Method and apparatus for transmitting and receiving downlink channel state information in wireless mobile communication system

Abstract

The present embodiments provide a method by which a terminal transmits downlink channel state information (CSI), the method comprising the steps of: receiving subband full duplex (SBFD) configuration information including configuration information for a plurality of downlink subbands which are non-contiguous in a frequency domain and configuration information for SBFD symbols; receiving wideband CSI reporting configuration information; and transmitting wideband channel state information on the basis of the wideband CSI reporting configuration information, wherein the wideband channel state information in the SBFD symbol is divided into subband integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

Description

Method and device for transmitting and receiving downlink channel status information in a wireless mobile communication system

[0001] The present embodiments propose a method and apparatus for transmitting and receiving downlink channel state information in a wireless mobile communication system in a next-generation wireless access network (in this disclosure, “5G,” “NR [New Radio],” “5G-Advanced,” “6G,” or a subsequent 3GPP wireless access network).

[0002] TDD (Time Division Duplex) is a duplexing method widely used in commercial New Radio (NR) and 5G mobile communication systems. In TDD, time-slot radio resources are divided into downlink and uplink slots. Typically, downlink slots are distributed at a higher rate than uplink slots, depending on the distribution ratio of uplink to downlink traffic.

[0003] However, these limitations on uplink slots negatively impact coverage and latency. Full-duplex communication has recently attracted attention as a technology to address these issues.

[0004] In such a full-duplex communication environment, especially when full-duplex communication is configured in units of symbols or slots based on subbands, a specific design is required for the operation of measuring and reporting channel state information.

[0005] Embodiments of the present disclosure can provide a method and device for transmitting and receiving downlink channel state information in a wireless mobile communication system.

[0006] In one aspect, the present embodiments provide a method for a terminal to transmit downlink channel state information (CSI), the method comprising: receiving subband full duplex (SBFD) configuration information including configuration information for a plurality of non-consecutive downlink subbands in a frequency domain and configuration information for a subband-based full duplex (SBFD) symbol; receiving wideband CSI reporting configuration information; and transmitting wideband channel state information based on the wideband CSI reporting configuration information, wherein the wideband channel state information in the SBFD symbol is divided into subband-integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

[0007] In another aspect, the present embodiments provide a method for a base station to receive downlink channel state information (CSI), the method comprising: transmitting subband full duplex (SBFD) configuration information including configuration information for a plurality of non-consecutive downlink subbands in a frequency domain and configuration information for a subband-based full duplex (SBFD) symbol; transmitting wideband CSI reporting configuration information; and receiving wideband channel state information based on the wideband CSI reporting configuration information, wherein the wideband channel state information in the SBFD symbol is divided into subband-integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

[0008] In another aspect, the present embodiments provide a terminal for transmitting downlink channel state information (CSI), comprising a transmitter, a receiver, and a control unit for controlling operations of the transmitter and the receiver, wherein the control unit receives subband full duplex (SBFD) configuration information including configuration information for a plurality of non-contiguous downlink subbands in a frequency domain and configuration information for a subband-based full duplex (SBFD) symbol, receives wideband CSI reporting configuration information, and transmits wideband channel state information based on the wideband CSI reporting configuration information, wherein the wideband channel state information in the SBFD symbol is divided into subband-integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

[0009] In another aspect, the present embodiments provide a base station that receives downlink channel state information (CSI), including a transmitter, a receiver, and a control unit that controls operations of the transmitter and the receiver, wherein the control unit transmits subband full duplex (SBFD) configuration information including configuration information for a plurality of non-contiguous downlink subbands in a frequency domain and configuration information for a subband-based full duplex (SBFD) symbol, transmits wideband CSI reporting configuration information, and receives wideband channel state information based on the wideband CSI reporting configuration information, wherein the wideband channel state information in the SBFD symbol is divided into subband-integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

[0010] According to the present embodiments, a method and device for transmitting and receiving downlink channel state information in an environment where full-duplex communication is applied can be provided.

[0011] FIG. 1 is a schematic diagram illustrating the structure of an NR wireless communication system to which the present embodiment can be applied.

[0012] FIG. 2 is a drawing for explaining a frame structure in an NR system to which the present embodiment can be applied.

[0013] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0014] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0015] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0016] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0017] Figure 7 is a drawing for explaining CORESET.

[0018] FIG. 8 is a diagram illustrating a procedure for a terminal to transmit downlink channel state information according to one embodiment.

[0019] FIG. 9 is a diagram illustrating a procedure for a base station to receive downlink channel state information according to one embodiment.

[0020] FIG. 10 and FIG. 11 are diagrams for explaining that an uplink subband is set in an arbitrary downlink slot according to one embodiment.

[0021] Fig. 12 is a drawing showing the configuration of a terminal according to another embodiment.

[0022] Fig. 13 is a drawing showing the configuration of a base station according to another embodiment.

[0023] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. When adding reference numerals to components in each drawing, identical components may have the same numerals as much as possible even if they are shown in different drawings. In addition, when describing the present embodiments, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the technical idea of ​​the present invention, the detailed description may be omitted. When "includes," "has," "consists of," etc. are used in this specification, other parts may be added unless "only" is used. When a component is expressed in the singular, it may include a case in which the plural is included unless specifically stated otherwise.

[0024] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of the present disclosure. These terms are only intended to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by the terms.

[0025] In a description of the positional relationship of components, when it is described that two or more components are "connected," "combined," or "connected," it should be understood that the two or more components may be directly "connected," "combined," or "connected," but that the two or more components may also be further "interposed" with another component to be "connected," "combined," or "connected." Here, the other component may be included in one or more of the two or more components that are "connected," "combined," or "connected" to each other.

[0026] In the description of the temporal flow relationship related to components, operation methods, or manufacturing methods, for example, when the temporal or flow relationship is described as “after”, “following”, “next to”, “before”, etc., it may also include cases where it is not continuous, unless “immediately” or “directly” is used.

[0027] Meanwhile, when numerical values ​​or corresponding information (e.g., levels, etc.) for components are mentioned, even without separate explicit description, the numerical values ​​or corresponding information may be interpreted as including an error range that may occur due to various factors (e.g., process factors, internal or external impact, noise, etc.).

[0028] The wireless communication system in this specification refers to a system for providing various communication services such as voice, data packets, etc. using wireless resources, and may include a terminal, a base station, or a core network.

[0029] The embodiments disclosed below can be applied to wireless communication systems using various wireless access technologies. For example, the embodiments can be applied to various wireless access technologies such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), or NOMA (non-orthogonal multiple access). In addition, the wireless access technology may not only refer to a specific access technology, but also to each generation of communication technologies established by various communication agreement organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTSterrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink. Thus, the present embodiments can be applied to currently disclosed or commercialized wireless access technologies, as well as wireless access technologies currently under development or to be developed in the future.

[0030] Meanwhile, the term "terminal" in this specification is a comprehensive concept that refers to a device that includes a wireless communication module that performs communication with a base station in a wireless communication system, and should be interpreted as a concept that includes not only UE (User Equipment) in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), but also MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), and wireless device in GSM. In addition, the terminal may be a user portable device such as a smartphone depending on the usage type, and in a V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, etc. In addition, in the case of a Machine Type Communication system, it may mean an MTC terminal, M2M terminal, URLLC terminal, etc. that is equipped with a communication module to perform machine type communication.

[0031] The base station or cell in this specification refers to an end that communicates with a terminal in terms of a network, and includes various coverage areas such as Node-B, eNB (evolved Node-B), gNB (gNode-B), LPN (Low Power Node), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Point (e.g., Transmission Point, Reception Point, Transmission / Reception Point), Relay Node, Mega Cell, Macro Cell, Micro Cell, Pico Cell, Femto Cell, RRH (Remote Radio Head), RU (Radio Unit), and Small Cell. In addition, a cell may mean including a BWP (Bandwidth Part) in the frequency domain. For example, a serving cell may mean an Activation BWP of a terminal.

[0032] Since the various cells listed above have a base station that controls one or more cells, the base station can be interpreted in two meanings. 1) It can be a device itself that provides a mega cell, macro cell, micro cell, pico cell, femto cell, or small cell in relation to a wireless area, or 2) it can indicate the wireless area itself. In 1), all devices that provide a given wireless area are controlled by the same entity or that interact to cooperatively configure the wireless area are all indicated as a base station. Depending on how the wireless area is configured, a point, a transceiver point, a transmission point, a reception point, etc. can be an embodiment of a base station. In 2), the wireless area itself that receives or transmits a signal from the perspective of a user terminal or a neighboring base station can also be indicated as a base station.

[0033] In this specification, a cell may mean a component carrier having coverage of a signal transmitted from a transmission / reception point or a transmission / reception point itself.

[0034] Uplink (UL, or uplink) refers to a method of transmitting and receiving data from a terminal to a base station, and downlink (DL, or downlink) refers to a method of transmitting and receiving data from a base station to a terminal. Downlink may refer to communication or a communication path from multiple transmission / reception points to a terminal, and uplink may refer to communication or a communication path from a terminal to multiple transmission / reception points. In this case, in the downlink, the transmitter may be part of the multiple transmission / reception points, and the receiver may be part of the terminal. In addition, in the uplink, the transmitter may be part of the terminal, and the receiver may be part of the multiple transmission / reception points.

[0035] Uplink and downlink transmit and receive control information through control channels such as PDCCH (Physical Downlink Control CHannel) and PUCCH (Physical Uplink Control CHannel), and transmit and receive data by configuring data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel). Hereinafter, the situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH is also expressed in the form of 'transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH'.

[0036] For clarity of explanation, the technical idea of ​​this invention is described below mainly with reference to the 3GPP LTE / LTE-A / NR (New RAT) communication system, but the technical features of this invention are not limited to the communication system.

[0037] After researching 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of the next-generation wireless access technology of the ITU-R. Specifically, 3GPP develops LTE-A pro, which enhances LTE-Advanced technology to meet the requirements of the ITU-R, and NR, a new communication technology separate from 4G communication technology. Both LTE-A pro and NR refer to 5G communication technology, and in the following, 5G communication technology will be explained with NR as the focus, unless a specific communication technology is specifically mentioned.

[0038] The operating scenario in NR defines various operation scenarios by adding considerations for satellites, automobiles, and new verticals to the existing 4G LTE scenario, and in terms of service, it supports the eMBB (Enhanced Mobile Broadband) scenario, the mMTC (Massive Machine Communication) scenario that has high terminal density but is deployed over a wide area and requires low data rate and asynchronous access, and the URLLC (Ultra Reliability and Low Latency) scenario that requires high responsiveness and reliability and can support high-speed mobility.

