Apparatus and method for reporting channel status information based on sub-configurations in a wireless communication system

Abstract

This disclosure relates to reporting channel state information (CSI) based on sub-configurations in a wireless communication system, and the method performed by a terminal includes the steps of: receiving configuration information for a channel state information (CSI) report including at least one sub-configuration; verifying information related to an antenna port subset associated with the at least one sub-configuration; generating a CSI for the at least one sub-configuration based on measurement results based on at least one CSI-RS associated with the CSI report; and transmitting a CSI report including the CSI to a base station.

Description

Technical Field

[0001] The following description relates to a wireless communication system, and more particularly, to an apparatus and method for reporting CSI (channel state information) based on sub-configurations in a wireless communication system.

Background Art

[0002] Wireless connection systems are widely deployed to provide various communication services such as voice and data. In general, a wireless connection system is a multiple access system that can support communication with multiple users by sharing available system resources (such as bandwidth and transmission power). Examples of multiple access systems include CDMA (code division multiple access) systems, FDMA (frequency division multiple access) systems, TDMA (time division multiple access) systems, OFDMA (orthogonal frequency division multiple access) systems, SC-FDMA (single carrier frequency division multiple access) systems, and the like.

[0003] Particularly, as many communication devices require a large communication capacity, enhanced mobile broadband (eMBB) communication technologies have been proposed, which are more advanced than existing radio access technologies (RATs). In addition, communication systems have been proposed that take into account mMTC (massive machine type communications), which connects a large number of devices and things to provide various services anytime and anywhere, as well as reliability and latency-sensitive services / UEs (user equipment). Various technical configurations have been proposed for this purpose.

Summary of the Invention

[0004] This disclosure relates to an apparatus and method for effectively reporting channel state information (CSI) based on sub-configurations in a wireless communication system.

[0005] This disclosure relates to an apparatus and method for specifying a subset of antenna ports (APs) in a wireless communication system.

[0006] This disclosure relates to an apparatus and method for reporting CSI based on an AP subset of subconfigurations in a wireless communication system.

[0007] This disclosure relates to an apparatus and method for determining AP subsets in a wireless communication system, taking into account CDM (code division multiplexing) groups.

[0008] This disclosure relates to an apparatus and method for turning APs on and off in CDM group units in a wireless communication system.

[0009] This disclosure relates to an apparatus and method for assigning AP indices in a wireless communication system, taking into account the on / off status of CDM groups.

[0010] This disclosure relates to an apparatus and method for allocating AP indices in a wireless communication system with priority given to frequency resources or time resources.

[0011] This disclosure relates to an apparatus and method for selecting a codebook for a subset of APs in a wireless communication system.

[0012] This disclosure relates to an apparatus and method for mapping AP indices to a subset of APs in a subconfiguration of a wireless communication system.

[0013] This disclosure relates to an apparatus and method for mapping a continuous index to APs of a subset of APs in a subconfiguration in a wireless communication system.

[0014] The technical objectives to be achieved in this disclosure are not limited to those mentioned above, and other technical challenges not mentioned can be considered by a person of ordinary skill in the art to which the technical configuration of this disclosure applies, based on the embodiments of this disclosure described below. [Means for solving the problem]

[0015] As an example of the present disclosure, a method performed by a terminal in a wireless communication system includes the steps of: receiving configuration information for a channel state information (CSI) report including (having; configuring; constructing; setting; encompassing; including; containing; having) at least one sub-configuration; verifying information related to an antenna port subset associated with the at least one sub-configuration; generating a CSI for the at least one sub-configuration based on measurement results based on at least one CSI-RS associated with the CSI report; and transmitting a CSI report including the CSI to a base station, wherein the CSI includes a precoding matrix indicator (PMI), the PMI is determined based on an antenna port index mapped to an antenna port included in the antenna port subset, the antenna port index is determined by mapping the antenna ports to a continuous value starting from the index's starting value in ascending order of index within the overall set.

[0016] As an example of the present disclosure, a terminal in a wireless communication system includes a transceiver and a processor connected to the transceiver, wherein the processor is configured to receive configuration information for a channel state information (CSI) report including at least one sub-configuration, verify information related to an antenna port subset associated with the at least one sub-configuration, generate a CSI for the at least one sub-configuration based on measurement results based on at least one CSI-RS associated with the CSI report, and transmit a CSI report including the CSI to a base station, wherein the CSI includes a precoding matrix indicator (PMI), the PMI is determined based on an antenna port index mapped to an antenna port included in the antenna port subset, the antenna port index is determined by mapping the antenna ports to a continuous value starting from the index's starting value in ascending order of index within the overall set.

[0017] As an example of the present disclosure, a communication device includes at least one processor and at least one computer memory connected to the at least one processor and storing instruction words that instruct an operation to be executed by the at least one processor, wherein the operation includes the steps of receiving configuration information for a channel state information (CSI) report including at least one sub-configuration, verifying information related to an antenna port subset associated with the at least one sub-configuration, generating a CSI for the at least one sub-configuration based on measurement results based on at least one CSI-RS associated with the CSI report, and transmitting a CSI report including the CSI to a base station, wherein the CSI includes a precoding matrix indicator (PMI), the PMI is determined based on an antenna port index mapped to an antenna port included in the antenna port subset, the antenna port index is determined by mapping the antenna ports to a continuous value starting from the index's starting value in ascending order of index within the overall set.

[0018] As an example of the present disclosure, a non-transitory computer-readable medium for storing at least one instruction includes the processor-executable at least one instruction, which instructs the device to receive configuration information for a channel state information (CSI) report including at least one sub-configuration, verify information related to an antenna port subset associated with the at least one sub-configuration, generate a CSI for the at least one sub-configuration based on measurement results based on at least one CSI-RS associated with the CSI report, and transmit the CSI report including the CSI to a base station, wherein the CSI includes a precoding matrix indicator (PMI), which is determined based on an antenna port index mapped to an antenna port included in the antenna port subset, which is determined by mapping the antenna ports to a continuous value starting from the index's starting value in ascending order of index within the overall set.

[0019] The aspects of the Disclosure described herein represent only a selection of preferred embodiments of the Disclosure, and a variety of embodiments reflecting the technical features of the Disclosure can be derived and understood by a person ordinary in the art based on the detailed description of the Disclosure described below. [Effects of the Invention]

[0020] The embodiments based on this disclosure will produce the following effects.

[0021] According to this disclosure, channel state information (CSI) feedback for a subset of antenna ports can be performed using an existing codebook.

[0022] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those with ordinary knowledge in the technical field to which the technical configuration of the present disclosure is applied from the descriptions of the embodiments of the present disclosure below. That is, unintended effects caused by implementing the configurations described in the present disclosure can also be derived by those with ordinary knowledge in the technical field from the embodiments of the present disclosure.

Brief Description of the Drawings

[0023] [Figure 1] It is a diagram illustrating the structure of a wireless communication system to which the present disclosure is applicable. [Figure 2] It is a diagram showing an example of a wireless device to which the present disclosure is applicable. [Figure 3] It is a diagram illustrating the frame structure in a wireless communication system to which the present disclosure is applicable. [Figure 4] It illustrates a resource grid in a wireless communication system to which the present disclosure is applicable. [Figure 5] It illustrates a physical resource block in a wireless communication system to which the present disclosure is applicable. [Figure 6] It illustrates the slot structure in a wireless communication system to which the present disclosure is applicable. [Figure 7] It illustrates physical channels (channels) used in a wireless communication system to which the present disclosure is applicable and a general signal transmission / reception method using these channels. [Figure 8] It shows an example in which physical channels in a slot are mapped in a wireless communication system to which the present disclosure is applicable. [Figure 9] It shows an example of a beam to which the present disclosure is applicable. [Figure 10]This disclosure provides an example of a DL BM (downlink beam management) procedure using an SSB (synchronization signal block) that can be applied to this disclosure. [Figure 11] This disclosure provides an example of a DL BM procedure using CSI (channel state information)-RS (reference signal) that can be applied to this disclosure. [Figure 12] This disclosure provides an example of a terminal receiving beam determination procedure that may be applied to this disclosure. [Figure 13] This disclosure provides an example of a base station transmit beam determination procedure that may be applied to this disclosure. [Figure 14] Examples of resource allocation in the time and frequency domains that may be applied to this disclosure are shown. [Figure 15] This disclosure provides an example of beam sweeping for UL BM (uplink beam management) using a sounding reference signal (SRS), which can be applied to this disclosure. [Figure 16] This disclosure provides an example of an SRS-based UL BM procedure that can be applied to this disclosure. [Figure 17] This disclosure provides an example of the operating procedure for a base station supporting network energy saving (NES) technology that can be applied to this disclosure. [Figure 18] Examples of procedures for CSI measurement and reporting that may be applied to this disclosure are provided. [Figures 19a-19c] An example of the state of an antenna element according to one embodiment of this disclosure is shown. [Figure 20] Examples of configuration information for CSI reporting related to various embodiments of this disclosure are shown. [Figures 21a-21r] This disclosure shows examples of CSI-RS (reference signal) AP (antenna port) mapping using various patterns applicable to this disclosure. [Figure 22]This disclosure provides an example of a port layout for configuring a MIMO (multipe input multiput output) codebook applicable to this disclosure. [Figures 23a-23m] Examples of port layouts using various combinations of N1 and N2 applicable to this disclosure are shown. [Figures 24a-24h] Examples of port layouts using various combinations of Ng, N1, and N2 applicable to this disclosure are shown. [Figures 25a-25b] Examples of port layouts for 8-port APs and variations of port layouts for AP subsets applicable to this disclosure are shown. [Figure 26] One embodiment of this disclosure provides an example of a procedure for reporting CSI for sub-configuration. [Figure 27] One embodiment of this disclosure provides an example of a procedure for receiving a CSI for sub-configuration. [Figures 28a-28b] This disclosure provides an example of AP mapping for CSI-RS based on CDM (code domain multiplexing) group-specific on / off settings according to one embodiment of this disclosure. [Figures 29a-29b] This disclosure shows an example of CSI-RS AP mapping and a resulting port layout based on frequency domain and time domain priority allocation according to one embodiment of this disclosure. [Figures 30a-30c] An example of the re-indexing result of an AP according to one embodiment of this disclosure is shown. [Figure 31] One embodiment of this disclosure provides an example of a procedure for mapping APs based on a subset of APs in a sub-configuration. [Figure 32] One embodiment of this disclosure provides an example of a procedure for sending a CSI report based on sub-configurations. [Modes for carrying out the invention]

[0024] The following embodiments combine the components and features of the Disclosure in a predetermined form. Each component or feature can be considered optional unless otherwise expressly mentioned. Each component or feature can be implemented in a form not combined with other components or features. Alternatively, some components and / or features can be combined to constitute embodiments of the Disclosure. The order of operations described in the embodiments of the Disclosure may be changed. Some components or features of any embodiment may be included in other embodiments, or may be replaced with corresponding components or features of other embodiments.

[0025] In describing the drawings, we have not included any procedures or steps that may obscure the gist of this disclosure, nor have we included any procedures or steps that would be understandable to a person skilled in the art.

[0026] Throughout the specification, when a part "comprising or including" a component, this means, unless otherwise stated, that it may include other components rather than excluding them. Furthermore, terms such as "...part," "...unit," and "module" as used in the specification mean a unit that performs at least one function or operation, which can be realized in hardware, software, or a combination of hardware and software. Also, "a or an," "one," "the," and similar related terms can be used in both singular and plural senses in the context describing this disclosure (particularly in the context of the following claims), unless otherwise indicated herein or explicitly refuted by the context.

[0027] In this specification, embodiments of the present disclosure have been described primarily in relation to the data transmission and reception relationship between a base station and a mobile station. Here, a base station refers to a terminal node of a network that communicates directly with a mobile station. Certain operations described herein as being performed by a base station may, in some cases, be performed by an upper node of the base station.

[0028] In other words, in a network consisting of multiple network nodes, including a base station, various operations performed for communication with a mobile station can be carried out by the base station or other network nodes. In this case, "base station" can be replaced with terms such as fixed station, Node B, eNB (eNode B), gNB (gNode B), ng-eNB, advanced base station (ABS), or access point.

[0029] Furthermore, in the embodiments of this disclosure, the term "terminal" may be replaced with terms such as user equipment (UE), mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, or advanced mobile station (AMS).

[0030] Furthermore, the transmitting end refers to a fixed and / or mobile node providing data or voice services, and the receiving end refers to a fixed and / or mobile node receiving data or voice services. Therefore, in the case of an uplink, a mobile station can be the transmitting end and a base station can be the receiving end. Similarly, in the case of a downlink, a mobile station can be the receiving end and a base station can be the transmitting end.

[0031] The embodiments of this disclosure can be supported by standard documents disclosed in at least one of the following wireless connectivity systems: IEEE 802.xx systems, 3GPP (3rd Generation Partnership Project: registered trademark; hereinafter the same) systems, 3GPP LTE (Long Term Evolution) systems, 3GPP 5G (5th generation) NR (New Radio) systems, and 3GPP2 systems. In particular, the embodiments of this disclosure can be supported by 3GPP TS (technical specification) 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321, and 3GPP TS 38.331 documents.

[0032] Furthermore, the embodiments of this disclosure can be applied to other wireless connectivity systems and are not limited to the systems described above. For example, they can be applied to systems subsequently applied to 3GPP 5G NR systems and are not limited to any particular system.

[0033] In other words, any obvious steps or parts of the embodiments of this disclosure that are not described can be explained by referring to the above-mentioned documents. Furthermore, all terms disclosed herein can be explained by the aforementioned standard documents.

[0034] Preferred embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to illustrate exemplary embodiments of this disclosure and is not intended to show only the few embodiments in which the technical configuration of this disclosure can be implemented.

[0035] Furthermore, certain terms used in the embodiments of this disclosure are provided for the purpose of aiding the understanding of this disclosure, and the use of such specific terms may be modified in other ways, provided that they do not deviate from the technical idea of ​​this disclosure.

[0036] The following technologies can be applied to various wireless connectivity systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access).

[0037] For the sake of clarity, the following explanation will be based on 3GPP communication systems (e.g., LTE, NR, etc.), but the technical concepts of this disclosure are not limited thereto. LTE may refer to 3GPP TS 36.xxx Release 8 or later technologies. More specifically, LTE technologies from 3GPP TS 36.xxx Release 10 onwards are sometimes called LTE-A, and LTE technologies from 3GPP TS 36.xxx Release 13 onwards are sometimes called LTE-A pro. 3GPP NR may refer to TS 38.xxx Release 15 or later technologies. 3GPP 6G may refer to TS Release 17 and / or Release 18 or later technologies. "xxx" refers to the specification number of the standard document. LTE / NR / 6G may be referred to as 3GPP systems.

[0038] 3GPP 6G can refer to technologies based on the 3GPP system that are post-3GPP NR. 3GPP 6G is not limited to Releases or specific TS documents, and its name may differ from 3GPP 6G. In other words, 3GPP 6G can refer to technologies introduced after 3GPP NR, and is not limited to a specific form.

[0039] The following discussion will focus primarily on the 3GPP NR system, but will not be limited to it; it is also applicable to 3GPP 6G. Furthermore, the matters described below can be modified and used in consideration of the 3GPP 6G system, and are not limited to any particular form. However, for the sake of clarity, the following discussion will focus primarily on the 3GPP NR system. For background information, terminology, abbreviations, etc., used in this disclosure, refer to the standards documents published prior to this disclosure. For example, refer to the 36.xxx and 38.xxx standards documents.

[0040] General System

[0041] As more communication devices demand greater communication capacity, the need for improved mobile broadband communication compared to existing radio access technology (RAT) is emerging. Massive Machine Type Communications (MTC), which connects numerous devices and things to provide various services anytime, anywhere, is also a major issue being considered in next-generation communications. Furthermore, communication system design that takes into account reliability and latency-sensitive services / terminals is being discussed. Thus, the introduction of next-generation RATs that consider eMBB (enhanced mobile broadband communication), mMTC (massive MTC), URLLC (Ultra-Reliable and Low Latency Communication), etc., is being discussed, and for convenience, this disclosure refers to such technologies as NR. NR is an expression that represents an example of 5G RAT.

[0042] The new RAT system, including NR, uses the OFDM transmission method or a similar transmission method. The new RAT system can follow OFDM parameters different from those of LTE. Alternatively, the new RAT system can follow the existing LTE / LTE-A numerology but support a larger system bandwidth (e.g., 100 MHz). Alternatively, a single cell can support multiple numerologies; that is, terminals operating with different numerologies can coexist within a single cell.

[0043] A numerology corresponds to a single subcarrier spacing in the frequency domain. Different numerologies can be defined by scaling the reference subcarrier spacing by an integer N.

[0044] Furthermore, new RAT systems, including 6G, can be considered as next-generation RATs. These new RAT systems, including 6G, may, but are not limited to, i) extremely high data rates per device, ii) a very large number of connected devices, iii) global connectivity, iv) very low latency, v) low energy consumption for battery-free IoT devices, vi) ultra-high reliability connectivity, and vii) connected intelligence with machine learning capabilities. Taking the aforementioned aspects into account, new RAT systems, including 6G, may consider using the THz (Terahertz) frequency band at higher frequencies than NR systems for wider bandwidth and higher transmission speeds. New RAT systems, including 6G, may, but are not limited to, applying AI / ML (artificial intelligence / machine learning) to overcome existing limitations.

[0045] Figure 1 illustrates the structure of a wireless communication system to which this disclosure can be applied. Referring to Figure 1, the NG-RAN consists of the NG-RA (NG-Radio Access) user plane (i.e., the new AS (access stratum) sublayer / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC / PHY) and a gNB that provides control plane (RRC) protocol termination to the UE. The gNBs are interconnected via the Xn interface. The gNBs are also connected to the NGC (New Generation Core) via the NG interface. More specifically, the gNBs are connected to the AMF (Access and Mobility Management Function) via the N2 interface and to the UPF (User Plane Function) via the N3 interface. Figure 1 is a structure based on an NR system, and in a 6G system, the structure of Figure 1 may be used identically or with some modifications, and is not limited to a particular form.

