four-port antenna element. The dotted line in FIG. 8 shows a four-port antenna unit, and the four port sequences are port sequence 1, port sequence 2, port sequence 3, and port sequence 4, respectively. As shown in FIG. 8, a row is taken as an example, and the antenna ports are numbered in the order of column first, then row and then repolarization. It should be understood that if the four-port antenna is regarded as one row and two columns, then port order 1 or port order 2 can be obtained. Since the four-port antenna is regarded as a line, the numbering in the second polarization direction can be numbered from 9 in port sequence 1, or can be numbered from 9 in port sequence 2. If the four-port antenna is regarded as a row and a column, then the port order 3 or the port order 4 can be obtained. Similarly, since the four-port antenna is regarded as a line, the numbering in the second polarization direction can be numbered from 9 in port sequence 3, or can be numbered from 9 in port sequence 4. The four-port antenna is regarded as a column, so the number 2 starts from the two-port antenna adjacent to the four-port antenna. It should be understood that FIG. 8 only illustrates the possible port sequences in 4, and there are actually more than these 4 port sequences.

As far as the first codebook is concerned, among the four port sequences, for example, port sequence 3 has better system performance than the other three port sequences. However, when the terminal feeds back CSI to the base station, the port sequence 2 may be selected, that is, the terminal reports the CSI according to the port sequence 2 and the first codebook. In this case, the system performance is not optimal.

In view of this, the present application proposes a CSI feedback method, which can be applied to a communication system including a hybrid antenna array. For various hybrid antenna arrays, the network-side device may indicate the correspondence between the antenna ports corresponding to each hybrid antenna array and the CSI-RS ports, that is, specify the order of the antenna ports. Since the correspondence between the antenna port and the CSI-RS port indicated by the base station corresponds to the hybrid antenna array of the base station, it can be considered that the terminal sequentially feeds back CSI to the network side device based on the antenna port, which can ensure better system performance. In addition, the network-side device can indicate the corresponding antenna port sequence for the terminal for various antenna arrays, and can be compatible with various types of antenna arrays, which is beneficial to the design of the codebook and has a wider application range.

It should be understood that the embodiments of the present application aim to provide an antenna port indication method to be compatible with codebooks of various types of antenna arrays. It should be understood that the first codebook is matched with a conventional dual-polarized antenna array, and if other types of antenna arrays are equivalent to conventional dual-polarized antenna arrays, the first codebook can continue to be used. In this way, there is no need to redesign the first codebook, which is favorable for compatibility with the existing codebook. Therefore, in this embodiment of the present application, each type of antenna element can be equivalent to a different number of conventional dual-polarized antenna arrays, so that the first codebook is matched with various types of antenna arrays. For the first codebook, the base station can indicate the corresponding relationship between the antenna port and the CSI-RS port to the terminal according to the type of the antenna unit, and the terminal feeds back CSI to the base station according to the corresponding relationship and the first codebook, which can ensure a better system. performance.

It should be understood that, in this embodiment of the present application, "used for indicating" may include direct indicating and indirect indicating. For example, when describing a certain indication information for indicating information I, the indication information may directly indicate I or indirectly indicate I, but it does not mean that the indication information must carry I.

The information indicated by the indication information is called the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the information to be indicated. Indicating the index of information, etc. The information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be implemented by means of a pre-agreed (for example, a protocol stipulated) arrangement order of various information, so as to reduce the indication overhead to a certain extent. At the same time, the common part of each piece of information can also be identified and indicated uniformly, so as to reduce the indication overhead caused by indicating the same information separately.

In addition, the specific indication manner may also be various existing indication manners, such as, but not limited to, the above indication manner and various combinations thereof. For the specific details of the various indication modes, reference may be made to the prior art, and details are not described herein again. It can be seen from the above that, for example, when multiple pieces of information of the same type need to be indicated, different information may be indicated in different manners. In the specific implementation process, the required indication mode can be selected according to specific needs. The selected indication mode is not limited in this embodiment of the present application. In this way, the indication mode involved in the embodiment of the present application should be understood as covering the ability to make the indication to be indicated. Various methods for the party to learn the information to be indicated.

In addition, the information to be indicated may exist in other equivalent forms, and the technical solutions provided in the embodiments of the present application should be understood to cover various forms. For example, some or all of the features involved in the embodiments of the present application should be understood to cover various manifestations of the feature.

The information to be indicated may be sent together as a whole, or may be divided into multiple sub-information and sent separately, and the transmission periods and/or transmission timings of these sub-information may be the same or different. The specific sending method is not limited in this application. The sending period and/or sending timing of these sub-information may be predefined, for example, predefined according to a protocol, or configured by the transmitting end device by sending configuration information to the receiving end device. The configuration information may include, for example, but not limited to, radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling, and physical layer signaling, such as downlink control information (DCI) one or a combination of at least two.

The following describes a method for the hybrid antenna array to be equivalent to a conventional dual-polarized antenna array with reference to the accompanying drawings. In order to facilitate understanding, before introducing that the hybrid antenna array is equivalent to a traditional dual-polarized antenna array, take the equivalent of a four-port antenna as a dual-polarized antenna as an example, and first introduce the principle that a hybrid antenna array is equivalent to a traditional dual-polarized antenna array .

Please refer to FIG. 9 , which is a schematic diagram of the principle that QHA/QSA is equivalent to XPO in the same polarization direction. It should be understood that the polarization directions of two antenna elements in the four antenna elements of the four-port antenna unit QHA/QSA are the same, and the polarization directions of the other two antenna elements are the same. As shown in FIG. 9 , among the four antenna elements, the two diagonal antenna elements (the two antenna elements located in the rectangular frame in FIG. 9 ) have the same polarization directions. It should be understood that the two antenna elements in the same polarization direction have a phase difference. The phase difference between two antenna elements of the same polarization in the QHA/QSA antenna unit can be approximated as the phase difference between the two traditional XPO units due to the element spacing d_eff. That is, the two antenna elements of the same polarization in the QHA/QSA antenna unit can be equivalent to the two antenna elements of the same polarization of the traditional two XPO antenna units. The equivalent physical distance between the two antenna elements of the same polarization in the two XPO antenna units is d_eff, that is, the physical distance between the two XPO antenna units is d_eff. The amplitude patterns of the two antenna elements of the same polarization in the equivalent two XPO antenna units are the same, and the phase difference is the phase difference caused by the steering vector corresponding to d_eff. Similarly, a QHA/QSA unit can be equivalent to two dual-polarized antenna units with a physical distance of d_eff.

In the embodiment of the present application, it is assumed that an antenna array includes a four-port antenna unit, then the two antenna elements of the four-port antenna unit can be equivalent to a two-port antenna unit. It should be understood that the two antennas of the four-port antenna unit The oscillators come from different polarization directions. For example, the four-port antenna unit includes a first antenna element, a second antenna element, a third antenna element, and a fourth antenna element, wherein the first antenna element and the third antenna element are located in a first polarization direction, and the second antenna element The element and the fourth antenna element are located in the second polarization direction. In this embodiment of the present application, the first antenna element and the second antenna element may be equivalent to one two-port antenna unit, and correspondingly, the third antenna element and the fourth antenna element may be equivalent to another two-port antenna unit. In other words, two antenna elements of a four-port antenna element in one polarization direction are equivalent to two antenna elements of two two-port antenna elements in this polarization direction, and one two-port antenna element corresponds to one of the antennas vibrator.

For example, please refer to FIG. 10 , which is a schematic diagram of a hybrid antenna array equivalent to a conventional dual-polarized antenna. FIG. 10 takes a hybrid antenna array including one row and 3 columns of QSA, 4 columns of XPO and 3 columns of QSA as an example. It should be understood that the 3 QHAs and the 3 QSAs in the hybrid antenna array are equivalent to 12 XPOs in total, so the hybrid antenna array can be equivalent to a row of 16 columns of XPOs on the horizontal to a certain extent. It should be noted that FIG. 10 takes the horizontal interval between adjacent QSAs as d1, the horizontal interval between QSAs and adjacent XPOs as d2, and the horizontal interval between two adjacent XPOs as d3 as an example. In FIG. 10 , the four antenna elements of the four-port antenna unit (the antenna element indicated by the dashed box in FIG. 10 ) are in the same pole (two of the antenna elements are indicated by thick lines, and the other two antenna elements are indicated by thin lines) The phase difference of the two antenna elements in the direction of azimuth can be approximated as the phase difference of the traditional two XPOs due to the element spacing d_eff. As shown in Fig. 10, the two antenna elements indicated by the thin line are located in the same polarization direction, the two antenna elements indicated by the thick line are located in the other polarization direction, and one antenna element indicated by the thick line and one antenna indicated by the thin line are located in the same polarization direction. The antenna element is equivalent to the XPO antenna element indicated by the thick or thin line. The physical spacing of the virtual equivalent 2 XPO antenna elements within the QHA/QSA is d_eff. It should be understood that in Fig. 10, the antenna array is distributed symmetrically on the left and right sides, and the right half of Fig. 10 can refer to the left half of Fig. 10.

FIG. 10 only illustrates one of the equivalent methods. In a specific implementation, the method in which the four-port antenna unit is equivalent to the second-port antenna unit may include the following multiple equivalent methods. Please refer to FIG. 11 , which is a schematic diagram of four equivalent methods in which a four-port antenna unit is equivalent to a two-port antenna unit. Figure 11 illustrates four equivalent methods, wherein the two antenna elements indicated by the thick lines in the four-port antenna in Figure 11 are two antenna elements in the same polarization direction, which are equivalent to two two-port antenna elements in different polarities. Two antenna elements in the direction of polarization (indicated by thick lines). Similarly, the two antenna elements indicated by the thin lines in the four-port antenna in Fig. 11 are also two antenna elements in the same polarization direction, which are equivalent to two two-port antenna elements in another different polarization direction. Antenna element (illustrated by thin line).

