Method and apparatus for performing communication in wireless mobile communication system

Abstract

The present embodiments relate to a method for performing communication by a terminal, the method comprising the steps of: receiving subband full duplex (SBFD) configuration information including configuration information on at least one uplink subband and at least one downlink subband and configuration information on an SBFD symbol; receiving SBFD-associated bandwidth part (BWP) configuration information; and performing communication with a base station according to a slot format determined on the basis of the SBFD configuration information and the SBFD-associated BWP configuration information.

Description

Method and device for performing communication in a wireless mobile communication system

[0001] The present embodiments propose a method and apparatus for performing communication 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. However, this limitation of uplink slots negatively impacts coverage and latency. Full duplex communication has recently attracted attention as a technology to address these issues.

[0003] In a full-duplex communication environment, particularly where full-duplex communication is configured on a symbol or slot basis based on subbands, communication can be performed using the bandwidth part configured for the terminal and the uplink and downlink subbands according to the full-duplex communication settings. In this regard, when the type of full-duplex communication is configured in various ways on a symbol or slot basis, a specific design is required to determine the type of slot used for communication between the terminal and the base station in relation to the bandwidth part.

[0004] Embodiments of the present disclosure can provide a method and device for performing communication in a wireless mobile communication system.

[0005] In one aspect, the present embodiments may provide a method for a terminal to perform communication, the method including: receiving SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol; receiving SBFD-associated bandwidth part (BWP) configuration information; and performing communication with a base station according to a slot format determined based on the SBFD configuration information and the SBFD-associated BWP configuration information.

[0006] In another aspect, the present embodiments may provide a method in which a base station performs communication, the method including: transmitting SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol; transmitting SBFD-associated bandwidth part (BWP) configuration information; and performing communication with a terminal according to a slot format determined based on the SBFD configuration information and the SBFD-associated BWP configuration information.

[0007] In another aspect, the present embodiments may provide a terminal for performing communication, comprising a transmitter, a receiver, and a control unit for controlling operations of the transmitter and the receiver, wherein the control unit receives SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol, receives SBFD-related bandwidth part (BWP) configuration information, and performs communication with a base station according to a slot format determined based on the SBFD configuration information and the SBFD-related BWP configuration information.

[0008] In another aspect, the present embodiments may provide a base station for performing communication, comprising a transmitter, a receiver, and a control unit for controlling operations of the transmitter and the receiver, wherein the control unit transmits SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol, transmits SBFD-related bandwidth part (BWP) configuration information, and performs communication with a terminal according to a slot format determined based on the SBFD configuration information and the SBFD-related BWP configuration information.

[0009] According to the present embodiments, a method and device for performing communication in an environment where full-duplex communication is applied can be provided. That is, a method and device for determining the format of a slot used for performing communication in an environment where full-duplex communication is applied can be provided.

[0010] FIG. 1 is a schematic diagram illustrating the structure of an NR wireless communication system to which the present embodiment can be applied.

[0011] FIG. 2 is a drawing for explaining a frame structure in an NR system to which the present embodiment can be applied.

[0012] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0013] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0014] 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.

[0015] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0016] Figure 7 is a drawing for explaining CORESET.

[0017] FIG. 8 is a diagram illustrating an example in which an uplink subband is set in an arbitrary downlink slot according to one embodiment.

[0018] FIG. 9 is a diagram illustrating another example in which an uplink subband is set in an arbitrary downlink slot according to one embodiment.

[0019] FIG. 10 is a diagram illustrating a procedure for a terminal to perform communication according to one embodiment.

[0020] FIG. 11 is a diagram illustrating a procedure for a base station to perform communication 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 technology 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 operating 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 / NACK 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 a given serving cell is defined, one or more UE-specific bandwidth parts 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]

[0093] The present disclosure proposes a method for transmitting and receiving a downlink data channel between a base station and a terminal to support full-duplex communication.

[0094] 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.

[0095] 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.

[0096] FIG. 8 is a diagram illustrating an example in which an uplink subband is set in an arbitrary downlink slot according to one embodiment. FIG. 9 is a diagram illustrating another example in which an uplink subband is set in an arbitrary downlink slot according to one embodiment.

[0097] That is, FIGS. 8 and 9 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. 8, or at the edge of the frequency band, as shown in FIG. 9. In this case, a guard band may be set between the UL subband and the downlink subband (DL subband) in the slot.

[0098] 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. 8, 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. 9, 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.

[0099] 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.

[0100] According to the slot configuration method described above, any one symbol can be set or indicated as one of DL, UL, or Flexible. FIG. 8 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 that a slot 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.

[0101] However, as shown in FIGS. 8 and 9, 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.

[0102] 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. As mentioned above, this is for convenience of explanation and is not limited to the terminology.

[0103]

[0104] Below, a method for performing communication in a wireless mobile communication system will be specifically described with reference to related drawings.

[0105] FIG. 10 is a diagram illustrating a procedure (1000) in which a terminal performs communication according to one embodiment.

[0106] Referring to FIG. 10, a terminal can receive SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband full duplex (SBFD) symbol (S1010).

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] To this end, the terminal may receive SBFD configuration information. That is, the terminal 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 on at least one uplink subband and at least one downlink 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. Alternatively, the SBFD configuration information may include information on a frequency domain in which a guard band is configured and information on a time domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0113] In addition, for configuring SBFD subbands, time resource information for uplink subbands can be set based on reference subcarrier spacing (SCS) information and pattern setting information. In this case, the time resource information can be set based on the reference subcarrier spacing (SCS) included in the TDD configuration information. That is, as described above, the reference subcarrier spacing (SCS) setting included in the TDD configuration information can be used as a reference SCS for setting time resources for configuring uplink subbands.

[0114] Additionally, time resource information can be set based on the number of TDD patterns and the period of the patterns included in the TDD configuration information. That is, as described above, the settings for Pattern 1 and Pattern 2 included in the TDD configuration information can be used as pattern setting information for setting time resources for configuring an uplink subband.

[0115] 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 cycle setting information, offset information, and duration information of the corresponding pattern. 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.

[0116] For configuring SBFD subbands, frequency resource configuration information for uplink subbands may be configured in units of common resource blocks (CRBs). In this case, frequency resource configuration for uplink subbands may be accompanied by guardband configuration or downlink subband configuration within the same symbol / slot. That is, frequency resource configuration information for uplink subbands may include at least one of guardbands accompanying an SBFD slot or SBFD symbol in which the uplink subband is configured, or frequency resource configuration information for downlink subbands. In this case, time resource configuration information for the guardband or downlink subbands may be configured according to the time resource configuration information of the uplink subband.

