Uplink and downlink transmission / reception method and apparatus in full duplex communication

Abstract

The present embodiment provides a method in which a terminal performs uplink transmission or downlink reception in full duplex communication, comprising: a step in which a downlink slot and a downlink symbol, and configuration information for the uplink slot and the uplink symbol are received; a step of receiving configuration information of a sub-band for full duplex communication and configuration information of an SBFD slot or an SBFD symbol; and a step of performing uplink transmission or downlink reception on the basis of the transmission direction link configuration information in the SBFD slot or the SBFD symbol.

Description

Technical Field

[0001] This embodiment provides an uplink and downlink transmission / reception method and apparatus in a next generation radio access network (hereinafter referred to as New Radio (NR)). Background Art

[0002] Recently, 3GPP approved the "Study on New Radio Access Technology" research topic for next-generation radio access technology (i.e., 5G radio access technology). Based on this research, RAN WG1 is designing the frame structure, channel coding and modulation, waveform, and multiple access scheme for NR (New Radio). NR needs to be designed to not only offer higher data rates than LTE but also meet the various Quality of Service (QoS) requirements for each specific and segmented usage scenario.

[0003] As typical use cases for NR, eMBB (enhancement Mobile Broadband), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication) have been defined. To meet the requirements of each use case, a flexible frame structure relative to LTE needs to be designed.

[0004] Since each usage scenario has different requirements for data rates, latency, reliability, coverage, etc., as a method to effectively meet the requirements of each usage scenario by constituting the frequency band of any NR system, a solution for effectively multiplexing radio resource units based on different numerologies (for example, subcarrier spacing, subframe, TTI (Transmission Time Interval), etc.) is proposed.

[0005] As part of this, a specific design is required for wireless networks that can implement uplink and downlink transmission / reception in symbols suitable for full-duplex communication. Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Embodiments of the present disclosure may provide uplink and downlink transmission / reception methods and apparatuses in full-duplex communication.

[0008] Solutions for solving problems

[0009] On the one hand, this embodiment can provide a method for a terminal to perform uplink transmission or downlink reception in full-duplex communication (Full Duplex), including: the steps of receiving configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols; the steps of receiving configuration information of subbands used for full-duplex communication and configuration information of subband full-duplex (SBFD) time slots or SBFD symbols; and the steps of performing uplink transmission or downlink reception based on the transmission direction link configuration information in the SBFD time slots or SBFD symbols.

[0010] On the other hand, this embodiment can provide a method for a base station to perform uplink reception or downlink transmission in full-duplex communication (Full Duplex), including: the steps of transmitting configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols; the steps of transmitting configuration information of subbands used for full-duplex communication and configuration information of subband full-duplex (SBFD) time slots or SBFD symbols; and the steps of performing uplink reception or downlink transmission based on the transmission direction link configuration information in the SBFD time slots or SBFD symbols.

[0011] On the other hand, this embodiment can provide a terminal that performs uplink transmission or downlink reception in full-duplex communication (Full Duplex), including: a transmitting part; a receiving part; and a control part for controlling the operation of the transmitting part and the receiving part, wherein, in the control part, configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols are received, configuration information of subbands used for full-duplex communication and configuration information of subband full-duplex (SBFD) time slots or SBFD symbols are received, and uplink transmission or downlink reception is performed based on the transmission direction link configuration information in the SBFD time slots or SBFD symbols.

[0012] On the other hand, this embodiment can provide a base station that performs uplink reception or downlink transmission in full-duplex communication (Full Duplex), including: a transmitting part; a receiving part; and a control part for controlling the operation of the transmitting part and the receiving part, wherein, in the control part, configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols are transmitted, configuration information of subbands for full-duplex communication and configuration information of subband full-duplex (SBFD) time slots or SBFD symbols are transmitted, and uplink reception or downlink transmission is performed based on the transmission direction link configuration information in the SBFD time slots or SBFD symbols.

[0013] Effects of the Invention

[0014] According to this embodiment, a method and apparatus for efficiently performing uplink and downlink transmission / reception in a time slot or symbol applicable to full-duplex communication can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram that simply shows the structure of an NR wireless communication system applicable to this embodiment.

[0016] Figure 2 This is a diagram used to illustrate the frame structure in the NR system to which this embodiment is applicable.

[0017] Figure 3 This is a diagram for explaining a resource grid supporting a radio access technology to which this embodiment is applicable.

[0018] Figure 4 This is a diagram for explaining a bandwidth portion supporting a wireless access technology to which this embodiment is applicable.

[0019] Figure 5 This is a diagram exemplarily showing a synchronization signal block in a wireless access technology to which this embodiment is applicable.

[0020] Figure 6 This is a diagram for explaining a random access procedure in a wireless access technology to which this embodiment is applicable.

[0021] Figure 7 This is a diagram for explaining CORESET.

[0022] Figure 8 FIG. 1 is a diagram illustrating a process of performing uplink transmission and downlink reception by a terminal according to one embodiment.

[0023] Figure 9FIG. 1 is a diagram illustrating a process of performing uplink reception and downlink transmission by a base station according to one embodiment.

[0024] Figure 10 and Figure 11 is a diagram for explaining a TDD frame in which an uplink subband is set in a downlink time slot according to one embodiment.

[0025] Figure 12 is a diagram for explaining setting of transmission direction link configuration information in a subband full duplex (SBFD) symbol according to one embodiment.

[0026] Figure 13 is a diagram showing a structure of a terminal according to another embodiment.

[0027] Figure 14 is a diagram showing the structure of a base station according to another embodiment. DETAILED DESCRIPTION

[0028] Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. When assigning reference numerals to the components of each drawing, the same symbols may be assigned to the same components as much as possible even if they are shown in different drawings. In addition, when describing the present embodiment, if it is considered that the specific description of the relevant well-known structures or functions will obscure the main idea of the present technology, its detailed description may be omitted. In this specification, when referring to "including", "having", "comprising", etc., unless "only" is used, it means that other parts may be added. In the case of representing a component in the singular, the plural case may be included unless there is a special clear record.

[0029] In addition, when describing the components of the present disclosure, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, sequence, or number of the component is not limited by these terms.

[0030] In the description of the positional relationship of components, if it is stated that two or more components are "connected," "coupled," or "accessed," the two or more components may be directly "connected," "coupled," or "accessed," but it should be understood that other components may also "intervene" between the two or more components, thereby forming the "connection," "combination," or "access." The other components may also include one or more of the two or more components that are "connected," "coupled," or "accessed" to each other.

[0031] In the description of the time process relationship related to components, operating methods or manufacturing methods, when the time sequence relationship or process sequence relationship is described by, for example, "afterwards", "followed", "next", "before", etc., discontinuous situations may also be included unless "immediately" or "directly" is used.

[0032] On the other hand, when referring to the numerical value of a component or its corresponding information (e.g., grade, etc.), even if there is no separate explicit statement, the numerical value or its corresponding information should be interpreted as including the error range that may arise due to various factors (e.g., process factors, internal or external impact, noise, etc.).

[0033] The wireless communication system in this specification refers to a system that uses wireless resources to provide various communication services such as voice and data packets. The system may include: terminals, base stations or core networks, etc.

[0034] The embodiments disclosed below are applicable to wireless communication systems using a variety of radio access technologies. For example, the embodiments are applicable to a variety of radio access technologies, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), or non-orthogonal multiple access (NOMA). Furthermore, radio access technology not only refers to a specific access technology but also refers to various generations of communication technologies specified by various communication protocol organizations, such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, ITU, etc. For example, CDMA can be implemented through radio technologies such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be implemented using wireless technologies such as the Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi, wireless LAN), IEEE 802.16 (WiMAX, Worldwide Interoperability for Microwave Access), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m, as an evolution of IEEE 802.16e, provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the Universal Mobile Telecommunications System (UMTS).The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE), as part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA), employs OFDMA in the downlink and SC-FDMA in the uplink. As described above, this embodiment can be applied to currently available or commercialized radio access technologies, as well as to radio access technologies currently under development or to be developed in the future.

[0035] On the other hand, the term "terminal" in this specification is a comprehensive concept that refers to a device that includes a wireless communication module that communicates with a base station in a wireless communication system. It should be interpreted as including not only user equipment (UE) in Wideband Code Division Multiple Access (WCDMA), LTE, New Radio (NR), High Speed Packet Access (HSPA), and IMT-2020 (5G or New Radio), but also mobile stations (MS), user terminals (UT), subscriber stations (SS), and wireless devices in GSM. In addition, depending on the usage form, the terminal can be a user portable device such as a smartphone. In the vehicle to everything (V2X) communication system, it can also mean a vehicle, a device including a wireless communication module in the vehicle, etc. In addition, in a machine type communication system, it can also mean an MTC terminal equipped with a communication module to perform machine type communication, a machine to machine (M2M) terminal, and an ultra-reliable low-latency communication (URLLC) terminal.

[0036] In this specification, a base station or cell refers to a terminal that communicates with a terminal in a network context, and may encompass various coverage areas, such as: Node-B, evolved Node-B (eNB), gNB (gNode-B), Low Power Node (LPN), sector, site, various antenna types, base transceiver system (BTS), access point, point (e.g., transmission point, reception point, transmission / reception point), relay node, ultra-large cell, macro cell, micro cell, pico cell, femto cell, remote radio head (RRH), radio unit (RU), small cell, etc. Furthermore, a cell may also include a bandwidth part (BWP) in the frequency domain. For example, a serving cell may refer to the activation BWP of a terminal.

[0037] Since there are base stations controlling more than one cell in the various types of cells listed above, the base station can be interpreted in two ways. It can indicate: (1) the device itself, which provides a supercell, macrocell, microcell, picocell, femtocell or small cell related to the wireless area; (2) the wireless area itself. In case (1), all devices that interact so that the devices providing the specified wireless area are controlled by the same object or that configure the wireless area through cooperation are indicated as base stations. According to the configuration method of the wireless area, an embodiment of the base station is: point, transmission / reception point, transmission point, reception point, etc. In case (2), from the perspective of the user terminal or the standpoint of the adjacent base station, the wireless area itself that receives or transmits signals can also be indicated as a base station.

[0038] In this specification, a cell may refer to a coverage area of a signal transmitted from a transmission / reception point, a component carrier having coverage area of a signal transmitted from a transmission / reception point, or the transmission / reception point itself.

[0039] The uplink (UL, or uplink) refers to the method by which a terminal transmits / receives data to / from a base station, while the downlink (DL, or downlink) refers to the method by which a base station transmits / receives data to / from a terminal. A downlink can refer to communication or a communication path from multiple transmission / reception points to a terminal, while an uplink can refer to communication or a communication path from a terminal to multiple transmission / reception points. In this case, in the downlink, a transmitter can be part of multiple transmission / reception points, and a receiver can be part of a terminal. Furthermore, in the uplink, a transmitter can be part of a terminal, and a receiver can be part of multiple transmission / reception points.

