Method and apparatus for transmitting and receiving data in mobile communication system supporting sub-band-based full duplex communication

Abstract

Provided are a method and an apparatus for transmitting and receiving uplink data and downlink data, and provided are a method and an apparatus for processing a data transmission and reception operation when a symbol in which sub-band-based full duplex communication is configured and a legacy symbol are consecutive.

Description

Method and device for transmitting and receiving data in a subband-based full-duplex communication-supporting mobile communication system

[0001] The present disclosure provides a method and device for uplink transmission and downlink reception for full-duplex communication.

[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 has recently attracted attention as a technology to address these issues.

[0003] In a Full Duplex environment, especially when Full Duplex is configured in symbol or slot units based on subbands, problems may arise due to changes in the configuration of symbols or slots during data transmission and reception operations in conventional TDD operations.

[0004] In particular, in cases where the duplex type is configured in various ways by symbol or slot unit, a technology is needed to accurately process downlink data reception or uplink data transmission according to the duplex type change.

[0005] The present disclosure seeks to provide uplink transmission and downlink reception technology for full-duplex communication.

[0006] In one aspect, the present embodiments provide a method for a terminal to transmit and receive data in a mobile communication system supporting sub-band full duplex (SBFD), the method including: receiving control information for uplink data transmission or downlink data reception; and controlling an operation of transmitting and receiving uplink data or downlink data through two consecutive symbols set to different symbol types, wherein the two consecutive symbols set to different symbol types are a first type symbol for which sub-band full duplex (SBFD) communication is set and a second type symbol for which sub-band full duplex communication is not set, and a guard time is included between the first type symbol and the second type symbol.

[0007] In another aspect, the present embodiments provide a method for a base station to control data transmission and reception of a terminal in a mobile communication system supporting sub-band full duplex (SBFD), the method including the steps of transmitting control information for uplink data transmission or downlink data reception of the terminal to the terminal and the step of controlling an operation of transmitting and receiving uplink data or downlink data through two consecutive symbols set to different symbol types, wherein the two consecutive symbols set to different symbol types are a first type symbol in which sub-band full duplex (SBFD) communication is set and a second type symbol in which sub-band full duplex communication is not set, and a guard time is included between the first type symbol and the second type symbol.

[0008] In another aspect, the present embodiments provide a terminal for transmitting and receiving data in a mobile communication system supporting sub-band full duplex (SBFD), the terminal including a receiving unit for receiving control information for uplink data transmission or downlink data reception, and a control unit for controlling an operation of transmitting and receiving uplink data or downlink data through two consecutive symbols set to different symbol types, wherein the two consecutive symbols set to different symbol types are a first type symbol for which sub-band full duplex (SBFD) communication is set and a second type symbol for which sub-band full duplex communication is not set, and a guard time is included between the first type symbol and the second type symbol.

[0009] In another aspect, the present embodiments provide a base station for controlling data transmission and reception of a terminal in a mobile communication system supporting sub-band full duplex (SBFD), the base station including a transmitter for transmitting control information for uplink data transmission or downlink data reception of the terminal to the terminal, and a controller for controlling transmission and reception of uplink data or downlink data through two consecutive symbols set to different symbol types, wherein the two consecutive symbols set to different symbol types are a first type symbol for which sub-band full duplex (SBFD) communication is set and a second type symbol for which sub-band full duplex communication is not set, and a guard time is included between the first type symbol and the second type symbol.

[0010] The present disclosure has the effect of providing uplink transmission and downlink reception technology for full-duplex communication.

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

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

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

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

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

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

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

[0018] FIG. 8 is a diagram for explaining an example of a UL subband setting in an arbitrary DL slot to which the present embodiment can be applied.

[0019] FIG. 9 is a diagram for explaining an example in which a UL subband is set differently in any DL slot to which the present embodiment can be applied.

[0020] Fig. 10 is a drawing for explaining terminal operation according to one embodiment.

[0021] Fig. 11 is a diagram for explaining base station operation according to one embodiment.

[0022] Fig. 12 is a drawing showing the configuration of a terminal according to another embodiment.

[0023] Fig. 13 is a drawing showing the configuration of a base station according to another embodiment.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.).

[0029] 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.

[0030] The embodiments disclosed below can be applied to wireless communication systems using various wireless access technologies. For example, the embodiments can be applied to various wireless access technologies such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), or NOMA (non-orthogonal multiple access). In addition, the wireless access technology may not only refer to a specific access technology, but also to each generation of communication technologies established by various communication agreement organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA can be implemented with wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (global system for mobile communications) / GPRS (general packet radio service) / EDGE (enhanced data rates for GSM evolution). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTSterrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink. Thus, the present embodiments can be applied to currently disclosed or commercialized wireless access technologies, as well as wireless access technologies currently under development or to be developed in the future.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.'

[0037] 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.

[0038] 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 is an enhancement of LTE-Advanced technology to meet the requirements of the ITU-R, as a 5G communication technology, 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 center, unless a specific communication technology is specified.

[0039] The operating scenario in NR defines various operation scenarios by adding considerations for satellites, automobiles, and new verticals to the existing 4G LTE scenario, and in terms of service, it supports the eMBB (Enhanced Mobile Broadband) scenario, the mMTC (Massive Machine Communication) scenario that has high terminal density but is deployed over a wide area and requires low data rate and asynchronous access, and the URLLC (Ultra Reliability and Low Latency) scenario that requires high responsiveness and reliability and can support high-speed mobility.

[0040] 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.

[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 using the μ value as an exponent value of 2 based on 15 kHz, as shown in Table 1 below.

