CN114071557B

CN114071557B - Method, apparatus, device and storage medium for reporting dynamic channel state information

Info

Publication number: CN114071557B
Application number: CN202010782301.XA
Authority: CN
Inventors: 刘皓
Original assignee: Nokia Shanghai Bell Co Ltd; Nokia Solutions and Networks Oy
Current assignee: Nokia Shanghai Bell Co Ltd; Nokia Solutions and Networks Oy
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2024-08-23
Anticipated expiration: 2040-08-06
Also published as: CN114071557A

Abstract

Embodiments of the present disclosure provide a method, apparatus, device, and computer-readable medium for communication. In the method, the first device may transmit first configuration information for configuring a channel state information reporting mode to the second device, the first configuration information including information on whether or not a dynamic reporting mode is enabled. If the dynamic reporting mode is enabled, the first device determines a first reporting granularity for channel state information of the second device and may send second configuration information including the first reporting granularity to the second device. According to the embodiment of the disclosure, the reporting mode of the channel state information can be adjusted based on the change of the channel condition, and the adjustment period of the reporting mode is shorter, thereby reducing the implementation complexity and the power consumption of the terminal equipment.

Description

Method, apparatus, device and storage medium for reporting dynamic channel state information

Technical Field

Embodiments of the present disclosure relate generally to communication technology and, more particularly, to a technical solution for dynamic channel state information reporting.

Background

In a New Radio (NR) system, since a larger number of antenna ports needs to be supported while improving performance of a multi-user multiple input multiple output (MU-MIMO) technology, a transmitting end requires accurate Channel State Information (CSI) feedback. The accurate CSI can enable the transmitting end to perform proper data processing on data to be transmitted, such as precoding, determining a modulation and coding scheme and the like, so that the data transmission efficiency is improved, the system performance is improved, and the CSI feedback overhead and the implementation complexity of the receiving end are also high.

The Type II (Type II) codebook is defined in NR Rel-15, and compared with the Type I (Type I) codebook, the Type II codebook has higher channel quantization accuracy based on Linear Combination (LC) of orthogonal beams, but CSI feedback overhead is larger. The CSI report for the type II codebook has multiple reporting modes, and the calculation amount required by the different reporting modes is different, however, the configuration about the CSI reporting mode is sent to the terminal device by the base station through the higher layer signaling, so that the CSI reporting mode for the terminal device remains unchanged for a long time and cannot be dynamically changed according to the need, thereby causing greater implementation complexity and power consumption of the terminal device.

Disclosure of Invention

Embodiments of the present disclosure provide a technical solution for dynamic channel state information reporting, and in particular provide a method, apparatus, device and computer readable medium for communication.

In a first aspect of the present disclosure, a method for communication is provided. The method comprises the following steps: first configuration information for configuring a channel state information reporting mode is transmitted at a first device to a second device, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The method further comprises the steps of: if the dynamic reporting mode is enabled, a first reporting granularity for channel state information for the second device is determined. The method further comprises the steps of: second configuration information including the first reporting granularity is sent to the second device.

In a second aspect of the present disclosure, a method for communication is provided. The method comprises the following steps: first configuration information is received at the second device from the first device for configuring the channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The method further comprises the steps of: if the first configuration information indicates that the dynamic reporting mode is enabled, second configuration information is received from the first device including a first reporting granularity for channel state information of the second device.

In a third aspect of the present disclosure, a first apparatus is provided. The first device includes at least one processor and at least one memory storing computer program instructions. The at least one memory and the computer program instructions are configured to, with the at least one processor, cause the first device to: first configuration information for configuring a channel state information reporting mode is transmitted to the second device, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the first device to: if the dynamic reporting mode is enabled, a first reporting granularity for channel state information for the second device is determined. The at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the first device to: second configuration information including the first reporting granularity is sent to the second device.

In a fourth aspect of the present disclosure, a second device is provided. The second device includes at least one processor and at least one memory storing computer program instructions. The at least one memory and the computer program instructions are configured to, with the at least one processor, cause the second device to: first configuration information for configuring the channel state information reporting mode is received from a first device, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the second device to: if the first configuration information indicates that the dynamic reporting mode is enabled, second configuration information is received from the first device including a first reporting granularity for channel state information of the second device.

In a fifth aspect of the present disclosure, an apparatus for communication is provided. The device comprises: the apparatus includes means for transmitting, at a first device, first configuration information for configuring a channel state information reporting mode to a second device, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The apparatus further comprises: means for determining a first reporting granularity for channel state information of the second device if the dynamic reporting mode is enabled. The apparatus further comprises: the apparatus includes means for transmitting, to a second device, second configuration information including a first reporting granularity.

In a sixth aspect of the present disclosure, an apparatus for communication is provided. The device comprises: means for receiving, at the second device, first configuration information from the first device for configuring the channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The apparatus further comprises: means for receiving, from the first device, second configuration information including a first reporting granularity for channel state information of the second device if the first configuration information indicates that the dynamic reporting mode is enabled.

In a seventh aspect of the present disclosure, a computer readable medium is provided. The computer readable medium stores machine executable instructions that, when executed, cause a machine to perform a method according to the first aspect.

In an eighth aspect of the present disclosure, a computer-readable medium is provided. The computer readable medium stores machine executable instructions that, when executed, cause a machine to perform a method according to the second aspect.

It should be understood that what is described in this summary is not intended to limit the critical or essential features of the embodiments of the disclosure nor to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above, as well as additional purposes, features, and advantages of embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown by way of example and not by way of limitation.

Fig. 1 illustrates a schematic diagram of an example communication system in which embodiments of the present disclosure may be implemented.

Fig. 2 shows a schematic diagram of an example communication process between a first device and a second device according to an embodiment of the disclosure.

Fig. 3 illustrates a flowchart of an example method for dynamic channel state information reporting, according to an embodiment of the present disclosure.

Fig. 4 illustrates a flowchart of an example method for determining reporting granularity based on reference signals, according to an embodiment of the disclosure.

Fig. 5 illustrates a flowchart of an example method for dynamic channel state information reporting, according to an embodiment of the present disclosure.

Fig. 6 shows a schematic diagram of a chord distance distribution between wideband CSI and subband CSI according to embodiments of the present disclosure.

Fig. 7 illustrates a simplified block diagram of an example device suitable for implementing embodiments of the present disclosure.

Fig. 8 shows a schematic diagram of an example computer-readable medium according to an embodiment of the disclosure.

The same or similar reference numbers will be used throughout the drawings to refer to the same or like components.

Detailed Description

The principles and spirit of the present disclosure will be described below with reference to several example embodiments shown in the drawings. It should be understood that these example embodiments are merely described to enable those skilled in the art to better understand and practice the present disclosure and are not intended to limit the scope of the present disclosure in any way. In the following description and claims, unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

As used herein, the term "comprising" and the like should be understood to be open-ended, i.e., including, but not limited to. The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first," "second," and the like, may refer to different or the same object and are used solely to distinguish one from another without implying a particular spatial order, temporal order, order of importance, etc. of the referenced objects. In some embodiments, the values, processes, selected items, determined items, devices, means, parts, components, etc. are referred to as "best," "lowest," "highest," "smallest," "largest," etc. It should be understood that such description is intended to indicate that a selection may be made among many available options of functionality, and that such selection need not be better, lower, higher, smaller, larger, or otherwise preferred in further or all respects than other selections.