[0046] Figure 2 shows an example of a wireless device applicable to this disclosure.

[0047] Referring to Figure 2, the wireless device 200 can transmit and receive wireless signals via various wireless connectivity technologies (e.g., LTE, LTE-A, LTE-A pro, NR, 5G, 5G-A, 6G). The wireless device 200 includes at least one processor 202 and at least one memory 204, and may further include at least one transceiver 206 and / or at least one antenna 208.

[0048] The processor 202 can be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. For example, the processor 202 can process information in the memory 204 to generate first information / signals, and then transmit a radio signal containing the first information / signals via the transceiver 206. Alternatively, the processor 202 can receive a radio signal containing second information / signals via the transceiver 206, and then store information obtained from signal processing of the second information / signals in the memory 204. The memory 204 can be connected to the processor 202 and can store various information relating to the operation of the processor 202. For example, the memory 204 can store software code containing instructions for performing some or all of the processes controlled by the processor 202, or for performing the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology. The transceiver 206 can be connected to the processor 202 and can transmit and / or receive radio signals via at least one antenna 208. The transceiver 206 may include a transmitter and / or receiver. The transceiver 206 can be used in combination with an RF (radio frequency) unit. In this disclosure, the term "wireless device" may also mean a communication modem / circuit / chip.

[0049] The hardware elements of the wireless device 200 will be described in more detail below. While not limited to these, at least one protocol layer can be implemented by at least one processor 202. For example, at least one processor 202 can implement at least one layer (e.g., a functional layer such as PHY (physical), MAC (media access control), RLC (radio link control), PDCP (packet data convergence protocol), RRC (radio resource control), SDAP (service data adaptation protocol)). At least one processor 202 can generate at least one PDU (Protocol Data Unit) and / or at least one SDU (service data unit) according to the descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed herein. At least one processor 202 can generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed herein. At least one processor 202 can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information in accordance with the functions, procedures, suggestions and / or methods disclosed herein and provide them to at least one transceiver 206. At least one processor 202 can receive signals (e.g., baseband signals) from at least one transceiver 206 and acquire PDUs, SDUs, messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein.

[0050] At least one processor 202 is also called a controller, microcontroller, microprocessor, or microcomputer. At least one processor 202 can be implemented by hardware, firmware, software, or a combination thereof. As an example, at least one ASIC (application specific integrated circuit), at least one DSP (digital signal processor), at least one DSPD (digital signal processing device), at least one PLD (programmable logic device), or at least one FPGA (field programmable gate arrays) may be included in at least one processor 202. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein may be included in at least one processor 202 or stored in at least one memory 204 and driven by at least one processor 202. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of code, commands and / or sets of commands.

[0051] At least one memory 204 can be connected to at least one processor 202 and can store data, signals, messages, information, programs, code, instructions and / or commands in various forms. At least one memory 204 can consist of ROM (read-only memory), RAM (random access memory), EPROM (erasable programmable read-only memory), flash memory, hard drive, registers, cache memory, computer-readable storage media, and / or a combination thereof. At least one memory 204 can be located inside and / or outside at least one processor 202. Furthermore, at least one memory 204 can be connected to at least one processor 202 via various technologies such as wired or wireless connections.

[0052] At least one transceiver 206 can transmit user data, control information, radio signals / channels, etc., as described in the methods and / or operation flowcharts of this specification, to at least one other device. At least one transceiver 206 can receive user data, control information, radio signals / channels, etc., as described in the descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed herein, from at least one other device. For example, at least one transceiver 206 can be connected to at least one processor 202 and can transmit and receive radio signals. For example, at least one processor 202 can control at least one transceiver 206 to transmit user data, control information, or radio signals to at least one other device. Also, at least one processor 202 can control at least one transceiver 206 to receive user data, control information, or radio signals from at least one other device. Furthermore, at least one transceiver 206 can be connected to at least one antenna 208, and at least one transceiver 206 can be configured to send and receive user data, control information, radio signals / channels, etc., as described herein in the descriptions, functions, procedures, suggestions, methods and / or operation flowcharts, etc. In this specification, at least one antenna may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). At least one transceiver 206 can convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing using at least one processor 202. At least one transceiver 206 can convert the user data, control information, radio signals / channels, etc., processed by at least one processor 202, from baseband signals to RF band signals. For this purpose, at least one transceiver 206 may include an (analog) oscillator and / or a filter.

[0053] The components of the wireless device described with reference to Figure 2 may be referred to by other terms from a functional standpoint. For example, the processor 202 may be called the control unit, the transceiver 206 the communication unit, and the memory 204 the storage unit. Depending on the context, the term "communication unit" may be used to include at least a portion of the processor 202 and the transceiver 206.

[0054] The structure of the wireless device described with reference to Figure 2 can be understood as the structure of at least a part of various devices. For example, it is at least a part of various devices (e.g., robots, vehicles, XR devices, mobile devices, home appliances, IoT devices, AI devices / servers, etc.). Furthermore, depending on the various embodiments, the device may further include other components in addition to the components illustrated in Figure 2.

[0055] For example, the device may be a portable device such as a smartphone, smart pad, wearable device (e.g., smartwatch, smart glasses), or portable computer (e.g., laptop computer). In this case, the device may further include at least one of the following: a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; an interface unit that includes at least one port for connection with other devices (e.g., an audio input / output port, a video input / output port); and an input / output unit for inputting and outputting image information / signals, audio information / signals, data, and / or information input from the user.

[0056] For example, the device may be a mobile robot, vehicle, train, aerial vehicle (AV), ship, or other mobile device. In this case, the device may further include a drive unit including at least one of the device's engine, motor, powertrain, wheels, brakes, and steering device; a power supply unit that supplies power and includes a wired / wireless charging circuit, battery, etc.; a sensor unit that detects status information, environmental information, and user information of the device or its surroundings; an autonomous driving unit that performs functions such as route keeping, speed adjustment, and destination setting; and a position measurement unit that acquires position information of the mobile device via GPS (global positioning system) and various sensors.

[0057] For example, the device is an XR device such as an HMD, a HUD (head-up display) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, or a robot. In this case, the device may further include at least one of the following: a power supply unit that supplies power and includes wired / wireless charging circuits and a battery; an input / output unit that acquires control information, data, etc. from the outside and outputs generated XR objects; and a sensor unit that detects status information, environmental information, and user information of the device or its surroundings.

[0058] For example, the device is a robot that can be classified as industrial, medical, household, military, etc., depending on its intended use and field. In this case, the device may further include at least one of the following: a sensor unit that detects status information, environmental information, and user information of the device or its surroundings; and a drive unit that performs various physical actions such as moving robot joints.

[0059] For example, the devices are AI devices such as televisions, projectors, smartphones, PCs, laptops, digital broadcasting terminals, tablet PCs, wearable devices, set-top boxes (STBs), radios, washing machines, refrigerators, digital signage, robots, and vehicles. In this case, the device may further include at least one of the following: an input unit that acquires various types of data from the outside; an output unit that generates outputs related to vision, hearing, or touch; a sensor unit that detects state information, environmental information, and user information of the device or its surroundings; and a training unit that learns a model composed of an artificial neural network using training data. The structure of the wireless device illustrated in Figure 2 can be understood as part of a RAN node (e.g., base station, DU, RU, RRH, etc.). That is, the device illustrated in Figure 2 may be a RAN node. In this case, the device may further include wired transceivers for front haul and / or back haul communication. However, if the fronthaul and / or backhaul communication is based on wireless communication, at least one transceiver 206 as illustrated in Figure 2 may be used for the fronthaul and / or backhaul communication, and a wired transceiver may not be included.

[0060] Figure 3 illustrates a frame structure in a wireless communication system to which this disclosure can be applied.

[0061] The NR system can support a number of numerologies, which can be defined by subcarrier spacing and cyclic prefix (CP) overhead. These numerous subcarrier spacings can be derived by scaling the fundamental (reference) subcarrier spacing by an integer N (or μ). Furthermore, even assuming that very low subcarrier spacings are not used at very high carrier frequencies, the numerology used can be selected independently of the frequency band. The NR system can also support various frame structures based on these numerous numerologies.

[0062] The following describes the OFDM numerology and frame structures that can be considered in the NR system. The numerous OFDM numerologies supported by the NR system can be defined as shown in Table 1 below.

[0063] [Table 1]

[0064] NR supports numerous numerologies (or subcarrier spacings (SCS)) to support various 5G services. For example, an SCS of 15kHz supports wide area in the traditional cellular band; an SCS of 30kHz / 60kHz supports dense-urban areas, lower latency, and wider carrier bandwidth; and an SCS of 60kHz or higher supports bandwidths wider than 24.25GHz to overcome phase noise. The NR frequency band is defined by two types of frequency ranges (FR1, FR2). FR1 and FR2 can be configured as shown in Table 2 below. Also, FR2 can mean millimeter wave (mmW).

[0065] [Table 2]

[0066] JPEG2026513927000004.jpg180169

[0067] [Table 3]

[0068] [Table 4]

[0069] Figure 3 shows an example where μ=2 (SCS is 60kHz). Referring to Table 3, one subframe can contain four slots. The one subframe = {1,2,4} slots shown in Figure 3 is just an example, and the number of slots that can be included in one subframe is defined as shown in Table 3 or Table 4. Also, a mini-slot may contain 2, 4, or 7 symbols, or even more or fewer symbols. In relation to physical resources in an NR system, we can consider antenna ports, resource grids, resource elements, resource blocks, and carrier parts. The following describes in detail the physical resources that can be considered in an NR system. First, regarding antenna ports, an antenna port is defined so that the channel on which symbols on the antenna port are carried can be inferred from the channels on which other symbols on the same antenna port are carried. If the large-scale property of a channel carrying symbols on one antenna port can be inferred from the channel carrying symbols on another antenna port, then the two antenna ports can be said to be in a QC / QCL (quasi co-located or quasi co-location) relationship. Here, the large-scale property includes one or more of the following: delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0070] In 6G systems, communication can be performed at terahertz frequencies, which are higher than millimeter waves (mmW), and a frame structure similar to that in Figure 3 can be used, or a separate frame structure for 6G systems can be used; it is not limited to a specific form.

[0071] Figure 4 illustrates a resource grid in a wireless communication system to which this disclosure can be applied.

[0072] JPEG2026513927000007.jpg155170

[0073] Point A serves as the common reference point for the resource block grid and is obtained as follows:

[0074] - The offsetToPointA for the primary cell (PCell) downlink indicates the frequency offset between the lowest subcarrier of the lowest resource block overlapping with the SSB used by the terminal for initial cell selection and point A. It is expressed in resource block units, assuming a subcarrier spacing of 15 kHz for FR1 and 60 kHz for FR2.

[0075] -absoluteFrequencyPointA indicates the frequency-position of point A, expressed as ARFCN (absolute radio-frequency channel number).

[0076] JPEG2026513927000008.jpg33155

[0077]

number

[0078] JPEG2026513927000010.jpg42169

[0079]

number

[0080] JPEG2026513927000012.jpg17169

[0081] Figure 5 illustrates a physical resource block in a wireless communication system to which this disclosure can be applied. Figure 6 illustrates a slot structure in a wireless communication system to which this disclosure can be applied.

[0082] Referring to Figures 5 and 6, a slot contains multiple symbols in the time domain. For example, in a normal CP, one slot contains seven symbols, but in an extended CP, one slot contains six symbols.

[0083] A carrier wave contains multiple subcarriers in the frequency domain. An RB (Resource Block) is defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. A BWP (Bandwidth Part) is defined by multiple consecutive (physical) resource blocks in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier wave can contain up to N (e.g., 5) BWPs. Data communication occurs via activated BWPs, and only one BWP can be activated per terminal. In a resource grid, each element is called a Resource Element (RE) and can be mapped to one complex number symbol.

[0084] NR systems can support up to 400 MHz per component carrier (CC). If a terminal operating on such a wideband CC keeps its radio frequency (RF) chip on for the entire CC at all times, it can consume a significant amount of battery power. Alternatively, when considering various use cases operating within a single wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different numerologies (e.g., subcarrier spacing) may be supported for each frequency band within that CC. Or, different terminals may have different capabilities for the maximum bandwidth. To address this, a base station can instruct terminals to operate on only a portion of the wideband CC's bandwidth, rather than the entire bandwidth, and this portion of the bandwidth is conveniently defined as a bandwidth part (BWP). A BWP can consist of consecutive RBs on the frequency axis and can correspond to a single numerology (e.g., subcarrier spacing, CP length, slot / minislot interval).

[0085] On the other hand, a base station can configure multiple BWPs within a single CC configured on a terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency range can be configured, and the PDSCH indicated by the PDCCH can be scheduled on a larger BWP. Alternatively, if UEs are concentrated on a particular BWP, some terminals can be configured on other BWPs for load balancing. Or, considering frequency domain inter-cell interference cancellation between adjacent cells, a portion of the central spectrum of the entire bandwidth can be excluded, and BWPs on both sides can be configured within the same slot. In other words, a base station can configure at least one DL / UL BWP on terminals associated with a broadband CC. A base station can activate at least one DL / UL BWP among those configured at a particular time (by L1 signaling, MAC CE (control element), or RRC signaling, etc.). Furthermore, the base station can instruct switching to another configured DL / UL BWP (by L1 signaling, MAC CE, or RRC signaling, etc.). Alternatively, it can switch to a configured DL / UL BWP on a timer basis when the timer value expires. In this case, the activated DL / UL BWP is defined as the active DL / UL BWP. However, in situations such as when the terminal is performing the initial access process or before the RRC connection is set up, the configuration for the DL / UL BWP may not be received. In such situations, the DL / UL BWP assumed by the terminal is defined as the initially active DL / UL BWP.

[0086] Figure 7 illustrates physical channels used in wireless communication systems to which this disclosure can be applied, and typical signal transmission and reception methods using them.

[0087] In wireless communication systems, terminals receive information from base stations via the downlink and transmit information to base stations via the uplink. The information transmitted and received between base stations and terminals includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

[0088] When a terminal is powered on or enters a new cell, it performs initial cell search operations, such as synchronizing with the base station (S701). Therefore, the terminal receives the Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) from the base station to synchronize with it and obtain information such as the cell identifier (ID). Subsequently, the terminal receives the Physical Broadcast Channel (PBCH) from the base station to obtain broadcast information within the cell. Meanwhile, during the initial cell search phase, the terminal receives the Downlink Reference Signal (DL RS) to check the downlink channel status.

[0089] After completing the initial cell search, the terminal can obtain more specific system information by receiving the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH) based on the information on the PDCCH (S702).

[0090] On the other hand, if the terminal is initially connected to a base station or does not have radio resources for signal transmission, it can perform a Random Access Procedure (RACH) to the base station (steps S703 to S706). Therefore, the terminal can send a specific sequence to the preamble via a Physical Random Access Channel (PRACH) (S703 and S705) and receive a response message to the preamble via the PDCCH and corresponding PDSCH (S704 and S706). In the case of a contention-based RACH, a Contention Resolution Procedure can be performed.

[0091] A terminal that has followed the procedures described above can subsequently perform PDCCH / PDSCH reception (S707) and Physical Uplink Shared Channel (PUSCH) / Physical Uplink Control Channel (PUCCH) transmission (S708) as general uplink signal transmission procedures. In particular, the terminal receives Downlink Control Information (DCI) via PDCCH. Here, DCI includes control information such as resource allocation information for the terminal, and its format differs depending on its intended use.

[0092] On the other hand, control information that a terminal transmits to or receives from a base station via the uplink includes down / uplink ACK / NACK (Acknowledgement / Non-Acknowledgement) signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), etc. In the case of a 3GPP LTE system, the terminal can transmit the aforementioned control information such as CQI / PMI / RI via PUSCH and / or PUCCH.

[0093] Figure 8 shows an example of how physical channels within a slot are mapped in a wireless communication system to which this disclosure may apply.

[0094] Referring to Figure 8, a single slot contains the DL control channel, DL or UL data, and the UL control channel. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter referred to as the DL control area), and the last M symbols in the slot are used to transmit the UL control channel (hereinafter referred to as the UL control area). N and M are integers greater than or equal to 0. The resource area between the DL control area and the UL control area (hereinafter referred to as the data area) is used for transmitting DL data or UL data. A time gap exists between the control area and the data area for DL-to-UL or UL-to-DL switching. PDCCH is transmitted in the DL control area, and PDSCH is transmitted in the DL data area. Some symbols at the time of conversion from DL to UL within the slot are used as the time gap.

[0095] Downlink (DL) physical channel / signal

[0096] (1) PDSCH

[0097] The PDSCH carries downlink data (e.g., DL-shared channel transport block, DL-SCH TB). The TB is encoded into a codeword (CW), then transmitted after scrambling and modulation. A CW contains one or more code blocks (CBs). One or more CBs are grouped into a CBG (CB group). Depending on the cell configuration, a PDSCH can carry up to two CWs. Each CW is scrambled and modulated, and the modulation symbols generated from each CW are mapped to one or more layers. Each layer is precoded and mapped to a resource along with the DMRS, and transmitted at the corresponding antenna port. The PDSCH is either dynamically scheduled by the PDCCH (dynamic scheduling) or semi-statically scheduled based on higher-layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PDSCH transmission is accompanied by PDCCH, but in CS, PDSCH transmission is not accompanied by PDCCH. CS includes SPS (semi-persistent scheduling).

[0098] (2) PDCCH

[0099] The PDCCH carries DCI (Downlink Control Information). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation for the DL-SCH, frequency / time resource allocation information for the UL-SCH (shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, frequency / time resource allocation information for higher-layer control messages such as arbitrary connection responses (RARs) transmitted on the PDSCH, transmit power control commands, and information regarding the activation / deactivation of SPS / CS (Configured Scheduling). Various DCI formats are provided by the information within the DCI.

[0100] Table 5 illustrates the DCI format transmitted via PDCCH.