[0049] μsubcarrier intervalCyclic 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 15 kHz subcarrier spacing of LTE, one of the 4G communication technologies. 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, 120, 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 of the same length of 1 ms. One frame can be divided into 5 ms half frames, 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.

[0051] 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 in length, 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. In other words, subframes and frames are defined with fixed time lengths, while slots are defined by the number of symbols, and their time lengths may vary depending on the subcarrier spacing.

[0052] 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.

[0053] Furthermore, unlike LTE, NR defines uplink and downlink resource allocation at the symbol level within a single slot. To reduce HARQ delay, a slot structure was defined that allows HARQ ACK / NACKs to be transmitted directly within the transmission slot. This slot structure is referred to as a self-contained structure and will be described in detail.

[0054] 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.

[0055] <NR 물리 자원 >

[0056] In relation to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, and bandwidth parts are considered.

[0057] 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 (QC / QCL) 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.

[0058] FIG. 3 is a diagram for explaining a resource grid supported by a wireless access technology to which the present embodiment can be applied.

[0059] 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.

[0060] 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.

[0061] FIG. 4 is a diagram for explaining a bandwidth part supported by a wireless access technology to which the present embodiment can be applied.

[0062] 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.

[0063] 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.

[0064] <NR 초기 접속>

[0065] In NR, a terminal performs cell search and random access procedures to connect to a base station and perform communication.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] The terminal receives SSB by monitoring SSB in the time and frequency domain.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] FIG. 6 is a diagram for explaining a random access procedure in a wireless access technology to which the present embodiment can be applied.

[0076] 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.

[0077] The terminal 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 terminals, the random access preamble identifier may be included to indicate which terminal 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 terminal 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).

[0078] 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.

[0079] Finally, the terminal receives a downlink message for contention resolution.

[0080] <NR CORESET>

[0081] 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.

[0082] 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.

[0083] Figure 7 is a drawing for explaining CORESET.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] The present disclosure proposes a technology for transmitting and receiving uplink and downlink data between a base station and a terminal to support full-duplex communication. For example, the present disclosure proposes a method and device that ensures smooth data transmission and reception according to symbol type changes when symbols that support subband-based full-duplex communication and those that do not are consecutive.

[0088] 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 has recently attracted attention as a technology to address these issues.

[0089] Full duplex is a technology that simultaneously performs transmission and reception using the same time and frequency resources. Generally, simultaneous DL transmission and UL reception are being considered from the base station (gNB in ​​the case of 5G). However, this is not limited to this, and simultaneous DL reception and UL transmission can also be performed from 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 prone to self-interference cancellation, the DL reception performance of the terminal is easily affected by self-interference of the UL transmission signal. Therefore, the case where the base station operates in full duplex and the terminal operates in half duplex is generally considered. Additionally, from the base station's perspective, to reduce the impact of self-interference, a subband non-overlapping full duplex method can be primarily considered, which performs DL transmission and UL reception simultaneously while distinguishing the frequency resources for DL ​​and UL transmission and reception.

[0090] FIG. 8 is a diagram for explaining an example of a UL subband setting in an arbitrary DL slot to which the present embodiment can be applied.

[0091] FIG. 9 is a diagram for explaining an example in which a UL subband is set differently in any DL slot to which the present embodiment can be applied.

[0092] Referring to FIGS. 8 and 9, a TDD configuration can be achieved in which DL slots and UL slots are arranged in a ratio of 4:1 in any NR frequency band (however, some symbols of the last DL slot are special slots containing flexible symbols for DL / UL transition). In this case, a UL subband can be set to support UL transmission of a terminal in some (or all) of the DL slots.

[0093] For example, when a UL subband is configured for a random DL slot, the UL subband may be configured at the center of the corresponding frequency band, as shown in FIG. 8. Alternatively, the UL subband may be configured at the edge of the corresponding frequency band, as shown in FIG. 9. A guard band may be configured between the UL subband and the DL subband in the corresponding slot. Additionally, frequency resources other than the UL subband and the guard band may be utilized as DL subbands for DL ​​transmission and reception based on existing slot / symbol configuration information.

[0094] That is, when the UL subband is set around the center of the frequency band as in Fig. 8, two guard bands are configured, one each above and below the UL subband. Similarly, two DL subbands can be configured, one each above and below the UL subband. Alternatively, when the UL subband is set around the edge of the frequency band as in Fig. 9, one guard band and one DL subband can be configured following the UL subband.

[0095] The UL-DL slot configuration defined in NR is defined to be performed on a cell-by-cell basis through cell-specific RRC signaling. That is, the 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, only the flexible symbols set through the above 'tdd-UL-DL-ConfigurationCommon' can be reallocated to UL symbols, DL symbols, or flexible symbols for each UE through the UE-specific RRC signaling 'tdd-UL-DL-ConfigurationDedicated'. Alternatively, a method for indicating a dynamic slot format through the UE-group common PDCCH is also defined. For this purpose, NR also supports a method for indicating a dynamic slot format through DCI format 2_0.

[0096] According to the existing slot configuration method described above, any one symbol can be set or indicated as one of DL, UL, or Flexible. That is, FIGS. 8 and 9 are examples in which an arbitrary slot format is set to DDDSU through the existing slot configuration. D refers to a downlink slot, meaning that all OFDM symbols constituting the slot are set to DL. U refers to an uplink slot, meaning that all OFDM symbols constituting the slot are set to UL. S refers to a special slot, meaning a slot that includes a flexible symbol for DL / UL transition. Typically, in the case of a normal CP, the special slot can be configured with 12 DL symbols and 2 flexible symbols out of a total of 14 symbols. Alternatively, it can be configured with 10 DL symbols, 2 flexible symbols, and 2 UL symbols. That is, within any one TDD carrier, one symbol is configured or indicated as only one of DL, UL, or flexible.