As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include computing, calculating, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Further, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), and so forth. Further, "determining" may include parsing, selecting, choosing, establishing, and the like.

As used herein, the term "communication network" or "communication system" refers to a network or system that conforms to any suitable communication standard, such as Long Term Evolution (LTE), LTE-advanced (LTE-a), wideband Code Division Multiple Access (WCDMA), high Speed Packet Access (HSPA), narrowband internet of things (NB-IoT), and the like. Furthermore, the communication between the terminal device and the network device or between other communication devices in the communication network or communication system may be performed according to any suitable communication protocol, including, but not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, fifth generation (5G) communication protocols, and/or any other protocol currently known or to be developed in the future. In other words, the embodiments of the present disclosure may be applied to various communication systems. In view of the rapid development of communications, there will of course also be future types of communication technologies and systems that may embody the present disclosure. Accordingly, the scope of the present disclosure should not be limited to apply only to the above-described systems.

As used herein, the term "network device" refers to an entity or node having a particular function in a communication network or computing network. As an example, network devices may include, but are not limited to, access devices, "base stations" (BSs), node BS (NodeB or NB), evolved node BS (eNodeB or eNB), next generation node BS (gNB), remote Radio Units (RRU), radio Heads (RH), remote Radio Heads (RRH), repeaters, or low power nodes such as pico base stations, femto base stations, etc., routers, gateways, switches, bridges, wireless access points, firewalls, mainframe or large servers, cloud computing devices, mobile phones, sites, units, general purpose computing devices, multimedia computers, multimedia tablets, internet nodes, communicators, desktop computers, laptop computers, notebook computers, netbook computers, tablet computers, personal Communication Systems (PCS) devices, personal navigation devices, personal Digital Assistants (PDAs), audio/video players, digital cameras/cameras, positioning devices, television receivers, radio broadcast receivers, electronic book devices, gaming devices, or other devices that may be used for communication, or any combination of the above.

As used herein, the term "terminal device" refers to any terminal device capable of wired or wireless communication with a network device or with each other. By way of example, terminal devices may include, but are not limited to, mobile Terminals (MT), virtual Reality (VR) or Augmented Reality (AR) devices such as AR glasses, subscriber Stations (SS), portable Subscriber Stations (PSS), mobile Stations (MS) or Access Terminals (AT), aircraft, and onboard devices as described above, and the like. The terminal device may be any type of mobile terminal, fixed terminal, or portable terminal, including a mobile handset, a site, a unit, a device, a multimedia computer, a multimedia tablet, an internet node, a communicator, a desktop computer, a laptop computer, a notebook computer, a netbook computer, a tablet computer, a Personal Communication System (PCS) device, a personal navigation device, a Personal Digital Assistants (PDA), an audio/video player, a digital camera/camcorder, a positioning device, a television receiver, a radio broadcast receiver, an electronic book device, a game device, an internet of things (IoT) device, or other devices available for communication, or any combination of the above.

The term "circuit" as used herein refers to one or more of the following: (a) Hardware-only circuit implementations (such as analog-only and/or digital-circuit implementations); and (b) a combination of hardware circuitry and software, such as (if applicable): (i) A combination of analog and/or digital hardware circuitry and software/firmware, and (ii) any portion of a hardware processor and software (including digital signal processors, software, and memory that work together to cause an apparatus, such as a computing device, to perform various functions); and (c) hardware circuitry and/or a processor, such as a microprocessor or a portion of a microprocessor, that requires software (e.g., firmware) for operation, but may not have software when software is not required for operation.

Definition of circuitry applies to all scenarios in which this term is used in this application (including in the claims). As another example, the term "circuitry" as used herein also covers an implementation of only a hardware circuit or processor (or multiple processors), or a portion of a hardware circuit or processor, or its accompanying software or firmware. For example, if applicable to particular claim elements, the term "circuitry" also covers a baseband integrated circuit or a processor integrated circuit or a similar integrated circuit in other computing devices.

As mentioned above, the type II codebook is defined in third generation partnership project (3 GPP) release 15 (Rel-15). The type II codebook has higher channel quantization accuracy, but the CSI feedback overhead is larger. In order to reduce feedback overhead, a type II port selection codebook has been introduced in Rel-15 that uses a Discrete Fourier Transform (DFT) to Spatially Domain (SD) transform the channel matrix to determine the appropriate beamforming vector and transmit the beamformed channel state information reference signal (CSI-RS), thereby reducing the number of antenna ports loaded onto the CSI-RS and saving pilot signaling overhead. After passing through the SD transform, the terminal device may acquire an equivalent channel by receiving the beamformed CSI-RS and select all or part of the antenna ports from among the received antenna ports without performing the SD transform. The terminal device only needs to report a simple port selection index instead of the beam index of the spatial domain. Thus, the implementation complexity and feedback overhead of the terminal device are reduced simultaneously.

In Rel-16, the 3GPP further enhances the Rel-15 type II port selection codebook. The enhanced type II port selection codebook in Rel-16 reduces the number of frequency domain subbands by performing compression in the Frequency Domain (FD) dimension of the channel, i.e., by frequency domain transformation to select frequency domain components, in addition to compression in the antenna port dimension, i.e., SD transformation, as compared to the type II port selection codebook in Rel-15. In addition, in Rel-17, partial reciprocity of uplink and downlink channel statistics (including angle and delay) is used for frequency division multiple access (FDD) CSI enhancement, which means that partial uplink channel information can be obtained through measurement of an uplink channel, and this partial uplink channel information can be equivalently regarded as information of a downlink channel. Thus, the network device may determine a downlink channel matrix from an uplink channel matrix in consideration of the channel angle and partial reciprocity of delay information, thereby making it possible to perform FD transformation at the network device to select FD components without requiring terminal device reporting. In this way, the implementation complexity and feedback overhead of the terminal device are further reduced.

However, the channel state information obtained using channel reciprocity is only partial channel state information, and in order to calculate and quantize the linear combining coefficients for reporting, the terminal device still needs to measure downlink equivalent channel information based on beamformed CSI-RS resources and then perform normal channel transform operations, such as eigenvalue decomposition (EVD) or Singular Value Decomposition (SVD), on selected antenna ports. In addition, in order to improve CSI feedback accuracy, the terminal device may report CSI to the network device through two reporting manners of Wideband (WB) reporting or Subband (SB) reporting. The user equipment performs WB EVD or SVD operation only once on all Physical Resource Blocks (PRBs) in a wideband reporting mode, and then calculates and quantizes linear combining coefficients of WB level without performing FD component selection; and in the sub-band reporting mode, the user equipment performs SB EVD or SVD operation on PRBs on each sub-band respectively, and then calculates and quantizes the linear combination coefficient of each sub-band. Therefore, the implementation complexity of the UE at WB reporting granularity is only 1/N _b of the SB implementation complexity compared to SB reporting granularity, where N _b is the number of subbands included in the overall bandwidth of the system. Therefore, there is a need to further simplify the implementation process of the type II codebook port selection scheme to further reduce the implementation complexity and feedback overhead of the terminal device.

The inventors have noted that according to existing schemes, the terminal device CSI report is set by parameters in higher layer signaling regarding CSI reporting configuration. In addition, for each reporting setting, the reporting granularity in the frequency domain is indicated by parameters related to frequency domain reporting in higher layer signaling, including Wideband (WB) or Subband (SB) CSI reporting granularity, which is much more computationally intensive than wideband reporting granularity. The type II port selection CSI may also be configured as WB or SB CSI reports, but it is typically achieved by RRC signaling for a long period of time. Since the CSI reporting granularity does not change dynamically as needed, the terminal device uses the CSI reporting mode with higher accuracy even when only CSI with lower accuracy is needed. Thus, computing resources and power consumption of the terminal device are wasted. However, no feasible technical solution for implementing the dynamic channel state information report exists at present.