[0039] To meet these scenarios, NR introduces a wireless communication system that incorporates new waveform and frame structure technologies, low latency technologies, support for ultra-high frequency bands (mmWave), and forward compatibility technologies. In particular, NR systems offer various technological changes in terms of flexibility to ensure forward compatibility. The key technical features of NR are described below with reference to the drawings.

[0040]

[0041] <NR 시스템 일반>

[0042] Figure 1 is a schematic diagram illustrating the structure of an NR system to which the present embodiment can be applied.

[0043] Referring to Fig. 1, the NR system is divided into 5GC (5G Core Network) and NR-RAN parts, and the NG-RAN is composed of gNBs and ng-eNBs that provide user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocol termination for UE (User Equipment). gNBs or gNBs and ng-eNBs are interconnected via the Xn interface. gNBs and ng-eNBs are each connected to the 5GC via the NG interface. The 5GC can be configured to include an AMF (Access and Mobility Management Function) that is responsible for the control plane such as terminal access and mobility control functions, and an UPF (User Plane Function) that is responsible for the control function for user data. NR includes support for both frequency bands below 6 GHz (FR1, Frequency Range 1) and frequency bands above 6 GHz (FR2, Frequency Range 2).

[0044] gNB refers to a base station that provides NR user plane and control plane protocol termination to terminals, and ng-eNB refers to a base station that provides E-UTRA user plane and control plane protocol termination to terminals. The base station described in this specification should be understood to encompass both gNB and ng-eNB, and may also be used to refer to gNB or ng-eNB separately as needed.

[0045] <NR 웨이브 폼, 뉴머롤러지 및 프레임 구조>

[0046] NR uses the CP-OFDM waveform with a cyclic prefix for downlink transmission, and CP-OFDM or DFT-s-OFDM for uplink transmission. OFDM technology is easily combined with MIMO (Multiple Input Multiple Output) and offers the advantages of high spectral efficiency and low-complexity receivers.

[0047] Meanwhile, in NR, the requirements for data rates, latency, and coverage differ across the three scenarios mentioned above. Therefore, it is necessary to efficiently satisfy these requirements across the frequency bands that comprise any NR system. To this end, technologies have been proposed to efficiently multiplex radio resources based on multiple different numerologies.

[0048] Specifically, the NR transmission numerator is determined based on the sub-carrier spacing and the cyclic prefix (CP), and is changed exponentially with the μ value being an exponent value of 2 based on 15 kHz, as shown in Table 1 below.

[0049] μ서브캐리어 간격Cyclic prefixSupported for dataSupported for synch015NormalYesYes130NormalYesYes260Normal, ExtendedYesNo3120NormalYesYes4240NormalNoYes

[0050] As shown in Table 1 above, the numerology of NR can be divided into five types according to the subcarrier spacing. This is different from the fixed subcarrier spacing of LTE, one of the 4G communication technologies, at 15 kHz. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, and 120 kHz, and the subcarrier spacing used for synchronization signal transmission is 15, 30, 12, and 240 kHz. In addition, the extended CP is applied only to the 60 kHz subcarrier spacing. Meanwhile, the frame structure in NR is defined as a 10 ms frame consisting of 10 subframes with the same length of 1 ms. One frame can be divided into half frames of 5 ms, and each half frame contains 5 subframes. In the case of a 15 kHz subcarrier spacing, one subframe consists of one slot, and each slot consists of 14 OFDM symbols. FIG. 2 is a diagram for explaining the frame structure in an NR system to which the present embodiment can be applied. Referring to FIG. 2, a slot is fixedly composed of 14 OFDM symbols in the case of a normal CP, but the length of the slot in the time domain may vary depending on the subcarrier spacing. For example, in the case of a numerology with a 15 kHz subcarrier spacing, a slot is composed of 1 ms, which is the same length as a subframe. In contrast, in the case of a numerology with a 30 kHz subcarrier spacing, a slot is composed of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, a subframe and a frame are defined with a fixed time length, and a slot is defined by the number of symbols, so the time length may vary depending on the subcarrier spacing.

[0051] Meanwhile, NR defines slots as the basic scheduling unit and also introduces mini-slots (or sub-slots, or non-slot-based scheduling) to reduce transmission delay in the wireless section. Using wider subcarrier spacing reduces transmission delay in the wireless section by shortening the length of each slot inversely. Mini-slots (or sub-slots) are designed to efficiently support URLLC scenarios and allow scheduling in units of 2, 4, or 7 symbols.

[0052] Furthermore, unlike LTE, NR defines uplink and downlink resource allocation at the symbol level within a single slot. To reduce HARQ delay, a slot structure was defined that allows HARQ ACK / NACKs to be transmitted directly within the transmission slot. This slot structure is referred to as a self-contained structure and will be described in detail.

[0053] NR is designed to support a total of 256 slot formats, of which 62 are used in 3GPP Rel-15. It also supports a common frame structure that configures FDD or TDD frames through various combinations of slots. For example, it supports a slot structure in which all symbols in a slot are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which downlink and uplink symbols are combined. NR also supports data transmission being distributed and scheduled across one or more slots. Therefore, a base station can use a slot format indicator (SFI) to inform a UE whether a slot is a downlink slot, an uplink slot, or a flexible slot. The base station can indicate the slot format by indicating an index of a table configured through UE-specific RRC signaling using the SFI, and can also indicate it dynamically through DCI (Downlink Control Information) or statically or semi-statically through RRC.

[0054] <NR 물리 자원 >

[0055] In relation to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, and bandwidth parts are considered.

[0056] Antenna ports are defined such that the channel through which a symbol on an antenna port is carried can be inferred from the channel through which another symbol on the same antenna port is carried. Two antenna ports are said to be quasi co-located (or quasi co-located) if the large-scale properties of the channel through which a symbol on one antenna port is carried can be inferred from the channel through which a symbol on the other antenna port is carried. Here, the large-scale properties include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0057] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0058] Referring to Figure 3, a resource grid may exist for each numeral, as NR supports multiple numerals on the same carrier. Furthermore, resource grids may exist based on antenna ports, subcarrier spacing, and transmission direction.

[0059] A resource block (RB) consists of 12 subcarriers and is defined solely in the frequency domain. Furthermore, a resource element (RE) consists of one OFDM symbol and one subcarrier. Therefore, as shown in Figure 3, the size of a single RB can vary depending on the subcarrier spacing. NR also defines "Point A," which serves as a common reference point for the RB grid, as well as common RBs and virtual RBs.

[0060] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0061] Unlike LTE, where the carrier bandwidth is fixed at 20 MHz, NR sets the maximum carrier bandwidth from 50 MHz to 400 MHz for each subcarrier interval. Therefore, it is not assumed that all terminals will use the entire carrier bandwidth. Accordingly, NR allows terminals to designate bandwidth parts (BWPs) within the carrier bandwidth, as illustrated in Figure 4. Furthermore, bandwidth parts are associated with a single numerology, consist of a subset of consecutive common resource blocks, and can be dynamically activated over time. Each terminal is configured with up to four bandwidth parts for both the uplink and downlink, and data is transmitted and received using the bandwidth parts activated at a given time.

[0062] In the case of a paired spectrum, the uplink and downlink bandwidth parts are set independently, and in the case of an unpaired spectrum, the downlink and uplink bandwidth parts are set in pairs so that they can share a center frequency to prevent unnecessary frequency re-tuning between downlink and uplink operations.

[0063] <NR 초기 접속>

[0064] In NR, a terminal performs cell search and random access procedures to connect to a base station and perform communication.

[0065] Cell search is a procedure in which a terminal synchronizes to the cell of a corresponding base station, obtains a physical layer cell ID, and obtains system information using the synchronization signal block (SSB) transmitted by the base station.

[0066] FIG. 5 is a diagram illustrating an example of a synchronization signal block in a wireless access technology to which the present embodiment can be applied.

[0067] Referring to FIG. 5, SSB is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), each occupying 1 symbol and 127 subcarriers, and a PBCH spanning 3 OFDM symbols and 240 subcarriers.

[0068] The terminal receives SSB by monitoring SSB in the time and frequency domain.

[0069] SSB can be transmitted up to 64 times in 5ms. Multiple SSBs are transmitted in different transmission beams within 5ms, and the terminal performs detection assuming that SSBs are transmitted every 20ms based on a specific beam used for transmission. The number of beams that can be used for SSB transmission within 5ms can increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted below 3GHz, up to 8 in the frequency band between 3GHz and 6GHz, and up to 64 different beams can be used for SSB transmission in the frequency band above 6GHz.

[0070] SSB contains two symbols in one slot, and the starting symbol and number of repetitions within the slot are determined as follows depending on the subcarrier spacing.

[0071] Meanwhile, unlike SS in conventional LTE, SSB is not transmitted at the center frequency of the carrier bandwidth. This means that SSB can be transmitted even in locations other than the center of the system bandwidth, and when supporting wideband operation, multiple SSBs can be transmitted in the frequency domain. Accordingly, the terminal monitors SSB using the synchronization raster, which is a candidate frequency location for monitoring SSB. The carrier raster, which is the center frequency location information of the channel for initial access, and the synchronization raster are newly defined in NR. The synchronization raster has a wider frequency interval than the carrier raster, which can support the terminal's fast SSB search.

[0072] A UE can obtain the MIB through the PBCH of the SSB. The MIB (Master Information Block) includes the minimum information required for the UE to receive the remaining system information (RMSI, Remaining Minimum System Information) broadcast by the network. In addition, the PBCH may include information on the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (e.g., SIB1 numerology information, information related to SIB1 CORESET, search space information, PDCCH-related parameter information, etc.), offset information between the common resource block and the SSB (the absolute position of the SSB within the carrier is transmitted through SIB1), etc. Here, the SIB1 numerology information is also applied equally to some messages used in the random access procedure for the UE to access the base station after completing the cell search procedure. For example, the numerology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.

[0073] The aforementioned RMSI may refer to SIB1 (System Information Block 1), and SIB1 is broadcast periodically (e.g., every 160 ms) in the cell. SIB1 contains information necessary for the UE to perform the initial random access procedure and is periodically transmitted via PDSCH. In order for the UE to receive SIB1, it must receive numerology information used for SIB1 transmission and CORESET (Control Resource Set) information used for SIB1 scheduling via PBCH. The UE checks scheduling information for SIB1 using SI-RNTI in CORESET and acquires SIB1 on PDSCH according to the scheduling information. The remaining SIBs, excluding SIB1, may be transmitted periodically or upon request of the UE.

