Channel state information feedback method and apparatus, and communication system

Abstract

Embodiments of the present application provide a channel state information feedback method and apparatus, and a communication system. The channel state information (CSI) feedback apparatus is applied to a user equipment, and the apparatus comprises: a first receiver for receiving first indication information sent by a network device, the first indication information being related to time information regarding a CSI reporting failure, and the first indication information being used to configure the user equipment to reset CSI assistance information and / or retransmit CSI feedback information; and a first transmitter for resetting the CSI assistance information and / or retransmitting the CSI feedback information on the basis of the first indication information, the CSI feedback information being generated on the basis of an artificial intelligence / machine learning (AI / ML) model or function.

Description

Channel state information feedback methods, devices and communication systems Technical Field

[0001] The embodiments of this application relate to the field of communication technology. Background Technology

[0002] In 3GPP Release 18, the application of Artificial Intelligence (AI) and Machine Learning (ML) functions or models to the air interface was studied, including the application of AI / ML functions or models to Channel State Information (CSI) feedback compression. AI / ML-based CSI feedback compression employs a two-sided model, meaning the AI / ML function or model resides on both the User Equipment (UE) side and the Network (NW) side (i.e., the gNB side). In Rel-18, AI / ML-based feedback compression compresses CSI in the spatial frequency domain (SF-AI / ML CSI compression).

[0003] For the bilateral model, on the UE side, the UE performs measurements on a reference signal (e.g., Channel State Information-Reference Signal, CSI-RS) to obtain the radio channel. The UE can then further obtain a feature vector of the radio channel, which is used as input to the UE-side AI / ML function or model, i.e., the encoder input, to compress the CSI. The UE then reports the encoder output as CSI feedback or sends it to the gNB. The gNB uses the received CSI feedback as input to its own AI / ML function or model, i.e., the decoder input. After decompression using the decoder, the decoder outputs the reconstructed CSI. This scenario of compressing channel state information in both the spatial and frequency domains is called Case-0.

[0004] In Release 19, a further study was conducted on the spatiotemporal frequency domain-based AI / ML-based CSI compression feedback enhancement sub-use case (TSF-AI / ML CSI compression). This sub-use case utilizes historical CSI information through AI / ML methods (e.g., RNN / GRU / LSTM models) to assist in CSI compression at the current moment, aiming to achieve a lower compression ratio or higher feedback accuracy.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Summary of the Invention

[0006] In scenarios where historical CSI information is used to aid in current CSI compression, both the UE and NW sides need to update CSI auxiliary information at each CSI feedback time. In particular, the NW side update requires data based on the feedback CSI information. If a CSI is discarded, or an uplink UCI (uplink control information) transmission error occurs, the NW side cannot obtain the feedback CSI information, and the CSI auxiliary information cannot be updated. In this case, the UE can retransmit the discarded CSI or reset the CSI auxiliary information to synchronize the CSI auxiliary information between the UE and NW sides, thereby ensuring the performance of CSI compression feedback.

[0007] The inventors discovered that in the prior art, there are some difficulties in UE retransmitting CSI or resetting CSI auxiliary information. For example, the existing protocol does not support the NW side instructing the UE side to report CSI transmission failure or reset CSI auxiliary information, nor does it support CSI retransmission. In addition, due to the lack of time information, the UE does not know which time's CSI should be retransmitted or which time's CSI auxiliary information should be reset.

[0008] To address one or more of the aforementioned problems, embodiments of this application provide a channel state information feedback method, apparatus, and communication system.

[0009] According to one aspect of the embodiments of this application, a channel state information (CSI) feedback device is provided, applied to a terminal device, the device comprising:

[0010] A first receiver receives first indication information sent by a network device. This first indication information is related to the time information of a CSI reporting failure. Furthermore, the first indication information configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information.

[0011] A first transmitter resets CSI auxiliary information and / or retransmits CSI feedback information based on the first indication information, the CSI feedback information being generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0012] According to another aspect of the embodiments of this application, a channel state information (CSI) feedback device is provided, applied to a network device, the device comprising:

[0013] A second transmitter sends a first indication message to a terminal device. This first indication message is related to the time information of a CSI reporting failure, and configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information.

[0014] The second receiver receives information sent by the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information according to the first instruction information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0015] One of the beneficial effects of this application embodiment is that: the terminal device receives first indication information related to the time information of CSI reporting failure, and resets CSI auxiliary information and / or retransmits CSI feedback information based on the first indication information. Thus, the terminal device can reset CSI auxiliary information and / or retransmit CSI feedback information according to the time of CSI reporting failure, which can synchronize the CSI auxiliary information on the terminal device side and the network device side, thereby ensuring the performance of CSI compressed feedback.

[0016] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the spirit and scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents.

[0017] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0018] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0019] The elements and features described in one drawing or embodiment of this application may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, similar reference numerals denote corresponding parts in several drawings and can be used to indicate corresponding parts used in more than one embodiment.

[0020] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application;

[0021] Figure 2 is a schematic diagram of AI / ML-based CSI compressed feedback enhancement in the spatiotemporal frequency domain;

[0022] Figure 3 is a schematic diagram showing the asynchrony of CSI auxiliary information between the UE side and the NW side caused by CSI reporting failure;

[0023] Figure 4 is a schematic diagram of a channel state information feedback method according to an embodiment of this application;

[0024] Figure 5 is a schematic diagram of a terminal device resetting CSI auxiliary information;

[0025] Figure 6 is another schematic diagram of the channel state information feedback method;

[0026] Figure 7 is another schematic diagram of the channel state information feedback method;

[0027] Figure 8 is a schematic diagram of a channel state information feedback method according to an embodiment of the second aspect of this application;

[0028] Figure 9 is a schematic diagram of a channel state information feedback device according to an embodiment of this application;

[0029] Figure 10 is a schematic diagram of a channel state information feedback device according to an embodiment of this application;

[0030] Figure 11 is a schematic block diagram of the electronic device. Detailed Implementation

[0031] Referring to the accompanying drawings, the foregoing and other features of this application will become apparent from the following description. Specific embodiments of this application are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this application can be adopted. It should be understood that this application is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims. Various embodiments of this application are described below with reference to the accompanying drawings. These embodiments are merely exemplary and not intended to limit the scope of this application.

[0032] In the embodiments of this application, the terms "first," "second," etc., are used to distinguish different elements by name, but do not indicate the spatial arrangement or chronological order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one or more of the terms listed in association and all combinations thereof. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0033] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0034] In the embodiments of this application, the term "communication network" or "wireless communication network" may refer to a network that conforms to any of the following communication standards, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0035] Furthermore, communication between devices in a communication system can be carried out according to communication protocols at any stage, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), 6G and future communication, and / or other currently known or future communication protocols.

[0036] In the embodiments of this application, the term "network device" refers, for example, to a device in a communication system that connects a terminal device to a communication network and provides services to that terminal device. Network devices may include, but are not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

[0037] The term "base station" can include, but is not limited to, NodeBs (or NBs), evolved NodeBs (eNodeBs or eNBs), 5G base stations (gNBs), 6G base stations, and future base stations, etc. It can also include Remote Radio Heads (RRHs), Remote Radio Units (RRUs), relays, or low-power nodes (e.g., femto, pico, etc.). The term "base station" can encompass some or all of its functions, and each base station can provide communication coverage to a specific geographic area. The term "cell" can refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0038] In the embodiments of this application, the terms "User Equipment" (UE) or "Terminal Equipment" (TE) refer, for example, to a device that accesses a communication network and receives network services through a network device. User equipment can be fixed or mobile, and may also be referred to as a mobile station (MS), terminal, user, subscriber station (SS), access terminal (AT), station, mobile terminal (MT), etc.

[0039] The terminal device may include, but is not limited to, the following devices: cellular phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, machine-type communication device, laptop computer, cordless phone, smartphone, smartwatch, digital camera, etc.

[0040] For example, in scenarios such as the Internet of Things (IoT), user devices can also be machines or devices used for monitoring or measurement, including but not limited to: machine-type communication (MTC) terminals, vehicle-mounted communication terminals, device-to-device (D2D) terminals, machine-to-machine (M2M) terminals, terminals that support sidelink communication, and so on.

