Method and apparatus for transmitting and receiving channel state information based on multiple antennas in communication system

Abstract

This method of a terminal comprises the steps of: receiving channel state information (CSI) configuration information from a base station; receiving, from the base station, downlink control information (DCI) triggering a CSI report; determining the location of a CSI-RS resource set on the basis of a triggering offset included in the CSI configuration information; determining the location of a CSI-interference measurement (IM) resource set on the basis of the same triggering offset as the CSI-RS resource set; generating CSI on the basis of a first measurement result in a CSI-RS resource belonging to the CSI-RS resource set and a second measurement result in a CSI-IM resource belonging to the CSI-IM resource set; and transmitting the CSI report including the CSI to the base station.

Description

Method and apparatus for transmitting and receiving channel state information based on multiple antennas in a communication system

[0001] The present disclosure relates to communication technology, and more specifically, to a multi-antenna-based transmission and reception technology for channel state information (CSI).

[0002] Along with the advancement of information and communication technology, various wireless communication technologies are being developed. Representative wireless communication technologies include LTE (long term evolution) and NR (new radio), which are defined in the 3GPP (3rd generation partnership project) standards. LTE can be one of the wireless communication technologies among 4G (4th Generation) wireless communication technologies, and NR can be one of the wireless communication technologies among 5G (5th Generation) wireless communication technologies.

[0003] In order to process the rapidly increasing wireless data following the commercialization of 4G communication systems (e.g., communication systems supporting LTE), 5G communication systems (e.g., communication systems supporting NR) that use frequency bands higher than those of 4G communication systems (e.g., frequency bands below 6 GHz) are being considered. 5G communication systems can support eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication).

[0004] Discussions are underway regarding the 6G communication system following the 5G communication system. Based on the technological advancements discussed in the 5G communication system, the 6G communication system is expected to support AI-based intelligent communication (e.g., AI-Native), the combination of communication and sensing (e.g., ISAC (Integrated Sensing and Communication)), and hyperspace connectivity including satellite communication.

[0005] Meanwhile, the communication system can support up to 128 CSI-RS (channel state information-reference signal) ports, and in this case, the size of the channel state information may increase. If the existing CSI reporting method is applied as is, a problem may arise where the uplink resource transmission efficiency is significantly degraded. Furthermore, since the periodic CSI-RS transmission method supports offsets only at the resource set level, it has limitations in that it cannot meet the demand for flexible scheduling where individual resources within a resource set must be placed in different slots. Methods to solve the aforementioned problems are necessary.

[0006] The purpose of the present disclosure to solve the above-mentioned problems is to provide a method and apparatus for transmitting and receiving channel state information based on multiple antennas in a communication system.

[0007] A method of a terminal according to embodiments of the present disclosure for achieving the above objective comprises: receiving channel state information (CSI) setting information from a base station; receiving downlink control information (DCI) from the base station that triggers a CSI report; determining the location of a resource set of CSI-RS based on a triggering offset included in the CSI setting information; determining the location of an interference measurement (CSI-IM) resource set based on the same triggering offset as the CSI-RS resource set; generating a CSI based on a first measurement result in a CSI-RS resource belonging to the CSI-RS resource set and a second measurement result in a CSI-IM resource belonging to the CSI-IM resource set; and transmitting the CSI report containing the CSI to the base station.

[0008] Based on the fact that the above CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the location of the above CSI-IM resource set can be determined based on the triggering offset set for the above CSI-RS resource set, and a separate triggering offset for the above CSI-IM resource set may not be set in the terminal.

[0009] Based on the fact that the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the CSI-RS resource set may be configured to include a plurality of CSI-RS resource groups, and each of the plurality of CSI-RS resource groups may be configured to include one or more CSI-RS resources, and information indicating the number of the plurality of CSI-RS resource groups may be included in the CSI setting information.

[0010] Based on the fact that the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the second measurement result from the above CSI-IM resource may be included in the above CSI report.

[0011] At least one CSI-RS resource belonging to the above CSI-RS resource set and at least one CSI-IM resource belonging to the above CSI-IM resource set may be located within the same slot.

[0012] The above triggering offset may be a slot offset between the slot where the DCI is received and the slot where the CSI-RS resource set is located.

[0013] The location of at least one CSI-RS resource belonging to the above CSI-RS resource set can be determined based on the triggering offset and additional offset, and the information of the additional offset can be included in the CSI setting information.

[0014] In the present disclosure, where an additional offset is defined in slot units, the additional offset may be interpreted as an additional slot offset depending on the context. Depending on the context, the additional slot offset may be interpreted as an additional offset set to a higher time unit than the slot (e.g., a frame).

[0015] At least one of the QCL (quasi co-location) information, power control offset, or SSB (synchronization signal block) reference power control offset can be configured to be commonly applied to all CSI-RS resources belonging to the set of CSI-RS resources.

[0016] A method of a base station according to embodiments of the present disclosure for achieving the above objective comprises: transmitting CSI configuration information to a terminal, the information of a CSI (channel state information)-RS (reference signal) resource set, the information of a CSI-IM (interference measurement) resource set, a triggering offset, and codebook information; transmitting downlink control information (DCI) that triggers a CSI report to the terminal; transmitting a CSI-RS from one or more CSI-RS resources belonging to the CSI-RS resource set to the terminal at a location based on the triggering offset; and receiving the CSI report from the terminal, the CSI including a CSI generated based on a first measurement result in the one or more CSI-RS resources and a second measurement result in a CSI-IM resource belonging to the CSI-IM resource set, wherein the location of the CSI-IM resource set is set based on the same triggering offset as the CSI-RS resource set.

[0017] Based on the fact that the above CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information is set as a Type-II Doppler codebook, the location of the above CSI-IM resource set may be set based on the triggering offset set for the above CSI-RS resource set, and a separate triggering offset for the above CSI-IM resource set may not be set on the terminal.

[0018] Based on the fact that the above codebook information is set as a Type-II Doppler codebook, the above CSI-RS resource set may be configured to include a plurality of CSI-RS resource groups, and each of the plurality of CSI-RS resource groups may be configured to include one or more CSI-RS resources, and information indicating the number of the plurality of CSI-RS resource groups may be included in the above CSI setting information.

[0019] Based on the fact that the above codebook information is set to a Type-II Doppler codebook, the second measurement result in the above CSI-IM resource may be included in the above CSI report.

[0020] At least one CSI-RS resource belonging to the above CSI-RS resource set and at least one CSI-IM resource belonging to the above CSI-IM resource set may be located within the same slot.

[0021] The above triggering offset may be a slot offset between the slot where the DCI is transmitted and the slot where the CSI-RS resource set is located.

[0022] The location of at least one CSI-RS resource belonging to the above CSI-RS resource set can be determined based on the triggering offset and additional offset, and the information of the additional offset can be included in the CSI setting information.

[0023] At least one of the QCL (quasi co-location) information, power control offset, or SSB (synchronization signal block) reference power control offset can be configured to be commonly applied to all CSI-RS resources belonging to the set of CSI-RS resources.

[0024] A terminal according to embodiments of the present disclosure for achieving the above objective comprises at least one processor, wherein the at least one processor may cause the terminal to receive channel state information (CSI) setting information from a base station; receive downlink control information (DCI) from the base station that triggers a CSI report; determine the location of a resource set of CSI-RS based on a triggering offset included in the CSI setting information; determine the location of an interference measurement (CSI-IM) resource set based on the same triggering offset as the resource set of CSI-RS; generate a CSI based on a first measurement result in a CSI-RS resource belonging to the resource set of CSI-RS and a second measurement result in a CSI-IM resource belonging to the resource set of CSI-IM; and cause the CSI report including the CSI to be transmitted to the base station.

[0025] Based on the fact that the above CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the location of the above CSI-IM resource set can be determined based on the triggering offset set for the above CSI-RS resource set, and a separate triggering offset for the above CSI-IM resource set may not be set in the terminal.

[0026] Based on the fact that the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the CSI-RS resource set may be configured to include a plurality of CSI-RS resource groups, and each of the plurality of CSI-RS resource groups may be configured to include one or more CSI-RS resources, and information indicating the number of the plurality of CSI-RS resource groups may be included in the CSI setting information.

[0027] At least one of the QCL (quasi co-location) information, power control offset, or SSB (synchronization signal block) reference power control offset can be configured to be commonly applied to all CSI-RS resources belonging to the set of CSI-RS resources.

[0028] According to the present disclosure, the data transmission rate of a system can be improved by providing a method and apparatus for efficiently acquiring channel state information (CSI) in a multi-antenna system. Additional resource-level slot offsets for individual resources within a resource set can be introduced, and the resource operation efficiency of a base station can be maximized by flexibly arranging non-periodic CSI-RS resources in different slots. A terminal can optimize the transmission efficiency of uplink control information (UCI) by flexibly selecting a single-part or dual-part reporting method depending on the number of CSI reports or network configuration. The base station and the terminal can effectively mitigate the complexity of receiver implementation in the terminal during multiple-input multiple-output (MIMO) transmission by applying sounding reference signal (SRS) port grouping and one-to-one mapping techniques between codewords. By applying the same triggering offset to the CSI-RS resource set and the CSI-IM (interference measurement) resource set, the complexity of resource configuration during non-periodic CSI reporting configuration can be reduced, and the timing consistency of CSI measurement and reporting can be improved. In addition, the terminal can perform precise channel measurements and improve communication quality by applying the same transmission power ratio (e.g., EPRE (Energy Per Resource Element) ratio) assumption to multiple resource groups aggregated to support up to 128 CSI-RS ports.

[0029] FIG. 1 is a conceptual diagram illustrating embodiments of a communication system.

[0030] FIG. 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0031] Figure 3 is a flowchart illustrating the method of CSI measurement and reporting.

[0032] FIG. 4 is a conceptual diagram illustrating an example of a non-periodic channel measurement resource timeline and a non-periodic interference measurement resource timeline.

[0033] FIG. 5 is a conceptual diagram illustrating an example of a non-periodic channel measurement resource timeline and a non-periodic interference measurement resource timeline when a Doppler codebook is set.

[0034] FIG. 6 is a conceptual diagram illustrating an example of a non-periodic channel measurement resource timeline and a non-periodic interference measurement resource timeline when a Doppler codebook is set.

[0035] The present disclosure is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present disclosure.

[0036] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0037] In embodiments of the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B". Additionally, in embodiments of the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B".

[0038] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0039] The terms used in this disclosure are used merely to describe specific embodiments and are not intended to limit this disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0040] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which this disclosure pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this disclosure.

[0041] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding of the present disclosure, the same reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted.

[0042] A communication system to which embodiments according to the present disclosure are applied will be described. The communication system to which embodiments according to the present disclosure are applied is not limited to the details described below, and embodiments according to the present disclosure may be applied to various communication systems. Here, the term "communication system" may be used interchangeably with "communication network."

[0043] In the embodiments, "setting an operation (e.g., a transmission operation)" may mean that "setting information for the operation (e.g., information, information element, parameter)" and / or "information directing the execution of the operation" is signaled. "Setting information (e.g., information element, parameter)" may mean that the information is signaled. The signaling may be at least one of SI (system information) signaling (e.g., transmission of a SIB (system information block) and / or MIB (master information block)), RRC signaling (e.g., transmission of an RRC message, RRC parameter, and / or upper layer parameter), MAC signaling (e.g., transmission of a MAC message and / or MAC CE (control element)), or PHY signaling (e.g., transmission of a PHY message, DCI (downlink control information), UCI (uplink control information), and / or SCI (sidelink control information).

[0044] A message for SI signaling may be referred to as an SI message, a message for RRC signaling may be referred to as an RRC message, a message for MAC CE signaling may be referred to as a MAC message, and a message for PHY signaling may be referred to as a PHY message. The aforementioned messages may be expressed as a first message, a second message, a third message, etc.

[0045] In the present disclosure, a phrase containing "~ case (e.g., when ~)" may be expressed as a phrase containing "~ based on (e.g., based on ~)" or a phrase containing "~ in response to (e.g., in response to ~)". In other words, a phrase containing "~ case" may be interpreted as identical or similar to a phrase containing "~ based on" or a phrase containing "~ in response to".

[0046] In the present disclosure, "time" may mean a time point, and "time point" may mean time. Time and time point may be used interchangeably. The reception time of a signal or channel may mean a reception start time or a reception end time. The transmission time of a signal or channel may mean a transmission start time or a transmission end time.

[0047] FIG. 1 is a conceptual diagram illustrating embodiments of a communication system.

[0048] Referring to FIG. 1, the communication system (100) may include a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Additionally, the communication system (100) may further include a core network (e.g., an S-GW (serving-gateway), a P-GW (PDN (packet data network)-gateway), and an MME (mobility management entity)). If the communication system (100) is a 5G communication system (e.g., a new radio (NR) system), the core network may include an AMF (access and mobility management function), a UPF (user plane function), an SMF (session management function), etc.

[0049] Multiple communication nodes (110 to 130) can support communication protocols defined in 3GPP (3rd generation partnership project) standards (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). Multiple communication nodes (110 to 130) can support CDMA (code division multiple access) technology, WCDMA (wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (non-orthogonal multiple access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (space division multiple access) technology, etc. Each of the multiple communication nodes may have the following structure.

[0050] FIG. 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0051] Referring to FIG. 2, the communication node (200) may include at least one processor (210), a memory (220), and a transceiver (230) that is connected to a network to perform communication. Additionally, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) to communicate with one another.