[0074] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0075] Referring to FIG. 6, once cell search is complete, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted via the PRACH. Specifically, the random access preamble is transmitted to the base station via the PRACH, which consists of consecutive radio resources in a specific slot that is periodically repeated. Generally, when a terminal initially accesses a cell, a contention-based random access procedure is performed, and when performing random access for beam failure recovery (BFR), a non-contention-based random access procedure is performed.

[0076] The UE receives a random access response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), an UL Grant (uplink radio resource), a temporary C-RNTI (Temporary Cell - Radio Network Temporary Identifier), and a TAC (Time Alignment Command). Since one random access response may include random access response information for one or more UEs, the random access preamble identifier may be included to indicate which UE the included UL Grant, temporary C-RNTI, and TAC are valid for. The random access preamble identifier may be an identifier for the random access preamble received by the base station. The TAC may be included as information for the UE to adjust uplink synchronization. The random access response may be indicated by a random access identifier on the PDCCH, i.e., an RA-RNTI (Random Access - Radio Network Temporary Identifier).

[0077] Upon receiving a valid random access response, the terminal processes the information contained in the random access response and performs scheduled transmission to the base station. For example, the terminal applies TAC and stores a temporary C-RNTI. Furthermore, using the UL Grant, the terminal transmits data stored in its buffer or newly generated data to the base station. In this case, information that identifies the terminal must be included.

[0078] Finally, the terminal receives a downlink message for contention resolution.

[0079] <NR CORESET>

[0080] The downlink control channel in NR is transmitted in a CORESET (Control Resource Set) with a length of 1 to 3 symbols, and transmits uplink / downlink scheduling information, SFI (Slot format Index), and TPC (Transmit Power Control) information.

[0081] To ensure system flexibility, NR introduced the CORESET concept. CORESET (Control Resource Set) refers to time-frequency resources for downlink control signals. A terminal can decode control channel candidates using one or more search spaces within the CORESET time-frequency resources. A QCL (Quasi CoLocation) assumption is established for each CORESET, which is used to inform the characteristics of analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay assumed by the conventional QCL.

[0082] Figure 7 is a drawing for explaining CORESET.

[0083] Referring to Figure 7, a CORESET can exist in various forms within the carrier bandwidth within a single slot, and in the time domain, a CORESET can consist of up to three OFDM symbols. In addition, a CORESET is defined as a multiple of six resource blocks up to the carrier bandwidth in the frequency domain.

[0084] The first CORESET is indicated via the MIB as part of the initial bandwidth part configuration, allowing the terminal to receive additional configuration and system information from the network. After establishing a connection with the base station, the terminal can receive and configure one or more CORESET information via RRC signaling.

[0085] Wider bandwidth operations

[0086] Existing LTE systems supported scalable bandwidth operation for any LTE Component Carrier (CC). That is, depending on the deployment scenario, any LTE operator could configure a single LTE CC with a bandwidth ranging from a minimum of 1.4 MHz to a maximum of 20 MHz, and a normal LTE terminal supported transmission and reception capabilities of 20 MHz bandwidth for a single LTE CC.

[0087] However, in the case of NR, the design is made to support NR terminals with different transmission and reception bandwidth capabilities through a single wideband NR CC, and accordingly, it is required to configure one or more bandwidth parts (BWP, bandwidth part(s)) consisting of segmented bandwidths for any NR CC, and to support flexible wider bandwidth operation through different bandwidth part configurations and activations for each terminal.

[0088] Specifically, in NR, one or more bandwidth parts can be configured through one serving cell configured from the terminal's perspective, and the terminal is defined to activate one downlink bandwidth part (DL bandwidth part) and one uplink bandwidth part (UL bandwidth part) in the serving cell to use them for uplink / downlink data transmission and reception. In addition, when multiple serving cells are configured in the terminal, that is, for the terminal to which CA is applied, it is defined to activate one downlink bandwidth part and / or uplink bandwidth part for each serving cell to use the radio resources of the serving cell to use them for uplink / downlink data transmission and reception.

[0089] Specifically, an initial bandwidth part for an initial access procedure of a terminal in an arbitrary serving cell is defined, one or more UE-specific bandwidth part(s) are configured for each terminal through dedicated RRC signaling, and a default bandwidth part for a fallback operation can also be defined for each terminal.

[0090] However, it can be defined that multiple downlink and / or uplink bandwidth parts can be activated and used simultaneously depending on the capability and bandwidth part(s) configuration of the terminal in any serving cell, but in NR rel-15, it is defined that only one downlink bandwidth part (DL bandwidth part) and one uplink bandwidth part (UL bandwidth part) can be activated and used in any terminal at any time.

[0091] In this specification, the terms frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals or various messages related to NR (New Radio) may be interpreted in the past or present meaning or in various meanings used in the future.

[0092] In this disclosure, CSI report configuration information may be referred to as a CSI-reportconfig message. Furthermore, CSI resource configuration information may be referred to as CSI-resourceconfig information. However, this is merely an example, and other terms may also be used, and the present disclosure is not limited to any specific term.

[0093]

[0094] Below, a method for transmitting and receiving downlink channel state information in a wireless mobile communication system will be specifically described with reference to related drawings.

[0095] FIG. 8 is a diagram illustrating a procedure (800) in which a terminal transmits downlink channel state information according to one embodiment.

[0096] Referring to FIG. 8, the terminal can receive SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in the frequency domain and configuration information for a subband full duplex (SBFD) symbol (S810).

[0097] The terminal can operate in TDD (Time Division Duplex) mode. TDD is a method of using time-interval radio resources by dividing them into downlink slots and uplink slots. The terminal can receive TDD configuration information from the base station to determine the format of symbols within the slots. In this case, the TDD configuration information can include configuration information regarding the slot format and configuration information for determining the format of symbols within the slot, and this information can be received via upper layer signaling or physical layer (L1) signaling.

[0098] That is, downlink symbols, uplink symbols, and flexible symbols with an undetermined transmission direction can be set for a certain period of time through an RRC message for setting the corresponding UL-DL slot. In addition, the terminal can receive terminal-specific RRC signaling that reallocates flexible symbols among the symbols set through cell-specific RRC signaling to uplink symbols, downlink symbols, or flexible symbols for each terminal.

[0099] Alternatively, the UE may be instructed to specify a dynamic slot format via a UE-group common PDCCH. For example, the UE may be dynamically instructed to specify a slot format via DCI format 2_0.

[0100] Additionally, the TDD configuration information may include information on reference subcarrier spacing (reference SCS), pattern 1, and pattern 2 that may be applied to the serving cell. In this case, the TDD configuration information may provide only pattern 1, or pattern 1 and pattern 2. Additionally, the TDD configuration information may include slot configuration period information of each pattern. The terminal may set a slot format per slot for a first number of slots as indicated by pattern 1, and if pattern 2 is provided, may set a slot format per slot for a second number of slots as indicated by pattern 2.

[0101] A terminal can perform communications in full-duplex mode. Full-duplex communication is a technology that allows a base station to simultaneously perform downlink transmission and uplink reception on the same radio resources. The terminal can also perform downlink reception and uplink transmission simultaneously. If the base station supports full-duplex communication based on subband non-overlapping, certain frequency resources within the same symbol in a TDD carrier can be used for downlink transmission, while other frequency resources can be used for uplink reception. In other words, within a TDD carrier, some frequency resources in any downlink symbol can be configured to be utilized for uplink transmission by the terminal, or to be utilized as flexible symbols for downlink / uplink transitions.

[0102] To this end, the terminal may receive SBFD configuration information. That is, the terminal may receive information on the time domain and frequency domain for configuring a downlink subband in an uplink slot or for configuring an uplink subband in a downlink slot. According to an example, the SBFD configuration information may include configuration information for a plurality of non-consecutive downlink subbands and configuration information for at least one uplink subband. In addition, the SBFD configuration information may include configuration information for an SBFD symbol in which an uplink subband and a downlink subband are configured in the frequency domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0103] In this case, the SBFD symbol allocation information may be set to consecutive SBFD symbols within the cycle of a TDD pattern set to one or two. Each pattern setting information may include the cycle setting information of the corresponding pattern, offset information, and duration information. At this time, the duration information may be set to the number of consecutive SBFD symbols from the offset, or may be set to a combination of the number of consecutive SBFD slots and the number of consecutive SBFD symbols. Alternatively, according to an example, the offset may be set to an end point instead of a start point. That is, offset information corresponding to the end point and duration information from the end point may be set.

[0104] For example, the SBFD configuration information may include configuration information for at least two downlink subbands. For example, if an uplink subband is located in the center of the frequency band, two downlink subbands may be configured above and below the uplink subband. In this case, a guard band may be configured between the uplink subband and the downlink subband, and the guard band may be inferred from frequency resource information for the uplink subband and the downlink subband. In the following description, it is assumed that two non-consecutive downlink subbands, for example, a first downlink subband and a second downlink subband, are configured in an SBFD symbol. However, this is merely an example, and the technical idea of ​​the present disclosure may be substantially equally applied even when three or more downlink subbands are configured.

[0105] For example, SBFD configuration information can be received via cell-specific upper layer signaling. That is, the terminal can receive SBFD subband configuration information from the base station via cell-specific RRC signaling. The terminal can receive the TDD configuration information and SBFD subband configuration information to configure a format for each slot.

[0106] Referring again to FIG. 8, the terminal may receive wideband CSI reporting configuration information (S820) and transmit wideband channel state information based on the wideband CSI reporting configuration information (S830).

[0107] A terminal may be configured to report wideband channel state information based on a result of channel state information measurement performed by receiving a downlink reference signal, such as, for example, a CSI-RS or SSB, in an SBFD symbol. Here, the wideband channel state information may include wideband CQI and / or wideband PMI information. In addition, reporting of the wideband channel state information may mean measuring and reporting channel state information for all of a plurality of non-consecutive downlink subbands configured in the SBFD symbol, as described above.

[0108] The terminal may be configured to report subband-integrated wideband channel state information for two downlink subbands configured in an activated downlink bandwidth part (DL BWP). Alternatively, the terminal may be configured to report subband-specific wideband channel state information for each of the two downlink subbands to the base station. Alternatively, the terminal may be configured to report both the subband-integrated wideband channel state information and the subband-specific wideband channel state information to the base station.