[0101] [Table 5]

[0102] DCI format 0_0 is used to schedule TB-based (or TB-level) PUSCHs, and DCI format 0_1 ​​is used to schedule TB-based (or TB-level) PUSCHs or CBG (Code Block Group)-based (or CBG-level) PUSCHs. DCI format 1_0 is used to schedule TB-based (or TB-level) PDSCHs, and DCI format 1_1 is used to schedule TB-based (or TB-level) PDSCHs or CBG-based (or CBG-level) PDSCHs (DL Grant DCI). DCI formats 0_0 / 0_1 are referred to as UL Grant DCI or UL scheduling information, and DCI formats 1_0 / 1_1 are referred to as DL Grant DCI or UL scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to transmit downlink pre-emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 are transmitted to terminals within a defined group via a Group common PDCCH, which is a PDCCH transmitted to terminals within that group. The PDCCH / DCI includes a CRC (cyclic redundancy check), which is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or intended use of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked to C-RNTI (Cell-RNTI). If the PDCCH relates to paging, the CRC is masked to P-RNTI (Paging-RNTI). If the PDCCH relates to system information (e.g., System Information Block, SIB), the CRC is masked to SI-RNTI (System Information RNTI).If PDCCH is related to arbitrary connection response, the CRC is masked to RA-RNTI (Random Access-RNTI).

[0103] Table 6 illustrates the applications and transmit channels of PDCCH by RNTI. The transmit channel refers to the transmit channel associated with the data carried by PDSCH / PUSCH scheduled by PDCCH.

[0104] [Table 6]

[0105] The modulation scheme of a PDCCH is fixed (e.g., Quadrature Phase Shift Keying, QPSK), and a single PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs) depending on the Aggregation Level (AL). A single CCE consists of 6 Resource Element Groups (REGs). A single REG is defined by one OFDM symbol and one (P)RB. The PDCCH is transmitted in a Control Resource Set (CORESET). A CORESET corresponds to a set of physical resources / parameters used to carry the PDCCH / DCI within the BWP. For example, a CORESET includes a set of REGs with a given pneumatics (e.g., SCS, CP length, etc.). CORESETs are configured by system information (e.g., MIB) or terminal-specific (UE-specific) upper-layer (e.g., RRC) signaling. Examples of parameters / information used to configure a CORESET are as follows. One or more CORESETs may be configured on a single terminal, and multiple CORESETs may be superimposed in the time / frequency domain.

[0106] - controlResourceSetId: Indicates the identification information (ID) of the CORESET.

[0107] - frequencyDomainResources: Indicates the frequency domain resources of CORESET. Indicated by a bitmap, each bit corresponds to an RB group (= 6 consecutive RBs). For example, the MSB (Most Significant Bit) of the bitmap corresponds to the first RB group in the BWP. The RB group corresponding to a bit with a value of 1 is allocated to the frequency domain resources of CORESET.

[0108] - duration: Indicates the time-domain resource of the CORESET. It indicates the number of consecutive OFDMA symbols that make up the CORESET. For example, duration can have values ​​from 1 to 3.

[0109] - cce-REG-MappingType: Indicates the CCE-to-REG mapping type. Interleaved and non-interleaved types are supported.

[0110] - precoderGranularity: Indicates the precoder granularity in the frequency domain.

[0111] - tci-StateSPDCCH: Indicates information (e.g., TCI-StateID) that indicates the TCI (Transmission Configuration Indication) state for the PDCCH. The TCI state is used to provide the QCL (Quasi-Co-Location) relationship between DL RS and PDCCH DMRS ports within the RS set (TCI-state).

[0112] - tci-PresentInDCI: Indicates whether the TCI field within the DCI is included.

[0113] - pdcch-DMRS-ScramblingID: Indicates information used to initialize the PDCCH DMRS scrambling sequence.

[0114] For PDCCH reception, the terminal monitors a set of PDCCH candidates in a CORESET (e.g., blind decoding). PDCCH candidates indicate the CCEs that the terminal monitors for PDCCH reception / detection. PDCCH monitoring is performed in one or more CORESETs on the active DL BWP on each activated cell where PDCCH monitoring is configured. The set of PDCCH candidates that the terminal monitors is defined as the PDCCH Search Space (SS) set. The SS set is either a Common Search Space (CSS) set or a Terminal-Specific Search Space (UE-specific Search Space, USS) set.

[0115] Table 7 illustrates the PDCCH search space.

[0116] [Table 7]

[0117] SS sets are configured by system information (e.g., MIB) or higher-level (e.g., RRC) signaling specific to the end-user (UE). Each DL BWP in a serving cell has up to S (e.g., 10) SS sets configured. For example, the following parameters / information are provided for each SS set (by the RRC information element (IE) SearchSpace). Each SS set is associated with one CORESET, and each CORESET configuration is associated with one or more SS sets. - searchSpaceId: Indicates the ID of the SS set.

[0118] - controlResourceSetId: Indicates the CORESET associated with the SS set.

[0119] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period interval (per slot) and the PDCCH monitoring period offset (per slot).

[0120] - monitoringSymbolsWithinSlot: Indicates the first OFDMA symbol for PDCCH monitoring within a slot where PDCCH monitoring is configured. Indicated via a bitmap, where each bit corresponds to each OFDMA symbol in the slot. The MSB of the bitmap corresponds to the first OFDMA symbol in the slot. The OFDMA symbol corresponding to the bit with a bit value of 1 corresponds to the first CORESET symbol in the slot.

[0121] - nrofCandidates: Indicates the number of PDCCH candidates for each AL={1, 2, 4, 8, 16} (for example, one of the values ​​0, 1, 2, 3, 4, 5, 6, 8).

[0122] - searchSpaceType: Indicates whether the SS type is CSS or USS.

[0123] - DCI format: Shows the DCI format of the PDCCH candidate.

[0124] Based on the CORESET / SS set configuration, the terminal can monitor PDCCH candidates in one or more SS sets within the slot. An occasion (e.g., time / frequency resource) for which a PDCCH candidate should be monitored is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities are configured within the slot.

[0125] Uplink (DL) physical channel / signal

[0126] (1) PUSCH

[0127] PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform. When PUSCH is transmitted based on a DFT-s-OFDM waveform, the terminal applies transform precoding before transmitting PUSCH. For example, if transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits PUSCH based on a CP-OFDM waveform; if transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits PUSCH based on either a CP-OFDM or DFT-s-OFDM waveform. PUSCH transmissions are either dynamically scheduled by PDCCH (dynamic scheduling) or semi-statically scheduled based on higher-level (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PDCCH transmissions are accompanied by PDCCH, but in CS, PDCCH transmissions are not accompanied by PDCCH. CS includes Type-1 CG (Configured Grant) PUSCH transmissions and Type-2 CG PUSCH transmissions. In Type-1 CG, all parameters for PUSCH transmissions are signaled by higher levels. In Type-2 CG, some parameters for PUSCH transmissions are signaled by higher levels, and the rest are signaled by PDCCH. Basically, in CS, PDCCH transmissions are not accompanied by PDCCH.

[0128] (2) PUCCH

[0129] PUCCH carries UCI (Uplink Control Information). UCI includes the following:

[0130] -SR (Scheduling Request): This is information used to request UL-SCH resources.

[0131] HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): This is a received response signal to DL signals (e.g., PDSCH, SPS-deactivated PDCCH). HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. HARQ-ACK is used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK is generated in TB-units / CBG-units.

[0132] -CSI (Channel Status Information): This is feedback information for DL ​​channels. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), etc.

[0133] Table 8 illustrates the PUCCH format. The PUCCH format is classified by the size of the UCI payload / transmission length (e.g., the number of symbols that make up the PUCCH resource) / transmission structure. The PUCCH format is classified into Short PUCCH (formats 0, 2) and Long PUCCH (formats 1, 3, 4) based on the transmission length.

[0134] [Table 8]

[0135] (0) PUCCH format 0 (PF0) - Supported UCI payload size: up to K bits (e.g., K=2)

[0136] - Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X=2)

[0137] -Transmission structure: Consists only of UCI signals without DM-RS, and transmits the UCI state by selecting and transmitting one of several sequences.

[0138] (1) PUCCH format 1 (PF1)

[0139] - Supportable UCI payload size: Up to K bits (e.g., K=2)

[0140] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4, Z=14)

[0141] - Transmission structure: DM-RS and UCI are configured in TDM form with different OFDM symbols, and UCI is a form that modulates (e.g., QPSK) symbols on a specific sequence. Both UCI and DM-RS apply CS (cyclic shift) / OCC (Orthogonal Cover Code) to support CDM between multiple PUCCH resources (following PUCCH format 1) (within the same RB).

[0142] (2) PUCCH format 2 (PF2)

[0143] - Supportable UCI payload size: Up to K bits (e.g., K=2)

[0144] - Number of OFDM symbols constituting a single PUCCH: 1 to x symbols (e.g., X=2)

[0145] -Transmission structure: DMRS and UCI are configured / mapped in FDM form within the same symbol, and the structure is transmitted by applying only IFFT without DFT to the encoded UCI bits.

[0146] (3) PUCCH format 3 (PF3)

[0147] - Supportable UCI payload size: K bits or more (e.g., K=2)

[0148] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4, Z=14)

[0149] -Transmission Structure: DMRS and UCI are configured / mapped to different symbols in TDM form, and DFT is applied to the encoded UCI bits for transmission. OCC is applied to the UCI at the beginning of the DFT, and CS (or IFDM mapping) is applied to DMRS to support multiplexing to multiple terminals.

[0150] (4) PUCCH format 4 (PF4)

[0151] - Supportable UCI payload size: K bits or more (e.g., K=2)

[0152] - Number of OFDM symbols constituting a single PUCCH: Y to Z symbols (e.g., Y=4, Z=14)

[0153] -Transmission structure: DMRS and UCI are configured / mapped to different symbols in TDM form, and DFT is applied to the encoded UCI bits for transmission without inter-terminal multiplexing.

[0154] Beam Management (BM)

[0155] A beam set (BM) procedure is an L1 (layer 1) / L2 (layer 2) procedure for acquiring and maintaining a beam set of a base station (e.g., gNB, TRP, etc.) and / or terminal (e.g., UE) that can be used for downlink (DL) and uplink (UL) transmission / reception, and may include the following procedures and terms:

[0156] - Beam measurement: An operation in which a base station or UE measures the characteristics of a beamforming signal received.

[0157] - Beam determination: The operation in which a base station or UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0158] - Beam sweeping: An operation that covers a spatial area using transmitted and / or received beams at regular time intervals in a predetermined manner.

[0159] - Beam report: An operation in which the UE reports information about the beamformed signal based on beam measurements.

[0160] BM procedures can be divided into (1) DL BM procedures using SS (synchronization signal) / PBCH (physical broadcast channel) blocks or CSI-RS, and (2) UL BM procedures using SRS (sounding reference signal).

[0161] Furthermore, each BM procedure may include a Tx beam sweep to determine the Tx beam and an Rx beam sweep to determine the Rx beam.

[0162]

[0163] The DL BM procedure can include (1) transmission for the beamformed DL RS (reference signal) of the base station (e.g., CSI-RS or SS block (SSB)), and (2) beam reporting of the terminal.

[0164] Here, the beam report can include the preferred DL RS ID (identifier)(s) and the corresponding L1-RSRP (Reference Signal Received Power).

[0165] The DL RS ID can be an SSBRI (SSB Resource Indicator) or a CRI (CSI-RS Resource Indicator).

[0166] As shown in FIG. 9, the SSB beam and the CSI-RS beam can be used for beam measurement. The measurement metric is the per-resource / block L1-RSRP. The SSB can be used for coarse beam measurement, and the CSI-RS can be used for fine beam measurement. The SSB can be used for both Tx beam sweeping and Rx beam sweeping.

[0167] Rx beam sweeping using the SSB can be performed while the UE changes the Rx beam for the same SSBRI across multiple SSB bursts. Here, one SS burst includes one or more SSBs, and one SS burst set includes one or more SSB bursts.

[0168]

[0169] Figure 10 is a flowchart of an example of a DL BM procedure using SSB.

[0170] The settings for beam reporting using SSB are performed during CSI / beam setup in RRC-connected state (or RRC-connected mode).

[0171] - The terminal receives a CSI-ResourceConfig IE from the base station, which includes a CSI-SSB-ResourceSetList containing the SSB resources used for BM (S410).

[0172] As shown in Table 9's CSI-ResourceConfig IE, BM settings using SSB are not defined separately; instead, SSB is configured like a CSI-RS resource.

[0173] [Table 9]

[0174] Table 9 shows that the parameters of csi-SSB-ResourceSetList represent a list of SSB resources used for beam management and reporting in a single resource set. Here, the SSB resource sets can be set to {SSBx1, SSBx2, SSBx3, SSBx4, ...}. The SSB index can be defined from 0 to 63. - The terminal receives the SSB resource from the base station based on the CSI-SSB-ResourceSetList (S420).

[0175] -If a CSI-RS reportConfig related to reporting to SSBRI and L1-RSRP is configured, the terminal (beam) reports the best SSBRI and its corresponding L1-RSRP to the base station (S430).

[0176] That is, when the reportQuantity of the CSI-RS reportConfig IE is set to "ssb-Index-RSRP", the terminal reports the best SSBRI and the corresponding L1-RSRP to the base station.

[0177] In addition, when the CSI-RS resource is set in the same OFDM symbol as the SSB (SS / PBCH block) and "QCL-TypeD" is applicable, the terminal can assume that the CSI-RS and the SSB are quasi co-located from the perspective of "QCL-TypeD".

[0178] Here, the QCL TypeD can be meant to be QCLed between antenna ports from the perspective of the parameters of spatial Rx. When the terminal receives multiple DL antenna ports in the relationship of QCL Type D, the same receive beam can be applied. Also, the terminal does not expect the CSI-RS to be set in the RE overlapping with the RE of the SSB.

[0179]

[0180] Regarding the CSI-RS usage, i) when the repetition parameter is set in a specific CSI-RS resource set and the TRS_info is not set, the CSI-RS is used for beam management. ii) when the repetition parameter is not set and the TRS_info is set, the CSI-RS is used for the TRS (tracking reference signal). iii) when the repetition parameter is not set and the TRS_info is not set, the CSI-RS is used for CSI acquisition.

[0181] Such repetition parameters can only be set for CSI-RS resource sets linked to L1 RSRP or CSI-ReportConfig that have a "No Report (or None)" report.

[0182] If a terminal receives a CSI-ReportConfig setting where reportQuantity is set to "cri-RSRP" or "none", and the CSI-ResourceConfig for channel measurement (higher layer parameter resourcesForChannelMeasurement) does not include the higher layer parameter "trs-Info", and includes an NZP-CSI-RS-ResourceSet with the higher layer parameter "repetition", then the terminal can consist only of ports (1-port or 2-port) with the same number and the higher layer parameter "nrofPorts" for all CSI-RS resources within the NZP-CSI-RS-ResourceSet.

[0183] When the (higher layer parameter) repetition is set to "ON", it is associated with the terminal's Rx beam sweeping procedure. In this case, when the terminal receives the NZP-CSI-RS-ResourceSet configuration, the terminal can assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted to the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted over the same Tx beam. Here, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet may be transmitted with different OFDM symbols. The terminal does not expect all CSI-RS resources in the NZP-CSI-RS-ResourceSet to receive different periodicities in periodicityAndOffset.

[0184] In contrast, when Repetition is set to "OFF", it is associated with the base station's Tx beam sweeping procedure. In this case, when repetition is set to "OFF", the terminal does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is sent to the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is sent via different Tx beams.

[0185] Figure 11 shows an example of a DL BM procedure using CSI-RS. Figure 11a shows the procedure for determining (or improving) the terminal's Rx beam, and Figure 11b shows the procedure for determining the base station's Tx beam. In Figure 11a, the repeat parameter is set to "ON", and in Figure 11b, the repeat parameter is set to "OFF".

[0186] Refer to Figures 11a and 12 to see the determination process of the terminal's Rx beam.

[0187] Figure 12 is a flowchart showing an example of the process for determining the received beam of a terminal.

[0188] The terminal receives an NZP CSI-RS resource set IE from the base station via RRC signaling, which includes a repeating parameter for the upper layer (S610). Here, the repeating parameter is set to "ON".

[0189] The terminal repeatedly receives resources within the CSI-RS resource set that are repeatedly set to "ON" via the same Tx beam (or DL ​​spatial domain transfer filter) of the base station, each with different OFDM symbols (S620).

[0190] The terminal determines its own Rx beam (S630).

[0191] The terminal may omit the CSI report or forward the CSI report, including CRI / L1-RSRP, to the base station (S640). In this case, the reportQuantity in the CSI report config can be set to "No report (or None)" or "CRI and L1-RSRP".

[0192] In other words, if the terminal is repeatedly set to "ON", it is possible to omit CSI reporting.

[0193] Refer to Figures 11b and 13 to see the Tx beam determination process for the base station.

[0194] Figure 13 is a flowchart illustrating an example of the base station's transmission beam determination process.

[0195] The terminal receives an NZP CSI-RS resource set IE containing repeating upper-layer parameters from the base station via RRC signaling (S710).

[0196] Here, the aforementioned repeating parameter is set to "OFF" and is associated with the base station's Tx beam sweeping procedure.

[0197] Furthermore, the terminal receives resources within the CSI-RS resource set that are repeatedly set to "OFF" via different Tx beams (DL spatial domain transfer filters) of the base station (S720).

[0198] Furthermore, the terminal selects (or determines) the best beam (S730) and reports the ID and associated quality information (e.g., L1-RSRP) for the selected beam to the base station (S740).

[0199] In this case, the reportQuantity in the CSI report config can be set to "CRI + L1-RSRP".

[0200] Figure 14 shows an example of resource allocation in the time and frequency domains related to the operation shown in Figure 11.

[0201] In other words, when the CSI-RS resource set is repeatedly set to "ON," multiple CSI-RS resources are repeatedly used, applying the same transmit beam. Conversely, when the CSI-RS resource set is repeatedly set to "OFF," different CSI-RS resources are transferred to different transmit beams.

[0202] <dl bm関連のビーム指示(beam indication)>

[0203] The terminal can receive RRC settings for a list of up to M candidate Transmission Configuration Indication (TCI) states, at least for the purpose of QCL (Quasi Co-location) instruction, where M can be 64.