[0040] The uplink and downlink transmit and receive control information via control channels such as the Physical Downlink Control Channel (PDCCH) and the Physical Uplink Control Channel (PUCCH). Data is transmitted and received via data channels such as the Physical Downlink Shared Channel (PDSCH) and the Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission and reception of signals via channels such as the PUCCH, PUSCH, PDCCH, and PDSCH will be referred to as "transmission and reception of PUCCH, PUSCH, PDCCH, and PDSCH."

[0041] For a clearer explanation, the following describes the technical concept mainly based on the 3GPP LTE / LTE-A / NR (New RAT) communication system, but the technical features are not limited to this communication system.

[0042] In 3GPP, after studying the fourth-generation mobile information system (4th-Generation, 4G) communication technology, the fifth-generation mobile information system (5th-Generation, 5G) communication technology that meets the requirements of the ITU-R for the next-generation wireless access technology is developed. Specifically, 3GPP develops new NR communication technology through 5G communication technology, which is different from LTE-A pro and 4G communication technology that improves LTE-Advanced technology in a manner that meets the requirements of ITU-R. LTE-A pro and NR both mean 5G communication technology. In the following, when no specific communication technology is specifically mentioned, 5G communication technology will be explained with NR as the center.

[0043] The operational scenarios in NR add satellite, automotive, and new vertical considerations to the existing 4G LTE scenarios, and define multiple operating scenarios. In terms of services, it supports enhanced mobile broadband (eMBB) scenarios; massive machine communication (mMTC) scenarios, which have high terminal density and are deployed over a wide area, and require low data rates and asynchronous access; ultra-reliable and low-latency communication (URLLC) scenarios, which require high responsiveness and reliability and can support high-speed mobility.

[0044] To meet these scenarios, NR discloses a wireless communication system that applies new waveform and frame structure technologies, low latency technologies, ultra-high frequency band (mmWave) support technologies, and forward compatibility technologies. In particular, in order to provide forward compatibility in the NR system, various technical changes are proposed in terms of flexibility. The following will describe the main technical features of NR with reference to the accompanying drawings.

[0045] <Normal NR system>

[0046] Figure 1 This is a diagram that simply shows the structure of the NR system applicable to this embodiment.

[0047] Reference Figure 1, the NR system is divided into 5GC (5G Core Network) and NR-RAN (New Radio Radio Access Network) parts. NG-RAN (Next Generation Radio Access Network) consists of gNB and ng-eNB that provide the user plane (SDAP (Service Data Adaptation Protocol) / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC (Medium Access Control) / PHY (Physical Layer)) and the control plane (RRC) protocol termination for the UE (User Equipment). gNBs are interconnected with each other or gNB and ng-eNB are interconnected via the Xn interface. gNB and ng-eNB are connected to 5GC via the NG interface respectively. 5GC may include: Access and Mobility Management Function (AMF), which is responsible for the control plane such as terminal access and mobility control functions; and User Plane Function (UPF), which is responsible for user data control functions. NR supports both frequency bands below 6 GHz (FR1, Frequency Range 1) and above 6 GHz (FR2, Frequency Range 2).

[0048] gNB means a base station that provides the NR user plane and control plane protocol termination to the terminal, and ng-eNB means a base station that provides the E-UTRA user plane and control plane protocol termination to the terminal. The base station described in this specification should be understood to cover the meanings of gNB and ng-eNB, and can also be used according to the meaning of differentiating gNB or ng-eNB as needed.

[0049] <Waveform, Parameter Set and Frame Structure in NR>

[0050] In NR, for downlink transmission, the CP-OFDM (Cyclic prefix Orthogonal Frequency Division Multiplexing) waveform with a cyclic prefix is used, and for uplink transmission, CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing) is used. OFDM technology is easy to combine with Multiple Input Multiple Output (MIMO), and its advantages are high frequency efficiency and the ability to use a receiver with low complexity.

[0051] On the other hand, in NR, since the requirements for data speed, latency, and coverage vary across the three scenarios mentioned above, it is necessary to efficiently meet the requirements of each scenario using the frequency bands that make up any NR system. To this end, a technology for efficiently multiplexing radio resources based on multiple different numerologies has been proposed.

[0052] Specifically, the NR transmission parameter set is determined based on the sub-carrier spacing and CP (Cyclic prefix), as shown in Table 1 below. Taking 15kHz as the benchmark, the μ value is used as an exponential value of 2 and changes in an exponential form.

[0053]

Table 1

[0054]

[0055] As shown in Table 1 above, NR parameter sets can be divided into 5 types according to the subcarrier spacing. This is different from LTE, one of the 4G communication technologies, in which the subcarrier spacing is fixed at 15kHz. Specifically, the subcarrier spacing used for data transmission in NR is 15kHz, 30kHz, 60kHz and 120kHz, and the subcarrier spacing for synchronization signal transmission is 15kHz, 30kHz, 12kHz and 240kHz. In addition, the extended CP is only applicable to 60kHz subcarrier spacing. On the other hand, the frame structure in NR defines a frame with a length of 10ms, and the above frame consists of 10 subframes with the same length of 1ms. A frame can be divided into half frames of 5ms, and each half frame includes 5 subframes. In the case of 15kHz subcarrier spacing, a subframe consists of a time slot, and each time slot consists of 14 OFDM symbols. Figure 2 This is a diagram for explaining the frame structure in the NR system to which this embodiment is applicable. Figure 2 In the case of a normal CP, a slot is fixed to consist of 14 OFDM symbols, but in the time domain of the slot, the length can vary according to the subcarrier spacing. For example, in the case of a parameter set with a 15kHz subcarrier spacing, the length of the slot is 1ms, the same as the length of the subframe. In contrast, in the case of a parameter set with a 30kHz subcarrier spacing, although the slot consists of 14 OFDM symbols, the length is 0.5ms, and two slots can be included in one subframe. That is, subframes and frames are defined by a fixed time length, while the slot is defined by the number of symbols, and the time length can vary according to the subcarrier spacing.

[0056] On the other hand, in NR, the basic unit of scheduling is defined as a time slot. To reduce the transmission delay in the wireless section, mini-slots (or sub-slots or non-slot-based scheduling) are also introduced. If a wide subcarrier spacing is used, the length of a time slot will become shorter inversely, so the transmission delay in the wireless section can be reduced. Mini-slots (or sub-slots) are used to effectively support the URLLC scenario and can be scheduled in units of 2, 4, or 7 symbols.

[0057] In addition, different from LTE, NR defines the uplink and downlink resource allocation as the symbol level within a time slot. To reduce the HARQ (Hybrid Automatic Repeat reQuest) delay, a time slot structure in which HARQ ACK / NACK (Hybrid Automatic Repeat reQuest - Acknowledgment / Negative Acknowledgment) can be directly transmitted within the transmission time slot is defined, and this time slot structure is described by naming it a self-contained structure.

[0058] In NR, it is designed to support a total of 256 time slot formats, among which 62 time slot formats are used for 3GPP Rel-15. In addition, through various combinations of time slots, it supports the common frame structure that composes the FDD or TDD frame. For example, it supports the time slot structure where all symbols of the time slot are set as downlink, the time slot structure where all symbols are set as uplink, and the time slot structure where downlink symbols and uplink symbols are combined. In addition, NR supports scheduling data transmission scattered in more than one time slot. Therefore, the base station can use the Slot Format Indicator (SFI) to notify the terminal whether the time slot is a downlink time slot, an uplink time slot, or a flexible time slot. The base station can use the SFI indication to indicate the time slot format by means of the table index constituted by UE-specific RRC signaling, or can also perform dynamic indication through Downlink Control Information (DCI) or static or quasi-static indication through RRC.

[0059] <Physical Resources in NR>

[0060] Regarding the physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, bandwidth parts, etc. can be considered.

[0061] Antenna ports are defined such that the channel carrying symbols on that antenna port can be inferred from the channel carrying other symbols on the same antenna port. Two antenna ports are considered to be in a QC / QCL (quasico-located) relationship if the large-scale properties of the channel carrying symbols on one antenna port can be inferred from the channel carrying symbols on another antenna port. The large-scale properties include one or more of the following: delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0062] Figure 3 This is a diagram for explaining a resource grid supporting a radio access technology to which this embodiment is applicable.

[0063] Reference Figure 3 As for the resource grid, since NR supports multiple parameter sets in the same carrier, a resource grid can exist for each parameter set. In addition, a resource grid can exist based on the antenna port, subcarrier spacing, and transmission direction.

[0064] A resource block consists of 12 subcarriers and is defined only in the frequency domain. In addition, a resource element consists of one OFDM symbol and one subcarrier. Figure 3 As shown, the size of one resource block can vary depending on the subcarrier spacing. In addition, NR defines "Point A" which serves as a common reference point for the resource block grid, common resource blocks, virtual resource blocks, etc.

[0065] Figure 4 This is a diagram for explaining a bandwidth portion supporting a wireless access technology to which this embodiment is applicable.

[0066] In NR, unlike LTE where the carrier bandwidth is fixed at 20 MHz, the maximum carrier bandwidth for each subcarrier spacing is set to 50 MHz to 400 MHz. Therefore, it is not assumed that all terminals use these carrier bandwidths. Figure 4As shown, a bandwidth part (BWP) can be specified within the carrier bandwidth for use by a terminal. In addition, the bandwidth part is associated with a parameter set, consists of a subset of consecutive common resource blocks, and can be dynamically activated according to time. The terminal is configured to have up to 4 bandwidth parts for the uplink and downlink respectively, and transmits / receives data using the activated bandwidth part within a specified time.

[0067] In the case of a paired spectrum, the uplink and downlink bandwidth parts are set independently. In the case of an unpaired spectrum, to prevent unnecessary frequency re-tuning between downlink and uplink operations, the downlink and uplink bandwidth parts are paired and set to share the center frequency.

[0068] <Initial Access in NR>

[0069] In NR, the terminal performs cell search and random access procedures to access the base station for communication.

[0070] Cell search is a process that uses the synchronization signal block (SSB, Synchronization Signal Block) transmitted by the base station to synchronize the terminal with the cell of the above base station, obtain the physical layer cell ID, and obtain system information.

[0071] Figure 5 It is a diagram exemplarily showing the synchronization signal block in the radio access technology applicable to this embodiment.

[0072] Refer to Figure 5 , the SSB consists of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) that respectively occupy 1 symbol and 127 subcarriers, and a PBCH that spans 3 OFDM symbols and 240 subcarriers.

[0073] The terminal receives the SSB by monitoring the SSB in the time domain and frequency domain.

[0074] SSB can be transmitted up to 64 times within 5ms. Most SSBs are transmitted using different beams within that 5ms period. If a terminal uses a specific beam for transmission as a reference, it is assumed that an SSB is transmitted and detected once every 20ms. The number of beams available for SSB transmission within 5ms increases with frequency. For example, in bands below 3GHz, up to 4 SSB beams can be transmitted, in bands between 3GHz and 6GHz, up to 8 beams can be used, and in bands above 6GHz, up to 64 different beams can be used for SSB transmission.