Exemplarily, in the first equivalent method, after the four-port antenna unit is equivalent to two two-port antenna units, the positions of the four antenna elements of the four-port antenna unit are changed. For example, a two-port antenna equivalent to a four-port antenna unit in one polarization direction and a two-port antenna equivalent to a four-port antenna unit in another polarization direction are distributed in rows. In other words, the four-port antenna unit is equivalent to two two-port antennas placed horizontally. It should be noted that the embodiments of the present application do not limit the placement positions of the two-port antennas, that is, FIG. 11 shows that two two-port antennas are placed in the upper row. In some embodiments, the two two-port antennas may also be placed on the following line.

Equivalent method two, after the four-port antenna unit is equivalent to two two-port antenna units, the positions of the four antenna elements of the four-port antenna unit are changed. For example, a two-port antenna equivalent to a four-port antenna unit in one polarization direction and a two-port antenna equivalent to a four-port antenna unit in another polarization direction are distributed along the diagonal. In other words, the four-port antenna unit is equivalent to two two-port antennas placed diagonally. As shown in Figure 11, the two two-port antennas are placed at the upper left position and the lower right position, respectively. It should be noted that FIG. 11 shows a diagonal placement of the two two-port antennas. In other embodiments, the two two-port antennas may also be placed in another diagonal direction, that is, two two-port antennas The port antennas are placed in the upper right position and the lower left position (shown in Figure 11), respectively.

Equivalent method three, after the four-port antenna unit is equivalent to two two-port antenna units, the positions of the four antenna elements of the four-port antenna unit are changed. For example, a two-port antenna equivalent to a four-port antenna unit in one polarization direction and a two-port antenna equivalent to a four-port antenna unit in another polarization direction are distributed in columns. In other words, the four-port antenna unit is equivalent to two two-port antennas placed vertically. It should be noted that this embodiment of the present application does not limit the placement positions of the two-port antennas, that is, FIG. 11 shows that the two two-port antennas are placed in the left column. In some embodiments, the two two-port antennas may also be placed in the right column.

Equivalent method four, after the four-port antenna unit is equivalent to two two-port antenna units, the positions of the four antenna elements of the four-port antenna unit do not change, that is, the four antenna elements included in the four-port antenna unit are distributed respectively. at the four ends (four corners). The difference is that the positions of the two antenna elements of any two-port antenna after equivalence are different, that is, the positions of each antenna element are different.

The equivalent method may be indicated to the terminal device by the network device, or may be predefined by the protocol, which is not limited in this application.

Please refer to FIG. 12 , which is a schematic diagram of a hybrid antenna array equivalent to a dual-polarized antenna array. The hybrid antenna array includes a row of 6-column antenna elements, wherein the 6-column antenna elements sequentially include 1 column of four-port antenna elements, 4 columns of XPO antenna elements and 1 column of four-port antenna elements from left to right. Among them, FIG. 12 shows the XPO antenna after using the four equivalent methods shown in FIG. 11 to be equivalent to the hybrid antenna array.

It should be noted that FIGS. 10-12 only take an example that a four-port antenna unit is equivalent to a two-port antenna unit. This embodiment of the present application does not limit the number of ports that need to be equivalent to a two-port antenna unit. For example, an eight-port antenna unit can also be equivalent to a two-port antenna unit. It should be understood that, similar to the method in which a four-port antenna unit is equivalent to a two-port antenna unit, an eight-port antenna unit can be equivalent to two four-port antenna units, and then each four-port antenna is equivalent to two two-port antenna units. . Therefore, following the method that the four-port antenna elements are equivalent to two-port antenna elements, the antenna elements with any number of ports can be equivalent to the traditional dual-polarized antenna arrays with different numbers.

It should be understood that the hybrid antenna array is equivalent to an XPO antenna unit, and the horizontal intervals between the equivalent XPO antenna units may be the same or different. Similarly, the vertical intervals between the equivalent XPO antenna units may be the same or different. However, the first codebook is matched with antenna elements with uniform horizontal and vertical spacing, and may not be suitable for antenna elements distributed with non-uniform spacing. Therefore, in some embodiments, the codebook may be redesigned for the equivalent XPO antenna elements. For the convenience of description, the codebook redesigned for the equivalent XPO antenna unit is referred to as the second codebook hereinafter. It should be understood that the second codebook is matched with a hybrid antenna array equivalent to an XPO antenna unit. For the second codebook, the base station may also indicate the correspondence between the antenna port and the CSI-RS port for the terminal. The terminal may send the CSI to the base station according to the indication and the second codebook. Since the antenna port is selected based on the second codebook, the terminal sends CSI to the base station according to the indication of the antenna port and the second codebook, which can ensure system performance.

Based on the various design solutions of the hybrid antenna array and/or the various design solutions of the codebook, an embodiment of the present application provides a method for feeding back channel state information. Please refer to FIG. 13 , which is a flowchart of the method. In the following introduction process, the method is applied to the network architecture shown in FIG. 1 as an example. Additionally, the method may be performed by two communication devices, eg, a first communication device and a second communication device. Wherein, the first communication device may be a network device or a communication device capable of supporting the functions required by the network device to realize the method, or the first communication device may be a terminal or a communication device capable of supporting the functions required by the terminal to realize the method, of course Other communication devices are also possible, such as a chip or a system of chips. The same is true for the second communication device, the second communication device may be a network device or a communication device capable of supporting the functions required by the network device to implement the method, or the second communication device may be a terminal or a communication device capable of supporting the terminal to implement the method. Of course, the functional communication device may also be other communication devices, such as a chip or a chip system. There is no restriction on the implementation of the first communication device and the second communication device. For example, the first communication device may be a network device, the second communication device may be a terminal, or both the first communication device and the second communication device may be terminals. Or the first communication device is a network device, the second communication device is a communication device capable of supporting the functions required by the terminal to implement the method, and so on.

For ease of introduction, hereinafter, the method is performed by a network device and a terminal as an example, that is, the first communication device is a terminal, the second communication device is a network device, and the network device is a base station as an example. For example, the terminal in the following may be any one of the six terminals in FIG. 1 , and the network device in the following may be the network device in FIG. 1 . It should be noted that, the embodiments of the present application only take execution through network devices and terminals as an example, and are not limited to this scenario.

The flow of the channel state information feedback method provided by the embodiment of the present application is described as follows.

S1301. The base station sends first indication information to the terminal, and the terminal receives the first indication information, where the first indication information is used to indicate the correspondence between the antenna port and the CSI-RS port.

S1302. The terminal sends CSI to the base station according to the first indication information, and the base station receives the CSI.

S1303, the base station sends data to the terminal according to the CSI fed back by the terminal.

The embodiments of the present application are applicable to a communication system including the aforementioned hybrid antenna array. When the antenna array of the base station is a hybrid antenna array, if the order of column first, then row and then re-polarization is used as the antenna number, there may be various correspondences between the antenna ports and the CSI-RS ports. In addition, for different hybrid antenna arrays, the corresponding relationship between the antenna ports and the CSI-RS ports may also be different. For this reason, in the embodiment of the present application, when the base station needs the terminal to feed back CSI, it needs to inform the terminal of the corresponding relationship between the antenna port to be used and the CSI-RS port, so that the order of compatibility with the first column and then the row and then the repolarization is the antenna number. . In addition, the correspondence between the antenna port indicated by the base station and the CSI-RS port corresponds to the antenna array used by the base station, so better system performance can be guaranteed. And the method can be applied to communication systems of various antenna arrays, that is, compatible with various types of antenna arrays, and has a wider application range.

Since there are various hybrid antenna arrays, each hybrid antenna array can be equivalent to a dual-polarized antenna array in this embodiment of the present application, which is compatible with various types of antenna arrays. For an equivalent dual-polarized antenna array, the embodiments of the present application may further construct a mapping relationship between antenna ports and CSI-RS ports.

For example, please refer to FIG. 14 , which is a schematic diagram of a hybrid antenna array equivalent to a virtual dual-polarized antenna array. Wherein, the matrix with the dimension M*N shown in FIG. 14 can be considered as an equivalent virtual dual-polarized antenna array, that is, the virtual dual-polarized antenna array is a matrix with M rows and N columns (hereinafter referred to as the first matrix). Each element included in the first matrix (as shown in the intersection of any row and any column in FIG. 14 ) may correspond to one antenna element or antenna element. In this embodiment of the present application, whether the element has a corresponding antenna unit or antenna element can be characterized by the value of the element. Exemplarily, in FIG. 14 , if the value of an element is 0, then the element has a corresponding antenna unit or antenna element (“X” in FIG. 14 ); on the contrary, the value of this element is 1, then the element has no corresponding antenna element or antenna element. In other words, if the value of an element is 0, then the corresponding antenna element or antenna element (“X” in Figure 14) is selected. On the contrary, if the value of this element is 1, then the The antenna element or antenna element corresponding to the element is not selected. This is just an example. If the value of an element is 1, then the antenna element or antenna element corresponding to this element is selected. On the contrary, if the value of this element is 0, then the antenna element or antenna element corresponding to this element is selected. The antenna element is not selected. It should be understood that if a certain antenna element is selected, the port (antenna port) of that antenna element is used to transmit the signal. Similarly, if a certain antenna element is selected, the port of the antenna element is used to send signals. From this perspective, the first matrix shown in FIG. 14 can also be considered as a virtual antenna port, which can be used to indicate the mapping relationship between antenna ports and CSI-RS ports. It can be understood that considering that there are different types of antenna elements or antenna elements in the hybrid antenna array, the spacing between the antenna elements or antenna elements may also be uneven, so for various hybrid antenna arrays, it can be equivalent to a virtual dual polarization. The antenna array (which is the first matrix, the rows and columns are evenly distributed), and by indicating whether there are corresponding antenna elements or antenna elements on the elements in the first matrix, so as to realize the indication of the order of the antenna ports or antenna elements of the hybrid antenna array, and also It is to indicate the order in which the antenna ports of the hybrid antenna array perform CSI-RS port mapping, which is equivalent to indicating the correspondence between the antenna ports and the CSI-RS ports.