[0109] To this end, the terminal can receive a reporting mode for wideband channel status information configured by the base station. For example, the terminal can be configured to a reporting mode for subband-integrated wideband channel status information. In this case, the terminal can calculate wideband CQI and / or PMI values ​​based on associated CSI reference signals (CSI-RS or SSB) transmitted on all frequency resources of two downlink subbands and report the subband-integrated wideband channel status information to the base station.

[0110] Alternatively, the terminal may be set to a reporting mode for wideband channel state information for each subband. In this case, the terminal may obtain first wideband channel state information based on a CSI reference signal (CSI-RS or SSB) received through a frequency resource of a first downlink subband, and second wideband channel state information based on a CSI reference signal received through a frequency resource of a second downlink subband. The terminal may report both the first wideband channel state information and the second wideband channel state information to the base station.

[0111] For example, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be determined through higher layer signaling received from the base station. That is, the terminal may be configured to either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information through higher layer signaling, such as a CSI-reportconfig message.

[0112] Alternatively, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be indicated through downlink control information or MAC CE signaling that triggers wideband CSI reporting received from the base station. That is, the terminal may be indicated through downlink control information or MAC CE signaling for either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information.

[0113] Subband integrated wideband channel status information and subband-specific wideband channel status information can be multiplexed and transmitted in a single CSI report message.

[0114] For example, the first wideband channel state information based on the first downlink subband and the second wideband channel state information based on the second downlink subband may be multiplexed and reported to the base station via a single CSI reporting message. That is, in the case of periodic / semi-persistent reporting, the first wideband channel state information and the second wideband channel state information may be multiplexed for each CSI reporting period and transmitted to the base station via the PUCCH or PUSCH. Alternatively, the first wideband channel state information and the second wideband channel state information may be reported to the base station via separate CSI reporting messages.

[0115] In this case, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be set via RRC signaling in the case of periodic or semi-persistent CSI reporting. In addition, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting. In this case, the wideband channel state information for each subband can be transmitted together with ID information for each subband. Alternatively, the CSI reporting information can be configured to be multiplexed and transmitted in a predetermined order, for example, from the first wideband channel state information to the second wideband channel state information.

[0116] Alternatively, according to an example, the terminal may report wideband channel state information for a specific downlink subband among the first downlink subband and the second downlink subband to the base station. In this case, the terminal may receive configuration information, for example, DL subband ID information, for the downlink subband that is the target for wideband channel state information feedback through CSI-reportconfig. Alternatively, the terminal may be configured to report wideband channel state information for a downlink subband with better channel quality measured by the terminal among the first downlink subband and the second downlink subband. In this case, the corresponding CSI reporting information may include downlink subband ID information for identifying the downlink subband.

[0117] Alternatively, according to an example, the terminal may be configured to report both subband-integrated wideband channel state information and subband-specific wideband channel state information. In this case, the terminal may multiplex and report the subband-integrated wideband channel state information and the subband-specific wideband channel state information through a single CSI reporting message. In this case, the CSI reporting message may include identifier information for distinguishing the subband-integrated wideband channel state information and the subband-specific wideband channel state information. Alternatively, the CSI reporting message may be configured to be multiplexed in a predetermined order, for example, subband-integrated wideband channel state information -> first wideband channel state information -> second wideband channel state information. Alternatively, the terminal may be configured to alternately report the subband-integrated wideband channel state information and the first wideband channel state information and the second wideband channel state information in the case of periodic or semi-persistent CSI reporting.

[0118] Additionally, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be configured via RRC signaling in the case of periodic or semi-persistent CSI reporting. Furthermore, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting.

[0119] Additionally, when CSI reporting configuration information, such as CSI-reportconfig for wideband channel state information reporting in SBFD symbols for a terminal, is set to aperiodic reporting, the terminal may be instructed with configuration information for the aforementioned reporting modes via downlink control information that triggers the aperiodic CSI reporting. In particular, identifier information of a downlink subband for wideband channel state information reporting for a specific downlink subband may also be instructed to the terminal via the downlink control information.

[0120] Accordingly, a method and device for transmitting and receiving downlink channel state information in an environment where full-duplex communication is applied can be provided.

[0121] FIG. 9 is a diagram illustrating a procedure (900) for a base station to receive downlink channel state information (CSI) according to one embodiment. The description given above in FIG. 8 may be omitted to avoid redundant description. In this case, the omitted content may be substantially equally applied to the base station, as long as it does not conflict with the technical spirit of the invention.

[0122] Referring to FIG. 9, the base station can transmit SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in the frequency domain and configuration information for a subband full duplex (SBFD) symbol (S910).

[0123] A base station can communicate with a terminal in full-duplex mode. Full-duplex communication is a technology that allows the base station to simultaneously perform downlink transmission and uplink reception on the same radio resources. The terminal can also perform downlink reception and uplink transmission simultaneously. If the base station supports full-duplex communication based on subband non-overlapping, certain frequency resources within the same symbol in a TDD carrier can be used for downlink transmission, while other frequency resources can be used for uplink reception. In other words, within a TDD carrier, some frequency resources in any downlink symbol can be configured to be utilized for uplink transmission by the terminal, or to be utilized as flexible symbols for downlink / uplink transitions.

[0124] To this end, the base station may transmit SBFD configuration information to the terminal. That is, the base station may transmit information on the time domain and frequency domain for configuring a downlink subband in an uplink slot or for configuring an uplink subband in a downlink slot. According to an example, the SBFD configuration information may include configuration information on a plurality of non-consecutive downlink subbands and configuration information on at least one uplink subband. In addition, the SBFD configuration information may include configuration information on an SBFD symbol in which an uplink subband and a downlink subband are configured in the frequency domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0125] In this case, the SBFD symbol allocation information may be set to consecutive SBFD symbols within the cycle of a TDD pattern set to one or two. Each pattern setting information may include the cycle setting information of the corresponding pattern, offset information, and duration information. At this time, the duration information may be set to the number of consecutive SBFD symbols from the offset, or may be set to a combination of the number of consecutive SBFD slots and the number of consecutive SBFD symbols. Alternatively, according to an example, the offset may be set to an end point instead of a start point. That is, offset information corresponding to the end point and duration information from the end point may be set.

[0126] For example, the SBFD configuration information may include configuration information for at least two downlink subbands. For example, if an uplink subband is located in the center of the frequency band, two downlink subbands may be configured above and below the uplink subband. In this case, a guard band may be configured between the uplink subband and the downlink subband, and the guard band may be inferred based on frequency resource information for the uplink subband and the downlink subband.

[0127] For example, SBFD configuration information can be transmitted via cell-specific upper layer signaling. That is, the base station can transmit SBFD subband configuration information to the terminal via cell-specific RRC signaling. The terminal can receive the TDD configuration information and SBFD subband configuration information and configure a format for each slot.

[0128] Referring again to FIG. 9, the base station can transmit wideband CSI reporting configuration information (S920) and, based on the wideband CSI reporting configuration information, receive wideband channel state information (S930).

[0129] The base station may be configured to report wideband channel state information to the terminal based on the results of channel state information measurement performed by receiving a downlink reference signal, such as, for example, CSI-RS or SSB, in an SBFD symbol.

[0130] The base station may configure the terminal to report subband-integrated wideband channel state information for two downlink subbands configured in an activated downlink bandwidth part (DL BWP). Alternatively, the base station may configure the terminal to report subband-specific wideband channel state information for each of the two downlink subbands to the base station. Alternatively, the base station may configure the terminal to report both the subband-integrated wideband channel state information and the subband-specific wideband channel state information to the base station.

[0131] To this end, the base station can transmit a reporting mode for the configured wideband channel state information to the terminal. For example, the base station can configure the terminal to a reporting mode for subband-integrated wideband channel state information. In this case, the terminal can calculate wideband CQI and / or PMI values ​​based on associated CSI reference signals (CSI-RS or SSB) transmitted on all frequency resources of two downlink subbands and report the subband-integrated wideband channel state information to the base station.

[0132] Alternatively, the base station may configure the terminal to report wideband channel state information for each subband. In this case, the terminal may obtain first wideband channel state information based on a CSI reference signal (CSI-RS or SSB) received through the frequency resource of the first downlink subband, and second wideband channel state information based on a CSI reference signal received through the frequency resource of the second downlink subband. The terminal may report both the first wideband channel state information and the second wideband channel state information to the base station.

[0133] For example, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be determined through higher layer signaling transmitted by the base station. That is, the terminal may be configured to either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information through higher layer signaling, such as a CSI-reportconfig message.

[0134] Alternatively, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be indicated through downlink control information or MAC CE signaling that triggers wideband CSI reporting transmitted by the base station. That is, the terminal may be indicated through downlink control information or MAC CE signaling for either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information.

[0135] Subband integrated wideband channel status information and subband-specific wideband channel status information can be multiplexed and transmitted in a single CSI report message.

[0136] For example, the first wideband channel state information based on the first downlink subband and the second wideband channel state information based on the second downlink subband may be multiplexed and received at the base station via a single CSI reporting message. That is, in the case of periodic / semi-persistent reporting, the first wideband channel state information and the second wideband channel state information may be multiplexed for each CSI reporting period and received at the base station via the PUCCH or the PUSCH. Alternatively, the first wideband channel state information and the second wideband channel state information may be received at the base station via separate CSI reporting messages.

[0137] In this case, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be set via RRC signaling in the case of periodic or semi-persistent CSI reporting. In addition, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting. In this case, the wideband channel state information for each subband can be transmitted together with ID information for each subband. Alternatively, the CSI reporting information can be configured to be multiplexed and transmitted in a predetermined order, for example, from the first wideband channel state information to the second wideband channel state information.

[0138] Alternatively, according to an example, the base station may receive wideband channel state information for a specific downlink subband among the first downlink subband and the second downlink subband from the terminal. In this case, the base station may transmit configuration information for the downlink subband that is the target for wideband channel state information feedback, for example, downlink subband ID information, to the terminal via CSI-reportconfig. Alternatively, the base station may configure the terminal to report wideband channel state information for a downlink subband with better channel quality measured by the terminal among the first downlink subband and the second downlink subband. In this case, the corresponding CSI reporting information may include downlink subband ID information for identifying the downlink subband.