[0117] For example, for configuring SBFD subbands, frequency resource information for an uplink subband may include configuration information for one uplink subband and one or two guard bands based on a CRB. In this case, if the uplink subband is located in the center of the frequency band, two guard bands may be configured above and below the uplink subband. Alternatively, if the uplink subband is located at the upper boundary of the frequency band, one guard band may be configured below the uplink subband. Alternatively, if the uplink subband is located at the lower boundary of the frequency band, one guard band may be configured above the uplink subband. Accordingly, configuration information for one or two guard bands may be included in the frequency resource information. In this case, a downlink subband may be configured with a guard band in between, and the downlink subband may be inferred from the frequency resource information for the uplink subband and the guard band.

[0118] In another example, for configuring SBFD subbands, frequency resource information for an uplink subband may include configuration information for one uplink subband and one or two downlink subbands based on a CRB. In this case, if the uplink subband is located in the center of the frequency band, two downlink subbands may be configured above and below the uplink subband. Alternatively, if the uplink subband is located at the upper boundary of the frequency band, one downlink subband may be configured below the uplink subband. Alternatively, if the uplink subband is located at the lower boundary of the frequency band, one downlink subband may be configured above the uplink subband. Accordingly, configuration information for one or two downlink subbands may be included in the frequency resource information. 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 the frequency resource information for the uplink subband and the downlink subband.

[0119] 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.

[0120] Referring again to FIG. 10, the terminal receives SBFD-related bandwidth part (BWP) setting information (S1020) and can perform communication with the base station according to a slot format determined based on the SBFD configuration information and SBFD-related BWP setting information (S1030).

[0121] A terminal may receive one or more, up to four, downlink / uplink (DL / UL) bandwidth part (BWP) pairs from a base station. Here, a DL / UL bandwidth part pair may mean a DL BWP and a UL BWP, each having the same BWP-ID and center frequency.

[0122] If the SBFD operation is not supported, the terminal receives the downlink through the DL BWP activated in the symbol set to downlink (DL) through the aforementioned 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated', which are Time Division Duplex (TDD) configuration information. Similarly, the terminal transmits the uplink through the UL BWP activated in the symbol set to uplink (UL) through the TDD configuration information. In addition, if the terminal additionally receives slot format indication information through DCI format 2_0 for a symbol set to flexible, the terminal can perform downlink reception through the DL BWP in the symbol indicated as DL, and perform uplink transmission through the UL BWP in the symbol indicated as UL. Alternatively, for flexible symbols, DL reception via DL BWP and UL transmission via UL BWP may be indicated according to the scheduling DCI format.

[0123] In contrast, when the SBFD operation is supported, the terminal may receive SBFD-associated BWP configuration information (hereinafter also referred to as 'SBFD associated DL / UL BWP pair configuration information'). The SBFD-associated BWP configuration information may include information for configuring one of a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as an SBFD-associated BWP pair (hereinafter also referred to as 'SBFD associated DL / UL BWP pair'). That is, among one or more DL / UL BWP pairs configured for the terminal, one DL-UL BWP pair for supporting the SBFD operation may be configured as the SBFD-associated BWP pair. This is an example, and the technical spirit of the present disclosure is not limited by the name, and may be referred to by other names. According to an example, the SBFD-associated BWP pair may be configured to have at least the same center frequency as an uplink subband (UL subband) configured according to the SBFD configuration information.

[0124] For example, the SBFD-associated BWP configuration information may include identification information for the SBFD-associated BWP pair and slot format configuration information in the SBFD symbol. That is, the SBFD-associated BWP configuration information may include an ID configuration information area for a DL / UL BWP pair configured as the SBFD-associated BWP pair among one or more DL / UL BWP pairs configured for the corresponding terminal.

[0125] In addition, the SBFD-associated BWP configuration information may include slot format configuration information in an SBFD symbol to be applied by the terminal when the corresponding SBFD-associated BWP pair is activated. The slot format information may include SBFD slot / symbol configuration information for indicating whether the terminal performs uplink transmission using a UL subband or downlink reception using a DL subband in the SBFD symbol. In this way, when the SBFD-associated BWP pair is configured in the terminal, the terminal can determine the slot format, particularly, the slot format in the SBFD symbol, depending on whether the activated DL / UL BWP pair is an SBFD-associated BWP pair.

[0126] For example, if a pair of uplink BWP and downlink BWP activated for a terminal is an SBFD-associated BWP pair, the terminal can determine a slot format for the SBFD symbol based on slot format configuration information in the SBFD symbol. That is, if an SBFD-associated BWP pair is activated from the base station, the terminal can perform downlink reception and uplink transmission operations by applying slot format configuration information in the SBFD symbol included in the SBFD-associated BWP configuration information.

[0127] That is, the terminal can perform a downlink reception operation through an SBFD-associated DL BWP in a DL symbol or a flexible symbol according to existing TDD configuration information for a non-SBFD symbol that does not include a UL / DL subband, and can perform an uplink transmission operation through an SBFD-associated UL BWP in a UL symbol or a flexible symbol. On the other hand, in the case of an SBFD symbol, slot format configuration information newly set for the SBFD symbol may be applied, not the configuration according to existing TDD configuration information. That is, when the SBFD symbol is set to DL by the slot format configuration information in the SBFD symbol, the terminal can perform a reception operation for a downlink radio channel and radio signal through the DL subband. If the SBFD symbol is set to UL by the slot format configuration information in the SBFD symbol, the terminal can perform a transmission operation for an uplink radio channel and radio signal through the UL subband.

[0128] The above description assumes that the SBFD-related BWP configuration information includes slot format configuration information in the SBFD symbol, but is not limited thereto. Alternatively, the slot format configuration information in the SBFD symbol may be transmitted to the terminal via separate upper layer signaling or L1 / L2 signaling. Even in this case, the above description may be substantially identically applied.

[0129] In another example, if a pair of uplink BWP and downlink BWP activated for a terminal is not an SBFD-associated BWP pair, the terminal may determine a slot format for an SBFD symbol according to the TDD configuration information. That is, if a DL / UL BWP pair activated by the base station is not an SBFD-associated BWP pair, the terminal may apply the existing TDD configuration information or the DL / UL and flexible symbol setting / indication information by DCI format 2_0 to all symbols. Hereinafter, for the convenience of explanation, a DL / UL BWP pair that is not an SBFD-associated BWP pair is referred to as a non-SBFD-associated BWP pair. However, it should be understood that the present invention is not limited to this term.

[0130] In this case, the terminal can determine the slot format based on the TDD configuration information not only for non-SBFD symbols that do not include DL / UL subbands, but also for SBFD symbols that include DL / UL subbands. Accordingly, the terminal can perform a reception operation for a downlink radio channel and radio signal in a DL symbol or a flexible symbol, and perform a transmission operation for an uplink radio channel and radio signal in a UL symbol or a flexible symbol.