The embodiment of the present application can indicate the corresponding relationship between the antenna port and the CSI-RS port for the terminal according to the mapping relationship between the antenna port and the CSI-RS port similar to that shown in FIG. 14 , which can be applied to indicate the antenna port in various hybrid antenna arrays. Correspondence with CSI-RS ports. That is, in this embodiment of the present application, the hybrid antenna array is equivalent to a two-port antenna array, and then the two-port antenna array is mapped to the first matrix, so that there is a first matrix that is compatible with these various hybrid antenna arrays. Since the hybrid antenna array is equivalent to a two-port antenna array, for a two-port antenna array, as shown in Figure 7, the antenna ports and CSI- The corresponding relationship of the RS ports, that is, the fixed order of the antenna ports. Therefore, the equivalent two-port antenna array is mapped to the first matrix. By indicating the antenna ports corresponding to the CSI-RS ports in the first matrix, the order of the antenna ports in various hybrid antenna arrays can be indicated, that is, the hybrid antenna array is indicated. Correspondence between antenna ports and CSI-RS ports.

For example, please refer to FIG. 15 , which is a schematic diagram of a hybrid antenna array equivalent to a virtual dual-polarized antenna array. The hybrid antenna array includes 2 rows and 3 columns of antenna units, wherein the 3 columns of antenna units include 1 column of four-port antenna units and 2 columns of XPO antenna units in sequence from left to right. 15 shows a first antenna array obtained by using the equivalent method shown in FIG. 11 , an equivalent hybrid antenna array, that is, including 2 rows and 4 columns of XPO antennas. Fig. 15 takes the same interval between any two columns in an XPO antenna array of 2 rows and 4 columns as an example. It can be seen from Figure 15 that the four-port antenna in the 1st row, 1st column and 1st column in the hybrid antenna array is equivalent to the XPO antennas in the 1st row, 1st column and 1st row, 2nd column in the first antenna array. The hybrid antenna array The four-port antenna in the 2nd row and 1st column is equivalent to the XPO antennas in the 2nd row, 1st column and 2nd row, 2nd column in the first antenna array. The first antenna array is mapped to the first matrix 1, that is, a matrix of 2 rows and 4 columns. Wherein, the intersection of any row and any column in the first matrix 1 represents an antenna unit or antenna element. It should be understood that the antenna elements located in the first row and the first column and the first row and the second column in the first matrix 1 correspond to the four-port antennas in the first row in the hybrid antenna array. If the base station indicates that the antenna ports corresponding to the CSI-RS ports correspond to the antenna elements located in the 1st row, 1st column and the 1st row, 2nd column in the first matrix 1, it can be determined that the antenna ports corresponding to the CSI-RS ports are hybrid Antenna port for the four-port antenna in row 1 of the antenna array.

FIG. 15 also illustrates a second antenna array obtained by using the three-equivalent hybrid antenna array of the equivalent method illustrated in FIG. 11 , that is, including 4 rows and 2 columns of XPO antennas. Fig. 15 takes the same interval between any two rows in an XPO antenna array of 2 rows and 4 columns as an example. It can be seen from Figure 15 that the four-port antenna in the 1st row, 1st column and 1st column in the hybrid antenna array is equivalent to the XPO antennas in the 1st row, 1st column and 2nd row, 1st column in the first antenna array. The hybrid antenna array The four-port antenna in the 2nd row and 1st column is equivalent to the XPO antennas in the 3rd row, 1st column and 4th row, 1st column in the second antenna array. Moreover, the two-port antenna in the first row and the second column in the hybrid antenna array is equivalent to the two-port antenna in the first row and the second column in the second antenna array, the two-port antenna in the second row and the second column in the hybrid antenna array, etc. The effect is the two-port antenna in row 3 and column 2 in the second antenna array; the two-port antenna in row 1 and column 3 in the hybrid antenna array is equivalent to the two-port antenna in row 2 and column 2 in the second antenna array. , the two-port antenna in the second row and the third column in the hybrid antenna array is equivalent to the two-port antenna in the fourth row and the second column in the second antenna array. The second antenna array is mapped to the first matrix 2, and the intersection of any row and any column in the first matrix 2 indicates an antenna element or antenna element. It should be understood that the antenna elements located in the first row and the first column in the first matrix 2 correspond to the four-port antennas in the first row in the hybrid antenna array. If the base station indicates that the antenna port corresponding to the CSI-RS port corresponds to the antenna element located in the first row and the first column in the first matrix 2, then it can be determined that the antenna port corresponding to the CSI-RS port is the one in the first row in the hybrid antenna array. Antenna port for a four-port antenna.

It should be noted that the hybrid antenna array shown in FIG. 15 can also be mapped to the first matrix of other dimensions. For example, the hybrid antenna array is equivalent to an XPO antenna array with 2 rows and 8 columns. The spacing between the two columns is the same. It should be understood that the interval between any two columns in the XPO antenna array with 2 rows and 8 columns is different from the interval between any two columns in the XPO antenna array with 2 rows and 4 columns. Mapping the first antenna array to the first matrix 3, that is, an XOP antenna array of 2 rows and 8 columns, it should be understood that only 4 of the 8 columns of XPO antennas correspond to the actual antenna elements in the hybrid antenna array, for example, from left to right, In the 8-column XPO antenna array, the antenna elements shown in the first and third columns correspond to the four-port antennas in the hybrid antenna array, and the antenna elements shown in the fifth column correspond to the two-port antennas in the second column of the hybrid antenna array respectively. , the antenna elements shown in the seventh column correspond to the two-port antennas in the third column in the hybrid antenna array respectively. By indicating the selected antenna elements (ie, the 1st, 3rd, 5th and 7th column antenna elements) in the first matrix 3 (ie, 2 rows and 8 columns XPO antenna array), the actual antenna elements (antenna elements) in the hybrid antenna array can be indicated. port). It can be seen that the embodiments of the present application can be applied to each A hybrid antenna array.

Specifically, in the embodiment of the present application, the base station may notify the terminal of the correspondence between the antenna port and the CSI-RS port through the first indication information. In a possible implementation manner, the first indication information may be carried in one or more fields of the existing signaling, which facilitates compatibility with the existing signaling. For example, the first indication information is carried in radio resource control (radio resource control, RRC) signaling, media access control element (media access control control element, MAC CE) signaling, downlink control information (downlink control information, DCI) signaling, etc. . The above-mentioned one or more fields may be fields defined in RRC signaling, fields defined in MAC CE signaling, or fields defined in DCI signaling, or may be newly defined RRC fields, MAC CE fields, or DCI fields. In this regard, the embodiments of the present application are not limited. Of course, the first indication information may also be carried in newly defined signaling.

It should be understood that, due to the existence of various hybrid antenna arrays, the dimensions of the first matrix equivalent to different hybrid antenna arrays are also different, so the implementation manner of the corresponding first indication information may also be different. Several possible implementation manners of the first indication information are respectively introduced below.

Implementation manner 1. The first indication information includes first information and second information, where the first information may be used to indicate an antenna port corresponding to a CSI-RS port in the first matrix, and the second information is used to indicate the first matrix. Since the first matrix corresponds to the hybrid antenna array, it can also be considered that the first indication information can be used to indirectly indicate the antenna port corresponding to the CSI-RS port in the hybrid antenna array.

For example, the first indication information is carried in RRC signaling, the first information may be carried in a first field in the RRC signaling, and the first field occupies K bits, that is, the first information may be a sequence of K bits. The value of K is related to the dimension of the first matrix. For example, the dimension of the first matrix is M rows*N columns, then K may be equal to M*N. Each element can be mapped to the first matrix according to the rule of row first, then column (or row first, then row), so as to determine whether there is an antenna port corresponding to the CSI-RS port according to the value of the corresponding element. Since the same bit sequence may correspond to multiple first matrices, for example, K=M*N, the dimension of the first matrix may be M rows*N columns, or N rows*M columns. Therefore, in this embodiment of the present application, in addition to indicating the first information, the base station may also indicate the second information, that is, the dimension of the first matrix is indicated by the second information. The second information may be carried in one field, or may be carried in multiple fields.

As an implementation manner of the second information, the second information is carried in multiple fields, for example, the second information may be carried in the second field and the third field, and both the second field and the third field may occupy multiple bits. Wherein, the second field is used to indicate the horizontal dimension (row) of the first matrix, and the third field is used to indicate the vertical dimension (column) of the first matrix; or, the second field is used to indicate the vertical dimension (column) of the first matrix ), the third field is used to indicate the horizontal dimension (row) of the first matrix. This way can also be understood as a direct indication way of the dimension of the first matrix.

For ease of understanding, K=8 below, the first information is "00110011", the second field and the third field both occupy 4 bits, and the second field is used to indicate the horizontal dimension of the first matrix, and the third field is used for Taking the indication of the vertical dimension of the first matrix as an example, an implementation manner of the first indication information is introduced.