[0041] Furthermore, the terms "network side" or "network equipment side" refer to one side of the network, which can be a base station or include one or more network devices as described above. The terms "user side," "terminal side," or "terminal equipment side" refer to the side of the user or terminal, which can be a UE or include one or more terminal devices as described above. Unless otherwise specified, "equipment" can refer to either network equipment or terminal equipment.

[0042] Without causing confusion, the terms “uplink control signal” and “uplink control information (UCI)” or “physical uplink control channel (PUCCH)” are interchangeable, as are the terms “uplink data signal” and “uplink data information (PUSCH)”.

[0043] The terms “downlink control signal” and “downlink control information (DCI)” or “physical downlink control channel (PDCCH)” are interchangeable, as are the terms “downlink data signal” and “downlink data information (PDSCH)” or “physical downlink shared channel (PDSCH)”.

[0044] Additionally, uplink signals can include uplink data signals and / or uplink control signals and / or PRACH and / or SRS (sounding reference signal), etc., and can also be referred to as uplink transmission (UL transmission), uplink information, or uplink channel. Sending / receiving uplink transmission on uplink resources can be understood as using that uplink resource to send / receive the uplink transmission. Downlink signals can include downlink data signals and / or downlink control signals and / or synchronization signals (SS, such as PSS / SSS) and / or broadcast channel (PBCH) and / or SSB (SS / PBCH block, including PSS, SSS, and PBCH and their DMRS) and / or CSI-RS, etc., and can also be referred to as downlink transmission (DL transmission), downlink information, or downlink channel. Sending / receiving downlink transmission on downlink resources can be understood as using that downlink resource to send / receive the downlink transmission.

[0045] In the embodiments of this application, higher-layer signaling may be, for example, Radio Resource Control (RRC) signaling; RRC signaling may include, for example, RRC messages, such as broadcast / public RRC messages / signaling (e.g., Master Information Block (MIB), System Information (SI), Private RRC messages / signaling; or RRC Information Element (RRC IE); or information fields (or information fields included in information fields) included in RRC messages or RRC Information Elements. Higher-layer signaling may also be, for example, Medium Access Control (MAC) signaling; or referred to as MAC control element (MAC CE). However, this application is not limited to these.

[0046] In the embodiments of this application, "at least one" and "one or more" can be used interchangeably, and "multiple" and "more than one" can be used interchangeably. "Multiple" means at least two, or two or more.

[0047] In this application embodiment, "predefined" refers to what is specified by the protocol or determined according to the rules specified by the protocol, and does not require additional configuration. "Configuration / instruction" refers to what the network device directly or indirectly configures / instructs through higher-layer signaling and / or physical layer signaling. Configuration / instruction can be achieved by introducing higher-layer parameters into the higher-layer signaling. Higher-layer parameters refer to information fields and / or information elements / information units / information cells (IEs) in the higher-layer signaling. Physical layer signaling refers to, for example, control information (DCI) carried by the physical downlink control channel or control information carried by the sequence, but is not limited to these.

[0048] For ease of description, the following text uses a base station as an example of an access network device.

[0049] In the following explanation, without causing confusion, “if…”, “in the case of…” and “when…” can be used interchangeably.

[0050] The following examples illustrate the scenarios of embodiments of this application, but this application is not limited thereto.

[0051] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application, illustrating the case of a terminal device and a network device as examples. As shown in Figure 1, the communication system 100 may include a network device 101, a terminal device 102, and a terminal device 103. For simplicity, Figure 1 only illustrates the case of two terminal devices and one network device, but the embodiments of this application are not limited to this.

[0052] In this embodiment of the application, network device 101, terminal device 102, and terminal device 103 can transmit existing services or services that can be implemented in the future. For example, these services may include, but are not limited to: enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), ultra-reliable and low-latency communication (URLLC), and related communications of terminal devices with reduced capabilities, etc.

[0053] Terminal devices 102 and 103 can be in RRC_IDLE, RRC_INACTIVE, or RRC_CONNECTED states. Terminal devices 102 and 103 can also communicate with network device 101. For example, taking terminal device 102 as an example, terminal device 102 can send data to network device 101 or perform data retransmission. Network device 101 can send paging messages to terminal device 102 or send data to terminal device 102, and terminal device 102 can receive data sent by network device 101. Furthermore, different terminal devices can also communicate with each other; for example, terminal device 102 and terminal device 103 can exchange data.

[0054] It is worth noting that Figure 1 shows that both terminal device 102 and terminal device 103 are within the coverage area of ​​network device 101, but this application is not limited to this. Terminal device 102 and terminal device 103 may both be outside the coverage area of ​​network device 101, or one of terminal device 102 and terminal device 103 may be within the coverage area of ​​network device 101 while the other is outside the coverage area of ​​network device 101.

[0055] In the embodiments of this application, one or more AI / ML models can be configured and run in network devices and / or terminal devices. AI / ML models can be used for various signal processing functions in wireless communication, such as CSI prediction, CSI compression, beam prediction, positioning management, etc.; this application is not limited thereto.

[0056] In Release 19, a further study was conducted on the spatiotemporal frequency domain-based AI / ML-based CSI compression feedback enhancement sub-use case (TSF-AI / ML CSI compression). This sub-use case utilizes historical CSI information through AI / ML functions or models (e.g., RNN / GRU / LSTM models) to assist in CSI compression at the current moment, aiming to achieve a lower compression ratio or higher feedback accuracy.

[0057] Figure 2 is a schematic diagram of feedback enhancement for AI / ML-based CSI compression (TSF-AI / ML CSI compression) in the spatiotemporal frequency domain. The scenario in Figure 2 can also be referred to as Case-2.

[0058] As shown in Figure 2, on the UE side, the CSI measurement results are processed by matrix decomposition (e.g., SVD (Singular Value Decomposition) or SVD (Eigenvalue Decomposition)) to obtain feature vectors (e.g., V(t), V(t+d), V(t+2d), V(t+3d)). These feature vectors are then input to the encoder, which generates CSI feedback information. On the network side, the decoder decodes the CSI feedback information sent by the UE to generate reconstructed CSI.

[0059] As shown in Figure 2, the UE side and / or the network side can use time-domain information (also known as historical CSI information, side information, or similar names) to assist in the current CSI compression and / or decompression, aiming to obtain a higher compression ratio or higher feedback accuracy.

[0060] In the embodiments of this application, CSI compression can also be called "CSI encoding", "CSI generation" or similar names, and the results of CSI compression, CSI encoding or CSI generation operations are called CSI feedback information, CSI reporting information or similar names.

[0061] In the embodiments of this application, CSI decompression may also be referred to as "CSI decoding", "CSI reconstruction", "CSI recovery", "CSI rebuilding" or similar names.

[0062] In the embodiments of this application, the AI / ML model may also be referred to as an AI / ML method, AI / ML unit, AI / ML function, or AI / ML element, or similar names. On the UE side, the AI / ML model may also be referred to as an encoder, CSI generation part, or similar names. On the network device side, the AI / ML model may also be referred to as a decoder, CSI reconstruction part, or similar names.

[0063] In the embodiments of this application, one or more AI / ML functions or models may be configured and run in the network device and / or terminal device. The AI / ML functions or models can be used for various signal processing functions of wireless communication, such as channel state information (CSI) prediction, CSI compression, beam prediction, positioning management, etc.; this application is not limited thereto.

[0064] In the various embodiments of this application, the following terms have the same meaning and can be used interchangeably: AI / ML, artificial intelligence, artificial intelligence, or machine learning.

[0065] In various embodiments of this application, AI / ML functionality / model may also be referred to as AI / ML function or model, artificial intelligence or machine learning function or model, artificial intelligence function or model, etc., which have the same meaning and can be used interchangeably in this application.

[0066] It should be noted that the use cases applicable to the operation and processing methods of AI / ML functions or models in the embodiments of this application include, but are not limited to, CSI compression feedback. However, those skilled in the art will understand that the embodiments of this application are also applicable to various other use cases and / or scenarios that apply AI / ML functions or models.