[0139] Alternatively, according to an example, the base station may configure the terminal to report both subband-integrated wideband channel state information and subband-specific wideband channel state information. In this case, the terminal may multiplex and report the subband-integrated wideband channel state information and the subband-specific wideband channel state information through a single CSI reporting message. In this case, the CSI reporting message may include identifier information for distinguishing the subband-integrated wideband channel state information and the subband-specific wideband channel state information. Alternatively, the CSI reporting message may be configured to be multiplexed in a predetermined order, for example, subband-integrated wideband channel state information -> first wideband channel state information -> second wideband channel state information. Alternatively, the base station may configure the terminal to alternately report the subband-integrated wideband channel state information and the first wideband channel state information and the second wideband channel state information in the case of periodic or semi-persistent CSI reporting.

[0140] Additionally, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be configured via RRC signaling in the case of periodic or semi-persistent CSI reporting. Furthermore, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting.

[0141] Additionally, when CSI reporting configuration information, such as CSI-reportconfig for wideband channel state information reporting in SBFD symbols for terminals, is set to aperiodic reporting, the base station can indicate to the terminal the configuration information for the aforementioned reporting modes through downlink control information that triggers the aperiodic CSI reporting. In particular, identifier information of a downlink subband for wideband channel state information reporting for a specific downlink subband can also be indicated to the terminal through the downlink control information.

[0142] Accordingly, a method and device for transmitting and receiving downlink channel state information in an environment where full-duplex communication is applied can be provided.

[0143]

[0144] Hereinafter, with reference to the relevant drawings, each embodiment related to a method for transmitting and receiving downlink channel state information in a wireless mobile communication system will be described in detail.

[0145] The present disclosure proposes a method for measuring and reporting a downlink channel of a terminal in a wireless communication system. In particular, the present disclosure proposes a method for reporting a wideband Channel Quality Indicator (CQI) and / or a wideband Precoding Matrix Indicator (PMI) of a terminal in a mobile communication system supporting full-duplex communication.

[0146] TDD (Time Division Duplex) is a duplexing method widely used in commercial New Radio (NR) and 5G mobile communication systems. In TDD, time-slot radio resources are divided into downlink and uplink slots. Typically, downlink slots are distributed at a higher rate than uplink slots, depending on the distribution ratio of uplink to downlink traffic. However, this limitation on uplink slots negatively impacts coverage and latency. Full-duplex communication can be applied as a technology to address these issues.

[0147] Full-duplex communication is a technology that performs DL transmission and UL reception simultaneously on the same radio resources, specifically at the gNB, or base station. Simultaneous DL reception and UL transmission can also be performed at the terminal side. In other words, both the base station and the terminal can support full duplex. However, unlike the base station, which is structurally easy to cancel self-interference, the DL reception performance of the terminal is easily affected by self-interference of the UL transmission signal. Therefore, it is generally considered that the base station operates in full-duplex communication, and the terminal operates in half-duplex communication. Additionally, to reduce the influence of self-interference at the base station, a subband non-overlapping full-duplex (subband non-overlapping full-duplex, also referred to as SBFD or subband full-duplex in this disclosure) method can be primarily considered, in which DL transmission and UL reception are performed simultaneously, but the DL / UL are transmitted and received by distinguishing frequency resources rather than using the same resources.

[0148] That is, FIGS. 10 and 11 illustrate examples in which DL slots and UL slots are configured in a ratio of 4:1 in an arbitrary NR frequency band. However, some symbols of the last DL slot may be special slots including flexible symbols for DL / UL transition. In this way, when a TDD (Time Division Duplex) configuration is made, an uplink subband (UL subband) may be set to support UL transmission of a terminal in some (or all) of the DL slots. When a UL subband is set in an arbitrary DL slot, the UL subband may be set at the center of the frequency band, as shown in FIG. 10, or at the edge of the frequency band, as shown in FIG. 11. In this case, a guard band may be set between the UL subband and the downlink subband (DL subband) in the slot.

[0149] In addition, for frequency resources other than the UL subband and guard band, they can be utilized as DL subbands for DL ​​transmission and reception according to the existing slot / symbol configuration information. That is, as in FIG. 10, if the UL subband is configured around the center of the frequency band, two guard bands, one each above and below the UL subband, can be configured, and then similarly, two DL subbands, one each above and below the UL subband, can be configured. Alternatively, as in FIG. 11, if the UL subband is configured at the edge of the frequency band, one guard band and one DL subband can be configured following the UL subband.

[0150] The UL-DL slot configuration defined in NR is defined to be done on a cell-by-cell basis through cell-specific RRC signaling. That is, a pattern of DL symbols, UL symbols, and flexible symbols for a certain period is set through the RRC message 'tdd-UL-DL-ConfigurationCommon' for the corresponding UL-DL slot configuration. Additionally, through the UE-specific RRC signaling 'tdd-UL-DL-ConfigurationDedicated', only the flexible symbols set through the 'tdd-UL-DL-ConfigurationCommon' can be reallocated to UL symbols, DL symbols, or flexible symbols for each UE. Alternatively, a method for indicating a dynamic slot format through a UE-group common PDCCH is also defined. For this purpose, NR also supports a dynamic slot format indication method through DCI format 2_0.

[0151] According to the slot configuration method described above, any one symbol can be set or indicated as one of DL, UL, or Flexible. Fig. 10 is an example in which an arbitrary slot format is set to DDDSU through the existing slot configuration. D refers to a downlink slot, meaning that all OFDM symbols constituting the slot are set to DL. U refers to an uplink slot, meaning that all OFDM symbols constituting the slot are set to UL. S refers to a special slot, meaning a slot that includes a flexible symbol for DL / UL transition. Typically, in the case of a normal CP, the special slot can be configured with 12 DL symbols and 2 flexible symbols out of a total of 14 symbols. Alternatively, it can be configured with 10 DL symbols, 2 flexible symbols, and 2 UL symbols. That is, within any one TDD carrier, one symbol is configured or indicated as only one of DL, UL, or flexible.

[0152] However, as shown in FIGS. 10 and 11, if a UL subband is configured in any DL slot, DL transmission or UL transmission can occur simultaneously for each frequency resource in the symbol. In this way, a DL slot or symbol including a UL subband or a UL slot or symbol including a DL subband is referred to as an SBFD (subband full duplex) slot or SBFD symbol in the present disclosure.

[0153] In addition, in the present disclosure, a slot composed only of the SBFD symbols is referred to as an SBFD slot, and a slot composed only of symbols according to existing symbol settings (i.e., a slot composed only of symbols that do not include a UL subband, a DL subband, and a guardband) is referred to as a non-SBFD slot. Alternatively, a slot including at least one SBFD symbol may be referred to as an SBFD slot.

[0154]

[0155] Hereinafter, as described above, when any cell / network / base station supports SBFD operation, i.e., a method for reporting wideband CQI / PMI feedback information from an arbitrary terminal to a base station is proposed. In particular, as shown in FIG. 10, for any terminal configured with two or more DL subbands in an SBFD symbol, an operation for reporting wideband CQI and / or wideband PMI for each DL subband to the base station is proposed.

[0156] When a terminal is configured to report wideband CQI and / or wideband PMI feedback information based on a channel state information measurement result performed by receiving a downlink reference signal (e.g., CSI-RS or SSB) in an SBFD symbol at an arbitrary terminal, and a DL BWP configured in the terminal includes two non-contiguous DL subbands in the SBFD symbol, as shown in FIG. 10, the terminal may report integrated wideband CQI / PMI feedback information for two DL subbands constituting the DL BWP or report separate wideband CQI / PMI feedback information for each DL subband to the base station. Alternatively, both the DL subband integrated wideband CQI and / or PMI feedback information and the DL subband-specific wideband CQI and / or PMI feedback information may be reported to the base station.

[0157] To this end, the base station can set a wideband CSI (i.e., wideband CQI and / or wideband PMI) reporting mode in the SBFD symbol through the CSI-reportconfig message and transmit it to the corresponding terminal. For example, the base station can set an integrated wideband CQI / PMI reporting mode for the DL subband to the terminal. In this case, the terminal calculates wideband CQI and / or PMI values ​​based on the associated CSI reference signal (CSI-RS or SSB) transmitted in all frequency resources of the first DL subband and the second DL subband and reports them to the base station.

[0158] The base station can set individual wideband CQI / PMI reporting modes for DL ​​subbands. In this case, the terminal can be defined to calculate first wideband CQI and / or PMI feedback information based on a CSI reference signal (CSI-RS or SSB) received through a frequency resource of the first DL subband, and calculate second wideband CQI and / or PMI feedback information based on a CSI reference signal received through a frequency resource of the second DL subband, and report both the first wideband CQI and / or PMI feedback information and the second wideband CQI and / or PMI feedback information to the base station, respectively.

[0159] At this time, the first wideband CQI / PMI feedback information based on the first DL subband and the second wideband CQI / PMI feedback information based on the second DL subband may be multiplexed and reported to the base station through one CSI reporting message. That is, in the case of periodic / semi-persistent reporting, the first wideband CQI / PMI feedback information and the second wideband CQI / PMI feedback information may be multiplexed and transmitted to the base station through PUCCH or PUSCH for each CSI reporting period. Alternatively, the first wideband CQI / PMI feedback information based on the first DL subband and the second wideband CQI / PMI feedback information based on the second DL subband may be reported to the base station through separate CSI reporting messages.

[0160] Additionally, whether the first wideband CQI / PMI and the second wideband CQI / PMI information are multiplexed may be set by the base station via RRC signaling (in case of periodic or semi-persistent CSI reporting) or indicated via DCI (in case of aperiodic or semi-persistent CSI reporting). In this case, the reporting information may include identifier information for distinguishing the first wideband CQI / PMI and the second wideband CQI / PMI, or may be defined to transmit the feedback information in a specific order (e.g., multiplexing in the order of first wideband CQI / PMI -> second wideband CQI / PMI).

[0161] Alternatively, the terminal may report wideband CQI and / or wideband PMI information for a specific DL subband among the first DL subband and the second DL subband to the base station. In this case, the base station may transmit DL subband configuration information (e.g., DL subband ID information) that is a target for wideband CQI and / or wideband PMI information feedback to the terminal through CSI-reportconfig. Alternatively, as one of the wideband CSI reporting modes, the terminal may be configured to report wideband CSI information of a DL subband with better channel quality measured by the terminal among the first DL subband and the second DL subband. In this case, the corresponding CSI reporting information may include DL subband ID information for identifying the DL subband.