[0052] However, each component included in the communication node (200) may be connected via individual interfaces or individual buses centered around the processor (210), rather than via a common bus (270). For example, the processor (210) may be connected via a dedicated interface to at least one of a memory (220), a transmission / reception device (230), an input interface device (240), an output interface device (250), and a storage device (260).

[0053] The processor (210) can execute a program command stored in at least one of the memory (220) and the storage device (260). The processor (210) may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods according to embodiments of the present disclosure are performed. Each of the memory (220) and the storage device (260) may be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be composed of at least one of read-only memory (ROM) and random access memory (RAM).

[0054] Referring again to FIG. 1, the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) may form a macro cell. Each of the fourth base station (120-1) and the fifth base station (120-2) may form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) may be located within the cell coverage of the first base station (110-1). The second terminal (130-2), the fourth terminal (130-4), and the fifth terminal (130-5) may be located within the cell coverage of the second base station (110-2). The fifth base station (120-2), the fourth terminal (130-4), the fifth terminal (130-5), and the sixth terminal (130-6) may be located within the cell coverage of the third base station (110-3). The first terminal (130-1) may be located within the cell coverage of the fourth base station (120-1). The sixth terminal (130-6) may be located within the cell coverage of the fifth base station (120-2).

[0055] Here, each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as NB (NodeB), eNB (evolved NodeB), gNB, ABS (advanced base station), HR-BS (high reliability-base station), BTS (base transceiver station), radio base station, radio transceiver, access point, access node, RAS (radio access station), MMR-BS (mobile multihop relay-base station), RS (relay station), ARS (advanced relay station), HR-RS (high reliability-relay station), HNB (home NodeB), HeNB (home eNodeB), RSU (road side unit), RRH (radio remote head), TP (transmission point), TRP (transmission and reception point), etc.

[0056] Each of the multiple terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as UE (user equipment), TE (terminal equipment), AMS (advanced mobile station), HR-MS (high reliability-mobile station), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, OBU (on broad unit), etc.

[0057] Meanwhile, each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may operate in different frequency bands or in the same frequency band. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to each other via an ideal backhaul link or a non-ideal backhaul link, and may exchange information with each other via an ideal backhaul link or a non-ideal backhaul link. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to a core network via an ideal backhaul link or a non-ideal backhaul link. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.

[0058] In addition, each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) can support MIMO (multi-input multi-output) transmission (e.g., SU (single user)-MIMO, MU (multi user)-MIMO, massive MIMO, etc.), CoMP (coordinated multipoint) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, device-to-device communication (D2D) (or ProSe (proximity services)), IoT (Internet of Things) communication, dual connectivity (DC), etc. Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2). For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO method, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) based on the SU-MIMO method. Alternatively, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive a signal from the second base station (110-2) by the MU-MIMO method.

[0059] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP method, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) by the CoMP method. Each of the multiple base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive signals based on the CA method with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage area. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control D2D between the fourth terminal (130-4) and the fifth terminal (130-5), and each of the fourth terminal (130-4) and the fifth terminal (130-5) can perform D2D by controlling each of the second base station (110-2) and the third base station (110-3).

[0060] Next, methods of operation of communication nodes in a communication system will be described. Even when a method performed by a first communication node among the communication nodes (e.g., transmission or reception of a signal) is described, the corresponding second communication node may perform a method corresponding to the method performed by the first communication node (e.g., reception or transmission of a signal). In other words, when the operation of a terminal is described, the corresponding base station may perform an operation corresponding to the operation of the terminal. Conversely, when the operation of a base station is described, the corresponding terminal may perform an operation corresponding to the operation of the base station.

[0061] Meanwhile, up to 128 Channel State Information-Reference Signal (CSI-RS) resource ports may be supported in the Frequency Range 1 (FR1) band. To improve Type-I and Type-II codebooks, existing resources having up to 32 CSI-RS resource ports may be expanded to support a total of up to 128 CSI-RS resource ports across all resources. In this disclosure, CSI-RS may be interpreted as non-zero power (NZP) CSI-RS or zero power (ZP) CSI-RS depending on the context.

[0062] For a low-complexity receiver having six or eight receiving antennas supporting four or more layers, a method for grouping Sounding Reference Signal (SRS) ports and a method for assigning codewords associated with SRS port grouping can be proposed. In the present disclosure, methods for efficient CSI acquisition in large-scale antenna port configurations can be proposed.

[0063] The present disclosure may describe embodiments using terms from 3GPP LTE and 3GPP 5G NR (New Radio) standards. The embodiments of the present disclosure may be implemented in other specific or general wireless communication systems based on the same or similar definitions. A Physical Downlink Control Channel (PDCCH) may generally correspond to an uplink control channel. A Physical Downlink Shared Channel (PDSCH) may generally correspond to an uplink data channel. A Demolation Reference Signal (DMRS) may correspond to a reference signal or pilot signal for channel estimation. Terms such as User, User Equipment (UE), and Terminal may be considered to have the same meaning.

[0064] "The base station signaling information (e.g., configuration information) to the terminal" may mean "the base station setting information to the terminal." When the terminal receives configuration information from the base station, it may perform operations related to transmission and reception based on said configuration information. In the present disclosure, "signaling" may mean "the base station transmitting specific configuration or control information to the terminal" and / or "the terminal transmitting specific configuration or control information to the base station." The terminal may receive specific configuration or control information signaled from the base station and perform transmission and reception processing based thereon. The base station may receive specific configuration or control information signaled from the terminal and perform transmission and reception processing based thereon.

[0065] In the present disclosure, transmitters and receivers according to the communication direction may be defined as shown in Table 1 below.

[0066]

[0067] The present disclosure may express symbols or signals without distinguishing between singular and plural. In the present disclosure, a symbol may mean a singular symbol or a plurality of symbols. In the present disclosure, a signal may mean a singular signal or a plurality of signals. In the present disclosure, a symbol without a separate modifier may mean a modulation symbol. A symbol with a separate modifier may include an OFDM symbol or a multicarrier (MC) symbol. A modulation symbol may mean a result processed so that it can be distinguished using at least one of phase, amplitude, or frequency. A modulation symbol may correspond to the result of undergoing a modulation process by modulation techniques such as (π / 2-)BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), or QAM (Quadrature Amplitude Modulation). A signal may consist of a sequence (or list) or a set of symbols composed of a singular modulation symbol or a plurality of modulation symbols assigned to multiple resources. In the present disclosure, sequences and lists may be collectively referred to as sequences.

[0068] Data from a transport channel can be transmitted through a physical channel. A transport channel may have a mapping relationship with a logical channel. Message and information bits corresponding to the data or payload of the transport channel can be transmitted through the physical channel. Modulation symbols generated from the message and information bits constituting the transport block can be transmitted through the physical channel. Through a mapping structure between channels, data from the upper layer can be converted into signals of the physical layer and transmitted.

[0069] A set described in this disclosure may be defined as comprising one or more elements unless otherwise noted. For example, a first set composed of first elements may mean that the number of first elements belonging to said set is one or more. The number of first elements included within a set of first elements may be considered to be one or more.

[0070] The present disclosure may describe aspects that are commonly applicable to the signaling method and apparatus of various configuration information described below. A first entity (e.g., a first communication node) and a second entity (e.g., a second communication node) may be used as general terms and may be replaced by other specific elements described below. First configuration information and second configuration information may be replaced by other specific elements described below. A first identifier list and a second identifier list may be replaced by other specific elements described below.

[0071] Configuration information may refer to at least one of a message, an information block, an information element, or a field that indicates a specific configuration. Configuration information may be defined as a configuration unit comprising one or more messages, one or more information blocks, one or more information elements, or one or more fields. Signaling may be performed in a static, semi-static, or dynamic manner. Signaling may be performed through at least one of a Master Information Block (MIB), a System Information Block (SIB), a Radio Resource Control (RRC) message, a Medium Access Control Element (MAC CE), or Downlink Control Information (DCI).

[0072] The first entity may apply the first configuration information received through signaling from the second entity. The first entity may apply the received first configuration information if there is no first configuration information currently in use. If there is first configuration information currently in use, the first entity may apply the received first configuration information by replacing the existing first configuration information with the first configuration information. The first entity may apply the first configuration information only when specific predefined conditions are satisfied.

[0073] The absence of the first configuration information may mean a state in which the first configuration information received through signaling does not exist. The absence of the first configuration information may mean a state in which the application period or timer of the first configuration information has expired and the application of the first configuration information has been released. The first entity may release or deactivate the application of the first configuration information currently in use upon receiving signaling from the second entity. The release of the application of the first configuration information may be indicated through release information included in the signaling. The release of the application of the first configuration information may be indicated by the exclusion of the first configuration information from the signaling.

[0074] In the present disclosure, the first setting information may be configured to include one or more second setting information. The first setting information may be the one or more second setting information itself. Alternatively, the first setting information may include identifiers corresponding to the second setting information. The identifiers corresponding to the one or more second setting information may be included in the first setting information in the form of a list composed of said identifiers.

[0075] A first identifier list composed of the corresponding identifiers may be configured to add new settings for one or more second setting information or to replace existing settings. A second identifier list composed of the corresponding identifiers may be configured to release, remove, or disable settings for one or more second setting information. The first entity can efficiently manage multiple second setting information by receiving signaling containing the identifier lists. Through the configuration of identifiers in the form of lists, the settings of communication resources can be flexibly changed or updated.

[0076] A codeword corresponding to a transmission block or one or more symbols constituting the codeword may be mapped to one or more layers. To transmit a codeword to each of one or more terminals scheduled together on the same one or more first resources, one or more layers for each terminal may be mapped to one or more first antenna ports. A layer may be a logical unit uniquely defined within each terminal. A first antenna port may be a logical unit uniquely defined across multiple terminals. The types of first antenna ports may include at least some of PDCCH ports, PDSCH ports, or DMRS ports, and may include other types of antenna ports. A PDCCH port may mean a PDCCH antenna port. A PDSCH port may mean a PDSCH antenna port. A DMRS port may mean a DMRS antenna port.

[0077] The first resources can be defined as resources within the time-frequency domain. For example, a single time-frequency resource may correspond to a resource element (RE) that constitutes a resource grid in the time-frequency domain. A resource element may be defined as a resource corresponding to a single subcarrier within a single OFDM symbol. The mapping between the layer and the first antenna port can be established as a one-to-one correspondence.

[0078] Each of one or more first antenna ports can be mapped to one or more second antenna ports by precoding. The second antenna port types may include at least one of a CSI-RS port (e.g., a CSI-RS antenna port) or an SRS port (e.g., an SRS receiving port, an SRS antenna port), and other types of antenna ports may be included.

[0079] As a mapping between a first antenna port and a second antenna port, symbols or signals output from each first antenna port may be spread to one or more second antenna ports. By said spreading, a weighted sum or linear combination of symbols or signals output from one or more first antenna ports may be input to one second antenna port. The present disclosure can efficiently virtualize and control physical antenna resources through a mapping structure between ports.

[0080] Each second antenna port may be mapped to one or more TXRUs (Transceiver Units). From a transmission perspective, a weighted sum or linear combination of symbols or signals output from one or more second antenna ports may be input to each TXRU. From a reception perspective, a weighted sum or linear combination of symbols or signals output from one or more TXRUs may be input to each second antenna port.

[0081] The mapping between one or more second antenna ports and one or more TXRUs may be referred to as antenna port virtualization, TXRU-to-port virtualization, or port-to-TXRU virtualization. In antenna port virtualization, if the weight between a second antenna port and a TXRU is 0, they may not be physically connected. Conversely, if a second antenna port and a TXRU are not physically connected, the weight between them in antenna port virtualization may be considered 0. A structure in which each of the second antenna ports is mapped to all TXRUs may be referred to as a fully-connected structure. A structure in which each of the second antenna ports is mapped to one or more partial TXRUs may be referred to as a subarray-partitioned structure.

[0082] One or more TXRUs may be mapped to one or more antenna elements (Antenna Elements or AEs). From a transmission perspective, a weighted sum or linear combination of symbols or signals output from one or more TXRUs may be input to each antenna element. From a reception perspective, a weighted sum or linear combination of symbols or signals output from one or more antenna elements may be input to each TXRU.

[0083] The mapping between one or more TXRUs and one or more antenna elements may be referred to as TXRU virtualization, antenna element-to-TXRU virtualization, or TXRU-to-antenna element virtualization. In TXRU virtualization, if the weight between the TXRU and the antenna element is 0, they may not be physically connected. Conversely, if the TXRU and the antenna element are not physically connected, the weight between them in TXRU virtualization may be considered 0. A structure in which each TXRU is mapped to all antenna elements may be referred to as a fully-connected structure. A structure in which each TXRU is mapped to one or more antenna elements may be referred to as a subarray-partitioned structure.

[0084] The base station may set up CSI reporting for the terminal to acquire the CSI measured by the terminal. The CSI may include at least one of CRI (CSI-RS Resource Indicator), RI (Rank Indicator), PMI (Precoding Matrix Indicator), CQI (Channel Quality Indicator), or LI (Layer Indicator).

[0085] The CSI report setting information that the base station signals to the terminal may include at least one of the following information.

[0086] - Report configuration type: The report configuration type can refer to the time-domain behavior of the report configuration.

[0087] - Reported Quantity: The reported quantity may be defined as the composition of one or more CSI parameters subject to reporting. Among the CSI parameters subject to reporting, those that do not require reporting may be excluded from measurement, calculation, or reporting.