[0075] SSB includes two in one slot, and the starting symbol and the number of repetitions in the slot are determined as follows according to the subcarrier spacing.

[0076] On the other hand, unlike the existing LTE SS, SSB is not transmitted at the center frequency of the carrier bandwidth. That is, SSB can be transmitted in a place other than the center of the system frequency band, and when broadband operation is supported, multiple SSBs can be transmitted in the frequency domain. As a result, the terminal uses the synchronization raster as a candidate frequency position for monitoring SSB to monitor SSB. In NR, the carrier raster and the synchronization raster are redefined as the center frequency position of the channel for initial access, and the frequency interval of the synchronization raster is set to be wider than that of the carrier raster, so that the terminal can support fast SSB search.

[0077] The terminal can obtain the MIB (Master Information Block) through the PBCH of the SSB. The MIB (Master Information Block) includes the minimum information of the remaining minimum system information (RMSI) broadcast by the terminal for receiving the network. In addition, the PBCH may include: position information of the first DM-RS symbol in the time domain, information used by the terminal to monitor SIB1 (for example, SIB1 parameter set information, information related to SIB1 CORESET, search space information, and PDCCH-related parameter information, etc.), offset information between the common resource block and the SSB (the absolute position of the SSB in the carrier is transmitted through SIB1), etc. Among them, the SIB1 parameter set information is also applicable to some messages used in the random access process for accessing the base station after the terminal completes the cell search process. For example, the parameter set information of SIB1 can be applicable to at least one of messages 1 to 4 used for the random access process.

[0078] The above-mentioned RMSI may mean SIB1 (System Information Block 1), which is broadcast periodically (for example, 160ms) in the cell. SIB1 includes the information required for the terminal to perform the initial random access procedure and is periodically transmitted through PDSCH. In order to receive SIB1, the terminal needs to receive the parameter set information for SIB1 transmission and the control resource set (Control Resource Set, CORESET) information for SIB1 scheduling through PBCH. The terminal uses SI-RNTI in CORESET to confirm the scheduling information for SIB1 and obtains SIB1 on PDSCH according to the scheduling information. Other SIBs besides SIB1 can be transmitted periodically or according to the requirements of the terminal.

[0079] Figure 6 This is a diagram for explaining a random access procedure in a wireless access technology to which this embodiment is applicable.

[0080] Reference Figure 6 Upon completing the cell search, the terminal transmits a random access preamble (RAP) to the base station for random access. The RAP is transmitted via the PRACH. Specifically, the RAP is transmitted to the base station via the PRACH, which consists of continuous radio resources in a periodically repeated specific time slot. Typically, when a terminal initially accesses a cell, a contention-based random access procedure is performed. When performing random access for beam failure recovery (BFR), a non-contention-based random access procedure is performed.

[0081] 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 uplink grant (UL Grant) (uplink radio resources), a temporary C-RNTI (Temporary Cell-Radio Network Temporary Identifier), and a time alignment command (TAC). Since a random access response may include random access response information for more than one terminal, a random access preamble identifier may be included to notify 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., a random access radio network temporary identifier (RA-RNTI).

[0082] The terminal that receives a valid random access response processes the information included in the random access response and performs a transmission scheduled to the base station. For example, the terminal applies the TAC and stores the temporary C-RNTI. In addition, data stored in the terminal buffer or newly generated data is transmitted to the base station using the UL Grant. In this case, information capable of identifying the terminal should be included.

[0083] Finally, the terminal receives a downlink message for contention resolution.

[0084] <CORESET in NR>

[0085] The downlink control channel in NR is transmitted by a CORESET (Control Resource Set) with a length of 1 to 3 symbols, and transmits uplink / downlink scheduling information and a slot format index (SFI), transmit power control (TPC) information, etc.

[0086] As mentioned above, NR introduces the concept of a CORESET to ensure system flexibility. A CORESET (Control Resource Set) refers to the time-frequency resources used for downlink control signals. Terminals can use more than one search space within the CORESET time-frequency resources to decode control channel candidates. A QCL (QuasiCoLocation) assumption is set for each CORESET. This assumption not only provides characteristics based on existing QCL assumptions (delay spread, Doppler spread, Doppler shift, and average delay), but also provides characteristics for simulated beam direction.

[0087] Figure 7 This is a diagram for explaining CORESET.

[0088] Reference Figure 7 ,CORESET can exist in various forms within the carrier bandwidth within a time slot.,In the time domain, a CORESET can consist of up to 3 OFDM symbols.,Also, in the frequency domain, a CORESET is defined as a multiple of 6 resource blocks,up to the carrier bandwidth.

[0089] The first CORESET is part of the initial bandwidth component and is indicated by the MIB to receive additional configuration information and system information from the network. After establishing a connection with the base station, the terminal can receive and configure more than one CORESET information through RRC signaling.

[0090] Wider bandwidth operations

[0091] For existing LTE systems, scalable bandwidth operation is supported for any LTC CC (Component Carrier). That is, depending on the frequency deployment scenario, any LTE operator can configure a bandwidth ranging from a minimum of 1.4MHz to a maximum of 20MHz when configuring an LTE CC. For a single LTE CC, a normal LTE terminal can support transmit / receive capabilities up to 20MHz bandwidth.

[0092] However, NR is designed to support NR terminals with different transmit / receive bandwidth capabilities through a single wideband NR CC. Consequently, for any NR CC, one or more bandwidth parts (BWPs) consisting of segmented bandwidths are configured, and different BWP configurations and activations are performed for each terminal to support flexible, wider bandwidth operation.

[0093] Specifically, in NR, one or more bandwidth parts can be configured by a serving cell configured from the perspective of the terminal, and the terminal is defined as being used for uplink / downlink data transmission / reception by activating a downlink bandwidth part (DL bandwidth part) and an uplink bandwidth part (UL bandwidth part) in the serving cell. In addition, when multiple serving cells are set in the terminal, in other words, a terminal to which CA is applied is also defined as being used for uplink / downlink data transmission / reception using the radio resources of the serving cell by activating a downlink bandwidth part and / or an uplink bandwidth part for each serving cell.

[0094] Specifically, an initial bandwidth part for an initial access procedure of a terminal is defined in any serving cell, one or more UE-specific bandwidth parts ((multiple) bandwidth parts) are constructed for each terminal through dedicated RRC signaling, and a default bandwidth part (default bandwidth part) for a fallback operation may be defined for each terminal.

[0095] However, in any serving cell, multiple downlink and / or uplink bandwidth parts can be defined as activated and used simultaneously according to the terminal's capability and bandwidth part (multiple) bandwidth part configuration, but in NRrel-15, only one downlink bandwidth part (DL bandwidth part) and one uplink bandwidth part (UL bandwidth part) are defined as activated and used at any time in any terminal.

[0096] In this specification, frequency, frame, subframe, resource, resource block, region, frequency band, subband, control channel, data channel, synchronization signal, various reference signals, various signals, or various messages related to NR (New Radio) may be interpreted as having a meaning used in the past or present or having multiple meanings used in the future.

[0097] Hereinafter, a method for a terminal to perform uplink transmission and downlink reception in full-duplex communication will be described in detail with reference to relevant drawings.

[0098] Figure 8 FIG8 is a diagram illustrating a process 800 of a terminal performing uplink transmission and downlink reception according to one embodiment.

[0099] Reference Figure 8 , the terminal may receive configuration information of downlink time slots and downlink symbols and uplink time slots and uplink symbols S810.

[0100] TDD (Time Division Duplex) is a method of using time-division radio resources by dividing them into downlink time slots and uplink time slots. A terminal can receive TDD configuration information from a base station to determine the symbol format. In this case, the TDD configuration information can include configuration information related to the time slot format and configuration information for determining the format of symbols within the time slot. This information can be received via upper layer signaling or physical layer (L1) signaling.

[0101] The terminal may receive TDD configuration information for uplink-downlink (UL-DL) time slot settings from the base station. In this case, the time slot settings may be configured on a cell-by-cell basis via higher-layer signaling, such as cell-specific RRC signaling. Specifically, the RRC message for the UL-DL time slot settings may be used to set downlink symbols of a certain period, uplink symbols, and flexible symbols with undetermined transmission directions.

[0102] In addition, the terminal can receive terminal-specific RRC signaling, which reallocates flexible symbols among the symbols set by cell-specific RRC signaling into uplink symbols, downlink symbols, and flexible symbols for each terminal.

[0103] Alternatively, the terminal may also receive a dynamic slot format indication via a UE-group common PDCCH. According to an example, the terminal may dynamically receive the slot format indication via DCI format 2_0.

[0104] Refer again Figure 8 The terminal may receive configuration information of a subband for full-duplex communication and configuration information of a subband full-duplex (SBFD) time slot or SBFD symbol S820.

[0105] Full-duplex communication is a technology that simultaneously performs downlink transmission and uplink reception at the base station using the same radio resources. Downlink reception and uplink transmission can also be performed simultaneously on the terminal side. When the base station supports full-duplex communication based on subband non-overlapping, specific frequency resources within the same symbol in the TDD carrier can be used for downlink transmission, while other frequency resources can be used for uplink reception. That is, as described above, in order to support a transmission direction different from the set uplink, downlink or flexible transmission direction for the terminal, a subband can be set.

[0106] That is, within a TDD carrier, some frequency resources in any downlink time slot or downlink symbol can be configured as uplink transmission for the terminal or used as flexible symbols for downlink / uplink conversion (transition). Alternatively, some frequency resources in any uplink time slot or uplink symbol can be configured as downlink transmission for the base station. For example, when an uplink subband is set in any downlink time slot, the uplink subband can be set at the center of the frequency band (center) or at the edge of the frequency band (edge). In this case, a guard band can be set between the uplink subband and the downlink subband in the time slot. The terminal can receive configuration information of the subband for full-duplex communication from the base station.

[0107] As described above, a downlink time slot or symbol including an uplink subband, and an uplink time slot or symbol including a downlink subband are referred to as a subband full-duplex (SBFD) time slot or SBFD symbol in this disclosure. However, the term SBFD is for convenience of explanation and does not limit the scope of this disclosure. Other terms may be used as needed.

[0108] The terminal may receive information including downlink time slots or symbols of uplink subbands, and information including uplink time slots or symbols of downlink subbands, i.e., information regarding the configuration of SBFD time slots or SBFD symbols as time resource information. In other words, the terminal may receive information regarding the configuration of uplink subband time slots or symbols from downlink time slots or symbols allocated to the terminal. Alternatively, the terminal may receive information regarding the configuration of downlink subband time slots or symbols from uplink time slots or symbols allocated to the terminal.