[0162] The base station can be configured to report both the DL subband integrated wideband CQI / PMI feedback and the DL subband individual wideband CQI / PMI feedback information. In this case, the terminal can multiplex and report the integrated wideband CQI / PMI feedback information, the first wideband CQI / PMI feedback information, and the second wideband CQI / PMI feedback information through one CSI reporting message. In this case, the reporting information can include identifier information for distinguishing the integrated wideband CQI / PMI feedback information and the first wideband CQI / PMI and the second wideband CQI / PMI, or can be defined to transmit the feedback information in a specific order (e.g., multiplexing in the order of integrated wideband CQI / PMI -> first wideband CQI / PMI -> second wideband CQI / PMI). Alternatively, the base station may be configured to alternately report the integrated wideband CQI / PMI information and the first wideband CQI / PMI and the second wideband CQI / PMI (in case of periodic or semi-persistent CSI reporting).

[0163] Additionally, whether or not to multiplex the integrated wideband CQI / PMI feedback information and the first wideband CQI / PMI and second wideband CQI / PMI information can be set by the base station via RRC signaling (in case of periodic or semi-persistent CSI reporting) or indicated via DCI (in case of aperiodic or semi-persistent CSI reporting).

[0164] Additionally, if any CSI-reportconfig information for wideband CQI and / or wideband PMI feedback reporting in the SBFD symbol for any terminal is an aperiodic reporting configuration, the reporting mode configuration information (e.g., DL subband integrated wideband CSI reporting, DL subband-specific wideband CSI reporting, or wideband CSI reporting for a specific DL subband) may be included and transmitted to the terminal via a DCI format that triggers the aperiodic CSI reporting. In particular, DL subband identifier information may also be indicated to the terminal via the DCI format for wideband CQI or PMI reporting for a specific DL subband.

[0165]

[0166] In addition, the present disclosure proposes a method for setting CSI-RS resources for downlink channel measurement in an arbitrary terminal and a method for setting CSI reporting of the terminal accordingly when an arbitrary cell / network / base station supports SBFD operation as described above.

[0167] Any terminal can multiplex CSI feedback information including a channel measurement result performed on a CSI reference signal (CSI-RS (Channel State Information - Reference Signal) or SSB (Synchronization Signal Block)) transmitted in a non-SBFD symbol and CSI feedback information including a channel measurement result performed on a CSI reference signal transmitted in an SBFD symbol, and transmit the multiplexed CSI feedback information to a base station through a single CSI report message. That is, a single CSI report message can include both a downlink channel measurement result value in a non-SBFD symbol and a downlink channel measurement result value in an SBFD symbol.

[0168] Specifically, when the terminal configures a single CSI feedback message to be transmitted to the base station, the terminal may encode each absolute CSI measurement value based on the CSI-RS (or SSB) received in a non-SBFD symbol and the absolute CSI measurement value based on the CSI-RS (or SSB) received in the SBFD symbol into separate codewords, multiplex them, and report them to the base station through a single PUCCH or PUSCH. Alternatively, the terminal may configure and transmit a single absolute CSI measurement value and a relative CSI value (e.g., a differential CQI value) for the corresponding CSI measurement value. For example, the terminal may report to the base station CSI feedback information including the non-SBFD symbol-targeted CSI feedback information and the SBFD symbol-targeted differential CSI feedback information, including the SBFD symbol-targeted differential CSI value based on the corresponding non-SBFD symbol-targeted CSI information together with the non-SBFD symbol-targeted CSI feedback information (e.g., CQI information). In this way, a terminal supporting SBFD operation can be configured to report CSI feedback information including one or more CSI measurement results to a base station.

[0169] As one method of setting the above-described single CSI report message to include both CSI feedback information measured in a non-SBFD symbol and CSI feedback information measured in an SBFD symbol, a CSI-reportconfig message for any terminal can include separate sub-configuration information for measuring CSI through CSI-RS (or SSB) reception in an SBFD symbol. Specifically, the CSI-reportconfig message set for the terminal includes one CSI-resourceconfig information for CSI measurement, and an NZP-CSI-RS transmission resource or CSI-SSB transmission resource included in the CSI-resourceconfig can include both a CSI-RS transmission resource through a non-SBFD symbol and a CSI-RS transmission resource through an SBFD symbol. In this way, when one CSI-resourceconfig included in CSI-reportconfig includes CSI-RS (or SSB) transmission resources in both non-SBFD symbols and SBFD symbols, the CSI feedback information according to the CSI-reportconfig is calculated by distinguishing between CSI information based on reception of CSI reference signals (CSI-RS or SSB) transmitted through non-SBFD symbols and CSI information based on reception of CSI reference signals transmitted through SBFD symbols, and the results are multiplexed into one CSI reporting message and fed back to the base station. However, at this time, the CSI reference signal transmission resource configuration included in the CSI-resourceconfig includes only resource allocation information for CSI reference signal transmission in non-SBFD symbols, and based on this, sub-configuration information for CSI reference signal transmission in SBFD symbols is included in the CSI-reportconfig and transmitted to the terminal.That is, any CSI-reportconfig can include CSI-resourceconfig information for channel measurement in a non-SBFD symbol, and additional sub-configuration information for channel measurement in an SBFD symbol based on the corresponding CSI-resourceconfig information. The sub-configuration information can include modification information of a CSI-RS transmission or SSB transmission format when CSI-RS or SSB transmission according to the corresponding CSI-resourceconfig is performed through an SBFD symbol, and this can be antenna port sub-configuration information, power offset setting information, codebook restriction setting information, etc. In this way, when the CSI-resourceconfig included in one CSI-reportconfig message includes both CSI-RS transmission in a non-SBFD symbol and an SBFD symbol, and includes sub-configuration information for CSI-RS reception in an SBFD symbol, the terminal can calculate the CSI values ​​for the non-SBFD symbol and the CSI values ​​for the SBFD symbol, respectively, and feed them back to the base station through one CSI report message.

[0170] Alternatively, one CSI-resourceconfig information may include NZP-CSI-RS-Resourceset configuration information or CSI-SSB-Resourceset configuration information for configuring CSI reference signal (CSI-RS or SSB) transmission in non-SBFD symbols, respectively, and NZP-CSI-RS-Resourceset_SBFD or CSI-SSB-Resourceset_SBFD information for configuring CSI reference signal transmission in SBFD symbols separately. That is, one CSI-resourceconfig information includes one NZP-CSI-RS-Resourceset including one or more NZP-CSI-RS-Resource configurations for CSI-RS transmission restricted to non-SBFD symbols, or one CSI-SSB-Resourceset including one or more SSB index information restricted to non-SBFD symbols, respectively. In addition, the CSI-resourceconfig information includes one NZP-CSI-RS-Resourceset_SBFD including one or more NZP-CSI-RS-Resource configurations for CSI-RS transmissions limited to separate SBFD symbols or one CSI-SSB-Resourceset_SBFD information including one or more SSB transmission information limited to SBFD symbols.If the CSI-resourceconfig included in the CSI-reportconfig set for any terminal includes the NZP-CSI-RS-Resourceset or CSI-SSB-Resourceset limited to non-SBFD symbols, as described above, and the NZP-CSI-RS-Resourceset or CSI-SSB-Resourceset limited to SBFD symbols, the terminal multiplexes the CSI feedback information based on the CSI-RS or SSB reception of the non-SBFD symbols and the CSI feedback information based on the CSI-RS or SSB reception of the SBFD symbols into the CSI feedback information according to the CSI-reportconfig and transmits the multiplexed CSI feedback information to the base station. At this time, the number of antenna ports of one NZP-CSI-RS-Resourceset included in one CSI-resourceconfig and one NZP-CSI-RS-Resources included in one NZP-CSI-RS-Resourceset_SBFD can be maintained to have the same number of antenna ports for each resourceset unit (i.e., different numbers of CSI-RS transmission antenna ports can be set between NZP-CSI-RS-Resourceset and NZP-CSI-RS-Resourceset_SBFD), or the same number of antenna ports can be maintained for each CSI-resourceconfig unit (i.e., the same number of CSI-RS transmission antenna ports can be set between NZP-CSI-RS-Resourceset and NZP-CSI-RS-Resourceset_SBFD).

[0171] Alternatively, a single CSI-reportconfig may include an associated CSI resource pair, wherein a CSI-resourceconfig includes CSI-RS (or SSB) transmission resource configurations restricted to non-SBFD symbols and a CSI-resourceconfig_SBFD includes CSI-RS (or SSB) transmission resource configurations restricted to separate SBFD symbols, i.e., one non-SBFD symbol-targeted CSI-resourceconfig and another SBFD symbol-targeted CSI-resourceconfig_SBFD. In this way, when a single CSI-reportconfig includes two different associated CSI-resourceconfigs, the UE multiplexes CSI feedback information based on CSI-RS (or SSB) received in a non-SBFD symbol according to CSI-resourceconfig and CSI feedback information based on CSI-RS (or SSB) received in a SBFD symbol according to CSI-resourceconfig_SBFD into a single CSI report message and transmits the multiplexed CSI feedback information to the base station.

[0172] Alternatively, one NZP-CSI-RS-resource information may include sub-configuration information for CSI-RS transmission targeting SBFD symbols together with CSI-RS transmission resource allocation information for non-SBFD symbols. That is, one NZP-CSI-RS-resource configuration may include sub-configuration information for CSI-RS transmission targeting SBFD symbols together with configurations such as resourceMapping), powercontroloffset, periodicityAndoffset, and QCL (Quasi Co Location) information for CSI-RS transmission targeting non-SBFD symbols. The sub-configuration information may include antenna sub-configuration information for SBFD symbols, powercontroloffset information for SBFD symbols, etc.

[0173] Additionally, when a single CSI report message includes multiple pieces of CSI feedback information through the aforementioned settings, when transmitting wideband or subband CSI feedback information according to the size of the corresponding CSI payload, the CSI feedback information to be included in the corresponding CSI report can be selected based on the priority in the order of type 1 CSI feedback information measured for non-SBFD symbols, type 1 CSI feedback information measured for SBFD symbols, type 2 CSI feedback information measured for non-SBFD symbols, and type 2 CSI feedback information measured for SBFD symbols. Alternatively, the CSI feedback information to be included in the corresponding CSI report can be selected based on the priority in the order of type 1 CSI feedback information measured for non-SBFD symbols, type 2 CSI feedback information measured for non-SBFD symbols, type 1 CSI feedback information measured for SBFD symbols, and type 2 CSI feedback information measured for SBFD symbols.