[0088] - Channel measurement resource configuration information: Channel measurement resource configuration information can be defined as configuration information for NZP (Non-Zero-Power) CSI-RS resources for channel measurement. The terminal can check the configuration of the channel measurement resource through the channel measurement resource configuration information.

[0089] - CSI-IM (Interference Measurement) resource configuration information for interference measurement

[0090] - NZP CSI-RS resource configuration information for interference measurement

[0091] - Codebook settings information

[0092] Unless otherwise noted in the present disclosure, NZP CSI-RS and CSI-RS may be interpreted as having the same meaning. A channel measurement operation of a terminal may be performed through an NZP CSI-RS resource referred to by channel measurement resource setting information. Unless otherwise noted in the present disclosure, NZP CSI-RS resources and CSI-RS resources may be interpreted as having the same meaning. An NZP CSI-RS resource set and a CSI-RS resource set may be interpreted as having the same meaning.

[0093] CSI-IM resource configuration information for interference measurement may refer to configuration information for CSI-IM resources for interference measurement. A terminal can check the CSI-IM-based interference measurement resource configuration through the CSI-IM resource configuration information. NZP CSI-RS resource configuration information for interference measurement may refer to NZP CSI-RS-based interference measurement resource configuration information. A terminal can check the NZP CSI-RS resource configuration for interference measurement through the NZP CSI-RS resource configuration information. A base station may signal at least one of channel measurement resource configuration information, CSI-IM-based interference measurement resource configuration information, or NZP CSI-RS-based interference measurement resource configuration information to the terminal. Through such signaling, the corresponding resources may be configured for the terminal.

[0094] The terminal can measure CSI based on at least one of a channel measurement resource, a CSI-IM-based interference measurement resource, or an NZP CSI-RS-based interference measurement resource, according to the CSI reporting setting configured from the base station. The terminal can transmit a UCI containing CSI to the base station based on resource allocation information indicated by the reporting configuration type. The resource allocation information may include at least one of slot setting information or PUCCH resource information for CSI transmission.

[0095] In the case of non-periodic CSI reporting, the base station may dynamically direct the terminal's CSI reporting through triggering DCI signaling that includes a CSI request. The CSI reported by the terminal may be received by the base station. Based on the received CSI, the base station may perform at least one of scheduling, resource allocation, or link adaptation for data channel transmission.

[0096] [Transmission of Uplink Control Information for Codebook-Based CSI Acquisition]

[0097] The terminal may measure CSI based on the base station's CSI reporting settings. In the case of non-periodic CSI, the terminal may operate based on a CSI request within a triggering DCI signaled by the base station. CSI may be measured based on at least one of a channel measurement resource, a CSI-IM-based interference measurement resource, or an NZP CSI-RS-based interference measurement resource. The measured CSI may be packed or mapped into a UCI. The terminal may transmit a UCI containing CSI to the base station on the PUCCH. Alternatively, the terminal may multiplex a UCI containing CSI on the PUSCH and transmit it to the base station. Each CSI parameter may consist of one or more UCI fields.

[0098] In the case of CQI, if RI is set to 5 or higher, CQI for the first codeword (CW) or the first transmission block (TB) and CQI for the second codeword can be configured. In the case of PMI for a Type-I single panel codebook, CSI fields for basis selection for the spatial domain, offset selection within the same oversampling group, and co-phase, respectively, can be configured. Basis selection for the spatial domain can be performed separately for the N1 direction and the N2 direction.

[0099] The CSI field configuration or CSI field length for each CSI parameter may be fixedly defined. The CSI field configuration or CSI field length for each CSI parameter may be variably determined by other CSI parameters. The CSI field configuration may include one or more fields. The CSI field length may refer to the bit width. The configuration of the CQI may be variably determined based on the RI value. If RI is 4 or less, only the CQI for the first codeword may be included in the CSI field. If RI is 5 or more, the CQIs for the first and second codewords, respectively, may be included in the CSI field.

[0100] A CSI may be composed of a one-part or two-part structure and packed into a UCI. A communication node (e.g., a base station and / or a terminal) may calculate the size of the UCI for a CSI composed of a one-part structure (hereinafter referred to as the one-part CSI) by assuming that all CSI fields corresponding to the CSI parameters to be reported are mapped to the UCI. A CSI composed of two parts (hereinafter referred to as the two-part CSI) may be composed of a Part 1 CSI and a Part 2 CSI. The Part 1 CSI may include CSI fields among the CSI parameters to be reported that have a fixed field length and are fixedly mapped to the UCI. The remaining CSI fields may be included in the Part 2 CSI. Whether each CSI field belonging to the Part 2 CSI is mapped to the UCI, or the length of each CSI field mapped to the UCI, may be determined by the CSI parameters belonging to the Part 1 CSI or the CSI fields for this purpose.

[0101] In the present disclosure, wideband CSI may refer to the following cases depending on the configuration of the CSI parameters of the report quantity.

[0102] First, broadband CSI may refer to a case where both broadband CQI and broadband PMI are included in the CSI parameters of the reported volume. In this case, broadband CQI may refer to a state where the CQI format indicator, which is a higher-layer parameter, is set to widebandCQI, and broadband PMI may refer to a state where the PMI format indicator, which is a higher-layer parameter, is set to widebandPMI.

[0103] Second, broadband CSI may refer to a case where only broadband CQI is included among the CSI parameters of the reported volume, and PMI is not included. Even in this case, broadband CQI may refer to a state where the CQI format indicator, which is a higher-level parameter, is set to widebandCQI.

[0104] A terminal can map a broadband CSI (e.g., CSI parameter(s) included in the broadband CSI or CSI field(s) for the CSI parameter(s)) to a UCI and transmit the UCI to a base station via a PUCCH. Alternatively, the terminal can multiplex the UCI on a PUCCH and transmit it to a base station. Methods using a single-part CSI or a dual-part CSI when the terminal transmits the UCI to a base station may be proposed. Such methods may be applied for at least the first case of reporting a broadband CSI for Scheme-B of a Type-I SP (single-panel) codebook via a PUCCH.

[0105] In the method using a single-part CSI, the CSI fields may consist of fields for RI, the CQI of the first codeword, the CQI of the second codeword, and PMI. The CQI for the second codeword may be included in the single-part CSI if the RI is 5 or greater. The length of the CSI field for PMI may be determined differently depending on the set RI.

[0106] In the first case, one or more CSI fields for PMI may include a PMI field for spatial domain basis selection, a PMI field for spatial domain basis oversampling (or rotation or up-rotation) factor, and a PMI field for cross-polarization phase matching (co-phase). A communication node may configure the PMI fields as follows based on the reporting scope of each field. The PMI field for spatial domain basis selection and the PMI field for spatial domain basis oversampling factor may be included within the same CSI field because they are subject only to wideband PMI reporting. On the other hand, the PMI field for cross-polarization phase matching may be included in a separate CSI field because it is subject to both wideband PMI reporting and subband PMI reporting.

[0107] In a method using dual-part CSI, the CSI may be configured by dividing it into a first CSI part (Part 1 CSI) and a second CSI part (Part 2 CSI). The first CSI part may include CSI fields for the RI and the CQI of the first codeword (or transmission block). The second CSI part may include one or more CSI fields for the CQI of the second codeword (or transmission block) and the PMI. The CQI for the second codeword may be included in the second CSI part if the RI is 5 or greater. The lengths of the CSI fields for the PMI may be determined differently based on the RI value included in the first CSI part.

[0108] In the first case, the PMI fields included in the second CSI part may consist of a PMI field for spatial domain basis selection, a PMI field for spatial domain basis oversampling (or rotation or up-rotation) factor, and a PMI field for cross-polarization phase matching. Based on the reporting scope of each field, the communication node may configure the PMI fields within the second CSI part as follows. The PMI field for spatial domain basis selection and the PMI field for spatial domain basis oversampling factor may be included within the same CSI field as they are subject only to wideband PMI reporting. On the other hand, the PMI field for cross-polarization phase matching may be included in a separate CSI field as it is subject to both wideband PMI reporting and subband PMI reporting.

[0109] The communication system may specify the use of either single-part CSI or dual-part CSI for broadband CSI reporting. Accordingly, the network and terminals can configure and transmit CSI based on a predefined method.

[0110] - Method 1000 (Method using only single-part CSI)

[0111] According to Method 1000, a communication system may be required to use only a single-part CSI when reporting broadband CSI. A terminal may generate a CSI with a single-part structure in accordance with the above requirement and transmit the generated CSI to a base station.

[0112] - Method 2000 (Method using only dual-part CSI)

[0113] According to Method 2000, a communication system may specify that only dual-part CSIs be used when reporting broadband CSIs. A terminal may generate a CSI in a dual-part structure including a first CSI part and a second CSI part in accordance with the said specification, and may transmit the generated CSI to a base station. When using dual-part CSIs, a situation may occur where the payload size of a UCI containing the CSI is smaller than the minimum input size required to perform polar coding. For example, in a situation where the minimum input size for polar coding is defined as 12 bits, the payload size after UCI mapping may be less than 12 bits. To minimize the implementation complexity of the terminal, if the payload size of a UCI containing the CSI is smaller than the said minimum input size (e.g., 12 bits), the terminal may perform zero padding sufficient to meet that size. After the UCI payload size is adjusted to the minimum input size of 12 bits through this zero padding, the encoding procedure for the UCI payload can be performed.

[0114] - Method 2100 (How to use either single-part CSI or dual-part CSI depending on network configuration)

[0115] According to Method 2100, a base station (e.g., a network) can configure, through upper-layer signaling, whether a terminal should use a single-part CSI or a dual-part CSI. The terminal can generate a CSI based on the part type configured by the base station and can perform reporting on the generated CSI.

[0116] - Method 2200 (Method using either single-part CSI or dual-part CSI according to predefined rules)

[0117] According to Method 2200, a communication node may selectively use either a single-part CSI or a dual-part CSI based on predefined rules. The terminal is N Rep (N Rep >=1) CSI reports can be mapped to a single UCI and transmitted. In this case, the terminal is N Rep and threshold (e.g., K Rep1 The part type can be determined based on the comparison result between ).

[0118] The first rule for determining the part type can be as follows. N Rep Ga K Rep1 If it is greater than or equal to, the terminal can use dual-part CSI. Otherwise (e.g., N Rep Ga K Rep1 (If less than or smaller), the terminal can use a single-part CSI.

[0119] The second rule for determining the part type can be as follows: N Rep Ga K Rep2 If it is less than or equal to, the terminal can use a single-part CSI. Otherwise (e.g., N Rep Ga K Rep2 (if larger or greater), the terminal can use dual-part CSI.

[0120] K, the threshold used in the above rule Rep1 and / or K Rep2 can be a fixed value predefined in the communication system. Alternatively, the base station sends K to the terminal through upper-layer signaling. Rep1 and / or K Rep2 It can be configured. The terminal can generate a CSI of the part type determined according to the above rule and can perform reporting on the generated CSI.

[0121] Whether a single-part CSI or a dual-part CSI is used may be determined differently or identically based on the PUCCH format. First, an embodiment in which the part configuration method is determined differently depending on the PUCCH format may be defined. For example, in PUCCH format 2, which transmits a relatively small payload, Method 1000 using a single-part CSI may be applied. On the other hand, in PUCCH format 3 or format 4, which allows for the transmission of a larger payload, a dual-part CSI or a single-part SCI may be used based on any one of Method 2000, Method 2100, or Method 2200. Next, an embodiment in which the part configuration method is determined identically regardless of the PUCCH format may be defined. For example, Method 1000 using a single-part CSI may be applied collectively for all PUCCH formats 2, 3, and 4. As another example, any one of Method 2000, Method 2100, or Method 2200 may be commonly applied to all PUCCH formats 2, 3, and 4.

[0122] The terminal can generate a CSI by selecting an appropriate method between a single-part structure or a dual-part structure based on the PUCCH format used for transmission and the base station settings, and can transmit the generated CSI to the base station. The base station can obtain CSI parameters from the received UCI based on rules corresponding to the PUCCH format used.

[0123] The terminal may support the use of a single-part CSI by default. Conversely, whether a dual-part CSI is used may be determined based on a first terminal capability (UE capability) report. The first terminal capability may include information regarding whether the terminal supports a multi-part (including dual-part) CSI configuration.

[0124] Application of terminal capability in Method 2100

[0125] In cases where the part type is determined by network configuration as in Method 2100, the base station may perform the configuration by taking into account the first terminal capability. If the terminal does not support multi-part CSI usage, the base station may configure the terminal to use only single-part CSI. If the terminal reports that it does not support multi-part CSI usage, the terminal may not expect the base station to configure multi-part CSI usage.

[0126] Application of terminal capability in Method 2200

[0127] Even when the part type is determined according to a predefined rule, as in Method 2200, the first terminal capability may be given priority consideration. If the terminal does not support multi-part CSI usage, the terminal is N Rep Predefined rules regarding thresholds may not be applied. In this case, the terminal may perform reporting using a single-part CSI regardless of whether the conditions in the rules are satisfied.

[0128] [SRS Port Grouping, CSI Acquisition, Data Channel Transmission and Reception for Low Complexity MIMO Receivers]

[0129] A method for SRS port grouping to support low-complexity MIMO receivers and a channel control method utilizing the same will be described. When a terminal receives a PDSCH assigned to more than four layers, typically two codewords may be transmitted. To achieve high reception performance in such multi-codeword transmissions, a process must be involved to effectively suppress or eliminate interference occurring between layers assigned to different codewords. However, handling interference between layers belonging to different codewords at the terminal side imposes high implementation complexity on the terminal. Therefore, for terminals supporting low-complexity MIMO receivers, the base station may directly perform operations to eliminate interference between codewords or interference between layers belonging to different codewords. The base station may utilize SRS port grouping information to perform precoding so that layers assigned to each codeword are spatially separated, or to allocate resources in a direction that minimizes interference.

