Channel information feedback method and apparatus, and storage medium and program product

Abstract

Provided in the present disclosure are a channel information feedback method and apparatus, and a storage medium and a program product. The method comprises: determining X channel state information reference signal (CSI-RS) resource groups, wherein X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups comprises one or more CSI-RS resources; and sending related information of the X CSI-RS resource groups to a second node.

Description

Channel information feedback methods, devices, storage media and program products

[0001] This application claims priority to Chinese patent application No. 202411620687.9, filed on November 12, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of communication technology, and in particular to a channel information feedback method, apparatus, storage medium, and program product. Background Technology

[0003] In wireless communication, the channel environment between the receiver and transmitter is complex and variable. For example, factors such as signal propagation direction, terrain, and weather conditions can all alter the signal propagation path, resulting in channel multipath effects.

[0004] When a signal reaches the receiver through different paths, interference will occur between the signals on each path. At this time, even a slight movement of the terminal position may cause a large change in the channel characteristics, resulting in a sudden and significant drop in signal quality, i.e., spatial deep attenuation. This will seriously affect the signal reception performance and lead to a poor communication experience for the user. Summary of the Invention

[0005] This disclosure provides a channel information feedback method, apparatus, storage medium, and program product through some embodiments, which can solve the communication problems caused by deep attenuation in related technologies.

[0006] On the one hand, a channel information feedback method is provided. This method includes: determining X Channel State Information Reference Signal (CSI-RS) resource groups. X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources. The relevant information of the X CSI-RS resource groups is then sent to a second node.

[0007] On the other hand, another channel information feedback method is provided. This method includes: receiving relevant information from X CSI-RS resource groups from a first node; X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0008] On the other hand, a first node is provided. This first node includes a processing unit and a communication unit. The processing unit is used to determine X CSI-RS resource groups. X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources. The communication unit is used to send relevant information about the X CSI-RS resource groups to a second node.

[0009] On the other hand, a second node is provided. This second node includes a communication unit. The communication unit is used to receive information related to X CSI-RS resource groups from the first node. X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0010] In another aspect, a communication device is provided. This communication device includes a memory and a processor. The memory and the processor are coupled. The memory stores instructions executable by the processor; when the processor executes the instructions, it implements the methods described above.

[0011] In another aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores computer program instructions that, when executed on a computer, implement the above-described method.

[0012] In another aspect, a computer program product is provided. This computer program product includes computer program instructions that, when executed by a processor, implement the above-described method.

[0013] In this disclosure, the first node can determine X CSI-RS resource groups and send relevant information about these X CSI-RS resource groups to the second node. X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources. In actual wireless communication scenarios, the channel environment between the transmitter and receiver is often complex, especially in scenarios with abundant multipath propagation. For example, when multiple nodes serve a single terminal, even a slight movement of the terminal's location can prevent the signals from being positively superimposed, resulting in deep spatial attenuation. This disclosure allows the first node to select or determine CSI-RS resource groups and then feed back relevant information about the determined CSI-RS resource groups to the second node. This enables the second node to manage spatial resources based on the information fed back by the first node, thereby reducing or avoiding the problem of multiple signals not being positively superimposed during transmission, ensuring signal reception performance, and improving the user's communication experience. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly introduced below. However, the accompanying drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings.

[0015] Figure 1 is a distribution diagram of a channel state according to some embodiments;

[0016] Figure 2 is an architecture diagram of a communication system according to some embodiments;

[0017] Figure 3 is a flowchart of a channel information feedback method according to some embodiments;

[0018] Figure 4 is a structural diagram of a temporal resource group according to some embodiments;

[0019] Figure 5 is a scenario diagram of transmit beam training for multiple access points (APs) according to some embodiments;

[0020] Figure 6 is a distribution diagram of another channel state according to some embodiments;

[0021] Figure 7 is a scenario diagram of wireless communication according to some embodiments;

[0022] Figure 8 is a flowchart of another channel information feedback method according to some embodiments;

[0023] Figure 9 is a structural diagram of a first node according to some embodiments;

[0024] Figure 10 is a structural diagram of a second node according to some embodiments;

[0025] Figure 11 is a structural diagram of a communication device according to some embodiments. Detailed Implementation

[0026] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. However, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0027] It should be noted that in this disclosure, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts by way of example.

[0028] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] In the description of this disclosure, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" means one or more, and "more than one" means two or more.

[0030] In wireless communication, the channel environment between the receiver and transmitter is complex and variable. For example, factors such as signal propagation direction, terrain, and weather conditions can all alter the signal propagation path, resulting in channel multipath effects.

[0031] When signals arrive at the receiver via different paths, interference can occur between the signals. Even a slight movement of the terminal's location can cause significant changes in channel characteristics, leading to a sudden and substantial deterioration in signal quality. This problem is particularly pronounced when multiple access points are transmitting the same data layer data to the terminal.

[0032] For example, the access network sends signals to the terminal through two access points (APs), each AP consisting of eight antennas. If each of these two APs uses a spatial precoding, the correlation values ​​between a fixed combination of precoding for these two APs and the actual channel at different locations are shown in Figure 1.

[0033] Figure 1 illustrates the correlation between the precoding obtained at the terminal's location (x0, y0, z0) and the channels at different locations (x, y, z). The shaded areas represent locations where the difference between the precoding and the actual channel is too large, resulting in a very small correlation value. The lighter-colored areas in Figure 1 indicate locations where the correlation between the precoding and the actual channel is relatively large. When z takes the same value, each location point lies in a plane perpendicular to the z-axis, and the antenna lies in the plane where z = 0. The horizontal and vertical axes in Figure 1 are x and y, respectively, and the corresponding units are wavelengths λ (Lamda). Obviously, if the base station uses the precoding at the feedback time as the precoding for the signal transmission, and the terminal's position is slightly adjusted between the precoding feedback time and the signal transmission time, it will lead to inconsistencies between the actual channel state of the terminal and the precoding. For example, if a user obtains precoding measurement results at the light-colored location in Figure 1 and sends them back to the base station, the terminal may have already moved to a dark-colored location adjacent to the light-colored location when the base station transmits the data signal. However, the base station may still use the fixed precoding from the terminal at the light-colored location. For wavelength-granular positional shifts, the correlation between the terminal's actual channel and the precoding will change significantly, rendering the precoding unusable. Spatial deep decay indicates that as the user terminal moves, the correlation between the fixed precoding and the channel alternates between large and small values; this can also be called temporal deep decay.

[0034] The correlation between fixed precoding and the channel can be viewed as a location-dependent function, and even a small change in location can cause significant fluctuations in the correlation, indicating a spatial deep fading phenomenon in distributed transmission. This phenomenon severely impacts signal reception performance, resulting in a poor communication experience for users.

[0035] Therefore, the first node can identify X Channel State Information Reference Signal (CSI-RS) resource groups and send the relevant information of these X CSI-RS resource groups to the second node. X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0036] In real-world wireless communication scenarios, the channel environment between the transmitter and receiver is often complex, especially in multipath-rich environments. For example, when multiple nodes serve a single terminal, even a slight movement of the terminal's location can prevent the signals from overlapping, leading to deep spatial attenuation. This disclosure addresses this issue by having a first node select or determine CSI-RS resource groups and then feed back the relevant information of these CSI-RS resource groups to a second node. This allows the second node to manage spatial resources based on the information from the first node for X CSI-RS resource groups, thereby reducing or avoiding the problem of multiple signals not overlapping during transmission, ensuring signal reception performance, and improving the user's communication experience.

[0037] In some embodiments of this disclosure, the mobile communication network includes, but is not limited to, Wireless Fidelity (WiFi), 3rd Generation Mobile Communication Technology (3G), 4th Generation Mobile Communication Technology (4G), 5th Generation Mobile Communication Technology (6G), and future mobile communication networks. The network architecture of the mobile communication network may include at least a first communication node and a second communication node.

[0038] It should be understood that, in some embodiments of this disclosure, in the downlink, the first communication node can be a network-side device (e.g., including but not limited to a base station), and the second communication node can be a terminal-side device (e.g., including but not limited to a terminal). Of course, in the uplink, the first communication node can also be a terminal-side device, and the second communication node can also be a network-side device. In device-to-device communication between the two communication nodes, both the first and second communication nodes can be a base station or a terminal. The first and second communication nodes can be referred to as the first node and the second node, respectively.

[0039] For example, taking a first communication node as a terminal and a second communication node as a base station as an example, as shown in Figure 2, Figure 2 is a communication system according to some embodiments, which includes a base station 201 and a terminal 202. There can be one or more base stations 201 and terminals 202, and this disclosure does not limit the number of base stations 201 and terminals 202.

[0040] Base station 201 is a device located on the access network side of the aforementioned communication system and possessing wireless transceiver capabilities, or a chip or chip system that can be installed on such device. Base station 201 includes, but is not limited to: access points (APs) in WiFi systems, such as home gateways, routers, servers, switches, bridges, evolved NodeBs (eNBs), radio network controllers (RNCs), NodeBs (NBs), base station controllers (BSCs), base transceiver stations (BTSs), home base stations (e.g., home evolved NodeBs or home NodeBs (HNBs), base band units (BBUs), wireless relay nodes, wireless backhaul nodes, and transmission and reception points (TRPs or Transmission Points, TPs). Base station 201 can also be a 5G base station, such as a gNB in ​​a New Radio (NR) system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or transmission point, such as a baseband unit (BBU), or a distributed unit (DU), a roadside unit (RSU) with base station functionality, or 5G radio access network (NG-Ran) equipment, etc. Base station 201 also includes base stations in different networking modes, such as a master evolved NodeB (MeNB) and a secondary base station (Secondary eNB, SeNB, or Secondary gNB, SgNB). Base station 201 also includes different types of base stations, such as terrestrial base stations, airborne base stations, and satellite base stations.

[0041] Terminal 202 is a device with wireless communication capabilities that can be deployed on land (e.g., indoors or outdoors, handheld or vehicle-mounted), on water (e.g., on ships), or in the air (e.g., on airplanes, balloons, and satellites). Terminal 202, also known as User Equipment (UE), Mobile Station (MS), Mobile Terminal (MT), or terminal equipment, is a device that provides voice and / or data connectivity to a user. For example, terminal 202 includes handheld devices and vehicle-mounted devices with wireless connectivity. Currently, terminal 202 can be: mobile phone, tablet computer, laptop computer, PDA, mobile internet device (MID), wearable device (e.g., smartwatch, smart bracelet, pedometer), in-vehicle device (e.g., car, bicycle, electric vehicle, airplane, ship, train, high-speed rail), virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, smart home device (e.g., refrigerator, television, air conditioner, electricity meter), smart robot, workshop equipment, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, or wireless terminal in smart home, or flying device (e.g., smart robot, hot air balloon, drone, airplane). In one possible application scenario of this disclosure, the terminal is a terminal that frequently operates on the ground, such as an in-vehicle device. In this disclosure, for ease of description, the chip deployed in the above-mentioned device, such as a system-on-a-chip (SOC), a baseband chip, or other chip with communication functions, may also be referred to as a terminal.

[0042] The technical solution provided in this disclosure can be applied to channel information feedback scenarios of one or more access points (APs), which can be base station 201 in the aforementioned communication system. The one or more APs can also be connected to base station 201 in the aforementioned communication system via a communication link. Base station 201 is used for configuration management, user authentication, network access control, etc., of the connected APs. For example, base station 201 can be an access controller (AC). The one or more APs can also be antenna units in base station 201 in the aforementioned communication system. For example, base station 201 can be a multilink device (MLD) in a WiFi system, where multiple APs exist and can establish multiple channels with terminal 202 (also called a station (STA)).

[0043] In some embodiments, terminal 202 may provide channel feedback to base station 201. Base station 201 performs scheduling based on the channel feedback from terminal 202 and sends signals to terminal 202 through one or more access points.

[0044] Due to the complex channel environment between terminal 202 and the access point (AP), electromagnetic wave signals transmitted by one or more APs on multiple channels may interfere with each other, and the phase superposition effect of electromagnetic wave signals varies at different locations. At some locations, the electromagnetic waves superimpose in the forward direction, while at others, they superimpose in the reverse direction. Therefore, terminal 202 can reduce or avoid signal interference on different channels by providing channel feedback to base station 201, thereby improving the actual communication quality.

[0045] It should be noted that the various embodiments of this disclosure can be referenced or learned from each other. For example, the same or similar steps, method embodiments, system embodiments and device embodiments can be referenced from each other without limitation.

[0046] The following description, using the communication system shown in Figure 2 as an example and taking the interaction between the first node and the second node as an example, illustrates some embodiments of the communication method provided in this disclosure. It should be noted that the first node and the second node can be devices in the aforementioned communication system, modules within devices, or protocol layers within the communication system. This disclosure uses the first node and the second node as examples of the execution entities in this interaction illustration, but this disclosure does not limit the execution entities of the interaction illustration.

[0047] Figure 3 is a flowchart of a channel information feedback method according to some embodiments. As shown in Figure 3, the method includes the following steps 301 and 302:

[0048] In step 301, X CSI-RS resource groups are determined.

[0049] X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0050] For example, a CSI-RS resource group includes one or more CSI-RS resources, and each CSI-RS resource includes CSI-RS configuration information. CSI-RS is used to measure downlink channel status, which may include channel quality and channel response. Thus, this disclosure allows for channel measurement by configuring different CSI-RS resource groups, adapting to different scenarios and requirements.

[0051] In some embodiments, multiple CSI-RS resources (or multiple CSI-RS resource groups) can be configured in the current communication system, and the first node can determine X CSI-RS resource groups from the configured multiple CSI-RS resources (or multiple CSI-RS resource groups).