[0067] First aspect of the embodiments

[0068] For Case-2, the CSI auxiliary information on the UE and NW sides needs to be synchronized. That is, at each CSI reporting time, the CSI auxiliary information on both sides must be updated synchronously. The UE-side CSI auxiliary information update depends on the measured CSI, while the NW-side CSI auxiliary information update depends on the CSI feedback from the UE side (i.e., CSI feedback information). This implies the need for ideal or error-free UCI feedback. If CSI reporting fails, or an uplink UCI transmission error occurs, the NW side cannot obtain the feedback CSI information, and the CSI auxiliary information cannot be updated. This will cause the CSI auxiliary information on the UE and NW sides to be out of sync, affecting the performance of CSI compression feedback.

[0069] Figure 3 is a schematic diagram illustrating the asynchrony of CSI auxiliary information between the UE side and the NW side caused by CSI reporting failure. As shown in Figure 3, the failure of CSI reporting or UCI loss at time (t+d) results in inaccurate or failed decoding of the CSI decoding result V'(t+d) for time (t+d) on the network side. Therefore, the network side cannot generate CSI auxiliary information for time (t+2d).

[0070] Table 1 shows the solutions for CSI reporting failures or UCI loss.

[0071] Table 1

[0072] However, existing protocols do not support the NW side instructing the UE to report CSI transmission failure or reset CSI auxiliary information, nor do they support CSI retransmission. Therefore, the existing signaling needs to be enhanced. Considering the transmission delay of the indication information, the UE not only needs to know whether CSI reporting failed, but also needs to know at what time the transmission failed. Due to the lack of time information, the UE does not know which time's CSI should be retransmitted, or which time's CSI auxiliary information should be reset to. To carry the specific time information of CSI transmission failure, the existing signaling also needs to be enhanced.

[0073] To address the aforementioned issues, embodiments of this application provide a channel state information feedback method, which is applied to a terminal device. The description will now proceed from the terminal device side and / or the network device side.

[0074] Figure 4 is a schematic diagram of a channel state information feedback method according to an embodiment of this application. As shown in Figure 4, from the perspective of the terminal device (UE), the method includes:

[0075] Operation 401: The terminal device receives first indication information sent by the network device. This first indication information is related to the time information of CSI reporting failure, and the first indication information configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information; and

[0076] Operation 402: The terminal device resets the CSI auxiliary information and / or retransmits the CSI feedback information according to the first instruction information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0077] According to this application, the terminal device receives first indication information related to the time information of CSI reporting failure, and resets CSI auxiliary information and / or retransmits CSI feedback information based on the first indication information. Thus, the terminal device can reset CSI auxiliary information and / or retransmit CSI feedback information according to the time of CSI reporting failure, and can synchronize CSI auxiliary information on the terminal device side and network device side, thereby ensuring the performance of CSI compressed feedback.

[0078] In some embodiments, the AI / ML model on the UE side and the AI / ML model on the network side may correspond or match, i.e., a two-sided model. This application is not limited to this; the AI / ML model may also be used only on the UE side or only on the network side. In the following text, unless otherwise specified, the AI / ML model refers to the UE-side model and / or the network-side model.

[0079] In some embodiments, an AI function or model refers to an AI / ML feature or feature group enabled by a configuration that is supported based on conditions indicated by the capabilities of the end device.

[0080] For example, an AL / ML function or model can be one or more functions or models, or it can be one or more logical models, or it can be one or more sub-functions, or it can be one or more features, or it can be one or more feature groups.

[0081] In some embodiments, as shown in FIG4, the channel state information (CSI) feedback method may further include the following operations:

[0082] Operation 403: The terminal device reports its capabilities, such as AI / ML-related capabilities and / or the terminal device's support for AI / ML-based CSI compression feedback functions. In addition, it may also include the maximum number of time slots / time slots that the terminal device can store for CSI auxiliary information.

[0083] Operation 404: The terminal device is configured with CSI-RS resources and reporting configuration by the network device, and the AI / ML-based CSI compression feedback function is activated. For example, based on the terminal device's capability reporting (i.e., the capabilities reported by the terminal device), the network device configures the corresponding CSI-RS resources and reporting configuration for the terminal device, and activates the AI / ML-based CSI compression feedback function. This CSI feedback function compresses the CSI information at the current moment based on CSI auxiliary information, which is the Case-2 use case of Rel-18.

[0084] Operation 405: The terminal device receives a reference signal (e.g., CSI-RS) sent by the network device, measures and obtains the downlink channel CSI, compresses the CSI based on the AI / ML model on the terminal device side, and sends CSI feedback information; for example, the network device sends a CSI-RS reference signal, the terminal device receives the CSI-RS reference signal from the network device according to the configuration information, measures the received CSI-RS to obtain the downlink channel CSI, compresses the CSI based on the AI / ML model on the terminal device side, and feeds back the compressed CSI information through the Physical Uplink Shared Channel (PUSCH) (i.e., sends CSI feedback information).

[0085] Operation 406: The network device receives the CSI information fed back by the terminal device and reconstructs the CSI information through the AI / ML model on the network device side for Physical Downlink Shared New Channel (PDSCH) scheduling.

[0086] When the network device fails to receive the CSI information fed back by the terminal device, the network device may send a first indication message to the terminal device (corresponding to operation 401), and the terminal device may reset the CSI auxiliary information and / or retransmit the CSI feedback information according to the first indication message (corresponding to operation 402).

[0087] The following describes operations 401 and 402 of this application in further detail with reference to specific embodiments.

[0088] Example 1

[0089] In Example 1, the first instruction information configuration terminal device resets CSI auxiliary information.

[0090] In Embodiment 1, the first indication information is carried in at least one of Downlink Control Information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, a first Downlink Control Information format (DCI format), Radio Resource Control (RRC) signaling, and Media Access Control Element (MAC-CE) signaling, wherein the first Downlink Control Information format (DCI format) may be a new Downlink Control Information format. The terminal device determines the time (e.g., time slot or moment) of CSI reporting failure based on the first indication information, and resets the CSI auxiliary information according to the determined time.

[0091] When the first indication information is carried in the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, the field or item used to carry the first indication information can be:

[0092] Option 1: A new field or domain;

[0093] Option 2: Reinterpret or define existing fields or domains in DCI 1_1 / 1_2 / 0_1 / 0_2 signaling to carry first indication information. The field or domain used to carry the first indication information can be a single field or a combination of multiple fields or domains.

[0094] In some examples, the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling can be a data service scheduling DCI, and the first indication information is carried on a first field or field, which is a newly introduced field or field in the DCI.

[0095] In other examples, the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling is a non-data service scheduling DCI, such as a non-downlink data service scheduling DCI 1_1 / 1_2 (DCI 1_1 / 1_2 without DL assignment), or a non-uplink data service scheduling DCI 0_1 / 0_2 (DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH). The fields or areas in this downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling used for PDSCH or PUSCH data service scheduling are multiplexed to carry this first indication information. For example, the multiplexed fields or areas may be modulation and coding scheme (MCS), hybrid automatic repeat request (HARQ), or antenna port-related fields or areas.

[0096] In Embodiment 1, the terminal device can determine the time or time slot of the CSI reporting failure based on the first indication information. The terminal device resets the CSI auxiliary information to the most recent available historical CSI auxiliary information from that time or time slot, or the terminal device resets the CSI auxiliary information to a default value (e.g., all zeros).

[0097] Figure 5 is a schematic diagram of a terminal device resetting CSI auxiliary information. As shown in Figure 5, the terminal device receives a first indication message from the network device in time slot #6. This first indication message indicates that the terminal device failed to report CSI in time slot #3 (e.g., the CSI feedback information sent in time slot #3 was not successfully received by the network device). Based on this first indication message, the terminal device resets the CSI auxiliary information of the current time slot (e.g., time slot #6) to the historical CSI auxiliary information closest to time slot #3, for example, to the CSI auxiliary information of time slot #2.

[0098] In Embodiment 1, the terminal device (e.g., in operation 402) can receive signaling instructing the terminal device to reset CSI auxiliary information. Therefore, the time of CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset (K_offset) from the time or time slot K at which the signaling instructs the terminal device to reset CSI auxiliary information is received; that is, the time of CSI reporting failure = K - K_offset. The signaling instructing the terminal device to reset CSI auxiliary information can be DCI signaling.