[0130] When a base station acquires channel information based on an SRS transmitted from a terminal and performs downlink precoding, the SRS ports can be operated by dividing them into multiple groups. Specifically, the base station can divide the SRS ports into two groups, and can map the first SRS port group to the first codeword (or codeword 0) and the second SRS port group to the second codeword (or codeword 1). According to this configuration, when a terminal receives a PDSCH containing two codewords, it can receive each codeword through the corresponding SRS port group. For example, the terminal can receive codeword 0 through ports belonging to the first SRS port group and codeword 1 through ports belonging to the second SRS port group. At this time, when the ports belonging to each SRS port group receive the corresponding codeword, the communication node can proceed with demodulation and decoding assuming that there is no interference from other codewords. This is based on the premise that the base station controls interference between SRS port groups in advance before transmission, and thus can provide the effect of reducing the complexity of receiver implementation on the terminal side. In the configuration of SRS ports for each SRS port group, the first SRS port group is P SRS Among the ports P SRS / It can be composed of 2 even-indexed ports, and the 2nd SRS port group is P SRS Among the ports P SRS / It can be composed of 2 odd-indexed ports.

[0131] When a terminal supporting a low-complexity MIMO receiver receives a PDSCH assigned to four or fewer layers, only a single codeword may be transmitted. If the base station transmits the codeword without having prior knowledge of the terminal's receiver operation, there is a possibility that the terminal's reception performance may degrade. To prevent this, the base station may transmit NZP CSI-RS through CSI-RS ports associated with channel measurement resources for PDSCH transmission and corresponding CSI measurement.

[0132] In this case, the base station may specifically assume the types of the terminal's receiving SRS port groups as described below, and can perform precoding based on said assumptions. The precoding operation according to the types of SRS port groups assumed by the base station can be defined as follows.

[0133] 1st receiving SRS port group type

[0134] The first receiving SRS port group type may mean that the terminal receives signals using only the ports belonging to the first SRS port group. In this case, the terminal may not utilize the resources or ports allocated to the second SRS port group for reception.

[0135] 2nd receiving SRS port group type

[0136] The second receiving SRS port group type may mean that the terminal receives signals using only the ports belonging to the second SRS port group. In this case, the terminal may not utilize the resources or ports allocated to the first SRS port group for reception.

[0137] Third receiving SRS port group type

[0138] The third receiving SRS port group type may mean that the terminal receives signals by utilizing all ports belonging to the first SRS port group and the second SRS port group. In the third receiving SRS port group type, the terminal can perform the following detailed receiving operations. First, the terminal can receive signals for all layers through the first SRS port group and can also receive signals for all layers through the second SRS port group. Subsequently, the terminal can perform decoding individually for the demodulation results for each SRS port group. Second, the terminal can combine the two demodulation results obtained from the first SRS port group and the second SRS port group, respectively. By performing decoding based on the combined result, the terminal can obtain an effect of improving the reception diversity gain or the signal-to-noise ratio.

[0139] 4th receiving SRS port group type

[0140] The fourth receiving SRS port group type may mean that the terminal receives a signal using all ports belonging to the first SRS port group and the second SRS port group. In this type, the terminal can perform receiving operations by dividing the entire layers into two groups, and can reduce receiving complexity by performing interference control only within each group.

[0141] Specifically, the terminal can receive signals for half of the layers through the first SRS port group and signals for the remaining half of the layers through the second SRS port group. Subsequently, the terminal can aggregate the demodulation results for each port group to perform final decoding. Regarding the method for considering inter-layer interference, when demodulating signals for layers corresponding to a specific SRS port group, the terminal may consider only the interference between layers belonging to that SRS port group. In other words, the terminal may not consider interference arising from layers corresponding to different SRS port groups.

[0142] If the total number of layers transmitted is odd, the same number of layers cannot be allocated to the first SRS port group and the second SRS port group. In this case, the number of layers corresponding to one SRS port group may be allocated such that it is one more than the remaining SRS port group. For example, when the total number of layers is L, if L is odd, the number of layers L1 allocated to the first SRS port group and the number of layers L2 allocated to the second SRS port group may be configured to satisfy |L1 - L2| = 1.

[0143] Rank and Layer can be mapped as shown in Table 2 below.

[0144]

[0145] The receiving SRS port group (or receiving SRS port group type) assumed by the base station during downlink transmission and the receiving SRS port group (or receiving SRS port group type) actually used by the terminal during reception may differ. To address this, the following methods can be proposed to align the reception assumptions between the base station and the terminal.

[0146] - Method 3000 (Method for determining incoming SRS port groups based on predefined rules)

[0147] According to Method 3000, a base station may predefine a terminal's receiving SRS port group (or receiving SRS port group type) for PDSCH transmission through four or fewer layers (e.g., Rank ≤ 4) to which SRS channel acquisition-based downlink precoding is applied. This rule may apply equally to NZP CSI-RS transmission intended for CSI acquisition as well as to PDSCH transmission. According to Method 3000, a rule to use a specific receiving SRS port group type may be predefined between the terminal and the base station. Therefore, the terminal may not expect the base station to transmit PDSCH assuming the use of a receiving SRS port group other than the predefined type. In this case, the terminal's receiving SRS port group type predefined may be set to any one of a first receiving SRS port group type, a second receiving SRS port group type, a third receiving SRS port group type, or a fourth receiving SRS port group type.

[0148] - Method 3100 (Method for determining incoming SRS port group based on network configuration)

[0149] According to Method 3100, a base station may set a receiving SRS port group (or receiving SRS port group type) of a terminal for PDSCH transmission through four or fewer layers (e.g., Rank ≤ 4) with downlink precoding based on SRS channel acquisition applied. The base station may transmit information regarding the receiving SRS port group that the terminal should apply through upper layer signaling or physical layer control signals. The terminal may perform the operation of receiving the PDSCH based on the receiving SRS port group or receiving SRS port group type set by the base station.

[0150] The terminal may define support for at least one of a first receiving SRS port group type, a second receiving SRS port group type, a third receiving SRS port group type, or a fourth receiving SRS port group type as a terminal capability (UE capability) and may report the terminal capability to the base station. One specific type among the four types may be predefined as being supported by the terminal by default.

[0151] When a receiving SRS port group type is predefined as in Method 3000, the base station may operate in consideration of the terminal's capabilities. Specifically, if a specific predefined type is not included in the supported range of the receiving SRS port group type reported by the terminal, the default type may be applied to the terminal. Alternatively, the terminal may perform a receiving operation based on the default type. This prevents the application of a receiving setting that exceeds the terminal's actual implementation capabilities.

[0152] When a base station explicitly sets a receiving SRS port group type as in Method 3100, the base station may set the type only within the supported types based on the terminal capabilities reported by the terminal. Therefore, the terminal may not expect a receiving SRS port group type that it does not support to be set by the base station.

[0153] [Channel Measurement and Interference Measurement Method for CSI Acquisition Based on CRI (CSI-RS Resource Indicator)]

[0154] The base station may transmit CSI reporting settings to the terminal. The CSI reporting settings may include Ks (e.g., Ks≥2 or Ks>1) channel measurement resources and Ks (e.g., Ks≥2 or Ks>1) interference measurement resources. Here, the channel measurement resources may refer to NZP CSI-RS resources or CSI-RS resources, and the interference measurement resources may refer to CSI-IM-based interference measurement resources.

[0155] The terminal can perform CSI measurements on pairs of channel measurement resources and CSI-IM-based interference measurement resources configured by the base station. The terminal can select M CRIs based on the measured results. Here, M may be less than or equal to a predefined value (e.g., Mmax) that is greater than or equal to 1 and not greater than Ks. The maximum value of M may vary depending on the codebook type configured between the base station and the terminal. The maximum value of M may also be determined differently depending on the terminal capability (UE capability) reported by the terminal to the base station.

[0156] The terminal may generate a CSI including an RI, a PMI, and a CQI for each of the selected M CRIs. Alternatively, the terminal may generate a CSI including an RI, a PMI, and a CQI based on each CRI. The terminal may generate a CSI that additionally includes a Layer Indicator (LI) as needed. The terminal may report the generated CSI to the base station. The base station may receive the CSI from the terminal.

[0157] The base station may configure a channel measurement resource set and an interference measurement resource set, respectively, for the CSI measurement of the terminal. Each resource set may include a list of sub-resources, and an index-based association may be defined between the two lists. The NZP (Non-Zero Power) CSI-RS resources used for channel measurement may be configured as a single NZP-CSI-RS-ResourceSet. Within the NZP-CSI-RS resource set, the list containing the actual channel measurement resources may be configured through the nzp-CSI-RS-Resources field. The nzp-CSI-RS-Resources field may be defined as a sequence consisting of NZP-CSI-RS-ResourceIds that uniquely identify each channel measurement resource. The CSI-IM resources used for interference measurement may be configured as a single CSI-IM-ResourceSet. Within the CSI-IM resource set, the list containing the interference measurement resources may be configured through the csi-IM-Resources field. The csi-IM-Resources field can be defined as a sequence of CSI-IM-ResourceIds that uniquely identify each CSI-IM resource.

[0158] Resources located in the same entry order within the aforementioned channel measurement resource list and CSI-IM-based interference measurement resource list may have a one-to-one correspondence with each other. For example, the i-th entry in the channel measurement resource list, NZP-CSI-RS-ResourceId, and the i-th entry in the interference measurement resource list, CSI-IM-ResourceId, may be associated to form a single measurement unit (pair). In this case, the entry order or index within the list may be a CRI. In other words, when a terminal selects and reports a specific CRI, it may mean transmitting CSI information calculated based on the pair of channel measurement resource and interference measurement resource located at that index. By configuring the order of the two lists identically, the base station can control the terminal to perform independent measurements for each resource pair without a separate, complex mapping process.

[0159] In the embodiments below, the CRI-based CSI report described above may be referred to as the first CSI report. The first CSI report configuration may include resource configurations for interference measurement as well as channel measurement. When interference measurement is performed through NZP CSI-RS resources, the set of NZP CSI-RS resources for interference measurement may consist of a single CSI-RS resource. M, which indicates the number of CRIs to be selected and reported by the terminal, may be included in the CSI report configuration information (CSI-ReportConfig) as an upper-level parameter and configured for the terminal. The terminal may select the optimal resource based on M configured by the base station and generate related CSI information.

[0160] In a non-periodic reporting configuration, the base station M according to terminal capability R (M R <M)개의 CSI-RS 자원을 미리 선택하여 설정하는 경우, 단말의 보고 동작은 다음과 같이 정의될 수 있다. 단말은 (M - M RCan transmit a CSI report containing ) CRIs. The terminal is configured M R Even if you do not include the CRI in the CSI report, M R A CSI report containing CSI parameters (e.g., RI, PMI, CQI, and / or LI) conditioned on each of the CRIs can be transmitted. Through this, the base station can obtain detailed channel state information regarding resources it has pre-specified from the terminal. When improving CRI-based CSI reporting, the terminal may be limited to using only conventional codebooks.

[0161] It can be assumed that at least one of different antenna port virtualization and TXRU virtualization is applied to different channel measurement resources. The terminal can assume that Type D Quasi-Colocation (QCL) is established on a resource-wise basis for the configured channel measurement resource(s) and CSI-IM-based interference measurement resource(s). Type D QCL may imply similarity regarding spatial reception parameters, which may indicate that the terminal can use the same reception beam or spatial filter when receiving the resources. Based on the aforementioned virtualization and QCL assumptions, the terminal can determine that the channel measurement resource and the interference measurement resource corresponding to the same CRI have the same spatial directivity. Therefore, the terminal can measure interference associated with the resource by maintaining the reception beam used when measuring the channel.

[0162] In performing non-periodic CSI reporting, the terminal may use periodic CSI-RS, semi-fixed CSI-RS, or non-periodic CSI-RS as the measurement target. The base station may set multiple trigger state configuration information for non-periodic CSI reporting for the terminal. Each trigger state may be associated with one or more CSI reporting configuration information that the terminal must perform when a trigger is indicated through the CSI request field of the DCI.

[0163] The terminal may receive a DCI containing a CSI request field. The terminal may measure a reference signal according to reporting configuration information regarding a trigger state associated with the code point of the CSI request. The reference signal may include at least one of CSI-RS for channel measurement, CSI-RS for interference measurement, CSI-IM, or SSB. After measuring the reference signal, the terminal may perform a non-periodic CSI report.

[0164] In a non-periodic CSI report where a non-periodic CSI-RS is used, a terminal receiving a triggering DCI can determine the slot in which the non-periodic CSI-RS is transmitted. The terminal can determine the slot from the triggering offset set by the upper layer parameter aperiodicTriggeringOffset. aperiodicTriggeringOffset may be included in the non-periodic CSI-RS resource set configuration information. The resource set configuration information may correspond to an NZP-CSI-RS-ResourceSet in which the resourceType in CSI-ResourceConfig is set to aperiodic. The first definition of aperiodicTriggeringOffset may be as follows.

[0165] - 1st definition: Offset X may represent the interval between a slot containing a DCI that triggers a set of non-periodic NZP CSI-RS resources and a slot in which the set of CSI-RS resources is actually transmitted.