In view of the foregoing and other potential problems with conventional schemes, embodiments of the present disclosure propose a dynamic channel state information reporting technique, which may be used, for example, in a scenario where a terminal device feeds back channel state information to a network device. The basic idea of this solution is that the network device dynamically determines the CSI frequency reporting granularity of the terminal device from a reference signal (e.g. an uplink sounding reference signal SRS) and sends it to the terminal device via low layer signaling. After the terminal device receives the lower layer signaling including the CSI frequency reporting granularity, the terminal device may send CSI to the network device based on the CSI frequency reporting granularity. By the embodiment of the disclosure, the lower layer signaling has higher and more reliable sending frequency than the higher layer signaling, so that the CSI reporting mode can be dynamically changed according to the requirement, and the complexity and the feedback overhead of the terminal equipment are reduced. Several embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Fig. 1 illustrates a schematic diagram of an example communication system 100 in which embodiments of the present disclosure may be implemented. As shown in fig. 1, an example communication system (which may also be referred to as an example communication network) 100 may include a first device 110 and a second device 120, which may communicate via a wireless link.

As shown in dashed lines, the second device 120 may communicate with the first device 110 over the entire system bandwidth of the communication system 100 via communication links 130-1 and 130-2 (collectively communication links 130) within the coverage area of the cell 112 of the first device 110. The system bandwidth may be divided into a plurality of sub-bands. The communication link 130-1 from the first device 110 to the second device 120 is referred to as a downlink 130-1, and the communication link 130-2 from the second device 120 to the first device 110 is referred to as an uplink 130-2. In addition, the first device 110 and the second device 120 may each be configured with multiple antennas. For each communication device in the communication system 100, the plurality of antennas configured may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Thus, communication between the first device 110 and the second device 120 may be via multiple antenna techniques.

Since the channel is noisy and there is interference between the second devices, the first device 110 needs to precode the data in order to ensure that the second device 120 properly receives the data sent by the first device 110. The precoding technology may be that in the case of a known channel state, the signal to be transmitted is processed in advance at the transmitting device, that is, by means of a precoding matrix matched with channel resources, so that the precoded signal to be transmitted is matched with a channel, thereby reducing the complexity of the receiving device in eliminating the influence between channels.

In order to acquire a precoding matrix that can be matched to a channel, the first device 110 needs to acquire CSI of the downlink communication link 130-1. CSI typically includes Precoding Matrix Indication (PMI), channel Quality Indicator (CQI), and Rank Indication (RI). The PMI is used to indicate a precoding matrix, and the first device 110 may select the precoding matrix used to precode data according to the PMI. The CQI indicates channel quality for the first device 110 to provide a reference for determining the modulation coding scheme. RI indicates the maximum number of data layers that the first device 110 can simultaneously transmit to the second device 120, and the larger RI indicates the greater number of maximum data layers to simultaneously transmit. The selection of the PMI is often related to a channel matrix between the first device 110 and the second device 120, and the higher the matching degree between the precoding matrix represented by the PMI and the channel matrix, the better the first device 110 can suppress multi-user interference by selecting the precoding matrix according to the PMI to perform precoding on data.

In downlink transmission, the first device 110 may transmit a reference signal, e.g., a channel state information reference signal (CSI-RS), for downlink channel measurements on the downlink communication link 130-1. The second device 120 may perform CSI measurement according to the received CSI-RS, and feed back CSI of the downlink channel to the first device 110. In uplink transmission, the second device 120 may transmit a reference signal, e.g., a Sounding Reference Signal (SRS), for uplink channel measurement on the uplink communication link 130-2. The first device 110 may perform CSI measurement according to the received SRS, and indicate CSI of the uplink channel to the second device 120.

It should be understood that the types of reference signals listed above are exemplary only and should not be construed as limiting the application in any way nor excluding the possibility of using other reference signals to accomplish the same or similar functions.

For the type II codebook, the second device 120 may transmit CSI of the downlink channel to the first device 110 through two reporting manners of a wideband report or a subband report. Specifically, the second device 120 may report the quantized values of the selected beam and the wideband linear combining coefficient corresponding to each beam through wideband feedback, or may report the quantized values of the linear combining coefficient compressed in the frequency domain corresponding to each beam through subband feedback, where the linear combining coefficient includes, for example, the amplitude and phase information of the coefficient. The first device 110 may recover the precoding matrix from the wideband feedback information or the subband feedback information.

In addition, to configure the CSI reporting mode, the first device 110 may transmit configuration information to the second device 120 via higher layer signaling. The second device 120 may send CSI to the first device 110 according to the CSI reporting granularity in the configuration information.

It should be appreciated that fig. 1 only schematically illustrates devices, units, modules, components or elements of an example communication system 100 that are relevant to embodiments of the present disclosure. In practice, the example communication system 100 may also include other devices, units, modules, components, or elements for other functions. Furthermore, the particular number and connection of devices, units, modules, components or elements shown in fig. 1 is merely illustrative and is not intended to limit the scope of the disclosure in any way. In other embodiments, the example communication system 100 may include any suitable number of first devices, second devices, or other devices or elements, may have any suitable connection relationship therebetween, and so forth. Thus, embodiments of the present disclosure are not limited to the specific devices, units, modules, components, or elements depicted in fig. 1, but may be generally applicable to any technical environment in which two or more communication devices communicate via a communication link.

Further, the links or links between the various devices in the example communication system 100 may be any form of connection or coupling capable of data communication or control signal communication between the various devices or components of the example communication system 100, including, but not limited to, coaxial cables, fiber optic cables, twisted pair wires, or wireless technologies (such as infrared, radio, and microwave). In some embodiments, these links or links may also include, but are not limited to, network cards, hubs, modems, repeaters, bridges, switches, routers, etc. for network connected devices, as well as various network connection lines, wireless links, etc. In some embodiments, these links or links may include various types of buses. In other embodiments, these links or links may include computer networks, communication networks, or other wired or wireless networks.

It should also be noted that the communications in the example communication system 100 may be implemented in accordance with any suitable communication protocol, including, but not limited to, first generation (1G), second generation (2G), third generation, fourth generation (4G), and fifth generation (5G) cellular communication protocols and the like, wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 or other IEEE protocols, and/or any other protocols currently known or to be developed. Further, the communication may utilize any suitable wireless communication technology or wired communication technology, including, but not limited to, code Division Multiple Access (CDMA), frequency Division Multiple Access (FDMA), time Division Multiple Access (TDMA), frequency Division Duplex (FDD), time Division Duplex (TDD), multiple Input Multiple Output (MIMO), orthogonal frequency division multiple access (OFDM), discrete fourier transform spread spectrum OFDM (DFT-s-OFDM), and/or any other technology currently known or developed in the future.

An example communication procedure between the first device 110 and the second device 120 is described below with reference to fig. 2, such that the first device 110 may dynamically configure a channel state information reporting mode for the second device 120. Fig. 2 shows a schematic diagram of an example communication process 200 between the first device 110 and the second device 120, according to an embodiment of the disclosure. For purposes of illustration, the example communication process 200 will be described with reference to fig. 1, however, it should be appreciated that the example communication process 200 may be equally applicable to any other suitable scenario in which two or more communication devices or other devices communicate with each other.