[0174] However, the above-described transmission of one CSI report message by the terminal to the base station includes all CSI reporting operations, such as transmitting one CSI report to one CSI report instance via PUCCH according to periodic CSI report configuration, transmitting one CSI report message to one CSI report instance via PUCCH or PUSCH according to semi-persistent CSI report configuration and activation, or transmitting one CSI report message to one CSI report instance via PUCCH or PUSCH according to aperiodic CSI report configuration and trigger indication information.

[0175] With respect to the above-described embodiments, each embodiment is included in the scope of the invention according to the present disclosure not only in an independent case but also in all cases in which the embodiments are combined.

[0176]

[0177] Hereinafter, the configuration of a terminal and a base station capable of performing some or all of the embodiments described with reference to FIGS. 1 to 11 will be described with reference to the drawings. The above description may be omitted to avoid redundant description, and in this case, the omitted content may be substantially equally applied to the following description, as long as it does not contradict the technical spirit of the invention.

[0178] Fig. 12 is a drawing showing the configuration of a terminal (1200) according to another embodiment.

[0179] Referring to FIG. 12, a terminal (1200) according to another embodiment includes a transmitter (1220), a receiver (1230), and a control unit (1210) that controls the operations of the transmitter and receiver.

[0180] The control unit (1210) controls the overall operation of the terminal (1200) according to the method of transmitting and receiving downlink channel state information in the wireless mobile communication system required to perform the present invention described above.

[0181] The control unit (1210) may receive SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in the frequency domain and configuration information for a subband-based full duplex (SBFD) symbol. The control unit (1210) may receive information on a time domain and a frequency domain for configuring a downlink subband in an uplink slot or for configuring an uplink subband in a downlink slot. According to an example, the SBFD configuration information may include configuration information for a plurality of non-contiguous downlink subbands and configuration information for at least one uplink subband. In addition, the SBFD configuration information may include configuration information for an SBFD symbol in which an uplink subband and a downlink subband are configured in the frequency domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0182] In this case, the SBFD symbol allocation information may be set to consecutive SBFD symbols within the cycle of a TDD pattern set to one or two. Each pattern setting information may include the cycle setting information of the corresponding pattern, offset information, and duration information. At this time, the duration information may be set to the number of consecutive SBFD symbols from the offset, or may be set to a combination of the number of consecutive SBFD slots and the number of consecutive SBFD symbols. Alternatively, according to an example, the offset may be set to an end point instead of a start point. That is, offset information corresponding to the end point and duration information from the end point may be set.

[0183] For example, the SBFD configuration information may include configuration information for at least two downlink subbands. For example, if an uplink subband is located in the center of the frequency band, two downlink subbands may be configured above and below the uplink subband. In this case, a guard band may be configured between the uplink subband and the downlink subband, and the guard band may be inferred based on frequency resource information for the uplink subband and the downlink subband.

[0184] For example, SBFD configuration information may be received via cell-specific upper layer signaling. That is, the control unit (1210) may receive SBFD subband configuration information from the base station via cell-specific RRC signaling. The control unit (1210) may receive TDD configuration information and SBFD subband configuration information to configure a format for each slot.

[0185] The control unit (1210) may receive wideband CSI reporting configuration information and transmit wideband channel state information based on the wideband CSI reporting configuration information. The control unit (1210) may be configured to report wideband channel state information based on the results of channel state information measurement performed by receiving a downlink reference signal in an SBFD symbol.

[0186] The control unit (1210) may be configured to report subband-integrated wideband channel state information for two downlink subbands configured in an activated downlink bandwidth part (DL BWP). Alternatively, the control unit (1210) may be configured to report subband-specific wideband channel state information for each of the two downlink subbands to the base station. Alternatively, the control unit (1210) may be configured to report both the subband-integrated wideband channel state information and the subband-specific wideband channel state information to the base station.

[0187] To this end, the control unit (1210) can receive a reporting mode for wideband channel state information set by the base station. For example, the control unit (1210) can be set to a reporting mode for subband integrated wideband channel state information. In this case, the control unit (1210) can calculate wideband CQI and / or PMI values ​​based on associated CSI reference signals (CSI-RS or SSB) transmitted on all frequency resources of two downlink subbands and report the subband integrated wideband channel state information to the base station.

[0188] Alternatively, the control unit (1210) may be set to a reporting mode for wideband channel state information for each subband. In this case, the control unit (1210) may obtain first wideband channel state information based on a CSI reference signal (CSI-RS or SSB) received through a frequency resource of a first downlink subband, and second wideband channel state information based on a CSI reference signal received through a frequency resource of a second downlink subband. The control unit (1210) may report both the first wideband channel state information and the second wideband channel state information to the base station.

[0189] For example, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be determined through higher layer signaling received from the base station. That is, the control unit (1210) may be set to either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information through higher layer signaling, such as a CSI-reportconfig message.

[0190] Alternatively, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be indicated through downlink control information or MAC CE signaling that triggers wideband CSI reporting received from the base station. That is, the control unit (1210) may be indicated through downlink control information or MAC CE signaling for either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information.

[0191] Subband integrated wideband channel status information and subband-specific wideband channel status information can be multiplexed and transmitted in a single CSI report message.

[0192] For example, the first wideband channel state information based on the first downlink subband and the second wideband channel state information based on the second downlink subband may be multiplexed and reported to the base station via a single CSI reporting message. That is, in the case of periodic / semi-persistent reporting, the first wideband channel state information and the second wideband channel state information may be multiplexed for each CSI reporting period and transmitted to the base station via the PUCCH or PUSCH. Alternatively, the first wideband channel state information and the second wideband channel state information may be reported to the base station via separate CSI reporting messages.

[0193] In this case, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be set via RRC signaling in the case of periodic or semi-persistent CSI reporting. In addition, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting. In this case, the wideband channel state information for each subband can be transmitted together with ID information for each subband. Alternatively, the CSI reporting information can be configured to be multiplexed and transmitted in a predetermined order, for example, from the first wideband channel state information to the second wideband channel state information.

[0194] Alternatively, according to an example, the control unit (1210) may report wideband channel state information for a specific downlink subband among the first downlink subband and the second downlink subband to the base station. In this case, the control unit (1210) may receive configuration information, for example, downlink subband ID information, for a downlink subband that is a target for wideband channel state information feedback through CSI-reportconfig. Alternatively, the control unit (1210) may be configured to report wideband channel state information of a downlink subband with better channel quality measured by the terminal among the first downlink subband and the second downlink subband. In this case, the corresponding CSI reporting information may include downlink subband ID information for identifying the downlink subband.

[0195] Alternatively, according to an example, the control unit (1210) may be configured to report both the subband-integrated wideband channel state information and the subband-specific wideband channel state information. In this case, the control unit (1210) may multiplex and report the subband-integrated wideband channel state information and the subband-specific wideband channel state information through a single CSI reporting message. In this case, the CSI reporting message may include identifier information for distinguishing the subband-integrated wideband channel state information and the subband-specific wideband channel state information. Alternatively, the CSI reporting message may be configured to be multiplexed in a predetermined order, for example, in the order of subband-integrated wideband channel state information -> first wideband channel state information -> second wideband channel state information. Alternatively, the control unit (1210) may be configured to alternately report the subband-integrated wideband channel state information and the first wideband channel state information and the second wideband channel state information in the case of periodic or semi-persistent CSI reporting.

[0196] Additionally, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be configured via RRC signaling in the case of periodic or semi-persistent CSI reporting. Furthermore, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting.

[0197] Additionally, when CSI reporting configuration information, such as CSI-reportconfig for wideband channel state information reporting in SBFD symbols for terminals, is set to aperiodic reporting, the control unit (1210) may be instructed with configuration information for the aforementioned reporting modes via downlink control information that triggers the aperiodic CSI reporting. In particular, identifier information of a downlink subband for wideband channel state information reporting for a specific downlink subband may also be instructed to the terminal via the corresponding downlink control information.

[0198] Accordingly, a method and device for transmitting and receiving downlink channel state information in an environment where full-duplex communication is applied can be provided.

[0199] Fig. 13 is a drawing showing the configuration of a base station (1300) according to another embodiment.

[0200] Referring to FIG. 13, a base station (1300) according to another embodiment includes a transmitter (1320), a receiver (1330), and a control unit (1310) that controls the operations of the transmitter and receiver.

[0201] The control unit (1310) controls the overall operation of the base station (1300) according to the method of transmitting and receiving downlink channel status information in the wireless mobile communication system required to perform the aforementioned present invention. The transmitter (1320) transmits downlink control information, data, and messages to the terminal through the corresponding channel. The receiver (1330) receives uplink control information, data, and messages from the terminal through the corresponding channel.

[0202] The control unit (1310) may transmit SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in the frequency domain and configuration information for a subband-based full duplex (SBFD) symbol. The control unit (1310) may transmit information for a time domain and a frequency domain for configuring a downlink subband in an uplink slot or for configuring an uplink subband in a downlink slot. According to an example, the SBFD configuration information may include configuration information for a plurality of non-contiguous downlink subbands and configuration information for at least one uplink subband. In addition, the SBFD configuration information may include configuration information for an SBFD symbol in which an uplink subband and a downlink subband are configured in the frequency domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0203] For example, the SBFD configuration information may include configuration information for at least two downlink subbands. For example, if an uplink subband is located in the center of the frequency band, two downlink subbands may be configured above and below the uplink subband. In this case, a guard band may be configured between the uplink subband and the downlink subband, and the guard band may be inferred based on frequency resource information for the uplink subband and the downlink subband.

[0204] For example, SBFD configuration information may be transmitted via cell-specific upper layer signaling. That is, the control unit (1310) may transmit SBFD subband configuration information to the terminal via cell-specific RRC signaling. The terminal may receive the TDD configuration information and SBFD subband configuration information and configure a format for each slot.

[0205] The control unit (1310) can transmit wideband CSI reporting configuration information and receive wideband channel state information based on the wideband CSI reporting configuration information. The control unit (1310) can configure the terminal to report wideband channel state information based on the results of channel state information measurement performed by receiving a downlink reference signal, such as a CSI-RS or SSB, in an SBFD symbol.

[0206] The control unit (1310) may configure the terminal to report subband-integrated wideband channel state information for two downlink subbands configured in an activated downlink bandwidth part (DL BWP). Alternatively, the control unit (1310) may configure the terminal to report subband-specific wideband channel state information for each of the two downlink subbands to the base station. Alternatively, the control unit (1310) may configure the terminal to report both the subband-integrated wideband channel state information and the subband-specific wideband channel state information to the base station.