[0052] In step 302, the relevant information of the X CSI-RS resource groups is sent to the second node.

[0053] For example, the relevant information for X CSI-RS resource groups can be the information involving X CSI-RS resource groups fed back by the first node during channel feedback.

[0054] Based on the above technical solution, the first node can determine X CSI-RS resource groups and send the relevant information of these X CSI-RS resource groups to the second node. X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources. In actual wireless communication scenarios, the channel environment between the transmitting and receiving ends is often complex, especially in scenarios with abundant multipath propagation. For example, when multiple nodes serve a single terminal, even a slight movement of the terminal's position can prevent the signals from being positively superimposed, resulting in deep spatial attenuation. This disclosure allows the first node to select (or determine) CSI-RS resource groups and then feed back the relevant information of the determined CSI-RS resource groups to the second node. This enables the second node to manage spatial resources based on the relevant information fed back by the first node, thereby reducing or avoiding the problem of multiple signals not being positively superimposed during transmission, ensuring signal reception performance, and improving the user's communication experience.

[0055] In some embodiments, when X is greater than 1, the X CSI-RS resource groups correspond to X first groups, and the X first groups are at least one of the following:

[0056] There are X time-domain resource groups, and each of the X time-domain resource groups includes one or more time-domain units;

[0057] There are X time-domain layer resource groups. Each time-domain layer resource group includes one or more time-domain layer resources. Each time-domain layer resource is a data layer group on a time-domain resource.

[0058] There are X layer groups, and each of the X layer groups includes one or more data layers;

[0059] There are X frequency domain resource groups, and each of the X frequency domain resource groups includes one or more frequency domain elements;

[0060] There are X time-frequency resource groups, and each resource in the X time-frequency resource groups is a time-frequency resource.

[0061] There are X frequency domain layer resource groups. Each frequency domain layer resource group includes one or more frequency domain layer resources. Each frequency domain layer resource is a data layer group on a frequency domain resource.

[0062] There are X time-frequency domain layer resource groups. Each time-frequency domain layer resource group includes one or more time-frequency layer resources. Each time-frequency domain layer resource is a data layer group on a time-frequency domain resource.

[0063] In other words, for example, when X>1 and there are multiple CSI-RS resource groups, the X CSI-RS resource groups in this disclosure can correspond to X first groups. After receiving the X CSI-RS resource groups, the second communication node determines the channel state information of each of the X first groups according to the correspondence between the X CSI-RS resource groups and the X first groups, or determines that there is a correspondence between the preferred channel state information of each first group in the time domain, frequency domain, and data layer.

[0064] The division method of the aforementioned X first groups can be determined by the first node and / or the second node. For example, the second node can determine the division method of the X first groups and notify the first node of the determined division method. Alternatively, the first node can determine the division method of the X first groups and feed back the division method of the X first groups to the second node in the channel state information. The second node can also configure multiple division methods and configure these multiple division methods to the first node, so that the first node can select one or more division methods from the configured multiple division methods and feed back the selected division method to the second node. For example, the first node can feed back the index of the selected division method to the second node.

[0065] In some embodiments, the relevant information of the X CSI-RS resource groups includes the division method of the X first groups; and / or the division method of the X first groups is determined based on the received signaling information.

[0066] For example, the first node can provide feedback on the relevant information of the corresponding CSI-RS resource group for each of the X first groups.

[0067] In some embodiments, at least one of the X time-domain resource groups includes time-discontinuous time-domain resources; and / or,

[0068] The X CSI-RS resource groups correspond to X first groups, including: the channel state information on each of the X first groups is determined based on one of the X CSI-RS resource groups; a correspondence exists between a CSI-RS resource group and a first group; and / or,

[0069] The relevant information for X CSI-RS resource groups includes the channel state information of each CSI-RS resource group. The channel state information of one CSI-RS resource group is adapted to one of the X first groups, and there is a correspondence between one CSI-RS resource group and one first group.

[0070] In some embodiments, each time-domain unit of a time-domain resource group includes the CSI-RS signal of each CSI-RS resource in the CSI-RS resource group corresponding to the time-domain resource group; or, one or more time-domain units of a time-domain resource group are time-domain units after a predetermined time, the predetermined time being determined according to the transmission time of the first node transmitting relevant information of X CSI-RS resource groups.

[0071] Taking time-domain resource groups as an example, as shown in Figure 4, Figure 4 includes two time-domain resource groups. For occasions with CSI-RS transmission, the first time-domain resource group includes occasions 1, 3, and 5. Each of these occasions includes all CSI-RS resources in the first CSI-RS resource group corresponding to the first time-domain resource group. The second time-domain resource group includes occasions 2, 4, and 6. Each of these occasions also includes all CSI-RS resources in the first CSI-RS resource group corresponding to the first time-domain resource group. That is, the CSI-RS signals of all CSI-RS resources occupy time-frequency resources in each occasion. For occasions with predicted CSI-RS transmission, the first time-domain resource group includes occasions 7, 9, and 11, and the second time-domain resource group includes occasions 8, 10, and 12. For predicted occasions, CSI-RS resources may not necessarily be included.

[0072] In other words, multiple time-domain resource groups can include time-domain resources with CSI-RS resource transmissions, as well as predicted time-domain resources. The time-domain resources in multiple time-domain resource groups can be continuous or discontinuous.

[0073] In some embodiments, the time domain resource indices of the multiple time domain resources are non-contiguous. There are time domain resources in time domain resource group 2 between the two time domain resources included in time domain resource group 1. As shown in Figure 4, time domain resource group 1 (as described in the first time domain resource group above) includes time domain resources {1,3,5}, and time domain resource group 2 (as described in the second time domain resource group above) includes time domain resources {2,4,6}. This partitioning method is applicable to the spatial deep fading phenomenon shown in Figure 1. In communication scenarios where space alternates, as the terminal moves, time also alternates; in this case, spatial deep fading can also be referred to as temporal deep fading.

[0074] In some embodiments, the first node can also report the number of time-domain resource groups, which includes 1 and values ​​greater than 1. When the feedback is 1, it indicates that the first node's movement speed is relatively slow, and / or the spatial frequency vectors of each AP arriving at the first node are not significantly different, so there is no deep time decay. When the feedback is greater than 1, it indicates that the first node's movement speed is relatively fast, and / or the spatial frequency vectors of each AP arriving at the first node are significantly different, resulting in different channel states at different times. In this case, the time-domain resources are divided into multiple time-domain resource groups. In Figure 1, where multiple APs transmit simultaneously at locations with very small correlation values, some APs can be selected to communicate with the terminal, avoiding the situation where the signals of multiple APs are negatively superimposed, such as the dark area in Figure 1. In the case corresponding to the dark area in Figure 1, the signals of multiple APs are negatively superimposed, resulting in very low received signal power. In this case, it is better to use only one AP to send a signal to the terminal. Therefore, the scheme in Figure 4 can be adopted, selecting different AP combinations to serve the terminal on different time-domain resources. For example, time-domain resource group 1 in Figure 4 includes time-domain resources {1, 3, 5}, corresponding to the light-colored part in Figure 1. In this case, the signals from the two APs are positively superimposed at the receiving end. Therefore, time-domain resource group 1 uses {CSI-RS resource 1, CSI-RS resource 2} to send signals to the terminal. Time-domain resource group 2 in Figure 4 includes time-domain resources {2, 4, 6}, corresponding to the dark-colored part in Figure 1. In this case, if the two APs send signals of the same layer to the terminal, negative superposition of signals will occur. Therefore, only one AP needs to send this layer of data to the terminal. Here, different CSI-RS resources are sent by different APs, and / or by different transmission beams of the same AP.

[0075] With more access points (APs), the corresponding time decay is faster, and the granularity of time-domain changes is smaller. Therefore, the larger the total number of selected CSI-RS resources corresponding to multiple time-domain resources, the smaller the number of consecutive time-domain resources included in each time-domain resource group, and / or the smaller the unit length of the time-domain resources. That is, the time length of the time-domain resources in time-domain resource group 1 or time-domain resource group 2 in Figure 4 is smaller. Or, the number of predetermined time-domain units included in each time-domain resource is smaller.

[0076] For example, when multiple time-domain resources correspond to the same CSI-RS resource, the number of time-domain resource groups can be one or more, and each time-domain resource group includes consecutive time-domain resources. In this case, multiple time-domain resource groups correspond to the same CSI-RS resource group, but different time-domain resource groups correspond to different precoding information, particularly different spatial vector selection information. When there are more than one time-domain resource group, different time-domain resource groups correspond to different spatial selection information. In this case, the signal transmitted through a single AP reaches the first node via multipath, selecting different multipath sets (i.e., spatial selection information) on different time-domain resource groups. The angular spread of multipath caused by a single AP is smaller than that caused by multiple APs, so the granularity of time-domain changes is larger in this case.

[0077] When selecting more than one CSI-RS resource across multiple time-domain resources, the number of time-domain resource groups can also be greater than one, and each time-domain resource group includes non-contiguous time-domain resources. This is because the angular spread of multipath caused by a single AP is relatively small, while the angular spread of multipath caused by multiple APs is relatively large, leading to a more severe deep fading problem and thus faster temporal deep fading.

[0078] Furthermore, some embodiments of this disclosure are also applicable to cases where the number of selected CSI-RS resources corresponding to multiple time-domain resources is greater than 1, and each time-domain resource includes only consecutive time-domain units, because the spatial deep attenuation variation of the channel depends on the moving speed of the first node and the predicted time length.

[0079] In some embodiments, X CSI-RS resource groups correspond to X first groups, and relevant information of the determined CSI-RS resource group is fed back for each first group. Each of the X first groups can be a time domain, frequency domain, data layer, or a combination of the above types of resources, and this disclosure does not limit this. For example, for a time domain resource group, relevant information of the selected CSI-RS resource group can also be fed back for each layer group.

[0080] As shown in Figure 4, Figure 4 includes two layer groups and two time-domain resource groups. For {time-domain resource group 1, layer group 1}, the selected CSI-RS resource group 1 is fed back; for {time-domain resource group 1, layer group 2}, the selected CSI-RS resource group 2 is fed back; for {time-domain resource group 2, layer group 1}, the selected CSI-RS resource group 3 is fed back; for {time-domain resource group 2, layer group 2}, the selected CSI-RS resource group 4 is fed back.

[0081] The layer grouping is the same in both of the aforementioned time-domain resource groups. In some embodiments, the layer grouping differs depending on the Rank Indication (RI) corresponding to different time-domain resource groups.

[0082] Taking a frequency domain resource group as an example, for each frequency domain resource group, due to the large delay spread of the channel between multiple nodes and a terminal and the rapid changes in the frequency domain, the first node in this disclosure can feed back the determined CSI-RS resource group for each frequency domain resource group, i.e., node selection information, beam selection information, or spatial selection information. The number of non-zero values ​​of the precoding vector on each frequency domain resource group is determined based on the total number of CSI-RS ports included in the CSI-RS resources of the selected CSI-RS resource group on that frequency domain resource group.

[0083] Taking the data layer as an example, each layer group provides feedback on the selected CSI-RS resource group. Each layer group includes one or more data layers, which can also be called precoding layers.

[0084] In some embodiments, the CSI-RS resource group corresponding to each precoding layer group needs to be fed back separately. For example, the CSI-RS resource group corresponding to each precoding layer group is different. For instance, the CSI-RS resource group corresponding to layer 1 is {CSI-RS1, CSI-RS2, CSI-RS3}, and the CSI-RS resource group corresponding to layer 2 is {CSI-RS1, CSI-RS2}. Data from multiple layer groups are transmitted on the same time-frequency resources.

[0085] In some embodiments, the non-zero elements in the precoding vector of each layer group are determined by the CSI-RS resources included in the CSI-RS resource group corresponding to each layer group. For example, the number of non-zero elements in the precoding vector of layer 1 is the number of CSI-RS ports included in the CSI-RS resource group {CSI-RS1, CSI-RS2, CSI-RS3}, such as N. ant *3. The number of non-zero elements in the Layer 2 precoding vector is equal to the number of CSI-RS ports included in the CSI-RS resource group {CSI-RS1, CSI-RS2}, for example, N. ant *2.

[0086] Since the channel state may differ under different time domain, frequency domain, data layer and other resource groups, the fixed precoding combination scheme in related technologies may lead to the problem that the actual channel and the measured channel are too different, affecting the communication quality. Therefore, in this disclosure, the first node can determine the corresponding CSI-RS resource group for each first group, and then report the relevant information of the selected CSI-RS resource group, so as to avoid the above-mentioned problem and ensure the communication quality.

[0087] In some embodiments, when a CSI-RS resource belongs to at least two of the X CSI-RS resource groups, all or part of the information of the precoded information corresponding to the CSI-RS resource is the same in at least two first groups corresponding to the at least two CSI-RS resource groups.

[0088] For example, if a CSI-RS resource is selected by multiple time-domain resource groups, then all or part of the precoding information of that CSI-RS resource is the same across multiple time-domain resource groups, thereby reducing data usage. For instance, the spatial information of each AP corresponding to each CSI-RS resource remains unchanged across multiple time-domain resource groups; only the relevant information between the CSI-RS resources changes.

[0089] The above scheme addresses spatial deep attenuation by selecting different CSI-RS resource groups on different first groups, thereby choosing different AP combinations or beam combinations on different first groups. In low-frequency transmission, the terminal can provide feedback on the channel state information corresponding to each CSI-RS resource group. When the same CSI-RS resource is selected by multiple CSI-RS resource groups, all or part of the precoding of the same CSI-RS resource is shared across multiple CSI-RS resource groups.