Information indicating whether the dynamic reporting mode is enabled is added to the configuration information. As shown in fig. 2, after the second device 120 establishes a connection (e.g., through a Radio Resource Control (RRC) connection) with the access first device 110 to access the cell 112, the first device 110 transmits (202) configuration information (hereinafter referred to as "first configuration information" for convenience of description) for including a configuration channel state information reporting mode to the second device 120. The first configuration information may include information regarding whether a dynamic reporting mode is enabled. The second device 120 may determine whether to transmit channel state information using the first configuration information based on whether the dynamic reporting mode is enabled. The transmitted first configuration information may be received (204) by the second device 120. Then, if the dynamic reporting mode is enabled, the first device 110 may determine (208) a reporting granularity (hereinafter referred to as a "first reporting granularity" for convenience of description) of channel state information for the second device 120. Prior to determining the first reporting granularity, the second device 120 may send (206) a reference signal to the first device 110, causing the first device 110 to receive (208) the reference signal.

The first device 110 may then make CSI measurements from the received reference signals and send (210) another configuration information (hereinafter referred to as "second configuration information" for ease of description) including the first reporting granularity to the second device 120. The transmitted second configuration information is received (212) by the second device 120. The first device 110 may also determine and send a trigger message to the second device 120 to trigger CSI reporting. The first device 110 may send the second configuration information to the second device 120 along with the trigger message. The transmitted second configuration information and trigger message are received by the second device 120. The second device 120 then sends (214) CSI to the first device 110 at the first reporting granularity. The first device 110 receives (216) the CSI.

As can be seen, according to embodiments of the present disclosure, based on the information in the first configuration information regarding the indication of the dynamic reporting mode, the second device 120 may transmit CSI to the first device 110 according to the first reporting granularity in the second configuration information, instead of transmitting at the reporting granularity in the first configuration information. The dynamic reporting mode enables the second device 120 to dynamically change CSI reporting modes as needed, reducing complexity and feedback overhead of the second device 120. Some example embodiments will now be described in detail.

Fig. 3 illustrates an example for dynamically configuring a channel state information report 300 according to an embodiment of the present disclosure. For example, the method 300 may be implemented by the first device 110 as shown in fig. 1. It should be understood that method 300 may also be implemented by any suitable other communication device, which is merely exemplary and should not be construed as limiting the scope of the present disclosure in any way.

In block 310, the first device 110 transmits first configuration information for configuring a channel state information reporting mode to the second device 120. Generally, after the second device 120 establishes a connection (e.g., a Radio Resource Control (RRC) connection) with the access first device 110 to access the cell 112, the first device 110 transmits first configuration information for configuring the channel state information reporting mode to the second device 120. The first configuration information is typically sent to the second device 120 by higher layer signaling, e.g., RRC signaling. According to an embodiment of the present disclosure, as described above, the first configuration information may include information indicating whether the dynamic reporting mode is enabled. For example, the first configuration information may include a parameter to indicate whether the dynamic reporting mode is enabled or disabled. It should be understood that the indications of dynamic reporting modes set forth herein are given by way of example only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will appreciate that there are many different ways to indicate the dynamic reporting mode.

In some embodiments, the first device 110 transmitting the first configuration information may include: higher layer signaling including the first configuration information is sent to the second device 120. The higher layer signaling may be layer three signaling, such as RRC, etc. It will be appreciated that the first device 110 may use any suitable higher layer signaling to transmit the first configuration information.

In general, the first configuration information may further include information related to channel state information. As an example, in some embodiments, the first configuration information may include one or more of the following: reporting manners used for CSI (e.g., periodic CSI report, aperiodic CSI report, etc.), reporting granularity (e.g., wideband reporting granularity, subband reporting granularity, etc.), and information about reference signals for channel measurement (e.g., CSI-RS, SRS, etc.), etc. It should be understood that the inclusion of configuration information set forth herein is given by way of example only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will appreciate that other information related to channel state information may also be included in the configuration information.

The reference signal for channel measurement also has various transmission modes, such as periodic or aperiodic, etc. The first device 110 may periodically or aperiodically transmit the downlink reference signal. The second device 120 performs downlink channel measurement according to the downlink reference signal to obtain downlink CSI, and transmits the downlink CSI to the first device 110. The second device 120 may periodically or aperiodically transmit the uplink reference signal to the first device 110 according to the received first configuration information. After receiving the uplink reference signal, the first device 110 may make uplink channel measurements. It will be appreciated that the first device 110 and the second device 120 may determine the uplink CSI and the downlink CSI using any suitable manner.

In block 310, the first device 110 may determine first configuration information for configuring the channel state information reporting mode according to different conditions. The different conditions may be, for example, current channel conditions, amount of available resources, priority of the second device 120, scheduling priority of the traffic, etc. The first device 110 may also determine default first configuration information for the second device 120. It should be appreciated that the initial determination of configuration information may vary depending on the environment, communication standards, protocols, requirements, and other relevant factors. That is, the initial determination of configuration information set forth herein is given by way of example only and should not be taken as limiting the scope of the present disclosure. Those skilled in the art will appreciate that there are many different ways of initially determining configuration information based on actual needs.

As can be seen from the above description, first configuration information for configuring the channel state information reporting mode is transmitted to the second device 120 by the first device 110, and the first configuration information includes information indicating whether the dynamic reporting mode is enabled. After transmitting the first configuration information including information indicating whether the dynamic reporting mode is enabled in block 310, the method proceeds to block 320, where the first device 110 determines whether the dynamic reporting mode is enabled. If the dynamic reporting mode is enabled (branch "yes"), the method 300 proceeds to block 330. In block 330, the first device 110 determines a reporting granularity (hereinafter referred to as a "first reporting granularity" for convenience of description) of channel state information for the second device 120. In some embodiments, if the dynamic reporting mode is not enabled, the first configuration information may also include another reporting granularity (hereinafter referred to as a "second reporting granularity" for convenience of description) for the second device to transmit channel state information to the first device 110 if the dynamic reporting mode is not enabled.

In some embodiments, the first reporting granularity may be a wideband reporting granularity or a subband reporting granularity. The wideband report granularity is used to transmit wideband channel state information determined over the entire bandwidth between the first device 110 and the second device 120, while the subband report granularity is used to transmit subband channel state information determined over each subband of the entire bandwidth between the first device 110 and the second device 120 (e.g., the entire bandwidth allocated for the second device 120). In some embodiments, the second reporting granularity may also be a wideband reporting granularity or a subband reporting granularity, and the second reporting granularity may be different from or the same as the first reporting granularity. When the broadband reporting granularity is used, the implementation complexity and feedback overhead of the receiving end can be reduced, and when the subband reporting granularity is used, the feedback precision of the CSI can be improved, so that the sending end performs proper data processing on data to be sent, the data transmission efficiency is improved, and the system performance is improved. In some embodiments, the second device 120 performs WB EVD or SVD operations only once for all Physical Resource Blocks (PRBs) over the entire bandwidth for the second device 120 at the wideband reporting granularity to calculate and quantize the linear combining coefficients at WB level; and the second device 120 performs SB EVD or SVD operations on PRBs on each sub-band for the entire bandwidth of the second device 120 at sub-band reporting granularity, respectively, to calculate and quantize linear combining coefficients for the respective sub-bands. Thus, WB reporting granularity is reduced by a factor of N _b compared to SB reporting granularity, but the accuracy is lower, where N _b is the number of subbands included in the entire bandwidth allocated for the second device 120. Thus, when the previously used subband reporting granularity is changed to the wideband reporting granularity according to the current condition, the implementation complexity and power consumption of the terminal device will be reduced.