[0204] Each TCI state can be assigned to a single RS set. At least the ID of each DL RS for spatial QCL purposes (QCL Type D) within the RS set can refer to one of the DL RS types, such as SSB, P-CSI RS, SP-CSI RS, A-CSI RS, etc.

[0205] The initialization / update of DL RS IDs within an RS set used at least for spatial QCL purposes can be performed at least via explicit signaling.

[0206] Table 10 shows an example of a TCI-State IE. A TCI-State IE is associated with the corresponding quasi co-location (QCL) type of one or two DL reference signals (RS).

[0207] [Table 10]

[0208] In Table 10, the bwp-Id parameter indicates the DL BWP on which the RS is located, the cell parameter indicates the carrier on which the RS is located, and the reference signal parameter indicates the reference antenna port or reference signal containing it that serves as the source for quasi co-location for the target antenna port. The target antenna port may be a CSI-RS, PDCCH DMRS, or PDSCH DMRS. For example, to specify RS information for QCL reference for an NZP CSI-RS, the corresponding TCI state ID can be specified in the resource configuration information of the NZP CSI-RS. As another example, to specify QCL reference information for a PDCCH DMRS antenna port, the TCI state ID can be specified in the settings of each CORESET. As yet another example, to specify QCL reference information for a PDSCH DMRS antenna port, the TCI state ID can be specified via DCI.

[0209] <QCL(Quasi-Co Location)>

[0210] Antenna ports are defined such that the channels on which symbols are carried on an antenna port can be inferred from the channels on which other symbols on the same antenna port are carried. If the properties of the channels on which symbols are carried on one antenna port can be inferred from the channels on which symbols are carried on another antenna port, then the two antenna ports are said to be in a QC / QCL (quasi co-located or quasi co-location) relationship.

[0211] Here, the channel characteristics include one or more of the following: delay spread, Doppler spread, frequency / Doppler shift, average received power, received timing / average delay, and spatial RX parameter. Here, the spatial Rx parameter refers to a spatial (received) channel characteristic parameter such as angle of arrival.

[0212] The terminal can be configured in a list of up to M TCI-State configurations within the higher-level parameter PDSCH-Config in order to decode the PDSCH with the detected PDCCH having the intended DCI for the terminal and the given serving cell. The number M depends on the UE capability.

[0213] Each TCI-State includes parameters for setting the quasi-co-location relationship between one or two DL reference signals and the DM-RS port of the PDSCH.

[0214] The Quasi co-location relationship is determined by the higher-level parameter qcl-Type1 for the first DL RS and qcl-Type2 (if set) for the second DL RS. For two DL RSs, the QCL type is not the same regardless of whether the references are the same DL RS or different DL RSs.

[0215] The quasi co-location type corresponding to each DL RS is given by the qcl-Type parameter in the higher layer of QCL-Info, and can take one of the following values.

[0216] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0217] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0218] - "QCL-TypeC": {Doppler shift, average delay}

[0219] - "QCL-TypeD":{Spatial Rx parameter}

[0220] For example, if a target antenna port is a specific NZP CSI-RS, that NZP CSI-RS antenna port can be instructed / configured to be QCL-Type A with a specific TRS and QCL-Type D with a specific SSB. A terminal that receives such instructions / configurations can receive the NZP CSI-RS using the Doppler and delay values ​​measured on the QCL-Type A TRS, and apply the received beam used for QCL-Type D SSB reception to the reception of the NZP CSI-RS.

[0221] The UE receives activation commands used to map up to eight TCI states to codepoints in the DCI field "Transmission Configuration Indication".

[0222]

[0223] UL BM determines whether beam reciprocity (or beam correspondence) between the Tx beam and Rx beam can be established or not, depending on the implementation of the terminal. If beam reciprocity between the Tx beam and Rx beam can be established at both the base station and the terminal, the UL beam pair can be aligned via the DL beam pair. However, if beam reciprocity between the Tx beam and Rx beam cannot be established at either the base station or the terminal, a separate process for determining the UL beam pair is required, distinct from the determination of the DL beam pair.

[0224] Furthermore, even if both the base station and the terminal maintain beam association, the base station can use the UL BM procedure to determine the DL Tx beam without requiring the terminal to report its preferred beam.

[0225] UL BM can be executed via beamformed UL SRS transmission, and the applicability of UL BM to an SRS resource set is set by the (higher layer parameter) usage. When usage is set to "BeamManagement (BM)", only one SRS resource can be sent to each of multiple SRS resource sets in a given time instant.

[0226] A terminal can be configured with one or more Sounding Reference Symbol (SRS) resource sets (via upper-layer signaling, RRC signaling, etc.) as defined by the (upper-layer parameter) SRS-ResourceSet. For each SRS resource set, the UE can be configured with K≧1 SRS resources (upper-layer parameter SRS-resource), where K is a natural number, and the maximum value of K is indicated by SRS_capability.

[0227] Similar to DL BM, the UL BM procedure can also be divided into terminal Tx beam sweeping and base station Rx beam sweeping.

[0228] Figure 15 shows an example of an UL BM procedure using SRS. Specifically, Figure 15a shows the Rx beam determination procedure for the base station, and Figure 15b shows the Tx beam determination procedure for the terminal.

[0229] Figure 16 is a flowchart showing an example of an UL BM procedure using SRS.

[0230] The terminal receives RRC signaling (e.g., SRS-Config IE) from the base station, which includes usage parameters (upper layer parameters) set to "Beam Management" (S1010).

[0231] Table 11 shows an example of an SRS-Config IE (Information Element), which is used for SRS forwarding configuration. The SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set represents a set of SRS-resources.

[0232] The network triggers the transfer of SRS resource sets using the configured aperiodicSRS-ResourceTrigger (L1 DCI).

[0233] [Table 11]

[0234] Table 11 shows that usage is a higher-level parameter that indicates whether an SRS resource set is used for beam management or for codebook-based or non-codebook-based transfers. The usage parameter corresponds to the L1 parameter "SRS-SetUse". "spatialRelationInfo" is a parameter that indicates the setting of the spatial relation between the reference RS and the target SRS. Here, the reference RS can be an SSB, CSI-RS, or SRS corresponding to the L1 parameter "SRS-SpatialRelationInfo". The usage is set per SRS resource set. The terminal determines the Tx beam for the SRS resource to be transferred based on the SRS-SpatialRelationInfo included in the SRS-Config IE (S1020). Here, SRS-SpatialRelationInfo is set per SRS resource and indicates whether the same beam used for SSB, CSI-RS, or SRS is applied for each SRS resource. Additionally, each SRS resource may or may not have SRS-SpatialRelationInfo set.

[0235] If SRS-SpatialRelationInfo is set for the SRS resource, the same beam used for SSB, CSI-RS, or SRS is applied and transmitted. However, if SRS-SpatialRelationInfo is not set for the SRS resource, the terminal arbitrarily determines the Tx beam and transmits SRS through the determined Tx beam (S1030).

[0236] More specifically, regarding P-SRS where "SRS-ResourceConfigType" is set to "Periodic"

[0237] i) If SRS-SpatialRelationInfo is set to "SSB / PBCH", the UE applies the same spatial domain transfer filter (or one generated from the same filter) as the spatial domain Rx filter used for receiving SSB / PBCH, and transfers the corresponding SRS resource. Or,

[0238] ii) If SRS-SpatialRelationInfo is set to "CSI-RS", the UE will forward SRS resources that have the same spatial domain forwarding filter used for receiving periodic CSI-RS or SP CSI-RS. Or,

[0239] iii) If SRS-SpatialRelationInfo is set to "SRS", the UE applies the same spatial domain transfer filter used for periodic SRS transfers and transfers the corresponding SRS resource.

[0240] The same applies when "SRS-ResourceConfigType" is set to "SP-SRS" or "AP-SRS".

[0241] Furthermore, the terminal may receive or not receive feedback from the base station to the SRS in the following three cases (S1040):

[0242] i) If Spatial_Relation_Info is set for all SRS resources in the SRS resource set, the terminal will transmit SRS on the beam indicated by the base station. For example, if all Spatial_Relation_Info indicate the same SSB, CRI, or SRI, the terminal will repeatedly transmit SRS on the same beam. In this case, the base station selects the Rx beam, corresponding to Figure Ga.

[0243] ii) Spatial_Relation_Info may not be set for all SRS resources within an SRS resource set. In this case, the terminal can freely change the SRS beam during transmission. That is, in this case, the terminal selects the Tx beam, which corresponds to Figure Gb.

[0244] iii) Spatial_Relation_Info can be set for only some of the SRS resources within the SRS resource set. In this case, for the SRS resources for which Spatial_Relation_Info is set, the SRS will be forwarded with the designated beam, and for SRS resources for which Spatial_Relation_Info is not set, the terminal can arbitrarily apply a Tx beam for forwarding.

[0245] NES (Network Energy Saving)

[0246] Energy conservation at base stations is considered important in wireless communication systems, including 3GPP, because it can contribute to building environmentally friendly networks and reducing the operational expenditure (OPEX) of telecommunications operators by reducing carbon emissions. In particular, with the introduction of 5G communication, high transmission rates are required, so base stations must be equipped with more antennas and provide services over wider bandwidths and frequency bands. As a result, energy costs for base stations have reached 20% of the total OPEX, according to recent research. Therefore, 5G systems adopt various technologies to reduce energy consumption under the name of NES (network energy savings), and the standardization of related technologies is expected to continue. Specifically, the recently held Rel-18 meeting discussed the following techniques.

[0247] [Table 12]

[0248] The application of NES technology allows a base station to perform operations such as adjusting on / off states over a fixed time interval (duration) on the time axis, adjusting transmit / receive resources for UE-common or UE-specific signals / channels, changing the amount of frequency-axis resources, adjusting transmit power, or turning on / off antenna ports, TRPs (transmission-reception points), etc., in the spatial domain. Figure 17 shows an example of the operating procedure of a base station supporting NES technology. Referring to Figure 17, the base station identifies the NES solution(s) to be applied. The NES solution(s) are associated with signal transmission / reception control (e.g., on / off), beam operation, handover procedures, channel measurement, and reporting. Which NES solution(s) to apply can be adaptively selected or predefined depending on the current situation (e.g., cell load level, characteristics of connected terminals, etc.). Once the base station has identified the NES solution(s), it performs signaling for NES. The specific signaling procedure can vary depending on the confirmed NES solution(s). For example, a base station may transmit common information to the NES solution(s), or configuration information necessary for NES operation to at least one terminal, or control information for the progress of NES operation to at least one terminal. The base station may also receive capability information related to NES from at least one terminal. Thereafter, the base station performs operations for the NES. At this time, the base station can perform operations for the NES based on the previously performed signaling. That is, based on the system information, configuration information, and control information transmitted via signaling, the base station can turn on / off the transmission and reception of specific signals, or turn on / off elements of a spatial domain, or adjust resources for the transmission and reception of measurement signals.

[0249] The NES technology can be executed via a procedure as shown in FIG. 17. Examples of NES solutions executable by a procedure as shown in FIG. 17 are as follows.

[0250] · Intra-system energy saving solution: The RAN node requests an adjacent RAN node to switch at least one SSB beam into its deactivated cell, or paging can be performed using a restricted set of beams for inactive state terminals (e.g., stationary terminals).

[0251] · Inter-system energy saving solution: The NG-RAN node having a capacity booster cell can autonomously convert the corresponding cell to an inactive state.

[0252] · SSB-less SCell solution: When no SSB or SMTC (SSB-based RRM measurement timing configuration) setting for the SCell is provided, the terminal can obtain timing reference and AGC source from other serving cells. In FR1 or FR2, the base station can configure intra-band CA or inter-band CA including SSB transmission-less SCell, in which case, SSB / SIB transmission can be triggered by the terminal's WUS (wake up signal). Thereby, since the period of common channels / signals such as SSB increases, the base station is in a sleep state for a longer time.

[0253] · Cell DTX / DRX solution: In order to reduce the downlink transmission / uplink reception activity time of the base station, a periodic cell DTX / DRX pattern (e.g., active and inactive periods) can be commonly set for terminals within the cell having the corresponding feature. Here, the cell DTX pattern and the cell DRX pattern can be set and activated separately, and a maximum of two cell DTX / DRX patterns can be set per MAC entity. When the cell DTX is set and activated, at least one of monitoring for SPS opportunities or monitoring PDCCH can be interrupted during the cell DTX inactive period. When the cell DRX is set and activated, at least one of transmission on the CG resource or SR transmission can be interrupted during the cell DRX inactive period. The cell DTX / DRX can be activated / deactivated via RRC signaling or L1 group common signaling.

[0254] · Parameters such as active duration, cycle, etc. can be set for the cell DTX / DRX. The active duration is the period during which the terminal waits to receive the PDCCH or SPS opportunity to transmit the SR or CG, and the cycle specifies the periodic repetition of the active period and the inactive period. When both the cell DTX and the cell DRX are set, parameters such as the active duration and the cycle are common. If the base station recognizes an emergency call or a public safety-related service (e.g., MPS or MCS), the network can release or deactivate the cell DTX / DRX setting so as not to affect the corresponding service. Also, at least partial overlap is required between the active duration of the terminal's connected mode DRX and the active duration of the cell DTX / DRX. For example, that is, the connected mode DRX period of the terminal is a multiple of the cell DTX / DRX period, or vice versa.

[0255] • Conditional handover (CHO) solution: A CHO procedure is used while NES technology is applied (e.g., when a cell activates or deactivates cell DTX / DRX), in which the terminal determines whether to execute the handover. In this case, the terminal can use an NES-specific CHO event to execute the CHO on a candidate cell, and the reception of a DCI can be applied as an additional triggering condition for this, which activates the CHO conditions set in the NES event indication.

[0256] • Spatial and power domain adaptation solution: To support gNB for transceiver muting and / or transmit power adaptation, the terminal can be configured to report multiple CSI entries in the CSI report based on multiple sub-configurations. Each sub-configuration corresponds to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a data channel (e.g., PDSCH) and a power offset between CSI-RS. The application of the spatial and power domain adaptation solution can affect CSI configuration, measurement, and / or reporting behavior.

[0257] CSI measurement and reporting

[0258] Figure 18 shows an example of the procedure for CSI measurement and reporting.

[0259] Referring to Figure 18, the base station transmits configuration information for CSI to the terminal. The configuration information for CSI may include information related to CSI-RS resources or resource sets (e.g., time-frequency resource information, sequence information, power information, etc.), information related to CSI reporting (e.g., reporting item (quantity) information, reporting type information, reporting resource information, codebook information, etc.), and information related to CSI measurement. Here, to assist the base station in transceiver muting and / or transmit power adaptation, the terminal can be configured to report multiple CSI entries in the CSI report based on multiple sub-configurations, where each sub-configuration corresponds to a spatial domain adaptation pattern (e.g., a subset of available spatial elements) and / or a power offset. Furthermore, in relation to CSI reporting, higher-level parameters included in the configuration information (e.g., CSI-ReportConfig) may include a catalog of subconfigurations, each subconfiguration being identified by an identifier (e.g., csi-ReportSubConfigID) and corresponding to a catalog of at least one CSI-RS resource, or a subset of CSI-RS antenna ports, and / or, in addition to power control offset-related parameters (e.g., powerControlOffset) for the CSI-RS resource(s), power offsets for PDSCHs associated with CSI-RS.

[0260] In this case, the settings related to CSI can include multiple sub-settings. This allows the terminal to consider the sub-settings when analyzing the configuration information for CSI to determine CSI-RS resources, CSI-RS port mapping, power offset, codebook type, reporting items, etc. If the terminal is configured with configuration information related to CSI reporting that includes sub-settings (e.g., CSI-ReportConfig), the terminal does not expect the higher-level parameters related to the reporting items (e.g., reportQuantity) to be set to "cri-RSRP", "cri-SINR", "cri-SINR-Index", "cri-RSRP-Index", "none", "ssb-Index-RSRP", "ssb-Index-SINR", "ssb-Index-RSRP-Index", "ssb-Index-SINR-Index", or "tdcp". Also, if the type of CSI reporting is set to semi-persistent CSI reporting or aperiodic CSI reporting, the base station can activate / trigger only some of the sub-settings configured on the terminal via MAC-CE or DCI. In other words, the trigger state for aperiodic CSI reporting can be set as needed, and the activation of semi-static CSI reporting can be controlled by an activation command.

[0261] For example, in relation to the settings for a reporting item, the terminal can determine the CSI-RS port index(s) for each CSI-RS resource based on information related to the sub-setting port-subset (hereinafter referred to as the "port-subset indicator"). The port-subset indicator may include a bitmap for identifying some of the antenna ports for the CSI-RS resource in question. Therefore, the terminal can identify at least one antenna port for the relevant sub-setting based on the position of the bit set to a positive value (e.g., 1) in the port-subset indicator.

[0262] For example, in relation to settings for reporting items, the terminal can determine the codebook type based on the existence of sub-settings. Specifically, if sub-settings are configured for a CSI report, the terminal can exclude settings for at least one codebook type. However, depending on the terminal's capabilities, it may be possible for at least one such codebook type to be configured.

[0263] For example, in relation to the settings for reporting items, power offset values ​​and NZP CSI-RS resource sets can be set for each sub-setting. In this case, the analysis of the NZP CSI-RS resource set for each sub-setting can change depending on whether or not the power offset value and NZP CSI-RS resource set can be set for each sub-setting.

[0264] In determining the CQI, higher-level parameters related to time limits for channel measurements (e.g., timeRestrictionForChannelMeasurements) can be set. In this case, the terminal should derive a channel estimate for determining the CSI based on the latest CSI reference resource. At this time, if the cell DTX to the base station is activated, the cell DTX activation time can be taken into consideration.

[0265] The CSI is derived based on the CSI reference resource. The CSI reference resource is defined as a group of downlink physical resource blocks corresponding to the bandwidth associated with the CSI derived in the frequency domain, and is defined in a single downlink slot determined in the time domain based on higher-level parameters and subcarrier intervals. After receiving the CSI-RS, the terminal should send a CSI report without delay from the CSI reference resource. If sub-configurations are set for the CSI report, the CSI reference resource is considered separately for each sub-configuration.