[0099] In Embodiment 1, the first indication information may be the aforementioned time or time slot offset value (K_offset), or the first indication information may be carried by the aforementioned time or time slot offset value (K_offset). For example, the first indication information may be a time or time slot offset value (K_offset) configured by the network device for the terminal device; or the first indication information may be two or more time or time slot offset values ​​(K_offset) configured by the network device for the terminal device.

[0100] The first indication information is carried in at least one of the following: downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, first downlink control information format (DCI format), radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling. That is, the network device can configure the terminal device with the one time or slot offset value (K_offset) or the two or more time or slot offset values ​​(K_offset) through at least one of the following: downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, first downlink control information format (DCI format), radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling.

[0101] In cases where the network device configures two or more time slot offset values ​​(K_offset) for the terminal device, the terminal device can receive an activation indication sent by the network device to activate one time slot offset value (K_offset). This activation indication can be MAC-CE signaling or DCI signaling. For example, if the activation indication is DCI signaling, it can be the same signaling as the signaling used to instruct the terminal device to reset CSI auxiliary information; that is, the DCI signaling activates one time slot offset value (K_offset) and instructs the terminal device to reset CSI auxiliary information. Alternatively, the activation indication and the signaling used to instruct the terminal device to reset CSI auxiliary information can be different signaling.

[0102] In Example 1, the bit width (e.g., number of bits) of the time slot offset value (K_offset) is determined based on the reporting capability of the terminal device, that is, based on the maximum amount of CSI auxiliary information and / or CSI feedback information that the terminal device can cache.

[0103] In Embodiment 1, the terminal device resets the CSI auxiliary information at a predetermined time or time slot after receiving a signaling instruction (or time slot K) instructing the terminal device to reset the CSI auxiliary information. The time difference between time slot K and the predetermined time slot is denoted as delta_K. delta_K can be preset or pre-configured; for example, the terminal device can reset the CSI auxiliary information at a predetermined time or time slot K + delta_K. In some examples, delta_K can be equal to 0 or other values.

[0104] The Channel State Information (CSI) feedback method of Embodiment 1 will be illustrated below with an example.

[0105] Figure 6 is another schematic diagram of the Channel State Information (CSI) feedback method. In the example shown in Figure 6, the first indication information is carried on RRC and / or MAC-CE signaling, and the terminal device receives the RRC and / or MAC-CE and is configured to reset the CSI auxiliary information.

[0106] As shown in Figure 6, the Channel State Information (CSI) feedback method in Example 1 includes the following operations:

[0107] Operation 601: The first indication information is carried in RRC and / or MAC-CE signaling, and the network device configures a time / time slot offset value K_offset for the terminal device. For example, the network device configures one time or time slot offset value K_offset for the terminal device; or, the network device configures multiple time or time slot offset values ​​K_offset for the terminal device, and activates or determines one of the time or time slot offset values ​​K_offset by an activation indication (e.g., MAC-CE or DCI).

[0108] Operation 602: The network device sends a CSI-RS reference signal to the terminal device;

[0109] Operation 603: The terminal device measures CSI-RS, acquires CSI, compresses CSI based on the AI / ML model on the terminal device side, and sends CSI feedback information;

[0110] Operation 604: The network device receives the CSI information fed back by the terminal device and reconstructs the CSI information through the AI / ML model on the network device side for Physical Downlink Shared New Channel (PDSCH) scheduling;

[0111] Operation 605: At time or time slot K1, the terminal device failed to report CSI (i.e., CSI reporting failed).

[0112] Operation 606: At time or time slot K, the network device instructs the terminal device to reset the CSI auxiliary information via DCI signaling (i.e., signaling used to instruct the terminal device to reset the CSI auxiliary information);

[0113] Operation 607: The terminal device determines the time or time slot K1 = K - K_offset of the CSI reporting failure based on the time or time slot K of receiving the DCI signaling (i.e., the signaling used to instruct the terminal device to reset the CSI auxiliary information) and K_offset;

[0114] Operation 608: The terminal device resets the CSI auxiliary information at a predetermined time or time slot K2 after receiving the DCI signaling (i.e., the signaling used to instruct the terminal device to reset the CSI auxiliary information) at the time or time slot K, where K2 = K + delta_K. For example, the terminal device resets the CSI auxiliary information at the current time to the most recently available historical CSI auxiliary information at the time or time slot K1 = K - K_offset.

[0115] Example 2

[0116] In Example 2, the first instruction information configures the terminal device to retransmit CSI feedback information.

[0117] In Embodiment 2, the first indication information is carried in at least one of Downlink Control Information (DCI) 0_1 / 0_2 signaling, Radio Resource Control (RRC) signaling, and Media Access Control Element (MAC-CE) signaling. The terminal device determines the time (e.g., time slot or moment) of the CSI reporting failure based on the first indication information, and retransmits the CSI feedback information according to the determined time.

[0118] When the first indication information is carried in downlink control information (DCI) 0_1 / 0_2 signaling, the field or item used to carry the first indication information can be:

[0119] Option 1: A new field or domain;

[0120] Option 2: Reinterpret or define existing fields or domains in DCI 0_1 / 0_2 signaling to carry first indication information. The field or domain used to carry the first indication information can be a single field or a combination of multiple fields or domains.

[0121] In some examples, the downlink control information (DCI) 0_1 / 0_2 signaling can be the uplink data service scheduling DCI, with the first indication information carried on a second field or domain, which is a newly introduced field or domain in the DCI.

[0122] In other examples, the downlink control information (DCI) 0_1 / 0_2 signaling is a DCI without uplink data service scheduling (DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH). The fields or areas in this downlink control information (DCI) 0_1 / 0_2 signaling used for PUSCH data service scheduling are multiplexed to carry this first indication information. For example, the multiplexed fields or areas could be modulation and coding scheme (MCS), hybrid automatic repeat request (HARQ), or antenna port-related fields or areas.

[0123] In Embodiment 2, the terminal device can determine the time or time slot of the CSI reporting failure based on the first indication information. Furthermore, the terminal device can resend the CSI feedback information reported at the time of the CSI reporting failure to the network device. Thus, after successfully receiving the CSI feedback information, the network device can update the CSI auxiliary information on the network device side.

[0124] In Embodiment 2, the terminal device (e.g., in operation 402) can receive signaling instructing the terminal device to retransmit CSI feedback information. The time of CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset (K_offset) from the time or time slot K at which the signaling instructs the terminal device to retransmit CSI feedback information is received; that is, the time of CSI reporting failure = K - K_offset. The signaling instructing the terminal device to retransmit CSI feedback information can be DCI signaling.

[0125] In Embodiment 2, the first indication information may be the aforementioned time or time slot offset value (K_offset), or the first indication information may be carried by the aforementioned time or time slot offset value (K_offset). For example, the first indication information may be a time or time slot offset value (K_offset) configured by the network device for the terminal device; or the first indication information may be two or more time or time slot offset values ​​(K_offset) configured by the network device for the terminal device.

[0126] The first indication information is carried in at least one of the downlink control information (DCI) 0_1 / 0_2 signaling, radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling. That is, the network device can configure the terminal device with the one time or slot offset value (K_offset) or the two or more time or slot offset values ​​(K_offset) through at least one of the downlink control information (DCI) 0_1 / 0_2 signaling, radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling.

[0127] In cases where the network device configures two or more time slot offset values ​​(K_offset) for the terminal device, the terminal device can receive an activation indication sent by the network device to activate one time slot offset value (K_offset). This activation indication can be MAC-CE signaling or DCI signaling. For example, if the activation indication is DCI signaling, it can be the same signaling as the signaling instructing the terminal device to retransmit CSI feedback information; that is, the DCI signaling activates one time slot offset value (K_offset) and instructs the terminal device to retransmit CSI feedback information. Alternatively, the activation indication can be a different signaling than the signaling instructing the terminal device to reset CSI auxiliary information.

[0128] In some examples of Embodiment 2, the terminal device can receive one or more first CSI reporting configurations sent by the network device. These first CSI reporting configurations are used to configure a time or time slot offset value K_offset for the terminal device. Where the network device configures multiple first CSI reporting configurations for the terminal device, each first CSI reporting configuration can carry one K_offset, and the K_offset values ​​in each first CSI reporting configuration are different from each other.