In some embodiments, the first device 110 may receive a reference signal from the second device 120, based on which a first reporting granularity is determined. As can be seen from the above description, the first device 110 may receive an uplink reference signal (e.g., SRS) from the second device 120, perform uplink channel measurement according to the received uplink reference signal, and determine a first reporting granularity of channel state information according to the measurement result.

Fig. 4 illustrates an example for determining reporting granularity 400 based on reference signals according to example embodiments of the disclosure. For example, the method 400 may be implemented by the first device 110 as shown in fig. 1. It should be understood that method 400 may also be implemented by any suitable other communication device, which is merely exemplary and should not be construed as limiting the scope of the present disclosure in any way.

In block 410, the first device 110 determines a matrix of channels between the first device 110 and the second device 120 based on the reference signal. In some embodiments, the first device 110 determines that the uplink FD channel H _FD,H_FD has the dimension N _u×N_g×N_f based on the received SRS, where N _u is the number of antenna ports in the second device 120, N _g is the number of antenna ports in the first device 110, and N _f is the number of active subcarriers or PRBs. The first device 110 may then determine a set of spatial beams per polarization from the uplink FD channel H _FD using FDD reciprocity and form a diagonal matrix W ₁ to be used for uplink CSI-mode selection and downlink beamformed CSI-RS transmissions. The first device 110 weights in the second dimension of the uplink FD channel H _FD using the diagonal matrix W ₁ to convert to an equivalent channel of dimension N _u×N_p×N_f Where N _p is the number of beam-shaping ports in the first device 110 (assuming it is equal to the number of ports selected by the second device 120 in the downlink). In this way, the number of ports is compressed in the spatial domain.

After determining the matrix of channels between the first device 110 and the second device 120 in block 410, the method proceeds to block 420 where the first device 110 determines a wideband eigenvector matrix based on the matrix over the entire bandwidth between the first device 110 and the second device 120. In some embodiments, the first device 110 averages channel information over a plurality of subbands included over the entire bandwidth to perform one EVD or SVD operation to obtain WB eigenvectors, and constructs the WB eigenvectors as a wideband eigenvector matrix V _wb having a dimension N _p×N_r, where N _r is a rank indication or number of layers. The method then proceeds to block 430 where the first device 110 determines a subband eigenvector matrix on each subband of the overall bandwidth between the first device 110 and the second device 120 based on the matrix. In some embodiments, the first device 110 performs EVD or SVD operations to obtain a set of SB eigenvectors, respectively, by averaging channel information over each subband included over the entire bandwidth, respectively, and constructs the multiple sets of SB eigenvectors as a subband eigenvector matrix V _sb having a dimension of N _p×N_r×N_b, where N _b is the number of subbands. It should be appreciated that the subband eigenvector matrix may also be determined over a portion of the subband of the overall bandwidth between the first device 110 and the second device 120, and further that the order of execution of blocks 420 and 430 set forth herein is given by way of example only and should not be construed as limiting the scope of the present disclosure. Those skilled in the art will appreciate that blocks 420 and 430 may be performed simultaneously or in a different order than presented in the present embodiment.

After the wideband feature vector matrix and the subband feature vector matrix are determined in blocks 420 and 430, the method proceeds to block 440 where the first device 110 determines a correlation (or similarity) between the wideband feature vector matrix and the subband feature vector matrix. In block 450, the first device 110 may compare the calculated correlation to a predetermined threshold. If the correlation is greater than or equal to the predetermined threshold (branch "yes"), the method 400 proceeds to block 460 where the first reporting granularity is determined to be a wideband reporting granularity that is used to transmit wideband channel state information determined across the entire bandwidth between the first device 110 and the second device 120. If the correlation is less than the predetermined threshold (branch "no"), the method 400 proceeds to block 470 where the first reporting granularity is determined to be a subband reporting granularity, which is used to transmit the determined subband channel state information over each subband of the overall bandwidth between the first device 110 and the second device 120.

In some embodiments, the correlation or similarity between WB and SB feature vector matrices may be determined according to chordal distance rules, as shown in equation 1:

Where N _r represents rank indication or number of layers, N _b represents the number of subbands, V _sb represents a subband eigenvector matrix, V _wb represents a wideband eigenvector matrix, chordal distance value M e 0,1, H represents a conjugate transpose, | … | represents a modulo operation. The first device 110 may then compare the chordal distance value M calculated according to equation (1), which may characterize the correlation between the wideband feature vector matrix and the subband feature vector matrix, with a threshold value, the greater the chordal distance value M, which may be represented by 1-M, the greater the chordal distance between the wideband feature vector matrix and the subband feature vector matrix, i.e., the lesser the correlation. For example, if the correlation between the WB and SB eigenvector matrices is 1-M++threshold α, then the second device 120 reports WB CSI to the first device 110, resulting in reduced implementation complexity and feedback overhead for the second device 120. Otherwise, second device 120 reports SB CSI to first device 110.

By determining the correlation or similarity between the wideband feature vector matrix and the subband feature vector matrix, a distinction between using WB reporting granularity and using SB reporting granularity may be determined, and when the distinction is not large, WB reporting granularity may be used instead of SB reporting granularity, thereby reducing implementation complexity and power consumption of second device 120. It will be appreciated that the first device 110 may determine the correlation or similarity between the wideband feature vector matrix and the subband feature vector matrix using any suitable means. In addition, those skilled in the art will appreciate that the predetermined threshold may take any suitable value as desired.

As can be seen from the above description, the correlation between the wideband feature vector matrix and the subband feature vector matrix is determined by the first device 110. Still referring to fig. 3, after determining the first reporting granularity of the channel state information for the second device 120 in block 330, the method proceeds to block 340. In block 340, the first device 110 sends another configuration information (hereinafter referred to as "second configuration information" for ease of description) including the first reporting granularity to the second device 120. In some embodiments, the first device 110 may transmit channel control information or a Control Element (CE) of a Medium Access Control (MAC) including the second configuration information, e.g., downlink Control Information (DCI) transmitted on a Physical Downlink Control Channel (PDCCH) of layer one or a MAC CE of layer two, etc., to the second device 120. Since the uplink channel CSI reporting mode determined by the first device 110 also has uplink and downlink reciprocity, the uplink channel CSI reporting mode determined by the first device 110 may also be used for the downlink channel CSI reporting mode. It will be appreciated that the first device 110 may use any suitable lower layer signaling to send the second configuration information. The second device 120 may make downlink channel measurements based on the second configuration information and send channel state information to the first device 110 at a first reporting granularity.

As can be seen, according to embodiments of the present disclosure, according to the information in the higher layer signaling regarding the indication of the dynamic reporting mode being enabled, the second device 120 may transmit CSI to the first device 110 according to the first reporting granularity carried in the lower layer signaling, instead of transmitting at the second reporting granularity carried in the higher layer signaling. Since lower layer signaling is sent more frequently and more reliably than higher layer signaling, the dynamic reporting mode enables the second device 120 to dynamically change CSI reporting modes as needed, further reducing the complexity and power consumption of the second device 120.

