CSI report feedback method, terminal, and network-side device

Abstract

The present application belongs to the technical field of wireless communications. Disclosed are a CSI report feedback method, a terminal, and a network-side device. The channel state information report feedback method in the embodiments of the present application comprises: on the basis of DCI sent by a network-side device, a terminal determining that the terminal acquires a CSI report on the basis of a DMRS; the terminal acquiring a CSI report on the basis of a measurement result obtained by measuring a DMRS associated with the CSI report; and the terminal feeding back the CSI report on an uplink channel resource associated with the CSI report.

Description

CSI report feedback methods, terminals, and network-side equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411202334.7, filed on August 29, 2024, entitled "Feedback Method, Terminal and Network Side Device for CSI Report", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of wireless communication technology, specifically relating to a CSI report feedback method, terminal, and network-side equipment. Background Technology

[0004] In related technologies, Channel State Information (CSI) measurements are all based on CSI Reference Signals (CSI-RS). Network-side equipment may configure multiple CSI-RS for a terminal, and the terminal obtains CSI information by measuring each CSI-RS and feeds it back to the network-side equipment. However, as the number of CSI-RS ports further increases, frequent CSI measurements may lead to unacceptable overhead for the CSI-RS. Summary of the Invention

[0005] This application provides a CSI report feedback method, terminal, and network-side device, which can solve the problem that frequent CSI measurements may lead to unacceptable overhead for CSI-RS.

[0006] In a first aspect, a method for feeding back Channel State Information (CSI) reports is provided, comprising: a terminal determining, based on Downlink Control Information (DCI) sent by a network-side device, that the terminal obtains a CSI report based on a Demodulation Reference Signal (DMRS); the terminal obtaining a CSI report based on a measurement result obtained by measuring the DMRS associated with the CSI report; and the terminal feeding back the CSI report on the uplink channel resources associated with the CSI report.

[0007] Secondly, a method for obtaining a CSI report is provided, comprising: a network-side device sending a DCI to a terminal, wherein the DCI instructs the terminal to obtain a CSI report based on DMRS; and the network-side device receiving the CSI report fed back by the terminal based on DMRS on the uplink channel resources associated with the CSI report.

[0008] Thirdly, a feedback device for a channel state information report is provided, comprising: a receiving module for receiving a DCI sent by a network-side device; a processing module for determining, based on the DCI, that the terminal obtains a CSI report based on DMRS, and obtaining a CSI report based on measurement results obtained by measuring the DMRS associated with the CSI report; and a sending module for feeding back the CSI report on the uplink channel resources associated with the CSI report.

[0009] Fourthly, a CSI report acquisition apparatus is provided, comprising: a sending module for sending a DCI to a terminal, wherein the DCI instructs the terminal to acquire a CSI report based on DMRS; and a receiving module for receiving a CSI report fed back by the terminal based on DMRS on the uplink channel resources associated with the CSI report.

[0010] Fifthly, a feedback device for a CSI report is provided, the device being configured to perform the steps of the method described in the first aspect.

[0011] In a sixth aspect, an apparatus for acquiring CSI reports is provided, the apparatus being configured to perform the steps of the method described in the second aspect.

[0012] In a seventh aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0013] Eighthly, a terminal is provided, including a processor and a communication interface, wherein the processor is configured to perform the steps of the method described in the first aspect, and the communication interface is configured to be coupled to the processor.

[0014] A ninth aspect provides a network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0015] In a tenth aspect, a network-side device is provided, including a processor and a communication interface, wherein the processor is configured to perform the steps of the method described in the second aspect, and the communication interface is configured to be coupled to the processor.

[0016] Eleventhly, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0017] In a twelfth aspect, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal is configured to perform the steps of the method described in the first aspect, and the network-side device is configured to perform the steps of the method described in the second aspect.

[0018] In a thirteenth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0019] In a fourteenth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the method as described in the first aspect, or to implement the steps of the method as described in the second aspect.

[0020] In this embodiment, the terminal determines, based on the Downlink Control Information (DCI) sent by the network-side device, that it will obtain a CSI report using the Demodulation Reference Signal (DMRS). The terminal then obtains the CSI report based on the measurement results obtained by measuring the DMRS associated with the CSI report. Finally, the terminal feeds back the CSI report on the uplink channel resources associated with the CSI report. This allows the terminal to obtain at least the CSI of a local channel based on the DMRS, thus avoiding the problem of excessive CSI-RS overhead caused by the terminal always obtaining CSI based on the CSI-RS. Attached Figure Description

[0021] Figure 1 shows a block diagram of a wireless communication system that can be applied to an embodiment of this application;

[0022] Figure 2 shows a flowchart of a CSI report feedback method provided in an embodiment of this application;

[0023] Figure 3 shows another flowchart of the CSI report feedback method provided in the embodiments of this application;

[0024] Figure 4 shows another flowchart of the CSI report feedback method provided in the embodiments of this application;

[0025] Figure 5 shows a flowchart of a method for obtaining CSI reports provided in an embodiment of this application;

[0026] Figure 6 shows a schematic diagram of a CSI report feedback device provided in an embodiment of this application;

[0027] Figure 7 shows a schematic diagram of a CSI report acquisition device provided in an embodiment of this application;

[0028] Figure 8 shows a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0029] Figure 9 shows a schematic diagram of the hardware structure of a terminal provided in an embodiment of this application;

[0030] Figure 10 shows a schematic diagram of the hardware structure of a network-side device provided in an embodiment of this application. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0032] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0033] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc., in the instruction sent. An indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0034] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used in the systems and radio technologies mentioned above, as well as in other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th Generation (6G) communication systems.

[0035] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Network-side equipment 12 may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (APs), or Wireless Fidelity (WiFi) nodes, etc.The term "base station" can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), or any other suitable term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to any specific technical terminology. It should be noted that this application embodiment only uses a base station in an NR system as an example for description and does not limit the specific type of base station.

[0036] In related technologies, DMRS is used for channel estimation. The relevant DMRS configuration information is determined through downlink DCI. In the current New Radio (NR) system, the number of DMRS ports is equal to the number of streams in the Physical downlink shared channel (PDSCH).

[0037] For DMRS in data channels, it can be categorized into two types: DMRS Configuration Type 1 and DMRS Configuration Type 2. Both types support single-symbol and double-symbol structures. DMRS Configuration Type 1 supports a maximum of 4 ports for a single-symbol structure and a maximum of 8 ports for a double-symbol structure. DMRS Configuration Type 2 supports a maximum of 6 ports for a single-symbol structure and a maximum of 12 ports for a double-symbol structure. Furthermore, DMRS Configuration Type 1 supports 2 Code Division Multiplexing (CDM) groups, while DMRS Configuration Type 2 supports 3 CDM groups.

[0038] In NR version 18 (Rel-18), the number of ports in each CDM group is doubled by using a 4-segment length for the Frequency Division-Orthogonal Cover Code (FD-OCC) sequence. For DMRS type 1, a single-symbol structure will support a maximum of 8 ports, and a double-symbol structure will support a maximum of 16 ports; for DMRS type 2, a single-symbol structure will support a maximum of 12 ports, and a double-symbol structure will support a maximum of 24 ports. Furthermore, in Rel-18, the number of PUSCH data streams per terminal will be expanded from a maximum of 4 streams to a maximum of 8 streams. This means that the corresponding DMRS for each terminal's transmitted PUSCH will require a maximum of 8 ports for multiplexing. However, whether to use existing DMRS ports or the enhanced DMRS ports of Rel-18 depends on the terminal's capabilities.

[0039] In related technologies, network-side devices can configure multiple non-periodic CSI report configurations (CSI-ReportConfig) via Radio Resource Control (RRC) signaling. Each CSI report configuration is associated with: CSI-RS configuration (CSI-ResourceConfig), CSI report content, and frequency domain configuration of the CSI report, etc.

[0040] Network-side devices activate at least one CSI report configuration via the CSI request field in the uplink DCI. Each CSI report configuration can be associated with an aperiodic CSI-RS, a semi-persistent CSI-RS, or a periodic CSI-RS. When each CSI report configuration is associated with an aperiodic CSI-RS, the transmission time associated with that CSI-RS is determined based on the aperiodic triggering offset in the RRC signaling of the set of CSI-RSs associated with the aperiodic CSI-RS.

[0041] The uplink channel resources carrying the aperiodic CSI are Physical Uplink Shared Channel (PUSCH) resources. The configuration information of the PUSCH resources (such as start and length values ​​(SLIV), start and length indicator, PUSCH mapping type, etc.) are determined based on the RRC parameter report slot offset list in the uplink DCI or CSI report configuration.

[0042] Current CSI measurements are all based on CSI-RS. However, as the number of CSI-RS ports increases, frequent CSI measurements may make the overhead of CSI-RS unacceptable. Therefore, in this embodiment, local channel CSI is obtained or CSI-RS overhead is reduced through DMRS-based CSI measurements. For example, the period of CSI-RS-based CSI measurements can be increased, and within one CSI-RS-based CSI measurement period, local channel CSI is obtained or CSI-RS overhead is reduced through DMRS-based CSI measurements.

[0043] The feedback scheme for CSI reports provided in this application will be described in detail below with reference to the accompanying drawings, through some embodiments and application scenarios.

[0044] Figure 2 shows a flowchart of a channel state information reporting feedback method according to an embodiment of this application. This method 200 can be executed by a terminal. In other words, the method can be executed by software or hardware installed on the terminal. As shown in Figure 2, the method may include the following steps.

[0045] S210, the terminal determines, based on the DCI sent by the network-side device, that the terminal obtained the CSI report based on DMRS.

[0046] In this embodiment, the network-side device can use DCI to instruct the terminal to obtain a CSI report based on DMRS, thereby enabling the terminal to perform channel estimation and obtain CSI information based on DMRS. DCI can trigger a DMRS-based CSI measurement and CSI reporting. The frequency domain configuration and report content associated with the CSI report can be agreed upon by the protocol, or they can be instructed by DCI.

[0047] In related technologies, CSI report configuration is indicated to the terminal via uplink DCI, and DMRS configuration is indicated to the terminal via downlink DCI. Therefore, to support DMRS-based CSI measurement, a direct approach is for the network-side device to send one downlink DCI to indicate DMRS configuration information and one uplink DCI to indicate CSI report configuration information. The terminal performs CSI measurement after receiving both DCIs. This approach wastes DCIs, and if any one of the DCIs fails to be received correctly, the terminal cannot perform DMRS-based CSI measurement. Therefore, in this embodiment, one DCI triggers one DMRS-based CSI measurement and CSI reporting, thus eliminating the need for additional DCIs to determine the DMRS configuration associated with the CSI measurement and avoiding unnecessary signaling overhead.

[0048] In some embodiments, the DCI may include a first field for indicating that a CSI report is obtained based on DMRS, and the terminal determines that the terminal obtains a CSI report based on DMRS based on the first field.

[0049] In some implementations, the DCI may indicate a DMRS, and the first field may be used to indicate whether a CSI report is obtained based on the DMRS indicated by the DCI.

[0050] In one implementation, the length of the first field can be 1 bit. The first field is used to indicate whether the terminal obtains a CSI report based on the DMRS indicated by the DCI. For example, when the indication value of the first field is 1, the DCI is associated with a DMRS-based CSI report; when the indication value of the first field is 0, the DCI is not associated with a DMRS-based CSI report, or the DCI does not trigger a DMRS-based CSI report. Optionally, the frequency domain configuration and report content associated with the DMRS-based CSI report are agreed upon by the protocol.

[0051] In another implementation, the first field may be N bits, where N is greater than 1. N represents at least one of the following indicated by the DCI: the number of DMRS configurations, the number of DMRS occasions, the number of DMRS, or the number of PDSCH configurations or PDSCH occasions indicated by the DCI, or the number of repetitions of the PDSCH indicated by the DCI, or the number of DMRS-based CSI report configurations pre-configured by the network. For example, if the downlink DCI indicates N PDSCH receptions, then the first field is N bits, with each bit corresponding to one PDSCH, used to indicate whether the terminal obtains a CSI report based on the DMRS associated with its associated PDSCH. For example, if the downlink DCI indicates N DMRS, then the first field is N bits, with each bit corresponding to one DMRS, used to indicate whether the terminal obtains a CSI report based on its associated DMRS. For example, if the downlink DCI indicates N PDSCH repetitions, then the first field is N bits, with each bit corresponding to one repetition transmission, used to indicate whether the terminal obtains a CSI report based on its associated DMRS.

[0052] In another implementation, the length of the first field may be greater than or equal to 1 bit, and the first bit is used to indicate whether the terminal obtains a CSI report based on the DMRS indicated by the DCI. Optionally, the first field is also used for at least one of the following functions:

[0053] 1) Instructs the CSI to report associated configuration information;

[0054] The first field indicates the configuration information associated with the CSI report. This can be understood as follows: the first field can also be used to indicate parameters that need to be determined during the CSI report acquisition process. For example, reference signal configuration, CSI report frequency domain configuration, CSI report content, CSI report reporting configuration, etc. Optionally, the CSI report can be a CSI report acquired based on CSI-RS. When it is a CSI report acquired based on CSI-RS, it indicates that the terminal does not need to acquire the CSI report based on the DMRS indicated by the DCI. Optionally, the CSI report can also be a CSI report acquired based on DMRS. When it is a CSI report acquired based on DMRS, it indicates that the terminal needs to acquire the CSI report based on the DMRS indicated by the DCI.

[0055] For example, a first field associated with N bits has a total of 2^N codepoints. One codepoint indicates that the current DCI is not associated with a CSI report. The remaining 2^N-1 codepoints are associated with the configuration information of at most 2^N-1 DMRS-based CSI reports. The configuration information of each CSI report is associated with an RRC signaling, and the associated RRC signaling contains the configuration information associated with the CSI report.

[0056] For example, a first field associated with N bits has a total of 2^N codepoints. One codepoint indicates that the current DCI is not associated with a CSI report, and at least one of the remaining 2^N-1 codepoints indicates that the terminal obtains a CSI report based on the DMRS indicated by the DCI. When the codepoint indicated by the DCI is one of the at least one codepoints, it means that the terminal obtains a CSI report based on the DMRS indicated by the DCI. Optionally, different codepoints in the at least one codepoint are associated with different DMRS, DMRS configurations, DMRS occasions, or different CSI report configurations.

[0057] The first field indicates the configuration information associated with the CSI report, and can also be understood as follows: the first field indicates the configuration information associated with the CSI report, and the configuration information associated with the CSI report includes or is related to the configuration information of the DMRS associated with the CSI report. Optionally, the configuration information of the DMRS includes at least one of the following: DMRS sequence configuration, DMRS time-domain location configuration, DMRS frequency-domain location configuration, DMRS port configuration, DMRS power-related parameters, and DMRS pattern configuration on an RB.

[0058] For example, the first field is a CSI request field. When the first field is all 0, it means that the DCI is not associated with a CSI report. When the first field is a specific codepoint, it corresponds to a pre-configured CSI report configuration. The CSI report configuration is associated with a DMRS configuration. The terminal determines a CSI report based on the DMRS configuration and the CSI report configuration, and determines an uplink channel resource to carry the CSI report, and further feeds back the CSI report to the network device.

[0059] 2) Indicates the configuration information of the DMRS associated with the PDSCH; the first field indicates the configuration information of the DMRS, which can be understood as: the first field may also indicate at least one of the following: the number of DMRS ports associated with the PDSCH, the port number of the DMRS associated with the PDSCH, the frequency domain configuration of the DMRS associated with the PDSCH, the time domain configuration of the DMRS associated with the PDSCH, and the CDM group configuration of the DMRS associated with the PDSCH.

[0060] For example, a first field associated with N bits is associated with 2^N codepoints, each codepoint determining at least one of the following: a DMRS port indication, the number of CDM groups without data, or the number of front-load symbols. Furthermore, at least some of these codepoints also determine that the terminal is obtaining a CSI report based on the DMRS indicated by the current DCI.