[0166] The triggering offset of each aperiodic CSI-RS resource included within an aperiodic CSI-RS resource set (or a set of aperiodic CSI-RS resources) may consist of two levels of slot offsets. The resource set level slot offset may refer to an offset that applies commonly to all resources belonging to the set of aperiodic CSI-RS resources. This may represent the interval between the slot containing the DCI that triggers the set of aperiodic CSI-RS resources and the earliest slot in which the said aperiodic CSI-RS resource set can be transmitted. The base station may apply the value set by the aperiodicTriggeringOffset parameter as the resource set level slot offset. Instead of using aperiodicTriggeringOffset, the base station may define a new, separate upper-layer parameter to indicate the resource set level slot offset and provide it to the terminal.

[0167] The resource-level slot offset may refer to an offset applied per CSI-RS resource. This may represent an additional slot offset based on the aforementioned resource set-level slot offset. In other words, even within the same resource set, each CSI-RS resource may be transmitted in different slots depending on the resource-level slot offset value. In this disclosure, the resource-level slot offset and the additional slot offset (or additional offset) may be used interchangeably. The resource-level slot offset may be set so that each of the CSI-RS resources constituting the CSI-RS transmitted to different beams in hybrid beamforming is located in the same slot or different slots. In other words, according to the resource-level offset, CSI-RS transmission based on different beams may be transmitted in the same slot or different slots. When more than 32 CSI-RS ports are configured as described below, and CSI-RS resources consisting of 32 or fewer ports are aggregated, according to the resource-level slot offset, each CSI-RS resource may be configured for transmission in the same slot or different slots. In other words, for both purposes, when configuring multiple CSI-RS resources, resource-level slot offsets can be used to indicate transmission to the same slot or different slots for each CSI-RS resource. Alternatively, resource-level slot offsets may be used for other purposes.

[0168] In the present disclosure, the term "CSI-RS resource offset" may mean the final offset between a slot containing a DCI that triggers a set of non-periodic CSI-RS resources and a slot in which a specific CSI-RS resource within said set is transmitted. The CSI-RS resource offset may mean a CSI-RS triggering offset or a CSI-RS non-periodic triggering offset. A set of non-periodic CSI-RS resources to which such a hierarchical offset structure is applied may be used for channel measurement or interference measurement. Thus, the set of non-periodic CSI-RS resources may function as a channel measurement resource or an interference measurement resource.

[0169] The methods for setting the aforementioned resource level slot offsets will be explained.

[0170] Resource level slot offset is from 0 to 0 max It can have a value between. The resource level slot offset can be defined based on the following mathematical formula 1.

[0171]

[0172] The maximum value is O max can be predefined between the base station and the terminal. Or a specific value selected by the base station from a certain set of candidate values ​​(e.g., O max ) can be configured for the terminal through upper-layer signaling. O max can be defined based on terminal capability. O max If defined based on terminal capability, the terminal has the maximum value it can support (e.g., O max ) can be reported to the base station. The base station may select an appropriate value considering the capability reported by the terminal, and the selected value (e.g., O max ) can be set on the terminal.

[0173] - Method 4000

[0174] The specific field configuration and mapping method for assigning individual slot offsets to each non-periodic CSI-RS resource included in a non-periodic CSI-RS resource set may be as follows. The base station may define a resource-level slot offset field for each non-periodic CSI-RS resource included in the non-periodic CSI-RS resource set. The resource-level slot offset field is log2(O max + 1) It can be composed of bits. Here, O max may refer to the maximum value of the previously defined offset. The resource-level slot offset field may be included in the form of a sequence within the configuration information of a non-periodic CSI-RS resource set (or NZP-CSI-RS-ResourceSet). A one-to-one correspondence based on the order of items may be established between the resource-level slot offset field in sequence form and the actual CSI-RS resources. Specifically, the base station may apply the same order to the resource identifiers listed in the nzp-CSI-RS-Resources field and the items listed in the resource-level slot offset sequence. The detailed mapping operation resulting from this may be as follows.

[0175] - The first entry in the resource level slot offset field can be applied to the NZP CSI-RS resource corresponding to the first entry in nzp-CSI-RS-Resources.

[0176] - The second entry in the resource level slot offset field can be applied to the NZP CSI-RS resource corresponding to the second entry in nzp-CSI-RS-Resources.

[0177] - The remaining items can also be applied sequentially to each NZP CSI-RS resource according to the index order within the sequence.

[0178] - Method 4100

[0179] To determine the slot location of an aperiodic CSI-RS resource, the method of configuring the offset field at the individual resource level rather than the resource set level may be as follows. According to Method 4100, the resource-level slot offset field may be defined within the individual aperiodic CSI-RS resource configuration information rather than within the aperiodic CSI-RS resource set configuration information. The resource-level slot offset field is log2(O max It may consist of ) bits. The resource level slot offset field may be defined as an optional field. Specifically, the resource level slot offset field may be included in individual resource configuration information when the resource level slot offset value is 1 or greater. If the additional offset value applied to a non-periodic CSI-RS resource is 0, the base station may not transmit the resource level slot offset field.

[0180] - Method 4200

[0181] To set resource-specific slot offsets within a set of non-periodic CSI-RS resources, the method of grouping resources according to offset values ​​and defining them in separate fields may be as follows. The nzp-CSI-RS-Resources field included in the NZP-CSI-RS-ResourceSet may be restricted to include non-periodic CSI-RS resources with a resource-level slot offset of 0. The terminal may determine that the CSI-RS resources listed in the nzp-CSI-RS-Resources field are used for transmission without additional delay in the slot indicated by the resource set-level slot offset. To define non-periodic CSI-RS resources with a resource-level slot offset of k (k>0), the base station may additionally define nzp-CSI-RS-Resources fields specialized for each offset value within the resource set setting. The resource-level slot offset value k may be assigned to the name of the nzp-CSI-RS-Resources field. For example, a field named nzp-CSI-RS-Resources-AdditionalOneSlotOffset may be used to refer to resources with an offset of 1.

[0182] The nzp-CSI-RS-Resources field corresponding to the resource level slot offset k may be included in the configuration information if there is at least one non-periodic CSI-RS resource to which the offset value is set. In other words, the nzp-CSI-RS-Resources fields may be considered optional fields.

[0183] - Method 4300

[0184] To efficiently manage resources having a resource-level slot offset greater than 0 within a set of non-periodic CSI-RS resources, a first sequence may be defined. A base station may further define the first sequence for non-periodic CSI-RS resources to which a resource-level slot offset k (k > 0) applies. The first sequence may have a structure that includes sub-sequences composed of multiple NZP CSI-RS resource identifiers as items. The offset mapping rule according to the order of each item in the first sequence may be as follows.

[0185] - The first item of the first sequence may consist of a sequence referring to NZP CSI-RS resources to which resource level slot offset 1 applies.

[0186] - The second item of the first sequence may consist of a sequence referring to NZP CSI-RS resources to which resource level slot offset 2 applies.

[0187] Subsequent items can also have sequential offset values ​​in the same way.

[0188] The length of the first sequence is from 1 to 0 max It can be set to a value between O max If is 1, the first sequence may be represented as a single sequence itself referring to multiple NZP CSI-RS resources without a separate nesting structure. The first sequence may be included in the configuration information if there is at least one NZP CSI-RS resource with a resource level slot offset greater than 0 set. In other words, the first sequence may be defined as an optional field.

[0189] If a base station uses the aperiodicTriggeringOffset defined in the technical specification as is to indicate a resource set-level slot offset, a technical contradiction with the first definition may occur. A second definition for aperiodicTriggeringOffset may be added. Unlike the first definition, the second definition may define aperiodicTriggeringOffset as follows: aperiodicTriggeringOffset may be defined as an offset value (or offset X) between a slot containing a DCI that triggers a CSI report associated with a set of non-periodic NZP CSI-RS resources and the earliest slot in which said set of CSI-RS resources (or CSI-RS resources within the set) can be transmitted or transmitted. The second definition may be applied restrictively in specific configurations where the first definition cannot be established. The second definition having the above-described characteristics may be as follows.

[0190] - 2-1 Definition: Offset X may mean the interval between the slot containing the DCI that triggers the non-periodic NZP CSI-RS resource set (or the CSI report associated with the non-periodic NZP CSI-RS resource set) and the earliest slot where the non-periodic NZP CSI-RS resource set may be located (or transmitted). Any one of additionalOneSlotOffset, additionalOneSlotOffsetDoppler, or additionalSlotOffset-r19 may represent an additional slot offset relative to offset X.

[0191] - Section 2-2 Definition: Offset X may represent the interval between the slot containing the DCI that triggers the non-periodic NZP CSI-RS resource set (or the CSI report associated with the non-periodic NZP CSI-RS resource set) and the earliest slot where the non-periodic NZP CSI-RS resource set may be located (or transmitted). An additional slot offset for Offset X may be set for each CSI-RS resource within the non-periodic CSI-RS resource set through any one of the following parameters.

[0192] - NZP-CSI-RS-Resource additionalOneSlotOffset or additionalSlotOffset-r19: Additional offsets can be defined at the individual resource level.

[0193] - additionalOneSlotOffsetDoppler in NZP-CSI-RS-ResourceSet: Additional offsets at individual resource levels within a CSI-RS resource group can be defined.

[0194] - Section 2-3 Definition: Offset X may represent the interval between the slot containing the DCI that triggers the non-periodic NZP CSI-RS resource set (or the CSI report associated with the non-periodic NZP CSI-RS resource set) and the earliest slot where the non-periodic NZP CSI-RS resource set is located (or transmitted). Any one of additionalOneSlotOffset, additionalOneSlotOffsetDoppler, or additionalSlotOffset-r19 may represent an additional slot offset relative to Offset X. The additional slot offset set by additionalOneSlotOffset may indicate the case where one additional slot offset is applied. The non-configuration of additionalOneSlotOffset may mean that no additional slot offset is applied. The additional slot offset set by additionalOneSlotOffsetDoppler may indicate whether one additional slot offset is applied or the additional slot offset value itself.

[0195] - Section 2-4 Definition: Offset X may represent the interval between the slot containing the DCI that triggers the non-periodic NZP CSI-RS resource set (or the CSI report associated with the non-periodic NZP CSI-RS resource set) and the earliest slot where the non-periodic NZP CSI-RS resource set is located (or transmitted). An additional slot offset for Offset X may be set for each CSI-RS resource within the non-periodic CSI-RS resource set through any one of the following parameters.

[0196] - NZP-CSI-RS-Resource additionalOneSlotOffset or additionalSlotOffset-r19: Additional offsets can be defined at the individual resource level.

[0197] - additionalOneSlotOffsetDoppler in NZP-CSI-RS-ResourceSet: Additional offsets at individual resource levels within a CSI-RS resource group can be defined.

[0198] The additional slot offset related parameters used in the definitions 2-1 through 2-4 described above may be defined as follows, depending on the type and setting conditions of the codebook.

[0199] additionalOneSlotOffset may be a parameter associated with CSI-ReportConfig that configures a Rel-19 Type-I codebook (typeI-SinglePanel-r19 or typeI-MultiPanel-r19) or a Rel-19 Type-II codebook (eTypeII-r19 or typeII-FePortSelection-r19). additionalOneSlotOffset may be based on the slot offset set by the aperiodicTriggeringOffset of NZP-CSI-RS-ResourceSet. Whether or not an additional slot offset is applied for each CSI-RS resource may be determined by additionalOneSlotOffset.

[0200] additionalOneSlotOffsetDoppler may be a parameter associated with CSI-ReportConfig, which configures the Rel-19 Type-II Doppler codebook (typeII-Doppler-r19). additionalOneSlotOffsetDoppler may be a higher-level parameter consisting of a bit sequence whose length is the number of CSI-RS resources within a CSI-RS resource group (e.g., the number of CSI-RS resources aggregated per CSI-RS resource group). The k-th bit of additionalOneSlotOffsetDoppler may indicate whether an additional slot offset is applied to the k-th CSI-RS resources within a CSI-RS resource group of the associated non-periodic CSI-RS resource set. The k-th bit of additionalOneSlotOffsetDoppler may be applied commonly to the k-th CSI-RS resources within all CSI-RS resource groups of the said non-periodic CSI-RS resource set.

[0201] For example, if the k-th bit of additionalOneSlotOffsetDoppler is 0, this may indicate that no additional slot offset is applied to the k-th CSI-RS resources (k=0, ..., K-1, where K is the number of CSI-RS resources in the CSI-RS resource group) (or that the additional slot offset value is 0). If the k-th bit of additionalOneSlotOffsetDoppler is 1, this may indicate that one additional slot offset is applied to the k-th CSI-RS resources (or that the additional slot offset value is 1). additionalOneSlotOffsetDoppler may be based on the CSI-RS resource group slot offset given by NZP-CSI-RS-ResourceSet based on the slot offset set by aperiodicTriggeringOffset and the offset set by aperiodicResourceOffset.