[0129] The terminal device can also receive DCI 0_1 / 0_2 signaling sent by the network device. The Channel State Information Request (CSI request) field in this DCI 0_1 / 0_2 signaling triggers a first CSI reporting configuration to retransmit CSI feedback information. Therefore, this DCI 0_1 / 0_2 signaling can serve as an instruction for the terminal device to retransmit CSI feedback information. Furthermore, this DCI 0_1 / 0_2 also functions as the aforementioned activation indication. Based on the time or time slot K of receiving the DCI 0_1 / 0_2 signaling and the K_offset in the first CSI reporting configuration triggered by the DCI 0_1 / 0_2 signaling, the terminal device determines the time slot or time of the CSI reporting failure as K-K_offset, and then retransmits the CSI feedback information for the time slot or time K-K_offset.

[0130] In the above example, at least one first CSI reporting configuration can be associated with a corresponding second CSI reporting configuration. For example, the first CSI reporting configuration is a newly introduced CSI reporting configuration, and the second CSI reporting configuration is an existing (legacy) CSI reporting configuration. The second CSI reporting configuration may include AI / ML-based CSI feedback and / or AI / ML-based encoder output bit width, etc. Furthermore, the first CSI reporting configuration may not be associated with a Channel State Information Reference Signal (CSI-RS) resource configuration.

[0131] Therefore, the terminal device can retransmit the CSI feedback information corresponding to the first CSI reporting configuration based on the second CSI reporting configuration associated with the first CSI reporting configuration (e.g., CSI feedback quantity information). The CSI feedback information corresponding to the first CSI reporting configuration refers, for example, the CSI feedback information sent or to be sent based on the time slot or moment K-K_offset determined by the K_offset (i.e., the activated K_offset) in the triggered first CSI reporting configuration when the CSI reporting failed.

[0132] In Example 2, the bit width (e.g., number of bits) of the time slot offset value (K_offset) is determined based on the reporting capability of the terminal device, that is, based on the maximum amount of CSI auxiliary information and / or CSI feedback information that the terminal device can cache.

[0133] In Embodiment 2, the terminal device retransmits the CSI feedback information at a predetermined time or time slot after receiving the signaling instruction to retransmit the CSI feedback information at the time or time slot K. The time difference between time slot K and the predetermined time or time slot is denoted as delta_K. delta_K can be preset or pre-configured. For example, the terminal device can retransmit the CSI feedback information at the predetermined time or time slot K + delta_K. In some examples, delta_K can be equal to 0 or other values.

[0134] The following examples illustrate the method for a terminal device in Embodiment 2 to retransmit CSI feedback information based on a first indication message. The first indication message is carried on at least one of RRC, MAC-CE, and DCI signaling. Upon receiving at least one of the RRC, MAC-CE, and DCI signaling, the terminal device determines to retransmit the CSI feedback information.

[0135] In some cases, the initial indication information is carried in RRC signaling, and the network device configures a time or time slot offset value K_offset for the terminal device. The network device instructs the terminal device to retransmit the CSI feedback information via DCI signaling (e.g., DCI 0_1 / 0_2 signaling). The terminal device determines the specific time / time slot of the CSI reporting failure as K-K_offset based on the time or time slot K and K_offset of the received DCI signaling. The terminal device resends the CSI feedback information reported at time / time slot K-K_offset to the network device. After successfully receiving the CSI information, the network device completes the update of the auxiliary CSI information.

[0136] In other examples, the network device configures multiple time / slot offset values ​​K_offset for the terminal device via RRC, and activates / determines one of these K_offset values ​​via MAC-CE or DCI. The network device instructs the terminal device to reset the CSI auxiliary information via DCI signaling. The terminal device determines the specific time / slot of the CSI transmission failure report as K-K_offset based on the received time / slot K and K_offset from the DCI report. The terminal device resends the CSI feedback information reported at time / slot K-K_offset to the network device. After successfully receiving this CSI information, the network device completes the update of the auxiliary CSI information.

[0137] In some other examples, the initial indication information is carried in RRC signaling. A new CSI reporting configuration (i.e., a first CSI reporting configuration) can be introduced to instruct the terminal device to retransmit CSI feedback information, and a new field / domain can be introduced in this first CSI reporting configuration to indicate the time / slot information for CSI reporting retransmission. For example, a time / slot offset value K_offset can be introduced into the first CSI reporting configuration. The network device configures one or more different first CSI reporting configurations for the terminal device, with different K_offset values ​​in each configuration. The terminal device receives DCI 0_1 / 0_2 from the network device, where the CSI request field / domain triggers the corresponding first CSI reporting configuration to retransmit the corresponding CSI feedback information.

[0138] The first CSI reporting configuration can be associated with a second (e.g., legacy) CSI reporting configuration, and the first CSI reporting configuration does not need to be associated with a CSI-RS resource configuration. When a first CSI reporting configuration is triggered, the terminal device can retransmit the CSI feedback information corresponding to the first CSI reporting configuration based on the second CSI reporting configuration associated with the first CSI reporting configuration.

[0139] In the example above in Embodiment 2, the bit width (number of bits) of K_offset can be determined based on the terminal's reporting capabilities, that is, the maximum amount of auxiliary CSI information and / or CSI feedback information that the terminal device can cache is determined.

[0140] The Channel State Information (CSI) feedback method of Embodiment 2 will be illustrated below with an example.

[0141] Figure 7 is another schematic diagram of the Channel State Information (CSI) feedback method.

[0142] As shown in Figure 7, the Channel State Information (CSI) feedback method in Example 2 includes the following operations:

[0143] Operation 701: The first indication information is carried in RRC and / or MAC-CE signaling, and the network device configures a time / slot offset value K_offset for the terminal device. For example, the network device configures one time or slot offset value K_offset for the terminal device; or, the network device configures multiple time or slot offset values ​​K_offset for the terminal device, and activates or determines one of the time or slot offset values ​​K_offset by an activation indication (e.g., MAC-CE or DCI).

[0144] Operation 702: The network device sends a CSI-RS reference signal to the terminal device;

[0145] Operation 703: The terminal device measures CSI-RS, acquires CSI, compresses CSI based on the AI / ML model on the terminal device side, and sends CSI feedback information;

[0146] Operation 704: The network device receives the CSI information fed back by the terminal device and reconstructs the CSI information through the AI / ML model on the network device side for Physical Downlink Shared New Channel (PDSCH) scheduling;

[0147] Operation 705: At time or time slot K1, the terminal device failed to report CSI (i.e., CSI reporting failed).

[0148] Operation 706: At time or time slot K, the network device instructs the terminal device to retransmit the CSI feedback information via DCI signaling (i.e., signaling used to instruct the terminal device to retransmit the CSI feedback information). For example, the DCI signaling may be DCI 0_1 / 0_2 signaling. The Channel State Information Request (CSI request) field or field of the DCI 0_1 / 0_2 signaling triggers the first CSI reporting configuration to retransmit the CSI feedback information.

[0149] Operation 707: The terminal device determines the time or time slot K1 = K - K_offset of the CSI reporting failure based on the time or time slot K of receiving the DCI signaling (i.e., the signaling used to instruct the terminal device to retransmit the CSI feedback information) and K_offset;

[0150] Operation 708: The terminal device retransmits the CSI feedback information at time or time slot K2 at a predetermined time or time slot K2 after receiving the DCI signaling (i.e., the signaling used to instruct the terminal device to retransmit the CSI feedback information), where K2 = K + delta_K.

[0151] According to an embodiment of this application, the terminal device receives first indication information related to the time information of CSI reporting failure, and resets CSI auxiliary information and / or retransmits CSI feedback information based on the first indication information. Thus, the terminal device can reset CSI auxiliary information and / or retransmit CSI feedback information according to the time of CSI reporting failure, which can synchronize the CSI auxiliary information on the terminal device side and the network device side, thereby ensuring the performance of CSI compressed feedback.