[0090] In some embodiments, where X CSI-RS resource groups correspond to X first groups, the first node can report the relevant information of the CSI-RS resource group corresponding to each first group separately.

[0091] For example, when the first group is a time-domain resource group, the first node reports the channel quality information corresponding to the CSI-RS resource group for each of the multiple time-domain resource groups. Since the channels in some time-domain resource groups are positively superimposed and the channels in others are negatively superimposed, and the channel quality is different in different time-domain resource groups, the channel quality information of the CSI-RS resource group can be reported separately for each of the multiple time-domain resource groups.

[0092] Similarly, for the first group being a frequency domain resource group, the first node reports the channel quality information of the CSI-RS resource group for each frequency domain resource group across multiple frequency domain resource groups. For the first group being a time-frequency domain resource group, the first node reports the channel quality information of the CSI-RS resource group for each time-frequency domain resource group across multiple time-frequency domain resource groups. The time-frequency resources in a time-frequency domain resource group include a time-domain resource index and a frequency-domain resource index; different time-frequency resources correspond to different time-domain resource indices and / or frequency-domain resource indices. For the first group being a time-frequency domain layer resource group, for each time-frequency resource group and for each layer group, the first node reports the channel quality information of the CSI-RS resource group.

[0093] In some embodiments, the channel state of at least one of the X CSI-RS resource groups satisfies a first predetermined characteristic; and / or the X CSI-RS resource groups are determined according to the first predetermined characteristic that the channel state of each CSI-RS resource group needs to satisfy.

[0094] The first predetermined feature can be determined by the first node and / or the second node. For example, the first predetermined feature can be indicated by the second node to the first node, or it can be determined by the first node and then fed back to the second node. Alternatively, the second node can configure multiple grouping criteria, and the first node can select one or more grouping criteria from these criteria and feed them back to the base station, thus determining the first predetermined feature that the channel state of the CSI-RS resource group must satisfy. This first predetermined feature can also be referred to as the grouping criteria used by the first node to determine X CSI-RS resource groups.

[0095] In some embodiments, each CSI-RS resource group in at least one CSI-RS resource group includes at least two CSI-RS resources, and the channel state of each CSI-RS resource group in at least one CSI-RS resource group satisfies a first predetermined characteristic including at least one of the following:

[0096] CSI-RS resources in a CSI-RS resource group can be received simultaneously by the first node;

[0097] The channel measurements of CSI-RS resources in the CSI-RS resource group satisfy the second predetermined characteristic;

[0098] CSI-RS resources in a CSI-RS resource group correspond to the same data layer; or,

[0099] The CSI-RS resources in the CSI-RS resource group correspond to different data layers.

[0100] In some embodiments, the channel measurement includes at least one of the following:

[0101] Delay spread measurement, angle spread measurement, Doppler spread measurement, frequency domain variation measurement of the packet channel corresponding to the CSI-RS resource group, time domain variation measurement of the packet channel corresponding to the CSI-RS resource group, frequency domain variation measurement of the channel quality of the packet channel, and time domain variation measurement of the channel quality of the packet channel.

[0102] A packet channel can also be referred to as a channel obtained from multiple CSI-RS resources within a CSI-RS resource group. Delay spread refers to the time difference between the arrival of signals from different paths at the receiver during multipath propagation. A larger delay spread results in more severe frequency-selective fading, thus affecting communication. Angular spread refers to the angular distribution range of a signal arriving at the receiver. Doppler spread refers to the distribution range of frequency offset caused by movement. Angular spread and Doppler spread are related; a larger angular spread results in a larger Doppler spread.

[0103] The frequency domain variation measurements of the packet channel corresponding to the CSI-RS resource group are used to characterize the changes in the channel state of the packet channel in the frequency domain. The time domain variation measurements of the packet channel corresponding to the CSI-RS resource group are used to characterize the changes in the channel state of the packet channel in the time domain.

[0104] Frequency domain variation measurements of packet channel quality characterize the changes in channel quality strength in the frequency domain. Time domain variation measurements of packet channel quality characterize the changes in channel quality strength in the time domain.

[0105] For example, channel measurements of CSI-RS resources in a CSI-RS resource group that satisfy a second predetermined characteristic may include at least one of the following:

[0106] The delay spread measurement value is less than the first preset value;

[0107] The measured angle extension value is less than the second preset value;

[0108] The Doppler extension measurement value is less than the third preset value;

[0109] The frequency domain variation measurement value of the packet channel corresponding to the CSI-RS resource group is less than the fourth preset value;

[0110] The time-domain variation measurement value of the packet channel corresponding to the CSI-RS resource group is less than the fifth preset value;

[0111] The frequency domain variation measurement of the channel quality of the packet channel is less than the sixth preset value;

[0112] The time-domain variation measurement of the channel quality of the packet channel is less than the seventh preset value.

[0113] The aforementioned angle spread measurement value being less than the second preset value can also mean that the angle difference is less than the second preset value, and the aforementioned Doppler spread measurement value being less than the third preset value can also mean that the Doppler frequency shift is less than the third preset value. The aforementioned preset values ​​can be preset values ​​jointly agreed upon by the first node and the second node, without the need for signaling notification. Alternatively, the aforementioned preset values ​​can also be preset values ​​notified by the second node to the first node, or the aforementioned preset values ​​can also be feedback values ​​fed back from the first node to the second node.

[0114] For example, the second node notifies the first node that the first predetermined feature is simultaneous reception. In this case, the first node selects a CSI-RS resource group capable of simultaneous reception and ensures the maximum Reference Signal Receiving Power (RSRP). At this time, no restrictions are placed on the delay spread, angle spread, or Doppler spread of the CSI-RS resources in the CSI-RS resource group.

[0115] For example, if the second node notifies the first node that the first predetermined feature is simultaneous reception and requires the delay spread measurement value to be less than a first preset value, then when the first node feeds back the CSI-RS resource group, it must not only determine whether the CSI-RS resource group can be received simultaneously, but also whether the delay spread measurement value is less than the first preset value. If the delay spread measurement value is less than the first preset value, it means that when the second node uses the beam in that CSI-RS resource group to send the same data layer data to the first node in the future, the channel frequency selection will be slower.

[0116] For example, if the second node notifies the first node that the first predetermined feature is simultaneous reception, and requires that the delay spread measurement value be less than the first preset value and the Doppler spread measurement value be less than the third preset value, then when the first node feeds back the CSI-RS resource group, it is required not only to determine whether the CSI-RS resource group can be received simultaneously, but also to determine whether the delay spread measurement value is less than the first preset value and whether the Doppler spread measurement value is less than the third preset value.

[0117] For example, if the second node notifies the first node that the first predetermined feature is that the Doppler spread measurement value is less than the third preset value, then when the first node determines the CSI-RS resource group, it must determine the CSI-RS resource group based on whether the Doppler spread measurement value is less than the third preset value.

[0118] In the example above, the second node may notify a first predetermined feature for determining the X CSI-RS resources, and the first node determines the X CSI-RS resource group based on the notified first predetermined feature.

[0119] If different CSI-RS resources in a CSI-RS resource group are used to transmit different data layers, then, in addition to being able to receive simultaneously, the CSI-RS resources in the CSI-RS resource group should also try to ensure that the channel quality of each CSI-RS resource in the CSI-RS resource group is maximized and the mutual interference between different CSI-RS resources is minimized.

[0120] If different CSI-RS resources in a CSI-RS resource group are for transmitting the same data layer, then in addition to being able to receive simultaneously, the CSI-RS resources in the CSI-RS resource group must also ensure that the channel measurements meet the second predetermined characteristic mentioned above.

[0121] In some embodiments, when the channel measurements include at least one of delay spread measurements, angle spread measurements, and Doppler spread measurements, the channel measurements of the CSI-RS resources in the CSI-RS resource group satisfy a second predetermined characteristic, including:

[0122] The channel measurement values ​​of any two CSI-RS resources in the CSI-RS resource group are less than a predetermined value, and / or the distribution of channel measurement values ​​of all CSI-RS resources in the CSI-RS resource group satisfies the second predetermined characteristic.

[0123] For example, as shown in Figure 5, AP1's transmit beams include beams 11, 12, and 13, while AP2's transmit beams include beams 21, 22, and 23. In high-frequency scenarios, each AP can transmit multiple radio frequency beams, and each transmit beam corresponds to a CSI-RS resource; that is, this CSI-RS resource is transmitted using this beam. The terminal determines X CSI-RS resource groups from multiple CSI-RS resources. Different beams of one AP can be in different CSI-RS resource groups, and different beams of different APs can be in the same CSI-RS resource group. For example, a CSI-RS resource group consists of CSI-RS resource 13 and CSI-RS resource 21. The base station notifies the terminal of two CSI-RS resource sets: the first CSI-RS resource set consists of CSI-RS resources {11, 12, 13}, and the second CSI-RS resource set consists of CSI-RS resources {21, 22, 23}. Furthermore, the base station requires that multiple CSI-RS resources in a CSI-RS resource group determined by the terminal come from different CSI-RS resource sets.

[0124] CSI-RS resource 13 is transmitted by AP1 using beam 13, and CSI-RS resource 21 is transmitted by AP2 using beam 21. Each CSI-RS resource consists of one or two ports, and each CSI-RS resource corresponds to one transmit beam of one AP. A CSI-RS resource group determined by the terminal consists of CSI-RS resource 13 and CSI-RS resource 21.

[0125] The first node obtains the channel measurement result H in row Rx and column 2*T based on CSI-RS resource 13. 13,Rx*(2*T) The first node obtains the channel measurement result H, consisting of Rx rows and 2*T columns, based on CSI-RS resource 21. 21，Rx*(2*T) .

[0126] T represents the number of ports included in each CSI-RS resource, and Rx is the number of receive antennas in the first node.

[0127] In some embodiments, the packet channel is a channel obtained by using ports of different CSI-RS resources in a CSI-RS resource group as different measurement ports. For example, if the delay spread measurement value is less than a first preset value, it indicates that the packet channel H... Total =[H 13,Rx*(2*T) H 21,Rx*(2*T) The corresponding delay spread is less than the first predetermined value, which can also be expressed as H. 21,Rx*(2*T) and H 13,Rx*(2*T) The average delay difference is less than the predetermined value.

[0128] When the time delay spread measurement value is less than the first preset value, it indicates that when the two beams are used to send the same data layer to the first node in the future, the frequency selection of the channel will be slower.

[0129] In some embodiments, if a faster frequency selection feature is required, the delay spread measurement of the CSI-RS resources in the feedback CSI-RS resource group can be configured to be greater than a first predetermined value.

[0130] Similarly, if the angle spread measurement is less than the second preset value, it indicates that the packet channel H... Total The angle expansion is less than the second preset value, which will not be elaborated here.

[0131] In some embodiments, the grouped channel is the sum of channels obtained from the ports of different CSI-RS resources in a CSI-RS resource group. For example, combining the above example, H Total,1 =H 13,Rx*(2*T) +H 21,Rx*(2*T) H Total,1 This refers to the sum of channels on multiple CSI-RS resources within a CSI-RS resource group. In other words, a grouped channel can be a channel H that treats ports on different CSI-RS resources as different measurement ports. TotalAlternatively, the grouped channel is the channel H obtained by summing the channels obtained from the ports of different CSI-RS resources. Total,1 .

[0132] Based on the above technical solution, the X CSI-RS resource groups in this disclosure are CSI-RS resource groups determined by the first node based on a first predetermined feature of the channel state. In this way, the first node can select a CSI-RS resource group that is more suitable for subsequent transmission from multiple CSI-RS resources, thereby performing channel feedback. After receiving the feedback information from the terminal, the second node uses an appropriate beam combination to send a signal to the terminal, ensuring the quality of subsequent communication.

[0133] In some embodiments, the relevant information for the X CSI-RS resource groups includes information for each of the X CSI-RS resource groups, and the information for each CSI-RS resource group includes at least one of the following:

[0134] Each CSI-RS resource group includes index information for CSI-RS resources;

[0135] Each CSI-RS resource group includes channel quality information for each CSI-RS resource;

[0136] Channel quality information for the packet channels corresponding to each CSI-RS resource group;

[0137] Channel measurements for each CSI-RS resource group;

[0138] Precoding information corresponding to each CSI-RS resource group; or,

[0139] Rank information for each CSI-RS resource group.

[0140] In some embodiments, channel quality information includes at least one of the following: RSRP, Signal to Interference Plus Noise Ratio (SINR), and Channel Quality Indicator (CQI).

[0141] The grouped channels and channel measurements can be found above and will not be repeated here. The rank information for each CSI-RS resource group can be RI.

[0142] In some embodiments, the first node may feed back the channel quality information of each CSI-RS resource in the CSI-RS resource group, or the channel quality information of the group channel formed by the CSI-RS resources in the CSI-RS resource group (i.e., the channel quality information corresponding to the aforementioned group), or the first node may feed back both the channel quality information of each CSI-RS resource and the channel quality information of the group channel corresponding to the CSI-RS resource group.

[0143] For example, when the second node reports that the CSI-RS resources in the CSI-RS resource group correspond to the same data layer, the first node reports the channel quality information of the packet channel. The channel quality information of the packet channel may not be equal to the sum of the channel quality information corresponding to all CSI-RS resources in the CSI-RS resource group, but rather takes into account the channel quality after spatial deep fading. For example, the channel quality information of the packet channel might be H in the example above. Total The channel quality, or the channel quality information of the grouped channel is the sum of the channel quality of multiple CSI-RS resources in the CSI-RS resource group, such as H in the example above. Total,1 Channel quality.