[0061] For example, a first field containing N bits may have at least one bit indicating that the terminal is retrieving a CSI report from the DMRS based on the current DCI indication. The remaining bits are used to determine at least one of the following: a DMRS port indication, the number of CDM groups without data, and the number of front-load symbols.

[0062] 3) Indicates the configuration information of the DMRS used to measure CSI;

[0063] The first field indicates the configuration information of the DMRS used to measure CSI, and can be understood as follows: the first field is also used for at least one of the following:

[0064] Indicates the number of DMRS ports used to measure CSI;

[0065] Indicates the DMRS port number used for CSI measurement;

[0066] Indicates the time-domain configuration of the DMRS used to measure CSI, such as the position of the time-domain symbols;

[0067] Configure the frequency domain configuration of the DMRS used to measure CSI, such as the location of the frequency domain RBG.

[0068] For example, a first field associated with N bits is associated with 2^N codepoints, where one codepoint indicates that the current DCI is not associated with a CSI report, and at least a portion of the remaining codepoints (indicating that the current DCI is associated with a CSI report) can determine the configuration information of the DMRS used to measure CSI. Alternatively, a first field associated with N bits, if the first field is not all zero bits, indicates that the terminal determines to obtain a CSI report based on the DMRS and obtains the configuration information of the DMRS used to measure CSI based on the first field.

[0069] 4) Instruct CSI to report the associated PUCCH resource information.

[0070] For example, a first field associated with N bits is associated with 2^N codepoints, one of which is used to indicate that the DCI is not associated with a CSI report, and at least a portion of the remaining codepoints (indicating that the current DCI is associated with a CSI report) can determine the PUCCH resource used for CSI feedback.

[0071] 5) Instruct CSI to report the associated PUSCH resource information.

[0072] For example, a first field associated with N bits is associated with 2^N codepoints, one of which is used to indicate that the current DCI is not associated with a CSI report, and at least some of the remaining codepoints (indicating that the current DCI is associated with a CSI report) can determine the PUSCH resource used for CSI feedback.

[0073] 6) Indicates the configuration information for the acknowledgment (ACK / NACK) feedback time associated with the PDSCH;

[0074] For example, a first field associated with N bits is associated with 2^N codepoints, where some codepoints are used to indicate that the DCI is not associated with CSI reports and ACK / NACK feedback time configuration information, and some codepoints indicate that the current DCI is associated with CSI reports and ACK / NACK feedback time configuration information.

[0075] For example, a first field associated with N bits is associated with 2^N codepoints, where at least some codepoints are used to indicate ACK / NACK feedback time configuration information. In addition, the protocol stipulates or the network higher layer signaling indicates the correspondence between the ACK / NACK feedback time configuration information and the DCI associated CSI report or the DCI not associated CSI report. The terminal determines whether the DCI is associated with or not associated with the CSI report based on the determined ACK / NACK feedback time configuration information.

[0076] The above implementation method allows a single DCI to be used to indicate both the configuration information of the DMRS and the configuration information of a CSI report associated with the DMRS. This avoids using two separate DCIs to indicate the configuration information of the DMRS and the CSI report, thus saving DCI overhead.

[0077] In some implementations, the DCI may further include a second field, which indicates configuration information associated with the CSI report. For example, the DCI may include a first field and a second field, where the first field indicates a DMRS configuration and the terminal obtains a CSI report based on the DMRS, and the second field indicates a CSI report configuration.

[0078] The above implementation method allows a single DCI to be used to indicate both the configuration information of the DMRS and the configuration information of a CSI report associated with the DMRS. This avoids using two separate DCIs to indicate the configuration information of the DMRS and the CSI report, thus saving DCI overhead.

[0079] S212, the terminal obtains the CSI report based on the measurement results obtained by measuring the DMRS associated with the CSI report.

[0080] In this embodiment of the application, the terminal determines the CSI report based on DMRS based on DCI. Therefore, the terminal can perform channel measurement on the DMRS associated with the CSI report, obtain the measurement results, and obtain the CSI report based on the measurement results.

[0081] In some embodiments, the terminal may also determine the frequency domain configuration associated with the CSI report, and obtain the CSI report in S212 based on the determined frequency domain configuration associated with the CSI report.

[0082] Optionally, the frequency domain configuration associated with the CSI report may include at least one of the following:

[0083] The frequency domain granularity associated with the CSI report;

[0084] The number of frequency domain subbands associated with the CSI report;

[0085] The number of Precoding Resource Block Groups (PRGs) associated with the CSI report;

[0086] The frequency domain subband size associated with the CSI report;

[0087] The frequency domain sub-band location associated with the CSI report;

[0088] The location of the PRG associated with the CSI report.

[0089] A subband can be understood as a continuous bandwidth consisting of a portion of consecutive PRBs or REs. Optionally, for a subband, the terminal acquires a PMI or a CQI. Optionally, for different subbands, the terminal independently acquires CSI information or CSI parameters.

[0090] In some implementations, the terminal can determine the frequency domain configuration associated with the CSI report based on the DMRS configuration information indicated by the DCI. That is, the frequency domain configuration associated with the CSI report is related to the DMRS configuration.

[0091] For example, when the bandwidth associated with the DMRS indicated by the DCI is less than a predetermined value, the frequency domain granularity associated with the CSI report is broadband, that is, all CSI content included in the CSI report is broadband, or the number is 1.

[0092] For example, when the number of ports associated with DMRS indicated by the DCI is greater than a predetermined value, the frequency domain granularity associated with the CSI report is broadband, that is, all CSI content included in the CSI report is broadband, or the number is 1.

[0093] For example, when the number of DMRS ports associated with the PDSCH indicated by the DCI is greater than a predetermined value, the frequency domain granularity associated with the CSI report is broadband, that is, all CSI content included in the CSI report is broadband, or the number is 1.

[0094] For example, when the ports associated with the DMRS indicated by the DCI are non-uniform in the frequency domain, i.e., some resource blocks (RBs) have additional DMRS ports for CSI measurement, while some RBs do not have additional DMRS ports for CSI measurement, then the CSI report indicates the location of the associated frequency domain subband where additional DMRS ports for CSI measurement exist.

[0095] For example, the protocol stipulates the correspondence between the bandwidth of DMRS and the number of frequency domain subbands associated with CSI reports. When the bandwidth associated with DMRS indicated by DCI is the agreed value, the terminal can determine the number of frequency domain subbands associated with CSI reports based on the correspondence.

[0096] For example, the protocol stipulates the correspondence between the bandwidth of DMRS and the size of the frequency domain subband associated with the CSI report. When the bandwidth associated with DMRS indicated by DCI is the agreed value, the terminal can determine the size of the frequency domain subband associated with the CSI report based on the correspondence.

[0097] In other embodiments, the terminal may determine the frequency domain configuration associated with the CSI report based on the configuration information of the PDSCH indicated by the DCI.

[0098] For example, the terminal determines the size of the resource block group (RBG) associated with the PDSCH based on the DCI indication, and based on the size of the RBG, the terminal determines at least one of the following associated with the CSI report: frequency domain granularity, number of frequency domain subbands, and size of the frequency domain subbands.

[0099] For example, the terminal determines the size of the RBG associated with the PDSCH based on the DCI indication, and based on the size of the RBG and an integer of the network signaling indication, the terminal determines at least one of the following associated with the CSI report: frequency domain granularity, number of frequency domain subbands, and size of frequency domain subbands.

[0100] For example, the terminal determines the bandwidth associated with the PDSCH based on the DCI indication, and based on the bandwidth, the terminal determines at least one of the following associated with the CSI report: frequency domain granularity, number of frequency domain subbands, and size of the frequency domain subbands. This can also be understood as: the frequency domain granularity, number of frequency domain subbands, or size of the frequency domain subbands associated with the CSI report are related to the bandwidth associated with the PDSCH.

[0101] In other embodiments, the terminal may also determine the frequency domain configuration associated with the CSI report based on the acknowledgment information (ACK / NACK) feedback time configuration information indicated by the DCI.

[0102] For example, the terminal determines the frequency domain granularity, the number of frequency domain subbands, or the size of the frequency domain subbands associated with the CSI report based on the ACK / NACK feedback time indicated by the DCI. Optionally, when the feedback time is greater than or equal to a first value, the terminal determines that the frequency domain granularity associated with the CSI report is subband-based, or the number of subbands is a first number, or the size of the frequency domain subband is a first size. When the feedback time is less than or equal to a second value, the terminal determines that the frequency domain granularity associated with the CSI report is wideband-based, or the number of subbands is a second number (the second number is less than the first number), or the size of the frequency domain subband is a second size (the second size is greater than the first size).

[0103] For example, based on the ACK / NACK feedback time configuration information indicated by the DCI, the terminal determines at least one of the following associated with the CSI report: a candidate range for frequency domain granularity, a candidate range for the number of frequency domain subbands, and a candidate range for the size of the frequency domain subbands. Optionally, when the feedback time indicated by the ACK / NACK time configuration information is greater than or equal to a first value, the terminal determines that the candidate range for the frequency domain granularity associated with the CSI report is either subband-based or wideband-based, or the candidate range for the number of subbands is the first range, or the candidate range for the size of the frequency domain subbands is the second range. When the feedback time indicated by the ACK / NACK feedback time configuration information is less than or equal to the second value, the terminal determines that the candidate range for the frequency domain granularity associated with the CSI report is only wideband-based, or the candidate range for the number of subbands is the third range (the value in the third range is less than the value in the first range), or the candidate range for the size of the frequency domain subbands is the fourth range (the value in the fourth range is greater than the value in the second range).

[0104] Through the above implementation methods, existing fields in the DCI can be reused to indicate the frequency domain configuration associated with CSI reports, avoiding the need for network devices to add new fields in the DCI to indicate the frequency domain configuration associated with CSI reports, thus saving DCI overhead.

[0105] In other implementations, the terminal may also determine the frequency domain configuration associated with the CSI report based on the indication of the first network signaling. This can be understood as the network signaling (i.e., the first network signaling) pre-configuring the frequency domain configuration associated with the CSI report for CSI measurements based on DMRS. Alternatively, it can be understood that the network-side device sends a MAC CE (i.e., the first network signaling), and the terminal determines the frequency domain configuration associated with the CSI report based on the MAC CE sent by the network-side device.

[0106] For example, the network RRC signaling pre-configures multiple frequency domain configurations. The network-side device activates one frequency domain configuration through MAC CE (or activates one frequency domain configuration for each PDSCH configuration). When the network-side device triggers a DMRS-based CSI report through DCI, the frequency domain configuration associated with the CSI report is the frequency domain configuration activated by MAC CE, or the frequency domain configuration associated with the CSI report is the frequency domain configuration activated by MAC CE associated with the PDSCH configuration associated with DCI.

[0107] In other implementations, the terminal determines the frequency domain configuration associated with the CSI report based on the indication of the DCI. This can be understood as the network-side device sending the DCI, and the terminal determining the frequency domain configuration associated with the CSI report based on the DCI. Alternatively, the terminal may also determine the frequency domain configuration associated with the CSI report based on the first network signaling and the configuration information associated with the CSI report indicated by the DCI. This can be understood as the network signaling pre-configuring multiple frequency domain configurations, and the network-side device indicating at least one of these frequency domain configurations to the terminal via the DCI.

[0108] For example, the network-side device sends a DCI, and the terminal determines the frequency domain configuration associated with the CSI report based on the DCI. That is, there is a field in the DCI, and based on the indication of the field, the frequency domain configuration associated with the CSI report can be determined, such as the frequency domain granularity, the number of sub-bands, the size of the sub-bands, the location of the measurement sub-bands, etc.

[0109] In some implementations, the terminal may also determine the frequency domain configuration associated with the CSI report based on a number of subbands specified in the protocol, a second network signaling indication, or the DCI indication. This can be understood as the terminal first determining the number of subbands associated with the CSI report, and then further determining the size of each subband based on the number of subbands and at least one of the following: the bandwidth associated with the DMRS and PDSCH, and the RBG size. Using this implementation, network-side devices can configure the same number of subbands for multiple PDSCH configurations or DMRS configurations. Through this operation, even if multiple DMRS configurations are different, they are associated with the same CSI report payload size. This facilitates the network-side device in configuring uplink channel resources carrying CSI reports and reduces network complexity.

[0110] Optionally, the frequency domain configuration associated with the CSI report can be understood as the frequency domain configuration associated with the channel or PMI of the CSI report, or the frequency domain configuration associated with the CQI, SINR, or SNR of the CSI report. Alternatively, it can be understood as the frequency domain configuration associated with the CSI report (e.g., number of subbands, subband size) multiplied by an integer, or the frequency domain configuration associated with the CQI, SINR, or SNR of the CSI report. Optionally, the integer is an integer configured in the network signaling system or agreed upon in the protocol.

[0111] Additionally, it should be noted that the various implementation methods for determining the frequency domain configuration associated with CSI reports described above can also be combined with each other. For example, the frequency domain granularity associated with CSI reports can be determined based on the configuration information of DMRS indicated by the DCI, and the sub-band size associated with CSI reports can be determined based on the configuration information of PDSCH indicated by the DCI.

[0112] S214, The terminal feeds back the CSI report on the uplink channel resources associated with the CSI report.

[0113] In some embodiments, before the terminal feeds back the CSI report on the uplink channel resources associated with the CSI report, the terminal may further determine the report content associated with the CSI report and obtain the CSI report based on the report content associated with the CSI report. Optionally, the report content associated with the CSI report includes at least one of the following: a) channel, i.e., H; b) channel correlation matrix, i.e., H'*H, where H' represents the conjugate transpose of H; c) precoding matrix indicator (PMI); d) channel quality indicator (CQI); e) rank indicator (RI); f) signal-to-noise ratio (SNR); g) signal-to-interference-plus-noise ratio (SINR).

[0114] In some implementations, the terminal can determine the report content associated with the CSI report based on the DMRS configuration information indicated by the DCI. This can be understood as the report content associated with the CSI report being related to the DMRS configuration.

[0115] For example, if the DMRS configuration indicated by the DCI contains a DMRS port for CSI measurements other than the DMRS port associated with PDSCH, then the report content associated with the CSI report may contain an RI.

[0116] For example, if the DMRS configuration indicated by the DCI does not contain a DMRS port for CSI measurements other than the DMRS port associated with PDSCH, then the report content associated with the CSI report will not contain an RI.

[0117] For example, if the DMRS configuration indicated by the DCI does not contain any DMRS ports for CSI measurements other than the DMRS port associated with PDSCH, and the number of DMRS ports associated with PDSCH is 1, then the report content associated with the CSI report does not contain RI or PMI.

[0118] In other implementations, the terminal can determine the report content associated with the CSI report based on the confirmation information feedback time configuration information indicated by the DCI.

[0119] For example, the terminal determines the report content associated with the CSI report based on the feedback time relative to the PDSCH indicated by the confirmation information (including ACK / NACK) feedback time configuration information. Optionally, when the feedback time is greater than or equal to a first value, the terminal determines that the report content associated with the CSI report includes PMI or RI. When the feedback time is less than or equal to a second value (and greater than or equal to a third value), the terminal determines that the report content associated with the CSI report only includes CQI.

[0120] In other implementations, the terminal can determine the report content associated with the CSI report based on a sub-band quantity specified in the protocol or indicated by network signaling. This can be understood as the terminal first determining the number of sub-bands associated with the CSI report, and then determining the report content based on that number of sub-bands. For example, when the number of sub-bands is 1, the report content associated with the CSI report is CQI, signal-to-noise and interference ratio (SINR), or signal-to-noise ratio (SNR). When the number of sub-bands is greater than 1, the report content associated with the CSI report can include at least one of the following: PMI, channel, channel covariance matrix, rank indicator, etc.

[0121] In other implementations, the terminal may also determine the report content associated with the CSI report based on the frequency domain configuration associated with the CSI report. This can be understood as the report content associated with the CSI report being related to the frequency domain configuration of the CSI report.