[0207] To this end, the control unit (1310) may transmit a reporting mode for the configured wideband channel state information to the terminal. For example, the control unit (1310) may set the terminal to a reporting mode for subband-integrated wideband channel state information. In this case, the terminal may calculate wideband CQI and / or PMI values ​​based on associated CSI reference signals (CSI-RS or SSB) transmitted on all frequency resources of two downlink subbands and report the subband-integrated wideband channel state information to the base station.

[0208] Alternatively, the control unit (1310) may set the terminal to a reporting mode for wideband channel state information for each subband. In this case, the terminal may obtain first wideband channel state information based on a CSI reference signal (CSI-RS or SSB) received through a frequency resource of a first downlink subband, and second wideband channel state information based on a CSI reference signal received through a frequency resource of a second downlink subband. The terminal may report both the first wideband channel state information and the second wideband channel state information to the base station.

[0209] For example, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be determined through higher layer signaling transmitted by the control unit (1310). That is, the terminal may be set to either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information through higher layer signaling, such as a CSI-reportconfig message.

[0210] Alternatively, whether to transmit subband-integrated wideband channel state information and subband-specific wideband channel state information may be indicated through downlink control information or MAC CE signaling that triggers wideband CSI reporting transmitted by the control unit (1310). That is, the terminal may be indicated through downlink control information or MAC CE signaling for either a reporting mode for subband-integrated wideband channel state information or a reporting mode for subband-specific wideband channel state information.

[0211] Subband integrated wideband channel status information and subband-specific wideband channel status information can be multiplexed and transmitted in a single CSI report message.

[0212] For example, the first wideband channel state information based on the first downlink subband and the second wideband channel state information based on the second downlink subband may be multiplexed and received by the control unit (1310) through a single CSI reporting message. That is, in the case of periodic / semi-persistent reporting, the first wideband channel state information and the second wideband channel state information may be multiplexed for each CSI reporting period and received by the control unit (1310) through the PUCCH or the PUSCH. Alternatively, the first wideband channel state information and the second wideband channel state information may be received by the control unit (1310) through separate CSI reporting messages.

[0213] In this case, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be set via RRC signaling in the case of periodic or semi-persistent CSI reporting. In addition, whether the first wideband channel state information and the second wideband channel state information are multiplexed can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting. In this case, the wideband channel state information for each subband can be transmitted together with ID information for each subband. Alternatively, the CSI reporting information can be configured to be multiplexed and transmitted in a predetermined order, for example, from the first wideband channel state information to the second wideband channel state information.

[0214] Alternatively, according to an example, the control unit (1310) may receive wideband channel state information for a specific downlink subband among the first downlink subband and the second downlink subband from the terminal. In this case, the control unit (1310) may transmit configuration information for a downlink subband that is a target for wideband channel state information feedback, for example, downlink subband ID information, to the terminal through CSI-reportconfig. Alternatively, the control unit (1310) may configure the terminal to report wideband channel state information for a downlink subband with better channel quality measured by the terminal among the first downlink subband and the second downlink subband. In this case, the corresponding CSI reporting information may include downlink subband ID information for identifying the downlink subband.

[0215] Alternatively, according to an example, the control unit (1310) may configure the terminal to report both the subband-integrated wideband channel state information and the subband-specific wideband channel state information. In this case, the terminal may multiplex and report the subband-integrated wideband channel state information and the subband-specific wideband channel state information through a single CSI reporting message. In this case, the CSI reporting message may include identifier information for distinguishing the subband-integrated wideband channel state information and the subband-specific wideband channel state information. Alternatively, the CSI reporting message may be configured to be multiplexed in a predetermined order, for example, subband-integrated wideband channel state information -> first wideband channel state information -> second wideband channel state information. Alternatively, the control unit (1310) may configure the terminal to alternately report the subband-integrated wideband channel state information and the first wideband channel state information and the second wideband channel state information in the case of periodic or semi-persistent CSI reporting.

[0216] Additionally, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be configured via RRC signaling in the case of periodic or semi-persistent CSI reporting. Furthermore, whether to multiplex subband-integrated wideband channel state information and subband-specific wideband channel state information can be indicated via DCI in the case of aperiodic or semi-persistent CSI reporting.

[0217] Additionally, when CSI reporting configuration information, such as CSI-reportconfig for wideband channel state information reporting in SBFD symbols for terminals, is set to aperiodic reporting, the control unit (1310) can instruct the terminal about the configuration information for the aforementioned reporting modes through downlink control information that triggers the aperiodic CSI reporting. In particular, identifier information of a downlink subband for wideband channel state information reporting for a specific downlink subband can also be instructed to the terminal through the downlink control information.

[0218] Accordingly, a method and device for transmitting and receiving downlink channel state information in an environment where full-duplex communication is applied can be provided.

[0219] The above-described embodiments may be supported by standard documents disclosed in at least one of the wireless access systems, IEEE 802, 3GPP, and 3GPP2. That is, steps, components, and parts not described in the present embodiments to clearly illustrate the technical concepts herein may be supported by the above-described standard documents. Furthermore, all terms disclosed in this specification may be explained by the above-described standard documents.

[0220] The embodiments described above may be implemented through various means. For example, the embodiments may be implemented through hardware, firmware, software, or a combination thereof.

[0221] In the case of hardware implementation, the method according to the present embodiments may be implemented by one or more ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, or microprocessors.

[0222] When implemented using firmware or software, the methods according to the present embodiments may be implemented in the form of devices, procedures, or functions that perform the functions or operations described above. The software code may be stored in a memory unit and executed by a processor. The memory unit may be located within or outside the processor and may exchange data with the processor using various known means.

[0223] Additionally, terms such as "system," "processor," "controller," "component," "module," "interface," "model," or "unit" as described above may generally refer to a computer-related entity, such as hardware, a combination of hardware and software, software, or software in execution. For example, the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, a thread of execution, a program, and / or a computer. For example, both an application running on a controller or a processor and the controller or the processor may be components. One or more components may be within a process and / or thread of execution, and the components may be located on a single device (e.g., a system, a computing device, etc.) or distributed across two or more devices.

[0224] The above description is merely an illustrative example of the technical idea of ​​the present disclosure, and those skilled in the art to which the present disclosure pertains will appreciate that various modifications and variations can be made without departing from the essential characteristics of the technical idea of ​​the present disclosure. In addition, the present embodiments are not intended to limit the technical idea of ​​the present disclosure but rather to explain it, and therefore the scope of the technical idea of ​​the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included within the scope of the rights of the present disclosure.

[0225]

[0226] CROSS-REFERENCE TO RELATED APPLICATION

[0227] This patent application claims priority under 35 USC §119(a) to Korean Patent Application No. 10-2024-0018461, filed in Korea on February 6, 2024, and Korean Patent Application No. 10-2025-0014694, filed in Korea on February 5, 2025, the entire contents of which are incorporated herein by reference. In addition, this patent application claims priority in countries other than the United States for the same reasons, the entire contents of which are incorporated herein by reference.

Claims

1. In a method for a terminal to transmit downlink channel state information (CSI), A step of receiving SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in a frequency domain and configuration information for a subband full duplex (SBFD) symbol; A step of receiving wideband CSI reporting configuration information; and A step of transmitting wideband channel state information based on the above wideband CSI reporting configuration information, A method in which the wideband channel state information in the above SBFD symbol is divided into subband integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

2. In paragraph 1, A method in which whether to transmit the above subband integrated wideband channel state information and the above subband-specific wideband channel state information is determined through higher layer signaling received from a base station.

3. In paragraph 1, A method in which whether to transmit the above subband integrated wideband channel state information and the above subband-specific wideband channel state information is indicated through a downlink control information format (DCI format) or MAC CE (medium access control control element) signaling that triggers a wideband CSI report received from a base station.

4. In paragraph 1, A method in which the above subband integrated wideband channel state information and the above subband-specific wideband channel state information are multiplexed and transmitted in one CSI report message.

5. In paragraph 1, A method in which the above wideband channel status information for each subband is transmitted together with ID information for each subband.

6. In a method for a base station to receive downlink channel state information (CSI), A step of transmitting SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in a frequency domain and configuration information for a subband full duplex (SBFD) symbol; A step of transmitting wideband CSI reporting configuration information; and A step of receiving wideband channel status information based on the above wideband CSI reporting configuration information, A method in which the wideband channel state information in the above SBFD symbol is divided into subband integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

7. In paragraph 6, A method in which whether or not to receive the above subband integrated wideband channel state information and the above subband-specific wideband channel state information is determined through higher layer signaling transmitted from the base station.

8. In paragraph 6, A method in which whether or not to receive the above subband integrated wideband channel state information and the above subband-specific wideband channel state information is indicated through a downlink control information format (DCI format) or MAC CE (medium access control control element) signaling that triggers a wideband CSI report transmitted from the base station.

9. In paragraph 6, A method in which the above subband integrated wideband channel state information and the above subband-specific wideband channel state information are multiplexed and received in one CSI report message.

10. In paragraph 6, A method in which the above wideband channel status information for each subband is received together with ID information for each subband.

11. In a terminal transmitting downlink channel state information (CSI), Transmitter; Receiver; and Including a control unit that controls the operation of the above transmitter and receiver, The above control unit, Receive SBFD configuration information including configuration information for a plurality of non-contiguous downlink subbands in a frequency domain and configuration information for a subband-based full duplex (SBFD) symbol, receive wideband CSI reporting configuration information, and transmit wideband channel state information based on the wideband CSI reporting configuration information. A terminal in which the wideband channel state information in the above SBFD symbol is divided into subband integrated wideband channel state information and subband-specific wideband channel state information for each of the plurality of downlink subbands.

12. In paragraph 11, A terminal in which whether to transmit the above subband integrated wideband channel state information and the above subband-specific wideband channel state information is determined through higher layer signaling received from the base station.

13. In paragraph 11, A terminal that is instructed to transmit the above subband integrated wideband channel state information and the above subband-specific wideband channel state information through a downlink control information format (DCI format) or MAC CE (medium access control control element) signaling that triggers a wideband CSI report received from a base station.

14. In paragraph 11, A terminal in which the above subband integrated wideband channel state information and the above subband-specific wideband channel state information are multiplexed and transmitted in one CSI report message.

15. In paragraph 11, The above wideband channel status information for each subband is transmitted to the terminal together with ID information for each subband.

Images