[0144] When the channels of two APs can be forward superimposed, the channel quality corresponding to the packet channel of the CSI-RS resource group is greater than or equal to the sum of the channel qualities of all CSI-RS resources in the CSI-RS resource group. When the channels of two APs cannot be forward superimposed, the channel quality corresponding to the packet channel of the CSI-RS resource group is less than the sum of the channel qualities of all CSI-RS resources in the CSI-RS resource group.

[0145] For example, as shown in Figure 5, a CSI-RS resource group consists of CSI-RS resource 13 and CSI-RS resource 21. CSI-RS resource 13 is transmitted by AP1 using beam 13, and CSI-RS resource 21 is transmitted by AP2 using beam 21. Each CSI-RS resource consists of one or two ports, and each CSI-RS resource corresponds to one transmit beam of one AP. The first node obtains the channel measurement result H in Rx rows and 2*T columns based on CSI-RS resource 13. 13,Rx*(2*T) The first node obtains the channel measurement result H, which is Rx rows and 2*T columns, based on CSI-RS resource 21. 21,Rx*(2*T) .

[0146] Taking CSI-SR resource group 1, which includes the first CSI-RS resource and the second CSI-RS resource, as an example, the relevant information of CSI-SR resource group 1 reported by the first node can be one of the following Tables 1-7.

[0147] Table 1 Reporting Method 1

[0148] Table 2 Reporting Method Two

[0149] Table 3 Reporting Method 3

[0150] Table 4 Reporting Method Four

[0151] Table 5 Reporting Method Five

[0152] Table 6 Reporting Method Six

[0153] Table 7 Reporting Method Seven

[0154] The channel quality information corresponding to the CSI-RS resource group is the same as the channel quality information of the aforementioned grouped channel, and the channel measurement value corresponding to the CSI-RS resource group is the same as the channel measurement value of the aforementioned grouped channel. The grouped channel can be referred to the above explanation, and will not be repeated here. The table above shows the case for one CSI-RS resource group. When the first node needs to feed back multiple CSI-RS resource groups, each CSI-RS resource group can be fed back in the above manner.

[0155] In some embodiments, at least one CSI-RS resource group exists among the X CSI-RS resource groups, each CSI-RS resource group includes only one CSI-RS resource, and the relevant information of the X CSI-RS resource groups includes at least one of the following:

[0156] Multiple channel state information of one CSI-RS resource in each CSI-RS resource group in at least one CSI-RS resource group, with the multiple channel state information corresponding to multiple first groups;

[0157] The channel quality information of one CSI-RS resource in each CSI-RS resource group in at least one CSI-RS resource group varies across multiple first groups;

[0158] Channel state information includes at least one of the following: precoding information, channel quality information.

[0159] For example, one CSI-RS resource corresponds to multiple first groups, and multiple first groups correspond to multiple precoding information. Each first group corresponds to one precoding information among the multiple precoding information. In multipath rich scenarios, a signal emitted by an AP reaches the receiver through multiple paths. At this time, for the receiver, multiple paths are equivalent to coming from multiple scatterers. Treating multiple scatterers as multiple virtual APs, spatial deep attenuation will also occur. To address this, multipath selection information can be determined separately for different first groups. For example, spatial vector information can be determined separately for different first groups. The precoding vector is formed by superimposing spatial vectors. In particular, different first groups are different spatial vector groups or combination coefficients of different spatial vector groups selected from a set of spatial vectors. Similarly, different CSI-RS resources are selected for different first groups. It can be considered that different spatial vectors correspond to different paths in the multipath channel, and different CSI-RS resources also correspond to different paths in the multipath channel. The two have different forms of representation; the former is used to determine the precoding vector, and the latter is used to determine the CSI-RS resource.

[0160] At this point, each CSI-RS resource group in the at least one CSI-RS resource group can also be referred to as a CSI-RS resource, because each CSI-RS resource group in the at least one CSI-RS resource group includes only one CSI-RS resource.

[0161] Multiple first groups include at least one of the following: multiple time-domain resource groups, multiple frequency-domain resource groups, and multiple time-frequency resource groups. Channel quality information includes at least one of the following: RSRP, SINR, and Reference Signal Receiving Quality (RSRQ).

[0162] For example, the first node reports the channel quality information for a CSI-RS resource group. In a single report, the first node can report the channel quality information for this CSI-RS resource separately for each time-domain resource group across multiple time-domain resource groups.

[0163] Similarly, the first node can report the channel quality information of the CSI-RS resource for each frequency domain resource group on multiple frequency domain resource groups.

[0164] Alternatively, the first node can report the channel quality information of the CSI-RS resource separately for each of the multiple time-frequency domain resource groups. Each time-frequency resource includes a time-domain resource index and a frequency-domain resource, with different time-frequency resources corresponding to different time-domain resource indices and / or frequency-domain resource indices.

[0165] And / or, for each time-frequency resource group, for each layer group, report the channel quality information of this CSI-RS resource separately.

[0166] At this point, a CSI-RS resource is transmitted by one or more APs. When a CSI-RS resource is transmitted by multiple APs, different ports within this CSI-RS resource can be transmitted by different APs, or the same port of this CSI-RS resource can be transmitted by multiple APs. That is, compared to the above embodiment, different CSI-RS resources within multiple CSI-RS resources are transmitted by different APs. In this case, one CSI-RS resource corresponds to multiple APs; for example, the same port of a CSI-RS resource is transmitted by multiple APs. This reduces the complexity of the first node measuring and selecting CSI-RS resources and the complexity of reporting the index of the selected CSI-RS resources.

[0167] At this point, a CSI-RS resource can be a CSI-RS resource configured by the second node that requires the first node to report channel quality, or it can be a CSI-RS resource selected by the first node from multiple CSI-RS resources. In this case, the first node can also select multiple CSI-RS resources and report the index of the selected CSI-RS resources. The reporting of channel state information for each selected CSI-RS resource can be at the time-domain resource group level, the frequency-domain resource group level, the time-frequency resource group level, or the time-frequency layer group level.

[0168] In some embodiments, the second node may also notify the first node how the channel quality information of a selected CSI-RS resource is reported: whether to report only one set of channel quality information, or to report one set of channel quality information for each time domain resource group, or each frequency domain resource group, or each time-frequency resource group, or each time-frequency resource group and layer group.

[0169] For example, the first node selects a CSI-RS resource from multiple CSI-RS resources and reports the channel quality information of the selected CSI-RS resource. The multiple CSI-RS resources include CSI-RS resource set 1 and CSI-RS resource set 2.

[0170] When the selected CSI-RS resource belongs to CSI-RS resource set 1, the channel quality reporting method of this CSI-RS resource can be time domain resource group level, frequency domain resource group level, time-frequency resource group level, or time-frequency resource layer group level.

[0171] When the selected CSI-RS resource belongs to CSI-RS resource set 2, only one channel quality of this CSI-RS resource is reported in a single report, without specifying the time-domain resource level, frequency-domain resource level, or time-frequency resource level. For example, a CSI-RS resource in CSI-RS resource set 1 is transmitted by multiple APs, and the channel has obvious frequency-selective and time-selective characteristics, while a CSI-RS resource in CSI-RS resource set 2 is transmitted by a single AP, and the channel does not have obvious frequency-selective and time-selective characteristics.

[0172] For example, the first node feeds back the selected channel quality information reporting method and reports the selected reporting method to the second node. For instance, does the first node report to the second node that it is reporting only one piece of channel quality information, or that the reported information includes multiple pieces of channel quality information?

[0173] Multiple channel quality information sets correspond to multiple time-domain resource groups, or multiple frequency-domain resource groups, or multiple time-frequency resource groups, or a combination of multiple time-frequency resource groups and layer groups. Due to the relationship between the movement direction of the first node and the direction of the spatial basis vector, the granularity of its channel quality changes over time is also different. Therefore, the first node can report channel quality information to the second node based on the measurement reporting method.

[0174] In some embodiments, each CSI-RS resource group of at least one CSI-RS resource group includes one CSI-RS resource corresponding to multiple sets of quasi-co-located reference signal configuration information.

[0175] In some embodiments, a CSI-RS resource group includes multiple CSI-RS resources that each correspond to a quasi-co-located reference signal configuration information.

[0176] In some embodiments, the relevant information of X CSI-RS resource groups is included in a reporting message, and the reporting message is reported on a channel and / or a time domain unit; and / or, the relevant information of the X CSI-RS resource groups is associated with the same predetermined channel state information. For example, the predetermined channel state information includes at least one of the following: precoding information, channel quality information, and rank indication information.

[0177] In traditional channel state information (CSO) reporting methods, in scenarios where CSO changes rapidly, the time-varying characteristics of CSO are tracked through multiple time-division multiple reports by shortening the reporting cycle. This disclosure, however, reflects the changing patterns of CSO in a single report or a single report within a predetermined time period, allowing the second node to better schedule future data communication resources. Compared to traditional methods, this disclosure can extend the transmission period of the measurement reference signal and also extend the reporting period of the first node, saving downlink and reporting resources and reducing power consumption.

[0178] In some embodiments, the relevant information for the X CSI-RS resource groups includes the precoding information corresponding to each of the X CSI-RS resource groups.

[0179] Each layer of the precoding information corresponding to a CSI-RS resource group consists of z*P sub-vectors, and the number of elements in the precoding vector is equal to the sum of the number of elements in the z*P sub-vectors.

[0180] P represents the number of CSI-RS resources included in a CSI-RS resource group, and z is a positive integer less than or equal to 3. For each of the P CSI-RS resources in a CSI-RS resource group, each CSI-RS resource corresponds to one of the z sub-vectors in z*P sub-vectors. Different CSI-RS resource groups in X CSI-RS resource groups may have the same or different number of CSI-RS resources P.

[0181] For example, the z mentioned above is used to characterize the antenna polarization. For a single-polarized AP antenna, the precoding vector for each layer includes P sub-vectors. For a dual-polarized AP antenna, the precoding vector for each layer includes 2*P sub-vectors. Of course, z can also represent the number of antenna groups.

[0182] In some embodiments, the z sub-vectors are determined by one or more parameters; the one or more parameters include at least one of the following: one or more first time-domain basis vectors, one or more first frequency-domain basis vectors.

[0183] Each element in a first time-domain basis vector corresponds to a first time-domain unit, and each element in a first frequency-domain basis vector corresponds to a first frequency-domain unit.

[0184] Based on the above technical solution, the precoding vector in this disclosure can be generated by time-domain basis vectors and / or frequency-domain basis vectors. There is a correspondence between time-domain basis vectors and time-domain units, and a correspondence between frequency-domain basis vectors and frequency-domain units. Thus, the precoding vector constructed in this disclosure can change based on changes in the frequency domain and / or time domain, and is suitable for communication scenarios where the channel state changes with the frequency domain and / or time domain.

[0185] In some embodiments, one or more parameters may further include at least one of a second time-domain basis vector and a second frequency-domain basis vector.

[0186] The second time-domain basis vector is used to characterize the deviation of the channel state of different CSI-RS resources in the time domain, and the second frequency-domain basis vector is used to characterize the deviation of the channel state of different CSI-RS resources in the frequency domain. The channel of a CSI-RS resource is the channel measured by the first node based on the measurement reference signal in the CSI-RS resource.

[0187] For example, as shown in Figure 6, Figure 6 is used to characterize the correlation between the precoding of the initial target position (x0, y0, z0) obtained based on the precoding vectors provided in some embodiments of this disclosure and the channels at different positions (x, y, z). Compared with the correlation in Figure 1 obtained according to related technologies, the deep attenuation phenomenon is greatly improved because the technical solutions provided in some embodiments of this disclosure introduce time-domain basis vectors and / or frequency-domain basis vectors.

[0188] Since the channel states of different CSI-RS resources have excessively large differences in some scenarios, this disclosure can further adjust the precoding vector by using a second time-domain basis vector and a second frequency-domain basis vector, thereby adjusting the channel differences of the channel states of different CSI-RS resources.

[0189] It should be understood that a spatial frequency domain is (f x ,f y ,f z The complex amplitude U(x,y,z) of a plane wave at spatial position (x,y,z) satisfies the following formula 1:

[0190] (cosα, cosβ, cosγ) are the direction cosines of the plane wave's propagation direction, and λ is the wavelength. x ,f y ,f z This can also be called the spatial frequency of a plane wave. 'a' is a constant.

[0191] If there are multiple plane waves, the complex amplitude at position (x,y,z) is the superposition of these multiple plane waves, which satisfies the following formula 2:

[0192] (f x,i ,f y,i ,f z,i Let f be the spatial frequency of the i-th plane wave. Assume that at (x0, y0, z0), the spatial frequency of the i-th plane wave is (f...). x,i ,f y,i ,f z,i ), where P is the number of plane waves.

[0193] When P is greater than 1, the phase superposition effect of the P plane waves varies at different positions (x, y, z) around the preset position (x0, y0, z0). At some positions, the P plane waves superimpose in the forward direction. At some frequency domain positions, the P plane waves superimpose in the reverse direction.

[0194] With P access points (APs) and each AP having N antennas, at (x0, y0, z0), each AP and the first node can form a spatial frequency domain (f... x,i ,f y,i ,f z,i A plane wave (x, y, z) can be generated. This can form P plane waves, and the complex amplitude response of these P plane waves at (x, y, z) satisfies the following formula 3.