[0266] If configured to report at least one of the CQI index, PMI, or RI, the terminal can make specific assumptions about the CSI reference resource, such as the symbol positions and number occupied by control signaling, the number of PDSCH and DMRS symbols, the subcarrier interval of the BWP, the bandwidth for CQI reporting, the CP length and subcarrier interval of the reference resource, and the RV (redundancy version), for the purpose of deriving at least one of the CQI index, PMI, or RI. In this case, if sub-configurations are set for CSI reporting, assumptions about the antenna port, EPRE, etc., can be determined based on the sub-configurations.

[0267] Next, the base station transmits at least one CSI-RS. This allows the terminal to receive at least one CSI-RS and perform the measurement. At least one CSI-RS can be transmitted via a CSI-RS resource or resource set configured by the configuration information.

[0268] In this case, if the terminal is set to DRX, the terminal can perform measurements as follows: For example, if the terminal is set to monitor power saving-related control information (e.g., DCI format 2_6) and the DRX-related timer (e.g., drx-onDurationTimer) is not started by a higher-level parameter (e.g., ps-TransmitOtherPeriodicCSI), and the terminal is set to report CSI using the reporting configuration type set by periodic reporting and reporting items set to items other than cri-RSRP and ssb-index-RSRP, then the latest CSI measurement opportunity will occur during the time indicated by drx-onDurationTimer in the DRX-related configuration information (e.g., DRX-Config), other than the DRX activation time or the DRX activation time for the reported CSI. As another example, if a terminal is configured to monitor power saving-related control information (e.g., DCI format 2_6), and a higher-level parameter (e.g., ps-TransmitPeriodicL1-RSRP) prevents drx-onDurationTimer from starting, and the terminal is configured to report L1-RSRP using the reporting configuration type set by periodic reporting and the reporting items set in cri-RSRP, then the latest CSI measurement opportunity will occur during the time indicated by drx-onDurationTimer in the DRX-related configuration information (e.g., DRX-Config), other than the DRX activation time or the DRX activation time for the reported CSI. In addition, the latest CSI measurement opportunity will occur within the DRX activation time for the reported CSI.

[0269] On the other hand, a base station can perform cell DTX / DRX operation. In this case, during the deactivation period of cell DTX, terminals configured for cell DTX do not expect to receive periodic CSI-RS and semi-static CSI-RS as configured by the CSI reporting settings associated with reporting items that include at least RI (rank indicator). When cell DTX is activated for a serving cell, the latest CSI measurement opportunities for semi-static CSI-RS resources or periodic CSI-RS resources occur within the activation period of cell DTX for CSI reporting, as configured by the configuration information associated with CSI reporting (e.g., CSI-ReportConfig) associated with reporting items that include at least RI.

[0270] A terminal that receives at least one CSI-RS determines the CSI. That is, the terminal performs the CSI calculation. At this time, the terminal can perform the CSI calculation based on the CSI processing criteria. The terminal can specify the number of concurrently supported CSI calculations, i.e., the number of CSI processing units (CPUs) that can proceed simultaneously, NCPU. The terminal can determine the number of CPUs for a given CSI report based on at least one of the following: NCPU, the number of CPUs for each CSI report, the number of CPUs currently occupied, or the settings of the report item. For example, for configuration information associated with a CSI report (e.g., CSI-ReportConfig) that includes a report item parameter (e.g., reportQuantity) that is not set to "none", the CPUs can be occupied between at least one OFDM symbol, where the number of at least one symbol can be determined based on the CSI-RS resources or CSI-IM resources associated with the sub-configuration.

[0271] When the configuration information related to the CSI report (e.g., CSI-ReportConfig) includes multiple sub-configurations, the number of CPUs occupied by the CSI report is determined based on the number of CSI-RS resources corresponding to the sub-configurations. At this time, the number of CSI-RS resources can be determined based on the number of times the configuration information (e.g., CSI-ReportConfig) related to the CSI report is referred to or the number of sub-configurations referring to the corresponding CSI-RS resources.

[0272] The terminal that determines the CSI sends a CSI report to the base station. The terminal can send the CSI(es) for at least one sub-configuration according to the report item parameter (e.g., reportQuantity) set for the configuration information (e.g., CSI-ReportConfig) related to the CSI report. For example, the CSI report can include at least one of PMI, CQI, RI, CRI, SSBRI, LI, and RSRP. At this time, the CSI report can include a part 1 CSI report and a part 2 CSI report. Also, the CSI report can be sent via at least one of PUCCH or PUSCH.

[0273] When the terminal multiplexes a CSI report including a part 2 CSI report on a PUCCH resource, the terminal determines the number of PUCCH resources and the number of PRBs for the PUCCH resources or the number of part 2 CSI reports under the assumption that each CSI report or each CSI sub-report included in the CSI report indicates rank 1 or rank combination {1, 1}. When the higher layer parameter (e.g., csi-ReportMode) related to the CSI report mode is set to "Mode2", the terminal determines the number of PUCCH resources and the number of PRBs for the PUCCH resources or the number of part 2 CSI reports under the assumption that each CRI of the CSI report is related to a resource pair.

[0274] If a CSI report in PUSCH contains two parts, the terminal may omit part of the Part 2 CSI. The omission of Part 2 CSI follows priority order. Unless the corresponding CSI report contains at least one CSI sub-report including Part 2 that corresponds to a sub-configuration from a catalog of sub-configurations provided by a higher-level parameter (e.g., csi-ReportSubConfigList) included in the information related to the CSI report (e.g., CSI-ReportConfig), the terminal should omit all information at that priority level when omitting Part 2 CSI information for a particular priority level.

[0275] For information related to a CSI report, including a catalog of sub-configurations (e.g., CSI-ReportConfig), and associated reporting configurations, the following processing is possible: For a corresponding CSI report containing at least one CSI sub-report, Part 2 CSI omission is performed at the sub-configuration level within the same priority level. Here, sub-configurations with lower index values ​​have higher priority.

[0276] If any CSI report consists of two parts, the terminal may omit a portion of Part 2 CSI. The omission of Part 2 CSI follows a priority order. For a given CSI report that includes at least one CSI sub-report for information related to the CSI report, including a catalog of sub-configurations (e.g., CSI-ReportConfig), and associated reporting settings, the omission of Part 2 CSI is defined in Section 5.2.3. Part 2 CSI is omitted starting from the lowest priority level down to a Part 2 CSI coding rate that is less than or equal to the coding rate set by the higher-level parameter (e.g., maxCodeRate).

[0277] Furthermore, when a CQI request field within a DCI triggers a CSI report(s) in a PUSCH, the first uplink symbol carrying the CSI report(s) will not precede any symbols identified after a certain interval from the last symbol of the PDCCH that carried the DCI. This can be understood as ensuring the CSI calculation time. In this case, if multiple sub-settings are configured for the CSI report, the start position of the aforementioned interval can be determined based on all triggered sub-settings.

[0278] Specific Examples of the Disclosure

[0279] This disclosure relates to a technique for reporting CSIs based on sub-configurations in a wireless communication system. In particular, this disclosure relates to a technique for transmitting CSIs for multiple sub-configurations, i.e., CSI sub-reports, taking overhead into consideration, and aims to propose various embodiments for transmitting CSIs for sub-configurations.

[0280] A base station can operate technologies for NES purposes, such as adjusting the on / off state of UEs over a certain time interval (duration), adjusting transmit / receive resources for UE-common or UE-specific signals / channels, changing the amount of resources on the frequency axis, adjusting transmit power, or turning on / off antenna ports (APs), TRPs, etc., in the spatial domain. In this disclosure, the listed technologies are referred to as "NES technologies" or "NES_tech," and the state in which at least one of the NES_techs is applied is referred to as an "NES mode" or "NES state." For example, an example of state control of antenna elements by NES mode is shown in Figures 19a to 19c below. Referring to Figures 19a to 19c, energy saving is possible by adaptively turning on / off some of the antenna elements among multiple antenna elements connected to multiple TxRUs (transmit radio units). The base station can also inform terminals which NES_tech(etc.) applies to each NES_tech or NES_tech group [Approach 1], and can pre-configure corresponding NES_tech or NES_tech groups(etc.) for each code-point of a specific indicator [Approach 2]. Here, the specific indicator can be indicated by DCI or MAC CE, or configured by higher-level signaling.

[0281] In Approach 1, if at least one NES_tech is applied to a terminal, the state can be defined as an NES mode or NES state, and further, different NES modes or different NES states can be treated depending on which NES_tech is applied. An NES mode or NES state means whether at least one NES technology is applicable, or can be used as a concept that more indicates which NES technologies are applied. When an NES mode or NES state more indicates which NES technologies are applied, different NES modes or different NES states can include different combinations of NES_tech. In Approach 2, for example, if a 1-bit indicator is used, "0" can indicate that the corresponding NES_tech is not applied, and "1" can indicate that at least one NES_tech is applied. In this case, if "1" is indicated via the indicator, the state can be defined as an NES mode or NES state. As another example, when a 2-bit directive is used, "00" can indicate that the corresponding NES_tech is not applied, "01" indicates that at least one NES_tech_A is applied, "10" indicates that at least one NES_tech_B is applied, and "11" indicates that at least one NES_tech_C is applied. In this case, if a code point other than "00" is indicated via the directive, the state can be defined as NES mode or NES state. Furthermore, the terminal can determine that NES state #1 is confirmed if "01" is confirmed, NES state #2 if "10" is confirmed, and NES state #3 if "11" is confirmed. Thus, whether and / or what kind of NES state is being used can be distinguished by code point.

[0282] For NES purposes, a base station can turn on / off certain spatial elements (e.g., APs, active transmit / receive chains, panels, or TRPs) or adjust the power values ​​for downlink signals / channels. To dynamically apply such diverse NES techniques in the spatial and power domains, a base station can link CSI-RS resources or resource sets with different APs for a single CSI report setting (e.g., CSI-ReportConfig), or link multiple power offsets (e.g., the powerControlOffset parameter, which is the power offset value between PDSCH and CSI-RS, the powerControlOffsetSS parameter, which is the power offset value between SSS and CSI-RS, etc.).

[0283] A single CSI reporting configuration (e.g., CSI-ReportConfig) can include multiple subconfigurations based on different numbers of antenna ports or different power offset values. Specifically, a single CSI reporting configuration can be associated with CSI-RS resources or sets of CSI-RS resources, each having a different number of APs, or with multiple power offsets. Here, the power offset includes the powerControlOffset parameter, which is the power offset value between the PDSCH and CSI-RS, or the powerControlOffsetSS parameter, which is the power offset value between the SSS and CSI-RS. In this case, at least one of the following CSI frameworks can be introduced:

[0284] -Framework #1: Multiple CSI-RS resource sets are linked to a single CMR (channel measurement resource) or IMR (interference measurement resource) within CSI-ReportConfig. Here, the CMR can be configured using the resourcesForChannelMeasurement parameter, and the IMR can be configured using the csi-IM-ResourcesForInterference or nzp-CSI-RS-ResourcesForInterference parameter. For example, resource set #1 and resource set #2 may be linked to a CMR, with CSI-RS resources belonging to resource set #1 consisting of 16 APs (antenna ports, APs) and CSI-RS resources belonging to resource set #2 consisting of 8 APs.

[0285] -Framework #2: When a linked CSI-RS resource set is configured for one CMR or one IMR within CSI-ReportConfig, at least one CSI-RS resource(s) with different attributes such as the number of APs and / or power offset within that CSI-RS resource set will be configured. For example, for CSI-RS resource set #1 configured for a CMR, CSI-RS resource #1 belonging to CSI-RS resource set #1 may be set to 16 APs, and CSI-RS resource #2 belonging to the same set may be set to 8 APs. For example, for CSI-RS resource set #1 configured for a CMR, CSI-RS resource #1 belonging to CSI-RS resource set #1 may be set to power offset #1, and CSI-RS resource #2 belonging to the same set may be set to power offset #2.

[0286] -Framework #3: If a single CSI-RS resource set linked to a single CMR or IMR is configured within CSI-ReportConfig, some or all of the CSI-RS resources within that set can be configured to multiple AP counts and / or power offset values. For example, for CSI-RS resource set #1 configured for a CMR, CSI-RS resource #1 belonging to CSI-RS resource set #1 can be configured to a maximum of 16 APs, and a CSI report utilizing at least one of these APs can be configured. Alternatively, CSI-RS resource #2 belonging to the same CSI-RS resource set #1 can be configured to multiple power offset values, and a CSI report utilizing all or some of the power offsets can be configured.

[0287] The CSI reporting method can be defined for the aforementioned CSI framework through at least one of the following options.

[0288] -Option #1: A single CSI report can include all CSIs that take into account multiple AP values ​​and / or multiple power offset values ​​set in a single CSI report. Alternatively, a single CSI report can include a CSI that takes into account multiple AP values ​​and / or multiple power offset values ​​determined via the base station settings / instructions. In this case, the AP values ​​and / or power offset values ​​set / instructed via the base station are only a portion of the AP values ​​and / or power offset values ​​set in the relevant CSI report.

[0289] -Option #2: Even if multiple AP values ​​and / or multiple power offset values ​​are set in a single CSI report, a CSI(et) that considers a single AP value and / or a single power offset value can be included in a single CSI report via the base station settings / instructions.

[0290] -Option #3: Even if multiple AP values ​​and / or multiple power offset values ​​are set in a single CSI report, a single CSI report may include some AP values ​​and / or some power offset values ​​that are considered through terminal judgment / decision / selection based on criteria set or defined by the base station.

[0291] A configuration for CSI reporting (e.g., CSI-ReportConfig) can contain more than 1, L sub-configurations, each of which can correspond to either a spatial domain adaptation pattern or a power domain adaptation pattern.

[0292] Here, the spatial domain adaptation pattern can correspond to a specific number of APs or AP on / off patterns, or to a specific CSI-RS power value (e.g., the CSI-RS power value determined by the powerControlOffsetSS parameter, which is the power offset value between SSS and CSI-RS, because if some antenna elements corresponding to one AP are turned off, it can affect the CSI-RS power value). For example, when applying framework #2, the number of A1 APs or the P1 power value can be set for CSI-RS index #n1 belonging to the resource set, and the number of A2 APs or the P2 power value can be set for CSI-RS index #n2 belonging to the same resource set. In this case, by setting sub-configuration index #s1 to be linked to CSI-RS index #n1 and sub-configuration index #s2 to be linked to CSI-RS index #n2, different spatial domain adaptation patterns can be set for each sub-configuration. When applying Framework #3 method, if the number of A1 APs (or P1 / P2 power values) is set for CSI-RS index #n1 belonging to the resource set, the number of A1 APs (or P1 power values) will be linked to sub-configuration index #s1, and the number of A2 APs (or P2 power values) which are less than the number of A1 APs that make up CSI-RS index #n1 will be linked to sub-configuration index #s2. This allows different spatial domain adaptation patterns to be set for each sub-configuration.

[0293] Furthermore, a power domain adaptation pattern can mean that the power offset value (e.g., the powerControlOffset parameter, which is the power offset value between PDSCH and CSI-RS, and the powerControlOffsetSS parameter, which is the power offset value between SSS and CSI-RS, etc., are determined by these parameters) is varied. For example, when applying framework #2, a P1 power value can be set for CSI-RS index #n1 belonging to the resource set, and a P2 power value can be set for CSI-RS index #n2 belonging to the same resource set. In this case, by setting sub-configuration index #s1 to be linked to CSI-RS index #n1 and sub-configuration index #s2 to be linked to CSI-RS index #n2, different power domain adaptation patterns can be set for each sub-configuration.

[0294] Furthermore, when applying Framework #3, P1 power values ​​and P2 power values ​​can be set for CSI-RS index #n1 belonging to the resource set. In this case, by setting the sub-configuration index #s1 to be linked to the P1 power value and the sub-configuration index #s2 to be linked to the P2 power value, different power domain adaptation patterns can be set for each sub-configuration.

[0295] By utilizing one of the aforementioned options #1 / 2 / 3, the terminal can feed back a CSI report to the base station that includes CSIs (ar) corresponding to N sub-settings (ar) that are between 1 and L out of L sub-settings.

[0296] This disclosure proposes a method for configuring some or all of the CSI-RS resources within a single CSI-RS resource set to a number of APs in the CSI Framework #3. Once the CSI-RS resources and corresponding number of APs corresponding to each sub-configuration are determined via the proposed technique, a CSI can be generated using the CSI-RS resources and corresponding number of APs included in the sub-configuration when a CSI report including that sub-configuration is configured / instructed.

[0297] Each sub-setting within the CSI reporting settings (e.g., CSI-ReportConfig) can be linked using methods such as Alt#A-1 / B-1 / C-1, as described later.

[0298] *Alt#A-1) Information on whether the number of APs set for each CSI-RS resource is the whole or a subset, and if it is a subset, information on what AP indices it consists of (hereinafter referred to as "port subset indication"). For example, for a CSI-ReportConfig setting linked to a resource set consisting of 32-port CSI-RS resources, sub-setting #1 can be linked to the entire 32-port, and sub-setting #2 can be linked to only the 16-port consisting of even indices. Such port subset indications can utilize the signaling method disclosed in Example #2 below (e.g., bitmap).

[0299] *Alt#B-1) If the number of APs can be set in other parameters within each sub-configuration (e.g., codebookConfig) without a separate port subset directive, the number of APs set in the relevant parameter will be linked, and in this case, the AP index that constitutes the relevant number of APs can be defined in advance.

[0300] *Alt#C-1) As a hybrid method of Alt#A-1 and Alt#B-1, the number of APs is implicitly set via the Alt#B-1 method, and the AP index that constitutes the corresponding AP can be set separately within each sub-configuration. For example, K entries can be pre-configured for a method that configures 16 ports out of a 32-port resource. That is, the first entry can consist of 16 odd-indexed ports, the second entry of 16 even-indexed ports, the third entry of the top 16 ports, the fourth entry of the bottom 16 ports, and so on. Which entry is used to configure the ports can be set separately within the sub-configuration via a parameter. As shown in Figure 20, a single resource set consists only of CSI-RS resources with the number of A1 APs, and via the port subset indicator, all A1 AP counts can be linked in sub-configuration #1, and fewer A2 AP counts than A1 can be linked in sub-configuration #2.