[0122] In one implementation, the terminal can determine the number M of basis vectors based on the frequency domain configuration associated with the CSI report. The terminal determines that at least five of the report content associated with the CSI report, including the PMI, channel, and channel correlation matrix, are determined based on the M basis vectors, where M is an integer greater than or equal to 0. This approach avoids mismatches between the value of M and the frequency domain configuration of the CSI report, improving the efficiency of the terminal in obtaining the CSI report or reducing the complexity of obtaining the CSI report.

[0123] For example, when the terminal determines that the number of subbands in the CSI report is less than or equal to a specific value, the value of M is 0.

[0124] For example, when the terminal determines that the subband size of the CSI report is greater than or equal to a specific value, the value of M is 0.

[0125] For example, when the terminal determines that the number of subbands in the CSI report is greater than or equal to a specific value, the value of M is a fixed value, which is independent of the number of subbands.

[0126] For example, when the terminal determines that the content associated with the CSI report includes at least two of the following: PMI, channel, and channel correlation matrix, when the terminal determines that the subband size of the CSI report is less than or equal to a specific value, the value of M is a fixed value, which is independent of the subband size.

[0127] In another implementation, the terminal may also determine that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix based on the frequency domain configuration associated with the CSI report. This can also be understood as the terminal determining that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix is ​​related to the frequency domain configuration of the CSI report. This approach maximizes the utilization of the limited feedback overhead of CSI report association, allowing for the feedback of more CSI information within that limited overhead. For example, if the terminal determines that the content associated with the CSI report includes at least two of PMI, channel, and channel correlation matrix, the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix based on the frequency domain configuration of the CSI report.

[0128] For example, when the size of the subband associated with the CSI report is less than or equal to a specific value, the terminal determines that the content associated with the CSI report is channel H.

[0129] For example, when the number of subbands associated with the CSI report is less than or equal to a specific value, the terminal determines that the content associated with the CSI report is channel H.

[0130] For example, when the size of the subband associated with the CSI report is greater than or equal to a specific value, the terminal determines that the content associated with the CSI report is a channel correlation matrix.

[0131] In some embodiments, when a terminal obtains a CSI report, it determines at least one relative CQI value. This relative CQI value is determined based on the modulation and coding scheme (MCS) or code rate associated with the PDSCH, where the PDSCH is the PDSCH indicated by the DCI. For example, when the terminal determines that the content associated with the CSI report includes CQIs, each CQI carried in the CSI report is a relative CQI value (differential CQI value) relative to a reference CQI value, which can be determined based on the modulation and coding scheme (MCS) or code rate associated with the PDSCH indicated by the DCI. Alternatively, another implementation involves the terminal indicating to the network-side device whether each CQI carried in the CSI report is a differential CQI value relative to a reference CQI, or whether each CQI is an absolute CQI value.

[0132] Through the above implementation methods, feedback overhead can be reduced by feeding back a differential CQI value, or a more accurate CQI value can be fed back with limited feedback overhead, or the terminal can determine whether to feed back a more accurate CQI value (differential CQI value) or a CQI value within a larger CQI range (absolute CQI value) with limited feedback overhead.

[0133] For example, the terminal obtains N CQI values ​​based on DMRS, determines a reference CQI value based on the MCS or code rate associated with the PDSCH indicated by DCI, and obtains N differential CQI values ​​relative to the reference CQI value. The terminal carries these N differential CQI values ​​relative to the reference CQI value in a CSI report and feeds them back to the network device.

[0134] For example, the terminal obtains N CQI values ​​based on DMRS, determines a reference CQI value based on the MCS or code rate associated with the PDSCH indicated by DCI, and obtains the payload size associated with each CQI in the CSI report. Based on the payload size, it determines whether the terminal feeds back a differential CQI value or an absolute CQI value. For instance, if the difference between the maximum value of the N CQI values ​​and the reference CQI value is less than a specific value, the terminal feeds back a differential CQI value to the network-side device; if the difference between the maximum value of the N CQI values ​​and the reference CQI value is greater than or equal to a specific value, the terminal feeds back an absolute CQI value to the network-side device.

[0135] In some embodiments, when obtaining a CSI report, at least one MCS relative value or MCS index relative value is determined. This at least one MCS relative value or MCS index relative value is determined based on the MCS or MCS index associated with the PDSCH, or the code rate or modulation scheme, where the PDSCH is the PDSCH indicated by the DCI. This can be understood as the terminal determining the MCS index associated with the PDSCH based on the DCI; typically, one MCS index is associated with a modulation scheme, code rate, or spectral efficiency. Based on the MCS index associated with the PDSCH, the terminal reports at least one relative value or offset of an MCS index in the CSI report. The network-side device can determine the updated MCS index using the relative value or offset and the MCS index associated with the PDSCH indicated by the network device. Optionally, the network device configures the terminal's subsequent PDSCH-associated MCS index based on the updated MCS index to improve transmission efficiency or reliability.

[0136] In some embodiments, before the terminal reports a CSI report, it may also determine the uplink channel resource associated with the CSI report, such as PUCCH or PUSCH. The terminal can then report a CSI report using the determined uplink channel resource.

[0137] In some embodiments, the terminal may determine the uplink channel resource associated with the CSI report based on the DCI indication. For example, the DCI may indicate the uplink channel resource associated with the CSI report. In this implementation, optionally, there may be some limitations on the time gap between the uplink channel resource and the DCI. That is, the terminal does not expect the time gap to be less than a predetermined value. Optionally, the predetermined value is a value agreed upon by the protocol, a value fed back by the terminal, or a value indicated by network signaling. Optionally, the magnitude of the predetermined value is related to the configuration, frequency domain configuration, or content of the CSI report. Furthermore, optionally, there may be some limitations on the time gap between the uplink channel resource and the PDSCH or DMRS indicated by the DCI. That is, the terminal does not expect the time gap to be less than a predetermined value. Optionally, the predetermined value is a value agreed upon by the protocol, a value fed back by the terminal, or a value indicated by network signaling. Optionally, the magnitude of the predetermined value is related to the configuration, frequency domain configuration, or content of the CSI report.

[0138] In some implementations, the terminal can determine that the CSI report is associated with the same uplink channel resource as the acknowledgment information (ACK / NACK) associated with the PDSCH, where the PDSCH is the PDSCH associated with the DCI. For example, in one implementation, if the DCI does not indicate the uplink channel resource associated with the CSI report, the ACK / NACK associated with the PDSCH associated with the DCI is associated with the same uplink channel resource. Alternatively, if network RRC signaling indicates that there is no uplink channel resource in the DCI to indicate the uplink channel resource associated with the CSI report, the ACK / NACK associated with the PDSCH associated with the DCI is associated with the same uplink channel resource. Or, when the reported content associated with the CSI report is specific content, the ACK / NACK associated with the PDSCH associated with the DCI is associated with the same uplink channel resource.

[0139] For example, in another implementation, the terminal determines the uplink channel resources associated with the ACK / NACK indicated by the DCI, and the protocol stipulates that the CSI report and the ACK / NACK associated with the PDSCH associated with the DCI are associated with the same uplink channel resources. Optionally, the terminal determines the uplink channel resources associated with the ACK / NACK associated with the PDSCH associated with the DCI based on higher-layer signaling. Optionally, in this case, the time from PDSCH to ACK / NACK is jointly determined based on a first time associated with the CSI report and a second time from PDSCH to ACK / NACK indicated by the DCI, for example: equal to the first time plus the second time, or the minimum of the first time and the second time, or the maximum of the first time and the second time. For example: if it is greater than a specific time, it is equal to the first time plus the second time, or the minimum of the first time and the second time, or the maximum of the first time and the second time; if it is less than or equal to a specific time, it is equal to the specific time. Optionally, the first time is related to the report content associated with the CSI report or the frequency domain configuration associated with the CSI report.

[0140] In other embodiments, the terminal determines that the uplink channel resource associated with the CSI report is an uplink channel resource indicated by third network signaling or a pre-configured uplink channel resource by third network signaling, wherein the third network signaling includes MAC CE signaling or RRC signaling. In this embodiment, the terminal determines that the CSI report is carried in an uplink channel resource (PUCCH or PUSCH) indicated or activated by MAC CE or RRC signaling for feeding back CSI reports based on DMRS measurements.

[0141] In one implementation, if the DCI does not indicate an uplink channel resource associated with the CSI report, the terminal determines that the CSI report is carried in an uplink channel resource (PUCCH or PUSCH) indicated or activated by MAC CE or RRC signaling for feeding back CSI reports based on DMRS measurements. Optionally, when encountering an uplink channel resource transmission occasion, if the terminal has N CSI reports to be fed back, the terminal carries at least a portion of the N CSI reports in the uplink channel resource and feeds them back to the network. Optionally, when N is greater than 1, the terminal selects only the CSI report closest to the uplink channel resource to feed back to the network. Alternatively, when N is greater than 1, for CSI reports associated with the same carrier or BWP, the terminal selects only the CSI report closest to the uplink channel resource to feed back to the network. Optionally, the value of N is indicated by network signaling, agreed upon by the protocol, or determined based on the terminal's capabilities.

[0142] In another implementation, the terminal determines, based on the DCI indication, that the uplink channel resource associated with the CSI report is one of the uplink channel resources (PUCCH or PUSCH) indicated by MAC CE or RRC signaling. This can be understood as the network-side device indicating a pre-configured uplink channel resource to the terminal via the DCI, and the terminal carrying the CSI report within that uplink channel resource and feeding it back to the network.

[0143] In another implementation, the terminal determines the uplink channel resource associated with the CSI report based on a different DCI than the stated DCI. Optionally, the uplink channel resource is one of the uplink channel resources (PUCCH or PUSCH) indicated by MAC-CE or RRC signaling. This can be understood as the network-side device indicating a pre-configured uplink channel resource to the terminal via a different DCI, and the terminal carrying the CSI report within that uplink channel resource and feeding it back to the network-side device. This method decouples the measurement and feedback of the CSI report, which is more beneficial for the scheduling by the network-side device.

[0144] In some embodiments, when multiple CSI reports need to be carried in the uplink channel resources, all of the CSI reports may be DMRS-based CSI reports, or some may be DMRS-based CSI reports and some may be CSI-RS-based CSI reports. The terminal can determine the priority of the multiple CSI reports and map at least a portion of the CSI reports to the uplink channel resources based on the priority, and then feed this information back to the network-side device. CSI reports with higher priority are mapped to the uplink channel resources first.

[0145] In some implementations, when the plurality of CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI-RS measurements, the terminal determines the priority of the CSI reports based on DMRS measurements and the CSI reports based on CSI-RS measurements, wherein the CSI reports based on CSI-RS measurements take precedence over the CSI reports based on DMRS measurements, that is, the priority of the CSI reports based on DMRS measurements is lower than the priority of the CSI reports based on CSI-RS measurements. Optionally, the priority of the CSI reports based on DMRS measurements associated with the same carrier or bandwidth part (BWP) is lower than the priority of the CSI reports based on CSI-RS measurements.

[0146] In some implementations, when the plurality of CSI reports include a plurality of CSI reports based on DMRS measurements, the terminal determines the priority of each CSI report based on the time-domain location of the DMRS associated with the CSI report, wherein the CSI report whose time-domain location is closer to the uplink channel resource has a higher priority.

[0147] In some embodiments, the terminal may also determine the priority of CSI reports based on the time-domain and frequency-domain locations of the DMRS associated with multiple DMRS-based CSI reports. When the frequency-domain locations are the same, the CSI report whose time-domain location is closer to the uplink channel resource has a higher priority. When the time-domain locations are the same, the CSI report whose frequency-domain location is closer to Point A has a higher priority.

[0148] In some implementations, when the plurality of CSI reports include a plurality of DMRS-based measurement CSI reports associated with different serving cell identifiers, the terminal determines the priority of each DMRS-based measurement CSI report based on the serving cell identifier of the DMRS associated with the CSI report, wherein the CSI report with a smaller serving cell identifier has a higher priority.

[0149] The terminal maps at least a portion of the multiple CSI reports to uplink channel resources based on the aforementioned priority and feeds them back to the network-side equipment. One implementation is as follows: the terminal determines which CSI reports are mapped to uplink channel resources and feeds them back to the network-side equipment. For example, when a CSI report based on DMRS measurement is associated with the same PUCCH or PUSCH as a CSI report based on CSI-RS measurement, the terminal only feeds back the CSI report based on CSI-RS measurement. Another example is when a CSI report based on DMRS measurement is associated with the same carrier or BWP as a CSI report based on CSI-RS measurement, the terminal only feeds back the CSI report based on CSI-RS measurement. This is equivalent to the CSI report based on CSI-RS measurement having a higher priority than the CSI report based on DMRS measurement. This avoids redundant feedback of some CSI information, preventing wasted feedback overhead. Another implementation is as follows: the terminal determines N CSI reports to map to uplink channel resources and feeds them back to the network-side equipment. N is a value specified by network signaling indication or protocol. For example, network signaling instructs the terminal to map one of the multiple CSI reports, obtained based on DMRS, to uplink channel resources based on the priority.

[0150] In some embodiments, the uplink channel resource may be associated with at least one CSI report and at least one transport block (TB). In this case, the terminal may, based on network signaling instructions or protocol agreements, only feed back one of the at least one CSI reports (or not feed back the CSI report, or not feed back the transport block). Optionally, when the at least one CSI report includes multiple CSI reports based on DMRS measurements, the terminal determines that the highest priority CSI report based on DMRS measurements is simultaneously carried on the uplink channel resource along with the TB. Optionally, when the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal (RS) measurements, the terminal determines that the highest priority CSI report based on CSI-RS measurements is simultaneously carried on the uplink channel resource along with the TB. In this way, the ratio of CSI report payload size to data payload size on an uplink channel resource can be controlled, avoiding unclear network ratios, multiple blind decodings, and increased complexity.

[0151] In some embodiments, before the terminal obtains the CSI report, the time-domain or frequency-domain location of the DMRS associated with the CSI report can also be determined.

[0152] In some implementations, the terminal may determine, based on a fourth network signaling or protocol, that all DMRS symbols associated with a target DMRS occasion are used to obtain the CSI report, wherein the target DMRS occasion is at least one of all DMRS occasions. Optionally, the target DMRS occasion may be a DMRS occasion in all DMRS time slots where an additional DMRS port for CSI measurement exists. That is, the fourth network signaling indicates or the protocol stipulates that, among all DMRS occasions, all DMRS symbols associated with a DMRS occasion where an additional DMRS port for CSI measurement exists are used to obtain the CSI report. Optionally, the fourth network signaling may be DCI signaling, for example, a 2-bit field in the DCI signaling indicating the time domain location of the DMRS associated with obtaining the CSI report.

[0153] In some implementations, the terminal may determine, based on fifth network signaling or protocol conventions, that a portion of the RBs among all RBs associated with the DMRS are used to obtain the CSI report. Optionally, the portion of RBs may be RBs of additional DMRS ports used for CSI measurement; that is, the fifth network signaling indicates or the protocol convention stipulates that among all RBs associated with the DMRS, there are RBs of additional DMRS ports used for CSI measurement that are used to obtain the CSI report. Optionally, for the above implementations, there may be different densities of different DMRS ports on the same OFDM symbol, or different numbers of REs associated with different DMRS ports. Therefore, there may be different Energy per Resource Element (EPRE) values ​​for different DMRS ports, which may affect subsequent PDSCH demodulation. One solution is to independently configure the EPRERatio or offset between each DMRS port and the PDSCH using network signaling, or independently configure the EPRERatio or offset between each group of DMRS ports and the PDSCH, and the terminal adjusts the estimated channel for data demodulation. Another solution is to configure the network signaling to share an EPRERatio or offset with the PDSCH across all DMRS ports. The terminal then determines the EPRERatio or offset for each DMRS port with the PDSCH based on the density ratio or RE ratio between DMRS ports, or independently configures the EPRERatio or offset for each group of DMRS ports with the PDSCH. Finally, the terminal adjusts the estimated channel for data demodulation. Both solutions can be wideband granular adjustment (i.e., adjusting the same value for any DMRS port across all bandwidths) or PRB granular adjustment (i.e., the adjusted value for any DMRS port may not be exactly the same in different bandwidth segments, or the adjusted values ​​for different bandwidth segments are determined independently).