[0195] Referring to the example shown in Figure 7, the number of plane waves P = 2, and the spatial frequency f si =(f x,i ,f y,i ,f z,i ), i = 1, 2. Assume that in a short time, the first node moves along the straight line vt, that is, the change in the position of the first node satisfies the following formula 4: (x-x0, y-y0, z-z0) = (v x t,v y t,v z t) Formula 4

[0196] At this point, the change in the complex amplitude response of the plane wave satisfies the following formula 5:

[0197] (x-x0)f x,i +(y-y0)f y,i +(z-z0)f z,i =(v x f x,i +v y f y,i +v z f z,i )t=(f si ·v)t=b i Formula 5

[0198] (f si ·v) represents f si The inner product of b and v i =(f si ·v). Thus, Formula 3 above can be expressed by the following Formula 6:

[0199] It should be understood that even if the beams of all APs at (x0, y0, z0) are aligned with the first node, U(x, y, z) is a spatially varying function due to the different spatial frequencies of each AP. Under the assumption of Equation 4, Equation 3 becomes Equation 6, thus transforming U(x, y, z) into a time-varying function. i This can also be referred to as the Doppler frequency shift of the i-th AP. It can also be called the time-domain basis vector. Thus, under the assumptions of Equation 4, the rapid changes of the channel in space can be reflected as the rapid changes of the channel in time.

[0200] This disclosure enables the positive superposition of complex amplitudes at each (x,y,z) by precoding and compensating different APs at different times. That is, the complex amplitude U′(x,y,z) of the precoded and compensated signal at spatial location (x,y,z) satisfies the following formula 7:

[0201] W P (t) satisfies the following formula 8:

[0202] The above formula is determined assuming that the N antennas on each AP already have precoding. It can also be updated to The only difference is the symbolic representation; there is no essential distinction. Therefore, combining the compensation factor for each AP mentioned above... and the precoded V on N antennas at each AP i The precoding vector corresponding to each layer satisfies the following formula 9:

[0203] Indicates a dimension of N ant *P's precoding vector, z = 1, N ant d represents the number of antenna ports included in a CSI-RS resource. i This represents the weight coefficient corresponding to the i-th CSI-RS resource. Let b represent the first time-domain basis vector corresponding to the i-th CSI-RS resource. i ∈[0,1],V i V represents the spatial vector corresponding to the i-th CSI-RS resource. i The number of elements included is N = N ant / z. The above d i It can be a complex value, or it can be replaced with

[0204] Based on the above formula, each AP can emit a spatial frequency of f at (x0, y0, z0). si plane wave, V i It is an N-dimensional column vector. When the propagation path is a direct path, V i It is f si The function. When the propagation path is not a direct path, V i It is a function of the sending angle of the second node, f siIt is a function of the angle after scattering, or a function of the angle of arrival, at which point V i and f si They are independent of each other.

[0205] In general, f si It is a function of the angle of the plane wave at the first node (i.e., the angle of arrival), while V i It is a function of the transmission angle of the second node. When the propagation path is a direct path, the transmission angle and the angle of arrival are highly correlated; for example, the transmission angle and the angle of arrival may be the same, or the sum of the transmission angle and the angle of arrival may be 180 degrees. Therefore, b i and V i Related, including the same input parameters. When the propagation path is not a direct path, the sending angle and the arrival angle are not related, b i and V i Irrelevant.

[0206] In some examples, N ant Indicates that there are N ant An antenna array with N1 antennas in the horizontal direction and N2 antennas in the vertical direction. If each AP's antenna is single-polarized, then N... ant = N1 * N2. If each AP's antenna is dual-polarized, then N ant = 2 * N1 * N2. That is, N ant = z * N1 * N2. z is a positive integer less than or equal to 3.

[0207] V i It is V i,N1 V i,N2 functions, such as V i,N1 V i,N2 These are the N1-dimensional direction vectors in the horizontal direction and the N2-dimensional direction vectors in the vertical direction, respectively. It is V i,N1 and V i,N2 The Kronecker product.

[0208] V i,N1 The n1th element satisfies the following formula 10: V i,N1 (n1)=exp(j*2π*n1*f t,x,i ), n1=0,1,....N1-1 Formula 10

[0209] V i,N2 The n2th element satisfies the following formula 11: V i,N2 (n2)=exp(j*2π*n2*f t,y,i ), n2=0,1,....N2-1 Formula 11

[0210] or,

[0211] V i,N1 The n1th element satisfies the following formula 12: V i,N1 (n1)=exp(j*2π*n1*g1(f t,x,i )), n1=0,1,....N1-1 Formula 12

[0212] V i,N2 The n2th element satisfies the following formula 13: V i,N2 (n2)=exp(j*2π*n2*g2(f t,y,i )), n2=0,1,....N2-1 Formula 13

[0213] g1 and g2 are functions. It is a column vector of N1*N2*P*z dimensions. When the propagation path is a direct path, f t,x,i =f x,i f t,y,i =f y,i When the propagation path is not a direct path, f t,x,i f t,y,i These are functions for sending horizontal and vertical angles, for example... Where (cosα) t,i cosβ t,i cosγ t,i f is the direction cosine of the i-th path, where f is the direction cosine of the i-th path. t,x,i and f x,i Independent, f t,y,i and f y,i independent.

[0214] In addition, the aforementioned V i For the quantification of angle and b i The quantification of angles may differ, so f tsi =(f t,x,i f t，y,i ,f t,z,i ) and f si They may be different.

[0215] In some embodiments, the second node can notify the first node of the feedback b. i and V i Whether the same retrieved parameters are associated. When b i and V i When the same retrieved parameters are associated, b i and V i The parameters obtained include the same parameters; the same parameters fed back by the first node are used by the second node to determine b.i and V i .

[0216] And / or, the first node feedback b i and V i Does it involve the same retrieved parameters? When the first node returns b... i and V i When the same retrieved parameters are associated, b i and V i The parameters obtained include the same parameters, and the same parameters returned by the first node are used for b. i and V i The determination.

[0217] In some embodiments, V i It can be a vector with only one element valued at 1 and the other elements valued at 0. For example, the second node uses precoding to transmit the CSI-RS port, and each CSI-RS port is transmitted using a beam corresponding to a spatial basis vector.

[0218] The precoding V in Formula 9 above i This is the direction vector on a single polarization of the i-th AP, as shown in Equation 9, which illustrates an example where each AP extracts only one polarization direction. Furthermore, the antenna for each AP can also be a dual-polarized antenna. For example, the precoding vector corresponding to each layer satisfies the following Equation 14:

[0219] Indicates a dimension of N ant *P's precoding vector, d i1 d represents the weighting coefficient in the first polarization direction of the i-th CSI-RS resource. i2 V represents the weighting coefficient in the second polarization direction of the i-th CSI-RS resource. i The number of elements included is N = N ant / z, z = 2.

[0220] In the above formula, the spatial basis vector V of the two polarization directions of an AP i They are the same, the first time-domain basis vector w i (t) is the same, with the weighted value d. iq The values ​​i = 1, 2, ..., P and q = 1, 2 are different. Since the spatial and temporal vectors on the two polarizations are related to their spatial positions, and the spatial positions of the two polarization directions are the same, the spatial and temporal vectors corresponding to the two polarization directions are identical. The only difference between the two polarization directions is the projection of the electric field onto the two polarization directions, therefore the projection value d... iq different.

[0221] In some embodiments, Formula 14 above describes a scenario where the spatial transmission path between the first node and the second node is a single path. For a multipath scenario, where there are multiple paths between the first node and the second node, the precoding vector corresponding to each layer satisfies the following Formula 15:

[0222] Indicates a dimension of N ant *P is the precoding vector, Li represents the number of spatial vectors corresponding to the i-th CSI-RS resource, and d i1,j d represents the weighting coefficient of the j-th spatial vector in the first polarization direction corresponding to the i-th CSI-RS resource. i2,j This represents the weight coefficient of the j-th spatial vector in the second polarization direction corresponding to the i-th CSI-RS resource. V represents the first temporal basis vector of the j-th spatial vector corresponding to the i-th CSI-RS resource. i,j V represents the j-th spatial vector corresponding to the i-th CSI-RS resource. i,j The number of elements included is N = N ant / z, z = 2.

[0223] It should be understood that the antenna ordering in Formulas 14 and 15 above is as follows: first, the antenna index within a polarization is incremented, then the polarization is incremented, and finally the AP index is incremented. However, this disclosure does not limit the antenna ordering. For example, the above formulas can also be expressed as follows: first, the antenna index within a polarization is incremented, then the AP index is incremented, and finally the polarization is incremented. For example, Formula 14 above can be expressed as follows:

[0224] In formulas 14 and 16 above, d iq It can be replaced with d iq To represent a complex number, It is a conjugate symbol defined based on the signal transmission model and can be represented by a general complex number. d in Formula 15 iq,j It can also be replaced with

[0225] In some embodiments, since the arrival delays of each AP at (x0, y0, z0) are different, d iq d is a quantity that varies with the frequency domain. iq =d iq (k). k is the index of the frequency domain cell, such as the index of a sub-band. For example... k,n3∈{0,1,...,N3-1}. n3 is the index of the frequency domain vector, which can be fed back to the base station by the terminal, and N3 is the total number of frequency domain units. At this time, the precoding vector corresponding to each layer satisfies the following formula 17:

[0226] Indicates a dimension of N ant *P's precoding vector, c i1 c represents the weighting coefficient in the first polarization direction corresponding to the i-th CSI-RS resource. i2 This represents the weighting coefficient in the second polarization direction corresponding to the i-th CSI-RS resource. Let n represent the first frequency domain basis vector corresponding to the i-th CSI-RS resource, k represent the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and n represent the index of the first frequency domain cell corresponding to the first frequency domain basis vector. 3,i N3 represents the index of the first frequency domain basis vector corresponding to the i-th CSI-RS resource, and N3 represents the total number of first frequency domain units corresponding to the first frequency domain basis vector.

[0227] Each AP has its own first frequency domain basis vector. For example, the first frequency domain basis vector of the i-th AP is... Since propagation delay is only related to spatial location, the two polarizations are shared; the two polarizations are simply a weighted sum c. iq Different, c iq It is a weighted quantity that has both amplitude and phase, or a weighted quantity that has only phase.

[0228] The sorting in Formula 17 above is polarization first and then AP sorting. Alternatively, AP sorting can be done first and then polarization sorting. This disclosure does not limit the form of sorting and does not affect the essential features of precoding.

[0229] Formula 17 above applies to the case of a single diameter. Formulas 8-9 and 14-17 above... It can also be updated to The difference is only in the symbols used; there is no essential difference.

[0230] In some embodiments, b i ∈[0,1), for example, it can be quantized as Where n 4,i ,t∈{0,1,...,T-1}, where t is the time-domain cell index, n 4,i It can be reported from the terminal to the base station.

[0231] In some embodiments, for multipath cases, the precoding vector corresponding to each layer satisfies any one of the following formulas 18-20:

[0232] Indicates a dimension of N ant *P is the precoding vector, Li represents the number of spatial vectors corresponding to the i-th CSI-RS resource, and V j,i J represents the j-th spatial vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to multiple CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c iq,j,m,r w represents the weighting coefficient of the j-th spatial vector in the q-th polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to multiple CSI-RS resources.

[0233] Indicates a dimension of N ant *P's precoding vector, F i (k) represents the second frequency domain basis vector corresponding to the i-th CSI-RS resource, Li represents the number of spatial domain basis vectors corresponding to the i-th CSI-RS resource, and V j，i J represents the j-th spatial basis vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to multiple CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c i1，j，m,r w represents the weighting coefficient of the j-th spatial basis vector in the first polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to multiple CSI-RS resources.

[0234] Indicates a dimension of N ant *P's precoding vector, E i (t) represents the second time-domain basis vector corresponding to the i-th CSI-RS resource, F i (k) represents the second frequency domain basis vector corresponding to the i-th CSI-RS resource, Li represents the number of spatial domain basis vectors corresponding to the i-th CSI-RS resource, and V j,i J represents the j-th spatial basis vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to multiple CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c i1,j,m,rw represents the weighting coefficient of the j-th spatial basis vector in the first polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to multiple CSI-RS resources.

[0235] In the above formula, k,n 3,m ∈{0,1,...,N3-1}, N5=N3O3, where O3 is a positive integer. 5,i ∈{0,1,...,N5-1}. n 6,i ∈{0,1,...,T1-1},c iq,j,m,r It is a weighted quantity. n 4，r ∈{0,1,...,T-1}. T1=T*O4, where O4 is a positive integer.

[0236] It should be understood that multiple APs can share the time-domain basis vector space w. m (t) and frequency domain basis vector space J m (k), because after quantization, the frequency domain basis vector spaces of multiple APs may be the same, and the time domain basis vector spaces may also be the same, and can be obtained through c iq,j,m，r This method can achieve the purpose of selecting frequency domain basis vectors and time domain basis vectors. Compared with each AP feeding back the time domain basis vector space and / or frequency domain basis vector space separately, this method can save feedback overhead.

[0237] For Equation 19 above, a second frequency domain basis vector F is added to each AP based on Equation 18. i (k), F i (k) compared to J m (k) has a smaller granularity in terms of time delay. This can be understood as F i (k) compared to J m (k) corresponds to the same maximum delay length, F i (k) Divide this time length into N5 parts, J m (k) is divided into N3 parts, and N5 is greater than N3.

[0238] It can also be understood as F i (k) compared to J m (k) corresponds to a larger maximum delay. This is because the maximum delay is the reciprocal of the frequency domain interval, F. i The frequency domain spacing of (k) is smaller, so the corresponding maximum duration is larger.