[0301] As described in Framework #3 above, if there is a single CSI-RS resource set linked to a single CMR or a single IMR within a single CSI reporting configuration (e.g., CSI-ReportConfig), some or all of the CSI-RS resources within that CSI-RS resource set can be set / instructed to multiple AP values. For example, CSI-RS resource #1 belonging to a CSI-RS resource set can be set to a maximum of 32 APs, some of which can be configured / instructed to perform CSI reporting using 16 and / or 8 APs. In this case, this disclosure aims to propose specific AP mapping and codebook construction schemes for the CSI reporting corresponding to the CSI reporting configuration.

[0302] CSI-RS AP Mapping

[0303] Table 13 below shows the structure of the configuration information for CSI-RS resource mapping as defined in the TS 38.331 standard document.

[0304] [Table 13]

[0305] Table 14 below is a table relating to the position of the CSI-RS within the slot as defined in the TS 38.211 standard document.

[0306] [Table 14] JPEG2026513927000023.jpg155168

[0307] The combination of the RRC parameters included in the configuration information in Table 13 and the table in Table 14 allows for the determination of the AP mapping method for CSI-RS. Currently, the NR standard supports a total of 18 patterns (e.g., rows 1 through 18 in the table in Table 14), and examples of AP mapping for each pattern are explained below with reference to the diagram.

[0308] Figures 21a to 21r show examples of AP mapping of CSI-RS using various patterns applicable to this disclosure. In Figures 21a to 21r, the horizontal axis of the grid structure, from 0 to 13, represents OFDM symbol indices, and the vertical axis of the grid structure, from 0 to 11, represents RE or subcarrier indices within a single RB.

[0309] Figure 21a shows an example of CSI-RS AP mapping using the first pattern. Figure 21a illustrates the case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b3...b0] in the TS 38.211 specification) is set to 0010, i.e., the l0 value is set to 3 and the k0 value is set to 1. In Figure 21a, CSI-RS AP number 3000 is mapped to RE represented by "0".

[0310] Figure 21b shows an example of AP mapping of CSI-RS using the second pattern. Figure 21b shows the firstOFDMSymbolInTimeDomain parameter set to 3 and the frequencyDomainAllocation parameter (e.g., bitmap of TS 38.211 specification [b 11 ...b0) The parameter corresponding to this is set to 0000 0000 0010, that is, the l0 value is set to 3 and the k0 value is set to 1. In Figure 21b, the RE indicated by "0" is mapped to CSI-RS AP number 3000.

[0311] Figure 21c shows an example of CSI-RS AP mapping using the third pattern. Figure 21c illustrates the case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 000010, i.e., the l0 value is set to 3 and the k0 value is set to 2. In Figure 21c, two APs are CDM'd by applying the frequency axis OCC (orthogonal cover code) to the RE-group (group) or CDM (code domain multiplexing) group indicated by "0", and CSI-RS APs 3000 and 3001 are mapped.

[0312] Figure 21d shows an example of CSI-RS AP mapping using the fourth pattern. Figure 21d illustrates the case where the firstOFDMSymbolInTimeDomain parameter is set to 3 and the frequencyDomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b2...b0] in the TS 38.211 specification) is set to 001, i.e., the l0 value is set to 3 and the k0 value is set to 0. In Figure 21d, two APs are CDM-mapped to each of the RE-groups or CDM groups indicated by "0" or "1" by applying frequency axis OCC, so that CSI-RS APs 3000 and 3001 are mapped to CDM group 0, and CSI-RS APs 3002 and 3003 are mapped to CDM group 1.

[0313] Figure 21e shows an example of CSI-RS AP mapping using the fifth pattern. Figure 21e illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 000010, i.e., the l0 value is set to 3 and the k0 value is set to 2. In Figure 21e, two APs are CDM-mapped to each RE-group or CDM group indicated by "0" or "1" by applying frequency axis OCC, so that CSI-RS APs 3000 and 3001 are mapped to CDM group 0, and CSI-RS APs 3002 and 3003 are mapped to CDM group 1.

[0314] Figure 21f shows an example of AP mapping for CSI-RS using the sixth pattern. Figure 21f illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 101101, i.e., the l0 value is 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 4, 6, and 10, respectively. In Figure 21f, two APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", or "3" by applying frequency axis OCC. As a result, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, and CSI-RS APs 3006 and 3007 are mapped to CDM group 3.

[0315] Figure 21g shows an example of AP mapping for CSI-RS using the seventh pattern. Figure 21g illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 010001, i.e., the l0 value is 3 and the values ​​of k0 and k1 are set to 0 and 8, respectively. In Figure 21g, two APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", or "3" by applying frequency axis OCC. As a result, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, and CSI-RS APs 3006 and 3007 are mapped to CDM group 3.

[0316] Figure 21h shows an example of CSI-RS AP mapping using the eighth pattern. Figure 21h illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 010001, i.e., the l0 value is 3 and the values ​​of k0 and k1 are set to 0 and 8, respectively. In Figure 21h, four APs are CDM-mapped to each of the RE-groups or CDM groups indicated by "0" or "2" by applying frequency axis OCC, so that CSI-RS APs 3000 through 3003 are mapped to CDM group 0, and CSI-RS APs 3004 and 3007 are mapped to CDM group 1.

[0317] Figure 21i shows an example of AP mapping for CSI-RS using the ninth pattern. Figure 21i illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 111111, i.e., the l0 value is 3 and the values ​​of k0, k1, k2, k3, k4, and k5 are set to 0, 2, 4, 6, and 8, respectively. In Figure 21i, two APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", "3", "4", or "5" by applying frequency axis OCC. As a result, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5.

[0318] Figure 21j shows an example of CSI-RS AP mapping using the 10th pattern. Figure 21j illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 010101, i.e., the l0 value is 3 and the values ​​of k0, k1, and k2 are set to 0, 4, and 8, respectively. In Figure 21j, four APs are CDM-mapped to each of the RE-groups or CDM groups indicated by "0", "1", or "2" by applying frequency axis OCC. As a result, CSI-RS APs 3000 through 3003 are mapped to CDM group 0, CSI-RS APs 3004 through 3007 are mapped to CDM group 1, and CSI-RS APs 3008 through 3011 are mapped to CDM group 2.

[0319] Figure 21k shows an example of AP mapping for CSI-RS using the 11th pattern. Figure 21k illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 101011, i.e., the l0 value is 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In Figure 21k, four APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", "3", "4", "5", "6", or "7" by applying frequency axis OCC. As a result, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, CSI-RS APs 3010 and 3011 are mapped to CDM group 5, and CSI-RS APs 3012 and 3013 are mapped to CDM group 6. The APs are mapped, and CSI-RS APs 3014 and 3015 are mapped to CDM group 7.

[0320] Figure 21l shows an example of AP mapping for CSI-RS using the 12th pattern. Figure 21l illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 101011, i.e., the l0 value is 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In Figure 21l, four APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", or "3" by applying frequency axis OCC. As a result, CSI-RS APs 3000 through 3003 are mapped to CDM group 0, CSI-RS APs 3004 through 3007 are mapped to CDM group 1, CSI-RS APs 3008 through 3011 are mapped to CDM group 2, and CSI-RS APs 3012 through 3015 are mapped to CDM group 3.

[0321] Figure 21m shows an example of AP mapping for CSI-RS using the 13th pattern. Figure 21m illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 100011, i.e., the l0 value is 3, the l1 value is 10, and the values ​​of k0, k1, and k2 are set to 0, 8, and 10, respectively. In Figure 21m, two APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", or "11" by applying frequency axis OCC. As a result, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5. The APs are mapped, with CSI-RS APs 3012 and 3013 mapped to CDM group 6, CSI-RS APs 3014 and 3015 mapped to CDM group 7, CSI-RS APs 3016 and 3017 mapped to CDM group 8, CSI-RS APs 3018 and 3019 mapped to CDM group 9, CSI-RS APs 3020 and 3021 mapped to CDM group 10, and CSI-RS APs 3022 and 3023 mapped to CDM group 11.

[0322] Figure 21n shows an example of AP mapping for CSI-RS using the 14th pattern. Figure 21n illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 100011, i.e., the l0 value is 3, the l1 value is 10, and the values ​​of k0, k1, and k2 are set to 0, 2, and 10, respectively. In Figure 21n, four APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", "3", "4", or "5" by applying frequency axis OCC. As a result, CSI-RS APs 3000 through 3003 are mapped to CDM group 0, CSI-RS APs 3004 through 3007 are mapped to CDM group 1, CSI-RS APs 3008 through 3011 are mapped to CDM group 2, CSI-RS APs 3012 through 3015 are mapped to CDM group 3, CSI-RS APs 3016 through 3019 are mapped to CDM group 4, and CSI-RS APs 3020 through 3023 are mapped to CDM group 5.

[0323] Figure 21o shows an example of CSI-RS AP mapping using the 15th pattern. Figure 21o illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 001011, i.e., the l0 value is 3 and the values ​​of k0, k1, and k2 are set to 0, 2, and 6, respectively. In Figure 21o, eight APs are CDM-mapped to each of the RE-groups or CDM groups indicated by "0", "1", or "2" by applying frequency axis OCC. As a result, CSI-RS APs 3000 through 3007 are mapped to CDM group 0, CSI-RS APs 3008 through 3015 are mapped to CDM group 1, and CSI-RS APs 3016 through 3023 are mapped to CDM group 2.

[0324] Figure 21p shows an example of AP mapping for CSI-RS using the 13th pattern. Figure 21p illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 101011, i.e., the l0 value is 3, the l1 value is 10, and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively.In Figure 21p, two APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", or "15" by applying frequency axis OCC. As a result, CSI-RS APs 3000 and 3001 are mapped to CDM group 0, CSI-RS APs 3002 and 3003 are mapped to CDM group 1, CSI-RS APs 3004 and 3005 are mapped to CDM group 2, CSI-RS APs 3006 and 3007 are mapped to CDM group 3, CSI-RS APs 3008 and 3009 are mapped to CDM group 4, and CSI-RS APs 3010 and 3011 are mapped to CDM group 5. APs are mapped, with CSI-RS APs 3012 and 3013 mapped to CDM group 6, CSI-RS APs 3014 and 3015 mapped to CDM group 7, CSI-RS APs 3016 and 3017 mapped to CDM group 8, CSI-RS APs 3018 and 3019 mapped to CDM group 9, CSI-RS APs 3020 and 3021 mapped to CDM group 10, CSI-RS APs 3022 and 3023 mapped to CDM group 11, CSI-RS APs 3024 and 3025 mapped to CDM group 12, and CSI-RS APs 3026 and 3027 mapped to CDM group 13. The APs are mapped, with CSI-RS APs 3028 and 3029 mapped to CDM group 14, and CSI-RS APs 3030 and 3031 mapped to CDM group 15.

[0325] Figure 21q shows an example of AP mapping for CSI-RS using the 14th pattern. Figure 21q illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3, the firstOFDMSymbolInTimeDomain2 parameter is set to 10, and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 110011, i.e., the l0 value is 3, the l1 value is 10, and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 8, and 10, respectively. In Figure 21q, four APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", "3", "4", "5", "6", or "7" by applying frequency axis OCC. As a result, CSI-RS APs 3000 to 3003 are mapped to CDM group 0, CSI-RS APs 3004 to 3007 are mapped to CDM group 1, CSI-RS APs 3008 to 3011 are mapped to CDM group 2, CSI-RS APs 3012 to 3015 are mapped to CDM group 3, CSI-RS APs 3016 to 3019 are mapped to CDM group 4, CSI-RS APs 3020 to 3023 are mapped to CDM group 5, and CSI-RS APs 3024 to 3027 are mapped to CDM group 6. The APs are mapped, and CSI-RS APs 3028 through 3031 are mapped to CDM group 7.

[0326] Figure 21r shows an example of AP mapping for CSI-RS using the 15th pattern. Figure 21r illustrates the case where the firstOFEMSymbolInTimeEomain parameter is set to 3 and the frequencyEomainAllocation parameter (e.g., the parameter corresponding to the bitmap [b5...b0] in the TS 38.211 specification) is set to 101011, i.e., the l0 value is 3 and the values ​​of k0, k1, k2, and k3 are set to 0, 2, 6, and 10, respectively. In Figure 21r, eight APs are CDM-mapped to each of the RE-groups or CDM groups labeled "0", "1", "2", or "3" by applying frequency axis OCC. As a result, CSI-RS APs 3000 through 3007 are mapped to CDM group 0, CSI-RS APs 3008 through 3015 are mapped to CDM group 1, CSI-RS APs 3016 through 3023 are mapped to CDM group 2, and CSI-RS APs 3024 through 3031 are mapped to CDM group 3.

[0327] Port layout for codebook configuration

[0328] One of the pieces of information that constitutes CSI feedback in an NR system is the PMI (precoder matrix index). Various types of codebooks are supported to define the PMI. Specifically, Type I single-panel codebooks, Type I multi-panel codebooks, Type II codebooks, enhanced Type II codebooks, Type II port selection codebooks, and further enhanced or enhanced Type II port selection codebooks can be supported. Type I codebooks are designed for single-user MIMO transmissions, and Type II codebooks are designed for multi-user MIMO transmissions. In the configuration of a MIMO codebook, the assumed port layout is an (N1, N2) structure as shown in Figure 22. Figure 22 shows an example of a port layout for the configuration of a MIMO codebook applicable to this disclosure. If a base station has multiple Ng panels, the (N1, N2) structure as shown in Figure 22 is repeated for each panel. On the other hand, the number of CSI-RS APs in a (N1, N2) structure or a (Ng, N1, N2) structure is 2 × N1 × N2 or 2 × Ng × N1 × N2. For example, the number of CSI-RS APs in a port layout of (N1, N2) = (4, 2) is 16.

[0329] Specifically, the NR standard (e.g., TS 38.214, 5.2.2.2.1) defines the combinations of (N1, N2) for a single panel as shown in Table 15 below. In the table below, O1 and O2 are the oversampling factors.

[0330] [Table 15]

[0331] Figures 23a to 23m show examples of port layouts with various combinations of N1 and N2 applicable to this disclosure. Figure 23a is (N1, N2)=(2, 1), Figure 23b is (N1, N2)=(2, 2), Figure 23c is (N1, N2)=(4, 1), Figure 23d is (N1, N2)=(3, 2), Figure 23e is (N1, N2)=(6, 1), Figure 23f is (N1, N2)=(4, 2), Figure 23g is (N1, N2)=(8, 1), Figure Figure 23h illustrates port mapping when (N1, N2) = (4, 3), Figure 23i shows (N1, N2) = (6, 2), Figure 23j shows (N1, N2) = (12, 1), Figure 23k shows (N1, N2) = (4, 4), Figure 23l shows (N1, N2) = (8, 2), and Figure 23m shows (N1, N2) = (16, 1). Referring to Figures 23a to 23m, the port layout when N1 is the same as or greater than N2 is defined. Port number X can correspond to port index 3000 + X.

[0332] Furthermore, for cases involving multiple panels, NR standards (e.g., TS 38.214, 5.2.2.2.2) define combinations of (Ng, N1, N2) as shown in Table 16 below.

[0333] [Table 16]

[0334] Figures 24a to 24h illustrate examples of port layouts with various combinations of Ng, N1, and N2 applicable to this disclosure. Figure 24a illustrates port mapping when (Ng, N1, N2) = (2, 2, 1), Figure 24b illustrates port mapping when (Ng, N1, N2) = (2, 4, 1), Figure 24c illustrates port mapping when (Ng, N1, N2) = (4, 2, 1), Figure 24d illustrates port mapping when (Ng, N1, N2) = (2, 2, 2), Figure 24e illustrates port mapping when (Ng, N1, N2) = (2, 8, 1), Figure 24f illustrates port mapping when (Ng, N1, N2) = (4, 4, 1), Figure 24g illustrates port mapping when (Ng, N1, N2) = (2, 4, 2), and Figure 24h illustrates port mapping when (Ng, N1, N2) = (4, 2, 2). Port number X can correspond to port index 3000+X.

[0335] According to the above-mentioned CSI framework, especially Framework #3, when the setting information for CSI reports (e.g., CSI-ReportConfig) is set for one CMR or one IMR to include one CSI-RS resource set that is linked, some or all of the CSI-RS resource(s) within the corresponding set can be set to a plurality of AP count values and / or power offset values, etc. In this case, one CSI-RS resource can be set for a maximum of N1 (e.g., N1 = 32) APs, and CSI reports using a part of N2 (<N1) of these APs (e.g., N2 = 16 or 8) can be set. In such a situation, the present disclosure first attempts to propose a technique for setting / indicating which of the N2 or N1 APs out of the N1 APs are used for CSI reports.

[0336] Figures 25a and 25b show examples of port layouts for an 8-port AP applicable to the present disclosure and variations of port layouts for AP subsets. For example, as shown in Figure 21g, when an 8-port CSI-RS is set and (N1, N2) = (2, 2), a port layout like that in Figure 25a can be applied. If the APs corresponding to CDM group #1 and CDM group #3 among the corresponding CSI-RS are muted and CSI reports can be set with the remaining 4 APs, the port layout corresponding to the remaining 4 APs is as shown in Figure 25b. However, since such a port layout is not defined in the current table for codebook configuration (e.g., Table 15), it is difficult to configure a codebook for calculating PMI using the remaining 4 APs.

[0337]

[0338] Therefore, the present disclosure attempts to propose embodiments for CSI-RS AP mapping and efficient codebook configuration to support PMI reports when setting CSI reports by muting some of the CSI-RS APs.

[0339] In this disclosure, " / " means "and," "or," or "and / or" depending on the context. Also, in the following explanation, the expression "the AP transmits" can be understood as "a signal (e.g., CSI-RS) is transmitted through that AP at the resource in question," or "the AP is used to transmit a signal at the resource in question."

[0340] Figure 26 illustrates an example of a procedure for reporting a CSI for sub-configuration according to one embodiment of the present disclosure. Figure 26 illustrates how this is performed by a terminal.