[0202] aperiodicResourceOffset may be a parameter associated with CSI-ReportConfig for configuring a Type-II Doppler codebook. For typeII-Doppler-r18, aperiodicResourceOffset may represent an offset (e.g., a slot-unit offset) between two consecutive CSI-RS resources within a CSI-RS resource set. For typeII-Doppler-r19, aperiodicResourceOffset may represent an offset (e.g., a slot-unit offset) between CSI-RS resources in the first slot within two consecutive non-periodic CSI-RS resource groups. Here, an additional slot offset for the CSI-RS resource in the first slot within the non-periodic CSI-RS resource group may not be set. In other words, among the bits of additionalOneSlotOffsetDoppler, the bit value for the corresponding CSI-RS resource may indicate that an additional slot offset is not set. The j-th (j=0, ..., K) DOPP - 1 and, K DOPP (where is the number of CSI-RS resource groups in the aperiodic CSI-RS resource set) The slot offset for a CSI-RS resource group (e.g., CSI-RS resource group slot offset) can be given by X + m(j - 1), where m can be the offset value represented by aperiodicResourceOffset. For example, m can be set to either 1 or 2.

[0203] The resourceType of NZP-CSI-RS-ResourceSet may be set to aperiodic or satisfy a predefined first condition. In this case, the additional slot offset may be interpreted as additionalSlotOffset-r19. additionalSlotOffset-r19 may be based on the slot offset set by aperiodicTriggeringOffset. For each CSI-RS resource, the additional slot offset as a resource-level slot offset may be set by additionalSlotOffset-r19.

[0204] The NZP-CSI-RS-ResourceSet satisfying the first condition is K as a non-periodic NZP-CSI-RS-ResourceSet for channel measurement. s This may mean a case where it includes resources greater than 1. The set of resources can be associated with a CSI-ReportConfig configured with the upper-level parameter valueOfM. The report configuration may have any one of the following combinations: First, reportQuantity may be set to cri-RI-PMI-CQI or cri-RI-LI-PMI-CQI, and at the same time, codebookType may be set to typeI-SinglePanel. Second, reportQuantity may be set to cri-RI-PMI-CQI, and at the same time, codebookType may be set to typeII-r16.

[0205] The additionalOneSlotOffset, additionalOneSlotOffsetDoppler, and additionalSlotOffset-r19 mentioned in this disclosure may be changed to other names to the extent that their technical meaning is maintained. A second definition may be specified immediately after the existing first definition within the technical specification. Specifying a second definition within the technical specification may be intended to support codebook improvements that are currently being standardized in Release 19 NR MIMO Phase 5. The second definition may include consideration of additionalOneSlotOffset and additionalOneSlotOffsetDoppler, which are parameters closely associated with codebook improvements.

[0206] A method for mathematically incorporating a resource-level slot offset into a mathematical formula for aperiodic CSI-RS transmission slot (e.g., Equation 2 below) will be proposed. For a terminal where ca-SlotOffset is not set, when the triggering DCI is included in slot n and the triggering offset given by aperiodicTriggeringOffset is X, the slot S in which aperiodic CSI-RS is transmitted can be determined based on Equation 2 below.

[0207]

[0208] Since Equation 2 assumes a configuration in which all resources within a resource set are transmitted in the same slot, it may not accurately reflect the transmission timing in a configuration where a resource-level slot offset is individually set for each CSI-RS resource. To solve the above problem, the resource-level slot offset individually set for each CSI-RS resource can be defined as Y. By adding Y to Equation 2, the final transmission slot S can be determined. The slot S in which non-periodic CSI-RS is transmitted can be determined based on Equation 3 below.

[0209]

[0210] X is a value given by aperiodicTriggeringOffset and may represent a resource set-level slot offset. Y may represent a resource-level slot offset added per resource. To modify Equation 2, Method 5000 and / or Method 5100 below may be applied. The transmission slot may represent a slot in which CSI-RS is transmitted.

[0211] - Method 5000

[0212] The mathematical formula defined in the technical specification (e.g., Equation 2) may be maintained as is, but specific conditions for applying Equation 2 may be defined. This may apply to cases where resource-level slot offsets are not additionally considered. In other words, if no additional delay value is included within the individual resource settings, the terminal may determine the transmission slot using Equation 2 based on the technical specification.

[0213] - Method 5100

[0214] A first variable related to the resource-level slot offset may be additionally reflected in the existing mathematical formula for determining the transmission slot. For example, if the slot where the triggering DCI is received is n, the offset (e.g., reference offset) is X, and the first variable is Y, the transmission slot S where the non-periodic CSI-RS is transmitted can be defined based on mathematical formula 3.

[0215] The terminal can determine the final transmission slot by assigning different values ​​to the first variable Y depending on whether the resource level slot offset is set.

[0216] - When additionally considering a resource-level slot offset: The terminal may assign a resource-level slot offset value to the first variable. In this case, a resource-level slot offset may be set for each CSI-RS resource.

[0217] - If resource level slot offset is not additionally considered: the terminal can assign 0 to the first variable.

[0218] X can be interpreted with different meanings as follows according to the first and second definitions of aperiodicTriggeringOffset.

[0219] - Situation where resource-level slot offsets are additionally considered: X may mean resource-set-level slot offsets according to the second definition.

[0220] - Situation where resource-level slot offsets are not additionally considered: X may represent the existing triggering offset according to the first definition.

[0221] Modification of the second mathematical formula may also be applied in the same way for codebook improvement and optimization of related procedures. The base station may calculate the resource level slot offset differently depending on the type and value of the upper layer parameter set for the terminal and reflect this in the mathematical formula.

[0222] - When applying additionalSlotOffset-r19: The terminal may add the value indicated by additionalSlotOffset-r19 to Equation 2.

[0223] - When applying additionalOneSlotOffset: The terminal may add 1 to Equation 2 if the setting value of additionalOneSlotOffset is enabled. The terminal may add 0 to Equation 2 if additionalOneSlotOffset is not set.

[0224] - When applying additionalOneSlotOffsetDoppler: The terminal may add 1 to Equation 2 if the corresponding setting value of additionalOneSlotOffsetDoppler indicates an additional slot offset setting. The terminal may add 0 to Equation 2 if the corresponding setting value of additionalOneSlotOffsetDoppler indicates that no additional slot offset is set. Alternatively, if the corresponding setting value of additionalSlotOffsetDoppler indicates the additional slot offset value itself, the terminal may add the additional slot offset value itself to Equation 2.

[0225] For each CSI-RS resource, an additional slot offset can be set based on the parameters described above. The mathematical formula for determining the final transmission slot S reflecting the additional slot offset can be expressed as follows.

[0226]

[0227] In Equation 4, the resource-level slot offset may refer to a value determined by one of the three parameters described above. The resource-level slot offset, additionalOneSlotOffset, may not be set on the terminal. If the resource-level slot offset is given as additionalOneSlotOffsetDoppler, the corresponding setting value of additionalOneSlotOffsetDoppler may indicate that no additional slot offset is set or that the additional slot offset value itself is 0. In this case, the terminal may operate based on Equation 2 without reflecting the additional offset.

[0228] When NZP CSI-RS and CSI-IM are used together for aperiodic CSI reporting, the base station can control the transmission slots of the resources so that interference measurements coincide with the time of channel measurements. According to the technical specifications, it is assumed that all resources within a set of aperiodic NZP CSI-RS resources are transmitted in the same slot. Accordingly, the triggering offset of CSI-IM can be specified to follow the triggering offset of the associated NZP CSI-RS for channel measurements. Consequently, all resources within a set of aperiodic CSI-IM resources can be configured within a single slot identical to that of the associated CSI-RS.

[0229] Based on embodiments of the present disclosure, resources within a non-periodic NZP CSI-RS resource set may not be limited to a single slot. A resource-level slot offset may be set for each CSI-RS resource. An individual resource-level slot offset may be added to the triggering offset at the resource set level. NZP CSI-RS resources belonging to the same non-periodic NZP CSI-RS resource set may be transmitted in the same slot or different slots depending on the configuration.

[0230] As NZP CSI-RS resources are deployed across multiple slots, the locations of CSI-IM resources associated with NZP CSI-RS resources need to be defined individually. The resource location of CSI-IM associated with NZP CSI-RS for each channel measurement (CSI-IM resource occupancy) can be configured for each CSI-IM resource within a non-periodic set of CSI-IM resources. A CSI-IM resource occupancy may refer to a slot to which a CSI-IM resource is assigned, a slot in which a CSI-IM resource is configured, or a slot containing a CSI-IM resource.

[0231] Each triggering offset of non-periodic CSI-IM resources may be composed of the sum of a resource set-level slot offset and a resource-level slot offset. If each triggering offset of non-periodic CSI-IM resources has a resource-level slot offset of zero or has the same resource-level slot offset, each triggering offset may be composed solely of the resource set-level slot offset. The resource set-level slot offset may be applied commonly to all CSI-IM resources within a non-periodic CSI-IM resource set. The resource-level slot offset may be applied individually to each CSI-IM resource. The above offsets may be defined as follows based on the time of DCI reception. First, the triggering offset may refer to the interval between the slot containing the DCI that triggers the set of non-periodic CSI-IM resources and the slot to which the CSI-IM resource is assigned. Second, the resource set-level slot offset may refer to the interval between the slot containing the DCI and the earliest slot to which the CSI-IM resource set can be assigned. Third, the resource-level slot offset may refer to an additional slot offset relative to the resource set-level slot offset. An additional slot offset may be set for each CSI-RS resource. An individual resource-level slot offset may also be set for each of the resources within the set of non-periodic CSI-IM resources associated with the CSI-RS resource. Method 6000, Method 6100, Method 6200, or Method 6300 may be applied as a specific procedure for configuring the triggering offset of the non-periodic CSI-IM.

[0232] - Method 6000

[0233] According to Method 6000, a resource set level slot offset of a non-periodic CSI-IM may be included in CSI-IM resource set configuration information. For each CSI-IM resource, a resource level slot offset may be included as an additional slot offset in individual non-periodic CSI-IM resource configuration information.

[0234] - Method 6001

[0235] Method 6001 may basically follow the configuration structure of Method 6000. In Method 6001, numerical constraints may be added for synchronization with channel measurement resources. According to Method 6001, the resource set level slot offset of a non-periodic CSI-IM may be included in the resource set configuration information, and for each CSI-IM resource, the resource level slot offset may be set as an additional slot offset within the individual resource configuration information. However, the resource level slot offset value of the non-periodic CSI-IM may be restricted so as not to be greater than the resource level slot offset value of the non-periodic CSI-RS associated for channel measurement.

[0236] - Method 6010

[0237] According to Method 6010, the resource set level slot offset of an aperiodic CSI-IM may follow or be based on the resource set level slot offset of the associated aperiodic CSI-RS for channel measurement. For each CSI-IM resource, the resource level slot offset may be included within the individual aperiodic CSI-IM resource configuration information as an additional slot offset.

[0238] - Method 6011

[0239] Method 6011 may basically follow the configuration structure of Method 6010. Numerical constraints may be added to Method 6011. In other words, the resource-level slot offset set for each CSI-IM resource may be determined within a range not greater than the resource-level slot offset of the non-periodic CSI-RS associated with the CSI-IM resource.

[0240] - Method 6100

[0241] The resource set level slot offset of the aperiodic CSI-IM may follow or be applied based on the resource set level slot offset of the associated aperiodic CSI-RS for channel measurements. The resource level slot offset of the aperiodic CSI-IM may follow or be applied based on the resource level slot offset of the aperiodic CSI-RS associated with the aperiodic CSI-IM. The triggering offset of the CSI-IM may follow or be applied based on the triggering offset of the associated NZP CSI-RS for channel measurements.

[0242] In methods 6000, 6001, 6010, and 6011, the corresponding parameters may be defined such that the candidate setting value for the resource-level slot offset for CSI-IM is identical to the candidate setting value for the resource-level slot offset for NZP CSI-RS. When applying methods 6010 and 6011, the aperiodicTriggeringOffset defined in the technical specification may be applied as the resource set slot offset for aperiodic CSI-IM. The resource-level slot offset for CSI-IM may be defined as a higher-level parameter. The resource-level slot offset for CSI-IM may be set to the terminal via RRC signaling.

[0243] A single NZP CSI-RS resource for interference measurement may be configured in association with a set of NZP CSI-RS resources for channel measurement. When aperiodic CSI-RS is used for aperiodic CSI reporting, CSI-RS resources within the set of aperiodic NZP CSI-RS resources for channel measurement may be configured in association with a single NZP CSI-RS resource for interference measurement. Unlike the technical specifications, the slots in which aperiodic NZP CSI-RS resources are transmitted may differ; accordingly, the slot in which the NZP CSI-RS resource for interference measurement, which is commonly associated with the aperiodic NZP CSI-RS resources, is transmitted may be configured or predefined. The NZP CSI-RS resource for interference measurement may be configured with the same configuration information as the NZP CSI-RS resource for channel measurement, and one of the following methods may be applied for this purpose.

[0244] - Method 7000

[0245] According to Method 7000, a resource set level slot offset of a non-periodic CSI-RS for interference measurement may be included in CSI-RS resource set configuration information. A resource level slot offset of an individual CSI-RS resource belonging to a non-periodic CSI-RS resource set for interference measurement may be included in individual CSI-RS resource configuration information.

[0246] - Method 7010

[0247] According to Method 7010, a resource set level slot offset of an aperiodic CSI-RS for interference measurement may follow or be based on a resource set level slot offset of an associated aperiodic CSI-RS for channel measurement. In this case, the resource level slot offset of an individual CSI-RS resource belonging to the aperiodic CSI-RS resource set for interference measurement may be included in the resource setting information of the aperiodic CSI-RS resource set for interference measurement.