[0097] However, if a UL subband is configured in any DL slot, DL transmission or UL transmission may occur simultaneously for each frequency resource in the symbol. In this specification, 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 (Subband Full Duplex) symbol. However, this is for convenience of explanation and is not limited to the term.

[0098] In addition, in this specification, 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.

[0099] Fig. 10 is a drawing for explaining terminal operation according to one embodiment.

[0100] Referring to FIG. 10, a method (S1000) for a terminal to transmit and receive data in a mobile communication system supporting sub-band-based full duplex (SBFD) communication may include a step of receiving control information for uplink data transmission or downlink data reception (S1010).

[0101] For example, a terminal may receive scheduling information, including radio resources for uplink data transmission, from a base station in order to transmit uplink data. Similarly, a terminal may receive scheduling information for a downlink data channel in order to receive downlink data.

[0102] Additionally, uplink data transmission or downlink data reception includes not only data transmission but also transmission resources for reference signals. Accordingly, the terminal can receive scheduling information including radio resources for uplink reference signal transmission or downlink reference signal reception.

[0103] The aforementioned control information may be received by at least one of downlink control information, upper layer signaling, MAC CE, and system information. Alternatively, the control information may be received by the terminal according to a combination of two or more signals, such as upper layer signaling (RRC configuration information) and MAC CE or DCI.

[0104] Meanwhile, the terminal may be set to a duplex mode of FDD or TDD, and in the case of TDD duplex mode, may receive configuration information for configuring TDD symbols or slots. Additionally, configuration information for configuring subband-based full-duplex communication may be received.

[0105] A method (S1000) for a terminal to transmit and receive data in a mobile communication system supporting sub-band full duplex (SBFD) communication may include a step of controlling transmission and reception operations of uplink data or downlink data through two consecutive symbols set to different symbol types (S1020).

[0106] For example, two consecutive symbols set to different symbol types are a first type symbol set to subband full duplex (SBFD) and a second type symbol set to not be subband full duplex, and a guard time may be included between the first type symbol and the second type symbol.

[0107] In FDD duplex mode, uplink and downlink are distinguished according to the frequency band. In this case, a guard band can be set to prevent interference between uplink and downlink. In TDD duplex mode, flexible symbols or slots can be set to switch between uplink symbols or slots and downlink symbols or slots to obtain time according to interference occurrence and switching. However, when changing from an uplink symbol or slot to a downlink symbol or slot, flexible symbol or slot setting may not be necessary depending on the TA (Timing Advance) value and the downlink transmission propagation delay at the base station.

[0108] However, in the case where subband full-duplex communication is established as in the present disclosure, each symbol can be divided into a first type symbol and a second type symbol. The terminal can schedule downlink data reception or uplink data transmission for two or more consecutive symbols according to control information. In this case, the terminal can monitor the radio resources of two or more consecutive scheduled symbols to receive downlink data or transmit uplink data.

[0109] If subband full-duplex communication is supported, Type 1 and Type 2 symbols may be configured consecutively. In this case, depending on the TDD configuration, the terminal may be configured to receive downlink data in both Type 1 and Type 2 symbols. Alternatively, the terminal may be configured to transmit uplink data in both Type 1 and Type 2 symbols.

[0110] When the symbol types of consecutive symbols change, interference or problems may occur in the transmitted and received data due to changes in the antenna settings of the base station, changes in the surrounding interference environment, etc. Therefore, when two consecutive symbols have different symbol types, such as a first type symbol and a second type symbol, a guard time may be included between the first type symbol and the second type symbol.

[0111] Guard times can be defined and set by a preset number of symbols. For example, guard times can be transmitted to terminals through control information or configuration information, allowing both terminals and base stations to recognize them.

[0112] When controlling downlink data or uplink data transmission and reception operations, the terminal may apply guard time when symbols of different symbol types are consecutive.

[0113] For example, downlink data may be configured to be punctured or rate-matched in symbols corresponding to guard times. During guard times, the base station may puncture radio resources to prevent downlink data transmission. Alternatively, rate matching may be configured to be applied during guard times. Such puncturing, etc., may be communicated to the terminal through downlink data scheduling via control information. Alternatively, the terminal and base station may be aware of downlink data puncturing, etc., during guard times through prior configuration.

[0114] As another example, when downlink data is a reference signal, channel measurement operation may be performed excluding reference signal instances in symbols corresponding to the guard time, or PDCCH monitoring operation may be stopped in symbols corresponding to the guard time. For example, when CSI-RS, etc. are transmitted, the terminal may not measure the CSI-RS in symbols corresponding to the guard time, or may exclude the measurement value for the corresponding CSI-RS when reporting the measurement. Alternatively, the terminal does not assume transmission of the PDCCH in symbols set as guard times. Accordingly, the terminal does not perform the PDCCH monitoring operation in the corresponding symbols.

[0115] As another example, uplink data may be configured to be punctured, rate-matched, and dropped in symbols corresponding to guard times. For example, when a terminal transmits uplink data according to scheduling information, the uplink data may be punctured in symbols corresponding to guard times. Alternatively, the terminal may apply rate matching in the corresponding symbol. Alternatively, the terminal may drop uplink data transmission in symbols corresponding to guard times. Puncturing refers to transmitting uplink data without using radio resources in the corresponding symbol, and dropping refers to not transmitting some of the uplink data allocated to the corresponding symbol and transmitting the remainder if it is scheduled to be transmitted in the corresponding symbol.

[0116] As another example, a terminal may drop a PUCCH transmission or a reference signal transmission if a PUCCH transmission or a reference signal transmission is indicated in a symbol corresponding to the guard time. For example, the reference signal may be an SRS.