[0109] Refer again Figure 8 , the terminal may perform uplink transmission or downlink reception based on the transmission direction link configuration information in the SBFD time slot or SBFD symbol S830.

[0110] In an SBFD time slot or SBFD symbol, a terminal can perform uplink transmission using an uplink subband or perform downlink reception using a downlink subband. Thus, the terminal can obtain transmission direction link configuration information regarding which operation to perform in uplink transmission or downlink reception in an SBFD time slot or SBFD symbol.

[0111] According to an example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be set via cell-specific upper layer signaling or terminal-specific upper layer signaling. As described above, in addition to the RRC signaling for setting uplink time slots and downlink time slots in the existing TDD system, the transmission direction link configuration information for setting uplink or downlink for the SBFD time slot or symbol can also be configured. In this case, the terminal can receive the transmission direction link configuration information via cell-specific RRC signaling or terminal-specific RRC signaling.

[0112] Specifically, the terminal may receive an SBFD time slot configuration message from the base station, in which the SBFD time slot configuration message is set to SBFD-DL, SBFD-UL, or SBFD-flexible for all symbols contained in the SBFD time slot or SBFD symbols. SBFD-DL refers to downlink reception being performed in the SBFD time slot or SBFD symbol. Similarly, SBFD-UL refers to uplink transmission being performed in the SBFD time slot or SBFD symbol, while SBFD-flexible refers to both downlink reception and uplink transmission being performed in the SBFD time slot or SBFD symbol.

[0113] The transmission direction link configuration information can be received via separate cell-specific RRC signaling or terminal-specific RRC signaling. Alternatively, the transmission direction link configuration information can be received in an RRC message that includes the above-mentioned subband configuration information for full-duplex communication. Alternatively, the above-mentioned RRC message for uplink-downlink time slot configuration can further include an information area for configuring SBFD-UL, SBFD-DL, or SBFD-flexible for SBFD time slots or SBFD symbols.

[0114] That is, when a terminal receives, through a base station, link configuration information indicating that the transmission direction is SBFD-DL in an SBFD time slot or SBFD symbol, the terminal may perform a downlink reception operation using a downlink subband in the SBFD time slot or SBFD symbol. In this case, the terminal may further perform a downlink reception operation using a guard band or uplink subband in the SBFD time slot or symbol.

[0115] Similarly, when a terminal receives, through a base station, transmission direction link configuration information set to SBFD-UL in an SBFD time slot or SBFD symbol, the terminal can perform uplink transmission operations using the uplink subband in that SBFD time slot or SBFD symbol. Alternatively, when a terminal receives, through a base station, transmission direction link configuration information set to SBFD-flexible in an SBFD time slot or SBFD symbol, the terminal can perform the same operations as in existing flexible symbols in that SBFD time slot or SBFD symbol. That is, the terminal can use the SBFD-flexible symbol as a guard symbol for switching between downlink reception and uplink transmission, or for implementing uplink transmission or downlink reception based on L1 control signaling from the base station.

[0116] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be indicated by physical layer (L1) control signaling for indicating the SBFD symbol-specific time slot format. The terminal can dynamically receive an indication of the SBFD time slot format (slot format) of the SBFD time slot or SBFD symbol from the base station through L1 control signaling. That is, the base station can transmit downlink control information (DCI) to the terminal, and the DCI is used to indicate SBFD-DL, SBFD-UL or SBFD-flexible for the SBFD time slot or SBFD symbol. Alternatively, the indication of the SBFD time slot format can be defined as that in the SBFD symbol, the base station performs the indication through upper layer signaling with the time slot consisting of SBFD-flexible symbols that are not set as SBFD-DL or SBFD-UL as the object. In this case, a separate DCI format can be set to indicate the SBFD time slot format.

[0117] This DCI format is based on the periodicity of the uplink or downlink subband configuration, and may include slot-based or symbol-based SBFD-DL, SBFD-UL, or SBFD-flexible indication information for SBFD slots or symbols within that period. For example, the DCI format indicating the SBFD slot format is transmitted by the base station in units of the subband configuration period and can be monitored by the terminal. In this case, the DCI format may indicate SBFD-DL, SBFD-UL, or SBFD-flexible for all SBFD slots within that period and for all symbols or SBFD symbols comprising that SBFD slot.

[0118] Alternatively, the base station may set a monitoring period for a separate SBFD slot format indicator DCI, regardless of the period for setting the subband for SBFD operation. In this case, SBFD-DL, SBFD-UL, and SBFD-flexible indication information may also be transmitted for all SBFD slots or SBFD symbols within the separately set period.

[0119] As described above, to indicate the SBFD slot format via DCI, an SBFD slot format table may be configured that includes SBFD-DL, SBFD-UL, or SBFD-flexible configuration information for the 14 symbol units that make up one SBFD slot. In this case, SBFD-DL, SBFD-UL, or SBFD-flexible information may be set for each index in the table, and the index in the table may be indicated via the DCI format.

[0120] Alternatively, the SBFD-DL, SBFD-UL or SBFD-flexible indication information may be directly transmitted in a symbol unit within the SBFD time slot via a DCI format used to indicate the SBFD time slot format.

[0121] Alternatively, the slot format indication information in an SBFD slot can be transmitted using the existing DCI format 2_0, which is used to indicate the slot format, without defining a separate DCI format for indicating the SBFD slot format. That is, when the base station indicates the slot format in an SBFD slot using DCI format 2_0 in the same manner as in the existing method, the terminal can determine whether to perform downlink reception or uplink transmission in that SBFD slot. In other words, for any SBFD slot, the symbols indicated as DL, UL, and flexible using DCI format 2_0 can be interpreted as SBFD-DL, SBFD-UL, and SBFD-flexible, respectively.

[0122] When a terminal receives an indication from a base station of link configuration information indicating that the transmission direction is set to SBFD-DL in an SBFD time slot or SBFD symbol, the terminal may perform a downlink reception operation using the downlink subband in the SBFD time slot or SBFD symbol. In this case, the terminal may further perform a downlink reception operation using the guard band or uplink subband in the SBFD time slot or symbol.

[0123] Similarly, when a terminal receives an indication from a base station of transmission direction link configuration information indicating that the transmission direction is set to SBFD-UL in an SBFD time slot or SBFD symbol, the terminal may perform an uplink transmission operation using the uplink subband in that SBFD time slot or SBFD symbol. Alternatively, when a terminal receives from a base station transmission direction link configuration information indicating that the transmission direction is set to SBFD-flexible in an SBFD time slot or SBFD symbol, the terminal may perform the same operation as in an existing flexible symbol in that SBFD time slot or SBFD symbol.

[0124] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol may be determined based on scheduling control information including downlink assignment control information or uplink grant control information.

[0125] In this case, the terminal can determine downlink reception or uplink transmission operation in SBFD time slots or SBFD symbols based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information such as CSI-RS and SRS from the base station. That is, for all SBFD time slots or SBFD symbols, the terminal defines flexible symbol operation as the baseline operation and performs downlink reception or uplink transmission based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information from the base station.

[0126] According to an example, different transmission directions may be set in an SBFD time slot or SBFD symbol based on higher-layer signaling and scheduling control information. That is, for at least one SBFD symbol, when a conflict occurs between transmission direction link configuration information set according to higher-layer signaling and transmission direction link configuration information indicated according to physical layer (L1) control signaling, the terminal may perform uplink transmission or downlink reception based on the transmission direction link configuration information indicated according to the physical layer (L1) control signaling.

[0127] That is, the terminal can be configured to perform uplink transmission or downlink reception based on a priority determined according to the signaling method. For example, it can be configured so that L1 control signaling transmitted via PDCCH takes precedence over RRC signaling set via PDSCH. Or, conversely, it can be configured so that RRC signaling set via PDSCH takes precedence over L1 control signaling transmitted via PDCCH.

[0128] Alternatively, the terminal may be configured to perform uplink transmission or downlink reception based on a priority determined according to the time of the setting / indication. For example, it may be configured to prioritize the most recently implemented setting / indication.

[0129] Thus, a method and apparatus for efficiently performing uplink and downlink transmission / reception in time slots or symbols applicable to full-duplex communication can be provided.

[0130] Figure 9 900 is a diagram showing a process 900 of a base station performing uplink reception and downlink transmission according to one embodiment. Figure 8 In the above description, in this case, as long as it does not conflict with the technical idea of the invention, the omitted content can be substantially applied to the base station.

[0131] Reference Figure 9 , the base station may transmit configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols S910.

[0132] The base station can transmit TDD configuration information for uplink-downlink time slot configuration to the terminal. In this case, the time slot configuration can be configured on a cell-by-cell basis through higher-layer signaling, such as cell-specific RRC signaling. That is, the RRC message for the UL-DL time slot configuration can be used to configure downlink symbols of a certain period, uplink symbols, and flexible symbols with undetermined transmission direction.

[0133] In addition, the base station can transmit terminal-specific RRC signaling, which reallocates flexible symbols among the symbols set by cell-specific RRC signaling into uplink symbols, downlink symbols, and flexible symbols for each terminal.

[0134] Alternatively, the base station may also indicate a dynamic slot format to the terminal via a UE-group common PDCCH. According to an example, the base station may dynamically indicate the slot format via DCI format 2_0.

[0135] Refer again Figure 9 The base station may transmit configuration information of a subband for full-duplex communication and configuration information of a subband full-duplex (SBFD) time slot or SBFD symbol S920.

[0136] In a TDD carrier, part of the frequency resources in any downlink time slot or downlink symbol can be configured as uplink transmission for the terminal or used as flexible symbols for downlink / uplink conversion (transition). Alternatively, part of the frequency resources in any uplink time slot or uplink symbol can be configured as downlink transmission for the base station. For example, when an uplink subband is set in any downlink time slot, the uplink subband can be set at the center of the frequency band (center) or at the edge of the frequency band (edge). In this case, a guard band can be set between the uplink subband and the downlink subband in the time slot. The base station can transmit configuration information of the subband for full-duplex communication to the terminal.

[0137] The base station can transmit information including downlink time slots or symbols of uplink subbands, and information including uplink time slots or symbols of downlink subbands, i.e., configuration information of SBFD time slots or SBFD symbols as time resource information. In other words, the base station can transmit information configuring uplink subband time slots or symbols from downlink time slots or symbols allocated to the terminal. Alternatively, the base station can transmit information configuring downlink subband time slots or symbols from uplink time slots or symbols allocated to the terminal.

[0138] Refer again Figure 9 , the base station may perform uplink reception or downlink transmission based on the transmission direction link configuration information in the SBFD time slot or SBFD symbol S930.

[0139] In an SBFD time slot or SBFD symbol, the base station can perform uplink reception using an uplink subband or downlink transmission using a downlink subband. Thus, the terminal can obtain transmission direction link configuration information regarding which operation to perform in uplink transmission or downlink reception in the SBFD time slot or SBFD symbol.