[0154] Through the above implementation methods, network-side devices and terminals can clearly define the time-domain or frequency-domain location used to obtain CSI reports, thereby avoiding performance loss caused by inconsistent understanding between network-side devices and terminals.

[0155] The technical solution provided in this application embodiment allows the terminal to determine, based on the DCI sent by the network-side device, that it has obtained a CSI report using DMRS. Then, based on the measurement results obtained by measuring the DMRS associated with the CSI report, the terminal obtains the CSI report and feeds it back on the uplink channel resources associated with the CSI report. This enables the terminal to obtain at least the CSI of a local channel based on DMRS, thus avoiding the problem of excessive CSI-RS overhead caused by the terminal always obtaining CSI based on CSI-RS.

[0156] Figure 3 shows another flowchart of the CSI report feedback method provided in the embodiments of this application. As shown in Figure 3, the method 300 mainly includes the following steps.

[0157] S310, the terminal receives the downlink DCI, and based on the downlink DCI, determines that the terminal obtains the CSI report based on DMRS.

[0158] In some embodiments, the terminal may determine the CSI report obtained by the terminal based on the DMRS based on a field of at least 1 bit length in the downlink DCI.

[0159] One implementation involves a 1-bit field in the downlink DCI, used to indicate whether the terminal obtains a CSI report based on the DMRS indicated by the current downlink DCI. For example, when the 1-bit field value is 1, the downlink DCI is associated with a DMRS-based CSI report; when the 1-bit field value is 0, the downlink DCI is not associated with a DMRS-based CSI report, or the downlink DCI does not trigger a DMRS-based CSI report. Optionally, the frequency domain configuration and report content associated with the DMRS-based CSI report can be agreed upon by the protocol.

[0160] Another implementation is as follows: the downlink DCI contains a field greater than or equal to 1 bit, which is used to indicate whether the terminal obtains a CSI report based on the DMRS indicated by the downlink DCI. Optionally, if the length of the field is greater than 1 bit, the field is also used for at least one of the following functions:

[0161] 1) Indicates the configuration information of the CSI report; the field indicating the configuration information of the CSI report can be understood as: the field is also used to indicate parameters that need to be determined during the acquisition of a CSI report. For example: reference signal configuration, frequency domain configuration of the CSI report, CSI report content, CSI report reporting configuration, etc.

[0162] For example, a field associated with N bits has a total of 2^N codepoints. One codepoint indicates that the current DCI is not associated with a CSI report. The remaining 2^N-1 codepoints are associated with the configuration information of at most 2^N-1 CSI reports. The configuration information of each CSI report is associated with an RRC signaling, and the associated RRC signaling contains the configuration information associated with the CSI report.

[0163] 2) Indicates the configuration information of the DMRS associated with the PDSCH; the field indicating the configuration information of the DMRS can be understood as: the field is also used to indicate at least one of the following: the number of DMRS ports associated with the PDSCH, the port number of the DMRS associated with the PDSCH, the frequency domain configuration of the DMRS associated with the PDSCH, the time domain configuration of the DMRS associated with the PDSCH, and the CDM group configuration of the DMRS associated with the PDSCH.

[0164] For example, a field associated with N bits is associated with 2^N codepoints. Each codepoint can determine at least one of the following: a DMRS port indication, the number of CDM groups without data, or the number of front-load symbols. Furthermore, at least some of the codepoints can also determine that the terminal is obtaining a CSI report based on the DMRS indicated by the current DCI.

[0165] 3) Indicates the configuration information of the DMRS used to measure CSI;

[0166] The field indicating the configuration information of the DMRS used to measure CSI can be understood to mean that the field is also used for at least one of the following:

[0167] Indicates the number of DMRS ports used to measure CSI;

[0168] Indicates the DMRS port number used for CSI measurement;

[0169] Indicates the time-domain configuration of the DMRS used to measure CSI, such as the position of the time-domain symbols;

[0170] Configure the frequency domain configuration of the DMRS used to measure CSI, such as the location of the frequency domain RBG.

[0171] For example, a field associated with N bits is associated with 2^N codepoints, one of which is used to indicate that the current DCI is not associated with a CSI report, and at least some of the remaining codepoints (indicating that the current DCI is associated with a CSI report) can determine the configuration information of the DMRS used to measure CSI.

[0172] 4) Instruct CSI to report the associated PUCCH resource information;

[0173] For example, a field associated with N bits is associated with 2^N codepoints, where one codepoint indicates that the current DCI is not associated with a CSI report, and at least a portion of the remaining codepoints (indicating that the current DCI is associated with a CSI report) can determine the PUCCH resource used for CSI feedback.

[0174] 5) Instruct CSI to report the associated PUSCH resource information;

[0175] For example, a field associated with N bits is associated with 2^N codepoints, where one codepoint indicates that the current DCI is not associated with a CSI report, and at least a portion of the remaining codepoints (indicating that the current DCI is associated with a CSI report) can determine the PUSCH resource used for CSI feedback.

[0176] 6) Indicates the feedback time information for the acknowledgment information (ACK / NACK) associated with PDSCH;

[0177] For example, a field associated with N bits is associated with 2^N codepoints, where some codepoints are used to indicate that the current DCI is not associated with CSI reports and ACK / NACK feedback time information, and some codepoints indicate that the current DCI is associated with CSI reports and ACK / NACK feedback time information.

[0178] For example, a field associated with N bits is associated with 2^N codepoints, where at least some codepoints are used to indicate ACK / NACK feedback time information. In addition, the protocol stipulates or the network higher layer signaling indicates the correspondence between ACK / NACK feedback time information and DCI-associated CSI reports or DCI-unassociated CSI reports. Based on the determined ACK / NACK feedback time information, the terminal further determines whether the downlink DCI-associated or unassociated CSI report is used.

[0179] The above implementation method allows a single DCI to be used to indicate both the configuration information of the DMRS and the configuration information of a CSI report associated with the DMRS. This avoids using two separate DCIs to indicate the configuration information of the DMRS and the CSI report, thus saving DCI overhead.

[0180] S312, the terminal determines the time and frequency resources and port configuration of DMRS.

[0181] For example, if the above field indicates the configuration information of the DMRS used to measure CSI, the terminal can determine the time-frequency resources and port configuration of the DMRS based on the search of the above field.

[0182] Optionally, the terminal can also determine the frequency domain configuration associated with the CSI report in order to obtain the CSI report based on the frequency domain configuration associated with the CSI report.

[0183] The frequency domain configuration associated with the CSI report includes at least one of the following: a) the frequency domain granularity associated with the CSI report; b) the number of frequency domain sub-bands associated with the CSI report; c) the size of the frequency domain sub-bands associated with the CSI report; d) the position of the frequency domain sub-bands associated with the CSI report.

[0184] One implementation of determining the frequency domain configuration associated with CSI reports is as follows: the terminal determines the frequency domain configuration associated with CSI reports based on the DMRS configuration indicated by the downlink DCI. This can be understood as the frequency domain configuration associated with CSI reports being related to the DMRS configuration.

[0185] For example, when the bandwidth associated with the DMRS indicated by the downlink DCI is less than a predetermined value, the frequency domain granularity associated with the CSI report is broadband, that is, all CSI content included in the CSI report is broadband, or the number is 1.

[0186] For example, when the number of ports associated with DMRS indicated by the downlink DCI is greater than a predetermined value, the frequency domain granularity associated with the CSI report is broadband, that is, all CSI content included in the CSI report is broadband, or the number is 1.

[0187] For example, when the number of DMRS ports associated with the PDSCH indicated by the downlink DCI is greater than the agreed value, the frequency domain granularity associated with the CSI report is wideband, that is, all CSI content included in the CSI report is wideband, or the number is 1.

[0188] For example, if the ports associated with the DMRS indicated by the downlink DCI are non-uniform in the frequency domain, that is, some RBs have additional DMRS ports for CSI measurement, while some RBs do not have additional DMRS ports for CSI measurement, then the CSI report indicates the location of the associated frequency domain subband where additional DMRS ports for CSI measurement exist.

[0189] For example, the protocol stipulates the correspondence between the bandwidth of DMRS and the number of frequency domain subbands associated with CSI reports. When the bandwidth associated with DMRS indicated by DCI is the agreed value, the terminal can determine the number of frequency domain subbands associated with CSI reports based on the correspondence.

[0190] For example, the protocol stipulates the correspondence between the bandwidth of DMRS and the size of the frequency domain subband associated with the CSI report. When the bandwidth associated with DMRS indicated by DCI is the agreed value, the terminal can determine the size of the frequency domain subband associated with the CSI report based on the correspondence.

[0191] Another implementation of determining the frequency domain configuration associated with the CSI report is as follows: the terminal determines the frequency domain configuration associated with the CSI report based on the configuration of the PDSCH indicated by the downlink DCI.

[0192] For example, the terminal determines the size of the RBG associated with the PDSCH based on the downlink DCI indication, and based on the size of the RBG, the terminal determines the frequency domain granularity or the number or size of the frequency domain subbands associated with the CSI report.

[0193] For example, the terminal determines the size of the RBG associated with the PDSCH based on the downlink DCI indication, and based on the size of the RBG and an integer of the network signaling indication, the terminal determines the frequency domain granularity or the number or size of the frequency domain subbands associated with the CSI report.

[0194] For example, the terminal determines the bandwidth associated with the PDSCH based on the downlink DCI indication, and based on the bandwidth, the terminal determines the frequency domain granularity, the number of frequency domain subbands, or the size of the frequency domain subbands associated with the CSI report. This can also be understood as: the frequency domain granularity, the number of frequency domain subbands, or the size of the frequency domain subbands associated with the CSI report are related to the bandwidth associated with the PDSCH.

[0195] Another implementation of determining the frequency domain configuration associated with the CSI report is as follows: the terminal determines the frequency domain configuration associated with the CSI report based on the ACK / NACK feedback time configuration indicated by the downlink DCI.

[0196] For example, the terminal determines the frequency domain granularity, the number of frequency domain subbands, or the size of the frequency domain subbands associated with the CSI report based on the ACK / NACK feedback time of the downlink DCI indication. Optionally, when the feedback time is greater than or equal to a first value, the terminal determines that the frequency domain granularity associated with the CSI report is subband-based, or the number of subbands is a first number, or the size of the frequency domain subband is a first size. When the feedback time is less than or equal to a second value, the terminal determines that the frequency domain granularity associated with the CSI report is wideband-based, or the number of subbands is a second number (the second number is less than the first number), or the size of the frequency domain subband is a second size (the second size is greater than the first size).

[0197] For example, the terminal determines the candidate range for the frequency domain granularity associated with the CSI report, the candidate range for the number of frequency domain subbands, or the candidate range for the size of the frequency domain subbands based on the ACK / NACK feedback time of the downlink DCI indication. Optionally, when the feedback time is greater than or equal to a first value, the terminal determines that the candidate range for the frequency domain granularity associated with the CSI report is either subband-based or wideband-based, or the candidate range for the number of subbands is the first range, or the candidate range for the size of the frequency domain subbands is the second range. When the feedback time is less than or equal to the second value, the terminal determines that the candidate range for the frequency domain granularity associated with the CSI report is only wideband-based, or the candidate range for the number of subbands is the third range (the value in the third range is less than the value in the first range), or the candidate range for the size of the frequency domain subbands is the fourth range (the value in the fourth range is greater than the value in the second range).

[0198] The above implementation method allows for the reuse of existing DCI fields to indicate the frequency domain configuration associated with CSI reports, avoiding the need for network devices to add new fields to the DCI to indicate the frequency domain configuration associated with CSI reports, thus saving DCI overhead.

[0199] Another implementation of determining the frequency domain configuration associated with CSI reports is as follows: the terminal determines the frequency domain configuration associated with CSI reports based on network signaling. This can be understood as: the network signaling pre-configures the frequency domain configuration associated with CSI measurements based on DMRS. Alternatively, it can be understood as: the network signaling pre-configures multiple frequency domain configurations, and the network-side device indicates at least one of these configurations to the terminal via DCI. It can also be understood as: the network-side device sends downlink DCI, and the terminal determines the frequency domain configuration associated with CSI reports based on the downlink DCI. Finally, it can be understood as: the network-side device sends MAC CE, and the terminal determines the frequency domain configuration associated with CSI reports based on the MAC CE sent by the network-side device.

[0200] For example, the network RRC signaling pre-configures multiple frequency domain configurations. The network-side device activates one frequency domain configuration through MAC CE (or activates one frequency domain configuration for each PDSCH configuration). When the network-side device triggers a DMRS-based CSI report through downlink DCI, the frequency domain configuration associated with the CSI report is the frequency domain configuration activated by MAC CE, or the frequency domain configuration associated with the CSI report is the frequency domain configuration activated by MAC associated with the PDSCH configuration associated with DCI.

[0201] For example, the network-side device sends downlink DCI, and the terminal determines the frequency domain configuration associated with the CSI report based on the downlink DCI. That is, there is a field in the DCI, and based on the indication of the field, the frequency domain configuration associated with the CSI report can be determined (e.g., frequency domain granularity, number of sub-bands, size of sub-bands, location of measurement sub-bands, etc.).

[0202] The above implementation method enables the use of downlink DCI or MAC-CE to instruct the frequency domain configuration associated with the CSI report, thereby improving the flexibility of network configuration.

[0203] Another implementation of determining the frequency domain configuration associated with CSI reports is as follows: the terminal determines the frequency domain configuration associated with CSI reports based on a number of subbands specified in the protocol or indicated by network signaling. This can be understood as: the terminal first determines the number of subbands associated with the CSI reports, and then determines the size of each subband based on the number of subbands and the bandwidth or RBG size associated with the DMRS or PDSCH. One advantage of this implementation is that network-side devices can configure the same number of subbands for multiple PDSCH or DMRS configurations. This ensures that even if multiple DMRS configurations are different, they still associate the same CSI report payload size. This facilitates network configuration of uplink channel resources carrying CSI reports and reduces network complexity.

[0204] Optionally, the frequency domain configuration associated with the CSI report can be understood as the frequency domain configuration associated with the channel or PMI of the CSI report, or the frequency domain configuration associated with the CQI, SINR, or SNR of the CSI report. Alternatively, it can be understood as the frequency domain configuration associated with the CSI report (e.g., number of subbands, subband size) multiplied by an integer, or the frequency domain configuration associated with the CQI, SINR, or SNR of the CSI report. Optionally, the integer is an integer configured in the network signaling system or agreed upon in the protocol.

[0205] S314, the terminal performs channel estimation based on DMRS and obtains a CSI report.

[0206] In this step, the terminal can perform channel measurements based on DMRS and obtain a CSI report based on the measurement results.

[0207] Before the terminal feeds back the CSI report, it can also determine the report content associated with the CSI report. The CSI report is then obtained based on the associated report content. The associated report content includes at least one of the following: a) channel, i.e., H; b) channel correlation matrix, i.e., H'*H, where H' represents the conjugate transpose of H; c) PMI; d) CQI; e) RI; f) signal-to-noise ratio / signal-to-interference-plus-noise ratio.

[0208] One implementation method for a terminal to determine the report content associated with the CSI report is as follows: the terminal determines the report content associated with the CSI report based on the DMRS configuration indicated by the downlink DCI. This can be understood as the report content associated with the CSI report being related to the DMRS configuration.

[0209] For example, if the DMRS configuration of the downlink DCI indicates the presence of a DMRS port for CSI measurements other than the DMRS port associated with PDSCH, then the report content associated with the CSI report may contain an RI.