[0131] However, in this case, for example, if a DL symbol according to TDD configuration information, or a flexible symbol for which DL reception is set / instructed, is set to an SBFD symbol including a UL / DL subband according to an SBFD subband setting, and the frequency resources of the corresponding non-SBFD associated DL BWP include at least a portion of a UL subband or guard band, the terminal may exclude downlink reception through the frequency resources of the UL subband or guard band in the corresponding SBFD symbol. That is, if the symbol set to DL is an SBFD symbol, the terminal may be configured not to use the UL subband or guard band configured in the corresponding symbol when performing downlink reception.

[0132] Similarly, if a UL symbol according to TDD configuration information, or a flexible symbol for which UL transmission is set / instructed, is set to an SBFD symbol including UL / DL subbands according to SBFD subband settings, and the frequency resources of the corresponding non-SBFD associated UL BWP include at least some of the DL subbands or guard bands, the terminal may exclude uplink transmission through the frequency resources of the DL subbands or guard bands in the corresponding SBFD symbol. That is, if a symbol set to UL is an SBFD symbol, the terminal may be configured not to use the DL subbands or guard bands configured in the corresponding symbol when performing uplink transmission.

[0133] Here, excluding downlink reception and uplink transmission at the terminal may mean dropping the allocated radio channel or the radio signal transmission itself, or dropping only transmissions in overlapping frequency resources, for example, applying puncturing or rate matching.

[0134] Afterwards, the terminal can communicate with the base station by applying the determined slot format.

[0135] Accordingly, a method and device can be provided that can determine the format of a slot used to perform communication in an environment where full-duplex communication is applied.

[0136] FIG. 11 is a diagram illustrating a procedure (1100) for a base station to perform communication according to one embodiment. The description given above in FIG. 10 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.

[0137] Referring to FIG. 11, a base station can transmit SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband full duplex (SBFD) symbol (S1110).

[0138] The base station can operate in TDD (Time Division Duplex) mode. TDD is a method of using time-interval radio resources by dividing them into downlink and uplink slots. The base station can transmit TDD configuration information to the terminal to determine the format of symbols within the slot. 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 transmitted via upper layer signaling or physical layer (L1) signaling.

[0139] 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 base station can transmit to the 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.

[0140] Alternatively, the base station may indicate a dynamic slot format to the UE via a UE-group common PDCCH. For example, the UE may be dynamically instructed to indicate the slot format via DCI format 2_0.

[0141] 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.

[0142] 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 a terminal, or to be utilized as flexible symbols for downlink / uplink transitions.

[0143] To this end, the base station may transmit SBFD configuration information to the terminal. That is, the base station may transmit 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 on at least one uplink subband and at least one downlink 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. Alternatively, the SBFD configuration information may include information on a frequency domain in which a guard band is configured and information on a time domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0144] For example, SBFD configuration information can be received 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.

[0145] Referring again to FIG. 11, the base station transmits SBFD-related bandwidth part (BWP) setting information (S1120) and can perform communication with the terminal according to a slot format determined based on SBFD configuration information and SBFD-related BWP setting information (S1130).

[0146] A base station can configure one or more, up to four, downlink / uplink (DL / UL) bandwidth part (BWP) pairs for a terminal. Here, a DL / UL bandwidth part pair may mean a DL BWP and an UL BWP, each having the same BWP-ID and center frequency.

[0147] If the SBFD operation is not supported, the base station transmits the downlink through the DL BWP activated in the symbol set to downlink (DL) through the aforementioned 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated', which are Time Division Duplex (TDD) configuration information. Similarly, the base station transmits the uplink through the UL BWP activated in the symbol set to uplink (UL) through the TDD configuration information. In addition, if the base station additionally transmits slot format indication information through DCI format 2_0 for a symbol set to flexible, the base station can perform downlink transmission through the DL BWP in the symbol indicated as DL, and perform uplink reception through the UL BWP in the symbol indicated as UL. Alternatively, for flexible symbols, the base station can instruct the terminal to receive DL through DL BWP and transmit UL through UL BWP through scheduling DCI format.

[0148] In contrast, when the SBFD operation is supported, the base station may transmit SBFD-associated BWP configuration information to the terminal. The SBFD-associated BWP configuration information may include information for configuring one of a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as the SBFD-associated BWP pair. That is, among one or more DL / UL BWP pairs configured for the terminal, one DL-UL BWP pair for supporting the SBFD operation may be configured as the SBFD-associated BWP pair. In one example, the SBFD-associated BWP pair may be configured to have at least the same center frequency as an uplink subband (UL subband) configured according to the SBFD configuration information.

[0149] For example, the SBFD-associated BWP configuration information may include identification information for the SBFD-associated BWP pair and slot format configuration information in the SBFD symbol. That is, the SBFD-associated BWP configuration information may include an ID configuration information area for a DL / UL BWP pair configured as the SBFD-associated BWP pair among one or more DL / UL BWP pairs configured for the corresponding terminal.

[0150] In addition, the SBFD-associated BWP configuration information may include slot format configuration information in an SBFD symbol to be applied by the terminal when the corresponding SBFD-associated BWP pair is activated. The slot format information may include SBFD slot / symbol configuration information for indicating whether the base station performs uplink reception using a UL subband or downlink transmission using a DL subband in the SBFD symbol. In this way, when the SBFD-associated BWP pair is configured in the terminal, the base station can determine the slot format, particularly, the slot format in the SBFD symbol, depending on whether the activated DL / UL BWP pair is an SBFD-associated BWP pair.

[0151] For example, if a pair of uplink BWP and downlink BWP activated for a terminal is an SBFD-associated BWP pair, the base station can determine a slot format for the SBFD symbol based on slot format configuration information in the SBFD symbol. That is, if an SBFD-associated BWP pair is activated for the terminal, the base station can perform downlink transmission and uplink reception operations by applying slot format configuration information in the SBFD symbol included in the SBFD-associated BWP configuration information.

[0152] That is, the base station can perform a downlink transmission operation through an SBFD-associated DL BWP in a DL symbol or a flexible symbol according to existing TDD configuration information for a non-SBFD symbol that does not include an UL / DL subband, and can perform an uplink reception operation through an SBFD-associated UL BWP in a UL symbol or a flexible symbol. On the other hand, in the case of an SBFD symbol, slot format configuration information newly set for the SBFD symbol may be applied, not the configuration according to existing TDD configuration information. That is, when the SBFD symbol is set to DL by the slot format configuration information in the SBFD symbol, the base station can perform a transmission operation for a downlink wireless channel and wireless signal through the DL subband. If the SBFD symbol is set to UL by the slot format configuration information in the SBFD symbol, the base station can perform a reception operation for an uplink wireless channel and wireless signal through the UL subband.