[0140] According to an example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be set via cell-specific upper layer signaling or terminal-specific upper layer signaling. As described above, in addition to the RRC signaling for setting uplink time slots and downlink time slots in the existing TDD system, the transmission direction link configuration information for setting uplink or downlink for the SBFD time slot or symbol can also be configured. In this case, the base station can transmit the transmission direction link configuration information via cell-specific RRC signaling or terminal-specific RRC signaling.

[0141] Specifically, the base station may transmit an SBFD time slot configuration message to the terminal, where the SBFD time slot configuration message is set to SBFD-DL, SBFD-UL or SBFD-flexible for all symbols or SBFD symbols included in the SBFD time slot.

[0142] The transmission direction link configuration information can be transmitted via separate cell-specific RRC signaling or terminal-specific RRC signaling. Alternatively, the transmission direction link configuration information can be transmitted in an RRC message that includes the above-mentioned subband configuration information for full-duplex communication. Alternatively, the above-mentioned RRC message for uplink-downlink time slot configuration can further include an information area for configuring SBFD-UL, SBFD-DL, or SBFD-flexible for SBFD time slots or SBFD symbols.

[0143] That is, when transmitting link configuration information with the transmission direction set to SBFD-DL in an SBFD time slot or SBFD symbol, the base station can perform downlink transmission operations using the downlink subband in the SBFD time slot or SBFD symbol. In this case, the base station can also further perform downlink transmission operations using the guard band or uplink subband in the SBFD time slot or symbol.

[0144] Similarly, when transmitting link configuration information with the transmission direction set to SBFD-UL in an SBFD time slot or SBFD symbol, the base station can perform uplink reception operations using the uplink subband in that SBFD time slot or SBFD symbol. Alternatively, when transmitting link configuration information with the transmission direction set to SBFD-flexible in an SBFD time slot or SBFD symbol, the base station can perform the same operations as in existing flexible symbols in that SBFD time slot or SBFD symbol. That is, the terminal can use this SBFD-flexible symbol as a guard symbol for switching between downlink reception and uplink transmission, or for implementing uplink transmission or downlink reception based on L1 control signaling from the base station.

[0145] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be indicated by physical layer (L1) control signaling for indicating the SBFD symbol-specific time slot format. The base station can dynamically indicate the SBFD time slot format (slot format) for the SBFD time slot or SBFD symbol to the terminal through L1 control signaling. That is, the base station can transmit downlink control information (DCI) to the terminal, and the DCI is used to indicate SBFD-DL, SBFD-UL or SBFD-flexible for the SBFD time slot or SBFD symbol. Alternatively, the indication of the SBFD time slot format can be defined as that in the SBFD symbol, the base station performs the indication through upper layer signaling with the time slot consisting of SBFD-flexible symbols that are not set as SBFD-DL or SBFD-UL as the object. In this case, a separate DCI format can be set to indicate the SBFD time slot format.

[0146] This DCI format is based on the periodicity of the uplink or downlink subband configuration, and may include slot-based or symbol-based SBFD-DL, SBFD-UL, or SBFD-flexible indication information for SBFD slots or symbols within that period. For example, the DCI format indicating the SBFD slot format is transmitted by the base station in units of the subband configuration period and can be monitored by the terminal. In this case, the DCI format may indicate SBFD-DL, SBFD-UL, or SBFD-flexible for all SBFD slots within that period and for all symbols or SBFD symbols comprising that SBFD slot.

[0147] Alternatively, the base station may set a monitoring period for a separate SBFD slot format indicator DCI, regardless of the period for setting the subband for SBFD operation. In this case, SBFD-DL, SBFD-UL, and SBFD-flexible indication information may also be transmitted for all SBFD slots or SBFD symbols within the separately set period.

[0148] As described above, to indicate the SBFD slot format via DCI, an SBFD slot format table may be configured that includes SBFD-DL, SBFD-UL, or SBFD-flexible configuration information for the 14 symbol units that make up one SBFD slot. In this case, SBFD-DL, SBFD-UL, or SBFD-flexible information may be set for each index in the table, and the index in the table may be indicated via the DCI format.

[0149] Alternatively, the SBFD-DL, SBFD-UL or SBFD-flexible indication information may be directly transmitted in a symbol unit within the SBFD time slot via a DCI format used to indicate the SBFD time slot format.

[0150] Alternatively, the slot format indication information in an SBFD slot can be transmitted using the existing DCI format 2_0, which is used to indicate the slot format, without defining a separate DCI format for indicating the SBFD slot format. That is, when the base station indicates the slot format in an SBFD slot using DCI format 2_0 in the same manner as in the existing method, the terminal can determine whether to perform downlink reception or uplink transmission in that SBFD slot. In other words, for any SBFD slot, the symbols indicated as DL, UL, and flexible using DCI format 2_0 can be interpreted as SBFD-DL, SBFD-UL, and SBFD-flexible, respectively.

[0151] When the base station indicates that the transmission direction link configuration information is set to SBFD-DL in an SBFD time slot or SBFD symbol, the base station may perform a downlink transmission operation using the downlink subband in the SBFD time slot or SBFD symbol. In this case, the base station may further perform a downlink transmission operation using the guard band or uplink subband in the SBFD time slot or symbol.

[0152] Similarly, when the base station indicates that the transmission direction link configuration information is set to SBFD-UL in an SBFD time slot or SBFD symbol, the base station can perform an uplink reception operation using the uplink subband in that SBFD time slot or SBFD symbol. Alternatively, when the base station transmits the transmission direction link configuration information set to SBFD-flexible in an SBFD time slot or SBFD symbol, the base station can perform the same operation as in an existing flexible symbol in that SBFD time slot or SBFD symbol.

[0153] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol may be determined based on scheduling control information including downlink assignment control information or uplink grant control information.

[0154] In this case, the terminal can determine downlink reception or uplink transmission operation in SBFD time slots or SBFD symbols based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information such as CSI-RS and SRS from the base station. That is, for all SBFD time slots or SBFD symbols, the terminal defines flexible symbol operation as the baseline operation and performs downlink reception or uplink transmission based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information from the base station.

[0155] According to an example, different transmission directions may be set in an SBFD time slot or SBFD symbol based on higher-layer signaling and scheduling control information. That is, for at least one SBFD symbol, when a conflict occurs between transmission direction link configuration information set according to higher-layer signaling and transmission direction link configuration information indicated according to physical layer (L1) control signaling, the base station may perform uplink reception or downlink transmission based on the transmission direction link configuration information indicated according to the physical layer (L1) control signaling.

[0156] That is, the base station can be configured to perform uplink reception or downlink transmission based on a priority determined by the signaling method. For example, it can be configured so that L1 control signaling transmitted via the PDCCH takes precedence over RRC signaling set via the PDSCH. Or, conversely, it can be configured so that RRC signaling set via the PDSCH takes precedence over L1 control signaling transmitted via the PDCCH.

[0157] Alternatively, the base station may be configured to perform uplink reception or downlink transmission based on a priority determined according to the timing of the setting / instruction. For example, the most recently implemented setting / instruction may be prioritized.

[0158] Thus, a method and apparatus for efficiently performing uplink and downlink transmission / reception in time slots or symbols applicable to full-duplex communication can be provided.

[0159] Hereinafter, a method for transmitting / receiving a downlink control channel in full-duplex communication and related embodiments will be described in detail with reference to relevant drawings.

[0160] The present disclosure proposes a method for setting downlink control channel transmission / reception resources for a terminal in an arbitrary base station / cell, wherein an uplink subband (UL subband) or a downlink subband (DL subband) for supporting full-duplex (Full Duplex) communication in a wireless mobile communication system is set in the arbitrary base station / cell.

[0161] TDD (Time Division Duplex) is a duplexing method widely used in commercial NR (New Radio), or 5G mobile communication systems. In TDD, time slots are divided into downlink and uplink time slots. Typically, downlink time slots are allocated more frequently than uplink time slots, based on the distribution ratio of uplink to downlink traffic. However, this limitation in uplink time slots has a negative impact on coverage and latency. Full-duplex communication can be used to address these issues.

[0162] Full-duplex communication specifically refers to a technology in which the gNB, i.e., the base station, simultaneously performs DL transmission and UL reception using the same radio resources. Simultaneous DL reception and UL transmission can also be performed on 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 designed to facilitate self-interference cancellation, the DL reception performance of the terminal is susceptible to self-interference from the UL transmission signal. Therefore, it is generally considered that the base station operates with full duplex communication and the terminal operates with half duplex communication. In addition, to reduce the impact of self-interference, the base station also performs DL transmission and UL reception simultaneously, but the main consideration is subband non-overlapping full duplex communication, so that frequency resources that are not the same between DL / UL are distinguished and transmitted and received.

[0163] That is, in Figure 10 and Figure 11 , an example is shown in which DL time slots and UL time slots in any NR frequency band are composed in a ratio of 4:1. However, part of the symbols of the last DL time slot may be a special time slot containing flexible symbols for DL / UL transition. As described above, when a TDD (Time Division Duplex) configuration is formed, an uplink subband (UL subband) for supporting UL transmission of a terminal may be set in part (or all) of the DL time slots in the DL time slot. When a UL subband is set in any DL time slot, as shown in FIG. Figure 10 As shown, the UL subband can be set at the center of the frequency band, or as shown in Figure 11 As shown, it can be set at the edge of the frequency band. In this case, a guard band can be set between the UL subband and the downlink subband (DL subband) in the time slot.

[0164] The present disclosure proposes a method for transmitting / receiving uplink / downlink wireless signals (DM-RS, CSI-RS, SRS, PSS / SSS, etc.) and wireless channels (e.g., PDCCH / PDSCH and PUSCH / PUCCH, etc.) of the base station and terminal according to its BWP setting when subband non-overlapping full duplex is supported in any base station / network. However, the content described in the present disclosure can be substantially the same and applied to various other full-duplex application scenarios. For example, the full-duplex application scenario may include full-duplex operation in an unpaired spectrum and full-duplex operation in a downlink (DL) band or uplink (UL) band of a paired spectrum. In addition, as described above, only subband non-overlapping full duplex or pure full duplex (i.e., DL transmission and UL reception are performed simultaneously on the same frequency resources) is supported on the base station side, and in the terminal, the content of the present disclosure can also be substantially applied to the scenario of performing half duplex operation. In addition, not only in the base station, but also in the terminal, when subband non-overlapping full duplex or pure full duplex is supported, the content of the present disclosure can also be substantially applied.

[0165] The uplink-downlink (UL-DL) slot setting defined in NR is defined as being formed by cell units through cell-specific RRC signaling. That is, a pattern of DL symbols, UL symbols and flexible symbols of a certain period is set by the RRC message "tdd-UL-DL-ConfigurationCommon" used for the UL-DL slot configuration. In addition, through "tdd-UL-DL-ConfigurationDedicated" as terminal-specific (UE-specific) RRC signaling, only the flexible symbols set by the above-mentioned "tdd-UL-DL-ConfigurationCommon" can be reallocated as UL symbols, DL symbols or flexible symbols for each terminal. Alternatively, a method for indicating a dynamic slot format through a terminal group common (UE-group common) PDCCH is also defined. For this reason, NR also supports a slot format indication method in a dynamic form through DCI format 2_0.