Exemplarily, the value carried by the first field is "00110011", the value carried by the second field is "0010", and the value carried by the third field is "0100", that is, M=2, N=4. The terminal receives the first indication information and maps it to the first matrix according to the rule of first row and then column, and the following first matrix W1 can be obtained:

If 1 represents the unselected antenna element or antenna element, 0 represents the selected antenna element or antenna element. Then the terminal can determine that the antenna ports corresponding to the CSI-RS ports are in the hybrid antenna array corresponding to the antenna elements or antenna elements indicated by the positions in the 1st row, 1st column and 2nd row, 1st column in the first matrix. the antenna port. Taking the hybrid antenna array shown in FIG. 15 as an example, the first antenna array is equivalent to the first antenna array through an equivalent method. In the first matrix 1, the antenna element located in the first row and the first column corresponds to the four-port antenna in the first row and the first column in the hybrid antenna array, so it can be determined that the antenna port corresponding to the CSI-RS port includes the first row in the hybrid antenna array. Antenna port for four-port antenna in row 1, column 1. Similarly, the antenna element located in the second row, the first column in the first matrix 1 corresponds to the four-port antenna in the second row and the first column in the hybrid antenna array, so it can be determined that the antenna port corresponding to the CSI-RS port also includes the hybrid antenna. The antenna port of the four-port antenna at row 2, column 1 in the array.

Exemplarily, the value carried in the first field is "0101010101010101", the value carried in the second field is "0010", and the value carried in the third field is "1000", that is, M=2, N=8. The terminal receives the first indication information and maps it to the first matrix according to the rule of first row and then column, and the following first matrix W1 can be obtained:

If 1 represents the unselected antenna element or antenna element, 0 represents the selected antenna element or antenna element. Then the terminal can determine that the antenna port corresponding to the CSI-RS port is the antenna in the hybrid antenna array corresponding to the antenna unit or the antenna element indicated by the positions located in the first matrix, the 1st, 3rd, 5th, and 7th columns in the first matrix port. Taking the hybrid antenna array shown in FIG. 15 as an example, the first antenna array is equivalent to the first antenna array through an equivalent method. The antenna elements located in the 1st row, 1st row, 3rd row, 5th row, and 7th row in the first matrix 3 correspond to the antenna elements in the 1st row, 1st row, 1st row, 2nd row and 3rd row in the hybrid antenna array, so the corresponding CSI-RS ports can be determined. The antenna ports include the antenna ports of the four-port antenna in the first row and the first column and the antenna ports of the two-port antenna in the second and third columns in the hybrid antenna array. Similarly, the antenna elements located in the 1st, 3rd, 5th, and 7th columns of the 2nd row in the first matrix 3 correspond to the antennas of the 2nd row, 1st, 2nd, and 3rd columns of the hybrid antenna array, so the CSI-RS port can be determined. The corresponding antenna ports also include the antenna ports in the second row, the first, the second, and the third column in the hybrid antenna array.

It should be understood that the embodiments of the present application take the hybrid antenna array shown in FIG. 15 as equivalent to two first matrices with different dimensions as an example. If there are multiple hybrid antenna arrays, in this embodiment of the present application, the hybrid antenna array is equivalent to a two-port antenna array, and then the two-port antenna array is mapped to the first matrix. matrix. In this embodiment of the present application, the first indication information indicates the antenna ports corresponding to the CSI-RS ports in the first matrix, which can indicate the correspondence between the antenna ports and the CSI-RS ports in various hybrid antenna arrays, that is, indicate the antenna ports in the hybrid antenna array. port order.

Or, the terminal receives the first indication information and maps it to the first matrix according to the rule of first column and then row, to obtain the following first matrix W1:

The terminal may determine, according to W1, that the antenna ports corresponding to the CSI-RS ports are the antenna ports corresponding to the antenna elements or antenna elements located in the first column and the third column in the first matrix.

Exemplarily, the value carried by the first field is "00110011", the value carried by the second field is "0100", and the value carried by the third field is "0010", that is, M=4, N=2. The terminal receives the first indication information, maps it to the first matrix according to the rule of first row and then column, and obtains the following first matrix:

The terminal may determine, according to W1, that the antenna ports corresponding to the CSI-RS ports are the antenna ports corresponding to the antenna elements or antenna elements located in the first row and the third row in the first matrix.

Alternatively, the terminal receives the first indication information and maps it to the first matrix according to the rule of columns first, then rows, to obtain the following first matrix:

The terminal may determine, according to W1, that the antenna ports corresponding to the CSI-RS ports are the antenna ports corresponding to the antenna elements or antenna elements located in the first row and the second row in the first matrix.

It should be noted that the mapping rule for mapping the antenna ports to the first matrix, such as row-first-column-first-row or column-first-row may be predefined, or agreed by the base station and the terminal, or informed by the base station to the terminal. The embodiment is not limited.

As another implementation manner of the second information, the second information may be carried in one field, such as a fourth field, and the fourth field may occupy multiple bits. The value of the fourth field is used to indicate the dimension of the first matrix. Different values of the fourth field represent first matrices of different dimensions. For example, the fourth field occupies 4 bits, the value of the fourth field is "0000", which represents the first matrix of 2*4; the value of the fourth field is "0001", which represents the first matrix of 4*2; The value of the four fields is "0010", which means the first matrix of 3*3, and so on. This way can also be understood as an indirect indication way of the dimension of the first matrix. In this way, the number of bits occupied by the second information is less, and resource overhead can be saved as much as possible.

The following takes the fourth field occupying 4 bits as an example, the value of the fourth field is 0000, which represents the first matrix of 2*4; the value of the fourth field is 0001, which represents the first matrix of 4*2 as an example. The above example is continued, that is, the value carried by the first field is "00110011", and the value carried by the fourth field is "0000", that is, M=2, N=4. Mapping to the first matrix according to the rule of first row and then column, the following first matrix W1 can be obtained:

That is, the value carried by the first field is "00110011", and the value carried by the fourth field is "0001", that is, M=4, N=2. Mapping to the first matrix according to the rule of first row and then column, the following first matrix W1 can be obtained:

Implementation manner 2: The first indication information includes first information, where the first information is used to indicate the antenna port corresponding to the CSI-RS port in the first matrix. Since the first matrix corresponds to the hybrid antenna array, it can also be considered that the first indication information can be used to indirectly indicate the antenna port corresponding to the CSI-RS port in the hybrid antenna array.

Although the same bit sequence may correspond to first matrices of different dimensions, in some embodiments, the dimension of the first matrix corresponding to the bit sequence may be specified. In this way, the base station does not need to indicate the first matrix for the terminal, and the terminal can also determine the first matrix, thereby saving signaling overhead.

Exemplarily, following the above example, the first information is a K-bit sequence, K=M*N, and the protocol may specify that M is less than or equal to N. For example, the value carried in the first field is "00110011". Since M is less than or equal to N, the terminal receives the first indication information and can determine that the dimension of the first matrix is 2*4, not 4*2. According to the first information, the terminal maps the antenna ports to the first matrix according to the rule of first row and last column, and the following matrix W1 can be obtained:

Further, the terminal may determine that the antenna ports corresponding to the CSI-RS ports are the antenna ports corresponding to the antenna elements or antenna elements located in the first row, the first and second columns, and the second row, and second columns in the first matrix.

The third implementation is different from the first and second implementations above in that, after the hybrid antenna array is equivalent in the embodiment of the present application, an equivalent antenna array is obtained, and the antennas in the equivalent antenna array can be indicated by indicating The corresponding relationship between the port and the CSI-RS port is realized to indicate the corresponding relationship between the antenna port and the CSI-RS port in the hybrid antenna array. That is to say, it is not necessary to map the equivalent antenna array to the first matrix, and the corresponding relationship between the antenna ports and the CSI-RS ports in the hybrid antenna array also does not need to be indicated by the first matrix. In this case, the first indication information may include first information, and the first information may be used to indicate the correspondence between the antenna ports of the equivalent antenna array and the CSI-RS ports, that is, it can indicate the antennas in the hybrid antenna array Correspondence between ports and CSI-RS ports. It can also be said that the first information is used to indicate the order of the antenna ports. Compared with the first and second implementations, the third implementation is a relatively direct indication, that is, the first information is used to indicate the correspondence between the antenna ports and the CSI-RS ports in the hybrid antenna array.

Exemplarily, the first information may be carried in a field of the RRC signaling, for example, the first field, where the first field occupies multiple bits. For example, there are 32 antenna ports, and the first information may indicate the order of the 32 antenna ports in the order of row first, column first, or row first. If the number of CSI-RS ports corresponding to the antenna ports is also 32, the first information may indicate 32 values, each value corresponds to an antenna port, the first 16 values correspond to the order of the antenna ports in the first polarization direction, and the last 16 values The values correspond to the order of the antenna ports in the second polarization direction. Exemplarily, one value may occupy 4 bits, and the first field may occupy 32*4=128 bits. The first field carrying bit sequence can be [3, 5, 12, 16, 13, 7, 9, 8, 0, 1, 4, 2, 11, 14, 6, 10, 18, 20, 16, 17, 21 , 23, 31, 28, 27, 26, 24, 22, 29, 19, 25, 30], of which, [3, 5, 12, 16, 13, 7, 9, 8, 0, 1, 4, 2 , 11, 14, 6, 10] correspond to the order of the antenna ports in the first polarization direction, [18, 20, 16, 17, 21, 23, 31, 28, 27, 26, 24, 22, 29, 19, 25, 30] correspond to the order of the antenna ports in the second polarization direction. The antenna ports are numbered in the order of first row and then column repolarization, and the antenna port sequence shown in Figure 16 can be obtained. It should be noted that, if the order of the antenna ports in the first polarization direction is the same as the order of the antenna ports in the second polarization direction. Following the above example, the first information may indicate 16 values. That is, the first field may occupy 16*4=64 bits.