[0152] Furthermore, in some other embodiments of this application, when a DCI 0_1 / 0_2 request for CSI reporting is made during non-uplink data service scheduling, the terminal device receives a modulation and coding scheme (MCS) table with a lower first transmission error rate configured by the network device, or a rank indicator (RI), or a modulation and coding scheme (MCS), or a precoding matrix indicator (TPMI). This avoids CSI reporting failures.

[0153] Second aspect of the embodiments

[0154] This application provides a Channel State Information (CSI) feedback method, applied to a network device, which corresponds to the method in the first aspect embodiment. The contents that are the same as those in the first aspect embodiment will not be repeated.

[0155] Figure 8 is a schematic diagram of a channel state information feedback method according to an embodiment of the second aspect of this application. As shown in Figure 8, from the network device (NW) side, the method includes:

[0156] Operation 801: The network device sends first indication information to the terminal device. This first indication information is related to the time information of CSI reporting failure, and the first indication information configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information; and

[0157] Operation 802: Receive information sent by the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information according to the first instruction information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0158] In some embodiments, the first indication information is carried in at least one of downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, a first downlink control information format (DCI format), radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling. The terminal device determines the time of CSI reporting failure based on the first indication information and resets the CSI auxiliary information based on the time.

[0159] In some embodiments, the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling is non-data service scheduling DCI (DCI 1_1 / 1_2 without DL assignment, DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH).

[0160] The fields or domains in the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling used for data service scheduling of the physical downlink shared channel or physical uplink shared channel (PDSCH / PUSCH) are multiplexed to carry the first indication information.

[0161] In some embodiments, the terminal device resets the CSI auxiliary information to the most recently available historical CSI auxiliary information from the time the CSI reporting failure occurred; or

[0162] The terminal device resets the CSI auxiliary information to the default value.

[0163] In some embodiments, the time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling for instructing the terminal device to reset the CSI auxiliary information is sent.

[0164] In some embodiments,

[0165] The network device configures a time or time slot offset value (K_offset) for the terminal device; or

[0166] The network device configures two or more time slot offset values ​​(K_offset) for the terminal device, and the network device sends an activation instruction to the terminal device to activate one time slot offset value (K_offset).

[0167] In some embodiments, the bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

[0168] In some embodiments, the terminal device resets the CSI auxiliary information at a predetermined time or time slot (delta_K) after receiving a signaling instruction to reset the CSI auxiliary information.

[0169] In some embodiments, the first indication information is carried in at least one of downlink control information (DCI) 0_1 / 0_2 signaling, radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling.

[0170] The terminal device determines the time of CSI reporting failure based on the first indication information, and retransmits the CSI feedback information according to the time.

[0171] In some embodiments, the downlink control information (DCI) 0_1 / 0_2 signaling is non-uplink data service scheduling DCI (DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH).

[0172] The fields or domains in the downlink control information (DCI) 0_1 / 0_2 signaling used for data service scheduling in the Physical Uplink Shared Channel (PUSCH) are multiplexed to carry the first indication information.

[0173] In some embodiments, the terminal device resends the CSI feedback information reported at the time of the CSI reporting failure to the network device.

[0174] In some embodiments, the time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling for instructing the terminal device to retransmit the CSI feedback information is sent.

[0175] In some embodiments, the network device configures a time or time slot offset value (K_offset) for the terminal device; or

[0176] The network device configures two or more time slot offset values ​​(K_offset) for the terminal device, and the network device sends an activation instruction to the terminal device to activate one time slot offset value (K_offset).

[0177] In some embodiments, the network device sends one or more first CSI reporting configurations to the terminal device, wherein the first CSI reporting configurations configure the time or time slot offset value (K_offset) for the terminal device.

[0178] The network device sends DCI 0_1 / 0_2 signaling to the terminal device as signaling to instruct the terminal device to retransmit CSI feedback information. The Channel State Information Request (CSI request) field or field in the signaling triggers the first CSI reporting configuration to retransmit the CSI feedback information.

[0179] In some embodiments, at least one of the first CSI reporting configurations is associated with a corresponding second CSI reporting configuration.

[0180] The terminal device retransmits the CSI feedback information corresponding to the first CSI reporting configuration according to the second CSI reporting configuration.

[0181] In some embodiments, the first CSI reporting configuration is not associated with Channel State Information Reference Signal (CSI-RS) resource configuration.

[0182] In some embodiments, the bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

[0183] In some embodiments, the terminal device retransmits the CSI feedback information at a predetermined time or time slot (delta_K) after receiving a signaling instruction instructing the terminal device to retransmit the CSI feedback information.

[0184] Furthermore, in some other embodiments of this application, when a DCI 0_1 / 0_2 request for CSI reporting is made for a non-uplink data service scheduling, the network device can configure a Modulation and Coding Scheme (MCS) table, or a Rank Indicator (RI), or a Modulation and Coding Scheme (MCS), or a Precoding Matrix Indicator (TPMI) with a lower first-transmission error rate for the terminal device. This can prevent CSI reporting failures.

[0185] Third aspect of the embodiments

[0186] This application provides a Channel State Information (CSI) feedback device. This device may be, for example, a terminal device, or one or more components or parts configured within the terminal device. It corresponds to the method applied to the terminal device side in the first aspect embodiment, and the content identical to that in the first aspect embodiment will not be repeated.

[0187] Figure 9 is a schematic diagram of a channel state information (CSI) feedback device according to an embodiment of this application. As shown in Figure 9, the channel state information (CSI) feedback device 900 includes:

[0188] A first receiver 901 receives first indication information sent by a network device. This first indication information is related to the time information of a CSI reporting failure. Furthermore, the first indication information configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information.

[0189] The first transmitter 902 resets CSI auxiliary information and / or retransmits CSI feedback information based on the first indication information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0190] In some embodiments, the first indication information is carried in at least one of downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, a first downlink control information format (DCI format), radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling.

[0191] The device determines the time of CSI reporting failure based on the first indication information, and resets the CSI auxiliary information based on the time.

[0192] In some embodiments, the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling is non-data service scheduling DCI (DCI 1_1 / 1_2 without DL assignment, DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH).

[0193] The fields or domains in the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling used for data service scheduling of the physical downlink shared channel or physical uplink shared channel (PDSCH / PUSCH) are multiplexed to carry the first indication information.

[0194] In some embodiments, the device resets the CSI auxiliary information to the most recently available historical CSI auxiliary information from the time the CSI reporting failure occurred; or

[0195] The device resets the CSI auxiliary information to its default value.

[0196] In some embodiments, the time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling for instructing the terminal device to reset the CSI auxiliary information is received.

[0197] In some embodiments, the device is configured by the network device with a time or time slot offset value (K_offset); or

[0198] The device is configured with two or more time slot offset values ​​(K_offset) by the network device, and the terminal device receives an activation instruction sent by the network device to activate one time slot offset value (K_offset).

[0199] In some embodiments, the bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

[0200] In some embodiments, the device resets the CSI auxiliary information at a predetermined time or time slot (delta_K) after receiving a signaling instruction to the terminal device to reset the CSI auxiliary information.

[0201] In some embodiments, the first indication information is carried in at least one of downlink control information (DCI) 0_1 / 0_2 signaling, radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling.

[0202] The device determines the time of CSI reporting failure based on the first indication information, and retransmits the CSI feedback information according to the time.

[0203] In some embodiments, the downlink control information (DCI) 0_1 / 0_2 signaling is non-uplink data service scheduling DCI (DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH).

[0204] The fields or domains in the downlink control information (DCI) 0_1 / 0_2 signaling used for data service scheduling in the Physical Uplink Shared Channel (PUSCH) are multiplexed to carry the first indication information.

[0205] In some embodiments, the device resends the CSI feedback information reported at the time of the CSI reporting failure to the network device.

[0206] In some embodiments, the time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling for instructing the device to retransmit the CSI feedback information is received.

[0207] In some embodiments, the device is configured by the network device with a time or time slot offset value (K_offset); or

[0208] The device is configured with two or more time slot offset values ​​(K_offset) by the network device, and the device receives an activation instruction sent by the network device to activate one time slot offset value (K_offset).