[0153] The above description assumes that the SBFD-related BWP configuration information includes slot format configuration information in the SBFD symbol, but is not limited thereto. Alternatively, the base station may transmit slot format configuration information in the SBFD symbol to the terminal via separate upper layer signaling or L1 / L2 signaling. In this case, the above description may be substantially applied in the same manner.

[0154] In another example, if the pair of uplink BWP and downlink BWP activated for the terminal is not an SBFD-associated BWP pair, the base station may determine the slot format for the SBFD symbol according to the TDD configuration information. That is, if the pair of DL / UL BWP activated for the terminal is not an SBFD-associated BWP pair, the base station may transmit to the terminal the existing TDD configuration information or the DL / UL and flexible symbol configuration / indication information by DCI format 2_0 in all symbols.

[0155] In this case, the base station can determine the slot format based on the TDD configuration information not only for non-SBFD symbols that do not include DL / UL subbands, but also for SBFD symbols that include DL / UL subbands. Accordingly, the base station can perform a transmission operation for a downlink radio channel and radio signal in a DL symbol or a flexible symbol, and perform a reception operation for an uplink radio channel and radio signal in a UL symbol or a flexible symbol.

[0156] However, in this case, for example, if a DL symbol according to TDD configuration information for a terminal, or a flexible symbol for which DL reception is set / instructed, is set to an SBFD symbol including a UL / DL subband according to an SBFD subband setting, and the frequency resources of the corresponding non-SBFD associated DL BWP include at least a portion of a UL subband or guard band, the terminal may exclude downlink reception through the frequency resources of the UL subband or guard band in the corresponding SBFD symbol. That is, if a symbol set to DL is an SBFD symbol, the terminal may be configured not to use the UL subband or guard band configured in the corresponding symbol when performing downlink reception.

[0157] Similarly, if a UL symbol according to TDD configuration information, or a flexible symbol for which UL transmission is set / instructed, is set to an SBFD symbol including UL / DL subbands according to SBFD subband settings, and the frequency resources of the corresponding non-SBFD associated UL BWP include at least some of the DL subbands or guard bands, the terminal may exclude uplink transmission through the frequency resources of the DL subbands or guard bands in the corresponding SBFD symbol. That is, if a symbol set to UL is an SBFD symbol, the terminal may be configured not to use the DL subbands or guard bands configured in the corresponding symbol when performing uplink reception.

[0158] Here, excluding downlink reception and uplink transmission at the terminal may mean dropping the allocated radio channel or the radio signal transmission itself, or dropping only transmissions in overlapping frequency resources, for example, applying puncturing or rate matching.

[0159] Afterwards, the base station can communicate with the terminal by applying the determined slot format.

[0160] Accordingly, a method and device can be provided that can determine the format of a slot used to perform communication in an environment where full-duplex communication is applied.

[0161]

[0162] Below, each embodiment related to a method for performing communication in a wireless mobile communication system will be specifically described with reference to related drawings.

[0163] Hereinafter, a method for setting up an association between a downlink / uplink (DL / UL) bandwidth part (BWP) pair set in an arbitrary terminal and an uplink subband (UL subband) and downlink subband (DL subband) setting for the SBFD operation and a slot format setting method according to the association is proposed.

[0164] When a network / base station operates an NR-based wireless cell on a single carrier frequency configured through an arbitrary unpaired spectrum, the base station can configure up to four DL / UL BWP pairs for a terminal accessing an arbitrary cell configured by the base station. Here, the DL / UL BWP configured for an arbitrary terminal means each DL BWP and UL BWP having the same BWP-ID and center frequency, respectively.

[0165] Existing terminals receive downlink through the DL BWP activated for the terminal in symbols set to downlink (DL) through the aforementioned 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated'. On the other hand, the terminal transmits uplink through the UL BWP activated for the terminal in symbols set to UL through 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated'. In addition, the terminal can perform downlink reception through the DL BWP in symbols indicated as DL and uplink transmission through the UL BWP in symbols indicated as UL by additionally receiving slot format indication information through DCI format 2_0 for symbols set as flexible. Alternatively, for flexible symbols, DL reception via DL BWP and UL transmission via UL BWP may be indicated according to the scheduling DCI format.

[0166] As described above, the base station may configure up to one UL subband and one or two DL subbands in the corresponding carrier bandwidth to support SBFD operation. In this case, the UL subband and DL subband for supporting SBFD operation may be configured to target one or more symbols configured as DL or flexible symbols via the 'tdd-UL-DL-ConfigurationCommon'.

[0167] Any terminal supporting SBFD operation supports UL transmission through the UL subband and DL reception through the DL subband through any SBFD symbol in which the UL subband and DL subband are configured. Therefore, if any DL / UL BWP pair configured for the terminal includes the SBFD subbands, i.e., the UL and DL subbands and their corresponding guardbands, and the DL / UL BWP pair is activated, it is necessary to clearly configure whether the terminal will perform downlink reception through the DL subband or uplink transmission through the UL subband in the SBFD symbol. To this end, the present disclosure proposes a method for configuring a slot format for a terminal supporting SBFD.

[0168] As described above, a subband configuration for supporting SBFD operation can be performed by a base station in an arbitrary carrier. The terminal receives UL subband and DL subband configuration information for the SBFD operation from the base station. The UL subband and DL subband information include respective subband frequency resource allocation information. In addition, the UL subband and DL subband include time resource allocation information. At this time, the time resource allocation information may be subband pattern configuration information including information on a period, offset, and duration for configuring the UL subband and DL subband within the corresponding carrier. According to the subband frequency resource allocation information and the time resource allocation information, UL / DL subbands for the SBFD operation and SBFD symbols corresponding thereto are configured at regular intervals within the corresponding carrier.

[0169] For a terminal, one DL-UL BWP pair may be configured to support the SBFD operation among one or more DL-UL BWP pairs configured for the terminal. In the present disclosure, this is referred to as an SBFD-associated DL / UL BWP pair, but the technical spirit of the present disclosure is not limited by the name. The SBFD-associated DL / UL BWP pair has at least the same center frequency as the UL subband. The SBFD-associated DL / UL BWP pair configuration information may include an ID configuration information area for a DL / UL BWP pair configured as the SBFD-associated DL / UL BWP pair among one or more DL / UL BWP pairs configured for the terminal. In addition, the SBFD-associated DL / UL BWP pair configuration information may include slot format configuration information in an SBFD symbol to be applied by the terminal when the DL / UL BWP pair is activated. The slot format information is SBFD slot / symbol setting information to indicate whether the terminal will operate as a UL transmission symbol through a UL subband in an SBFD symbol, or as a DL reception symbol through a DL subband.