[0166] According to the above slot configuration method, any symbol can be set or indicated as one of DL, UL or Flexible. Figure 10 This is an example of setting the format of any time slot to DDDSU through the existing slot configuration. D is a downlink time slot, which means that all OFDM symbols constituting the time slot are set to DL. U is an uplink time slot, which means that all OFDM symbols constituting the time slot are set to UL. S is a special time slot, which refers to a time slot including flexible symbols for DL / UL transition. Typically, in the case of a normal CP, the special slot can consist of 12 DL symbols and 2 flexible symbols out of a total of 14 symbols. Alternatively, it can consist of 10 DL symbols, 2 flexible symbols and 2 UL symbols. That is, within any TDD carrier, a symbol is only set or indicated as one of DL or UL or flexible.

[0167] However, if Figure 10 and Figure 11As shown, when a UL subband is set in any DL time slot, DL transmission or UL transmission can occur simultaneously on each frequency resource in that symbol. As described above, a DL time slot or symbol including a UL subband and a UL time slot or symbol including a DL subband are referred to as subband full-duplex (SBFD) time slots or SBFD symbols in this disclosure.

[0168] Specifically, as mentioned above Figure 10 and Figure 11 As shown in FIG, when a UL subband is set in any DL time slot, the base station side allocates the radio resources of the frequency band corresponding to the UL subband to realize the UL transmission of the terminal. Figure 10 and Figure 11 In the SBFD symbol, radio resources corresponding to the remaining frequency bands (i.e., DL subbands) other than the UL subband and guardband are allocated for UE downlink transmission. Conversely, UEs within the cell must define whether they will receive downlink signals from the base station using the DL subband during the SBFD symbol, or perform uplink transmissions to the base station using the UL subband.

[0169] This disclosure proposes a method for configuring DL / UL operations for any terminal in SBFD symbols. Specifically, it proposes a method for defining which of the following operations, UL transmission based on a UL subband or DL reception based on a DL subband, is performed for any terminal in an SBFD time slot or symbol. In other words, this disclosure proposes a method for configuring SBFD time slots for any terminal.

[0170] Example 1: Semi-static configuration method

[0171] When any time slot or symbol is set to be an SBFD time slot or symbol including a UL subband, a guardband (if necessary), and a DL subband, it is possible to define that the base station transmits to each terminal an upper layer signaling for setting the link direction (link direction) (for example, DL, UL, or flexible, etc.) of the terminal in the SBFD time slot or symbol. That is, in addition to the existing RRC message "tdd-UL-DL-ConfigurationCommon" for UL-DL slot configuration or "tdd-UL-DL-ConfigurationDedicated" as terminal-specific (UE-specific) RRC signaling, UL-DL configuration information for the SBFD time slot or symbol can be further set and transmitted to any terminal through UE-specific RRC signaling or UE-group common RRC signaling or cell-specific RRC signaling. For example, an RRC message such as “SBFD-UL-DL-configurationcommon” or “SBFD-UL-DL-configurationdedicated” (this is just an example, and the present invention is not limited to the RRC message name) may be further defined.

[0172] Specifically, the base station uses the SBFD slot configuration message for any terminal to configure SBFD-DL, SBFD-UL, or SBFD-flexible for all OFDM symbols or SBFD symbols included in any SBFD time slot and transmits the message to the terminal. Based on this, when any terminal receives the SBFD-DL configuration information from any SBFD time slot or symbol via the base station, the terminal performs a DL reception operation using the DL subband in that SBFD time slot or symbol, or expects a DL reception operation or defines a DL reception operation as a baseline. Alternatively, the terminal may further perform a DL reception operation using the guardband or UL subband.

[0173] Conversely, when any terminal receives SBFD-UL configuration information from a base station in any SBFD time slot or symbol, the terminal performs UL transmission operations using the UL subband in that SBFD time slot or symbol, or expects UL transmission operations or defines UL transmission operations as a baseline. When any terminal receives SBFD-flexible configuration information from a base station in any SBFD time slot or symbol, the terminal follows the operations in existing flexible symbols in that SBFD time slot or symbol.

[0174] However, the SBFD-slot configuration information may be transmitted via a separate cell-specific or UE-specific RRC message, such as the "SBFD-UL-DL-configurationcommon" or "SBFD-UL-DL-configurationdedicated" message, or may be defined as including the SBFD-slot configuration information together with the UL or DL subband configuration information in an RRC message for configuring the UL or DL subband used for SBFD operation. Alternatively, the information area for configuring the SBFD-UL, SBFD-DL, or SBFD-flexible for the SBFD time slot or symbol may be included in an existing UL-DL-configuration RRC message.

[0175] The following is an example of setting DL / UL or flexible in SBFD symbols for any of the above terminals through RRC signaling. The UL transmission, DL reception or flexible setting in SBFD symbols can be set for a continuous SBFD symbol pattern of a UL subband or DL subband or an additional flexible subband set for SBFD operation. For example, Figure 10 and Figure 11 As shown, when UL subband is set in continuous DL time slots, DL symbols of special slots mixed with DL symbols, flexible symbols and UL symbols, and flexible symbols, DL, UL and flexible symbols are set for the entire continuous SBFD symbol. As an example, Figure 12 As shown, for the entire SBFD symbol, the number from the first SBFD symbol to the DL reception symbol and the number from the last SBFD symbol to the UL transmission symbol can be set, and for the remaining SBFD symbols, it is set to operate with flexble symbols.

[0176] Example 2: Dynamic indication method

[0177] This can be defined as dynamically indicating the SBFD slot format for any SBFD slot or symbol via L1 control signaling at the base station. Specifically, this can be defined as transmitting DCI (Downlink Control Information) from the base station to the terminal to indicate SBFD-DL, SBFD-UL, or SBFD-flexible for any SBFD slot or symbol. For example, a separate DCI format can be defined to indicate this SBFD slot format.

[0178] The DCI format used to indicate the SBFD slot format can be defined as a periodicity set based on the UL subband or DL subband, and the SBFD time slots or symbols within the period include SBFD-DL, SBFD-UL or SBFD-flexible indication information in time slot units or symbol units. For example, the DCI format used to indicate the SBFD slot format can be defined as a periodicity set in the above-mentioned UL subband or DL subband, transmitted by the base station and monitored by the terminal, and can be defined as indicating SBFD-DL, SBFD-UL or SBFD-flexible for all symbols or SBFD symbols constituting the SBFD time slot for all SBFD time slots within the period. For example, when the UL subband is configured in 3 time slots out of 5 time slots, and the 3 time slots are set as SBFD time slots, the base station can transmit the DCI format used to indicate the SBFD slot format with the above-mentioned 5-slot period (or a multiple of 5 slots), and the terminal can monitor it. In this case, the SBFD slot format indication DCI can be defined as including SBFD-DL, SBFD-UL or SBFD-flexible setting indication information for all symbols or SBFD symbols constituting the three SBFD time slots within the cycle (when the SBFD slot format DCI is transmitted with a 5-time slot cycle). Alternatively, the above-mentioned SBFD slot format indication DCI can be set to apply only to the SBFD time slot consisting only of SBFD-flexible symbols in the SBFD time slot that are not set as SBFD-DL or SBFD-UL symbols by upper layer signaling according to the above-mentioned embodiment 1. Alternatively, it can be defined that, regardless of the setting period of the UL subband or DL subband used for the SBFD operation, the base station sets a separate SBFD slot format indication DCI monitoring period, and based on this, transmits SBFD-DL, SBFD-UL and SBFD-flexible indication information for all SBFD time slots or symbols within the cycle.

[0179] As described above, as a method for indicating the SBFD slot format through DCI, it can be defined as configuring an SBFD slot format table, which includes SBFD-DL, SBFD-UL, or SBFD-flexible setting information for 14 symbol units constituting one SBFD slot, and indicating an index within the table through a DCI format for indicating the SBFD slot format, or directly transmitting the SBFD-DL, SBFD-UL, or SBFD-flexible indication information through a DCI format for indicating the SBFD slot format and in symbol units within the SBFD slot. However, when configuring the table for indicating the SBFD slot format, a default table for it can be defined, or it can be defined as the base station setting the SBFD-DL, SBFD-UL, or SBFD-flexible indication information for each index constituting the table through RRC signaling.

[0180] Alternatively, rather than defining a separate DCI format for indicating the SBFD slot format, the slot format indication information in the SBFD timeslot may be transmitted / received using the existing DCI format 2_0 for indicating the slot format. Specifically, the base station may indicate the slot format in the SBFD timeslot using DCI format 2_0, similar to the existing method, and the terminal may determine whether to perform DL reception or UL transmission in the SBFD timeslot based on this information. Specifically, for any SBFD timeslot, the symbols indicated as DL, UL, and flexible using DCI format 2_0 are interpreted as the aforementioned SBFD-DL, SBFD-UL, and SBFD-flexible, respectively.

[0181] The base station and terminal operations in SBFD-DL, SBFD-UL, and SBFD-flexible as indicated in the second embodiment are the same as those in the first embodiment. Specifically, when any terminal receives SBFD-DL indication information from a base station in any SBFD time slot or symbol, the terminal performs a DL reception operation using a DL subband, or expects a DL reception operation, or defines a DL reception operation as a baseline, in that SBFD time slot or symbol. (Alternatively, a DL reception operation using a guardband or UL subband may be further performed.) Conversely, when any terminal receives SBFD-UL indication information from a base station in any SBFD time slot or symbol, the terminal performs a UL transmission operation using a UL subband, or expects a UL transmission operation, or defines a UL transmission operation as a baseline, in that SBFD time slot or symbol. When any terminal receives SBFD-flexible indication information from a base station in any SBFD time slot or symbol, the terminal follows the operations in existing flexible symbols in that SBFD time slot or symbol. That is, in the case of SBFD-flexible, DL reception through a DL subband (or further a guardband or a UL subband) and UL transmission through a UL subband can be achieved according to the setting or instruction of the additional base station.

[0182] Example 3: Implicit Indication

[0183] As shown in the above-mentioned embodiment 1 or embodiment 2, it can be defined as the base station not setting or indicating a separate link direction for the SBFD time slot or symbol of any terminal, but instead deriving the DL reception or UL transmission operation in any SBFD time slot or symbol of the terminal based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information such as CSI-RS and SRS of the base station. That is, for all SBFD time slots or symbols, the terminal can define the flexible symbol operation as the baseline operation and perform the DL reception or UL transmission operation based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information of the base station.