[0209] In some embodiments, the apparatus receives one or more first CSI reporting configurations sent by the network device, wherein the first CSI reporting configurations configure the time or time slot offset value (K_offset) for the apparatus.

[0210] The device receives DCI 0_1 / 0_2 signaling as signaling to instruct the device to retransmit CSI feedback information, wherein the Channel State Information Request (CSI request) field or field triggers the first CSI reporting configuration to retransmit CSI feedback information.

[0211] In some embodiments, at least one of the first CSI reporting configurations is associated with a corresponding second CSI reporting configuration.

[0212] The device retransmits the CSI feedback information corresponding to the first CSI reporting configuration according to the second CSI reporting configuration.

[0213] In some embodiments, the first CSI reporting configuration is not associated with Channel State Information Reference Signal (CSI-RS) resource configuration.

[0214] In some embodiments, the bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

[0215] In some embodiments, the device retransmits the CSI feedback information at a predetermined time or time slot (delta_K) after receiving a signaling instruction to the terminal device to retransmit the CSI feedback information.

[0216] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0217] It is worth noting that the above description only covers the components or modules relevant to this application, but this application is not limited thereto. The device 900 may also include other components or modules; for details regarding these components or modules, please refer to related technologies.

[0218] Furthermore, for simplicity, Figure 9 only illustrates the connection relationships or signal flow between the various components or modules, but those skilled in the art should understand that various related technologies such as bus connections can be used. The aforementioned components or modules can be implemented using hardware facilities such as processors, memory, transmitters, and receivers; this application does not limit this implementation.

[0219] Fourth aspect of the embodiment

[0220] This application provides a Channel State Information (CSI) feedback device. This device may be, for example, a network device, or one or more components or parts configured within a network device. It corresponds to the method applied to the network device side in the second aspect of the embodiment, and the content identical to that in the second aspect of the embodiment will not be repeated.

[0221] Figure 10 is a schematic diagram of a Channel State Information (CSI) feedback device according to an embodiment of this application. As shown in Figure 10, the Channel State Information (CSI) feedback device 1000 includes:

[0222] The second transmitter 1001 sends a first indication message to the terminal device. This first indication message is related to the time information of a CSI reporting failure, and configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information.

[0223] The second receiver 1002 receives information sent by the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information according to the first instruction information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0224] In some embodiments, the first indication information is carried in at least one of downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, a first downlink control information format (DCI format), radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling. The terminal device determines the time of CSI reporting failure based on the first indication information and resets the CSI auxiliary information based on the time.

[0225] In some embodiments, the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling is a non-data service scheduling DCI (DCI 1_1 / 1_2 without DL assignment, DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH), and the fields or fields in the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling used for data service scheduling on the physical downlink shared channel or physical uplink shared channel (PDSCH / PUSCH) are multiplexed to carry the first indication information.

[0226] In some embodiments, the terminal device resets the CSI auxiliary information to the most recently available historical CSI auxiliary information from the time the CSI reporting failure occurred; or

[0227] The terminal device resets the CSI auxiliary information to the default value.

[0228] In some embodiments, the time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling for instructing the terminal device to reset the CSI auxiliary information is sent.

[0229] In some embodiments, the device configures a time or time slot offset value (K_offset) for the terminal device; or

[0230] The device configures two or more time slot offset values ​​(K_offset) for the terminal device, and the device sends an activation instruction to the terminal device to activate one time slot offset value (K_offset).

[0231] In some embodiments, the bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

[0232] In some embodiments, the terminal device resets the CSI auxiliary information at a predetermined time or time slot (delta_K) after receiving a signaling instruction to reset the CSI auxiliary information.

[0233] In some embodiments, the first indication information is carried in at least one of downlink control information (DCI) 0_1 / 0_2 signaling, radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling. The terminal device determines the time of CSI reporting failure based on the first indication information and retransmits the CSI feedback information according to the time.

[0234] In some embodiments, the downlink control information (DCI) 0_1 / 0_2 signaling is a non-uplink data service scheduling DCI (DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH), and the fields or fields in the downlink control information (DCI) 0_1 / 0_2 signaling used for physical uplink shared channel (PUSCH) data service scheduling are multiplexed to carry the first indication information.

[0235] In some embodiments, the terminal device resends the CSI feedback information reported at the time of the CSI reporting failure to the device.

[0236] In some embodiments, the time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling for instructing the terminal device to retransmit the CSI feedback information is sent.

[0237] In some embodiments, the device configures a time or time slot offset value (K_offset) for the terminal device; or

[0238] The device configures two or more time slot offset values ​​(K_offset) for the terminal device, and the device sends an activation instruction to the terminal device to activate one time slot offset value (K_offset).

[0239] In some embodiments, the apparatus sends one or more first CSI reporting configurations to the terminal device, wherein the first CSI reporting configuration configures the time or slot offset value (K_offset) for the terminal device, and the apparatus sends DCI 0_1 / 0_2 signaling to the terminal device as signaling to instruct the terminal device to retransmit CSI feedback information, wherein the channel state information request (CSI request) field or field triggers the first CSI reporting configuration to retransmit the CSI feedback information.

[0240] In some embodiments, at least one of the first CSI reporting configurations is associated with a corresponding second CSI reporting configuration, and the terminal device retransmits the CSI feedback information corresponding to the first CSI reporting configuration according to the second CSI reporting configuration.

[0241] In some embodiments, the first CSI reporting configuration is not associated with Channel State Information Reference Signal (CSI-RS) resource configuration.

[0242] In some embodiments, the bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

[0243] In some embodiments, the terminal device retransmits the CSI feedback information at a predetermined time or time slot (delta_K) after receiving a signaling instruction instructing the terminal device to retransmit the CSI feedback information.

[0244] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0245] It is worth noting that the above description only covers the components or modules relevant to this application, but this application is not limited thereto. The device 1000 may also include other components or modules; for details regarding these components or modules, please refer to related technologies.

[0246] Furthermore, for simplicity, Figure 10 only illustrates the connection relationships or signal flow between the various components or modules, but those skilled in the art should understand that various related technologies such as bus connections can be used. The aforementioned components or modules can be implemented using hardware facilities such as processors, memory, transmitters, and receivers; this application does not limit this implementation.

[0247] Fifth aspect of the embodiment

[0248] This application provides a communication system, including a terminal device and a network device.

[0249] For example, the structure of the communication system can be seen with reference to FIG1. ​​As shown in FIG1, the communication system 100 includes network device 101 and terminal devices 102 and 103. At least one of the terminal devices 102, 103 and network device 101 may have the configuration of the electronic device shown in FIG11.

[0250] Figure 11 is a schematic block diagram of the electronic device. As shown in Figure 11, the electronic device 1100 may include a processor 1110 and a memory 1120; the memory 1120 is coupled to the processor 1110. The memory 1120 can store various data; in addition, it also stores an information processing program 1130, and executes the program 1130 under the control of the processor 1110 to receive or send various information.

[0251] In one embodiment, processor 1110 may be configured to perform the methods in the first aspect embodiment and / or the methods in the second aspect embodiment.

[0252] Furthermore, as shown in Figure 11, the electronic device 1100 may also include a transceiver 1140 and an antenna 1150, etc.; the functions of the above components are similar to those in the prior art, and will not be described in detail here. It is worth noting that the electronic device 1100 does not necessarily include all the components shown in Figure 11; in addition, the electronic device 1100 may also include components not shown in Figure 11, which can be referred to in the prior art.

[0253] This application also provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to perform the channel state information feedback method described in the first aspect embodiment.

[0254] This application also provides a storage medium storing a computer program, wherein the computer program causes a terminal device to execute the channel state information feedback method described in the first aspect embodiment.

[0255] This application also provides a computer program, wherein when the program is executed in a network device, the program causes the network device to perform the channel state information feedback method described in the second aspect of the embodiment.

[0256] This application also provides a storage medium storing a computer program, wherein the computer program causes a network device to perform the channel state information feedback method described in the second aspect of the embodiment.