[0341] Referring to Figure 26, in step S2601, the terminal receives configuration information for the CSI report. The configuration information may include information related to the CSI-RS resource or resource set, the number of APs, power offset, etc., associated with the CSI report. The configuration information may also include multiple sub-configurations, and each sub-configuration may be associated with at least one of the following different AP counts, AP subsets, or power offset values.

[0342] In step S2603, the terminal checks AP subset information for each sub-configuration. The configuration information received from the base station may include AP subset information for each sub-configuration. Specifically, the configuration information received from the base station may include a catalog of multiple sub-configurations, and each sub-configuration may include different AP subsets. That is, a sub-configuration can be associated with information about AP subsets. Therefore, the terminal can use bitmap information to check the AP subsets applied to the relevant sub-configuration, i.e., the indices of the APs that are turned on and / or the APs that are turned off. For example, AP subsets can be represented in bitmap format.

[0343] In step S2605, the terminal generates a CSI based on the AP subset. Here, the CSI may include a PMI (precoding matrix indicator). To determine the PMI, a codebook selection is required, and the codebook is selected based on the AP layout. Thus, the terminal can determine the AP layout of the AP subset based on configured or predefined rules, select a codebook based on the determined layout, and determine the PMI based on the selected codebook. For this purpose, although not shown in Figure 26, the terminal can obtain or verify restriction information for codebook-related parameters (e.g., N1, N2, Ng, etc.) corresponding to the AP subset. Also, although not shown in Figure 26, the terminal can receive at least one CSI-RS via a CSI-RS resource linked to the configuration information for the CSI report, measure the channel or interference using the received CSI-RS, and determine the PMI based on the measurement results and the codebook. This allows the terminal to generate a CSI that includes PMIs for each sub-configuration.

[0344] In step S2607, the terminal sends a CSI report that includes the CSI. In other words, the terminal feeds back the CSI for each sub-configuration to the base station. That is, the terminal sends the CSI report using the resources indicated by the configuration information for the CSI report. Here, the CSI report can be sent in one message or multiple messages.

[0345] Figure 27 illustrates an example of the procedure for receiving a CSI for subconfiguration according to one embodiment of the present disclosure. Figure 27 illustrates how this is performed by a base station.

[0346] Referring to Figure 27, in step S2701, the base station generates AP subset information for each sub-configuration. When providing settings related to CSI reporting, the base station can provide multiple sub-configurations for a single CSI-RS resource or CSI-RS resource set. In this case, the sub-configuration can be distinguished by at least one of the following: number of APs, AP subsets, and power offset. For example, the base station can generate AP subset information for each sub-configuration, representing the AP subsets in the form of a bitmap.

[0347] In step S2703, the terminal transmits configuration information for the CSI report. The configuration information may include information related to the CSI-RS resource or resource set, the number of APs, power offset, etc., associated with the CSI report. The configuration information may also include multiple sub-configurations, and each sub-configuration may be associated with at least one of the following different AP counts, AP subsets, or power offset values. In this case, the configuration information may include AP subset information for each sub-configuration generated in step S2701.

[0348] In step S2705, the terminal generates a CSI based on the AP subset. Here, the CSI may include a PMI (precoding matrix indicator). To determine the PMI, a codebook selection is required, and the codebook is selected based on the AP layout. Thus, the terminal can determine the AP layout of the AP subset based on configured or predefined rules, select a codebook based on the determined layout, and determine the PMI based on the selected codebook. For this purpose, although not shown in Figure 27, the terminal can receive at least one CSI-RS via a CSI-RS resource linked to configuration information for the CSI report, measure the channel or interference using the received CSI-RS, and determine the PMI based on the measurement results and the codebook. This allows the terminal to generate a CSI that includes PMIs for each sub-configuration.

[0349] In step S2705, the base station receives a CSI report containing CSIs generated based on the AP subset. In other words, the base station receives CSIs from the terminals for each sub-configuration.

[0350] For this purpose, although not shown in Figure 27, the base station can transmit at least one CSI-RS via a CSI-RS resource linked to the configuration information for the CSI report. The base station can then receive the CSI report using the resource indicated by the configuration information for the CSI report. Here, each CSI may contain a PMI. To parse the PMI, a codebook selection is required, and the codebook is selected based on the AP layout. Thus, the base station can determine the AP layout of an AP subset based on configured or predefined rules, select a codebook based on the determined layout, and parse the PMI based on the selected codebook.

[0351] As explained with reference to Figures 26 and 27, CSIs can be generated and transmitted for sub-configurations linked to AP subsets. Hereinafter, this disclosure proposes embodiments for signaling to AP subsets, CSI generation based on AP subsets, etc., which can be applied to the procedure illustrated in Figure 26.

[0352] [Example #1] Signaling scheme for base station AP on / off, AP muting pattern, or port subset indication

[0353] This embodiment relates to a technique for saving base station energy by adjusting the on / off state of some of the N1 APs in a CSI-RS resource or CSI-RS resource set. Specifically, at least one of the following instruction methods can be executed via DCI and / or MAC CE.

[0354] Furthermore, upon receiving a DCI or MAC CE that instructs switching between groups, configuration indices, bitmap information, or AP counts, or directly instructs bitmap information, the terminal can execute the instructed switching operation after a certain application delay. For example, from the moment the DCI or MAC CE is received, the terminal can execute the instructed switching operation from a predefined / configured or reported UE capability signaling K1 symbol, slot, or msec later, or from the nearest slot or slot-group boundary thereafter. As another example, from the moment the MAC CE or DCI is received and the corresponding HARQ-ACK feedback is sent, the terminal can execute the instructed switching operation from a predefined / configured or reported UE capability signaling K2 msec, symbol, or slot later, or from the nearest slot or slot-group boundary thereafter.

[0355] In addition to the signaling described below, a timer / duration and / or a time axis pattern indicator for whether a corresponding instruction is applied during a certain period of time can be set / instructed together via DCI and / or MAC CE, or by prior setting / definition. For example, in relation to the timer / duration, from a reference time point such as DCI reception or HARQ-ACK corresponding to MAC CE, the corresponding instruction is applied between T1 slots and T2 slots, so that fewer than N1 APs are used for transmission, and thereafter, it can be instructed that N1 APs are used for transmission. For example, in relation to the time axis pattern indicator, by applying the corresponding instruction during T2 slots, it can be instructed that fewer than N1 APs are used for transmission, and N1 APs are used for transmission during T3 slots, and the T2 / T3 slot pattern is repeated. As another example, in relation to the time axis pattern indicator, N1 APs can be used for transmission in even-index slots, and fewer than N1 APs can be used for transmission in odd-index slots.

[0356] (1) On / off for each AP or each AP group can be indicated via a bitmap. For example, on / off for each AP can be controlled via an N1-bit bitmap. As another example, considering signaling overhead, on / off of APs can be controlled via an X (<N1)-bit bitmap, and the index of the AP(s) associated with each bit can be set in advance or determined by a rule. For example, by prior setting or rule, when X = 2, the first bit can be mapped to an even index, and the second bit can be mapped to an odd index. As another example, by prior setting or rule, the first bit can be mapped to APs with {N1 / 2} or less, and the second bit can be mapped to other APs.

[0357] Each bit of the X-bit bitmap can correspond to one or more CDM groups illustrated in FIGS. 21a to 21r described above. For example, as shown in FIG. 21g, when an 8-port CSI-RS is set, the corresponding bitmap is composed of 4 bits, and each bit can be linked to one of the 4 CDM groups. When bitmap information is set to "1010", it is assumed that the AP indexes 3000 / 3001 / 3004 / 3005 belonging to CDM groups 0 / 2 are in the on state, and the AP indexes 3002 / 3003 / 3006 / 3007 belonging to CDM groups 1 / 3 are in the off state, and the terminal can transmit a CSI report for the on-state APs.

[0358] (2) On / off can be indicated via an N3-bit field, 2 ∧ (N3) or 2 ∧ (N3-1) exceeding, 2 ∧ (N3) For each of the following code points, it can be pre-set which index(es) of the AP(s) are turned on / off. In other words, the on / off information of K APs or the information on which AP index to construct a CSI report based on is pre-set, and the on / off or the AP index(es) required for the configuration related to the CSI report can be indicated via a field composed of ceiling{log2(K)} bits. Or, the on / off information of K APs or the information on which AP index to construct a CSI report based on is pre-set, and the on / off or the AP index(es) required for the configuration related to the CSI report can be indicated via a field composed of a K-bit bitmap. Here, the on / off information of K APs or the AP index(es) required for the configuration related to the CSI report can specifically include the N1 (e.g., the number or the maximum number of APs of the corresponding CSI-RS) or X (<N1) bit bitmap information.

[0359] On one hand, for N1-bit or X-bit bitmap information, when N2 (<N1)-ports are additionally configured in the corresponding N1-port CSI-RS resource configuration, N1-bit or X-bit bitmap information can be corresponded to each N2-port information. For example, as shown in FIG. 21g, when 8-port CSI-RS is configured, the corresponding bitmap is composed of 4 bits, and each bit can be linked to one of 4 CDM groups. Additionally, when the number of APs such as 4 APs and 2 APs is added to the corresponding CSI-RS resource or CSI-RS resource set configuration, when it is 4-port, bitmap information of "1010" can be linked, and when it is 2-port, bitmap information of "1000" can be linked. As another example, as shown in FIG. 21g, when 8-port CSI-RS is configured, the corresponding bitmap is composed of 4 bits, and each bit can be linked to one of 4 CDM groups. In this case, in addition to the bitmap information of "1111", bitmap information of "1010" meaning 4-port and "1000" meaning 2-port can be set in advance in the corresponding CSI-RS resource configuration or CSI-RS resource set configuration. Therefore, by utilizing a 2-bit field or a 3-bit bitmap field via DCI or MAC-CE, it can be indicated whether to transmit CSI reports corresponding to some APs among 8-port, 4-port, and 2-port, or which bitmap information among "1111", "1010", or "1000" to apply to transmit the corresponding CSI report.

[0360] If at least one sub-configuration can be set for the settings related to CSI reporting, the signaling method described above can be used for port subset indication. As shown in the example in Figure 20, sub-configuration #1 can be linked to the number of A1 APs, and sub-configuration #2 can be linked to the number of A2 APs. In this case, a bitmap (e.g., a 32-bit bitmap or an X-bit bitmap, where each bit is mapped to one or more AP indices according to a predetermined rule) can be set for each sub-configuration for port subset indication of sub-configuration #1 / sub-configuration #2.

[0361] Alternatively, Y-bit information can be used to represent port subset instructions for each sub-configuration, 2 ∧ (Y) or 2 ∧ (Y-1) Excess, 2 ∧ (Y) For each of the following code points, it can be pre-configured or predefined in the standard which index AP(s) will be turned on / off. Here, the Y-bit information can include Alt1) the number of APs and indexing information, or Alt2) only the indexing information, with separate information configured for each number of APs. For Alt2, for example, Y1-bit information for 16 ports and Y2-bit information for 8 ports can be pre-configured or predefined in the standard. For sub-configuration #n, if the terminal can recognize that the number of APs supported via other parameters (e.g., codebookConfig) is 16, the terminal can know which 16 APs will be turned on by setting additional Y1-bit information within the corresponding sub-configuration. Similarly, for sub-configuration #k, if the terminal can recognize that the number of APs supported via other parameters (e.g., codebookConfig) is 8, the terminal can know which 8 APs will be turned on by setting additional Y2-bit information within the corresponding sub-configuration.

[0362] In the method described above, when a specific AP is turned on, it can be said that when the terminal performs CSI reporting, it will only report CSI information (e.g., RI, PMI, CQI, etc.) corresponding to the AP that is turned on. For this reason, the codebook-related configuration information (e.g., codebookConfig) corresponding to the relevant CSI-RS resource or CSI-RS resource set must be set individually for all candidate APs that can be turned on. For example, by turning a certain number of APs on or off using the method described above, three different codebookConfigs can be individually set for the relevant CSI-RS resource or CSI-RS resource set that can have N1, N2, or N3 APs turned on. This means that the codebook subset restriction and / or RI restriction can be set differently depending on the number of APs. Therefore, when a terminal receives a signal that only N2 APs are turned on for a given CSI-RS resource or CSI-RS resource set as instructed by the proposed technology, the terminal can calculate the CSI corresponding to the given CSI-RS resource or CSI-RS resource set based on the codebookConfig settings corresponding to the N2 APs, and report the calculated CSI information to the base station. The CSI information, particularly the CSI Part 1 information, may include information indicating whether it is a CSI report corresponding to a certain number of APs, and this information may be the aforementioned bitmap information, or it may indicate which of the K pre-configured AP on / off information (e.g., AP number information, bitmap information, etc.) it is.

[0363] This embodiment #1 relates to on / off signaling for APs, but can be extended to on / off signaling for panels or TRPs.

[0364] [Example #2] CSI-RS resource configuration method for base station APs via on / off, muting pattern, or port subset instruction

[0365] If only some of the multiple APs belonging to a CDM group are turned off, the CSI-RS resources can be reduced by considering the number of OCCs corresponding to the on APs and the time / frequency axis dimensions. Table 17 shows the CSI-RS resource mapping details excerpted from the TS 38.211 v17.4.0 standard document.

[0366] [Table 17] JPEG2026513927000027.jpg240169JPEG2026513927000028.jpg141167

[0367] As can be seen in Table 17, the sequence index s determines the AP index order within a single CDM group, as confirmed by the formula for determining the AP index p, namely p = 3000 + s + j × L. The order of the corresponding sequence index s is determined by Tables 7.4.1.5.3-2 to 7.4.1.5.3-5 in Table 17.

[0368] For example, as shown in Figure 21q above, when cdm4-FD2-TD2 is applied to a 32-port CSI-RS, AP indices 3000 / 3001 / 3002 / 3003 sent to CDM group 0 can correspond to indices 0 / 1 / 2 / 3 in Table 7.4.1.5.3-4 of Table 17, respectively. If AP indices 3002 / 3003 are turned off and AP indices 3000 / 3001 are turned on, or vice versa, the time-axis OCC is the same, and only the frequency-axis OCC is orthogonal. In this case, only one symbol is sufficient for the time-axis resource corresponding to the CDM group #0, instead of two symbols. By utilizing this, if, among AP indices n+2 / n+3 present in a single CDM group, AP indices n+2 / n+3 are turned off and AP indices n / n+1 are turned on, or conversely, among AP indices n+2 / n+3, AP indices n+2 / n+3 are turned on and AP indices n / n+1 are turned off, the two symbols of the time-axis resource corresponding to that CDM group can be replaced with one symbol. Figures 28a and 28b show an example of AP mapping of CSI-RS based on on / off for each CDM group according to one embodiment of the present disclosure. As shown in Figure 28a, the base station can transmit CSI-RS consisting of the remaining 16 ports via two symbols such as symbol #3 and symbol #10, and the terminal can transmit a CSI report. Alternatively, to minimize the time the base station turns on RF for CSI-RS transmission, the interval between transmission symbols can be narrowed, as shown in Figure 28b, so that the base station transmits CSI-RS consisting of the remaining 16 ports via two symbols such as symbol #3 and symbol #4, and the terminal can transmit a CSI report.

[0369] As described above, the method of reducing some time-axis and / or frequency-axis resources of a CDM group by utilizing the OCC characteristics of the remaining CSI-RS ports within the same CDM group can also be applied to other AP counts and / or other CDM types. For example, when fd-CDM2 is applied, if one AP among AP index n / n+1 in a single CDM group is turned off, only one of the two REs corresponding to that CDM group will transmit an on-state AP, and the remaining RE will not have a CSI-RS AP mapped to it. As another example, when cdm8-FD2-TD4 is applied, if AP indices n+4 / n+5 / n+6 / n+7 are turned off and AP indices n / n+1 / n+2 / n+3 are turned on, then two of the four symbols corresponding to that CDM group will transmit APs in the on state, and the remaining symbols will not map CSI-RS APs.

[0370] As described above, only some APs within a single CDM group can be turned off, but it is also possible for all APs belonging to a CDM group to be turned off. As previously stated, even if only some APs are turned off, a change occurs in the time / frequency axis resources corresponding to the CDM group, or if the entire CDM group is turned off and the resources allocated to the CDM group are not used as CSI-RS, then using the remaining resources for other DL transmissions (e.g., PDSCH transmissions) from the base station's perspective can contribute to increasing system efficiency. To efficiently realize this, a set of separate rate matching patterns can be linked by the CSI-RS muting pattern or AP on / off pattern. For example, if information related to K AP on / off patterns or information related to what AP index constitutes the CSI report can be pre-configured, as in Example #1, then a set of rate matching patterns can be linked to each pattern or each index combination. If K=2, then set #1 of rate matching patterns corresponding to the information related to the first AP on / off pattern can be configured, and set #2 of rate matching patterns corresponding to the information related to the second AP on / off pattern can be configured. If information related to the first AP on / off pattern is indicated via DCI or MAC-CE, the terminal can assume that the rate matching pattern included in set #1 is valid and receive PDSCH. In this case, for REs indicated as rate matching patterns, the terminal can determine that the corresponding RE is not available for PDSCH reception. Furthermore, the fact that a rate matching pattern included in a particular set is valid means that if the rate matching pattern is configured solely by RRC signaling, the terminal can consider that pattern for PDSCH reception.Alternatively, if the rate matching pattern is set via DCI instruction, the terminal receiving the DCI instruction can assume that only rate matching patterns included in that set can be instructed via DCI.

[0371] [Example #3] Mapping method for physical resources in CSI-RS

[0372] According to the formula in Table 17, namely p = 3000 + s + j × L, AP indexing is performed in a manner that, after indexing all APs belonging to a particular CDM group is completed, indexing is performed for APs belonging to the next CDM group. In this manner, after some APs have been muted, it may be difficult to reuse the existing codebook with only the remaining APs. Therefore, this disclosure aims to propose a new AP indexing method. The specific formula is p = 3000 + s × N / L + j, where the definitions of s, N, L, and j are the same as in Table 17. That is, s is the sequence index provided by Tables 7.4.1.5.3-2 to 7.4.1.5.3-5, L is the CDM group size, which is 1, 2, 4, or 8, and N is the number of CSI-RS ports. The CDM group index j given in Table 7.4.1.5.3-1 corresponds to the time / frequency position (k, l) for a given row in Table 7.4.1.5.3-1. CDM groups are numbered in order of increasing frequency domain allocation first and then increasing time domain allocation. In this mapping scheme, indexing is performed for one AP belonging to a particular CDM group, and then for one AP belonging to the next CDM group, and this process is repeated. Applying the mapping scheme described above to Figure 21g yields the result shown in Figure 29a.