[0184] Alternatively, for any terminal, when a subband for supporting the reverse link direction, i.e., for supporting SBFD operation, is set in the DL / UL time slot or symbol set or indicated by the existing slot format configuration, i.e., the above-mentioned "tdd-UL-DL-ConfigurationCommon" or "tdd-UL-DL-ConfigurationDedicated" as UE-specific RRC signaling, and DCI format 2_0 (i.e., a UL subband set in a DL time slot or symbol, or a DL subband set in a UL time slot or symbol, or a UL or DL subband set in a flexible symbol, etc.), the reverse link operation through the subband can be defined as a baseline. That is, in any terminal, when a UL subband for SBFD operation is set in a time slot or symbol allocated or indicated as DL, the terminal can define the UL transmission operation in the SBFD time slot or symbol as a baseline.

[0185] Regarding the above-described Embodiments 1 to 3, 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 these embodiments are combined.

[0186] Hereinafter, the structure of the terminal and the base station will be described with reference to the accompanying drawings, wherein the terminal and the base station can perform reference Figures 1 to 12 In order to avoid duplication of description, the aforementioned description may be omitted. In this case, as long as it does not conflict with the technical concept of the invention, the omitted content can be substantially the same as that applied to the following description.

[0187] Figure 13 is a diagram showing a structure of a terminal 1300 according to another embodiment.

[0188] Reference Figure 13 According to another embodiment, a terminal 1300 includes a transmitting unit 1320 , a receiving unit 1330 , and a control unit 1310 for controlling operations of the transmitting unit and the receiving unit.

[0189] The control unit 1310 controls the operation of the entire terminal 1300 according to the uplink and downlink transmission / reception method in full-duplex communication required for executing the present invention.

[0190] The control unit 1310 may receive configuration information for downlink time slots and downlink symbols, and uplink time slots and uplink symbols. The control unit 1310 may receive TDD configuration information for uplink-downlink time slot settings from a base station. In this case, the time slot settings may be configured on a cell-by-cell basis via upper layer signaling, such as cell-specific RRC signaling. That is, downlink symbols of a certain period, uplink symbols, and flexible symbols with undetermined transmission directions may be set via an RRC message for the UL-DL time slot settings.

[0191] Furthermore, the control unit 1310 may receive terminal-specific RRC signaling that reallocates flexible symbols among the symbols set by the cell-specific RRC signaling into uplink symbols, downlink symbols, and flexible symbols for each terminal.

[0192] Alternatively, the control unit 1310 may also receive a dynamic slot format indication via a UE-group common PDCCH. According to an example, the terminal may dynamically receive the slot format indication via DCI format 2_0.

[0193] The control unit 1310 may receive configuration information of a subband for full-duplex communication and configuration information of a subband full-duplex (SBFD) time slot or SBFD symbol. Within a TDD carrier, some frequency resources in any downlink time slot or downlink symbol may be configured as uplink transmission for a terminal or used as a flexible symbol for downlink / uplink transition. Alternatively, some frequency resources in any uplink time slot or uplink symbol may be configured as downlink transmission for a base station. The control unit 1310 may receive configuration information of a subband for full-duplex communication from a base station.

[0194] The control unit 1310 may receive information including downlink time slots or symbols of uplink subbands and information including uplink time slots or symbols of downlink subbands, that is, configuration information of SBFD time slots or SBFD symbols as time resource information.

[0195] The control unit 1310 can perform uplink transmission or downlink reception based on the transmission direction link configuration information in the SBFD time slot or SBFD symbol. In the SBFD time slot or SBFD symbol, the control unit 1310 can perform uplink transmission using the uplink subband or perform downlink reception using the downlink subband. Thus, the control unit 1310 can obtain the transmission direction link configuration information regarding which operation to perform, uplink transmission or downlink reception, in the SBFD time slot or SBFD symbol.

[0196] According to an example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be set via cell-specific upper layer signaling or terminal-specific upper layer signaling. As described above, in addition to the RRC signaling for setting uplink time slots and downlink time slots in the existing TDD system, the transmission direction link configuration information for setting uplink or downlink for the SBFD time slot or symbol can also be configured. In this case, the control unit 1310 can receive the transmission direction link configuration information via cell-specific RRC signaling or terminal-specific RRC signaling.

[0197] The transmission direction link configuration information can be received via separate cell-specific RRC signaling or terminal-specific RRC signaling. Alternatively, the transmission direction link configuration information can be received in an RRC message that includes the above-mentioned subband configuration information for full-duplex communication. Alternatively, the above-mentioned RRC message for uplink-downlink time slot configuration can further include an information area for configuring SBFD-UL, SBFD-DL, or SBFD-flexible for SBFD time slots or SBFD symbols.

[0198] That is, when the control unit 1310 receives transmission direction link configuration information set to SBFD-DL in an SBFD time slot or SBFD symbol from the base station, it can perform downlink reception operations using the downlink subband in that SBFD time slot or SBFD symbol. Similarly, when the control unit 1310 receives transmission direction link configuration information set to SBFD-UL in an SBFD time slot or SBFD symbol from the base station, it can perform uplink transmission operations using the uplink subband in that SBFD time slot or SBFD symbol. Alternatively, when the control unit 1310 receives transmission direction link configuration information set to SBFD-flexible in an SBFD time slot or SBFD symbol from the base station, it can perform operations similar to those in existing flexible symbols in that SBFD time slot or SBFD symbol.

[0199] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be indicated by physical layer (L1) control signaling used to indicate the SBFD symbol-specific time slot format. The control unit 1310 can dynamically receive an indication of the SBFD time slot format (slot format) of the SBFD time slot or SBFD symbol from the base station through L1 control signaling. That is, the base station can transmit downlink control information (DCI) to the terminal. The DCI is used to indicate SBFD-DL, SBFD-UL, or SBFD-flexible for the SBFD time slot or SBFD symbol. In this case, a separate DCI format can be set to indicate the SBFD time slot format.

[0200] This DCI format is based on a setting period of an uplink subband or a downlink subband, and may include SBFD-DL, SBFD-UL or SBFD-flexible indication information in slot units or symbol units for SBFD time slots or symbols within the period.

[0201] Alternatively, the base station may set a monitoring period for a separate SBFD slot format indicator DCI, regardless of the period for setting the subband for SBFD operation. In this case, SBFD-DL, SBFD-UL, and SBFD-flexible indication information may also be transmitted for all SBFD slots or SBFD symbols within the separately set period.

[0202] Alternatively, the slot format indication information for an SBFD slot can be transmitted using the existing DCI format 2_0 for indicating the slot format, without defining a separate DCI format for indicating the SBFD slot format. That is, when the base station indicates the slot format for an SBFD slot using DCI format 2_0 in the same manner as in the existing method, the control unit 1310 can determine whether to perform downlink reception or uplink transmission in the SBFD slot.

[0203] When the control unit 1310 receives an indication from the base station that the transmission direction link configuration information is set to SBFD-DL in an SBFD time slot or SBFD symbol, a downlink reception operation using the downlink subband can be performed in that SBFD time slot or SBFD symbol. Similarly, when the control unit 1310 receives an indication from the base station that the transmission direction link configuration information is set to SBFD-UL in an SBFD time slot or SBFD symbol, an uplink transmission operation using the uplink subband can be performed in that SBFD time slot or SBFD symbol. Alternatively, when the control unit 1310 receives an indication from the base station that the transmission direction link configuration information is set to SBFD-flexible in an SBFD time slot or SBFD symbol, an operation similar to that performed in an existing flexible symbol can be performed in that SBFD time slot or SBFD symbol.

[0204] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol may be determined based on scheduling control information including downlink assignment control information or uplink grant control information.

[0205] In this case, the control unit 1310 can determine the downlink reception or uplink transmission operation in the SBFD time slot or SBFD symbol based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information such as CSI-RS and SRS from the base station. That is, for all SBFD time slots or SBFD symbols, the control unit 1310 defines the flexible symbol operation as the baseline operation and performs downlink reception or uplink transmission based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information from the base station.

[0206] According to an example, different transmission directions may be set in an SBFD time slot or SBFD symbol based on higher-layer signaling and scheduling control information. That is, for at least one SBFD symbol, when a conflict occurs between the transmission direction link configuration information set according to the higher-layer signaling and the transmission direction link configuration information indicated by the physical layer (L1) control signaling, the control unit 1310 may perform uplink transmission or downlink reception based on the transmission direction link configuration information indicated by the physical layer (L1) control signaling.

[0207] That is, the control unit 1310 can be configured to perform uplink transmission or downlink reception based on a priority determined according to the signaling method. For example, it can be configured so that L1 control signaling transmitted via the PDCCH takes precedence over RRC signaling set via the PDSCH. Or, conversely, it can be configured so that RRC signaling set via the PDSCH takes precedence over L1 control signaling transmitted via the PDCCH.

[0208] Alternatively, the control unit 1310 may be configured to perform uplink transmission or downlink reception based on a priority determined according to the timing of the setting / instruction. For example, the most recently implemented setting / instruction may be prioritized.

[0209] Thus, a method and apparatus for efficiently performing uplink and downlink transmission / reception in time slots or symbols applicable to full-duplex communication can be provided.

[0210] Figure 14 is a diagram showing the structure of a base station 1400 according to another embodiment.

[0211] Reference Figure 14 According to another embodiment, a base station 1400 includes a transmitting unit 1420 , a receiving unit 1430 , and a control unit 1410 for controlling operations of the transmitting unit and the receiving unit.

[0212] Control unit 1410 controls the overall operation of base station 1400, as required for implementing the above-described uplink and downlink transmission / reception method in full-duplex communication, as described above. Transmission unit 1420 transmits downlink control information, data, and messages to terminals via corresponding channels. Reception unit 1430 receives uplink control information, data, and messages from terminals via corresponding channels.

[0213] The control unit 1410 may transmit configuration information for downlink time slots and downlink symbols, and uplink time slots and uplink symbols. The control unit 1410 may transmit TDD configuration information for uplink-downlink time slot settings to the terminal. In this case, the time slot settings may be configured on a cell-by-cell basis through upper layer signaling, such as cell-specific RRC signaling. That is, downlink symbols of a certain period, uplink symbols, and flexible symbols with undetermined transmission directions may be set through the RRC message for the UL-DL time slot settings.

[0214] Furthermore, the control unit 1410 may transmit terminal-specific RRC signaling for reallocating flexible symbols among the symbols set by the cell-specific RRC signaling into uplink symbols, downlink symbols, and flexible symbols for each terminal.

[0215] Alternatively, the control unit 1410 may also indicate a dynamic slot format to the terminal via a UE-group common PDCCH. According to an example, the base station may dynamically indicate the slot format via DCI format 2_0.