[0210] For example, if the DMRS configuration of the downlink DCI indication does not contain a DMRS port for CSI measurement other than the DMRS port associated with PDSCH, then the report content associated with the CSI report will not contain an RI.

[0211] For example, if the DMRS configuration of the downlink DCI indication does not contain any DMRS ports for CSI measurement other than the DMRS port associated with PDSCH, and the number of DMRS ports associated with PDSCH is 1, then the report content associated with the CSI report does not contain RI or PMI.

[0212] Another implementation method for the terminal to determine the report content associated with the CSI report is as follows: the terminal determines the report content associated with the CSI report based on the ACK / NACK feedback time configuration of the downlink DCI indication.

[0213] For example, the terminal determines the report content associated with the CSI report based on the feedback time of the ACK / NACK of the downlink DCI indication relative to the PDSCH. Optionally, when the feedback time is greater than or equal to a first value, the terminal determines that the report content associated with the CSI report includes PMI or RI. When the feedback time is less than or equal to a second value (and greater than or equal to a third value), the terminal determines that the report content associated with the CSI report only includes CQI.

[0214] Another implementation method for the terminal to determine the report content associated with the CSI report is as follows: the terminal determines the report content associated with the CSI report based on a sub-band quantity specified in the protocol or network signaling. This can be understood as: the terminal first determines the number of sub-bands associated with the CSI report, and then determines the report content associated with the CSI report based on the number of sub-bands. For example: when the number of sub-bands is 1, the report content associated with the CSI report is CQI, SINR, or SNR. When the number of sub-bands is greater than 1, the report content associated with the CSI report may include PMI, channel, channel covariance matrix, or rank, etc.

[0215] Optionally, when the terminal determines that the content associated with the CSI report includes CQI, each CQI carried in the CSI report is a differential CQI value relative to a reference CQI value, which is determined based on the MCS or code rate associated with the PDSCH indicated by the DCI. Alternatively, another implementation is that the terminal indicates to the network-side device whether each CQI carried in the CSI report is a differential CQI value relative to a reference CQI, or whether each CQI is an absolute CQI value.

[0216] Through the above implementation methods, feedback overhead can be reduced by feeding back a differential CQI value, or a more accurate CQI value can be fed back with limited feedback overhead, or the terminal can determine whether to feed back a more accurate CQI value (differential CQI value) or a CQI value within a larger CQI range (absolute CQI value) with limited feedback overhead.

[0217] For example, the terminal obtains N CQI values ​​based on DMRS, determines a reference CQI value based on the MCS or code rate associated with the PDSCH indicated by the downlink DCI, and obtains N differential CQI values ​​relative to the reference CQI value. The terminal carries these N differential CQI values ​​relative to the reference CQI value in a CSI report and feeds them back to the network device.

[0218] For example, the terminal obtains N CQI values ​​based on DMRS, determines a reference CQI value based on the MCS or code rate associated with the PDSCH indicated by the downlink DCI, and obtains the payload size associated with each CQI in the CSI report. Based on the payload size, it determines whether the terminal feeds back a differential CQI value or an absolute CQI value. For instance, if the difference between the maximum value of the N CQI values ​​and the reference CQI value is less than a certain value, the terminal feeds back a differential CQI value to the network; if the difference between the maximum value of the N CQI values ​​and the reference CQI value is greater than or equal to a certain value, the terminal feeds back an absolute CQI value to the network-side device.

[0219] Optionally, when the terminal determines that the content associated with the CSI report includes a PMI, a channel, or a channel correlation matrix, the PMI, channel, or channel correlation matrix is ​​determined based on M basis vectors, where M is greater than or equal to 0. Furthermore, the value of M is determined based on the frequency domain configuration of the CSI report. This approach avoids situations where the value of M does not match the frequency domain configuration of the CSI report, improving the efficiency of the terminal in obtaining the CSI report or reducing the complexity of the terminal in obtaining the CSI report.

[0220] For example, when the terminal determines that the number of subbands in the CSI report is less than or equal to a specific value, the value of M is 0.

[0221] For example, when the terminal determines that the subband size of the CSI report is greater than or equal to a specific value, the value of M is 0.

[0222] For example, when the terminal determines that the number of subbands in the CSI report is greater than or equal to a specific value, the value of M is a fixed value, which is independent of the number of subbands.

[0223] For example, when the terminal determines that the subband size of the CSI report is less than or equal to a specific value, the value of M is a fixed value, which is independent of the subband size.

[0224] Optionally, when the terminal determines that the content associated with the CSI report includes at least two of the following: PMI, channel, and channel correlation matrix, the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix based on the frequency domain configuration of the CSI report. This can also be understood as: the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix, which is related to the frequency domain configuration of the CSI report. This approach maximizes the utilization of the limited feedback overhead of CSI report association, allowing for the feedback of more CSI information within a limited feedback overhead.

[0225] For example, when the size of the subband associated with the CSI report is less than or equal to a specific value, the terminal determines that the content associated with the CSI report is channel H.

[0226] For example, when the number of subbands associated with the CSI report is less than or equal to a specific value, the terminal determines that the content associated with the CSI report is channel H.

[0227] For example, when the size of the subband associated with the CSI report is greater than or equal to a specific value, the terminal determines that the content associated with the CSI report is a channel correlation matrix.

[0228] Optionally, when the terminal determines that the content associated with the CSI report includes at least two of the following: PMI, channel, and channel correlation matrix, the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix based on the report content of the CSI report. This can also be understood as: the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix that is related to the report content of the CSI report.

[0229] For example, when the report content associated with the CSI report includes RI, the content associated with the CSI report includes PMI, but does not include the channel or channel correlation matrix.

[0230] For example, when the CSI report content includes CQI, the CSI report content includes PMI, but excludes the channel or channel correlation matrix.

[0231] Optionally, when the terminal determines that the content associated with the CSI report includes a channel, the terminal also needs to determine the frequency domain location associated with the channel, and further, the terminal obtains the channel based on the frequency domain location. This can be understood as: the terminal not only determines the number or size of the frequency domain sub-bands associated with the CSI report, but if the terminal obtains and reports channel H, the terminal can also determine the specific frequency domain location within each frequency domain sub-band associated with channel H. One implementation method is: the terminal determines the frequency domain location based on network signaling instructions or protocol agreements.

[0232] For example, the terminal determines the first RB associated with each subband in the CSI report as the frequency domain location associated with the channel.

[0233] For example, the terminal determines the first 4 REs or first 6 REs of the first RB associated with each subband associated with the CSI report as the frequency domain location of the channel associated.

[0234] In some embodiments, before the terminal sends out a CSI report, the terminal may also determine the time-domain location of the DMRS associated with the CSI report. The time-domain location may be a symbol of all associated DMRSs indicated by the DCI, or it may be a subset of the symbols of all associated DMRSs indicated by the DCI.

[0235] One implementation method for the terminal to determine the temporal location of the DMRS associated with the CSI report is as follows: the network signaling indicates that all symbols of the associated DMRS indicated by the DCI are used to obtain the CSI report, and the terminal determines that all symbols of the associated DMRS are used to obtain the CSI report based on the network signaling indication.

[0236] Another implementation of the terminal determining the temporal location of the DMRS associated with the CSI report is as follows: network signaling instructs a portion of the symbols from all associated DMRSs indicated by the DCI to be used to obtain the CSI report. Based on the network signaling instruction, the terminal determines a portion of the symbols from all associated DMRSs to be used to obtain the CSI report.

[0237] Another implementation method for the terminal to determine the time-domain location of the DMRS associated with the CSI report is as follows: Network signaling indicates or the protocol stipulates that among all the symbols of the associated DMRS indicated by the DCI, the symbols of additional DMRS ports used for CSI measurement are all used to obtain the CSI report. Based on the network signaling indication, the terminal determines that the symbols of the additional DMRS ports used for CSI measurement among all the symbols of the associated DMRS are used to obtain the CSI report.

[0238] Another implementation method for the terminal to determine the temporal location of the DMRS associated with the CSI report is as follows: The protocol stipulates that among all the symbols of all associated DMRS indicated by the downlink DCI, the first symbol or all symbols associated with the first DMRS occasion (e.g., front-loaded DMRS) are used to obtain the CSI report. Based on the protocol agreement, the terminal determines that the first symbol of all associated DMRS indicated by the downlink DCI or all symbols associated with the first DMRS occasion are used to obtain the CSI report.

[0239] Another implementation of the terminal determining the time-domain location of the DMRS associated with the CSI report is as follows: The protocol stipulates that if the DMRS is associated with two occasions, all DMRS symbols associated with the first occasion are used to obtain the CSI report. The protocol also stipulates that if the DMRS is associated with three occasions, all DMRS symbols associated with the second occasion are used to obtain the CSI report. The terminal determines the symbol used to obtain the CSI report based on this protocol. For example, if the downlink DCI indicates that a 4-port DMRS is associated with three OFDM symbols, the terminal assumes that the second DMRS occasion (i.e., the second OFDM symbol) is used to obtain the CSI report. Similarly, if the downlink DCI indicates that an 8-port DMRS is associated with two DMRS occasions, each occasion associated with two OFDM symbols, the terminal assumes that the first DMRS occasion (i.e., the first two OFDM symbols) is used to obtain the CSI report.

[0240] In some embodiments, before the terminal reports a CSI report, the terminal may also determine the frequency domain location associated with the DMRS associated with the CSI report. The frequency domain location may be a RB of all associated DMRSs indicated by the DCI, or it may be a subset of RBs among all associated DMRSs indicated by the DCI.

[0241] One implementation method for the terminal to determine the frequency domain location of the DMRS associated with the CSI report is as follows: network signaling instructs all RBs of the associated DMRS indicated by the downlink DCI to be used to acquire the CSI report. The terminal determines the RB used to acquire the CSI report based on the network signaling instruction.

[0242] Another implementation of the terminal determining the frequency domain location of the DMRS associated with the CSI report is as follows: network signaling instructs a portion of the RBs (RBs) of all associated DMRSs indicated by the downlink DCI to be used for acquiring the CSI report. The terminal determines the RBs used for acquiring the CSI report based on the network signaling instruction.

[0243] Another implementation method for the terminal to determine the frequency domain location of the DMRS associated with the CSI report is as follows: Network signaling indicates or the protocol stipulates that among all the RBs of the associated DMRS indicated by the downlink DCI, RBs with additional DMRS ports used for CSI measurement are all used to acquire the CSI report. The terminal determines the RB used to acquire the CSI report based on the network signaling indication or protocol stipulation.

[0244] S316, the terminal determines the uplink channel resources associated with the CSI report.

[0245] In this step, the terminal determines the uplink channel resources that carry the CSI report, such as PUCCH or PUSCH.

[0246] One implementation of the terminal determining the uplink channel resource associated with the CSI report is as follows: the terminal determines the uplink channel resource associated with the CSI report based on the downlink DCI indication. Optionally, when the downlink DCI does not indicate the uplink channel resource associated with the CSI report, the CSI report is associated with the same uplink channel resource as the ACK / NACK associated with the PDSCH associated with the downlink DCI. Alternatively, when network RRC signaling indicates that there is no uplink channel resource associated with the CSI report in the downlink DCI, the CSI report is associated with the same uplink channel resource as the ACK / NACK associated with the PDSCH associated with the downlink DCI.

[0247] Another implementation of the terminal determining the uplink channel resources associated with the CSI report is as follows: The terminal determines the uplink channel resources associated with the ACK / NACK indicated by the downlink DCI, and the protocol stipulates that the CSI report and the ACK / NACK associated with the PDSCH associated with the downlink DCI are associated with the same uplink channel resources. Further, optionally, the terminal determines the uplink channel resources associated with the ACK / NACK associated with the PDSCH associated with the CSI report and the DCI based on higher-layer signaling. Optionally, in this case, the PDSCH to ACK / NACK time is jointly determined based on a first time associated with the CSI report and a second time associated with the PDSCH to ACK / NACK indicated by the DCI, for example, equal to the first time plus the second time. Optionally, the first time is related to the report content associated with the CSI report.

[0248] Another implementation of the terminal determining the uplink channel resource associated with the CSI report is as follows: When the DCI does not indicate the uplink channel resource associated with the CSI report, the CSI report is carried in the uplink channel resource (PUCCH or PUSCH) indicated or activated by MAC-CE or RRC signaling for feeding back CSI reports based on DMRS measurements. Optionally, when encountering a transmission occasion for the uplink channel resource indicated by MAC-CE or RRC signaling, if the terminal has N CSI reports to be fed back, the terminal carries at least a portion of the N CSI reports in the uplink channel resource and feeds them back to the network. Optionally, when N is greater than 1, the terminal selects the CSI report closest to the uplink channel resource to feed back to the network. Alternatively, when N is greater than 1, for CSI reports associated with the same carrier or BWP, the terminal only selects the CSI report closest to the uplink channel resource to feed back to the network. Optionally, the value of N is indicated by network signaling, agreed upon by the protocol, or determined based on the terminal's capabilities.

[0249] Another implementation method for the terminal to determine the uplink channel resource associated with the CSI report is as follows: the terminal determines, based on the downlink DCI indication, that the uplink channel resource associated with the CSI report is one of the uplink channel resources (PUCCH or PUSCH) indicated by MAC-CE or RRC signaling. This can be understood as follows: the network-side device indicates a pre-configured uplink channel resource to the terminal via the downlink DCI, and the terminal carries the CSI report in the uplink channel resource and feeds it back to the network.

[0250] Another implementation of the terminal determining the uplink channel resource associated with the CSI report is as follows: the terminal determines the uplink channel resource associated with the CSI report based on another DCI different from the downlink DCI. Optionally, the uplink channel resource is one of the uplink channel resources (PUCCH or PUSCH) indicated by MAC-CE or RRC signaling. This can be understood as: the network-side device indicates a pre-configured uplink channel resource to the terminal through another DCI, and the terminal carries the CSI report in the uplink channel resource and feeds it back to the network. This method decouples the measurement and feedback of the CSI report, which is more conducive to the scheduling of network devices.

[0251] S318, the terminal feeds back the CSI report in the uplink channel resources.

[0252] In this step, the terminal transmits the CSI report to the network-side equipment via uplink channel resources (PUCCH / PUSCH).

[0253] Optionally, when the uplink channel resources need to carry multiple CSI reports (all CSI reports can be CSI reports based on DMRS measurements, or some CSI reports can be CSI reports based on DMRS measurements and some CSI reports can be CSI reports based on CSI-RS measurements), the terminal can further determine the priority of the multiple CSI reports, and map at least some of the CSI reports to the uplink channel resources based on the priority, and feed this information back to the network-side device. The CSI reports with higher priority are mapped to the uplink channel resources first.

[0254] In some implementations, determining the priority of multiple CSI reports by the terminal may include: the terminal determining the priority of multiple CSI reports based on DMRS measurements; the terminal determining the priority of CSI reports based on the time domain location of the DMRS associated with the CSI reports; and the CSI reports whose time domain location is closer to the uplink channel resources have higher priority.

[0255] In some implementations, determining the priority of multiple CSI reports by the terminal may include: the terminal determining the priority of multiple CSI reports based on DMRS measurements; the terminal determining the priority of CSI reports based on the time-domain and frequency-domain locations of the DMRS associated with the CSI reports; when the frequency-domain locations are the same, the CSI report whose time-domain location is closer to the uplink channel resource has a higher priority; when the time-domain locations are the same, the CSI report whose frequency-domain location is closer to Point A has a higher priority.

[0256] In some implementations, determining the priority of multiple CSI reports by the terminal may include: the terminal determining the priority of CSI reports based on DMRS measurements and CSI reports based on CSI-RS measurements. Optionally, the priority of CSI reports based on DMRS measurements is lower than the priority of CSI reports based on CSI-RS measurements. Optionally, CSI reports based on DMRS measurements associated with the same carrier or BWP have a lower priority than CSI reports based on CSI-RS measurements.