[0239] For Equation 20 above, a second time-domain basis vector E is added to each AP based on Equation 19. i(t), E i (t) compared to w m (t) has smaller frequency domain discrimination and / or a larger corresponding Doppler spread.

[0240] It should be understood that the precoding described above applies to a single layer. When there are multiple layers, the precoding form for each layer conforms to the above form, except that some quantities may be independent of each layer. In this case, the layer index can be added to the subscript of the corresponding quantity. Some quantities are shared by layers, and in the above formula, the subscript of these quantities does not add the layer index. For example, in formula 20, the subscript of V can be... j，i E i (t), F i In (k), no layer index is added, and these quantities are shared across multiple layers. Layer indexes can be added to the subscripts of other quantities to indicate that these quantities are independent of each layer.

[0241] Furthermore, in some embodiments of this disclosure, based on the feedback of CSI-RS resource groups for each first group, the number of non-zero elements in the precoding vector of each first group can be obtained according to the CSI-RS resource group corresponding to each first group. The number of non-zero elements in the precoding vector is equal to the sum of the number of CSI-RS ports included in all CSI-RS resources in the selected CSI-RS resource group. In some embodiments of this disclosure, a temporal basis vector can also be introduced into the precoding vector obtained from the CSI-RS resource group corresponding to each first group, such as any one of the precoding forms in Formulas 9-20.

[0242] In some embodiments of this disclosure, at the same time as obtaining the CSI-RS resource group, at least one of the following corresponding to the CSI-RS resource group can be further reported: precoding information, CQI information, and RI information.

[0243] In some examples, the first node in this disclosure feeds back information about the selected CSI-RS resource group for each time-domain resource group, thereby enabling the feedback of AP selection information for each time-domain resource group.

[0244] A CSI-RS resource group includes one or more CSI-RS resources. The first node can feed back different AP selections for different time-domain resource groups. In this case, the precoding vector in the fed-back CSI-RS resource group information can include the aforementioned time-domain basis vectors and / or frequency-domain basis vectors, or it can omit the aforementioned time-domain basis vectors and / or frequency-domain basis vectors. Taking the omission of the aforementioned time-domain basis vectors and / or frequency-domain basis vectors as an example, the precoding vector corresponding to the time-domain resource group satisfies the following formulas 21-23:

[0245] The parameters in Formulas 21-23 can be referred to in the above embodiments. At this time, in some time-domain resource groups, the precoding vectors corresponding to some APs in the precoding vector are configured as 0, indicating that at the spatial location corresponding to this time-domain resource group, the Doppler components of this AP and other APs cannot be positively superimposed. Therefore, it is possible to prevent this AP and other APs from sending the same signal to the terminal at the same time.

[0246] For example, on the time-domain resources of time-domain resource group 1, the precoding vector is shown in Equation 21, where P APs are selected. On the time-domain resources of time-domain resource group 2, the precoding vector is shown in Equation 22, which prevents AP2 from being selected. Furthermore, the precoding vector may not include the precoding vectors of the unselected APs, as shown in Equation 23. Equation 23 is the vector obtained by removing elements with a value of 0 from Equation 22. In this case, the dimensionality of the precoding vector is reduced, for example, from N*P dimensions to N*(P-1) dimensions, where N is the number of antennas per AP and P is the number of APs. Equations 22 and 23 are essentially the same, only differing in their representation.

[0247] For example, referring to the example shown in Figure 4, Figure 4 includes two time-domain resource groups. For times with CSI-RS transmission, the first time-domain resource group includes times 1, 3, and 5, and the second time-domain resource group includes times 2, 4, and 6. For predicted times, the first time-domain resource group includes times 7, 9, and 11, and the second time-domain resource group includes times 8, 10, and 12. Each time-domain resource group in Figure 4 includes multiple non-contiguous time units (i.e., times). This embodiment does not exclude the possibility that each time-domain resource group may only include one or more consecutive time units.

[0248] At each time point, the channel measurement results of each of the P APs can be obtained. Taking P=3 as an example, the first node reports to the second node through measurement. In time domain resource group 1, the same data can be sent to the first node by {AP1, AP2, AP3}, and in time domain resource group 2, the same data can be sent to the first node by {AP1, AP3}.

[0249] In time-domain resource group 2, AP1, AP2, and AP3 sending data to the first node together would cause deep attenuation; therefore, AP2 does not participate in data transmission to the first node. In time-domain resource groups 1 and 2, AP1 and AP3 share precoding information, but CQI and RI are fed back separately for each time-domain resource group. Alternatively, for the same AP, if it is selected by multiple time-domain resource groups, at least the spatial basis vector and frequency basis vector in the precoding information are shared across multiple time-domain resource groups, while the time-domain basis vector and weighting value can be fed back separately for each time-domain resource group. Alternatively, in the precoding information, at least the spatial basis vector, frequency basis vector, and time basis vector are shared across multiple time-domain resource groups, while the weighting value can be fed back separately for each time-domain resource group. Each AP can be represented by a CSI-RS resource, and a CSI-RS resource includes one or more CSI-RS ports. For example, if a CSI-RS resource is selected by multiple time-domain resource groups, then some or all of the precoding information of that CSI-RS resource is shared across the multiple time-domain resource groups. As shown in Formulas 21 and 22 above, the precoding information corresponding to CSI-RS resource 1 remains unchanged across two time-domain resource groups. On each time-domain resource group, the first node feeds back either CQI or CQI and RI. When only CQI is fed back, the number of layers on each time-domain resource is the same. When both CQI and RI are fed back, the corresponding number of layers on each time-domain resource is different.

[0250] For each time-domain resource group, the first node feeds back the selected CSI-RS resource group. The number of non-zero elements in the precoding vector of each time-domain resource in each time-domain resource group is determined based on the CSI-RS resources included in the selected CSI-RS resource group. For example, the number of non-zero elements in the precoding vector of time-domain resource group 1 is N. ant *3, The number of non-zero elements in the precoding vector on temporal resource group 2 is N. ant *2. At this point, it is assumed that each CSI-RS resource includes the same number of CSI-RS ports (some embodiments of this disclosure are also applicable to cases where different CSI-RS resources include different numbers of CSI-RS ports). In this case, the number of non-zero elements in the precoding vector is the sum of the number of CSI-RS ports included in the selected CSI-RS resources.

[0251] In some embodiments, the precoding vector is a weighted combination vector of multiple precoding vectors. This precoding vector may correspond to one or more CSI-RS resources, that is, a CSI-RS resource group includes one or more CSI-RS resources. The following scheme flexibly divides the number of ports included in one or more CSI-RS resources into multiple subgroups, each subgroup corresponding to a subvector in the precoding vector.

[0252] The number of subvectors Pj included in each precoding vector is determined separately, that is, Pj is determined according to the precoding vector index j.

[0253] In some embodiments, the number of subvectors is obtained according to at least one of the following:

[0254] Signaling from the second node;

[0255] The layer index corresponding to the precoding vector;

[0256] The layer group index corresponding to the precoding vector;

[0257] Number of antenna ports N ant ;

[0258] The number of antenna ports on a single polarization; or,

[0259] Index of spatial basis vectors.

[0260] A precoding vector consists of z*Pj subvectors, which are divided into Pj subvector groups. Each subvector group contains z subvectors, and the z subvectors in the same subvector group are related to each other. For example, when the AP's antenna is single-polarized, z = 1; when the AP's antenna is dual-polarized, z = 2.

[0261] In some embodiments, Pj sub-vector groups correspond to Pj sets of parameters, and each sub-vector in the Pj sub-vector groups corresponds to a set of parameters in the Pj sets of parameters. For example, each set of parameters in the Pj sets of parameters includes at least parameters related to spatial vectors, such as V in formulas 9, 14, 16, and 17. i For example, V in formulas 15 and 18-23 j,i , i = 1, 2, ..., P.

[0262] In some embodiments, the precoding vector satisfies the following formulas 24, 26, or 27:

[0263] The following formula 25 is satisfied:

[0264] The value of P can be determined for different spatial vector indices j; for example, Pj can be different for different j or different groups of j. In some embodiments, b in formula 25 i =0. i = 1, 2...Pj.

[0265] The following formula 28 is satisfied:

[0266] The parameters are as described in the above embodiments and will not be repeated here. ij a j Represents a complex number. The number of sub-vectors Pj corresponding to different spatial domain vector indices is different, while each spatial domain vector includes the same number of elements, i.e., N. ant,0 *P0=N ant,j *Pj.

[0267] In formulas 24-28 above, the sub-vector V corresponds to different j. j,i The number of elements included, N ant,j They can be different or the same. In some embodiments, for a j, the various subvectors V j，i Let i = 1, 2, ..., Pj contain the same number of elements. In some embodiments, for a j, each subvector V j，i The number of elements contained in Pj is different for i = 1, 2, ..., Pj.

[0268] The precoding vector described above is a weighted combination of multiple precoding vectors. The number of sub-vectors is determined by at least one of the following: signaling from the second node, the layer index corresponding to the precoding vector, the layer group index corresponding to the precoding vector, and the number of antenna ports N. ant The number of antenna ports on a polarization, or the index of the spatial basis vector, and the flexible schemes for determining the number of sub-vectors using formulas 24-28, can not only solve the problem of deep spatial attenuation but also adapt to the near-field and far-field problems in large-scale centralized MIMO antenna communication. Different distances between the first node or scatterer and the second node antenna require different sub-vector numbering schemes; the closer the first node or scatterer is to the second node antenna, the more sub-vectors are needed. The signal transmitted by the second node reaches the first node through scatterers. Each scatterer corresponds to one or more paths in a multipath, thus requiring a flexible sub-vector determination scheme. For example, for different layers or layer groups, the spatial vector may correspond to scatterers located at different positions, so the number of sub-vectors needs to be determined separately for different layers or layer groups. Moreover, the number of antennas and the near-field region of the second node also affect the number of sub-vectors; the more antennas, the more sub-vectors are needed.

[0269] It should be understood that in scenarios where multiple APs simultaneously transmit data to the first node, the significant differences in the spatial frequency domain of the spatial beams of the multiple APs lead to the spatial deep fading problem shown in Figure 1. Therefore, this disclosure provides the above-mentioned embodiments, which can select different CSI-RS resource groups for different first groups, thereby solving the spatial deep fading problem; they can also determine the first predetermined characteristics that the CSI-RS resource group must satisfy during the distributed beam training phase or the CSI-RS resource selection phase, thus determining the CSI-RS resource group and solving the spatial deep fading problem, in which case different CSI-RS resources can be transmitted by different APs or beams; they can also provide different channel state information for different first groups for the same CSI-RS resource, in which case one CSI-RS resource can be transmitted by multiple APs or multiple beams; they can also solve the spatial deep fading problem of multiple APs by introducing time-domain basis vectors from the perspective of precoding vectors; they can also solve the spatial deep fading problem by flexibly determining the number of sub-vectors included in the precoding vector. The above embodiments can be used in combination to better solve the spatial deep fading problem, or they can be used independently to reduce the complexity of the first node and feedback overhead. In summary, this disclosure, based on the discovery of the spatial deep decay problem, provides various solutions to address different spatial deep decay issues, particularly those occurring within the same layer in multipath transmissions, and is applicable to scenarios with significant angular spread in multipath transmissions, such as when multiple paths originate from multiple nodes. Here, spatial deep decay can also be referred to as temporal deep decay.

[0270] Figure 8 is a flowchart of another channel information feedback method according to some embodiments. As shown in Figure 8, the method includes the following steps 801:

[0271] In step 801, information related to X CSI-RS resource groups from the first node is received.

[0272] X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0273] It should be noted that the above-described first node-related embodiments can also be applied to the second node side. The embodiments on the second node side can refer to the above-described first node, for example, the same or similar steps, descriptions and limitations of the same or similar features, which will not be repeated in this disclosure.

[0274] It is understood that, in order to achieve the above-mentioned functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the algorithmic steps of the examples described in conjunction with the embodiments of this disclosure, this disclosure can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0275] Some embodiments of this disclosure can divide the communication device into functional modules according to the above method embodiments. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one functional module. The integrated module can be implemented in hardware or software. It should be noted that the module division in some embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. The following description uses the example of dividing each functional module according to each function.

[0276] For example, taking a communication device as the first node in the above method embodiment as an example, Figure 9 is a structural diagram of a first node according to some embodiments. The first node can execute the channel information feedback method provided in the above method embodiment. As shown in Figure 9, the first node 90 includes: a processing unit 901 and a communication unit 902.

[0277] The processing unit 901 is used to determine X Channel State Information Reference Signal (CSI-RS) resource groups, where X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0278] The communication unit 902 is used to send information about X CSI-RS resource groups to the second node.

[0279] For example, taking a communication device as the second node in the above method embodiment, Figure 10 is a structural diagram of a second node according to some embodiments. The second node can execute the channel information feedback method provided in the above method embodiment. As shown in Figure 10, the second node 100 includes: a communication unit 1001.

[0280] The communication unit 1001 is used to receive information about X CSI-RS resource groups from the first node; X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

[0281] It should be noted that all relevant content of each step involved in the above method embodiments can be applied to the functional description of the corresponding functional modules of the first node and the second node, and will not be repeated here.

[0282] In the case of implementing the functions of the integrated modules described above in hardware, some embodiments of this disclosure provide another possible structure for the communication device involved in the above embodiments. As shown in FIG11, the communication device 110 includes a processor 1102 and a bus 1104. In some embodiments, the communication device 110 may further include a memory 1101. In some embodiments, the communication device 110 may further include a communication interface 1103.