[0170] In this way, when one SBFD associated DL / UL BWP pair is configured among one or more DL / UL BWP pairs configured in any terminal, the terminal can determine the slot format, particularly, the slot format in the SBFD symbol, based on whether the activated DL / UL BWP pair is the SBFD associated DL / UL BWP pair. That is, when the DL / UL BWP pair activated by the base station is not the SBFD associated DL / UL BWP pair (in the present disclosure, this is referred to as a non-SBFD associated DL / UL BWP pair for convenience of description, but is not limited to this terminology), the terminal applies the existing legacy TDD configuration in all symbols, i.e., the 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated' configurations or the DL / UL and flexible symbol configuration / indication information by DCI format 2_0. That is, the slot format is determined based on the legacy TDD configuration information not only for non-SBFD symbols that do not include DL / UL subbands, but also for SBFD symbols that include DL / UL subbands, so that a reception operation for a downlink wireless channel and wireless signal is performed in a DL symbol or a flexible symbol, and a transmission operation for an uplink wireless channel and wireless signal is performed in a UL symbol or a flexible symbol.

[0171] However, if the DL symbol according to the legacy TDD configuration or the flexible symbol for which DL reception is set is set to an SBFD symbol including a UL / DL subband according to the SBFD subband setting, and the frequency resource of the non-SBFD associated DL BWP includes a portion of the UL subband or guard band, the terminal may exclude downlink reception through the frequency resource of the UL subband or guard band in the SBFD symbol. Similarly, if the UL symbol according to the legacy TDD configuration or the flexible symbol for which UL transmission is set or indicated is set to an SBFD symbol including a UL / DL subband according to the SBFD subband setting, and the frequency resource of the non-SBFD associated UL BWP includes a portion of the DL subband or guard band, the terminal may exclude uplink transmission through the frequency resource of the DL subband or guard band in the SBFD symbol.

[0172] However, excluding downlink reception and uplink transmission from the terminal may mean dropping the allocated wireless channel or the wireless signal transmission itself, or dropping only the transmission in the overlapping frequency resources (e.g., applying puncturing or rate matching).

[0173] On the other hand, if a DL / UL BWP pair activated by a base station is a DL / UL BWP pair configured as the SBFD associated DL / UL BWP pair, any terminal applies new slot format configuration information in an SBFD symbol, which is included in the SBFD associated DL / UL BWP pair configuration information or configured separately, to perform downlink reception and uplink transmission operations. That is, for non-SBFD symbols that do not include UL / DL subbands, the terminal performs a downlink reception operation through the SBFD associated DL BWP in a DL symbol or a flexible symbol according to the legacy TDD configuration, and performs an uplink transmission operation through the SBFD associated UL BWP in a UL symbol or a flexible symbol. On the other hand, for SBFD symbols, the terminal applies a slot format configuration newly configured for the SBFD symbol, not an existing legacy TDD configuration configuration. That is, in the SBFD symbol, if the new slot format setting information for the corresponding SBFD symbol is set to DL, the terminal performs a reception operation for the downlink wireless channel and wireless signal through the DL subband. On the other hand, if the new slot format setting information for the corresponding SBFD symbol is set to UL, the terminal performs a transmission operation for the uplink wireless channel and wireless signal through the UL subband.

[0174] In summary, a terminal can receive SBFD-associated DL / UL BWP pair information from one or more DL / UL BWP pairs configured from a base station. The SBFD-associated DL / UL BWP pair configuration information may include DL / UL BWP pair ID assignment information. Additionally, it may include slot format configuration information for SBFD symbols.

[0175] If the DL / UL BWP pair activated by the base station according to the SBFD associated DL / UL BWP pair configuration information is a non-SBFD associated DL / UL BWP pair, the terminal performs DL reception and UL transmission according to the legacy TDD configuration in all symbols including the non-SBFD symbol and the SBFD symbol.

[0176] On the other hand, if the DL / UL BWP pair activated by the base station is an SBFD associated DL / UL BWP pair according to the SBFD associated DL / UL BWP pair configuration information, the terminal performs DL reception and UL transmission operations according to the existing legacy TDD configuration in the non-SBFD symbol, and performs DL reception and UL transmission operations according to the newly configured slot format configuration information for the SBFD symbol in the SBFD symbol.

[0177] 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.

[0178]

[0179] 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.

[0180] Fig. 12 is a drawing showing the configuration of a terminal (1200) according to another embodiment.

[0181] 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.

[0182] The control unit (1210) controls the overall operation of the terminal (1200) according to the method of performing communication in the wireless mobile communication system required to perform the present invention described above.

[0183] The control unit (1210) may receive SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol. The control unit (1210) may operate in a TDD (Time Division Duplex) mode. TDD is a method of using time-interval radio resources by dividing them into downlink slots and uplink slots, and the terminal may receive TDD configuration information from a base station to determine the format of a symbol in a slot. In this case, the TDD configuration information may include configuration information regarding the format of a slot and configuration information for determining the format of a symbol in the slot, and the information may be received through upper layer signaling or physical layer (L1) signaling.

[0184] That is, downlink symbols, uplink symbols, and flexible symbols with an unspecified 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 control unit (1210) can receive terminal-specific RRC signaling for reallocating flexible symbols among the symbols set through cell-specific RRC signaling to uplink symbols, downlink symbols, or flexible symbols for each terminal.

[0185] Alternatively, the control unit (1210) may be instructed to specify a dynamic slot format via a UE-group common PDCCH. As an example, the control unit (1210) may be instructed to specify a dynamic slot format via DCI format 2_0.

[0186] 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 control unit (1210) 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.

[0187] The control unit (1210) can perform communication in full-duplex mode. Full-duplex communication is a technology in which a base station simultaneously performs downlink transmission and uplink reception on the same radio resources. The terminal side 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, and other frequency resources can be used for uplink reception. That is, within a TDD carrier, some frequency resources in any downlink symbol can be configured to be utilized for uplink transmission of a terminal, or to be utilized as flexible symbols for downlink / uplink transition.

[0188] To this end, the control unit (1210) may receive SBFD configuration information. That is, the terminal 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 on at least one uplink subband and at least one downlink 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. Alternatively, the SBFD configuration information may include information on a frequency domain in which a guard band is configured and information on a time domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0189] In addition, for configuring SBFD subbands, time resource information for uplink subbands can be set based on reference subcarrier spacing (SCS) information and pattern setting information. In this case, the time resource information can be set based on the reference subcarrier spacing (SCS) included in the TDD configuration information. That is, as described above, the reference subcarrier spacing (SCS) setting included in the TDD configuration information can be used as a reference SCS for setting time resources for configuring uplink subbands.

[0190] Additionally, time resource information can be set based on the number of TDD patterns and the period of the patterns included in the TDD configuration information. That is, as described above, the settings for Pattern 1 and Pattern 2 included in the TDD configuration information can be used as pattern setting information for setting time resources for configuring an uplink subband.

[0191] 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 cycle setting information, offset information, and duration information of the corresponding pattern. 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.