As can be seen from the above description, the CSI reporting mode includes a periodic CSI reporting mode and an aperiodic CSI reporting mode. In the aperiodic CSI reporting mode, the second device 120 transmits channel state information to the first device 110 in response to a trigger message of the first device 110. In some embodiments, the channel control information or control element of the medium access control further comprises trigger information to trigger the second device 120 to send channel state information at the first reporting granularity. In some embodiments, when transmitting channel control information to the second device 120, the first device 110 may transmit channel control information including trigger information and second configuration information to the second device 120 to trigger the second device 120 to transmit channel state information at the first reporting granularity. In some embodiments, the first reporting granularity may be indicated in 1 bit using one parameter in the channel control information. In some embodiments, the channel control information is Downlink Control Information (DCI). In this way, it is compatible with existing standards, thereby saving signaling overhead.

In some embodiments, when transmitting the control element of the medium access control to the second device 120, the first device 110 may transmit the control element of the medium access control including the trigger information and the second configuration information to the second device to trigger the second device 120 to transmit the channel state information at the first reporting granularity. In some embodiments, the first reporting granularity may be indicated with 1 bit using one parameter in a control element of the medium access control.

It should be appreciated that the second configuration information may be transmitted using any suitable signaling, while the first reporting granularity may be indicated using any suitable manner.

The second device 120 may then send channel state information to the first device 110 at the first reporting granularity.

In some embodiments, the first device 110 comprises a network device and the second device 120 comprises a terminal device.

In some embodiments, an apparatus (e.g., first device 110) capable of performing the example method 300 may include means for performing the respective steps of the example method 300. The components may be implemented in any suitable form. For example, the components may be implemented in circuitry or in software modules. For another example, the component may include at least one processor and at least one memory. The at least one memory may store computer program code. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to perform the corresponding steps.

In some embodiments, the apparatus comprises: means for transmitting, at the first device, first configuration information for configuring a channel state information reporting mode to the second device, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The apparatus further comprises: means for determining a first reporting granularity for channel state information of the second device if the dynamic reporting mode is enabled. The apparatus further comprises: the apparatus includes means for transmitting, to a second device, second configuration information including a first reporting granularity.

In some embodiments, the first configuration information further includes a second reporting granularity for the second device to send channel state information to the first device if the dynamic reporting mode is not enabled.

In some embodiments, the first reporting granularity is a wideband reporting granularity or a subband reporting granularity, the wideband reporting granularity for transmitting wideband channel state information determined over an entire bandwidth between the first device and the second device, the subband reporting granularity for transmitting subband channel state information determined over each subband of the entire bandwidth between the first device and the second device.

In some embodiments, the means for determining the first reporting granularity comprises: means for receiving a reference signal from a second device; and means for determining a first reporting granularity based on the reference signal.

In some embodiments, the means for determining the first reporting granularity based on the reference signal comprises: means for determining a matrix of channels between the first device and the second device based on the reference signal; means for determining a wideband eigenvector matrix over the entire bandwidth between the first device and the second device based on the matrix; means for determining a subband eigenvector matrix on each subband of the overall bandwidth between the first device and the second device based on the matrix; means for determining a correlation between the wideband feature vector matrix and the subband feature vector matrix; and means for determining a first reporting granularity as a wideband reporting granularity for transmitting wideband channel state information determined over the entire bandwidth between the first device and the second device if the correlation is greater than or equal to a predetermined threshold; and means for determining the first reporting granularity as a subband reporting granularity for transmitting subband channel state information determined on each subband of the entire bandwidth between the first device and the second device if the correlation is less than a predetermined threshold.

In some embodiments, the means for transmitting the first configuration information comprises: means for sending higher layer signaling including the first configuration information to the second device.

In some embodiments, the means for transmitting the second configuration information comprises: and means for transmitting channel control information or control elements of medium access control including the second configuration information to the second device.

In some embodiments, the channel control information or control element of the medium access control further comprises trigger information to trigger the second device to send channel state information at the first reporting granularity.

In some embodiments, the apparatus comprises a network device and the second device comprises a terminal device.

Fig. 5 illustrates an example for dynamically configuring a channel state information report 500 according to an embodiment of the present disclosure. For example, the method 500 may be implemented by the second device 120 as shown in fig. 1. It should be understood that method 500 may also be implemented by any suitable other communication device, which is merely illustrative and should not be construed as limiting the application in any way.

In block 510, first configuration information is received from the first device 110 for configuring a channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled. After receiving the first configuration information including information indicating whether the dynamic reporting mode is enabled in block 510, the method proceeds to block 520, where the second device 120 determines whether the dynamic reporting mode is enabled. If the dynamic reporting mode is enabled (branch "yes"), the method 500 proceeds to block 530. In block 530, second configuration information including a first reporting granularity for channel state information of the second device 120 is received from the first device 110.

Additionally, in some embodiments, if the first configuration information indicates that the dynamic reporting mode is not enabled, the second device 120 may obtain a second reporting granularity from the first configuration information and send channel state information to the first device at the second reporting granularity.

In some embodiments, the first reporting granularity may be a wideband reporting granularity. The wideband report granularity is used to transmit wideband channel state information determined over the entire bandwidth between the first device and the second device. Thus, the realization complexity and the feedback overhead of the receiving end can be reduced.

Alternatively, in other embodiments, the first reporting granularity may also be a subband reporting granularity. The subband reporting granularity is used to transmit subband channel state information determined on each subband of the overall bandwidth between the first device and the second device. In this way, the feedback precision of the CSI can be improved, and the sending end performs proper data processing on the data to be sent, so that the data transmission efficiency is improved, and the system performance is improved.

As an example, the second reporting granularity may also be a wideband reporting granularity or a subband reporting granularity. In some embodiments, the second reporting granularity may be the same as the first reporting granularity. Alternatively, in other embodiments, the second reporting granularity may be different from the first reporting granularity.

In some embodiments, the second device 120 may receive higher layer signaling including the first configuration information from the first device 110.

In some embodiments, the second device 120 may receive channel control information or control elements of medium access control including the second configuration information from the first device 110. In this way, the second device 120 can receive the reporting granularity for the channel state information transmitted by the lower layer signaling, and since the period of the lower layer signaling transmission is relatively short and the reliability is relatively high, the reporting mode of the channel state information can be dynamically adjusted based on the variation of the channel condition, thereby reducing the implementation complexity and power consumption of the terminal device.

In some embodiments, the second device 120 sends channel state information to the first device 110 at a first reporting granularity if it is determined that the channel control information or the control element of the medium access control includes trigger information. Thus, the second device 120 can change the reporting granularity of transmitting the channel state information as needed with a shorter period, thereby further reducing the power consumption and complexity of the terminal device.

In some embodiments, the first device may be, for example, a network device and the second device may be, for example, a terminal device.

In some embodiments, an apparatus (e.g., second device 120) capable of performing the example method 500 may include means for performing the respective steps of the example method 500. The components may be implemented in any suitable form. For example, the components may be implemented in circuitry or in software modules. For another example, the component may include at least one processor and at least one memory. The at least one memory may store computer program code. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus to perform the corresponding steps.

In some embodiments, the apparatus further comprises: means for receiving first configuration information for configuring a channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled. The apparatus further comprises: means for receiving, from the first device, second configuration information including a first reporting granularity for channel state information of the second device if the first configuration information indicates that the dynamic reporting mode is enabled.