[0283] Processor 1102 may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with some embodiments of this disclosure. Processor 1102 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. Processor 1102 may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with some embodiments of this disclosure. Processor 1102 may also be a combination of functions implementing computation. For example, processor 1102 may include one or more microprocessor combinations, combinations of digital signal processors (DSPs) and microprocessors, etc.

[0284] Communication interface 1103 is used to connect with other devices via a communication network. This communication network can be Ethernet, wireless access network, or wireless local area network (WLAN).

[0285] The memory 1101 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but this disclosure is not limited thereto.

[0286] In some embodiments, the memory 1101 may exist independently of the processor 1102. The memory 1101 may be connected to the processor 1102 via a bus 1104 and is used to store instructions or program code. When the processor 1102 calls and executes the instructions or program code stored in the memory 1101, it can implement the method described in any embodiment of this disclosure.

[0287] In some embodiments, the memory 1101 may also be integrated with the processor 1102.

[0288] Bus 1104 can be an Extended Industry Standard Architecture (EISA) bus. Bus 1104 can be divided into an address bus, a data bus, and a control bus. For ease of illustration, only one thick line is used to represent it in Figure 11, but this does not mean that there is only one bus or one type of bus.

[0289] Some embodiments of this disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) storing computer program instructions that, when executed on a computer, cause the computer to perform the methods described in any of the above embodiments.

[0290] For example, the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs)), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROMs), cards, sticks, or key drives). The various computer-readable storage media described in this disclosure may represent one or more devices for storing information and / or other machine-readable storage media. The term "machine-readable storage media" may include, but is not limited to: wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0291] This disclosure provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods described in any of the above embodiments.

[0292] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions within the technical scope disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A channel information feedback method, applied to a first node, the method comprising: X Channel State Information Reference Signal (CSI-RS) resource groups are determined, where X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources; Send the relevant information of the X CSI-RS resource groups to the second node.

2. The method of claim 1, wherein, When X is greater than 1, the X CSI-RS resource groups each correspond to X first groups, and the X first groups are at least one of the following: X time-domain resource groups, wherein each of the X time-domain resource groups includes one or more time-domain units; X time-domain layer resource groups, wherein one of the X time-domain layer resource groups includes one or more time-domain layer resources, and each of the one or more time-domain layer resources is a data layer group on a time-domain resource; X layer groups, wherein each of the X layer groups includes one or more data layers; X frequency domain resource groups, wherein each of the X frequency domain resource groups includes one or more frequency domain elements; There are X time-frequency resource groups, wherein each resource in the X time-frequency resource groups is a time-frequency resource; X frequency domain layer resource groups, wherein one of the X frequency domain layer resource groups includes one or more frequency domain layer resources, and each of the one or more frequency domain layer resources is a data layer group on a frequency domain resource; There are X time-frequency domain layer resource groups, wherein one of the X time-frequency domain layer resource groups includes one or more time-frequency layer resources, and each of the one or more time-frequency layer resources is a data layer group on a time-frequency domain resource.

3. The method according to claim 2, wherein, The relevant information for the X CSI-RS resource groups includes the division method of the X first groups; and / or, The division method of the X first groups is determined based on the received signaling information.

4. The method according to claim 2, wherein, At least one of the X time-domain resource groups includes time-discontinuous time-domain resources; and / or, The X CSI-RS resource groups corresponding to the X first groups include: the channel state information on each of the X first groups is determined based on one of the X CSI-RS resource groups; wherein, there is a correspondence between the one CSI-RS resource group and the first group; and / or, The relevant information of the X CSI-RS resource groups includes the channel state information of each CSI-RS resource group. The channel state information of one of the X CSI-RS resource groups is adapted to one of the X first groups, wherein there is a correspondence between the one CSI-RS resource group and the one first group.

5. The method of claim 2, wherein, One of the X time-domain resource groups includes a time-domain unit comprising the CSI-RS signal of each CSI-RS resource in the corresponding CSI-RS resource group of the time-domain resource group, or... One of the X time-domain resource groups includes one or more time-domain units that are time-domain units after a predetermined time, wherein the predetermined time is determined based on the transmission time of the first node when transmitting the relevant information of the X CSI-RS resource groups.

6. The method of claim 2, wherein, When a CSI-RS resource belongs to at least two of the X CSI-RS resource groups, all or part of the information of the precoded information corresponding to the CSI-RS resource is the same in at least two first groups corresponding to the at least two CSI-RS resource groups.

7. The method according to claim 1, wherein, The channel state of at least one of the X CSI-RS resource groups satisfies a first predetermined characteristic; and / or, The X CSI-RS resource groups are determined based on the first predetermined feature that the channel state of each CSI-RS resource group needs to satisfy.

8. The method of claim 7, wherein, Each CSI-RS resource group in the at least one CSI-RS resource group includes at least two CSI-RS resources, and the channel state of each CSI-RS resource group in the at least one CSI-RS resource group satisfies the first predetermined characteristic including at least one of the following: The CSI-RS resources in the CSI-RS resource group can be received simultaneously by the first node; The channel measurement values ​​of the CSI-RS resources in the CSI-RS resource group satisfy the second predetermined characteristic; The CSI-RS resources in the CSI-RS resource group correspond to the same data layer; or, The CSI-RS resources in the CSI-RS resource group correspond to different data layers.

9. The method of claim 8, wherein, The channel measurement value includes at least one of the following: The measurements include: delay spread, angle spread, Doppler spread, frequency domain variation of the packet channel corresponding to the CSI-RS resource group, time domain variation of the packet channel corresponding to the CSI-RS resource group, frequency domain variation of the channel quality of the packet channel, and time domain variation of the channel quality of the packet channel.

10. The method of claim 9, wherein, When the channel measurement includes at least one of the delay spread measurement, the angle spread measurement, and the Doppler spread measurement, the channel measurement of the CSI-RS resources in the CSI-RS resource group satisfies the second predetermined characteristic, including: The channel measurement values ​​of any two CSI-RS resources in the CSI-RS resource group are less than a predetermined value; and / or The distribution of the channel measurements of all CSI-RS resources in the CSI-RS resource group satisfies the second predetermined characteristic.

11. The method according to claim 9, wherein, The grouped channel is a channel obtained by using the ports of different CSI-RS resources in the CSI-RS resource group as different measurement ports; and / or, The grouped channel is the sum of channels obtained from the ports of different CSI-RS resources in the CSI-RS resource group.

12. The method of any of claims 1-11, wherein, The relevant information of the X CSI-RS resource groups includes information about each CSI-RS resource group within the X CSI-RS resource groups, wherein the information about each CSI-RS resource group includes at least one of the following: The index information of the CSI-RS resources included in each CSI-RS resource group; Each CSI-RS resource group includes channel quality information for each CSI-RS resource; Channel quality information of the packet channel corresponding to each CSI-RS resource group; The channel measurement values ​​for each CSI-RS resource group; The precoding information corresponding to each CSI-RS resource group; or, The rank information corresponding to each CSI-RS resource group.

13. The method of claim 12, wherein, The channel quality information includes at least one of the following: Reference Signal Receiving Power (RSRP), Signal to Interference Plus Noise Ratio (SINR), and Channel Quality Indicator (CQI).

14. The method of any of claims 1-13, wherein, The relevant information of the X CSI-RS resource groups includes the precoding information corresponding to each of the X CSI-RS resource groups; Wherein, the precoding vector corresponding to each layer in the precoding information of one of the X CSI-RS resource groups includes z*P sub-vectors, and the number of elements in the precoding vector is equal to the sum of the number of elements in the z*P sub-vectors; P is the number of CSI-RS resources included in the CSI-RS resource group, and z is a positive integer less than or equal to 3; for the P CSI-RS resources in the CSI-RS resource group, each CSI-RS resource corresponds to z sub-vectors in the z*P sub-vectors; the number P of CSI-RS resources included in different CSI-RS resource groups in the X CSI-RS resource groups may be the same or different.

15. The method of claim 14, wherein, The z sub-vectors are determined by one or more parameters; the one or more parameters include at least one of the following: one or more first time-domain basis vectors, one or more first frequency-domain basis vectors; In this context, each element in a first time-domain basis vector corresponds to a first time-domain unit, and each element in a first frequency-domain basis vector corresponds to a first frequency-domain unit.

16. The method of claim 15, wherein, The one or more parameters further include at least one of a second time-domain basis vector and a second frequency-domain basis vector; The second time-domain basis vector is used to characterize the deviation of the channel state in the time domain for different CSI-RS resources; The second frequency domain basis vector is used to characterize the deviation of the channel state of different CSI-RS resources in the frequency domain.

17. The method of claim 14, wherein, The precoding vector corresponding to each layer satisfies at least one of the following forms: wherein, represents a dimension of N ant a precoding vector of P, z = 1, N ant represents a number of antenna ports included in one of the CSI-RS resources, d i represents a weight coefficient corresponding to the i-th CSI-RS resource, denotes the first time domain basis vector corresponding to the i-th CSI-RS resource, b i ∈ [0, 1], V i denotes the spatial domain vector corresponding to the i-th CSI-RS resource, V i includes N = N ant / z; wherein, represents the dimension of N ant a precoding vector of P, d i1 represents the weight coefficient in the first polarization direction of the i-th CSI-RS resource, d i2 represents the weight coefficient in the second polarization direction of the i-th CSI-RS resource, V i The number of elements included in N = N ant / z, z = 2; wherein, represents the dimension of N ant P is a precoding vector, Li represents the number of spatial domain vectors corresponding to the i-th CSI-RS resource, d i1,j represents the weight coefficient of the j-th spatial domain vector in the first polarization direction corresponding to the i-th CSI-RS resource, d i2,j represents the weight coefficient of the j-th spatial domain vector in the second polarization direction corresponding to the i-th CSI-RS resource, V represents the first time domain basis vector corresponding to the jth spatial domain vector of the ith CSI-RS resource i,j V represents the jth spatial domain vector corresponding to the ith CSI-RS resource i,j The number of elements included in N = N ant / z, z = 2; wherein, represents a dimension of N ant a precoding vector of P, c i1 represents a weight coefficient in a first polarization direction corresponding to the i-th CSI-RS resource, c i2 represents a weight coefficient in a second polarization direction corresponding to the i-th CSI-RS resource, represents a first frequency domain basis vector corresponding to the i-th CSI-RS resource, k represents an index of a first frequency domain unit corresponding to the first frequency domain basis vector, n 3,i represents an index of a first frequency domain basis vector corresponding to the i-th CSI-RS resource, N3represents a total number of first frequency domain units corresponding to the first frequency domain basis vector; wherein Indicates a dimension of N ant *P is the precoding vector, Li represents the number of spatial vectors corresponding to the i-th CSI-RS resource, and V j,i J represents the j-th spatial vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to the plurality of CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c iq,j,m,r w represents the weighting coefficient of the j-th spatial vector in the q-th polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to the plurality of CSI-RS resources; wherein Indicates a dimension of N ant *P's precoding vector, F i (k) represents the second frequency domain basis vector corresponding to the i-th CSI-RS resource, Li represents the number of spatial domain basis vectors corresponding to the i-th CSI-RS resource, and V j,i J represents the j-th spatial basis vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to the plurality of CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c i1,j,m,r w represents the weighting coefficient of the j-th spatial basis vector in the first polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to the plurality of CSI-RS resources; wherein, Indicates a dimension of N ant *P's precoding vector, E i (t) represents the second time-domain basis vector corresponding to the i-th CSI-RS resource, F i (k) represents the second frequency domain basis vector corresponding to the i-th CSI-RS resource, Li represents the number of spatial domain basis vectors corresponding to the i-th CSI-RS resource, and V j,i J represents the j-th spatial basis vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to the plurality of CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c i1,j,m,r w represents the weighting coefficient of the j-th spatial basis vector in the first polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to the plurality of CSI-RS resources; or, where the jthspatial vector is comprises z*Pj sub-vectors d iq *V j,1 , z = 2, d iq,j denotes the weight corresponding to the q-th polarization direction of the 2(i-1)+q-th sub-vector of the j-th spatial vector, V j,i are the spatial sub-vectors corresponding to the 2(i-1)+1 and 2(i-1)+2-th sub-vectors of the j-th spatial vector, V j,i comprises N ant,j elements, Pj being determined according to the spatial vector index j.

18. The method of claim 17, wherein, When the precoding information corresponding to a CSI-RS resource group includes precoding vectors for multiple layers, the precoding vectors corresponding to different layers among the multiple layers have the same precoding form, and at least one parameter in the precoding vectors corresponding to different layers among the multiple layers has a different value.

19. The method of claim 1, wherein, At least one of the X CSI-RS resource groups exists, and each of the at least one CSI-RS resource group includes one CSI-RS resource. The relevant information of the X CSI-RS resource groups includes at least one of the following: Multiple channel state information of a CSI-RS resource in each of the at least one CSI-RS resource groups, wherein the multiple channel state information corresponds to multiple first groups; The channel quality information of the CSI-RS resource in each of the at least one CSI-RS resource groups varies across the plurality of first groups; The plurality of first groups include at least one of the following: a plurality of time-domain resource groups, a plurality of frequency-domain resource groups, and a plurality of time-frequency resource groups; the channel state information includes at least one of the following: precoding information and channel quality information; the channel quality information includes at least one of the following: RSRP, SINR, and Reference Signal Receiving Quality (RSRQ).

20. The method of claim 19, wherein, Each of the at least one CSI-RS resource groups includes one CSI-RS resource corresponding to multiple sets of quasi-co-located reference signal configuration information.

21. The method according to any one of claims 1-18, wherein, One of the X CSI-RS resource groups: Each of the multiple CSI-RS resources in the CSI-RS resource group corresponds to a quasi-co-located reference signal configuration information.