[0373] Figures 29a and 29b show an example of CSI-RS AP mapping and port layout based on frequency domain and time domain priority allocation according to one embodiment of the present disclosure. Referring to Figure 29a, in each of the RE-groups or CDM groups indicated by "0", "1", "2", or "3", two APs are CDM-mapped by applying frequency axis OCC, with CSI-RS APs 3000 and 3004 mapped to CDM group 0, CSI-RS APs 3001 and 3005 mapped to CDM group 1, CSI-RS APs 3002 and 3006 mapped to CDM group 2, and CSI-RS APs 3003 and 3007 mapped to CDM group 3. In this case, the AP mapping for the codebook configuration is as shown in Figure 29b when (N1, N2) = (2, 2).

[0374] In the example in Figure 29a, if all APs belonging to CDM group #0 / 2 are turned off, the codebook will still have a (N1, N2) = (2, 1) structure even if only the remaining APs are used to configure the codebook. Therefore, there is an advantage in being able to reuse the structure supported by existing NR standards.

[0375] The new AP mapping method proposed in this embodiment can be advantageous or disadvantageous depending on factors such as coexistence with existing terminals, whether single or multiple panels are supported, and the maximum number of APs. Therefore, when a base station configures a specific CSI-RS resource, it can additionally configure whether to apply an existing mapping method or the new mapping method proposed by the proposed technology. Alternatively, the mapping method can be determined by predefined rules. For example, rules can be defined so that when a codebook for a single panel is configured, the mapping method by the proposed technology is applied, and when a codebook for multiple panels is configured, the existing mapping method is applied. As another example, rules can be defined so that in the case of an N1-port (e.g., N1=32) CSI-RS, the existing mapping method is applied, and in the case of an N2-port (e.g., N2=16) CSI-RS, the mapping method by the proposed technology is applied.

[0376] [Example #4] CSI-RS AP indexing solution considering on / off, muting patterns, or port subset instructions for base station APs and codebook structure

[0377] If the number of APs in a CSI-RS resource or CSI-RS resource set corresponding to a particular CSI report can change due to signaling of on / off, muting patterns, or port subset instructions for APs at a base station, then configuration information related to the codebook configuration or codebook subset restriction corresponding to each number of APs is required (e.g., parameters such as n1-n2 for a single-panel type 1 codebook, ng-n1-n2 for a multi-panel type 1 codebook, and n1-n2-codebookSubsetRestriction for a type 2 codebook). Here, codebook subset restriction refers to a technique that reduces the complexity of PMI calculations for terminals by allowing the omission of PMI calculations related to some APs, mainly considering interference with adjacent cells. If the number of APs or the maximum number of APs for the CSI-RS resource or CSI-RS resource set corresponding to the relevant CSI report is 32, then for a single panel type 1 codebook, the four-four-TypeI-SinglePanel-Restriction parameter, i.e., (N1, N2) = (4, 4), can be set as 256-bit bitmap information. Additionally, if the relevant CSI-RS resource can be changed to 16 ports due to signaling related to on / off, muting patterns, or port subset instructions for APs, then assuming the same type of codebook, the four-two-TypeI-SinglePanel-Restriction parameter, i.e., (N1, N2) = (4, 2), can be set as 128-bit bitmap information. Alternatively, even if the number of APs per sub-configuration differs due to a configuration such as Framework #3, the bitmap information for codebook subset restriction can be provided as a single piece of information, taking into account the RRC signaling overhead.

[0378] As in the example above, the four-four-TypeI-SinglePanel-Restriction parameter, i.e., (N1, N2)=(4, 4), is set as 256-bit bitmap information, and 16 ports can be configured in other sub-configurations within the configuration for the same CSI report. Based on the AP layout and oversampling factor, the terminal can determine which bit information corresponds to which AP index for the relevant 256-bit information. Furthermore, since the terminal can determine which AP index is turned on via port subset instruction information, the terminal can extract codebook subset restriction information corresponding to the 16 ports based on the given 256-bit bitmap information. Based on the extracted information, the terminal can calculate PMI information for the sub-configuration corresponding to the 16 ports by performing codebook subset restriction.

[0379] As shown in Figure 21q, AP indexing for a (4,4) port layout when a 32-port CSI-RS is configured can be performed as shown in Figure 30a. If the 32-port CSI-RS is instructed to be OFF for CDM groups 2 / 3 / 6 / 7, the port layout composed of the remaining APs can be determined as shown in Figure 30b. However, the port layout composed of the remaining APs as shown in Figure 30b is (N1,N2)=(2,4), which is a structure not supported by the current NR standard. Therefore, this disclosure seeks to propose an embodiment for aligning the result of Figure 30b to the structure shown in Figure 23f, i.e., (N1,N2)=(4,2).

[0380] [Example #4-1] By arranging the remaining AP indices in ascending or descending order, a method can be applied to sequentially map them one-to-one with the indices on the port layout that constitute the codebook. For example, a terminal can calculate the PMI and report it to the base station, assuming that AP indices 0, 1, 2, 3, 4, 5, 6, 7, 16, 17, 18, 19, 20, 21, 22, and 23 in Figure 30b are sequentially mapped one-to-one with 0 through 15 in Figure 23f. That is, for APs included in the AP subset, in other words, APs in the on state, the indices are mapped in ascending order of the indices assigned in the overall set, starting with index 0. In other words, APs included in the AP subset are mapped to consecutive APs starting from the index starting value (e.g., 0) in ascending order of the indices assigned in the overall set. Here, index 0 can be understood as 3000+0.

[0381] Figure 31 illustrates an example of a procedure for mapping APs based on a subset of APs in a subconfiguration according to one embodiment of the present disclosure. Figure 31 illustrates how this is performed by a terminal.

[0382] Referring to Figure 31, in step S3101, the terminal checks the AP subset information. In order to generate a CSI for one of several sub-configurations, the terminal checks the information associated with the AP subset linked to the sub-configuration. The AP subset can be indicated in bitmap format, where each bit of the bitmap corresponds to an AP, and the position of a bit set to "1" means that the AP(s) used in that sub-configuration are turned on.

[0383] In step S3103, the terminal performs index mapping of APs indicated by the AP subset information. In other words, the terminal performs mapping between APs and AP numbers included in the AP subset. That is, it re-indexes the APs indicated by the AP subset information. The AP subset is a subset of APs associated with the relevant CSI report. Therefore, if the indexing result of the entire AP is used without modification, the APs in the AP subset may have discontinuous indices. Therefore, the terminal can re-map the indices to APs so that the APs in the AP subset have continuous indices. For example, for the derivation of PMI, antenna ports corresponding to all bits with a value of 1 in the bitmap are mapped to consecutive antenna ports starting at CSI-RS antenna port 3000 in increasing order of the bit position in the bitmap.

[0384] In step S3105, the terminal determines the PMI based on the AP subset. Based on the AP layout corresponding to the overall AP and the index mapping results of the AP subset, the terminal can determine the AP layout corresponding to the AP subset, select the codebook corresponding to the AP layout, and determine the PMI based on the selected codebook. For this purpose, although not shown in Figure 31, the terminal can receive CSI-RS from the base station.

[0385] As illustrated with reference to Figure 31, the terminal can determine the AP index for the AP indicated by the AP subset information. In this case, the base station must select the same codebook as the terminal in order to analyze the PMI received from the terminal, thereby enabling it to perform index mapping of the AP subset to the AP in the same manner.

[0386] [Example #4-2] A method can be applied to adjust the (N1, N2) combination by rotating the port layout composed of the remaining APs 90 degrees clockwise or counterclockwise. For example, by rotating the result shown in Figure 30b 90 degrees clockwise, the terminal can assume a (N1, N2) = (4, 2) port layout based on the AP index shown in Figure 30c, calculate the PMI, and report it to the base station. That is, the terminal can select a codebook and determine the PMI based on the port layout with modified N1 and N2, obtained by swapping the values ​​of N1 and N2 of the port layout of the remaining APs.

[0387] For multi-panel based codebook types, the aforementioned Examples #4-1 and #4-2 can be applied to each panel individually. Furthermore, Example #4 can be applied even after a new AP mapping method has been applied, as in Example #3.

[0388] Figure 32 illustrates an example of a procedure for transmitting a CSI report based on a sub-configuration according to one embodiment of the present disclosure. Figure 32 illustrates signal exchange between terminal 3210 and base station 3220.

[0389] Referring to Figure 32, in step S3201, base station 3220 transmits configuration information to terminal 3210 regarding codebook subset restrictions that depend on AP on / off or muting patterns. That is, multiple AP values ​​can be set for a CSI-RS resource or CSI-RS resource set linked to a specific CSI report. At this time, information related to the codebook subset restriction for each AP count can be set in advance.

[0390] In step S3203, base station 3220 transmits an indicator to terminal 3210 for AP on / off or muting patterns. For example, base station 3220 may transmit configuration information related to CSI reporting, and this configuration information may include information related to AP subsets as indicators for AP on / off or muting patterns.

[0391] In step S3205, terminal 3210 performs CSI AP remapping and PMI calculation. When a specific number of APs is instructed by base station 3220, terminal 3210 can determine the port layout corresponding to that number of APs. For example, terminal 3210 can determine the port layout according to embodiment #4. Then, terminal 3210 can modify AP indexing based on pre-configured codebook subset restriction information.

[0392] In step S3207, terminal 3210 reports the acquired PMI value. In other words, terminal 3210 sends a CSI report that includes the PMI value. Terminal 3210 can calculate the PMI value based on the port layout determined in step S3205 and send a CSI report that includes the corresponding PMI value to base station 3220.

[0393] This disclosure provides a mechanism that dynamically turns some APs on and off, taking into account the communication status and data volume with associated terminals, thereby reducing the power consumption of base stations. Furthermore, through AP indexing that takes into account AP on / off and codebook structure, the existing CSI calculation method can be reused even if some APs are turned off.

[0394] The proposed methods described above can be implemented independently, but they can also be implemented as a combination (or merger) of some of the proposed methods. Rules can be defined so that the base station informs the terminal of the applicability of the proposed method (or information regarding the rules of the proposed method) via a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0395] This disclosure can be embodied in other specific forms, provided that the technical ideas and essential features described herein do not deviate from those described herein. Therefore, the above detailed description should not be constrained in any way and should be considered illustrative. The scope of this disclosure shall be determined by a reasonable interpretation of the attached claims, and all modifications within the equivalent scope of this disclosure shall be included within the scope of this disclosure. Furthermore, examples may be formed by combining claims that are not explicitly referenced in the claims, or by including them as new claims through amendments made after filing.

[0396] [Industrial applicability] The embodiments of this disclosure can be applied to a variety of wireless connectivity systems. Examples of such systems include 3GPP (3rd Generation Partnership Project) or 3GPP2 systems.

[0397] The embodiments of this disclosure can be applied not only to the various wireless connection systems described above, but also to all technical fields that utilize such various wireless connection systems. Furthermore, the proposed method can also be applied to mmWave and THz communication systems using ultra-high frequency bands.

[0398] Additionally, the embodiments of this disclosure can be applied to a variety of applications, including autonomous vehicles and drones.

[0399] [Claims when filing an international application] [Claim 1] A method performed by a terminal (user equipment: UE) in a wireless communication system, A step to receive configuration information for a CSI (channel state information) report that includes at least one sub-configuration; A step of verifying information related to an antenna port subset associated with at least one of the aforementioned sub-settings; A step of generating a CSI for at least one sub-setting based on measurement results based on at least one CSI-RS related to the CSI report; and, The step of transmitting a CSI report including the CSI to a base station; The aforementioned CSI includes PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The antenna port index is determined by mapping the antenna ports to a continuous set of values, starting from the index's starting value, in ascending order of index within the overall set. [Claim 2] The method according to claim 1, wherein the antenna port subset is indicated using a bitmap. [Claim 3] The method according to claim 2, wherein each bit included in the bitmap corresponds to at least one antenna port or at least one code domain multiplexing (CDM) group. [Claim 4] The method according to claim 1, wherein the PMI is determined based on a codebook corresponding to the antenna port subset. [Claim 5] The method according to claim 1, wherein the PMI is determined based on the port layout with modified N1 and N2, obtained by alternating the values ​​of N1 and N2 of the port layout of the antenna port subset. [Claim 6] The method according to claim 1, wherein the subset of antenna ports includes on antenna ports, excluding off antenna ports. [Claim 7] The method according to claim 6, wherein the off-state antenna ports are determined on a CDM (code domain multiplexing) group basis. [Claim 8] The method according to claim 1, further comprising the step of receiving configuration information related to a codebook for the aforementioned subset of antenna ports. [Claim 9] The method according to claim 1, further comprising the step of receiving configuration information or control information related to a rate matching pattern corresponding to the antenna port subset. [Claim 10] A terminal (user equipment: UE) in a wireless communication system, Transceiver; and, A processor connected to the aforementioned transceiver; The aforementioned processor, Receive configuration information for a CSI (channel state information) report that includes at least one sub-configuration. Check the information related to the antenna port subset associated with at least one of the aforementioned sub-settings. Based on the measurement results of at least one CSI-RS related to the CSI report, a CSI is generated for the at least one sub-setting. It is configured to transmit a CSI report, including the aforementioned CSI, to a base station. The aforementioned CSI includes PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The aforementioned antenna port index is determined by mapping the antenna ports to a continuous range of values ​​starting from the index's starting value, in ascending order of index within the overall set. [Claim 11] A communication device, At least one processor; and, The system comprises at least one computer memory connected to the at least one processor, which stores instruction words that instruct operations when executed by the at least one processor; The aforementioned operation is, A step to receive configuration information for a CSI (channel state information) report that includes at least one sub-configuration; A step of verifying information related to an antenna port subset associated with at least one of the aforementioned sub-settings; A step of generating a CSI for at least one sub-setting based on measurement results based on at least one CSI-RS related to the CSI report; and, The step of transmitting a CSI report including the CSI to a base station; The aforementioned CSI includes PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The antenna port index is determined by mapping the antenna ports to a continuous set of values, starting from the index's starting value, in ascending order of index within the overall set, in a communication device. [Claim 12] A non-transitory, computer-readable storage medium that stores at least one instruction, The processor includes at least one executable instruction word, The at least one command word, the device Receive configuration information for a CSI (channel state information) report that includes at least one sub-configuration; Check the information related to the antenna port subset associated with at least one of the aforementioned sub-settings; Based on the measurement results from at least one CSI-RS related to the CSI report, a CSI is generated for the at least one sub-setting; Instruct the base station to transmit the CSI report, including the aforementioned CSI; The aforementioned CSI includes PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The antenna port index is determined by mapping the antenna ports in ascending order of index within the overall set to a continuous range of values ​​starting from the index's starting value, and is stored in a computer-readable medium.

Claims

1. A method, The step of receiving configuration information for a CSI (channel state information) report, which includes at least one sub-configuration, via a user equipment (UE); The terminal performs the step of checking information related to an antenna port subset associated with at least one sub-setting; The terminal generates a CSI for at least one sub-setting based on measurement results from at least one CSI-RS related to the CSI report; and, The terminal transmits a CSI report, including the CSI, to a base station; The aforementioned CSI includes a PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The antenna port index is determined by mapping the antenna ports to a continuous set of values, starting from the index's starting value, in ascending order of index within the overall set.

2. The method according to claim 1, wherein the antenna port subset is indicated using a bitmap.

3. The method according to claim 2, wherein each bit included in the bitmap corresponds to at least one antenna port or at least one CDM (code domain multiplicing) group.

4. The method according to claim 1, wherein the PMI is determined based on a codebook corresponding to the antenna port subset.

5. The method according to claim 1, wherein the PMI is determined based on the port layout with modified N1 and N2, obtained by alternating the values ​​of N1 and N2 of the port layout of the antenna port subset.

6. The method according to claim 1, wherein the antenna port subset includes on antenna ports excluding off antenna ports.

7. The method according to claim 6, wherein the off-state antenna ports are determined on a CDM (code domain multiplicing) group basis.

8. The method according to claim 1, further comprising the step of receiving configuration information related to a codebook for the antenna port subset.

9. The method according to claim 1, further comprising the step of receiving configuration information or control information related to a rate matching pattern corresponding to the antenna port subset.

10. A terminal (user equipment: UE), Transceiver; and, A processor connected to the aforementioned transceiver; The aforementioned processor, Receive configuration information for a CSI (channel state information) report that includes at least one sub-configuration. Check the information related to the antenna port subset associated with at least one of the aforementioned sub-settings. Based on the measurement results from at least one CSI-RS related to the CSI report, a CSI for at least one sub-setting is generated. It is configured to transmit a CSI report, including the aforementioned CSI, to a base station. The aforementioned CSI includes a PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The antenna port index is determined by mapping the antenna ports to a continuous set of values, starting from the index's starting value, in ascending order of index within the overall set.

11. A communication device, At least one processor; and, The system comprises at least one computer memory connected to the at least one processor, which stores instruction words that instruct operations when executed by the at least one processor; The aforementioned operation is, A step of receiving configuration information for a CSI (channel state information) report that includes at least one sub-configuration; A step of verifying information related to an antenna port subset associated with at least one of the aforementioned sub-settings; A step of generating a CSI for at least one sub-setting based on measurement results based on at least one CSI-RS related to the CSI report; and, The step of transmitting a CSI report including the CSI to a base station; The aforementioned CSI includes a PMI (precoding matrix indicator), The PMI is determined based on the antenna port index mapped to the antenna port included in the antenna port subset. The antenna port index is determined by mapping the antenna ports to a continuous set of values, starting from the index's starting value, in ascending order of index within the overall set, in a communication device.

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