If the number of CSI-RS ports corresponding to the antenna ports is also 8, that is, multiple antenna ports (a group of antenna ports) correspond to one CSI-RS port. In this case, the first information may indicate 8 values, and each value corresponds to a group of antenna ports. The first four values correspond to the order of the antenna ports in the first polarization direction, and the last four values correspond to the order of the antenna ports in the second polarization direction. Exemplarily, a value may occupy 4 bits, and the first field may occupy 8*4=32 bits. The bit sequence carried in the first field may be [2, 5, 3, 0, 1, 4, 6, 7], where [2, 5, 3, 0] corresponds to the order of the antenna ports in the first polarization direction, [ 1, 4, 6, 7] correspond to the order of the antenna ports in the second polarization direction. It should be understood that which antenna ports correspond to the CSI-RS ports as a group of antenna ports can be determined by the terminal through the beam sent by the base station to the terminal. Therefore, the terminal can determine the correspondence between the antenna ports and the CSI-RS ports in the hybrid antenna array through the first indication information.

In this embodiment of the present application, the antenna elements included in the hybrid antenna array may be unevenly spaced horizontally and/or vertically spaced. When the terminal receives the first indication information, if the antenna ports are mapped to the first matrix according to the uniform horizontal and vertical intervals between the antenna units, various mapping results may appear. In this way, the antenna ports and CSI-RS determined by the terminal are The port correspondence may be wrong.

For ease of understanding, please refer to FIG. 17 , which is a schematic diagram of a hybrid antenna array equivalent to a virtual dual-polarized antenna array (first matrix). FIG. 17 takes as an example that the antenna elements included in the hybrid antenna array are not uniformly spaced in the horizontal direction. It should be understood that the dimension of the first matrix is 2 rows*4 columns. As shown in Figure 17, the numbering of rows and columns starts from 0, the interval between the antenna elements in the first column and the antenna elements in the second column is d1, and the distance between the antenna elements in the second column and the antenna elements in the third column is d1. The interval between them is d2, the interval between the antenna elements in the third column and the antenna elements in the fourth column is d3, and d1 is not equal to d2 and d3, and d2 is not equal to d3.

Since d1, d2, and d3 are not equal, the terminal receives the first indication information and maps the antenna ports to the first matrix, and there may be various mapping situations. For example, the value carried in the first field is "11001100", assuming that d1 is 0.5 wavelengths (λ), and d2 is 1 λ. Following the existing design, usually the horizontal interval between two adjacent antenna units is 0.5 λ. When the terminal receives the first indication information and maps the antenna ports to the first matrix, there may be various mapping results. For example, the terminal maps the antenna ports to the first matrix according to the first row and then the column, and the element "0" represents the selected antenna element. When the antenna ports are distributed at equal intervals among the antenna elements and are mapped to the first matrix, that is, the interval between the antenna elements is 0.5λ, then the antenna ports that should be located in the 1st row and the 3rd column (Figure 17, the dotted line antenna element "X ”) is mapped to the 1st row, and the middle position of the 2nd column and the 3rd column (Fig. 17 shows the dotted line between the 2nd column and the 3rd column). Since the position corresponding to the mapped antenna port is located between the second and third columns, and since the second and third columns are adjacent, it can be considered that the antenna port is located in the second column (in Figure 17, the solid line antenna element "X" ”), it can also be considered that the antenna port is located in the 3rd column (indicated by the dotted line antenna element “X” in FIG. 17 ). That is, the same antenna port may be mapped to different positions, which results in a non-unique correspondence between the antenna port and the CSI-RS port, which ultimately leads to poor system performance.

To this end, in this embodiment of the present application, the first indication information may further include third information, where the third information is used to indicate the interval in the horizontal direction between any two adjacent antenna elements included in the antenna array, and to indicate the antenna The interval between any two adjacent antenna elements included in the array in the vertical direction. In this way, it is compatible with the antenna array composed of antenna elements distributed at uneven intervals, and has a wider application range and can ensure system performance at the same time.

In some embodiments, the third information may directly indicate the distance between two adjacent rows in the first matrix and the distance between two adjacent columns in the first matrix. It should be understood that the interval in the horizontal direction between any two adjacent columns of antenna elements in the first matrix is an integer multiple of the distance between two adjacent columns in the first matrix, and the distance between any adjacent two rows of antenna elements in the first matrix is an integer multiple. The spacing in the vertical direction is an integer multiple of the distance between two adjacent rows in the first matrix. Since each element included in the first information can be mapped to the first matrix according to the rule of row before column (or column first, row first), the antenna port corresponding to the CSI-RS port is determined according to the value of the corresponding element. Therefore, combined with the third information, the horizontal distance and the vertical distance of two adjacent antenna elements in the antenna array can be determined. From this perspective, the third information can indirectly indicate the interval between any two adjacent antenna elements included in the antenna array in the horizontal direction, and the interval between any two adjacent antenna elements included in the antenna array in the vertical direction . For convenience of description, the distance between two adjacent rows in the first matrix may be referred to as a vertical unit distance, and the distance between two adjacent columns in the first matrix may be referred to as a horizontal unit distance.

It should be understood that the same antenna array can be equivalent to a first matrix of different dimensions. For example, an antenna array of 2*4 dimensions can be equivalent to a first matrix of 2*4 dimensions, or it may be equivalent to a first matrix of 4*8 dimensions. a matrix. If the interval between any two adjacent antenna elements included in the antenna array in the horizontal direction and the interval between any two adjacent antenna elements in the vertical direction are directly indicated, the larger the dimension of the first matrix, the greater the signaling overhead. bigger. However, in this embodiment of the present application, the third information indicates the horizontal unit distance and the vertical unit distance of the first matrix, so as to indirectly indicate the interval in the horizontal direction between any two adjacent antenna units included in the antenna array, and the interval between any adjacent two antenna units in the horizontal direction. The spacing of the antenna elements in the vertical direction. Since the third information only needs to indicate the horizontal unit distance and the vertical unit distance, and does not need to directly indicate the horizontal interval and vertical interval between any two antenna elements in the antenna array, signaling overhead can be saved.

For example, the third information may be carried in a field of the RRC signaling, such as the fifth field. The fifth field may occupy L bits, so the third information may be an L-bit sequence. Wherein, L is an integer greater than or equal to 1. It should be understood that the value of the fifth field may be used to indicate the horizontal unit distance and/or the vertical unit distance.

In some embodiments, the minimum quantization distance of the horizontal unit distance and the minimum quantization distance of the vertical unit distance may be defined in advance. For convenience of description, the minimum quantization distance of the horizontal unit distance is hereinafter referred to as the horizontal minimum quantization distance, and the minimum quantization distance of the vertical unit distance is referred to as the vertical minimum quantization distance. Of course, if the horizontal minimum quantization distance and the vertical minimum quantization distance are the same, the horizontal minimum quantization distance or the vertical minimum quantization distance may also be defined in advance, for example, 0.1λ, 0.0.1λ, and the like. It should be understood that the horizontal unit distance is an integer multiple of the horizontal minimum quantization distance, and the vertical unit distance is an integer multiple of the vertical minimum quantization distance, and the specific multiple can be indicated by the third information. For example, the horizontal minimum quantization distance and the vertical minimum quantization distance are both 0.1λ. If the value of the L bit sequences is 2, then the distance between two adjacent columns in the first matrix can be determined, that is, the horizontal unit distance is twice the horizontal minimum quantization distance, that is, 2*0.1λ. Similarly, the distance between two adjacent rows in the first matrix, that is, the vertical unit distance, is twice the vertical minimum quantization distance, that is, 2*0.1λ.

The interval between any two adjacent antenna elements included in the antenna array in the horizontal direction and the interval between any two adjacent antenna elements included in the antenna array in the vertical direction can be indirectly indicated by the third information. Exemplarily, M=4, N=2, and the value carried in the first field is "01010011". According to the first information, the terminal maps the antenna ports to the first matrix according to the rule of first row and last column, and the following matrix W1 can be obtained:

According to the first information, it may be determined that the antenna ports corresponding to the CSI-RS ports are the antenna units located in the first and third columns in the first row and the first and second columns in the second row in the first matrix. Or the antenna port corresponding to the antenna element.

Assuming that the value of the third information, that is, the L bit sequences, is 2, the terminal can determine that the horizontal distance between the antenna elements in the first column and the antenna elements in the third column in the antenna array is 2*(2*0.1λ), where, 2*0.1λ is the distance between two adjacent columns in the first matrix. The terminal may also determine that the distance between the antenna elements in the first column and the antenna elements in the second column in the antenna array is 1*(2*0.1λ), and the distance between the antenna elements in the first row and the antenna elements in the second row in the first matrix is 1*(2*0.1λ). The vertical distance is 1*(2*0.1λ).

It should be understood that if the vertical minimum quantization distance and the horizontal minimum quantization distance are different, for example, the vertical minimum quantization distance is 0.1λ, and the horizontal minimum quantization distance is 0.2λ. In this case, the third indication can be carried in two fields, such as the sixth field and the seventh field, wherein the sixth field can be used to indicate the horizontal interval between any two adjacent columns in the first matrix, and the first The seven fields are used to indicate the interval in the vertical direction of any two adjacent rows in the first matrix.