[0248] - Method 7100

[0249] According to Method 7100, the resource set level slot offset of an aperiodic CSI-RS for interference measurement may follow or be applied based on the resource set level slot offset of the associated aperiodic CSI-RS for channel measurement. The resource level slot offset may follow or be applied to the smallest value among the resource level slot offsets of the associated aperiodic CSI-RS or aperiodic CSI-RS resources for channel measurement.

[0250] - Method 7200

[0251] According to Method 7200, the resource set level slot offset of the aperiodic CSI-RS for interference measurement may be set to follow the resource set level slot offset of the associated aperiodic CSI-RS for channel measurement. In this case, the resource level slot offset may be fixed to 0. The resource set level slot offset may correspond to the triggering offset of the associated aperiodic CSI-RS for channel measurement transmitted in the first slot. The triggering offset of the aperiodic CSI-RS for interference measurement may follow the triggering offset of the associated aperiodic CSI-RS for channel measurement transmitted in the first slot or the last slot.

[0252] [Channel Measurement and Interference Measurement Methods for CSI Acquisition Excluding CRI Reporting]

[0253] Definitions of setting-related parameters or terms mentioned in the following content may have been mentioned in previous content.

[0254] Codebooks that support 48, 64, or 128 CSI-RS ports, exceeding the 32 CSI-RS ports in a communication system, may be supported. Type-I codebooks may have a new structure or form different from conventional codebooks, such as in spatial domain basis selection. Type-II codebooks can support an extended number of CSI-RS ports while maintaining the same structure or form as conventional codebooks. Since conventional CSI-RS resources support a maximum of 32 ports, a set of CSI-RS resources for channel measurement with an extended number of ports exceeding this can be configured by aggregating K (K > 1) CSI-RS resources. For the aggregated CSI-RS resources, the same qcl-info, powerControlOffset, and powerControlOffsetSS may be commonly configured. The terminal may expect (e.g., assume, estimate) that at least one of qcl-info, powerControlOffset, or powerControlOffsetSS is set commonly for all CSI-RS resources included in the CSI-RS resource set. qcl-info may mean QCL information set to be applied commonly to all CSI-RS resources included in the CSI-RS resource set. powerControlOffset may mean a power control offset set to be applied commonly to all CSI-RS resources included in the CSI-RS resource set. powerControlOffsetSS may mean an SSB-based power control offset set to be applied commonly to all CSI-RS resources included in the CSI-RS resource set.

[0255] Resource aggregation of a CSI-RS resource set for channel measurement can be configured within a single slot or across two adjacent slots. A single CSI-IM resource or a single NZP CSI-RS resource for interference measurement can be established in association with K CSI-RS resources within the CSI-RS resource set for channel measurement.

[0256] In performing aperiodic CSI reporting, periodic CSI-RS, semi-fixed CSI-RS, or aperiodic CSI-RS may be used as reference signals. A terminal may receive multiple trigger state setting information for aperiodic CSI reporting from a base station. When a trigger is indicated via the CSI request field of the DCI, each trigger state may be associated with one or more setting information for the CSI reporting performed by the terminal. Upon receiving a DCI containing the CSI request field, the terminal may perform a measurement based on the trigger state associated with the codepoint of the CSI request field. Depending on the reporting setting information, the terminal may measure reference signals such as CSI-RS for channel measurement, CSI-RS for interference measurement, CSI-IM, or SSB, and perform aperiodic CSI reporting including the measurement results. In the case of aperiodic CSI reporting where aperiodic CSI-RS is used, the terminal receiving the triggering DCI may determine the slot in which the aperiodic CSI-RS is transmitted. At this time, the terminal can determine the transmission slot of the non-periodic CSI-RS based on the triggering offset set by the upper layer parameter aperiodicTriggeringOffset.

[0257] To support an expanded number of CSI-RS ports, aggregated CSI-RS resources for channel measurement may be allocated across up to two adjacent slots, and a single CSI-IM resource or a single NZP CSI-RS resource for interference measurement may be established in association with these channel measurement resources. In this case, since channel measurement resources may be transmitted across multiple slots while interference measurement resources are established as a single resource, unlike conventional technical specifications, a clear setting or pre-definition of the slot occasion to which the CSI-IM resource or NZP CSI-RS for interference measurement is allocated or included may be required. To determine the transmission slot (e.g., slot occasion), various embodiments proposed in the aforementioned "CRI-based channel measurement and interference measurement method for CSI acquisition" may be applied in the same or similar ways.

[0258] When aperiodic CSI-RS is used for aperiodic CSI reporting, the above-described methods 6000, 6001, 6010, 6011, or 6100 may be applied to set the triggering offset of CSI-IM. In this case, the value of the resource-level slot offset may be limited to {0, 1}. When defining the upper-level parameter, the upper-level parameter may be set to enabled when the resource-level slot offset is 1, and the upper-level parameter may not be set when the resource-level slot offset is 0. In other words, the above-described additionalOneSlotOffset or additionalOneSlotOffsetDoppler may be used as a parameter to set the resource-level slot offset.

[0259] Method 7200 described above may be applied in a modified form to determine the triggering offset of the aperiodic CSI-IM in an aperiodic CSI reporting configuration. In Method 7200, "aperiodic CSI-RS for interference measurement" may be applied by replacing it with "aperiodic CSI-IM". In Method 7200, "aperiodic CSI-RS for interference measurement" may be replaced with "aperiodic CSI-IM", and "resource level slot offset to be fixed to 0" may be replaced with "resource level slot offset to be fixed to 1". According to the modified method, the triggering offset of the aperiodic CSI-IM may follow the triggering offset of the associated aperiodic CSI-RS for channel measurement in the first slot or the second slot (e.g., if the associated aperiodic CSI-RS transmission for channel measurement is limited within two consecutive slots, the second slot may be referred to as the last slot). In other words, the offset of the aperiodic CSI-IM resource (or the aperiodic triggering offset of the CSI-IM resource) may follow the offset of the associated aperiodic CSI-RS resource(s) for the channel measurement configured without additionalOneSlotOffset. The CSI-IM configuration method may be applied when the Rel-19 Type-I and Type-II codebooks are configured.

[0260] When the Rel-19 Type-II Doppler codebook is configured, multiple CSI-RS resource groups may be configured within the CSI-RS resource set for channel measurements. The multiple CSI-RS resource groups may be configured as 4, 8, or 12 groups. The number of multiple CSI-RS resource groups is determined by the upper-layer parameter K. DOPP It can be indicated through. In the technical specifications, the upper layer parameter K DOPP The name of may be defined differently. K DOPP can be set to one of the values ​​{4, 8, 12}. KDOPP ...can be included in the CSI configuration information. Each CSI-RS resource group may consist of K (K > 1) CSI-RS resources aggregated to support an extended number of CSI-RS ports. In this case, the triggering offset determination methods described above may be applied based on the first CSI-RS resource group, the last CSI-RS resource group, or a specific CSI-RS resource group configured by the base station.

[0261] Each CSI-RS resource group may refer to multiple CSI-RS resources for aggregation associated with the same set of CSI-RS resources. To support an extended number of CSI-RS ports of 48, 64, or 128, each CSI-RS resource group may consist of resources aggregated within the same set of CSI-RS resources. As an example where a Type-II Doppler codebook is configured, the triggering offset of aperiodic CSI-IM (or the aperiodic triggering offset of a CSI-IM resource) may follow the triggering offset of CSI-RS transmitted in the first slot of the first CSI-RS resource group (or the offset of the CSI-RS resource(s)). This may mean following the offset of CSI-RS transmitted in the first slot across all CSI-RS resource groups. As another example where a Type-II Doppler codebook is configured, the triggering offset of aperiodic CSI-IM (or the aperiodic triggering offset of a CSI-IM resource) may follow the triggering offset of the CSI-RS transmitted in the last slot of the last CSI-RS resource group (or the offset of the CSI-RS resource(s)). This may mean following the triggering offset of the CSI-RS transmitted in the last slot across all CSI-RS resource groups.

[0262] In setting the triggering offset of the aperiodic CSI-RS for interference measurement, the above-described methods for determining the offset of the aperiodic CSI-IM may be applied in the same way. In the contents described in Method 6000, Method 6001, Method 6010, Method 6011, and Method 6100, "aperiodic CSI-IM" may be replaced with "aperiodic CSI-RS for interference measurement." To prevent the terminal from having the same effect as the above methods, the terminal may be restricted from expecting to receive the aperiodic CSI-RS setting for interference measurement. When applying Method 7200, "the resource level slot offset shall be fixed to 0" may be replaced with "the resource level slot offset shall be fixed to 1". The above method for setting the aperiodic CSI-RS for interference measurement may be applied when the Rel-19 Type-I and Type-II codebooks are configured.

[0263] When a Rel-19 Type-II Doppler codebook is configured, multiple CSI-RS resource groups (e.g., 4, 8, or 12 groups) may be configured within a set of CSI-RS resources for channel measurement. The triggering offset of the non-periodic CSI-RS for interference measurement may be determined based on the methods described above with respect to the first CSI-RS resource group, the last CSI-RS resource group, or a specific CSI-RS resource group configured by the base station. For example, the triggering offset of the non-periodic CSI-RS for interference measurement may follow the triggering offset of the NZP CSI-RS transmitted in the first slot of the first CSI-RS resource group (e.g., the first slot among the slots where the CSI-RS resource groups are configured). As another example, the triggering offset of the non-periodic CSI-RS for interference measurement may follow the triggering offset of the NZP CSI-RS transmitted in the last slot of the last CSI-RS resource group (e.g., the last slot among the slots where the CSI-RS resource groups are set). If a Type-II Doppler codebook is set, the terminal may be restricted from expecting to receive the non-periodic CSI-RS setting for interference measurement so as not to have the same effect as the above methods.

[0264] If an NZP CSI-RS resource set for channel measurement is configured acyclically and an acyclic CSI report (or CSI report-related configuration parameter) associated with the NZP CSI-RS resource set is configured with the type II-Doppler-r19 codebook, the acyclic triggering offset of the CSI-IM resource (or the triggering offset of the acyclic CSI-IM resource) can be determined as follows.

[0265] - The triggering offset of aperiodic CSI-IM may follow the triggering offset of the CSI-RS transmitted in the first slot of the first CSI-RS resource group (or the first slot across CSI-RS resource groups).

[0266] - The triggering offset of a non-periodic CSI-IM may follow the triggering offset of the CSI-RS transmitted at the last slot of the last CSI-RS resource group (or the last slot across CSI-RS resource groups).

[0267] - The non-periodic triggering offset of the CSI-IM resource can follow the NZP CSI-RS resource(s) within the first associated NZP CSI-RS resource group for channel measurements set without additionalOneSlotOffsetDoppler.

[0268] - The non-periodic triggering offset of the CSI-IM resource may follow the NZP CSI-RS resource(s) within the first NZP CSI-RS resource group associated with the channel measurement, which is configured to apply one additional slot offset by the corresponding bit value of additionalOneSlotOffsetDoppler.

[0269] - The non-periodic triggering offset of the CSI-IM resource may follow the NZP CSI-RS resource(s) within the first NZP CSI-RS resource group associated with the channel measurement, where the additional slot offset is set to 1 by the corresponding bit value of additionalOneSlotOffsetDoppler.

[0270] For a CSI report configured with a Type-II Doppler codebook or a terminal configured with a Type-II Doppler codebook, the operation when a set of CSI-RS resources for channel measurement corresponding to the CSI report or Type-II Doppler codebook is configured acyclically may be as follows. Within the set of CSI-RS resources for acyclically channel measurement, KDOPP 1 CSI-RS resource group (or K DOPP × K CSI-RS resources) can be configured. For CQI calculation or computation, the terminal uses all configured K DOPP It can be assumed that the same (PDSCH) EPRE (Energy Per Resource Element) to CSI-RS EPRE ratio is applied to CSI-RS resources belonging to or associated with CSI-RS resource groups. When the terminal performs CQI calculation or operation, all of the above K DOPP For × K configured CSI-RS resources, it can be assumed that the (PDSCH) EPRE to CSI-RS EPRE ratio is the same.

[0271] The base station is configured for all K that conform to the terminal's computational assumptions. DOPP CSI-RS can be transmitted to CSI-RS resources within CSI-RS resource groups to have the same CSI-RS EPRE. Within a non-periodic CSI-RS resource set configuration for channel measurement, a total of K DOPP × K CSI-RS resources are sorted in ascending order of their respective CSI-RS resource IDs (e.g., {0, 1, ... , K-1, K, K+1, ... , 2K-1, ... , (K DOPP - 1)K, (K DOPP - 1)K+1, ... , (K DOPP- It can be arranged as {1)K-1}). For all CSI-RS resources within a non-periodic CSI-RS resource set, the same values ​​of qcl-InfoPeriodicCSI-RS, powerControlOffset, and powerControlOffsetSS may be commonly set. The time interval between two consecutive CSI-RS resource groups may be defined as the time interval between the first CSI-RS resources of each CSI-RS resource group (e.g., in slot units), and the terminal may receive the corresponding time (or slot) interval information (e.g., aperiodicResourceOffset) from the base station. The terminal receives the K set from the base station. DOPP By measuring CSI-RS for groups of CSI-RS resources, the predicted CSI or PMI can be determined, and the predicted CSI or PMI can be reported to the base station.

[0272] CSI measurement and reporting based on the above-described embodiments (e.g., methods) can be performed as follows.

[0273] Figure 3 is a flowchart illustrating the method of CSI measurement and reporting.