[0257] The apparatus and methods described above in this application can be implemented in hardware or in combination with software. This application relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various methods or steps described above. This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

[0258] The methods / apparatus described in conjunction with the embodiments of this application can be directly embodied in hardware, software modules executed by a processor, or a combination of both. For example, one or more and / or combinations of one or more functional block diagrams shown in the figures can correspond to various software modules in a computer program flow, or to various hardware modules. These software modules can correspond to the various steps shown in the figures, respectively. These hardware modules can be implemented, for example, using a field-programmable gate array (FPGA) to embed these software modules.

[0259] The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, enabling the processor to read information from and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and storage medium can reside in an ASIC. The software module can be stored in the memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a high-capacity MEGA-SIM card or a high-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the high-capacity flash memory device.

[0260] One or more and / or one or more combinations of functional blocks described in the figures can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described in this application. One or more and / or one or more combinations of functional blocks described in FIG9 or FIG10 can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0261] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

[0262] According to the various embodiments disclosed in this application, the following notes are also disclosed:

[0263] 1. A channel state information feedback method, applied to a terminal device, wherein the method includes:

[0264] The terminal device receives a first indication message sent by a network device. This first indication message is related to the time information of a CSI reporting failure. Furthermore, the first indication message configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information.

[0265] The CSI auxiliary information is reset and / or the CSI feedback information is retransmitted according to the first indication information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0266] 2. A channel state information feedback method, applied to a network device, wherein the method includes:

[0267] Send a first indication message to the terminal device, the first indication message being related to the time information of CSI reporting failure, and configuring the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information; and

[0268] The terminal device receives information sent by resetting CSI auxiliary information and / or retransmitting CSI feedback information according to the first indication information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

[0269] 3. A channel state information feedback method, applied to a terminal device, wherein the method includes:

[0270] When a non-uplink data service scheduling DCI 0_1 / 0_2 requests CSI reporting, the terminal device receives a modulation and coding scheme (MCS) table with a lower first transmission error rate configured by the network device, or a rank indicator (RI), or a modulation and coding scheme (MCS), or a precoding matrix indicator (TPMI).

[0271] 4. A channel state information feedback method, applied to a network device, wherein the method includes:

[0272] When a non-uplink data service scheduling DCI 0_1 / 0_2 requests CSI reporting, the network device configures a modulation and coding scheme (MCS) table, or a rank indicator (RI), or a modulation and coding scheme (MCS), or a precoding matrix indicator (TPMI) for the terminal device to have a lower first transmission error rate.

[0273] 5. A terminal device comprising a memory and a processor, the memory storing a computer program and the processor being configured to execute the computer program to implement the method as described in Appendix 1 or 3.

[0274] 6. A network device comprising a memory and a processor, the memory storing a computer program and the processor being configured to execute the computer program to implement the method as described in Appendix 2 or 4.

[0275] 7. A computer program product comprising at least a computer program that, when executed by a processor, causes a terminal device to perform the method as described in Appendix 1 or 3.

[0276] 8. A computer program product comprising at least a computer program that, when executed by a processor, causes a network device to perform the method as described in Appendix 2 or 4.

Claims

1. A channel state information (CSI) feedback device, applied to a terminal device, the device comprising: A first receiver receives a first indication message sent by a network device. The first indication message is related to the time information of CSI reporting failure, and the first indication message configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information. as well as A first transmitter resets CSI auxiliary information and / or retransmits CSI feedback information based on the first indication information, the CSI feedback information being generated based on an artificial intelligence / machine learning (AI / ML) model or function.

2. The apparatus of claim 1, wherein, The first indication information is carried in at least one of Downlink Control Information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling, First Downlink Control Information Format (DCI format), Radio Resource Control (RRC) signaling, and Media Access Control Element (MAC-CE) signaling. The device determines the time of CSI reporting failure based on the first indication information, and resets the CSI auxiliary information based on the time.

3. The apparatus of claim 2, wherein, The downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling is a non-data service scheduling DCI (DCI 1_1 / 1_2 without DL assignment, DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH). The fields or domains in the downlink control information (DCI) 1_1 / 1_2 / 0_1 / 0_2 signaling used for data service scheduling of the physical downlink shared channel or physical uplink shared channel (PDSCH / PUSCH) are multiplexed to carry the first indication information.

4. The apparatus of claim 2, wherein, The device resets the CSI auxiliary information to the most recently available historical CSI auxiliary information from the time the CSI reporting failure occurred; or The device resets the CSI auxiliary information to its default value.

5. The apparatus of claim 2, wherein, The time of CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset (K_offset) from the time or time slot when the signaling used to instruct the terminal device to reset the CSI auxiliary information is received.

6. The apparatus of claim 5, wherein, The device is configured by the network device with a time or time slot offset value (K_offset); or The device is configured with two or more time slot offset values ​​(K_offset) by the network device, and the terminal device receives an activation instruction sent by the network device to activate one time slot offset value (K_offset).

7. The apparatus of claim 5, wherein, The bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

8. The apparatus of claim 2, wherein, The device resets the CSI auxiliary information at a predetermined time or time slot (delta_K) after receiving a signaling instruction to the terminal device to reset the CSI auxiliary information.

9. The apparatus of claim 1, wherein, The first indication information is carried in at least one of downlink control information (DCI) 0_1 / 0_2 signaling, radio resource control (RRC) signaling, and media access control element (MAC-CE) signaling. The device determines the time of CSI reporting failure based on the first indication information, and retransmits the CSI feedback information according to the time.

10. The apparatus of claim 9, wherein, The downlink control information (DCI) 0_1 / 0_2 signaling is a non-uplink data service scheduling DCI (DCI 0_1 / 0_2 without UL-SCH transmission on PUSCH). The fields or domains in the downlink control information (DCI) 0_1 / 0_2 signaling used for data service scheduling in the Physical Uplink Shared Channel (PUSCH) are multiplexed to carry the first indication information.

11. The apparatus of claim 9, wherein, The device resends the CSI feedback information reported at the time of the CSI reporting failure to the network device.

12. The apparatus of claim 9, wherein, The time of the CSI reporting failure is equal to the time or time slot obtained by subtracting the time or time slot offset value (K_offset) from the time or time slot when the signaling used to instruct the device to retransmit the CSI feedback information is received.

13. The apparatus of claim 12, wherein, The device is configured by the network device with a time or time slot offset value (K_offset); or The device is configured with two or more time slot offset values ​​(K_offset) by the network device, and the device receives an activation instruction sent by the network device to activate one time slot offset value (K_offset).

14. The apparatus of claim 12, wherein, The device receives one or more first CSI reporting configurations sent by the network device, wherein the first CSI reporting configuration configures the time or time slot offset value (K_offset) for the device. The device receives DCI 0_1 / 0_2 signaling as signaling to instruct the device to retransmit CSI feedback information, wherein the Channel State Information Request (CSIrequest) field or field triggers the first CSI reporting configuration to retransmit CSI feedback information.

15. The apparatus of claim 14, wherein, At least one of the first CSI reporting configurations is associated with a corresponding second CSI reporting configuration. The device retransmits the CSI feedback information corresponding to the first CSI reporting configuration according to the second CSI reporting configuration.

16. The apparatus of claim 14, wherein, The first CSI report configuration is not associated with Channel State Information Reference Signal (CSI-RS) resource configuration.

17. The apparatus of claim 12, wherein, The bit width of the time or time slot offset value (K_offset) is set based on the reporting capability of the terminal device.

18. The apparatus of claim 12, wherein, The device retransmits the CSI feedback information at a predetermined time or time slot (delta_K) after receiving the signaling or time slot instructing the terminal device to retransmit the CSI feedback information.

19. A channel state information (CSI) feedback device, applied to a network device, the device comprising: The second transmitter sends a first indication message to the terminal device. The first indication message is related to the time information of CSI reporting failure. The first indication message configures the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information. as well as The second receiver receives information sent by the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information according to the first instruction information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

20. A communication system, comprising terminal equipment and network equipment, The network device is configured to send first indication information to the terminal device, the first indication information being related to the time information of CSI reporting failure, and the first indication information configuring the terminal device to reset CSI auxiliary information and / or retransmit CSI feedback information; and The terminal device is configured to reset CSI auxiliary information and / or retransmit CSI feedback information according to the first indication information, wherein the CSI feedback information is generated based on an artificial intelligence / machine learning (AI / ML) model or function.

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