[0192] For configuring SBFD subbands, frequency resource configuration information for uplink subbands may be configured in units of common resource blocks (CRBs). In this case, frequency resource configuration for uplink subbands may be accompanied by guardband configuration or downlink subband configuration within the same symbol / slot. That is, frequency resource configuration information for uplink subbands may include at least one of guardbands accompanying an SBFD slot or SBFD symbol in which the uplink subband is configured, or frequency resource configuration information for downlink subbands. In this case, time resource configuration information for the guardband or downlink subbands may be configured according to the time resource configuration information of the uplink subband.

[0193] 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.

[0194] The control unit (1210) can receive SBFD-related bandwidth part (BWP) configuration information and perform communication with the base station according to a slot format determined based on the SBFD configuration information and the SBFD-related BWP configuration information. The control unit (1210) can receive one or more, and up to four, downlink / uplink (DL / UL) bandwidth part (BWP) pairs from the base station. Here, the DL / UL bandwidth part pairs can mean each DL BWP and UL BWP having the same BWP-ID and center frequency, respectively.

[0195] If the SBFD operation is not supported, the control unit (1210) receives the downlink through the DL BWP activated in the symbol set to downlink (DL) through the aforementioned 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated', which are Time Division Duplex (TDD) configuration information. Similarly, the control unit (1210) transmits the uplink through the UL BWP activated in the symbol set to uplink (UL) through the TDD configuration information. In addition, if the control unit (1210) additionally receives slot format indication information through DCI format 2_0 for a symbol set to flexible, the control unit (1210) can perform downlink reception through the DL BWP in the symbol indicated as DL, and can perform uplink transmission through the UL BWP in the symbol indicated as UL. Alternatively, for flexible symbols, DL reception via DL BWP and UL transmission via UL BWP may be indicated according to the scheduling DCI format.

[0196] In contrast, when the SBFD operation is supported, the control unit (1210) may receive SBFD-associated BWP configuration information. The SBFD-associated BWP configuration information may include information for configuring one of a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as the SBFD-associated BWP pair. That is, among one or more DL / UL BWP pairs configured for the terminal, one DL-UL BWP pair for supporting the SBFD operation may be configured as the SBFD-associated BWP pair. According to an example, the SBFD-associated BWP pair may be configured to have at least the same center frequency as an uplink subband (UL subband) configured according to the SBFD configuration information.

[0197] For example, the SBFD-associated BWP configuration information may include identification information for the SBFD-associated BWP pair and slot format configuration information in the SBFD symbol. That is, the SBFD-associated BWP configuration information may include an ID configuration information area for a DL / UL BWP pair configured as the SBFD-associated BWP pair among one or more DL / UL BWP pairs configured for the corresponding terminal.

[0198] In addition, the SBFD-associated BWP configuration information may include slot format configuration information in an SBFD symbol to be applied by the terminal when the corresponding SBFD-associated BWP pair is activated. The slot format information may include SBFD slot / symbol configuration information for indicating whether the terminal will perform uplink transmission using a UL subband or downlink reception using a DL subband in the SBFD symbol. In this way, when the SBFD-associated BWP pair is configured in the terminal, the control unit (1210) may determine the slot format, particularly, the slot format in the SBFD symbol, depending on whether the activated DL / UL BWP pair is an SBFD-associated BWP pair.

[0199] For example, if a pair of uplink BWP and downlink BWP activated for a terminal is an SBFD-associated BWP pair, the control unit (1210) can determine a slot format for the SBFD symbol based on slot format setting information in the SBFD symbol. That is, if an SBFD-associated BWP pair is activated from a base station, the control unit (1210) can perform downlink reception and uplink transmission operations by applying slot format setting information in the SBFD symbol included in the SBFD-associated BWP setting information.

[0200] That is, the control unit (1210) can perform a downlink reception operation through an SBFD-associated DL BWP in a DL symbol or a flexible symbol according to existing TDD configuration information for a non-SBFD symbol that does not include an UL / DL subband, and can perform an uplink transmission operation through an SBFD-associated UL BWP in a UL symbol or a flexible symbol. On the other hand, in the case of an SBFD symbol, slot format setting information newly set for the SBFD symbol can be applied, not a setting according to existing TDD configuration information. That is, when the SBFD symbol is set to DL by the slot format setting information in the SBFD symbol, the control unit (1210) can perform a reception operation for a downlink wireless channel and wireless signal through the DL subband. If the SBFD symbol is set to UL by the slot format setting information in the SBFD symbol, the control unit (1210) can perform a transmission operation for an uplink wireless channel and wireless signal through the UL subband.

[0201] The above description assumes that the SBFD-related BWP configuration information includes slot format configuration information in the SBFD symbol, but is not limited thereto. Alternatively, the slot format configuration information in the SBFD symbol may be transmitted to the terminal via separate upper layer signaling or L1 / L2 signaling. Even in this case, the above description may be substantially identically applied.

[0202] In another example, if the pair of uplink BWP and downlink BWP activated for the terminal is not an SBFD-associated BWP pair, the control unit (1210) may determine the slot format for the SBFD symbol according to the TDD configuration information. That is, if the DL / UL BWP pair activated by the base station is not an SBFD-associated BWP pair, the control unit (1210) may apply the existing TDD configuration information or the DL / UL and flexible symbol setting / indication information by DCI format 2_0 to all symbols.

[0203] In this case, the control unit (1210) can determine the slot format based on the TDD configuration information not only for non-SBFD symbols that do not include DL / UL subbands, but also for SBFD symbols that include DL / UL subbands. Accordingly, the control unit (1210) can perform a reception operation for a downlink wireless channel and wireless signal in a DL symbol or a flexible symbol, and can perform a transmission operation for an uplink wireless channel and wireless signal in a UL symbol or a flexible symbol.

[0204] However, in this case, according to an example, if a DL symbol according to TDD configuration information, or a flexible symbol for which DL reception is set / instructed, is set to an SBFD symbol including a UL / DL subband according to an SBFD subband setting, and the frequency resource of the corresponding non-SBFD associated DL BWP includes at least a portion of a UL subband or guard band, the control unit (1210) may exclude downlink reception through the frequency resource of the UL subband or guard band in the corresponding SBFD symbol. That is, if the symbol set to DL is an SBFD symbol, the control unit (1210) may be configured not to use the UL subband or guard band configured in the corresponding symbol when performing downlink reception.

[0205] Similarly, if a UL symbol according to TDD configuration information, or a flexible symbol for which UL transmission is set / instructed, is set to an SBFD symbol including UL / DL subbands according to SBFD subband settings, and the frequency resources of the corresponding non-SBFD associated UL BWP include at least some of the DL subbands or guard bands, the control unit (1210) may exclude uplink transmission through the frequency resources of the DL subbands or guard bands in the corresponding SBFD symbol. That is, if a symbol set to UL is an SBFD symbol, the control unit (1210) may be configured not to use the DL subbands or guard bands configured in the corresponding symbol when performing uplink transmission.