[0117] Meanwhile, the PDSCH / PUSCH / PUCCH that is subject to puncturing, rate matching, or dropping in the PDSCH / PUSCH / PUCCH transmission in the symbol corresponding to the guard time refers to the nominal PDSCH / PUSCH / PUCCH.

[0118] In this way, when downlink or uplink data transmission and reception is performed via consecutive symbols, a guard time can be set to ensure normal data communication when the symbol types of consecutive symbols are different. Furthermore, the terminal and base station can mutually recognize the operation in the symbol corresponding to the guard time, thereby ensuring uninterrupted data communication.

[0119] Fig. 11 is a diagram for explaining base station operation according to one embodiment.

[0120] Referring to FIG. 11, a method (S1100) for a base station to control data transmission and reception of a terminal in a mobile communication system supporting sub-band-based full duplex (SBFD) communication may include a step of transmitting control information for uplink data transmission or downlink data reception of the terminal to the terminal (S1110).

[0121] For example, a base station may transmit scheduling information, including radio resources for uplink data transmission, to a terminal for transmitting uplink data. Similarly, a base station may transmit scheduling information for a downlink data channel to a terminal for transmitting downlink data.

[0122] Additionally, uplink data transmission or downlink data reception includes not only data transmission but also transmission resources for reference signals. Accordingly, the base station can transmit scheduling information including radio resources for uplink reference signal reception or downlink reference signal transmission.

[0123] The aforementioned control information may be transmitted by at least one of downlink control information, upper layer signaling, MAC CE, and system information. Alternatively, the control information may be transmitted to the terminal by a combination of two or more signals, such as upper layer signaling (RRC configuration information) and MAC CE or DCI.

[0124] Meanwhile, the terminal may be set to a duplex mode of FDD or TDD, and in the case of TDD duplex mode, may receive configuration information for configuring TDD symbols or slots. Additionally, configuration information for configuring subband-based full-duplex communication may be received.

[0125] A method (S1100) for a base station to control data transmission and reception of a terminal in a mobile communication system supporting sub-band full duplex (SBFD) communication may include a step of controlling transmission and reception operations of uplink data or downlink data through two consecutive symbols set to different symbol types (S1120).

[0126] For example, two consecutive symbols set to different symbol types are a first type symbol set to subband full duplex (SBFD) and a second type symbol set to not be subband full duplex, and a guard time may be included between the first type symbol and the second type symbol.

[0127] In FDD duplex mode, uplink and downlink are distinguished according to the frequency band. In this case, a guard band can be set to prevent interference between uplink and downlink. In TDD duplex mode, flexible symbols or slots can be set to switch between uplink symbols or slots and downlink symbols or slots to obtain time according to interference occurrence and switching. However, when changing from an uplink symbol or slot to a downlink symbol or slot, flexible symbol or slot setting may not be necessary depending on the TA (Timing Advance) value and the downlink transmission propagation delay at the base station.

[0128] However, in the case where subband full-duplex communication is established as in the present disclosure, each symbol can be divided into a first type symbol and a second type symbol. The base station can schedule downlink data reception or uplink data transmission to the terminal for two or more consecutive symbols using control information. In this case, the terminal can monitor the radio resources of two or more consecutive scheduled symbols to receive downlink data or transmit uplink data.

[0129] If subband full-duplex communication is supported, Type 1 and Type 2 symbols may be configured consecutively. In this case, depending on the TDD configuration, the terminal may be configured to receive downlink data in both Type 1 and Type 2 symbols. Alternatively, the terminal may be configured to transmit uplink data in both Type 1 and Type 2 symbols.

[0130] When the symbol types of consecutive symbols change, interference or problems may occur in the transmitted and received data due to changes in the antenna settings of the base station, changes in the surrounding interference environment, etc. Therefore, when two consecutive symbols have different symbol types, such as a first type symbol and a second type symbol, a guard time may be included between the first type symbol and the second type symbol.

[0131] Guard times can be defined and set by a preset number of symbols. For example, guard times can be transmitted to terminals through control information or configuration information, allowing both terminals and base stations to recognize them.

[0132] When controlling downlink data or uplink data transmission and reception operations, the terminal may apply guard time when symbols of different symbol types are consecutive.

[0133] For example, downlink data may be configured to be punctured or rate-matched in symbols corresponding to guard times. During the guard time, the base station may puncture radio resources to prevent downlink data transmission. Alternatively, rate-matching may be configured to be applied during the guard time. Such puncturing, etc., may be communicated to the terminal through downlink data scheduling via control information. Alternatively, the terminal and base station may be aware of downlink data puncturing, etc., during the guard time through prior configuration.

[0134] As another example, when downlink data is a reference signal, the terminal may perform a channel measurement operation excluding reference signal instances in symbols corresponding to the guard time, or may suspend the PDCCH monitoring operation in symbols corresponding to the guard time. For example, when CSI-RS, etc. are transmitted, the terminal may not measure the CSI-RS in symbols corresponding to the guard time, or may exclude the measurement value for the corresponding CSI-RS when reporting the measurement. Alternatively, the base station may not transmit the PDCCH in symbols set as guard times. Accordingly, the terminal does not perform the PDCCH monitoring operation in the corresponding symbols.

[0135] As another example, uplink data may be configured to be punctured, rate-matched, and dropped in symbols corresponding to guard times. For example, when a terminal transmits uplink data according to scheduling information, the uplink data may be punctured in symbols corresponding to guard times. Alternatively, the terminal may apply rate matching in the corresponding symbol. Alternatively, the terminal may drop uplink data transmission in symbols corresponding to guard times. Puncturing refers to transmitting uplink data without using radio resources in the corresponding symbol, and dropping refers to not transmitting some of the uplink data allocated to the corresponding symbol and transmitting the remainder if it is scheduled to be transmitted in the corresponding symbol.