[0257] In some implementations, the terminal maps at least a portion of the multiple CSI reports to uplink channel resources based on the aforementioned priority and feeds them back to the network-side equipment. The terminal can determine which CSI reports are mapped to uplink channel resources and feed them back to the network. For example, when a CSI report based on DMRS measurement is associated with the same PUCCH or PUSCH as a CSI report based on CSI-RS measurement, the terminal feeds back the CSI report based on CSI-RS measurement. As another example, when a CSI report based on DMRS measurement is associated with the same carrier or BWP as a CSI report based on CSI-RS measurement, the terminal feeds back the CSI report based on CSI-RS measurement. This is equivalent to the CSI report based on CSI-RS measurement having a higher priority than the CSI report based on DMRS measurement. In this way, duplicate feedback of some CSI information can be avoided, preventing wasted feedback overhead.

[0258] Figure 4 shows another flowchart of the CSI report feedback method provided in the embodiments of this application. As shown in Figure 4, the method 400 mainly includes the following steps.

[0259] S410, the terminal receives the uplink DCI, and based on the uplink DCI, determines that the terminal obtains the CSI report based on DMRS.

[0260] In the embodiments of this application, one uplink DCI can be used to indicate one downlink DMRS configuration information and one CSI report configuration information, thereby solving the problem of greater DCI overhead caused by the prior art (which requires two DCIs to indicate one DMRS configuration information and one CSI report configuration information) and reducing DCI overhead.

[0261] S412, the terminal determines the CSI report configuration and the DMRS configuration associated with the CSI report.

[0262] Optionally, the CSI report configuration may include at least one of the following: frequency domain configuration of CSI report, CSI report content, and CSI report submission configuration.

[0263] In this embodiment of the application, the terminal can determine the CSI report configuration and the DMRS configuration associated with the CSI report based on the uplink DCI instruction.

[0264] In some implementations, the uplink DCI includes a field that instructs the terminal to obtain a CSI report based on the DMRS. If the field instructs the terminal to obtain a CSI report based on the DMRS, then the field further indicates configuration information associated with the CSI report pre-configured by a higher-layer network signaling. The configuration information associated with the CSI report includes or is associated with the configuration information of the DMRS associated with the CSI report. Optionally, the configuration information of the DMRS includes at least one of the following: DMRS sequence configuration, DMRS time-domain location configuration, DMRS frequency-domain location configuration, DMRS port configuration, DMRS power-related parameters, and DMRS pattern configuration on an RB.

[0265] For example, the field is a CSI request field. When the field is all 0, it means that the uplink DCI is not associated with a CSI report. When the field is a specific codepoint, it corresponds to a pre-configured CSI report configuration. The CSI report configuration is associated with a DMRS configuration. The terminal determines a CSI report based on the DMRS configuration and the CSI report configuration, and determines an uplink channel resource to carry the CSI report, and further feeds back the CSI report to the network device.

[0266] In some other implementations, the uplink DCI has two fields: the first field indicates a DMRS configuration and the second field indicates a CSI report configuration. If the field indicating the DMRS configuration is not all zero bits, the terminal obtains a CSI report based on the DMRS, and the report configuration associated with the CSI report is determined based on the CSI report configuration indicated by the second field.

[0267] The above implementation method allows a single uplink DCI to indicate both the configuration information of the DMRS and the configuration information of a CSI report associated with the DMRS. This avoids using two separate DCIs to indicate the configuration information of the DMRS and the CSI report, thus saving DCI overhead.

[0268] S414, the terminal determines the frequency domain configuration associated with the CSI report.

[0269] Optionally, the frequency domain configuration associated with the CSI report may include at least one of the following: a) the frequency domain granularity associated with the CSI report; b) the number of frequency domain subbands associated with the CSI report; c) the size of the frequency domain subbands associated with the CSI report; d) the location of the frequency domain subbands associated with the CSI report.

[0270] In one implementation, the terminal can determine the frequency domain configuration associated with the CSI report based on the CSI report configuration indicated by the uplink DCI. This can be understood as the frequency domain configuration associated with the CSI report being associated with or included in the configuration information pre-configured by the network higher-layer signaling.

[0271] S416, the terminal obtains the CSI report.

[0272] In this step, the terminal can determine the DMRS timing associated with the CSI report based on the DMRS configuration information, obtain the DMRS channel based on the determined DMRS timing, and then obtain the CSI report.

[0273] In some implementations, optionally, before the terminal feeds back the CSI report, the terminal also needs to determine the report content associated with the CSI report. The CSI report is then obtained based on the report content associated with the CSI report. The report content associated with the CSI report includes at least one of the following: a) channel, i.e., H; b) channel correlation matrix, i.e., H'*H, where H' represents the conjugate transpose of H; c) PMI; d) CQI; e) RI; f) signal-to-noise ratio / signal-to-interference-plus-noise ratio.

[0274] In some implementations, the terminal determines the report content associated with the CSI report based on the CSI report configuration indicated by the uplink DCI. This can be understood as the CSI report associated configuration information pre-configured by the network higher-layer signaling being associated with or including the report content associated with the CSI report.

[0275] In some implementations, when the terminal determines that the content associated with the CSI report includes CQIs, each CQI carried in the CSI report can be a differential CQI value relative to a reference CQI value, which can be determined based on the MCS or code rate associated with the PDSCH indicated by the DCI. Alternatively, in another implementation, the terminal indicates to the network-side device whether each CQI carried in the CSI report is a differential CQI value relative to a reference CQI, or whether each CQI is an absolute CQI value.

[0276] Through the above implementation methods, feedback overhead can be reduced by feeding back a differential CQI value, or a more accurate CQI value can be fed back with limited feedback overhead, or the terminal can determine whether to feed back a more accurate CQI value (differential CQI value) or a CQI value within a larger CQI range (absolute CQI value) with limited feedback overhead.

[0277] In some implementations, when the terminal determines that the content associated with the CSI report includes a PMI, a channel, or a channel correlation matrix, the PMI, channel, or channel correlation matrix is ​​determined based on M basis vectors, where M is greater than or equal to 0. Furthermore, the value of M is determined based on the frequency domain configuration of the CSI report. This approach avoids situations where the value of M does not match the frequency domain configuration of the CSI report, improving the efficiency of the terminal in obtaining the CSI report or reducing the complexity of the terminal in obtaining the CSI report.

[0278] In some implementations, when the terminal determines that the content associated with the CSI report includes at least two of the following: PMI, channel, and channel correlation matrix, the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix based on the frequency domain configuration of the CSI report. This can also be understood as: the terminal determines that the content associated with the CSI report is one of PMI, channel, and channel correlation matrix, which is related to the frequency domain configuration of the CSI report. This approach maximizes the utilization of the limited feedback overhead of CSI report association, allowing for the feedback of more CSI information within a limited feedback overhead.

[0279] S418, the terminal determines the uplink channel resource associated with the CSI report and feeds back the CSI report to the network-side device through the associated uplink channel resource.

[0280] In some implementations, the terminal may determine the uplink channel resources associated with the CSI report based on the uplink DCI indication, for example, the uplink DCI indicating the uplink channel resources associated with the CSI report.

[0281] In some implementations, when the uplink channel resources need to carry multiple CSI reports (all CSI reports can be CSI reports based on DMRS measurements, some CSI reports can be CSI reports based on DMRS measurements, and some CSI reports can be CSI reports based on CSI-RS measurements), the terminal can also determine the priority of the multiple CSI reports, and map at least some of the CSI reports to the uplink channel resources based on the priority, and feed them back to the network-side equipment.

[0282] In one implementation, determining the priority of multiple CSI reports by the terminal may include: the terminal determining the priority of multiple CSI reports based on DMRS measurements; the terminal determining the priority of CSI reports based on the time-domain and frequency-domain locations of the DMRS associated with the CSI reports; when the frequency-domain locations are the same, the CSI report whose time-domain location is closer to the uplink channel resource has a higher priority; when the time-domain locations are the same, the CSI report whose frequency-domain location is closer to Point A has a higher priority.

[0283] In one implementation, determining the priority of multiple CSI reports by the terminal may include: the terminal determining the priority of multiple CSI reports based on DMRS measurements; the terminal determining the priority of CSI reports based on the time domain location of the DMRS associated with the CSI reports; and the CSI reports whose time domain location is closer to the uplink channel resources have higher priority.

[0284] In one implementation, determining the priority of multiple CSI reports may include: the terminal determining the priority of CSI reports based on DMRS measurements and CSI reports based on CSI-RS measurements, optionally, the priority of CSI reports based on DMRS measurements is lower than the priority of CSI reports based on CSI-RS measurements.

[0285] In some implementations, when the terminal maps at least a portion of the multiple CSI reports to uplink channel resources based on the priority and feeds them back to the network-side device, the terminal can determine which CSI reports are mapped to uplink channel resources and feed them back to the network. For example, when a CSI report based on DMRS measurement and a CSI report based on CSI-RS measurement are associated with the same PUCCH or PUSCH, the terminal only feeds back the CSI report based on CSI-RS measurement. As another example, when a CSI report based on DMRS measurement and a CSI report based on CSI-RS measurement are associated with the same carrier or BWP, the terminal only feeds back the CSI report based on CSI-RS measurement. This is equivalent to the CSI report based on CSI-RS measurement having a higher priority than the CSI report based on DMRS measurement. In this way, duplicate feedback of some CSI information can be avoided, preventing wasted feedback overhead.

[0286] Based on the same technical concept, this application also provides a method for obtaining CSI reports.

[0287] It should be noted that the following embodiments only describe the operation of the network-side device. For other matters not covered, please refer to the relevant descriptions of methods 200 to 400 above.

[0288] Figure 5 illustrates a flowchart of a method for obtaining a CSI report provided in an embodiment of this application. This method 500 can be executed by a network-side device. In other words, the method can be executed by software or hardware installed on the network-side device. As shown in Figure 5, the method mainly includes the following steps.

[0289] S510, the network-side device sends a DCI to the terminal, wherein the DCI instructs the terminal to obtain a CSI report based on DMRS.

[0290] The DCI is the same as the DCI received by the terminal in methods 200 to 400, and the relevant description can be found in the description of methods 200 to 400 above.

[0291] S512, the network-side device receives the CSI report fed back by the terminal based on DMRS on the uplink channel resources associated with the CSI report.

[0292] The terminal can send the CSI report to the network-side device according to the methods described in methods 200 to 400 above. For details, please refer to the descriptions in methods 200 to 400 above, which will not be repeated here.

[0293] In some implementations, the DCI may include a first field that indicates whether the terminal obtains a CSI report based on the DMRS. For example, the first field may be a 1-bit field used to indicate whether the terminal obtains a CSI report based on the DMRS indicated by the DCI. Alternatively, the first field may be a field greater than or equal to 1 bit, used to indicate whether the terminal obtains a CSI report based on the DMRS indicated by the DCI.

[0294] Optionally, the first field may also be used for at least one of the following:

[0295] Indicates the configuration information for the CSI report;

[0296] Indicates the configuration information of the DMRS associated with the PDSCH;

[0297] Indicates the configuration information of the DMRS used to measure CSI;

[0298] Indicates the PUCCH resource information associated with the CSI report;

[0299] Indicates the PUSCH resource information associated with the CSI report;

[0300] This indicates the configuration information for the confirmation information feedback time associated with PDSCH.

[0301] In some implementations, the DCI may further include a second field for indicating the configuration information associated with the CSI report. For example, the DCI includes two fields: a first field indicates a DMRS configuration, and a second field indicates a CSI report configuration. If the first field indicating the DMRS configuration is not all zero bits, the terminal obtains the CSI report based on the DMRS, and the report configuration associated with the CSI report is determined based on the CSI report configuration indicated by the second field.

[0302] In some implementations, before the network-side device receives the CSI report based on DMRS feedback from the terminal on the uplink channel resources associated with the CSI report, the method further includes at least one of the following:

[0303] 1) The network-side device instructs the frequency domain configuration associated with the CSI report via the first network signaling;

[0304] 2) The network-side device indicates a number of subbands via a second network signaling, wherein the number of subbands is associated with the frequency domain configuration associated with the CSI report.

[0305] Through the above implementation methods, the terminal can determine the frequency domain configuration associated with the CSI report based on the first network signaling or the second network signaling.

[0306] In some implementations, the method may further include: the network-side device receiving indication information sent by the terminal, wherein the indication information is used to indicate whether the value of each CQI carried in the CSI report is a relative value or an absolute value. This indication information may be sent along with the CSI report or sent separately. Through these implementations, the terminal can determine whether to provide a relative or absolute value of the CQI to be fed back based on the actual CQI that needs to be fed back, thereby saving feedback overhead.

[0307] In some implementations, before the network-side device receives the CSI report based on DMRS feedback from the terminal on the uplink channel resources associated with the CSI report, the method may further include at least one of the following:

[0308] 1) The network-side device determines that the acknowledgment information associated with the CSI report and PDSCH is associated with the same uplink channel resource, wherein the PDSCH is the PDSCH associated with the DCI; for example, the network-side device may determine the uplink channel resource associated with the acknowledgment information associated with the CSI report and PDSCH based on protocol conventions. Alternatively, the network-side device may also instruct the terminal via network signaling that the acknowledgment information associated with the CSI report and PDSCH is associated with the same uplink channel resource.

[0309] 2) The network-side device sends a third network signaling message to the terminal to determine that the uplink channel resource associated with the CSI report is the uplink channel resource indicated by the third network signaling message, wherein the third network signaling message includes MAC CE signaling or RRC signaling. Through this implementation, the network-side device can directly indicate the uplink channel resource associated with the CSI report, thereby improving configuration flexibility.

[0310] In some implementations, before the network-side device receives the CSI report based on DMRS feedback from the terminal on the uplink channel resources associated with the CSI report, the method further includes at least one of the following:

[0311] 1) The network-side device sends a fourth network signaling to the terminal, wherein the fourth network signaling is used to instruct all DMRS symbols associated with the first DMRS timing to obtain the CSI report, wherein the first DMRS timing is at least one of all DMRS timings;

[0312] Optionally, the fourth network signaling can indicate the DMRS symbol associated with the DMRS timing of the additional DMRS port used for CSI measurements for obtaining CSI reports.

[0313] 2) The network-side device sends a fifth network signaling message to the terminal, wherein the fifth network signaling message is used to instruct a portion of the RBs among all RBs associated with the DMRS to obtain the CSI report.

[0314] Optionally, the fifth network signaling can instruct the RB of the additional DMRS port used for CSI measurements to obtain CSI reports.

[0315] In some embodiments, the aforementioned uplink channel resources may be associated with multiple CSI reports and at least one transport block (TB). Optionally, if the multiple CSI reports include multiple CSI reports based on DMRS measurements, the network device determines that the highest priority CSI report based on DMRS measurements is simultaneously carried on the uplink channel resource along with the TB. Alternatively, if the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal (RS) measurements, the network device determines that the highest priority CSI report based on CSI-RS measurements is simultaneously carried on the uplink channel resource along with the TB.

[0316] It should be noted that the first to fifth network signaling messages mentioned above can be the same network signaling message, or they can be different network signaling messages, or some of them can be a single network signaling message. Specific embodiments in this application are not limited to these.

[0317] Optionally, the associations described in the embodiments of this application are not limited to one of the following interpretations:

[0318] A being associated with B means that A is B;

[0319] A being associated with B means that B can be obtained through A.

[0320] A being related to B means that B can be determined through A.

[0321] The channel state information (CSI) report feedback method provided in this application embodiment can be executed by a channel state information report feedback device, and the CSI report acquisition method provided in this application embodiment can be executed by a CSI report acquisition device. This application embodiment uses the channel state information report feedback device executing the channel state information report feedback method as an example, and the CSI report acquisition device executing the CSI report acquisition method as an example to illustrate the CSI report feedback device and CSI report acquisition device provided in this application embodiment.

[0322] This application provides a CSI report feedback device and a CSI report acquisition device. As an example, the CSI report feedback device and the CSI report acquisition device can be communication devices or components within communication devices, such as chips. The communication device can be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal can be, but is not limited to, the type of terminal 11 listed above, and the network-side device can be, but is not limited to, the type of network-side device 12 listed above. This application does not impose specific limitations.