[0206] Here, excluding downlink reception and uplink transmission at the terminal may mean dropping the allocated radio channel or the radio signal transmission itself, or dropping only transmissions in overlapping frequency resources, for example, applying puncturing or rate matching.

[0207] Afterwards, the terminal can communicate with the base station by applying the determined slot format.

[0208] Accordingly, a method and device can be provided that can determine the format of a slot used to perform communication in an environment where full-duplex communication is applied.

[0209] Fig. 13 is a drawing showing the configuration of a base station (1300) according to another embodiment.

[0210] 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.

[0211] The control unit (1310) controls the overall operation of the base station (1300) according to the method of performing communication in the wireless mobile communication system required to perform the present invention described above. 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, messages, and the like from the terminal through the corresponding channel.

[0212] The control unit (1310) can transmit SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol. The control unit (1310) can operate in a TDD (Time Division Duplex) mode. TDD is a method of using time-interval radio resources by dividing them into downlink slots and uplink slots, and the control unit (1310) can transmit TDD configuration information to a terminal to determine the format of a symbol in a slot. In this case, the TDD configuration information can include configuration information regarding the format of a slot and configuration information for determining the format of a symbol in the slot, and the information can be transmitted through upper layer signaling or physical layer (L1) signaling.

[0213] That is, downlink symbols, uplink symbols, and flexible symbols with an unspecified 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 control unit (1310) can transmit terminal-specific RRC signaling to reallocate flexible symbols among the symbols set through cell-specific RRC signaling to uplink symbols, downlink symbols, or flexible symbols for each terminal.

[0214] Alternatively, the control unit (1310) may indicate a dynamic slot format via a UE-group common PDCCH. For example, the UE may be dynamically indicated a slot format via DCI format 2_0.

[0215] The control unit (1310) can perform communication in full-duplex mode. Full-duplex communication is a technology in which a base station simultaneously performs downlink transmission and uplink reception on the same radio resources. The terminal side 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, and other frequency resources can be used for uplink reception. That is, within a TDD carrier, some frequency resources in any downlink symbol can be configured to be utilized for uplink transmission of the terminal, or to be utilized as flexible symbols for downlink / uplink transition.

[0216] To this end, the control unit (1310) may transmit SBFD configuration information to the terminal. That is, the control unit (1310) may transmit information on the time domain and the 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 at least one uplink subband and at least one downlink 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. Alternatively, the SBFD configuration information may include information on a frequency domain in which a guard band is configured and information on a time domain. Here, the frequency resource information may include resource block allocation information, and the time resource information may include SBFD symbol allocation information.

[0217] 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.

[0218] The control unit (1310) can transmit SBFD-related bandwidth part (BWP) configuration information and perform communication with the terminal according to a slot format determined based on the SBFD configuration information and the SBFD-related BWP configuration information. The control unit (1310) can set one or more, and up to four downlink / uplink (DL / UL) bandwidth part (BWP) pairs for the terminal. Here, the DL / UL bandwidth part pairs can mean each DL BWP and UL BWP having the same BWP-ID and center frequency, respectively.

[0219] If the SBFD operation is not supported, the control unit (1310) transmits the downlink through the DL BWP activated in the symbol set to downlink (DL) through the aforementioned 'tdd-UL-DL-ConfigurationCommon' and 'tdd-UL-DL-ConfigurationDedicated', which are Time Division Duplex (TDD) configuration information. Similarly, the control unit (1310) transmits the uplink through the UL BWP activated in the symbol set to uplink (UL) through the TDD configuration information. In addition, if the control unit (1310) additionally transmits slot format indication information through DCI format 2_0 for a symbol set to flexible, the control unit (1310) can perform downlink transmission through the DL BWP in the symbol indicated as DL, and can perform uplink reception through the UL BWP in the symbol indicated as UL. Alternatively, for a flexible symbol, the control unit (1310) can instruct the terminal to receive DL through DL BWP and transmit UL through UL BWP through scheduling DCI format.

[0220] In contrast, when the SBFD operation is supported, the control unit (1310) may transmit SBFD-related BWP configuration information to the terminal. The SBFD-related BWP configuration information may include information for setting one of a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as the SBFD-related BWP pair. That is, among one or more DL / UL BWP pairs configured for the terminal, one DL-UL BWP pair for supporting the SBFD operation may be set as the SBFD-related BWP pair. According to an example, the SBFD-related BWP pair may be configured to have at least the same center frequency as an uplink subband (UL subband) configured according to the SBFD configuration information.

[0221] For example, the SBFD-associated BWP configuration information may include identification information for the SBFD-associated BWP pair and slot format configuration information in the SBFD symbol. That is, the SBFD-associated BWP configuration information may include an ID configuration information area for a DL / UL BWP pair configured as the SBFD-associated BWP pair among one or more DL / UL BWP pairs configured for the corresponding terminal.

[0222] In addition, the SBFD-associated BWP configuration information may include slot format configuration information in an SBFD symbol to be applied by the terminal when the corresponding SBFD-associated BWP pair is activated. The slot format information may include SBFD slot / symbol configuration information for indicating to the control unit (1310) whether to perform uplink reception using a UL subband or downlink transmission using a DL subband in the SBFD symbol. In this way, when the SBFD-associated BWP pair is configured in the terminal, the control unit (1310) may determine a slot format, particularly, a slot format in an SBFD symbol, depending on whether the activated DL / UL BWP pair is an SBFD-associated BWP pair.

[0223] For example, if a pair of uplink BWP and downlink BWP activated for a terminal is an SBFD-associated BWP pair, the control unit (1310) can determine a slot format for the SBFD symbol based on slot format setting information in the SBFD symbol. That is, if an SBFD-associated BWP pair is activated for the terminal, the control unit (1310) can perform downlink transmission and uplink reception operations by applying slot format setting information in the SBFD symbol included in the SBFD-associated BWP setting information.

[0224] That is, the control unit (1310) can perform a downlink transmission operation through an SBFD-associated DL BWP in a DL symbol or a flexible symbol according to existing TDD configuration information for a non-SBFD symbol that does not include a UL / DL subband, and can perform an uplink reception operation through an SBFD-associated UL BWP in a UL symbol or a flexible symbol. On the other hand, in the case of an SBFD symbol, slot format setting information newly set for the SBFD symbol can be applied, not a setting according to existing TDD configuration information. That is, when the SBFD symbol is set to DL by the slot format setting information in the SBFD symbol, the control unit (1310) can perform a transmission operation for a downlink wireless channel and wireless signal through the DL subband. If the SBFD symbol is set to UL by the slot format setting information in the SBFD symbol, the control unit (1310) can perform a reception operation for an uplink wireless channel and wireless signal through the UL subband.