[0136] As another example, a terminal may drop a PUCCH transmission or a reference signal transmission if a PUCCH transmission or a reference signal transmission is indicated in a symbol corresponding to the guard time. For example, the reference signal may be an SRS.

[0137] Meanwhile, the PDSCH / PUSCH / PUCCH that is subject to puncturing, rate matching, or dropping in the PDSCH / PUSCH / PUCCH transmission in the symbol corresponding to the guard time refers to the nominal PDSCH / PUSCH / PUCCH.

[0138] In this way, when downlink or uplink data transmission and reception is performed via consecutive symbols, a guard time can be set to ensure normal data communication when the symbol types of consecutive symbols are different. Furthermore, the terminal and base station can mutually recognize the operation in the symbol corresponding to the guard time, thereby ensuring uninterrupted data communication.

[0139] Below, more specific embodiments of the operations of the aforementioned terminal and base station are described. In the following, SBFD symbols denote Type 1 symbols, and non-SBFD symbols denote Type 2 symbols. Furthermore, for convenience of explanation, the description is primarily based on symbols, but the same principle can be applied to slots. For example, SBFD symbols can be replaced with SBFD slots and applied. Similarly, non-SBFD symbols can be replaced with non-SBFD slots and applied.

[0140] Each of the detailed embodiments described below can be performed by the terminal and base station described above through any combination.

[0141] To support TDD operation of existing terminals, a certain amount of guard time is required when switching between uplink transmission and downlink reception of the terminal. Specifically, when switching from downlink reception to uplink transmission, i.e., from DL symbols to UL symbols, a certain number of symbols can be set as flexible symbols to secure the guard time. Conversely, when switching from uplink transmission to downlink reception, guard time can be secured at the terminal without a separate flexible symbol configuration, depending on the TA (Timing Advance) value for uplink transmission and the downlink transmission propagation delay at the base station.

[0142] However, if UL / DL subband settings and corresponding SBFD symbol / slot settings are made to support SBFD as described above at any base station, and if there is a change in symbol type between continuous uplink transmission or downlink reception of the terminal, i.e., a change between non-SBFD symbols and SBFD symbols, a guard time for changing the uplink transmission settings or downlink reception settings of the terminal may be required depending on changes in the antenna settings of the base station, changes in the surrounding interference environment, etc.

[0143] In this disclosure, a method is proposed to set and support a guard time according to a symbol type change between uplink transmissions of a terminal or a symbol type change between downlink receptions.

[0144] For downlink

[0145] When a terminal receives a downlink, a DL reception symbol of a non-SBFD symbol and a DL reception symbol of an SBFD symbol may be consecutive. In this case, the terminal may set a certain number of symbols before or after the boundary where the symbol type change occurs as a guard time during which downlink reception is not performed at the terminal. The guard time between consecutive non-SBFD symbols and SBFD symbols for the downlink reception may be set to a certain number of symbols or defined based on the capability of each terminal and / or the SCS value of the cell / carrier / DL BWP. The guard time is set to the certain number of symbols in reverse chronological order from the last symbol before the symbol type change boundary. Alternatively, the guard time is set to the certain number of symbols in chronological order from the first symbol after the symbol type change boundary. Alternatively, the guard time is set to the certain number of symbols only in a specific symbol type adjacent to the symbol type change boundary. The boundary may be the time at which a symbol type change starts or ends.

[0146] At any terminal, PDSCH reception including the guard time can be indicated by the base station via DCI or set and activated via a configured grant. In this case, PDSCH allocation resources in the symbol corresponding to the guard time can be punctured or rate-matched.

[0147] The terminal may not expect CSI measurement and reporting settings for the symbol corresponding to the guard time, or may ignore the settings. Alternatively, when performing downlink channel measurement and CSI reporting based on the settings, the terminal may be configured to perform channel measurement and CSI reporting excluding the CSI-RS instance corresponding to the guard time.

[0148] The terminal does not perform PDCCH monitoring in the symbol corresponding to the guard time. For example, if a PDCCH monitoring occasion based on the search space configuration of a certain terminal includes part or all of the guard time, the terminal may skip PDCCH monitoring for that PDCCH occasion.

[0149] For uplink

[0150] The above guard time can be set between uplink symbols of the terminal.

[0151] When a terminal transmits uplink, if a UL transmission symbol of a non-SBFD symbol and a UL transmission symbol of an SBFD symbol are consecutive, a certain number of symbols before or after the boundary where the symbol type is changed can be set as a guard time during which uplink transmission is not performed at the terminal. The guard time between consecutive non-SBFD symbols and SBFD symbols for the uplink transmission can be set to a certain number of symbols or defined based on the capability of each terminal and / or the SCS value of the cell / carrier / DL BWP. The guard time is set to the certain number of symbols in reverse chronological order from the last symbol before the symbol type switching boundary. Alternatively, the guard time is set to the certain number of symbols in chronological order from the first symbol after the symbol type switching boundary. Alternatively, the guard time is set to the certain number of symbols only in a specific symbol type adjacent to the symbol type switching boundary. In addition, the uplink guard time can be determined by the same size / method as the downlink guard time.

[0152] When a PUSCH transmission including the guard time is indicated by the base station through DCI or set and activated through a configured grant at any terminal, the PUSCH allocation resource in the symbol corresponding to the guard time may be punctured or rate matching may be applied. Alternatively, the entire PUSCH transmission may be dropped.

[0153] The terminal may drop the PUCCH transmission if the PUCCH transmission is set or instructed in the symbol corresponding to the guard time.