[0323] The CSI report feedback device and CSI report acquisition device include a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, such as a Central Processing Unit (CPU), microprocessor, Digital Signal Processor (DSP), Artificial Intelligence (AI) processor, Graphics Processing Unit (GPU), Application Specific Integrated Circuit (ASIC), Network Processor (NP), Field Programmable Gate Array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceiver, pins, circuits, bus, radio frequency unit, etc.

[0324] Specifically, referring to Figure 6, when the CSI report feedback device is a terminal or a component within a terminal, the CSI report feedback device 600 includes a receiving module 601 for receiving DCI sent by a network-side device; a processing module 602 for determining, based on the DCI, that the terminal has obtained a CSI report based on DMRS, and obtaining the CSI report based on the measurement results obtained by measuring the DMRS associated with the CSI report; and a sending module 603 for feeding back the CSI report on the uplink channel resources associated with the CSI report.

[0325] In an optional implementation, the processing module 602 determines, based on the DCI, that the terminal has obtained a CSI report based on DMRS, including:

[0326] Based on the first field in the DCI, it is determined that the terminal obtains a CSI report based on DMRS, wherein the first field is used to indicate that a CSI report is obtained based on DMRS.

[0327] In one optional implementation, the first field has a length of 1 bit and is used to indicate that the terminal obtains a CSI report based on DMRS.

[0328] In one alternative implementation, the first field is further used for at least one of the following:

[0329] Indicates the configuration information associated with the CSI report;

[0330] Configuration information of the DMRS associated with the Physical Downlink Shared Channel (PDSCH);

[0331] Indicates the configuration information of the DMRS used to measure CSI;

[0332] The CSI report is associated with the uplink physical control channel (PUCCH) resource information.

[0333] The CSI report is associated with the uplink physical shared channel (PUSCH) resource information.

[0334] This indicates the configuration information for the confirmation information feedback time associated with PDSCH.

[0335] In an optional implementation, the DCI also includes a second field that indicates configuration information associated with the CSI report.

[0336] In an optional implementation, the processing module 602 is further configured to determine the frequency domain configuration associated with the CSI report.

[0337] In an optional implementation, the processing module 602 determines that the frequency domain configuration associated with the CSI report includes at least one of the following:

[0338] Based on the DMRS configuration information indicated by the DCI, determine the frequency domain configuration associated with the CSI report;

[0339] Based on the configuration information of the PDSCH indicated by the DCI, the frequency domain configuration associated with the CSI report is determined;

[0340] Based on the confirmation information feedback time configuration information of the DCI indication, determine the frequency domain configuration associated with the CSI report;

[0341] Based on the indication of the first network signaling, the frequency domain configuration associated with the CSI report is determined;

[0342] Based on the configuration information associated with the CSI report indicated by the DCI, determine the frequency domain configuration associated with the CSI report;

[0343] Based on the number of sub-bands agreed upon in the protocol, the frequency domain configuration associated with the CSI report is determined;

[0344] The frequency domain configuration associated with the CSI report is determined based on the number of subbands indicated by the second network signaling.

[0345] The frequency domain configuration associated with the CSI report is determined based on the number of sub-bands indicated by the DCI.

[0346] In one optional implementation, the frequency domain configuration associated with the CSI report includes at least one of the following:

[0347] The frequency domain granularity associated with the CSI report;

[0348] The number of frequency domain subbands associated with the CSI report;

[0349] The number of precoded resource block groups (PRGs) associated with the CSI report;

[0350] The frequency domain subband size associated with the CSI report;

[0351] The frequency domain sub-band location associated with the CSI report;

[0352] The location of the PRG associated with the CSI report.

[0353] In an optional implementation, the processing module 602 is further configured to determine the report content associated with the CSI report.

[0354] In an optional implementation, the processing module 602 determines that the report content associated with the CSI report includes at least one of the following:

[0355] Based on the DMRS configuration information indicated by the DCI, determine the report content associated with the CSI report;

[0356] The terminal determines the report content associated with the CSI report based on the confirmation information feedback time configuration information indicated by the DCI.

[0357] The content of the report associated with the CSI report is determined based on the frequency domain configuration associated with the CSI report.

[0358] In an optional implementation, the processing module 602 is further configured to perform at least one of the following:

[0359] Determine at least one CQI relative value, the at least one CQI relative value being determined based on the modulation and coding scheme MCS or code rate associated with the PDSCH, wherein the PDSCH is the PDSCH indicated by the DCI;

[0360] Determine at least one MCS index relative value, the at least one MCS index relative value being determined based on at least one of the MCS associated with the PDSCH, the MCS index, and the code rate, wherein the PDSCH is the PDSCH indicated by the DCI;

[0361] The PMI is determined based on M basis vectors, where M is an integer greater than or equal to 0, and the value of M is determined based on the frequency domain configuration associated with the CSI report.

[0362] In an optional implementation, the sending module 603 is further configured to indicate to the network-side device whether the value of each CQI carried in the CSI report is a relative or absolute value.

[0363] In an optional implementation, the processing module 602 is further configured to perform at least one of the following:

[0364] The uplink channel resource associated with the CSI report is determined to be the uplink channel resource associated with the acknowledgment information associated with the PDSCH, wherein the PDSCH is the PDSCH associated with the DCI;

[0365] The uplink channel resource associated with the CSI report is determined to be either an uplink channel resource indicated by third network signaling or an uplink channel resource pre-configured by third network signaling, wherein the third network signaling includes MAC CE signaling or RRC signaling.

[0366] In an optional implementation, the processing module 602 is further configured to perform at least one of the following:

[0367] When multiple CSI reports are associated with the uplink channel resources, and the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the priority of CSI reports based on DMRS measurements and CSI reports based on CSI-RS measurements is determined, wherein CSI reports based on CSI-RS measurements have priority over CSI reports based on DMRS measurements.

[0368] When multiple CSI reports are associated with the uplink channel resource, and the multiple CSI reports include multiple CSI reports based on DMRS measurements, the priority of each CSI report based on DMRS measurements is determined based on the time domain location of the DMRS associated with the CSI report, wherein the CSI report whose time domain location is closer to the uplink channel resource has a higher priority.

[0369] In the case where the multiple CSI reports include multiple CSI reports based on DMRS measurements associated with different serving cell identifiers, the priority of each CSI report based on the serving cell identifier of the DMRS associated with the CSI report is determined, wherein the CSI report with the smaller serving cell identifier has a higher priority.

[0370] In an alternative implementation, the processing module 602 is also used for at least one of the following:

[0371] In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block (TB), and the multiple CSI reports include multiple CSI reports based on DMRS measurements, the highest priority CSI report based on DMRS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB;

[0372] In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block (TB), and the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal (RS) measurements, the highest priority CSI report based on CSI-RS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB.

[0373] In an optional implementation, the processing module 602 is further configured to determine the time-domain or frequency-domain location of the DMRS associated with the CSI report.

[0374] In an optional implementation, the processing module 602 determines the time-domain or frequency-domain location of the DMRS associated with the CSI report, including at least one of the following:

[0375] Based on the fourth network signaling or protocol agreement, all DMRS symbols associated with the first DMRS timing are used to obtain the CSI report, wherein the first DMRS timing is at least one of all DMRS timings;

[0376] Based on the fifth network signaling or protocol agreement, it is determined that a portion of the resource blocks (RBs) in all resource blocks associated with the DMRS are used to obtain the CSI report.

[0377] Referring to Figure 7, when the CSI report acquisition device is a network-side device or a component of a network-side device, the CSI report acquisition 700 includes a sending module 701, used to send a DCI to the terminal, wherein the DCI instructs the terminal to acquire a CSI report based on DMRS; and a receiving module 702, used to receive the CSI report fed back by the terminal based on DMRS on the uplink channel resources associated with the CSI report.

[0378] In one optional implementation, the DCI includes a first field that instructs the terminal to obtain a CSI report based on DMRS.

[0379] In one alternative implementation, the first field is further used for at least one of the following:

[0380] Indicates the configuration information for the CSI report;

[0381] Configuration information of the DMRS associated with the Physical Downlink Shared Channel (PDSCH);

[0382] Indicates the configuration information of the DMRS used to measure CSI;

[0383] The CSI report is associated with the uplink physical control channel (PUCCH) resource information.

[0384] The CSI report is associated with the uplink physical shared channel (PUSCH) resource information.

[0385] This indicates the configuration information for the confirmation information feedback time associated with PDSCH.

[0386] In an optional implementation, the DCI also includes a second field for indicating configuration information associated with the CSI report.

[0387] In one optional implementation, the sending module is further configured to perform at least one of the following:

[0388] The frequency domain configuration associated with the CSI report is indicated via the first network signaling;

[0389] A subband number is indicated via a second network signaling, wherein the subband number is associated with the frequency domain configuration associated with the CSI report.

[0390] In an optional implementation, the receiving module 702 is further configured to receive indication information sent by the terminal, wherein the indication information is used to indicate whether the value of each CQI carried in the CSI report is a relative value or an absolute value.

[0391] In an alternative implementation, as shown in Figure 7, it further includes: a processing module 703, used for at least one of the following:

[0392] The CSI report is determined to be associated with the same uplink channel resource as the confirmation information associated with the PDSCH, wherein the PDSCH is the PDSCH associated with the DCI;

[0393] The uplink channel resource associated with the CSI report is determined to be the uplink channel resource indicated by the third network signaling sent to the terminal, wherein the third network signaling includes Media Access Control (MAC) Control Unit (CE) signaling or Radio Resource Control (RRC) signaling.

[0394] In one optional implementation, the sending module 701 is further configured to perform at least one of the following:

[0395] Send a fourth network signaling to the terminal, wherein the fourth network signaling is used to instruct all DMRS symbols associated with the first DMRS timing to obtain the CSI report, wherein the first DMRS timing is at least one of all DMRS timings;

[0396] A fifth network signaling is sent to the terminal, wherein the fifth network signaling is used to instruct a portion of the RBs among all RBs associated with the DMRS to obtain the CSI report.

[0397] In an alternative implementation, as shown in Figure 7, the processing module 703 is further comprising at least one of the following:

[0398] In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block, and the multiple CSI reports include multiple CSI reports based on DMRS measurements, the highest priority CSI report based on DMRS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB;

[0399] In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block, and the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the highest priority CSI report based on CSI-RS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB.

[0400] The apparatus provided in this application embodiment can implement the various processes implemented in the method embodiments of Figures 2 to 5 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0401] As shown in Figure 8, this application embodiment also provides a communication device 800, including a processor 801 and a memory 802. The memory 802 stores a program or instructions that can run on the processor 801. For example, when the communication device 800 is a terminal, the program or instructions executed by the processor 801 implement the various steps of the above-described CSI report feedback method embodiment and achieve the same technical effect. When the communication device 800 is a network-side device, the program or instructions executed by the processor 801 implement the various steps of the above-described CSI report acquisition method embodiment and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0402] This application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the method embodiment shown in FIG2. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and can achieve the same technical effect. The terminal can be the CSI report feedback device shown in FIG6. Specifically, FIG9 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0403] The terminal 900 includes, but is not limited to, at least some of the following components: radio frequency unit 901, network module 902, audio output unit 903, input unit 904, sensor 905, display unit 906, user input unit 907, interface unit 908, memory 909, and processor 910.

[0404] Those skilled in the art will understand that the terminal 900 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to the processor 910 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 9 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0405] It should be understood that, in this embodiment, the input unit 904 may include a graphics processor 9041 and a microphone 9042. The graphics processor 9041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 906 may include a display panel 9061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 907 includes at least one of a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0406] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 901 can transmit it to the processor 910 for processing; in addition, the radio frequency unit 901 can send uplink data to the network-side device. Typically, the radio frequency unit 901 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0407] The memory 909 can be used to store software programs or instructions, as well as various data. The memory 909 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 909 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 909 in the embodiments of this application includes, but is not limited to, these and any other suitable types of memory.

[0408] Processor 910 may include one or more processing units; optionally, processor 910 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 910.

[0409] Among them, the radio frequency unit 901 is used to receive DCI sent by the network side device;

[0410] Processor 910 is configured to determine, based on the DCI, that the terminal obtains a CSI report based on DMRS, and obtain the CSI report based on the measurement results obtained by measuring the DMRS associated with the CSI report;

[0411] The radio frequency unit 901 is also used to feed back the CSI report on the uplink channel resources associated with the CSI report.

[0412] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of method embodiment 200 and achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0413] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiment shown in FIG5. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and can achieve the same technical effect.

[0414] Specifically, this application embodiment also provides a network-side device, which can be the CSI report acquisition device shown in FIG7. As shown in FIG10, the network-side device 1000 includes: an antenna 1001, a radio frequency device 1002, a baseband device 1003, a processor 1004, and a memory 1005. The antenna 1001 is connected to the radio frequency device 1002. In the uplink direction, the radio frequency device 1002 receives information through the antenna 1001 and sends the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes the information to be transmitted and sends it to the radio frequency device 1002, which processes the received information and then transmits it through the antenna 1001.

[0415] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 1003, which includes a baseband processor.

[0416] The baseband device 1003 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG10. One of the chips is, for example, a baseband processor, which is connected to the memory 1005 via a bus interface to call the program in the memory 1005 and execute the network device operation shown in the above method embodiment.

[0417] The network-side device may also include a network interface 1006, such as a Common Public Radio Interface (CPRI).

[0418] Specifically, the network-side device 1000 in this application embodiment further includes: instructions or programs stored in memory 1005 and executable on processor 104. Processor 1004 calls the instructions or programs in memory 1005 to execute the methods executed by each module shown in FIG7 and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0419] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described CSI report feedback method embodiment or the various processes of the above-described CSI report acquisition method embodiment, and can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0420] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0421] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described CSI report feedback method embodiment, or to implement the various processes of the above-described CSI report acquisition method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0422] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0423] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described CSI report feedback method embodiment or the various processes of the above-described CSI report acquisition method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0424] This application also provides a wireless communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the CSI report feedback method as described above, and the network-side device can be used to perform the steps of the CSI report acquisition method as described above.