Following the above example, that is, M=4, N=2, the value carried in the first field is "01010011". According to the first information, the terminal maps the antenna ports to the first matrix according to the rule of first row and last column, and the following matrix W1 can be obtained:

Assuming that the value of the sixth field is 2 and the value of the seventh field is 3, the terminal can determine that the horizontal distance between the antenna elements in the first column and the antenna elements in the third column in the antenna array is 2*(2*0.2 λ), and the distance between the antenna ports in the first column and the antenna ports in the second column in the antenna array is 1*(2*0.2λ), and the vertical distance between the antenna elements in the first row and the antenna elements in the second row in the antenna array is 1*(2*0.2λ). The distance is 1*(3*0.1λ).

It should be noted that, if the horizontal unit distance is the horizontal minimum quantization distance, the vertical unit distance is the vertical minimum quantization distance. In this case, the base station may not send the third information to the terminal, that is, the first indication information may not include the third information. For the terminal, if the terminal does not receive the third information, it may be considered that the horizontal unit distance is the horizontal minimum quantization distance, and the vertical unit distance is the vertical minimum quantization distance.

It should be understood that the larger the dimension of the first matrix, the larger the overhead of the third information. In order to minimize the signaling overhead. In other embodiments, multiple horizontal minimum quantization distances and multiple vertical minimum quantization distances may be predefined. In this case, the horizontal minimum quantization distance that can be used by the third information is which one of a plurality of horizontal minimum quantization distances is, and the vertical minimum quantization distance to be used is which one of a plurality of vertical minimum quantization distances.

For example, the horizontal minimum quantization distance can be defined in advance including 0.01λ, 0.1λ and 1λ. The vertical minimum quantization distance is the same as the horizontal minimum quantization distance, including 0.01λ, 0.1λ, and 1λ. The third information can be carried in two fields, such as the eighth field and the ninth field, wherein the value carried in the eighth field can be used to indicate the horizontal minimum quantization distance and the vertical minimum quantization distance, and the value carried in the ninth field can be used to indicate the horizontal minimum quantization distance and the vertical minimum quantization distance. Unit distance and vertical unit distance. For example, the value carried in the eighth field is 0, indicating that the horizontal minimum quantization distance and the vertical minimum quantization distance are 0.01λ; the value carried in the eighth field is 1, indicating that the horizontal minimum quantization distance and the vertical minimum quantization distance are 0.1λ; the eighth field The value carried is 2, representing the horizontal minimum quantization distance and the vertical minimum quantization distance of 1λ. It should be understood that the values of the eighth field above are only examples. This embodiment of the present application does not limit the number of bits occupied by the eighth field. For ease of description, the following takes the eighth field occupying P bits as an example, where P is greater than or equal to 1. The ninth field occupies L bit sequences. If the value of the L bit sequences is 2, the distance between two adjacent columns in the first matrix can be determined, that is, the horizontal unit distance is twice the horizontal minimum quantization distance. Similarly, the distance between two adjacent rows in the first matrix, that is, the vertical unit distance, is twice the vertical minimum quantization distance.

It should be understood that, as above, the horizontal minimum quantization distance and the vertical minimum quantization distance are the same as an example. In some embodiments, the horizontal minimum quantization distance and the vertical minimum quantization distance may not be the same. In this case, the third information may also be carried in two fields, such as the aforementioned eighth field and ninth field. The value of some bits in the eighth field may be used to indicate the horizontal minimum quantization distance, and the value of another part of the bits in the eighth field may be used to indicate the vertical minimum quantization distance.

Alternatively, the horizontal minimum quantization distance and the vertical minimum quantization distance are the same, but the horizontal unit distance and the vertical unit distance may be different. In this case, the third information may also be carried in the eighth field and the ninth field. The value of the eighth field may be used to indicate the horizontal minimum quantization distance and the vertical minimum quantization distance. Part of the bits of the ninth field may be used to indicate the horizontal unit distance, and another part of the bits of the ninth field may be used to indicate the vertical unit distance.

Alternatively, the horizontal minimum quantization distance and the vertical minimum quantization distance are different, and the horizontal unit distance and the vertical unit distance are also different. In this case, the third information may also be carried in the eighth field and the ninth field. The value of some bits in the eighth field may be used to indicate the horizontal minimum quantization distance, and the value of another part of the bits in the eighth field may be used to indicate the vertical minimum quantization distance. Part of the bits of the ninth field may be used to indicate the horizontal unit distance, and another part of the bits of the ninth field may be used to indicate the vertical unit distance.

In this embodiment of the present application, multiple horizontal minimum quantization distances and multiple vertical minimum quantization distances can be defined. In this way, the dimension of the first matrix can be flexibly set to reduce signaling overhead. Moreover, the interval between the antenna elements in the antenna array is indicated more precisely, for example, the interval can be accurate to 2 or more digits after the decimal point.

The base station can indicate the correspondence between the antenna port and the CS-RS port for the terminal through the first indication information, and for various hybrid antenna arrays, the base station can indicate the correspondence between the antenna port and the CS-RS port for the terminal. After receiving the first indication information, the terminal may map the antenna ports to the first matrix according to the first indication information, so as to determine the antenna ports corresponding to the CSI-RS ports. The terminal measures the pilot signal received from the determined antenna port, calculates the final CSI, and sends the CSI to the base station. Since the terminal can determine the correspondence between the antenna port and the CSI-RS port according to the first indication information, and the first indication information is determined by the base station for the used antenna array, such as a dual-polarized antenna array or a hybrid antenna array, it can be Guarantee better system performance. Alternatively, a second codebook different from the first codebook can be designed for the hybrid antenna array, and the first indication information can also be considered to be determined by the base station for the first codebook or the second codebook, so as to ensure better system performance as much as possible .

The solutions provided by the embodiments of the present application, such as the aforementioned various implementation solutions of the first indication information, can indicate the correspondence between the antenna port and the CSI-RS port for the terminal. Since the first indication information may be a dual-polarized antenna array equivalent to an antenna array used by mapping the antenna ports to the base station, it is compatible with various types of antenna arrays and has a wider application range. And the first indication information corresponds to the antenna array used by the base station, or the first indication information corresponds to the codebook corresponding to the antenna array, so better system performance can be guaranteed.

In the above embodiments provided in the present application, the methods provided in the embodiments of the present application are respectively introduced from the perspective of interaction between a terminal and a network device. In order to implement the functions in the methods provided by the above embodiments of the present application, the terminal and the network device may include hardware structures and/or software modules, and implement the above functions in the form of hardware structures, software modules, or hardware structures plus software modules. Whether one of the above functions is performed 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.

The following describes a communication device used to implement the above method in the embodiments of the present application with reference to the accompanying drawings. Therefore, the above content can be used in subsequent embodiments, and repeated content will not be repeated.

FIG. 18 is a schematic block diagram of a communication apparatus 1800 according to an embodiment of the present application. The communication apparatus 1800 may correspondingly implement the functions or steps implemented by the terminal or the network device in each of the foregoing method embodiments. The communication device may include a processing module 1810 and a transceiver module 1820 . Optionally, a storage unit may also be included, and the storage unit may be used to store instructions (codes or programs) and/or data. The processing module 1810 and the transceiver module 1820 may be coupled with the storage unit, for example, the processing unit 1810 may read instructions (codes or programs) and/or data in the storage unit to implement corresponding methods. The above-mentioned units may be set independently, or may be partially or fully integrated.

In some possible implementation manners, the communication apparatus 1800 can correspondingly implement the behaviors and functions of the terminal in the foregoing method embodiments. For example, the communication apparatus 1800 may be a terminal, and may also be a component (eg, a chip or a circuit) applied in the terminal. The transceiver module 1820 may be used to perform all receiving or sending operations performed by the terminal in the embodiment shown in FIG. 13 , such as S1301 in the embodiment shown in FIG. 13 , and/or for supporting the technology described herein. other processes. Wherein, the processing module 1810 is configured to perform all operations performed by the terminal in the embodiment shown in FIG. 13 except for the transceiving operation, such as S1302 in the embodiment shown in FIG. 13 , and/or to support this document other procedures of the described techniques.

In some embodiments, the transceiver module 1820 is configured to receive the first indication information from the network device, and send the CSI determined by the processing module 1810 according to the first indication information to the network device, where the first indication information is used to indicate the antenna port Correspondence with CSI-RS ports.

As an optional implementation manner, the antenna port corresponds to a radio frequency channel of an antenna array, where the antenna array satisfies one or more of the following conditions:

As an optional implementation manner, the first indication information includes first information, where the first information is used to indicate the antenna port corresponding to the CSI-RS port in the first matrix, and the first matrix is used to determine the antenna port corresponding to the CSI-RS port. Antenna port corresponding to CSI-RS port.

As an optional implementation manner, the first indication information further includes second information, where the second information is used to indicate the vertical dimension and the horizontal dimension of the first matrix.

As an optional implementation manner, the first indication information further includes third information, where the third information is used to indicate a horizontal interval between any two adjacent antenna elements included in the antenna array, and any phase The vertical spacing of two adjacent antenna elements.

It should be understood that the processing module 1810 in this embodiment of the present application may be implemented by a processor or a processor-related circuit component, and the transceiver module 1820 may be implemented by a transceiver or a transceiver-related circuit component or a communication interface.

In some possible implementation manners, the communication apparatus 1800 can correspondingly implement the behaviors and functions of the network devices in the foregoing method embodiments. For example, the communication apparatus 1800 may be a network device, or may be a component (eg, a chip or a circuit) applied in the network device. The transceiver module 1820 may be used to perform all receiving or sending operations performed by the network device in the embodiment shown in FIG. 13 , such as S1301 in the embodiment shown in FIG. 13 , and/or to support the techniques described herein other processes. Wherein, the processing module 1810 is configured to perform all operations performed by the network device in the embodiment shown in FIG. 13 except for the transceiving operation, such as S1303 in the embodiment shown in FIG. 13 , and/or for supporting Other procedures for the techniques described herein.