In some embodiments, the apparatus further comprises: means for obtaining a second reporting granularity from the first configuration information if the first configuration information indicates that the dynamic reporting mode is not enabled; and means for transmitting channel state information to the first device at a second reporting granularity.

In some embodiments, the means for receiving the first configuration information comprises: means for receiving higher layer signaling including first configuration information from a first device.

In some embodiments, the means for receiving the second configuration information comprises: means for receiving channel control information or control elements of medium access control including second configuration information from the first device.

In some embodiments, the apparatus further comprises: means for transmitting channel state information to the first device at a first reporting granularity if it is determined that the channel control information or the control element of the medium access control includes trigger information.

In some embodiments, the apparatus comprises a terminal device and the first device comprises a network device.

The payload size and its comparison between Rel.16 type II port selection SB CSI, rel.17type II port selection SB CSI to disable dynamic reporting mode, and Rel.17Type II port selection CSI to enable dynamic reporting mode are discussed in detail below. The following are assumed: the number of beamformed CSI-RS ports is N _p = 2L = 8 (where 2 is two polarization directions); the number of configured PMI subbands is N ₃ =13; the number of layers is ri=2; the number of FD components is m=8; the maximum number of non-zero (NZ) Linear Combining (LC) coefficients for the multilayer is K _NZ =36; the reference amplitude for the strongest FD coefficients in weak polarization is quantized to 4 bits, the differential amplitude for the remaining FD coefficients is quantized to 3 bits, and the phase of the LC coefficients is quantized to 3 bits.

Table 1 lists the payload sizes of rel.16type II port select SB CSI.

TABLE 1

Table 2 lists the payload sizes of the rel.17type II ports for selecting CSI using FDD reciprocity when configuring SB reports in RRC or DCI. By utilizing the FDD reciprocity of the channel delay information, compared with rel.16type II port selection CSI, the terminal device does not need to report FD component selection, and other CSI items should be reported normally.

TABLE 2

Table 3 lists the payload sizes of the rel.17type II ports for selection CSI using FDD reciprocity when WB reports are configured in RRC or DCI. Only WB amplitude and phase values of the linear combination coefficients as listed in rel.15 should be reported.

TABLE 3 Table 3

For the payload size of the rel.17type II port-selective CSI that enables the dynamic reporting mode, first, the payload size of each CSI mode is calculated for SB CSI in table 2 and WB CSI in table 3, respectively, and then the average payload size of the rel.17type II port-selective CSI that enables the dynamic reporting mode is (1- γ) ×346+γ×90 according to the overall switching probability γ of the WB CSI mode that is counted for a long time.

Referring to tables 1 to 3 above, payloads of the above CSI schemes are compared with each other. Table 4 lists a comparison of payload sizes for different CSI schemes

TABLE 4 Table 4

In order to perform performance evaluation on the proposed dynamic class II port selection CSI scheme using FDD reciprocity, system level evaluation of full queue traffic is performed in the LTE 3D UMa scenario. The results are provided for 16 transmit ports having (N1, N2) = (4, 2) in the horizontal and vertical directions, respectively. The relevant simulation parameters for the system level evaluation are listed in table 5.

TABLE 5

The antennas use cross polarization area arrays, have horizontal dimensions and vertical dimensions, M represents the number of antennas in the vertical dimensions, N represents the number of antennas in the horizontal dimensions, P represents the number of polarization directions, d _V represents the spacing between the vertical antennas, d _H represents the spacing between the horizontal antennas, and lambda represents the wavelength.

Fig. 6 shows the probability distribution between WB and SB channel chordal distance (M) for each terminal device in each feedback instance. As shown in fig. 6, 610 indicates a probability distribution curve between WB and SB channel chordal distance (M), where the probability of M <0.1 is about 15%. This means that in some cases (about 10%) WB eigenvectors are very similar to SB eigenvectors in terms of chordal distance statistics, so WB CSI feedback is sufficient to describe the channel in this case. In this example, the threshold factor α is set to 0.6, and the total switching probability of WB CSI mode is 80%. According to table 4, the average payload size of the dynamic class II port selection CSI is (1- γ) ×346+γ×90=141 bits.

With rel.16ii type port selection CSI as a performance reference, table 6 lists system level performance evaluations for different CSI schemes.

TABLE 6

As shown in table 6, when the switching threshold factor α is set to 0.6, about 80% of CSI mode is selected as WB CSI, so the feedback overhead of dynamic Type II port selection CSI is greatly reduced by about 60% compared to before, with limited performance loss. Regarding implementation complexity of the terminal device, when switching to the WB CSI mode, the terminal device performs EVD operation only once, and implementation complexity is only 1/N _b compared to the SB CSI mode, where N _b is the number of subbands.

Fig. 7 illustrates a simplified block diagram of an example device 700 suitable for implementing embodiments of the disclosure. The example device 700 may be used to implement a communication device, such as the first device 110 and the second device 120 of fig. 1. As shown, the example device 700 includes one or more processors 710, one or more memories 720 coupled to the processors 710, and one or more communication modules 740 coupled to the processors 710.

The communication module 740 is used for two-way communication. The communication module 740 has at least one cable/fiber optic cable/wireless interface for facilitating communication. The communication interface may represent any interface necessary to communicate with other devices.

Processor 710 may be of any type suitable to the local technical environment and may include, as non-limiting examples, one or more of the following: general purpose computers, special purpose computers, microprocessors, digital Signal Processors (DSPs), and processors based on a multi-core processor architecture. The example device 700 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time with a clock that is synchronized to the master processor.

Memory 720 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memory include, but are not limited to, read Only Memory (ROM) 724, electrically Erasable Programmable Read Only Memory (EPROM), flash memory, hard disks, compact Disks (CD), digital Versatile Disks (DVD), and other magnetic and/or optical storage devices. Examples of volatile memory include, but are not limited to, random Access Memory (RAM) 722 or other volatile memory that cannot be sustained during a power loss.

The computer program 730 includes computer-executable instructions that are executable by an associated processor 710. Program 730 may be stored in ROM 724. Processor 710 may perform various suitable actions and processes by loading program 730 into RAM 722.

Embodiments of the present disclosure may be implemented by the program 730 to cause the example device 700 to perform any of the processes of the present disclosure as described above with reference to the accompanying drawings. Embodiments of the present disclosure may also be implemented in hardware or a combination of software and hardware.

In some embodiments, program 730 may be tangibly embodied on a computer-readable medium. Such computer-readable media may be included in the example device 700 (e.g., the memory 720) or in other storage devices accessible to the example device 700. The example device 700 may read the program 730 from the computer readable medium to the RAM 722 for execution. The computer readable medium may include a variety of tangible non-volatile storage devices, such as ROM, EPROM, flash memory, hard disk, CD, DVD, and the like.

Fig. 8 shows a schematic diagram of an example computer-readable medium 800 according to an embodiment of the disclosure. As shown in fig. 8, the computer readable medium 800 may take the form of a CD or DVD or any other suitable form having a program 730 stored thereon.

In general, the various embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. For example, in some embodiments, various examples of the disclosure (e.g., methods, apparatus, or devices) may be implemented, in part or in whole, on a computer-readable medium. While aspects of the embodiments of the present disclosure are illustrated or described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product stored on a non-transitory computer readable storage medium. The computer program product comprises computer executable instructions, such as program modules, included in a device executing on a physical or virtual processor of a target to perform any of the processes described above with respect to the figures. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between described program modules. Computer-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote memory storage media.