[0425] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0426] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0427] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

A feedback method for channel state information reporting, comprising: Based on the downlink control information (DCI) sent by the network-side equipment, the terminal determines that it has obtained the channel state information (CSI) report based on the demodulation reference signal (DMRS). The terminal obtains the CSI report based on the measurement results obtained by measuring the DMRS associated with the CSI report; The terminal feeds back the CSI report on the uplink channel resources associated with the CSI report. According to the method of claim 1, wherein, The terminal determines, based on the downlink control information (DCI) sent by the network-side equipment, the channel state information (CSI) report obtained by the terminal based on the demodulation reference signal (DMRS), including: The terminal determines, based on the first field in the DCI, that it obtains a CSI report based on DMRS, wherein the first field is used to indicate that the CSI report is obtained based on DMRS. The method according to claim 2, wherein, The first field has a length of 1 bit and is used to indicate that the terminal obtains a CSI report based on DMRS. The method according to claim 2, wherein, The first field is also used for at least one of the following: Indicates the configuration information associated with the CSI report; Configuration information of the DMRS associated with the Physical Downlink Shared Channel (PDSCH); Indicates the configuration information of the DMRS used to measure CSI; The CSI report is associated with the uplink physical control channel (PUCCH) resource information. The CSI report is associated with the uplink physical shared channel (PUSCH) resource information. This indicates the configuration information for the confirmation information feedback time associated with PDSCH. The method according to claim 2, wherein, The DCI also includes a second field, which is used to indicate the configuration information associated with the CSI report. The method according to any one of claims 1 to 4, wherein, Before the terminal feeds back the CSI report on the uplink channel resources associated with the CSI report, the method further includes: The terminal determines the frequency domain configuration associated with the CSI report according to at least one of the following: The terminal determines the frequency domain configuration associated with the CSI report based on the DMRS configuration information indicated by the DCI. The terminal determines the frequency domain configuration associated with the CSI report based on the PDSCH configuration information indicated by the DCI. The terminal determines the frequency domain configuration associated with the CSI report based on the confirmation information feedback time configuration information indicated by the DCI. The terminal determines the frequency domain configuration associated with the CSI report based on the instruction of the first network signaling. The terminal determines the frequency domain configuration associated with the CSI report based on the indication of the DCI indication; The terminal determines the frequency domain configuration associated with the CSI report based on the number of sub-bands agreed upon in the protocol. The terminal determines the frequency domain configuration associated with the CSI report based on the number of sub-bands indicated by the second network signaling. The terminal determines the frequency domain configuration associated with the CSI report based on the number of sub-bands indicated by the DCI. The method according to claim 6, wherein, The frequency domain configuration associated with the CSI report includes at least one of the following: The frequency domain granularity associated with the CSI report; The number of frequency domain subbands associated with the CSI report; The number of precoded resource block groups (PRGs) associated with the CSI report; The frequency domain subband size associated with the CSI report; The frequency domain sub-band location associated with the CSI report; The location of the PRG associated with the CSI report. The method according to any one of claims 1 to 7, wherein, Before the terminal feeds back the CSI report on the uplink channel resources associated with the CSI report, the method further includes: The terminal determines the report content associated with the CSI report according to at least one of the following: The terminal determines the report content associated with the CSI report based on the DMRS configuration information indicated by the DCI. The terminal determines the report content associated with the CSI report based on the confirmation information feedback time configuration information indicated by the DCI. The terminal determines the report content associated with the CSI report based on the number of subbands indicated by the protocol or network signaling. The terminal determines the report content associated with the CSI report based on the frequency domain configuration associated with the CSI report. The method according to claim 8, wherein, The method further includes at least one of the following: The terminal determines at least one CQI relative value, which is determined based on the modulation and coding scheme MCS or code rate associated with the PDSCH, wherein the PDSCH is the PDSCH indicated by the DCI. The terminal determines at least one modulation and coding scheme (MCS) index relative value, which is determined based on at least one of the following associated with the PDSCH: MCS, MCS index, and code rate, wherein the PDSCH is the PDSCH indicated by the DCI. The terminal indicates to the network-side device whether the value of each CQI carried in the CSI report is a relative value or an absolute value; The terminal determines the PMI based on M basis vectors, where M is an integer greater than or equal to 0, and the value of M is determined based on the frequency domain configuration associated with the CSI report. The method according to any one of claims 1 to 9, wherein, Before the terminal feeds back the CSI report on the uplink channel resources associated with the CSI report, the method further includes at least one of the following: The terminal determines that the uplink channel resource associated with the CSI report is the uplink channel resource associated with the acknowledgment information associated with the PDSCH, wherein the PDSCH is the PDSCH associated with the DCI. The terminal determines that the uplink channel resource associated with the CSI report is an uplink channel resource indicated by third network signaling or an uplink channel resource pre-configured by third network signaling, wherein the third network signaling includes Media Access Control (MAC) Control Unit (CE) signaling or Radio Resource Control (RRC) signaling. The method according to any one of claims 1 to 10, wherein, When multiple CSI reports need to be carried in the uplink channel resources, the method further includes at least one of the following: When the plurality of CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the terminal determines the priority of CSI reports based on DMRS measurements and CSI reports based on CSI-RS measurements, wherein CSI reports based on CSI-RS measurements have priority over CSI reports based on DMRS measurements. When the multiple CSI reports include multiple CSI reports based on DMRS measurements, the terminal determines the priority of each CSI report based on the time domain location of the DMRS associated with the CSI report, wherein the CSI report whose time domain location is closer to the uplink channel resource has a higher priority. When the multiple CSI reports include multiple CSI reports based on DMRS measurements associated with different serving cell identifiers, the terminal determines the priority of each CSI report based on the serving cell identifier of the DMRS associated with the CSI report, wherein the CSI report with the smaller serving cell identifier has a higher priority. The method according to any one of claims 1 to 11, wherein, When the uplink channel resources are associated with multiple CSI reports and at least one transport block (TB), the method further includes at least one of the following: When the multiple CSI reports include multiple CSI reports based on DMRS measurements, the terminal determines that the highest priority CSI report based on DMRS measurements is simultaneously carried on the uplink channel resource along with the TB; When the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the terminal determines the highest priority CSI report based on CSI-RS measurements to be simultaneously carried on the uplink channel resource along with the TB. The method according to any one of claims 1 to 12, wherein, Before the terminal obtains the CSI report based on the measurement results obtained from the measurement of the DMRS associated with the CSI report, the method further includes: The terminal determines the time-domain or frequency-domain location of the DMRS associated with the CSI report according to at least one of the following: The terminal determines, based on the fourth network signaling or protocol agreement, that all DMRS symbols associated with the target DMRS timing are used to obtain the CSI report, wherein the target DMRS timing is at least one of all DMRS timings; The terminal determines, based on the fifth network signaling or protocol agreement, that a portion of the resource blocks (RBs) associated with the DMRS are used to obtain the CSI report. A method for obtaining a CSI report includes: The network-side device sends a DCI to the terminal, wherein the DCI instructs the terminal to obtain a CSI report based on DMRS; The network-side device receives the CSI report from the terminal based on DMRS feedback on the uplink channel resources associated with the CSI report. The method according to claim 14, wherein, The DCI includes a first field, through which the terminal is instructed to obtain a CSI report based on DMRS. The method according to claim 15, wherein, The first field is also used for at least one of the following: Indicates the configuration information for the CSI report; Configuration information of the DMRS associated with the Physical Downlink Shared Channel (PDSCH); Indicates the configuration information of the DMRS used to measure CSI; The CSI report is associated with the uplink physical control channel (PUCCH) resource information. The CSI report is associated with the uplink physical shared channel (PUSCH) resource information. This indicates the configuration information for the confirmation information feedback time associated with PDSCH. The method according to claim 15, wherein, The DCI also includes a second field for indicating configuration information associated with the CSI report. The method according to any one of claims 14 to 17, wherein, Before the network-side device receives the CSI report based on DMRS feedback from the terminal on the uplink channel resources associated with the CSI report, the method further includes at least one of the following: The network-side device instructs the frequency domain configuration associated with the CSI report via a first network signaling; The network-side device indicates a sub-band quantity via a second network signaling, wherein the sub-band quantity is associated with the frequency domain configuration associated with the CSI report. The method according to any one of claims 14 to 18, wherein, The method further includes: The network-side device receives indication information sent by the terminal, wherein the indication information is used to indicate whether the value of each CQI carried in the CSI report is a relative value or an absolute value. The method according to any one of claims 14 to 19, wherein, Before the network-side device receives the CSI report based on DMRS feedback from the terminal on the uplink channel resources associated with the CSI report, the method further includes at least one of the following: The network-side device determines that the acknowledgment information associated with the CSI report and the PDSCH is associated with the same uplink channel resource, wherein the PDSCH is the PDSCH associated with the DCI; The network-side device sends a third network signaling message to the terminal to determine that the uplink channel resource associated with the CSI report is the uplink channel resource indicated by the third network signaling message. The third network signaling message includes Media Access Control (MAC) Control Unit (CE) signaling message or Radio Resource Control (RRC) signaling message. The method according to any one of claims 14 to 20, wherein, Before the network-side device receives the CSI report based on DMRS feedback from the terminal on the uplink channel resources associated with the CSI report, the method further includes at least one of the following: The network-side device sends a fourth network signaling to the terminal, wherein the fourth network signaling is used to instruct all DMRS symbols associated with the first DMRS timing to obtain the CSI report, wherein the first DMRS timing is at least one of all DMRS timings; The network-side device sends a fifth network signaling message to the terminal, wherein the fifth network signaling message is used to instruct a portion of the resource blocks (RBs) associated with the DMRS to obtain the CSI report. The method according to any one of claims 14 to 21, wherein, When the uplink channel resources are associated with multiple CSI reports and at least one transport block (TB), the method further includes at least one of the following: When the multiple CSI reports include multiple CSI reports based on DMRS measurements, the network device determines that the highest priority CSI report based on DMRS measurements is simultaneously carried on the uplink channel resource along with the TB; When the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the network device determines that the highest priority CSI report based on CSI-RS measurements is simultaneously carried on the uplink channel resource along with the TB. A feedback device for channel state information reporting, comprising: The receiving module is used to receive DCI sent by network-side devices; The processing module is used to determine the terminal's CSI report based on the DMRS based on the DCI, and to obtain the CSI report based on the measurement results obtained by measuring the DMRS associated with the CSI report; A sending module is used to feed back the CSI report on the uplink channel resources associated with the CSI report. The apparatus according to claim 23, wherein, The processing module determines, based on the DCI, that the terminal obtains the CSI report based on DMRS, including: Based on the first field in the DCI, it is determined that the terminal obtains a CSI report based on DMRS, wherein the first field is used to indicate that a CSI report is obtained based on DMRS. The apparatus according to claim 23 or 24, wherein, The processing module is also configured to determine the frequency domain configuration associated with the CSI report according to at least one of the following: Based on the DMRS configuration information indicated by the DCI, determine the frequency domain configuration associated with the CSI report; Based on the configuration information of the PDSCH indicated by the DCI, the frequency domain configuration associated with the CSI report is determined; Based on the confirmation information feedback time configuration information of the DCI indication, determine the frequency domain configuration associated with the CSI report; Based on the indication of the first network signaling, the frequency domain configuration associated with the CSI report is determined; Based on the configuration information associated with the CSI report indicated by the DCI, determine the frequency domain configuration associated with the CSI report; Based on the number of sub-bands agreed upon in the protocol, the frequency domain configuration associated with the CSI report is determined; The frequency domain configuration associated with the CSI report is determined based on the number of subbands indicated by the second network signaling. The frequency domain configuration associated with the CSI report is determined based on the number of sub-bands indicated by the DCI. The apparatus according to any one of claims 23 to 25, wherein, The processing module is also configured to determine the report content associated with the CSI report according to at least one of the following: Based on the DMRS configuration information indicated by the DCI, determine the report content associated with the CSI report; The terminal determines the report content associated with the CSI report based on the confirmation information feedback time configuration information indicated by the DCI. The content of the report associated with the CSI report is determined based on the frequency domain configuration associated with the CSI report. The apparatus according to claim 26, wherein, The processing module is also used for at least one of the following: Determine at least one CQI relative value, the at least one CQI relative value being determined based on the modulation and coding scheme MCS or code rate associated with the PDSCH, wherein the PDSCH is the PDSCH indicated by the DCI; Determine at least one MCS relative value, the at least one MCS relative value being determined based on the modulation and coding scheme MCS or code rate associated with the PDSCH, wherein the PDSCH is the PDSCH indicated by the DCI; The PMI is determined based on M basis vectors, where M is an integer greater than or equal to 0, and the value of M is determined based on the frequency domain configuration associated with the CSI report. The apparatus according to claim 26 or 27, wherein, The sending module is also used to indicate to the network-side device whether the value of each CQI carried in the CSI report is a relative value or an absolute value. The apparatus according to any one of claims 23 to 28, wherein, The processing module is also used for at least one of the following: The uplink channel resource associated with the CSI report is determined to be the uplink channel resource associated with the acknowledgment information associated with the PDSCH, wherein the PDSCH is the PDSCH associated with the DCI; The uplink channel resource associated with the CSI report is determined to be either an uplink channel resource indicated by third network signaling or an uplink channel resource pre-configured by third network signaling, wherein the third network signaling includes MAC CE signaling or RRC signaling. The apparatus according to any one of claims 23 to 29, wherein, The processing module is also used for at least one of the following: When multiple CSI reports are associated with the uplink channel resources, and the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the priority of CSI reports based on DMRS measurements and CSI reports based on CSI-RS measurements is determined, wherein CSI reports based on CSI-RS measurements have priority over CSI reports based on DMRS measurements. When multiple CSI reports are associated with the uplink channel resource, and the multiple CSI reports include multiple CSI reports based on DMRS measurements, the priority of each CSI report based on DMRS measurements is determined based on the time domain location of the DMRS associated with the CSI report, wherein the CSI report whose time domain location is closer to the uplink channel resource has a higher priority. In the case where the multiple CSI reports include multiple CSI reports based on DMRS measurements associated with different serving cell identifiers, the priority of each CSI report based on the serving cell identifier of the DMRS associated with the CSI report is determined, wherein the CSI report with the smaller serving cell identifier has a higher priority. The apparatus according to any one of claims 23 to 30, wherein, The processing module is also used for at least one of the following: In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block (TB), and the multiple CSI reports include multiple CSI reports based on DMRS measurements, the highest priority CSI report based on DMRS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB; In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block (TB), and the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal (RS) measurements, the highest priority CSI report based on CSI-RS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB. The apparatus according to any one of claims 23 to 31, wherein, The processing module is also configured to determine the time-domain or frequency-domain location of the DMRS associated with the CSI report according to at least one of the following: Based on the fourth network signaling or protocol agreement, all DMRS symbols associated with the first DMRS timing are used to obtain the CSI report, wherein the first DMRS timing is at least one of all DMRS timings; Based on the fifth network signaling or protocol agreement, it is determined that a portion of the resource blocks (RBs) in all resource blocks associated with the DMRS are used to obtain the CSI report. A CSI report acquisition device, comprising: A sending module is used to send a DCI to a terminal, wherein the DCI instructs the terminal to obtain a CSI report based on DMRS; The receiving module is configured to receive the CSI report fed back by the terminal based on DMRS on the uplink channel resources associated with the CSI report. The apparatus according to claim 33, wherein, The sending module is also used for at least one of the following: The frequency domain configuration associated with the CSI report is indicated via the first network signaling; A subband number is indicated via a second network signaling, wherein the subband number is associated with the frequency domain configuration associated with the CSI report. The apparatus according to claim 33 or 34, wherein, The receiving module is further configured to receive indication information sent by the terminal, wherein the indication information is used to indicate whether the value of each CQI carried in the CSI report is a relative value or an absolute value. The apparatus according to any one of claims 33 to 35, wherein, Also includes: The processing module is used for at least one of the following: The acknowledgment information associated with the CSI report and the PDSCH is determined to be associated with the same uplink channel resource, wherein the PDSCH is the PDSCH associated with the DCI; The uplink channel resource associated with the CSI report is determined to be the uplink channel resource indicated by the third network signaling sent to the terminal, wherein the third network signaling includes Media Access Control (MAC) Control Unit (CE) signaling or Radio Resource Control (RRC) signaling. The apparatus according to any one of claims 33 to 36, wherein, The sending module is also used for at least one of the following: Send a fourth network signaling to the terminal, wherein the fourth network signaling is used to instruct all DMRS symbols associated with the first DMRS timing to obtain the CSI report, wherein the first DMRS timing is at least one of all DMRS timings; A fifth network signaling is sent to the terminal, wherein the fifth network signaling is used to instruct a portion of the RBs among all RBs associated with the DMRS to obtain the CSI report. The apparatus according to any one of claims 33 to 37, wherein, Also includes: The processing module is also used for at least one of the following: In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block, and the multiple CSI reports include multiple CSI reports based on DMRS measurements, the highest priority CSI report based on DMRS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB; In the case where the uplink channel resource is associated with multiple CSI reports and at least one transport block, and the multiple CSI reports include CSI reports based on DMRS measurements and CSI reports based on CSI reference signal RS measurements, the highest priority CSI report based on CSI-RS measurements is determined to be simultaneously carried on the uplink channel resource along with the TB. A terminal includes a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the feedback method for reporting channel state information as claimed in any one of claims 1 to 13. A network-side device includes a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the CSI report acquisition method as described in any one of claims 14 to 22. A readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of a feedback method for channel state information reporting as claimed in any one of claims 1 to 13, or the steps of a method for obtaining a CSI report as claimed in any one of claims 14 to 22.

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