[0225] In the above, it is assumed that the SBFD-related BWP configuration information includes slot format configuration information in the SBFD symbol, but this is not limited to this. According to another example, the control unit (1310) may transmit slot format configuration information in the SBFD symbol to the terminal through separate upper layer signaling or L1 / L2 signaling. Even in this case, the above description can be applied substantially in the same way.

[0226] In another example, if the pair of uplink BWP and downlink BWP activated for the terminal is not an SBFD-associated BWP pair, the control unit (1310) may determine the slot format for the BFD symbol according to the TDD configuration information. That is, if the DL / UL BWP pair activated for the terminal is not an SBFD-associated BWP pair, the control unit (1310) may transmit to the terminal the existing TDD configuration information or the DL / UL and flexible symbol setting / indication information according to DCI format 2_0 in all symbols.

[0227] In this case, the control unit (1310) can determine the slot format based on the TDD configuration information not only for non-SBFD symbols that do not include DL / UL subbands, but also for SBFD symbols that include DL / UL subbands. Accordingly, the base station can perform a transmission operation for a downlink wireless channel and wireless signal in a DL symbol or a flexible symbol, and perform a reception operation for an uplink wireless channel and wireless signal in a UL symbol or a flexible symbol.

[0228] However, in this case, for example, if a DL symbol according to TDD configuration information for a terminal, or a flexible symbol for which DL reception is set / instructed, is set to an SBFD symbol including a UL / DL subband according to an SBFD subband setting, and the frequency resources of the corresponding non-SBFD associated DL BWP include at least a portion of a UL subband or guard band, the terminal may exclude downlink reception through the frequency resources of the UL subband or guard band in the corresponding SBFD symbol. That is, if a symbol set to DL is an SBFD symbol, the terminal may be configured not to use the UL subband or guard band configured in the corresponding symbol when performing downlink reception.

[0229] Similarly, if a UL symbol according to TDD configuration information, or a flexible symbol for which UL transmission is set / instructed, is set to an SBFD symbol including UL / DL subbands according to SBFD subband settings, and the frequency resources of the corresponding non-SBFD associated UL BWP include at least some of the DL subbands or guard bands, the terminal may exclude uplink transmission through the frequency resources of the DL subbands or guard bands in the corresponding SBFD symbol. That is, if a symbol set to UL is an SBFD symbol, the terminal may be configured not to use the DL subbands or guard bands configured in the corresponding symbol when performing uplink reception.

[0230] Here, excluding downlink reception and uplink transmission at the terminal may mean dropping the allocated radio channel or the radio signal transmission itself, or dropping only transmissions in overlapping frequency resources, for example, applying puncturing or rate matching.

[0231] Afterwards, the control unit (1310) can perform communication with the terminal by applying the determined slot format.

[0232] Accordingly, a method and device can be provided that can determine the format of a slot used to perform communication in an environment where full-duplex communication is applied.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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.

[0239]

[0240] CROSS-REFERENCE TO RELATED APPLICATION

[0241] This patent application claims priority under 35 USC §119(a) to Korean Patent Application No. 10-2024-0023678, filed in Korea on February 19, 2024, and Korean Patent Application No. 10-2025-0021045, filed in Korea on February 18, 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 the method by which the terminal performs communication, A step of receiving SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband full duplex (SBFD) symbol; A step of receiving SBFD-related bandwidth part (BWP) setting information; and A method comprising the step of performing communication with a base station according to a slot format determined based on the above SBFD configuration information and the above SBFD-related BWP setting information.

2. In paragraph 1, The above SBFD related BWP setting information is: A method including information for setting one pair among a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as an SBFD-associated BWP pair.

3. In paragraph 2, The above SBFD related BWP setting information is: A method including identification information for the above SBFD associated BWP pair and slot format setting information in the above SBFD symbol.

4. In paragraph 3, The steps for performing the above communication are: A method for determining a slot format for the SBFD symbol based on slot format setting information in the SBFD symbol, when a pair of uplink BWP and downlink BWP activated for the terminal is the SBFD-related BWP pair.

5. In paragraph 2, The steps for performing the above communication are: A method for determining a slot format according to time division duplex (TDD) configuration information for the SBFD symbol, when the pair of uplink BWP and downlink BWP activated for the terminal is not the SBFD-related BWP pair.

6. In the method by which the base station performs communication, A step of transmitting SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband full duplex (SBFD) symbol; A step of transmitting SBFD-related bandwidth part (BWP) setting information; and A method comprising a step of performing communication with a terminal according to a slot format determined based on the above SBFD configuration information and the above SBFD-related BWP setting information.

7. In paragraph 6, The above SBFD related BWP setting information is: A method including information for setting one pair among a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as an SBFD-associated BWP pair.

8. In paragraph 7, The above SBFD related BWP setting information is: A method including identification information for the above SBFD associated BWP pair and slot format setting information in the above SBFD symbol.

9. In paragraph 8, The steps for performing the above communication are: A method for determining a slot format for the SBFD symbol based on slot format setting information in the SBFD symbol, when a pair of uplink BWP and downlink BWP activated for the terminal is the SBFD-related BWP pair.

10. In paragraph 7, The steps for performing the above communication are: A method for determining a slot format according to time division duplex (TDD) configuration information for the SBFD symbol, when the pair of uplink BWP and downlink BWP activated for the terminal is not the SBFD-related BWP pair.

11. In the terminal performing communication, Transmitter; Receiver; and Including a control unit that controls the operation of the above transmitter and receiver, The control unit is a terminal that receives SBFD configuration information including configuration information for at least one uplink subband and at least one downlink subband and configuration information for a subband-based full duplex (SBFD) symbol, receives SBFD-related bandwidth part (BWP) configuration information, and performs communication with a base station according to a slot format determined based on the SBFD configuration information and the SBFD-related BWP configuration information.

12. In paragraph 11, The above SBFD related BWP setting information is: A terminal including information for setting one pair among a plurality of pairs of uplink BWPs and downlink BWPs configured for the terminal as an SBFD-associated BWP pair.

13. In paragraph 12, The above SBFD related BWP setting information is: A terminal including identification information for the above SBFD-associated BWP pair and slot format setting information in the above SBFD symbol.

14. In paragraph 13, The above control unit, A terminal that determines a slot format for the SBFD symbol based on slot format setting information in the SBFD symbol, when a pair of uplink BWP and downlink BWP activated for the terminal is the SBFD-related BWP pair.

15. In paragraph 12, The above control unit, A terminal that determines a slot format according to time division duplex (TDD) configuration information for the SBFD symbol, when the pair of uplink BWP and downlink BWP activated for the terminal is not the SBFD-related BWP pair.

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