22. The method according to any one of claims 1-21, wherein, The relevant information of the X CSI-RS resource groups is contained in a single reporting message, which is reported at least once in a channel and / or a time domain unit; and / or, The relevant information of the X CSI-RS resource groups is associated with the same predetermined channel state information.

23. A channel information feedback method, applied to a second node, the method comprising: Receive relevant information from X CSI-RS resource groups from the first node; where X is a positive integer greater than or equal to 1, and each of the X CSI-RS resource groups includes one or more CSI-RS resources.

24. The method of claim 23, wherein, When X is greater than 1, the X CSI-RS resource groups each correspond to X first groups, and the X first groups are at least one of the following: X time-domain resource groups, wherein each of the X time-domain resource groups includes one or more time-domain units; X time-domain layer resource groups, wherein one of the X time-domain layer resource groups includes one or more time-domain layer resources, and each of the one or more time-domain layer resources is a data layer group on a time-domain resource; X layer groups, wherein each of the X layer groups includes one or more data layers; X frequency domain resource groups, wherein each of the X frequency domain resource groups includes one or more frequency domain elements; There are X time-frequency resource groups, wherein each resource in the X time-frequency resource groups is a time-frequency resource; X frequency domain layer resource groups, wherein one of the X frequency domain layer resource groups includes one or more frequency domain layer resources, and each of the one or more frequency domain layer resources is a data layer group on a frequency domain resource; There are X time-frequency domain layer resource groups, wherein one of the X time-frequency domain layer resource groups includes one or more time-frequency layer resources, and each of the one or more time-frequency layer resources is a data layer group on a time-frequency domain resource.

25. The method according to claim 24, wherein, The relevant information for the X CSI-RS resource groups includes the division method of the X first groups; and / or, The division method of the X first groups is indicated by the sent signaling information.

26. The method according to claim 24, wherein, At least one of the X time-domain resource groups includes time-discontinuous time-domain resources; and / or, The X CSI-RS resource groups corresponding to the X first groups include: the channel state information on each of the X first groups is determined based on one of the X CSI-RS resource groups; wherein, there is a correspondence between the one CSI-RS resource group and the first group; and / or, The relevant information of the X CSI-RS resource groups includes the channel state information of each CSI-RS resource group. The channel state information of one of the X CSI-RS resource groups is adapted to one of the X first groups, wherein there is a correspondence between the one CSI-RS resource group and the one first group.

27. The method of claim 24, wherein, One of the X time-domain resource groups includes a time-domain unit comprising the CSI-RS signal of each CSI-RS resource in the corresponding CSI-RS resource group of the time-domain resource group, or... One of the X time-domain resource groups includes one or more time-domain units that are time-domain units after a predetermined time, wherein the predetermined time is determined based on the transmission time of the first node when transmitting the relevant information of the X CSI-RS resource groups.

28. The method of claim 24, wherein, When a CSI-RS resource belongs to at least two of the X CSI-RS resource groups, all or part of the information of the precoded information corresponding to the CSI-RS resource is the same in at least two first groups corresponding to the at least two CSI-RS resource groups.

29. The method according to claim 23, wherein, The channel state of at least one of the X CSI-RS resource groups satisfies a first predetermined characteristic; and / or, The X CSI-RS resource groups are determined based on the first predetermined feature that the channel state of each CSI-RS resource group needs to satisfy.

30. The method of claim 29, wherein, Each CSI-RS resource group in the at least one CSI-RS resource group includes at least two CSI-RS resources, and the channel state of each CSI-RS resource group in the at least one CSI-RS resource group satisfies the first predetermined characteristic including at least one of the following: The CSI-RS resources in the CSI-RS resource group can be received simultaneously by the first node; The channel measurement values ​​of the CSI-RS resources in the CSI-RS resource group satisfy the second predetermined characteristic; The CSI-RS resources in the CSI-RS resource group correspond to the same data layer; or, The CSI-RS resources in the CSI-RS resource group correspond to different data layers.

31. The method of claim 30, wherein, The channel measurement value includes at least one of the following: The measurements include: delay spread, angle spread, Doppler spread, frequency domain variation of the packet channel corresponding to the CSI-RS resource group, time domain variation of the packet channel corresponding to the CSI-RS resource group, frequency domain variation of the channel quality of the packet channel, and time domain variation of the channel quality of the packet channel.

32. The method of claim 31, wherein, When the channel measurement includes at least one of the delay spread measurement, the angle spread measurement, and the Doppler spread measurement, the channel measurement of the CSI-RS resources in the CSI-RS resource group satisfies the second predetermined characteristic, including: The channel measurement values ​​of any two CSI-RS resources in the CSI-RS resource group are less than a predetermined value; and / or The distribution of the channel measurements of all CSI-RS resources in the CSI-RS resource group satisfies the second predetermined characteristic.

33. The method according to claim 31, wherein, The grouped channel is a channel obtained by using the ports of different CSI-RS resources in the CSI-RS resource group as different measurement ports; and / or, The grouped channel is the sum of channels obtained from the ports of different CSI-RS resources in the CSI-RS resource group.

34. The method of any one of claims 23-33, wherein, The relevant information of the X CSI-RS resource groups includes information about each CSI-RS resource group within the X CSI-RS resource groups, wherein the information about each CSI-RS resource group includes at least one of the following: The index information of the CSI-RS resources included in each CSI-RS resource group; Each CSI-RS resource group includes channel quality information for each CSI-RS resource; Channel quality information of the packet channel corresponding to each CSI-RS resource group; The channel measurement values ​​for each CSI-RS resource group; The precoding information corresponding to each CSI-RS resource group; or, The rank information corresponding to each CSI-RS resource group.

35. The method of claim 34, wherein, The channel quality information includes at least one of the following: RSRP, SINR, and CQI.

36. The method of any one of claims 23-35, wherein, The relevant information of the X CSI-RS resource groups includes the precoding information corresponding to each of the X CSI-RS resource groups; Wherein, the precoding vector corresponding to each layer in the precoding information of one of the X CSI-RS resource groups includes z*P sub-vectors, and the number of elements in the precoding vector is equal to the sum of the number of elements in the z*P sub-vectors; P is the number of CSI-RS resources included in the CSI-RS resource group, and z is a positive integer less than or equal to 3; for the P CSI-RS resources in the CSI-RS resource group, each CSI-RS resource corresponds to z sub-vectors in the z*P sub-vectors; the number P of CSI-RS resources included in different CSI-RS resource groups in the X CSI-RS resource groups may be the same or different.

37. The method of claim 36, wherein, The z sub-vectors are determined by one or more parameters; the one or more parameters include at least one of the following: one or more first time-domain basis vectors, one or more first frequency-domain basis vectors; In this context, each element in a first time-domain basis vector corresponds to a first time-domain unit, and each element in a first frequency-domain basis vector corresponds to a first frequency-domain unit.

38. The method of claim 37, wherein, The one or more parameters further include at least one of a second time-domain basis vector and a second frequency-domain basis vector; The second time-domain basis vector is used to characterize the deviation of the channel state in the time domain for different CSI-RS resources; The second frequency domain basis vector is used to characterize the deviation of the channel state of different CSI-RS resources in the frequency domain.

39. The method of claim 36, wherein, The precoding vector corresponding to each layer satisfies at least one of the following forms: wherein represents a dimension of N ant a precoding vector of P, z = 1, N ant represents a number of antenna ports included in one of the CSI-RS resources, d i represents a weight coefficient corresponding to the i-th CSI-RS resource, denotes the first time domain basis vector corresponding to the i-th CSI-RS resource, b i ∈ [0, 1], V i denotes the spatial domain vector corresponding to the i-th CSI-RS resource, V i The number of elements included in is N = N ant / z; wherein, represents a dimension of N ant a precoding vector of P, d i1 represents a weight coefficient in a first polarization direction of the i-th CSI-RS resource, d i2 represents a weight coefficient in a second polarization direction of the i-th CSI-RS resource, V i The number of elements included in N = N ant / z, z = 2; wherein, N ant P the precoding vector, Li the number of spatial domain vectors corresponding to the i-th CSI-RS resource, d i1,j denotes the weight coefficient of the j-th spatial domain vector in the first polarization direction corresponding to the i-th CSI-RS resource, d i2,j denotes the weight coefficient of the j-th spatial domain vector in the second polarization direction corresponding to the i-th CSI-RS resource, V represents a first time-domain basis vector of a jth spatial domain vector corresponding to an ith CSI-RS resource i,j V represents a jth spatial domain vector corresponding to an ith CSI-RS resource i,j The number of included elements N = N ant / z, z = 2; wherein represents a dimension of N ant a precoding vector of P, c i1 represents a weight coefficient in a first polarization direction corresponding to the i-th CSI-RS resource, c i2 represents a weight coefficient in a second polarization direction corresponding to the i-th CSI-RS resource, represents a first frequency domain basis vector corresponding to the i-th CSI-RS resource, k represents an index of a first frequency domain unit corresponding to the first frequency domain basis vector, n 3,i represents an index of a first frequency domain basis vector corresponding to the i-th CSI-RS resource, N3represents a total number of first frequency domain units corresponding to the first frequency domain basis vector; wherein Indicates a dimension of N ant *P is the precoding vector, Li represents the number of spatial vectors corresponding to the i-th CSI-RS resource, and V i,j J represents the j-th spatial vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to the plurality of CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c iq,j,m,r w represents the weighting coefficient of the j-th spatial vector in the q-th polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to multiple CSI-RS resources; wherein Indicates a dimension of N ant *P's precoding vector, F i (k) represents the second frequency domain basis vector corresponding to the i-th CSI-RS resource, Li represents the number of spatial domain basis vectors corresponding to the i-th CSI-RS resource, and V i,j J represents the j-th spatial basis vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to the plurality of CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c i1,j,m,r w represents the weighting coefficient of the j-th spatial basis vector in the first polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to the plurality of CSI-RS resources; wherein Indicates a dimension of N ant *P's precoding vector, E i (t) represents the second time-domain basis vector corresponding to the i-th CSI-RS resource, F i (k) represents the second frequency domain basis vector corresponding to the i-th CSI-RS resource, Li represents the number of spatial domain basis vectors corresponding to the i-th CSI-RS resource, and V i,j J represents the j-th spatial basis vector corresponding to the i-th CSI-RS resource. m (k) represents the m-th first frequency domain basis vector corresponding to the plurality of CSI-RS resources, where k represents the index of the first frequency domain cell corresponding to the first frequency domain basis vector, and c i1,j,m,r w represents the weighting coefficient of the j-th spatial basis vector in the first polarization direction corresponding to the i-th CSI-RS resource, the m-th first frequency domain basis vector, and the r-th first time domain basis vector. r (t) represents the r-th first time-domain basis vector corresponding to the plurality of CSI-RS resources; or, where the jthspatial vector is comprises z*Pj sub-vectors d iq *V j,1 , z = 2, d iq,j denotes the weight corresponding to the q-th polarization direction of the 2(i-1)+q-th sub-vector of the j-th spatial vector, V j,i are the spatial sub-vectors corresponding to the 2(i-1)+1-th and 2(i-1)+2-th sub-vectors of the j-th spatial vector, V j,i comprises N ant,j elements, Pj being determined according to the spatial vector index j.

40. The method of claim 39, wherein, When the precoding information corresponding to a CSI-RS resource group includes precoding vectors for multiple layers, the precoding vectors corresponding to different layers among the multiple layers have the same precoding form, and at least one parameter in the precoding vectors corresponding to different layers among the multiple layers has a different value.

41. The method of claim 23, wherein, At least one of the X CSI-RS resource groups exists, and each of the at least one CSI-RS resource group includes one CSI-RS resource. The relevant information of the X CSI-RS groups includes at least one of the following: Multiple channel state information of a CSI-RS resource in each of the at least one CSI-RS resource groups, wherein the multiple channel state information corresponds to multiple first groups; The channel quality information of the CSI-RS resource in each of the at least one CSI-RS resource groups varies across the plurality of first groups; The plurality of first groups include at least one of the following: a plurality of time-domain resource groups, a plurality of frequency-domain resource groups, and a plurality of time-frequency resource groups; the channel state information includes at least one of the following: precoding information and channel quality information; the channel quality information includes at least one of the following: RSRP, SINR, and RSRQ.

42. The method of claim 41, wherein, Each of the at least one CSI-RS resource groups includes one CSI-RS resource corresponding to multiple sets of quasi-co-located reference signal configuration information.

43. The method according to any one of claims 23-40, wherein, One of the X CSI-RS resource groups: Each of the multiple CSI-RS resources in the CSI-RS resource group corresponds to a quasi-co-located reference signal configuration information.

44. The method according to any one of claims 23-43, wherein, The relevant information of the X CSI-RS resource groups is contained in a single reporting message, which is reported at least once in a channel and / or a time domain unit; and / or, The relevant information of the X CSI-RS resource groups is associated with the same predetermined channel state information.

45. A communications device comprising: Memory and processor; The memory and the processor are coupled; The memory is used to store instructions that can be executed by the processor; When the processor executes the instructions, it performs the method according to any one of claims 1 to 22, or the method according to any one of claims 23 to 44.

46. A computer readable storage medium, wherein, The computer-readable storage medium stores computer program instructions that, when executed on a computer, cause the computer to perform the method according to any one of claims 1 to 22, or the method according to any one of claims 23 to 44.

47. A computer program product comprising computer program instructions that, when executed by a processor, implement the method according to any one of claims 1 to 22, or implement the method according to any one of claims 23 to 44.

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