[0274] Referring to FIG. 3, the base station can generate CSI configuration information (S310). The CSI configuration information may include CSI measurement configuration information (CSI-MeasConfig), CSI report configuration information (CSI-ReportConfig), etc. The CSI configuration information may include at least one of CSI-RS resource information for non-periodic channel measurement (e.g., CSI-RS resource set information), CSI-IM resource information for non-periodic interference measurement (e.g., CSI-IM resource set information), codebook information, or offset information.

[0275] Codebook information may indicate a Type-II Doppler codebook. Offset information may include at least one of aperiodicTriggeringOffset, aperiodicResourceOffset, additionalOneSlotOffset, or additionalOneSlotOffsetDoppler. aperiodicTriggeringOffset may be referred to as triggering offset information. aperiodicResourceOffset may be referred to as resource offset information. additionalOneSlotOffset may be referred to as additional offset information. additionalOneSlotOffsetDoppler may be referred to as additional Doppler offset information. The value set by aperiodicTriggeringOffset may be referred to as the triggering offset. The value set by aperiodicResourceOffset may be referred to as the resource offset. The value set by additionalOneSlotOffset or additionalOneSlotOffsetDoppler may be referred to as the additional offset or additional slot offset.

[0276] FIG. 4 is a conceptual diagram illustrating an example of a non-periodic channel measurement resource timeline and a non-periodic interference measurement resource timeline.

[0277] Referring to FIG. 4, a channel measurement resource (CMR) can be configured by aggregating two CSI-RS resources. In the embodiment of the first trigger, CSI-RS resource #0, which has no additional slot offset set, can be aggregated with CSI-RS resource #1, which has an additional slot offset set, and a CSI-IM resource (e.g., an interference measurement resource (IMR)) can follow the offset of CSI-RS resource #0, which has no additional slot offset set. In the embodiment of the second trigger, an additional slot offset may not be set for both CSI-RS resource #0 and CSI-RS resource #1, and a CSI-IM can follow the offsets of CSI-RS resource #0 and CSI-RS resource #1, which have no additional slot offset set. In the embodiments described above, the interval between the slot in which the triggering DCI requesting a non-periodic CSI report to the terminal is transmitted and the start slot of the aggregated CSI-RS (e.g., the first slot) can be set to aperiodicTriggeringOffset.

[0278] FIG. 5 is a conceptual diagram illustrating an example of a non-periodic channel measurement resource timeline and a non-periodic interference measurement resource timeline when a Doppler codebook is set.

[0279] Referring to FIG. 5, the channel measurement resources may be composed of four CSI-RS resource groups, and each CSI-RS resource group may be composed of two CSI-RS resources aggregated. CSI-RS resources #0, #2, #4, and #6 may be the first CSI-RS resources within each CSI-RS resource group. In other words, CSI-RS resources #0, #2, #4, and #6 may correspond to CSI-RS resource #0 within each CSI-RS resource group. CSI-RS resources #1, #3, #5, and #7 may be the second CSI-RS resources within each CSI-RS resource group. In other words, CSI-RS resources #1, #3, #5, and #7 may correspond to CSI-RS resource #1 within each CSI-RS resource group. An additional slot offset may not be set for the first CSI-RS resource within each CSI-RS resource group, and an additional slot offset may be set for the second CSI-RS resource. The CSI-IM resource may follow the offset of CSI-RS Resource #0, which is the first CSI-RS resource within the first CSI-RS resource group for which no additional slot offset is set. The interval between the slot in which the triggering DCI requesting a non-periodic CSI report to the terminal is transmitted and the start slot of the first CSI-RS resource group (e.g., the first slot) may be set by aperiodicTriggeringOffset. The interval between the start slots (e.g., the first slot) of each of consecutive CSI-RS resource groups may be set by aperiodicResourceOffset.

[0280] FIG. 6 is a conceptual diagram illustrating an example of a non-periodic channel measurement resource timeline and a non-periodic interference measurement resource timeline when a Doppler codebook is set.

[0281] Referring to FIG. 6, the channel measurement resources may be composed of four CSI-RS resource groups, and each CSI-RS resource group may be composed of two CSI-RS resources aggregated. For both the first and second CSI-RS resources within each CSI-RS resource group, no additional slot offset may be set, and the CSI-IM resources may follow the offsets of CSI-RS resource #0, the first CSI-RS resource within the first CSI-RS resource group where no additional slot offset is set, and CSI-RS resource #1, the second CSI-RS resource. The interval between the slot in which the triggering DCI requesting a non-periodic CSI report to the terminal is transmitted and the start slot of the first CSI-RS resource group (e.g., the first slot) may be set as aperiodicTriggeringOffset. The interval between the start slots (e.g., the first slot) of each of consecutive CSI-RS resource groups can be set by aperiodicResourceOffset.

[0282] The base station can transmit CSI configuration information to the terminal (S320). The terminal can receive the CSI configuration information from the base station (S320). The terminal can verify the information included in the CSI configuration information. The base station can transmit a DCI that triggers a CSI report to the terminal (S330). The DCI may include a CSI request field. The terminal can receive the DCI that triggers a CSI report from the base station (S330). The terminal can verify that a CSI report is triggered based on the CSI request field included in the DCI received from the base station. The DCI that triggers a CSI report may be referred to as a triggering DCI.

[0283] When a CSI report is triggered, the terminal can determine the location of the CSI-RS resource set and / or the CSI-IM resource set based on the CSI configuration information (S340). For example, the terminal can determine the slot where the CSI-RS resource set is located based on the triggering offset (aperiodicTriggeringOffset) included in the CSI configuration information. The triggering offset may be a slot offset between the slot where the triggering DCI was received and the slot where the CSI-RS resource set (e.g., the first CSI-RS resource group within the CSI-RS resource set) is located.

[0284] Based on the fact that the CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information included in the CSI configuration information indicates a Type-II Doppler codebook, the terminal can determine the slot where the CSI-IM resource set is located by using the triggering offset for the CSI-RS resource set. In other words, when a Type-II Doppler codebook is configured in the terminal, the triggering offset for the CSI-IM resource set may not be separately configured in the terminal, and the terminal can determine the location of the CSI-IM resource set based on the same triggering offset as the CSI-RS resource set. The triggering offset can be interpreted as a slot offset between the slot where the triggering DCI was received and the slot where the CSI-IM resource set is located.

[0285] The base station may transmit CSI-RS to the terminal based on CSI configuration information and / or triggering DCI (S350). CSI-RS may be transmitted from resources determined based on the transmission time (e.g., transmission slot) and triggering offset of the triggering DCI. In S360, the terminal may generate a first measurement result (e.g., channel information) based on the CSI-RS received from a CSI-RS resource belonging to a set of CSI-RS resources, generate a second measurement result (e.g., interference information) from a CSI-IM resource belonging to a set of CSI-IM resources, and generate a CSI report based on the first measurement result and the second measurement result (S360). The terminal may transmit the CSI report to the base station (S370). The base station may receive the CSI report from the terminal (S370). The base station may verify the information contained in the CSI report.

[0286] The operation of the method according to an embodiment of the present disclosure may be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes all types of recording devices in which information that can be read by a computer system is stored. Additionally, the computer-readable recording medium may be distributed across networked computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0287] In addition, computer-readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Program instructions may include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0288] Some aspects of the present disclosure have been described in the context of a device, but may also be described according to a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described according to a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one of the most important method steps may be performed by such a device.

[0289] In the embodiments, a programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described herein. In the embodiments, a field-programmable gate array may operate with a microprocessor to perform one of the methods described herein. Generally, it is preferable that the methods be performed by some hardware device.

[0290] Although the present disclosure has been described with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the following claims.

Claims

1. As a method of a terminal, A step of receiving CSI (channel state information) configuration information from a base station; A step of receiving DCI (downlink control information) from the base station that triggers a CSI report; A step of determining the location of a CSI-RS (resource) resource set based on the triggering offset included in the above CSI setting information; A step of determining the location of a CSI-IM (interference measurement) resource set based on the same triggering offset as the above CSI-RS resource set; A step of generating a CSI based on a first measurement result in a CSI-RS resource belonging to the above CSI-RS resource set and a second measurement result in a CSI-IM resource belonging to the above CSI-IM resource set; and A step comprising transmitting the CSI report including the above CSI to the base station, Method of the terminal.

2. In Claim 1, Based on the fact that the above CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the location of the above CSI-IM resource set is determined based on the triggering offset set for the above CSI-RS resource set, and a separate triggering offset for the above CSI-IM resource set is not set on the terminal, Method of the terminal.

3. In Claim 1, Based on the fact that the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the above CSI-RS resource set is configured to include a plurality of CSI-RS resource groups, and each of the plurality of CSI-RS resource groups is configured to include one or more CSI-RS resources, and information indicating the number of the plurality of CSI-RS resource groups is included in the above CSI setting information. Method of the terminal.

4. In Claim 1, Based on the fact that the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the second measurement result in the above CSI-IM resource is included in the above CSI report, Method of the terminal.

5. In Claim 1, At least one CSI-RS resource belonging to the above CSI-RS resource set and at least one CSI-IM resource belonging to the above CSI-IM resource set are located within the same slot. Method of the terminal.

6. In Claim 1, The above triggering offset is a slot offset between the slot where the DCI is received and the slot where the CSI-RS resource set is located, Method of the terminal.

7. In Claim 1, The location of at least one CSI-RS resource belonging to the above CSI-RS resource set is determined based on the triggering offset and additional offset, and the information of the additional offset is included in the CSI setting information. Method of the terminal.

8. In Claim 1, At least one of QCL (quasi co-location) information, power control offset, or SSB (synchronization signal block) reference power control offset is configured to be commonly applied to all CSI-RS resources belonging to the set of CSI-RS resources, Method of the terminal.

9. As a method of base stations, A step of transmitting CSI configuration information to a terminal, including information on a CSI (channel state information)-RS (reference signal) resource set, information on a CSI-IM (interference measurement) resource set, a triggering offset, and codebook information; A step of transmitting downlink control information (DCI) that triggers a CSI report to the terminal; A step of transmitting CSI-RS to the terminal from one or more CSI-RS resources belonging to the set of CSI-RS resources at a location based on the triggering offset; and The method includes the step of receiving from the terminal a CSI report comprising a CSI generated based on a first measurement result in one or more CSI-RS resources and a second measurement result in a CSI-IM resource belonging to the set of CSI-IM resources. The location of the above CSI-IM resource set is set based on the same triggering offset as the above CSI-RS resource set, Base station method.

10. In Claim 9, Based on the fact that the above CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information is set as a Type-II Doppler codebook, the location of the above CSI-IM resource set is set based on the triggering offset set for the above CSI-RS resource set, and a separate triggering offset for the above CSI-IM resource set is not set on the terminal, Base station method.

11. In Claim 9, Based on the fact that the above codebook information is set as a Type-II Doppler codebook, the above CSI-RS resource set is configured to include a plurality of CSI-RS resource groups, and each of the plurality of CSI-RS resource groups is configured to include one or more CSI-RS resources, and information indicating the number of the plurality of CSI-RS resource groups is included in the above CSI setting information. Base station method.

12. In Claim 9, Based on the fact that the above codebook information is set to a Type-II Doppler codebook, the above second measurement result in the above CSI-IM resource is included in the above CSI report, Base station method.

13. In Claim 9, At least one CSI-RS resource belonging to the above CSI-RS resource set and at least one CSI-IM resource belonging to the above CSI-IM resource set are located within the same slot. Base station method.

14. In Claim 9, The above triggering offset is a slot offset between the slot where the DCI is transmitted and the slot where the CSI-RS resource set is located, Base station method.

15. In Claim 9, The location of at least one CSI-RS resource belonging to the above CSI-RS resource set is determined based on the triggering offset and additional offset, and the information of the additional offset is included in the CSI setting information. Base station method.

16. In Claim 9, At least one of QCL (quasi co-location) information, power control offset, or SSB (synchronization signal block) reference power control offset is configured to be commonly applied to all CSI-RS resources belonging to the set of CSI-RS resources, Base station method.

17. As a terminal, It includes at least one processor, The above at least one processor is the terminal, Receive CSI (channel state information) configuration information from the base station; Receive DCI (downlink control information) from the base station that triggers a CSI report; Determining the location of the CSI-RS(resource) resource set based on the triggering offset included in the above CSI setting information; Determining the location of the CSI-IM (interference measurement) resource set based on the same triggering offset as the above CSI-RS resource set; Generating a CSI based on a first measurement result from a CSI-RS resource belonging to the above CSI-RS resource set and a second measurement result from a CSI-IM resource belonging to the above CSI-IM resource set; and Causing the transmission of the CSI report including the above CSI to the base station, Terminal.

18. In Claim 17, Based on the fact that the above CSI-RS resource set is a non-periodic CSI-RS resource set and the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the location of the above CSI-IM resource set is determined based on the triggering offset set for the above CSI-RS resource set, and a separate triggering offset for the above CSI-IM resource set is not set on the terminal, Terminal.

19. In Claim 17, Based on the fact that the codebook information included in the above CSI setting information is set as a Type-II Doppler codebook, the above CSI-RS resource set is configured to include a plurality of CSI-RS resource groups, and each of the plurality of CSI-RS resource groups is configured to include one or more CSI-RS resources, and information indicating the number of the plurality of CSI-RS resource groups is included in the above CSI setting information. Terminal.

20. In Claim 17, At least one of QCL (quasi co-location) information, power control offset, or SSB (synchronization signal block) reference power control offset is configured to be commonly applied to all CSI-RS resources belonging to the set of CSI-RS resources, Terminal.

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