[0154] The terminal may drop the SRS transmission if the SRS transmission is set or triggered in the symbol corresponding to the guard time.

[0155] However, the PDSCH / PUSCH / PUCCH that is subject to puncturing, rate matching, or dropping for PDSCH / PUSCH / PUCCH transmission including the guard time in the above refers to the nominal PDSCH / PUSCH / PUCCH. That is, when any PDSCH / PUSCH / PUCCH is repeated, the puncturing, rate matching, or dropping can be applied only to the nominal PDSCH / PUSCH / PUCCH that overlaps with the actual guard time among the N repetitions.

[0156] In this way, when downlink or uplink data transmission and reception is performed via consecutive symbols, a guard time can be set to ensure normal data communication when the symbol types of consecutive symbols are different. Furthermore, the terminal and base station can mutually recognize the operation in the symbol corresponding to the guard time, thereby ensuring uninterrupted data communication.

[0157] Below, the terminal and base station devices capable of performing the aforementioned embodiments will be described again, focusing on their configuration.

[0158] Fig. 12 is a drawing showing the configuration of a terminal according to another embodiment.

[0159] Referring to FIG. 12, a terminal (1200) that transmits and receives data in a mobile communication system supporting sub-band full duplex (SBFD) communication may include a receiving unit (1230) that receives control information for uplink data transmission or downlink data reception, and a control unit (1210) that controls uplink data or downlink data transmission and reception operations through two consecutive symbols set to different symbol types.

[0160] Here, two consecutive symbols set to different symbol types are a first type symbol for which subband-based full-duplex (SBFD) communication is set and a second type symbol for which subband-based full-duplex communication is not set. In addition, a guard time is included between the first type symbol and the second type symbol.

[0161] For example, in order to transmit uplink data, the receiving unit (1230) may receive scheduling information including radio resources for uplink data transmission from the base station. Similarly, in order to receive downlink data, the receiving unit (1230) may also receive scheduling information of a downlink data channel.

[0162] Additionally, uplink data transmission or downlink data reception means not only data transmission but also transmission resources for reference signals, etc. Accordingly, the receiving unit (1230) can receive scheduling information including radio resources for uplink reference signal transmission or downlink reference signal reception.

[0163] The aforementioned control information may be received by at least one of downlink control information, upper layer signaling, MAC CE, and system information. Alternatively, the control information may be received by the terminal according to a combination of two or more signals, such as upper layer signaling (RRC configuration information) and MAC CE or DCI.

[0164] Meanwhile, the receiver (1230) may be set to a duplex mode of FDD or TDD, and in the case of TDD duplex mode, may receive configuration information for configuring TDD symbols or slots. In addition, the receiver (1230) may further receive configuration information for configuring subband-based full-duplex communication.

[0165] In FDD duplex mode, uplink and downlink are distinguished according to the frequency band. In this case, a guard band can be set to prevent interference between uplink and downlink. In TDD duplex mode, flexible symbols or slots can be set to switch between uplink symbols or slots and downlink symbols or slots to obtain time according to interference occurrence and switching. However, when changing from an uplink symbol or slot to a downlink symbol or slot, flexible symbol or slot setting may not be necessary depending on the TA (Timing Advance) value and the downlink transmission propagation delay at the base station.

[0166] However, in the case where subband full-duplex communication is established as in the present disclosure, each symbol can be divided into a first type symbol and a second type symbol. The control unit (1210) can control the scheduling operation of downlink data reception or uplink data transmission for two or more consecutive symbols according to the control information. In this case, the control unit (1210) can control downlink data reception or uplink data transmission by monitoring the radio resources of two or more scheduled consecutive symbols.

[0167] If subband full-duplex communication is supported, Type 1 and Type 2 symbols may be configured consecutively. In this case, depending on the TDD configuration, the terminal may be configured to receive downlink data in both Type 1 and Type 2 symbols. Alternatively, the terminal may be configured to transmit uplink data in both Type 1 and Type 2 symbols.

[0168] When the symbol types of consecutive symbols change, interference or problems may occur in the transmitted and received data due to changes in the antenna settings of the base station, changes in the surrounding interference environment, etc. Therefore, when two consecutive symbols have different symbol types, such as a first type symbol and a second type symbol, a guard time may be included between the first type symbol and the second type symbol.

[0169] Guard times can be defined and set by a preset number of symbols. For example, guard times can be transmitted to terminals through control information or configuration information, allowing both terminals and base stations to recognize them.

[0170] The control unit (1210) can apply guard time when symbols of different symbol types are consecutive in controlling downlink data or uplink data transmission and reception operations.

[0171] For example, downlink data may be configured to be punctured or rate-matched in symbols corresponding to guard times. During guard times, the base station may puncture radio resources to prevent downlink data transmission. Alternatively, rate matching may be configured to be applied during guard times. Such puncturing, etc., may be communicated to the terminal through downlink data scheduling via control information. Alternatively, the terminal and base station may be aware of downlink data puncturing, etc., during guard times through prior configuration.

[0172] As another example, when downlink data is a reference signal, a channel measurement operation may be performed excluding reference signal instances in symbols corresponding to the guard time, or a PDCCH monitoring operation may be stopped in symbols corresponding to the guard time. For example, when CSI-RS, etc. are transmitted, the control unit (1210) may not measure the CSI-RS in symbols corresponding to the guard time, or may exclude the measurement value for the corresponding CSI-RS when reporting the measurement. Alternatively, the control unit (1210) does not assume transmission of the PDCCH in symbols set as guard times. Accordingly, the control unit (1210) does not perform a PDCCH monitoring operation in the corresponding symbol.