Program code for carrying out the methods of the present disclosure may be written in one or more programming languages. These computer program code may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the computer or other programmable data processing apparatus, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.

In the context of this disclosure, computer program code or related data may be carried by any suitable carrier to enable an apparatus, device or processor to perform the various processes and operations described above. Examples of carriers include signals, computer readable media, and the like.

The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection with one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

In addition, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, although the foregoing description contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method for communication, comprising:

At a first device, transmitting first configuration information for configuring a channel state information reporting mode to a second device, the first configuration information including information regarding whether a dynamic reporting mode is enabled;

Determining a first reporting granularity for channel state information of the second device if the dynamic reporting mode is enabled;

Determining a second reporting granularity for channel state information for the second device if the dynamic reporting mode is not enabled, wherein the second reporting granularity is for the second device to send the channel state information to the first device if the dynamic reporting mode is not enabled; and

And sending second configuration information comprising the first reporting granularity to the second device using low-layer signaling.

2. The method of claim 1, wherein the first reporting granularity is a wideband reporting granularity for transmitting wideband channel state information determined over an entire bandwidth between the first device and the second device or a subband reporting granularity for transmitting subband channel state information determined over each subband of the entire bandwidth between the first device and the second device.

3. The method of claim 1, wherein determining the first reporting granularity comprises:

Receiving a reference signal from the second device; and

The first reporting granularity is determined based on the reference signal.

4. The method of claim 3, wherein determining the first reporting granularity based on the reference signal comprises:

Determining a matrix of channels between the first device and the second device based on the reference signal;

Determining a wideband eigenvector matrix over the entire bandwidth between said first device and said second device based on said matrix;

Determining a subband feature vector matrix on each subband of the overall bandwidth between the first device and the second device based on the matrix;

determining a correlation between the wideband feature vector matrix and the subband feature vector matrix;

Determining the first reporting granularity to be wideband reporting granularity for transmitting wideband channel state information determined over the entire bandwidth between the first device and the second device if the correlation is greater than or equal to a predetermined threshold; and

And if the correlation is less than the predetermined threshold, determining the first reporting granularity as a subband reporting granularity for transmitting subband channel state information determined on each subband of the entire bandwidth between the first device and the second device.

5. The method of claim 1, wherein transmitting the first configuration information comprises:

and sending high-layer signaling comprising the first configuration information to the second device.

6. The method of claim 1, wherein transmitting the second configuration information comprises:

and transmitting channel control information or a control element of medium access control including the second configuration information to the second device.

7. The method of claim 6, wherein the channel control information or control element of medium access control further comprises trigger information to trigger the second device to send the channel state information at the first reporting granularity.

8. The method of claim 1, wherein the first device comprises a network device and the second device comprises a terminal device.

9. A method for communication, comprising:

at a second device, receiving first configuration information from a first device for configuring a channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled;

Receiving, from the first device, lower layer signaling including second configuration information for a first reporting granularity of channel state information for the second device if the first configuration information indicates that the dynamic reporting mode is enabled;

if the first configuration information indicates that the dynamic reporting mode is not enabled,

Obtaining a second reporting granularity from the first configuration information; and

And transmitting the channel state information to the first equipment at the second reporting granularity.

10. The method of claim 9, wherein the first reporting granularity is a wideband reporting granularity for transmitting wideband channel state information determined over an entire bandwidth between the first device and the second device or a subband reporting granularity for transmitting subband channel state information determined over each subband of the entire bandwidth between the first device and the second device.

11. The method of claim 9, wherein receiving the first configuration information comprises:

higher layer signaling including the first configuration information is received from the first device.

12. The method of claim 9, wherein receiving the second configuration information comprises:

control elements of channel control information or medium access control including the second configuration information are received from the first device.

13. The method of claim 12, further comprising:

And if it is determined that the channel control information or medium access control element includes trigger information, transmitting the channel state information to the first device at the first reporting granularity.

14. The method of claim 9, wherein the first device comprises a network device and the second device comprises a terminal device.

15. A first device, comprising:

At least one processor; and

At least one memory storing computer program instructions, the at least one memory and the computer program instructions configured to, with the at least one processor, cause the first device to:

Transmitting first configuration information for configuring a channel state information reporting mode to a second device, the first configuration information including information on whether a dynamic reporting mode is enabled;

16. The first device of claim 15, wherein the first reporting granularity is a wideband reporting granularity for transmitting wideband channel state information determined over an entire bandwidth between the first device and the second device or a subband reporting granularity for transmitting subband channel state information determined over each subband of the entire bandwidth between the first device and the second device.

17. The first device of claim 15, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the first device to determine the first reporting granularity by:

Receiving a reference signal from the second device; and

The first reporting granularity is determined based on the reference signal.

18. The first device of claim 17, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the first device to determine the first reporting granularity based on the reference signal by:

19. The first device of claim 17, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the first device to transmit the first configuration information by:

20. The first device of claim 15, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the first device to send the second configuration information by:

21. The first device of claim 20, wherein the channel control information or control element of medium access control further comprises trigger information to trigger the second device to send the channel state information at the first reporting granularity.

22. The first device of claim 15, wherein the first device comprises a network device and the second device comprises a terminal device.

23. A second device, comprising:

At least one processor; and

At least one memory storing computer program instructions, the at least one memory and the computer program instructions configured to, with the at least one processor, cause the second device to:

Receiving, from a first device, first configuration information for configuring a channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled;

24. The second device of claim 23, wherein the first reporting granularity is a wideband reporting granularity for transmitting wideband channel state information determined over an entire bandwidth between the first device and the second device or a subband reporting granularity for transmitting subband channel state information determined over each subband of the entire bandwidth between the first device and the second device.

25. The second device of claim 23, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the second device to receive the first configuration information by:

26. The second device of claim 23, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the second device to receive the second configuration information by:

27. The second device of claim 26, wherein the at least one memory and the computer program instructions are further configured to, with the at least one processor, cause the second device to:

28. The second device of claim 23, wherein the first device comprises a network device and the second device comprises a terminal device.

29. An apparatus for communication, comprising:

means for transmitting, at a first device, first configuration information for configuring a channel state information reporting mode to a second device, the first configuration information including information regarding whether a dynamic reporting mode is enabled;

Means for determining a first reporting granularity for channel state information of the second device if the dynamic reporting mode is enabled;

Means for determining a second reporting granularity for channel state information for the second device if the dynamic reporting mode is not enabled, wherein the second reporting granularity is for the second device to send the channel state information to the first device if the dynamic reporting mode is not enabled; and

Means for sending low-layer signaling including second configuration information of the first reporting granularity to the second device.

30. An apparatus for communication, comprising:

Means for receiving, at a second device, first configuration information from a first device for configuring a channel state information reporting mode, the first configuration information including information regarding whether a dynamic reporting mode is enabled;

Means for receiving, from the first device, lower layer signaling including second configuration information for a first reporting granularity of channel state information for the second device if the dynamic reporting mode is enabled;

means for obtaining a second reporting granularity from the first configuration information if the first configuration information indicates that the dynamic reporting mode is not enabled; and

Means for transmitting the channel state information to the first device at the second reporting granularity.

31. A computer-readable medium having stored thereon computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any of claims 1 to 8.

32. A computer-readable medium having stored thereon computer-executable instructions that, when executed by one or more processors, cause the one or more processors to perform the method of any of claims 9 to 14.