In some embodiments, the transceiver module 1820 is configured to send the first indication information determined by the processing module 1810 to the terminal, and receive CSI from the terminal, where the first indication information is used to indicate the antenna port and the CSI-RS The corresponding relationship of the ports, the CSI is determined according to the first indication information.

As an optional implementation manner, the antenna ports correspond to radio frequency channels of an antenna array, and the antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, wherein all The antenna array satisfies one or more of the following conditions:

As an optional implementation manner, the processing module 1810 is further configured to equalize the four-port antenna unit into two two-port antennas, and determine the first indication information according to the two-port antennas obtained after the equivalence, wherein,

Exemplarily, there are many ways for the processing module 1810 to convert the four-port antenna unit into two two-port antenna units, including but not limited to the following equivalent ways:

FIG. 19 shows a communication apparatus 1900 provided in this embodiment of the present application, where the communication apparatus 1900 may be a terminal capable of implementing the functions of the terminal in the method provided in this embodiment of the present application, or the communication apparatus 1900 may be a network device capable of Implement the function of the network device in the method provided by the embodiment of the present application; the communication apparatus 1900 may also be a device that can support the terminal to implement the corresponding function in the method provided by the embodiment of the present application, or can support the network device to implement the function provided by the embodiment of the present application. The means of the corresponding function in the method. Wherein, the communication device 1900 may be a chip or a chip system. In this embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

In terms of hardware implementation, the above-mentioned transceiver module 1820 may be a transceiver, and the transceiver is integrated into the communication device 1900 to form a communication interface 1910 .

The communication apparatus 1900 includes at least one processor 1920, which is configured to implement or support the communication apparatus 1900 to implement the function of the network device or terminal in the method provided in the embodiments of this application. For details, refer to the detailed description in the method example, which is not repeated here.

Communication apparatus 1900 may also include at least one memory 1930 for storing program instructions and/or data. Memory 1930 and processor 1920 are coupled. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. Processor 1920 may cooperate with memory 1930. The processor 1920 may execute program instructions and/or data stored in the memory 1930 to cause the communication device 1900 to implement the corresponding method. At least one of the at least one memory may be included in the processor.

The communication apparatus 1900 may also include a communication interface 1910 for communicating with other devices through a transmission medium, so that the devices used in the communication apparatus 1900 may communicate with other devices. Exemplarily, when the communication device is a terminal, the other device is a network device; or, when the communication device is a network device, the other device is a terminal. The processor 1920 may use the communication interface 1910 to send and receive data. The communication interface 1910 may specifically be a transceiver.

The specific connection medium between the communication interface 1910 , the processor 1920 , and the memory 1930 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1930, the processor 1920, and the communication interface 1910 are connected through a bus 1940 in FIG. 19. The bus is represented by a thick line in FIG. 19, and the connection between other components is only for schematic illustration. , is not limited. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is shown in FIG. 19, but it does not mean that there is only one bus or one type of bus.

In this embodiment of the present application, the processor 1920 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement Alternatively, each method, step, and logic block diagram disclosed in the embodiments of the present application are executed. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

In this embodiment of the present application, the memory 1930 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (volatile memory), Such as random-access memory (random-access memory, RAM). Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory in this embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and/or data.

It should be noted that, the communication device in the above embodiment may be a terminal or a circuit, and may also be a chip applied in the terminal or other combined devices and components having the above terminal function. When the communication device is a terminal, the transceiver module may be a transceiver, which may include an antenna and a radio frequency circuit, etc., and the processing module may be a processor, such as a central processing unit (CPU). When the communication device is a component with the above terminal function, the transceiver module may be a radio frequency unit, and the processing module may be a processor. When the communication device is a chip or a chip system, the transceiver module may be an input/output interface of the chip or the chip system, and the processing module may be a processor of the chip or the chip system.

FIG. 20 shows a schematic structural diagram of a simplified communication device. For the convenience of understanding and illustration, in FIG. 20 , the communication device is a base station as an example. The base station may be applied to the system shown in FIG. 1 , and may be the network device in FIG. 1 , and execute the functions of the network device in the foregoing method embodiments.

The communication device 2000 may include a transceiver 2001 , a memory 2021 and a processor 2022 . The transceiver 2001 can be used for communication by a communication device, such as for sending or receiving the above-mentioned indication information. The memory 2021 is coupled to the processor 2022, and can be used to store programs and data necessary for the communication device 2000 to implement various functions. The processor 2022 is configured to support the communication device 2000 to perform the corresponding functions in the above-mentioned methods, and the functions can be implemented by calling programs stored in the memory 2021 .

Specifically, the transceiver 2010 may be a wireless transceiver, which may be used to support the communication apparatus 2000 to receive and send signaling and/or data through a wireless air interface. The transceiver 2010 may also be referred to as a transceiver unit or a communication unit, and the transceiver 2010 may include one or more radio frequency units 2012 and one or more antennas 2011, wherein the radio frequency unit is such as a remote radio unit (remote radio unit, RRU) Or an active antenna unit (active antenna unit, AAU), which can be specifically used for the transmission of radio frequency signals and the conversion of radio frequency signals and baseband signals, and the one or more antennas can specifically be used for radiation and reception of radio frequency signals. Optionally, the transceiver 2010 may only include the above radio frequency unit 2012, and then the communication apparatus 2000 may include the transceiver 2010, a memory 2021, a processor 2022, and an antenna.

The memory 2021 and the processor 2022 can be integrated or independent from each other. As shown in FIG. 20 , the memory 2021 and the processor 2022 can be integrated into the control unit 2020 of the communication device 2000 . Exemplarily, the control unit 2020 may include a baseband unit (BBU) of an LTE base station, and the baseband unit may also be referred to as a digital unit (DU), or the control unit 2020 may include 5G and future wireless access A distributed unit (DU) and/or a centralized unit (CU) in a base station under the technology. The above control unit 2020 may be composed of one or more antenna panels, wherein, multiple antenna panels can jointly support a wireless access network (such as an LTE network) of a single access standard, and multiple antenna panels can also support different access standards. Radio access network (such as LTE network, 5G network or other network). The memory 2021 and processor 2022 may serve one or more antenna panels. That is, the memory 2021 and the processor 2022 may be separately provided on each antenna panel. It is also possible that multiple antenna panels share the same memory 2021 and processor 2022 . In addition, necessary circuits may be provided on each antenna panel, for example, the circuits may be used to realize the coupling between the memory 2021 and the processor 2022 . The above transceiver 2010, processor 2022 and memory 2021 can be connected through a bus structure and/or other connection media.

Based on the structure shown in FIG. 20 , when the communication device 2000 needs to send data, the processor 2022 can perform baseband processing on the data to be sent, and then output the baseband signal to the radio frequency unit, and the radio frequency unit performs radio frequency processing on the baseband signal and sends the radio frequency signal through the antenna. It is sent in the form of electromagnetic waves. When data is sent to the communication device 2000, the radio frequency unit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 2022. The processor 2022 converts the baseband signal into data and sends the data to the data. to be processed.

Based on the structure shown in FIG. 20 , the transceiver 2010 can be used to perform the above steps performed by the transceiver module 1820 . And/or, the processor 2022 may be used to invoke instructions in the memory 2021 to perform the steps performed by the processing module 1810 above.

FIG. 21 shows a schematic structural diagram of a simplified terminal. For the convenience of understanding and illustration, in FIG. 21 , the terminal takes a mobile phone as an example. As shown in Figure 21, the terminal includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device. The processor is mainly used to process communication protocols and communication data, control the vehicle-mounted unit, execute software programs, and process data of software programs. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal. Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of equipment may not have input and output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal through the antenna in the form of electromagnetic waves. When data is sent to the device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 21 . In an actual device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device or the like. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in this embodiment of the present application.

In the embodiments of the present application, the antenna and the radio frequency circuit with a transceiver function may be regarded as the transceiver unit of the apparatus, and the processor with the processing function may be regarded as the processing unit of the apparatus. As shown in FIG. 21 , the device includes a transceiver unit 2110 and a processing unit 2120 . The transceiver unit 2110 may also be referred to as a transceiver, a transceiver, a transceiver, or the like. The processing unit 2120 may also be referred to as a processor, a processing board, a processing module, a processing device, and the like. Optionally, the device for implementing the receiving function in the transceiver unit 2110 may be regarded as a receiving unit, and the device for implementing the sending function in the transceiver unit 2110 may be regarded as a transmitting unit, that is, the transceiver unit 2110 includes a receiving unit and a transmitting unit. The transceiver unit 2110 may also be sometimes referred to as a transceiver, a transceiver, or a transceiver circuit or the like. The receiving unit may also sometimes be referred to as a receiver, receiver, or receiving circuit, or the like. The transmitting unit may also sometimes be referred to as a transmitter, a transmitter, or a transmitting circuit, or the like.

It should be understood that the transceiver unit 2110 is configured to perform the sending and receiving operations on the terminal side in the foregoing method embodiments, and the processing unit 2120 is configured to perform other operations on the terminal except for the sending and receiving operations in the foregoing method embodiments.

For example, in one implementation, the transceiver unit 2110 may be used to perform S1301 in the embodiment shown in FIG. 13 , and/or to support other processes of the techniques described herein.

When the communication device is a chip-type device or circuit, the device may include a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit and/or a communication interface; the processing unit may be an integrated processor, a microprocessor or an integrated circuit.