[0173] As another example, uplink data may be configured to be punctured, rate-matched, and dropped in symbols corresponding to guard times. For example, when a terminal transmits uplink data according to scheduling information, the uplink data may be punctured in symbols corresponding to guard times. Alternatively, the control unit (1210) may apply rate matching to the corresponding symbol. Alternatively, the control unit (1210) may drop uplink data transmission in symbols corresponding to guard times. Puncturing refers to transmitting uplink data without using radio resources in the corresponding symbol, and dropping refers to not transmitting some of the uplink data allocated to the corresponding symbol and transmitting the remainder if it is scheduled to be transmitted in the corresponding symbol.

[0174] As another example, the control unit (1210) may drop the PUCCH transmission or reference signal transmission when the PUCCH transmission or reference signal transmission is instructed in the symbol corresponding to the guard time. For example, the reference signal may be an SRS, etc.

[0175] Meanwhile, the PDSCH / PUSCH / PUCCH that is subject to puncturing, rate matching, or dropping in the PDSCH / PUSCH / PUCCH transmission in the symbol corresponding to the guard time refers to the nominal PDSCH / PUSCH / PUCCH.

[0176] In addition, the control unit (1210) controls the overall operation of the terminal (1200) according to the operation of transmitting and receiving data in different types of consecutive symbols required to perform the aforementioned embodiment.

[0177] The transmitter (1220) and receiver (1230) are used to transmit and receive signals, messages, and data necessary to perform the aforementioned embodiment with the base station.

[0178] Fig. 13 is a drawing showing the configuration of a base station according to another embodiment.

[0179] Referring to FIG. 13, a base station (1300) that controls data transmission and reception of a terminal in a mobile communication system supporting sub-band full duplex (SBFD) communication may include a transmitter (1320) that transmits control information for uplink data transmission or downlink data reception of the terminal to the terminal, and a control unit (1310) that controls transmission and reception of uplink data or downlink data through two consecutive symbols set to different symbol types.

[0180] Two consecutive symbols set to different symbol types are a type 1 symbol for which subband-based full duplex (SBFD) communication is set and a type 2 symbol for which subband-based full duplex communication is not set. A guard time is included between the type 1 symbol and the type 2 symbol.

[0181] For example, the transmitter (1320) may transmit scheduling information including radio resources for uplink data transmission to a terminal for transmitting uplink data. Similarly, the transmitter (1320) may also transmit scheduling information for a downlink data channel to a terminal for transmitting downlink data.

[0182] Additionally, uplink data transmission or downlink data reception means not only data transmission but also transmission resources for reference signals. Accordingly, the transmitter (1320) can transmit scheduling information including radio resources for uplink reference signal reception or downlink reference signal transmission.

[0183] The aforementioned control information may be transmitted by at least one of downlink control information, upper layer signaling, MAC CE, and system information. Alternatively, the control information may be transmitted to the terminal by a combination of two or more signals, such as upper layer signaling (RRC configuration information) and MAC CE or DCI.

[0184] Meanwhile, the terminal may be set to a duplex mode of FDD or TDD, and in the case of TDD duplex mode, may receive configuration information for configuring TDD symbols or slots. Additionally, configuration information for configuring subband-based full-duplex communication may be received.

[0185] In FDD duplex mode, uplink and downlink are distinguished according to the frequency band. In this case, a guard band can be set to prevent interference between uplink and downlink. In TDD duplex mode, flexible symbols or slots can be set to switch between uplink symbols or slots and downlink symbols or slots to obtain time according to interference occurrence and switching. However, when changing from an uplink symbol or slot to a downlink symbol or slot, flexible symbol or slot setting may not be necessary depending on the TA (Timing Advance) value and the downlink transmission propagation delay at the base station.

[0186] However, in the case where subband full-duplex communication is established as in the present disclosure, each symbol can be divided into a first type symbol and a second type symbol. The control unit (1310) can schedule downlink data reception or uplink data transmission to the terminal for two or more consecutive symbols using control information. In this case, the terminal can monitor the radio resources of two or more consecutive scheduled symbols to receive downlink data or transmit uplink data.

[0187] If subband full-duplex communication is supported, Type 1 and Type 2 symbols may be configured consecutively. In this case, depending on the TDD configuration, the terminal may be configured to receive downlink data in both Type 1 and Type 2 symbols. Alternatively, the terminal may be configured to transmit uplink data in both Type 1 and Type 2 symbols.

[0188] When the symbol types of consecutive symbols change, interference or problems may occur in the transmitted and received data due to changes in the antenna settings of the base station, changes in the surrounding interference environment, etc. Therefore, when two consecutive symbols have different symbol types, such as a first type symbol and a second type symbol, a guard time may be included between the first type symbol and the second type symbol.

[0189] Guard times can be defined and set by a preset number of symbols. For example, guard times can be transmitted to terminals through control information or configuration information, allowing both terminals and base stations to recognize them.

[0190] When controlling downlink data or uplink data transmission and reception operations, the terminal may apply guard time when symbols of different symbol types are consecutive.

[0191] For example, downlink data may be configured to be punctured or rate-matched in symbols corresponding to guard times. During the guard time, the control unit (1310) may puncture radio resources to prevent downlink data from being transmitted. Alternatively, rate-matching may be configured to be applied during the guard time. Such puncturing, etc. may be communicated to the terminal through downlink data scheduling via control information. Alternatively, the terminal and base station may be aware of downlink data puncturing, etc. during the guard time through presetting.

[0192] As another example, when downlink data is a reference signal, the terminal may perform a channel measurement operation excluding reference signal instances in symbols corresponding to the guard time, or may stop performing a PDCCH monitoring operation in symbols corresponding to the guard time. For example, when CSI-RS, etc. are transmitted, the terminal may not measure the CSI-RS in symbols corresponding to the guard time, or may exclude the measurement value for the corresponding CSI-RS when reporting the measurement. Alternatively, the transmitter (1320) does not transmit the PDCCH in symbols set as guard times. Accordingly, the terminal does not perform a PDCCH monitoring operation in the corresponding symbols.

[0193] As another example, uplink data may be configured to be punctured, rate-matched, and dropped in symbols corresponding to guard times. For example, when a terminal transmits uplink data according to scheduling information, the uplink data may be punctured in symbols corresponding to guard times. Alternatively, the terminal may apply rate matching in the corresponding symbol. Alternatively, the terminal may drop uplink data transmission in symbols corresponding to guard times. Puncturing refers to transmitting uplink data without using radio resources in the corresponding symbol, and dropping refers to not transmitting some of the uplink data allocated to the corresponding symbol and transmitting the remainder if it is scheduled to be transmitted in the corresponding symbol.

[0194] As another example, a terminal may drop a PUCCH transmission or a reference signal transmission if a PUCCH transmission or a reference signal transmission is indicated in a symbol corresponding to the guard time. For example, the reference signal may be an SRS.

[0195] Meanwhile, the PDSCH / PUSCH / PUCCH that is subject to puncturing, rate matching, or dropping in the PDSCH / PUSCH / PUCCH transmission in the symbol corresponding to the guard time refers to the nominal PDSCH / PUSCH / PUCCH.

[0196] In addition, the control unit (1310) controls the overall operation of the base station (1300) according to the operation of transmitting and receiving data in different types of consecutive symbols required to perform the aforementioned embodiment.

[0197] The transmitter (1320) and receiver (1330) are used to transmit and receive signals, messages, and data necessary for performing the aforementioned embodiment to and from the terminal.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204]

[0205] CROSS-REFERENCE TO RELATED APPLICATION

[0206] This patent application claims priority under 35 USC §119(a) to Korean Patent Application No. 10-2024-0022625, filed in Korea on February 16, 2024, and Korean Patent Application No. 10-2025-0019003, filed in Korea on February 13, 2025, the entire contents of which are incorporated herein by reference. In addition, this patent application claims priority in countries other than the United States for the same reasons, the entire contents of which are incorporated herein by reference.

Claims

1. In a method for a terminal to transmit and receive data in a mobile communication system supporting sub-band full duplex communication (SBFD), A step of receiving control information for uplink data transmission or downlink data reception; and A step of controlling the transmission and reception operation of the uplink data or downlink data through two consecutive symbols set to different symbol types, Two consecutive symbols set to different symbol types are A method comprising a first type symbol in which subband-based full duplex (SBFD) communication is established and a second type symbol in which the subband-based full duplex communication is not established, wherein a guard time is included between the first type symbol and the second type symbol.

2. In paragraph 1, The above guard time is, A method that is set to a preset number of symbols.

3. In paragraph 1, The above downlink data is, A method for setting puncturing or rate matching in symbols corresponding to the above guard time.

4. In paragraph 1, The above controlling step is, A method of performing a channel measurement operation excluding a reference signal instance in a symbol corresponding to the guard time, or of stopping a PDCCH monitoring operation in a symbol corresponding to the guard time.

5. In paragraph 1, The above uplink data is, A method for setting puncturing, rate matching and dropping in symbols corresponding to the above guard time.

6. In paragraph 1, The above controlling step is, A method for dropping the PUCCH or reference signal when PUCCH transmission or reference signal transmission is indicated in a symbol corresponding to the guard time.

7. In a mobile communication system supporting sub-band full duplex communication (SBFD), a method for a base station to control data transmission and reception of a terminal, A step of transmitting control information for uplink data transmission or downlink data reception of the terminal to the terminal; and A step of controlling the transmission and reception operation of the uplink data or downlink data through two consecutive symbols set to different symbol types, Two consecutive symbols set to different symbol types are A method comprising a first type symbol in which subband-based full duplex (SBFD) communication is established and a second type symbol in which the subband-based full duplex communication is not established, wherein a guard time is included between the first type symbol and the second type symbol.

8. In paragraph 7, The above guard time is, A method that is set to a preset number of symbols.

9. In paragraph 7, The above downlink data is, A method for setting puncturing or rate matching in symbols corresponding to the above guard time.

10. In paragraph 7, The above uplink data is, A method for setting puncturing, rate matching and dropping in symbols corresponding to the above guard time.

11. In a terminal transmitting and receiving data in a mobile communication system supporting sub-band full duplex communication (SBFD), A receiving unit that receives control information for uplink data transmission or downlink data reception; and Including a control unit that controls the transmission and reception operation of the uplink data or downlink data through two consecutive symbols set to different symbol types, Two consecutive symbols set to different symbol types are A terminal having a first type symbol for which subband-based full duplex (SBFD) communication is established and a second type symbol for which the subband-based full duplex communication is not established, and a guard time is included between the first type symbol and the second type symbol.

12. In paragraph 11, The above guard time is, A terminal set to a preset number of symbols.

13. In paragraph 11, The above downlink data is, A terminal configured to perform puncturing or rate matching in symbols corresponding to the above guard time.

14. In paragraph 11, The above control unit, A terminal that performs a channel measurement operation excluding a reference signal instance in a symbol corresponding to the guard time, or stops performing a PDCCH monitoring operation in a symbol corresponding to the guard time.

15. In paragraph 11, The above uplink data is, A terminal configured to perform puncturing, rate matching, and dropping on symbols corresponding to the above guard time.

16. In paragraph 11, The above control unit, A terminal that drops the PUCCH or reference signal when PUCCH transmission or reference signal transmission is indicated in a symbol corresponding to the guard time.

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