In this embodiment, reference may be made to the device shown in FIG. 22 . As an example, the apparatus may perform functions similar to the processing module 1810 in FIG. 18 . In FIG. 22, the apparatus includes a processor 2210, a transmit data processor 2220, and a receive data processor 2130. The processing module 1810 in the above-mentioned embodiment may be the processor 2210 in FIG. 22, and performs corresponding functions. The processing module 1810 in the above embodiment may be the sending data processor 2220 and/or the receiving data processor 2230 in FIG. 22 . Although the channel encoder and the channel decoder are shown in FIG. 22, it can be understood that these modules do not constitute a limitative description of this embodiment, but are only illustrative.

FIG. 23 shows another form of this embodiment. The communication device 2300 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem. The communication apparatus in this embodiment may serve as a modulation subsystem therein. Specifically, the modulation subsystem may include a processor 2303 and an interface 2304 . The processor 2303 completes the functions of the above-mentioned processing module 1810 , and the interface 2304 implements the functions of the above-mentioned transceiver module 1820 . As another variant, the modulation subsystem includes a memory 2306, a processor 2303, and a program stored in the memory 2306 and executable on the processor. When the processor 2303 executes the program, the method of the terminal in the above method embodiment is implemented . It should be noted that the memory 2306 can be non-volatile or volatile, and its location can be located inside the modulation subsystem or in the communication device 2300, as long as the memory 2306 can be connected to the The processor 2303 is sufficient.

The embodiment of the present application further provides a communication system, specifically, the communication system includes a network device and a terminal, or may further include more network devices and multiple terminals. Exemplarily, the communication system includes a network device and a terminal for implementing the above-mentioned related functions of FIG. 13 .

The network devices are respectively used to implement the functions of the above-mentioned network parts related to FIG. 13 . The terminal is used to implement the functions of the above-mentioned terminal related to FIG. 13 . For details, please refer to the relevant descriptions in the foregoing method embodiments, which will not be repeated here.

Embodiments of the present application also provide a computer-readable storage medium, including instructions, which, when running on a computer, cause the computer to execute the method executed by the network device in FIG. 13 ; or when running on the computer, cause the computer to execute the method The method performed by the terminal in FIG. 13 .

The embodiments of the present application also provide a computer program product, including instructions, which, when running on a computer, cause the computer to execute the method executed by the network device in FIG. 13 ; or when running on the computer, cause the computer to execute the method shown in FIG. 13 . The method executed in the terminal.

The embodiments of the present application provide a chip system, which includes a processor and may also include a memory, for implementing the functions of the network device or terminal in the foregoing method; or for implementing the functions of the network device and the terminal in the foregoing method. The chip system can be composed of chips, and can also include chips and other discrete devices.

It should be understood that the terms "system" and "network" in the embodiments of the present application may be used interchangeably. "At least one" means one or more, and "plurality" means two or more. "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b or c, can represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.

And, unless stated to the contrary, the ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, sequence, priority or priority of multiple objects. Importance. For example, the first relaxation measurement strategy and the second relaxation measurement strategy are only for differentiating different measurements, but do not indicate the difference in priority or importance of the two strategies.

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.

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

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

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

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

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A method for feeding back channel state information CSI, comprising:

receiving first indication information from a network device, where the first indication information is used to indicate a correspondence between an antenna port and a channel state information reference signal CSI-RS port;

Send CSI to the network device according to the first indication information.
The method of claim 1, wherein the antenna port corresponds to a radio frequency channel of an antenna array, wherein the antenna array satisfies one or more of the following conditions:

The antenna array includes at least one first antenna unit and at least one second antenna unit, and the number of ports of the first antenna unit and the second antenna unit are different;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the interval between two antenna elements in the at least one row of antenna elements is different or partially the same;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the spacing between two antenna elements in the at least one row of antenna elements is different or partially the same.
The method according to claim 1 or 2, wherein the first indication information comprises first information, and the first information is used to indicate an antenna port corresponding to the CSI-RS port in the first matrix, Wherein, the first matrix is used to determine the antenna port corresponding to the CSI-RS port.
The method of claim 3, wherein the first indication information further comprises second information, wherein the second information is used to indicate a vertical dimension and a horizontal dimension of the first matrix.
The method according to claim 3 or 4, wherein the first indication information further includes third information, and the third information is used to indicate that any two adjacent antenna elements included in the antenna array are in The spacing in the horizontal direction, and the spacing in the vertical direction of any two adjacent antenna elements.
A feedback method for channel state information, comprising:

sending first indication information to the terminal, where the first indication information is used to indicate the correspondence between the antenna port and the channel state information reference signal CSI-RS port;

Receive channel state information CSI from the terminal, where the CSI is determined according to the first indication information.
The method of claim 6, wherein the antenna port corresponds to a radio frequency channel of an antenna array, wherein the antenna array satisfies one or more of the following conditions:

The antenna array includes at least one first antenna unit and at least one second antenna unit, and the number of ports of the first antenna unit and the second antenna unit are different;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the interval between two antenna elements in the at least one row of antenna elements is different or partially the same;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the spacing between two antenna elements in the at least one row of antenna elements is different or partially the same.
The method according to claim 6 or 7, wherein the first indication information comprises first information, and the first information is used to indicate the antenna port corresponding to the CSI-RS port in the first matrix, Wherein, the first matrix is used to determine the antenna port corresponding to the CSI-RS port.
The method of claim 8, wherein the first indication information further comprises second information, wherein the second information is used to indicate a vertical dimension and a horizontal dimension of the first matrix.
The method according to claim 8 or 9, wherein the first indication information further includes third information, and the third information is used to indicate that any two adjacent antenna elements included in the antenna array are in The spacing in the horizontal direction, and the spacing in the vertical direction of any two adjacent antenna elements.
A communication device is characterized by comprising a processing module and a transceiver module, wherein,

The transceiver module is configured to receive first indication information from a network device, where the first indication information is used to indicate a correspondence between an antenna port and a channel state information reference signal CSI-RS port;

The transceiver module is further configured to send the channel state information CSI determined by the processing module according to the first indication information to the network device.
The communication device according to claim 11, wherein the antenna port corresponds to a radio frequency channel of an antenna array, wherein the antenna array satisfies one or more of the following conditions:

The antenna array includes at least one first antenna unit and at least one second antenna unit, and the number of ports of the first antenna unit and the second antenna unit are different;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the interval between two antenna elements in the at least one row of antenna elements is different or partially the same;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the spacing between two antenna elements in the at least one row of antenna elements is different or partially the same.
The communication apparatus according to claim 11 or 12, wherein the first indication information comprises first information, and the first information is used to indicate an antenna port corresponding to the CSI-RS port in the first matrix , wherein the first matrix is used to determine the antenna port corresponding to the CSI-RS port.
The communication device according to claim 13, wherein the first indication information further comprises second information, the second information being used to indicate the vertical dimension and the horizontal dimension of the first matrix.
The communication device according to claim 13 or 14, wherein the first indication information further includes third information, and the third information is used to indicate any two adjacent antenna units included in the antenna array The spacing in the horizontal direction, and the spacing between any two adjacent antenna elements in the vertical direction.
The communication device according to any one of claims 11-15, wherein the processing module is a processor, and the transceiver module is a transceiver.
The communication device according to any one of claims 11-16, wherein the communication device is a terminal device, a chip or a chip system.
A communication device is characterized by comprising a processing module and a transceiver module, wherein,

The transceiver module is configured to send the first indication information generated by the processing module to the terminal, where the first indication information is used to indicate the correspondence between the antenna port and the channel state information reference signal CSI-RS port;

The transceiver module is further configured to receive channel state information CSI from the terminal, where the CSI is determined according to the first indication information.
The communication device according to claim 18, wherein the antenna port corresponds to a radio frequency channel of an antenna array, wherein the antenna array satisfies one or more of the following conditions:

The antenna array includes at least one first antenna unit and at least one second antenna unit, and the number of ports of the first antenna unit and the second antenna unit are different;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the interval between two antenna elements in the at least one row of antenna elements is different or partially the same;

The antenna array includes at least one row of antenna elements arranged in a horizontal direction and at least one column of antenna elements arranged in a vertical direction, and the spacing between two antenna elements in the at least one row of antenna elements is different or partially the same.
The communication apparatus according to claim 18 or 19, wherein the first indication information comprises first information, and the first information is used to indicate an antenna port corresponding to the CSI-RS port in the first matrix , wherein the first matrix is used to determine the antenna port corresponding to the CSI-RS port.
The communication device according to claim 20, wherein the first indication information further comprises second information, the second information is used to indicate the vertical dimension and the horizontal dimension of the first matrix.
The communication device according to claim 20 or 21, wherein the first indication information further includes third information, and the third information is used to indicate any two adjacent antenna units included in the antenna array The spacing in the horizontal direction, and the spacing between any two adjacent antenna elements in the vertical direction.
The communication device according to any one of claims 18-22, wherein the processing module is a processor, and the transceiver module is a transceiver.
The communication device according to any one of claims 18-23, wherein the communication device is a network device, a chip or a chip system.
A communication device, characterized in that the communication device comprises a processor and a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the device executes the The method of any one of claims 1-5 or 6-10.
A communication device, characterized in that the communication device comprises a processor and a communication interface, the communication interface is used for inputting and/or outputting information, and the processor is used for executing a computer program, so that the device executes the method as claimed in the claims The method of any one of 1-5 or 6-10.
A communication system, characterized in that the communication system comprises the communication device according to one of claims 11-17 and the communication device according to one of claims 18-24.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when executed by a computer, the computer program causes the computer to execute the method as claimed in claims 1 to 5 or 6 to 10. any of the methods described.
A computer program product, characterized in that the computer program product stores a computer program, and when executed by a computer, the computer program causes the computer to execute any one of claims 1 to 5 or 6 to 10. method described.