[0216] The control unit 1410 may transmit configuration information for subbands used for full-duplex communication and configuration information for subband full-duplex (SBFD) time slots or SBFD symbols. The control unit 1410 may transmit information including downlink time slots or symbols of uplink subbands and information including uplink time slots or symbols of downlink subbands, i.e., configuration information for SBFD time slots or SBFD symbols as time resources. In other words, the control unit 1410 may transmit information for configuring time slots or symbols of uplink subbands from downlink time slots or symbols allocated to the terminal. Alternatively, the control unit 1410 may transmit information for configuring time slots or symbols of downlink subbands from uplink time slots or symbols allocated to the terminal.

[0217] Control unit 1410 can perform uplink reception or downlink transmission based on the transmission direction link configuration information in the SBFD time slot or SBFD symbol. In the SBFD time slot or SBFD symbol, control unit 1410 can perform uplink reception using the uplink subband or downlink transmission using the downlink subband. Thus, the terminal can obtain the transmission direction link configuration information regarding which operation to perform, uplink transmission or downlink reception, in the SBFD time slot or SBFD symbol.

[0218] According to an example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be set via cell-specific upper layer signaling or terminal-specific upper layer signaling. As described above, in addition to the RRC signaling for setting uplink time slots and downlink time slots in the existing TDD system, the transmission direction link configuration information for setting uplink or downlink for the SBFD time slot or symbol can also be configured. In this case, the control unit 1410 can transmit the transmission direction link configuration information via cell-specific RRC signaling or terminal-specific RRC signaling.

[0219] The transmission direction link configuration information can be transmitted via separate cell-specific RRC signaling or terminal-specific RRC signaling. Alternatively, the transmission direction link configuration information can be received in an RRC message that includes the above-mentioned subband configuration information for full-duplex communication. Alternatively, the above-mentioned RRC message for uplink-downlink time slot configuration can further include an information area for configuring SBFD-UL, SBFD-DL, or SBFD-flexible for SBFD time slots or SBFD symbols.

[0220] That is, when transmission direction link configuration information set to SBFD-DL is transmitted in an SBFD slot or SBFD symbol, the control unit 1410 can perform downlink transmission operations using the downlink subband in that SBFD slot or SBFD symbol. Similarly, when transmission direction link configuration information set to SBFD-UL is transmitted in an SBFD slot or SBFD symbol, the control unit 1410 can perform uplink reception operations using the uplink subband in that SBFD slot or SBFD symbol. Alternatively, when transmission direction link configuration information set to SBFD-flexible is transmitted in an SBFD slot or SBFD symbol, the control unit 1410 can perform operations similar to those in existing flexible symbols in that SBFD slot or SBFD symbol.

[0221] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol can be indicated by physical layer (L1) control signaling used to indicate the SBFD symbol-specific time slot format. The control unit 1410 can dynamically indicate the SBFD time slot format (slot format) for the SBFD time slot or SBFD symbol to the terminal through L1 control signaling. In other words, the control unit 1410 can transmit downlink control information (DCI) to the terminal. The DCI is used to indicate SBFD-DL, SBFD-UL, or SBFD-flexible for the SBFD time slot or SBFD symbol. In this case, a separate DCI format can be set to indicate the SBFD time slot format.

[0222] This DCI format is based on the uplink or downlink subband configuration period and may include slot-based or symbol-based SBFD-DL, SBFD-UL, or SBFD-flexible indication information for SBFD slots or symbols within that period. For example, the DCI format indicating the SBFD slot format is transmitted by the control unit 1410 in units of the subband configuration period and can be monitored by the terminal. In this case, the DCI format may indicate SBFD-DL, SBFD-UL, or SBFD-flexible for all SBFD slots within that period and for all symbols or SBFD symbols comprising that SBFD slot.

[0223] Alternatively, regardless of the period of setting the subband for SBFD operation, the monitoring period of the individual SBFD slot format indication DCI may be set by the control unit 1410. In this case, SBFD-DL, SBFD-UL, and SBFD-flexible indication information may be transmitted for all SBFD slots or SBFD symbols within the individually set period.

[0224] As described above, to indicate the SBFD slot format via DCI, an SBFD slot format table may be configured that includes SBFD-DL, SBFD-UL, or SBFD-flexible configuration information for the 14 symbol units that make up one SBFD slot. In this case, SBFD-DL, SBFD-UL, or SBFD-flexible information may be set for each index in the table, and the index in the table may be indicated via the DCI format.

[0225] Alternatively, the SBFD-DL, SBFD-UL or SBFD-flexible indication information may be directly transmitted in a symbol unit within the SBFD time slot via a DCI format used to indicate the SBFD time slot format.

[0226] Alternatively, the slot format indication information for an SBFD slot can be transmitted using the existing DCI format 2_0 for indicating the slot format, without defining a separate DCI format for indicating the SBFD slot format. That is, when the control unit 1410 indicates the slot format for an SBFD slot using DCI format 2_0, as in the existing method, the terminal can determine whether to perform downlink reception or uplink transmission in the SBFD slot.

[0227] When the control unit 1410 instructs the transmission direction link configuration information to be set to SBFD-DL in an SBFD time slot or SBFD symbol, downlink transmission operations using the downlink subband can be performed in this SBFD time slot or SBFD symbol. Similarly, when the control unit 1410 instructs the transmission direction link configuration information to be set to SBFD-UL in an SBFD time slot or SBFD symbol, uplink reception operations using the uplink subband can be performed in this SBFD time slot or SBFD symbol. Alternatively, when the control unit 1410 transmits the transmission direction link configuration information to be set to SBFD-flexible in an SBFD time slot or SBFD symbol, operations similar to those in existing flexible symbols can be performed in this SBFD time slot or SBFD symbol.

[0228] According to another example, the transmission direction link configuration information in the SBFD time slot or SBFD symbol may be determined based on scheduling control information including downlink assignment control information or uplink grant control information.

[0229] In this case, the terminal can determine downlink reception or uplink transmission operation in SBFD time slots or SBFD symbols based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information such as CSI-RS and SRS from the base station. That is, for all SBFD time slots or SBFD symbols, the terminal defines flexible symbol operation as the baseline operation and performs downlink reception or uplink transmission based on the PDSCH / PUSCH scheduling control information or reference signal transmission / reception configuration information from the base station.

[0230] According to an example, different transmission directions may be set in an SBFD time slot or SBFD symbol based on higher-layer signaling and scheduling control information. That is, for at least one SBFD symbol, when a conflict occurs between transmission direction link configuration information set according to higher-layer signaling and transmission direction link configuration information indicated according to physical layer (L1) control signaling, the base station may perform uplink reception or downlink transmission based on the transmission direction link configuration information indicated according to the physical layer (L1) control signaling.

[0231] That is, the control unit 1410 can be configured to perform uplink reception or downlink transmission based on a priority determined according to the signaling method. For example, it can be configured so that L1 control signaling transmitted via the PDCCH takes precedence over RRC signaling set via the PDSCH. Or, conversely, it can be configured so that RRC signaling set via the PDSCH takes precedence over L1 control signaling transmitted via the PDCCH.

[0232] Alternatively, the control unit 1410 may be configured to perform uplink reception or downlink transmission based on a priority determined according to the timing of the setting / instruction. For example, the most recently implemented setting / instruction may be prioritized.

[0233] Thus, a method and apparatus for efficiently performing uplink and downlink transmission / reception in time slots or symbols applicable to full-duplex communication can be provided.

[0234] The above-described embodiments may be supported by standard documents published in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. Specifically, in this embodiment, steps, components, and parts not described for the purpose of clearly explaining the technical concept may be supported by these standard documents. Furthermore, all terms disclosed in this specification are to be interpreted in accordance with these standard documents.

[0235] The above embodiment can be implemented by various means. For example, the embodiment can be implemented by hardware, firmware, software, or a combination thereof.

[0236] In the case of hardware implementation, the method according to this embodiment can 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, etc.

[0237] When implemented via firmware or software, the method according to this embodiment can be implemented in the form of a device, process, or function that performs the functions or operations described above. The software code can be stored in a storage unit and driven by a processor. The storage unit is located inside or outside the processor and can exchange data with the processor via various known devices.

[0238] In addition, the above-mentioned terms such as "system", "processor", "controller", "component", "module", "interface", "model" or "unit" may generally refer to physical hardware related to a computer, a combination of hardware and software, software or running software. For example, the aforementioned components may be processes driven by a processor, processors, controllers, control processors, individuals, execution threads, programs and / or computers, but are not limited to these. For example, an application running in a controller or processor and the controller or processor may become components. One or more components may be located in a process and / or execution thread, and a component may be located in one device (such as a system, computing device, etc.) or distributed in two or more devices.

[0239] The above description is merely an exemplary description of the technical ideas of the present disclosure, and those skilled in the art to which the present disclosure belongs may make various modifications and changes without departing from the essential features of the technical ideas of the present disclosure. In addition, the present embodiment is intended to illustrate the technical ideas of the present disclosure rather than to limit them, and therefore, the scope of the technical ideas of the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure should be interpreted in accordance with the following claims, and all technical ideas within the equivalent scope thereof should be interpreted as included within the scope of rights of the present disclosure.

[0240] CROSS-REFERENCE TO RELATED APPLICATIONS

[0241] This patent application claims priority under Section 119(a) of the United States Patent Act (35 U.S.C. §119(a)) to Patent Application No. 10-2023-0001985 filed in the Republic of Korea on January 5, 2023, and Patent Application No. 10-2024-0001787 filed in the Republic of Korea on January 4, 2024, the entire contents of which are hereby incorporated by reference into this patent application. Furthermore, this patent application claims priority in countries other than the United States for the same reasons as described above, the entire contents of which are hereby incorporated by reference into this patent application.

Claims

1. A method for a terminal to perform uplink transmission or downlink reception in full-duplex communication, comprising: The step of receiving configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols; The step of receiving configuration information of a sub-band for full-duplex communication and configuration information of a sub-band full-duplex time slot or a sub-band full-duplex symbol; as well as The step of performing uplink transmission or downlink reception based on the transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol.

2. The method according to claim 1, wherein The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is set through cell-specific upper layer signaling or terminal-specific upper layer signaling.

3. The method according to claim 1, wherein The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is indicated by physical layer control signaling for indicating a sub-band full-duplex symbol dedicated time slot format.

4. The method according to claim 1, wherein The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is determined based on scheduling control information including downlink allocation control information or uplink grant control information.

5. The method according to claim 1, wherein In the step of performing uplink transmission or downlink reception, For at least one sub-band full-duplex symbol, when a conflict occurs between the transmission direction link configuration information set according to the upper layer signaling and the transmission direction link configuration information indicated according to the physical layer control signaling, uplink transmission or downlink reception is performed based on the transmission direction link configuration information indicated according to the physical layer control signaling.

6. A method for a base station to perform uplink reception or downlink transmission in full-duplex communication, comprising: The step of transmitting configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols; The step of transmitting configuration information of a sub-band for full-duplex communication and configuration information of a sub-band full-duplex time slot or a sub-band full-duplex symbol; as well as The step of performing uplink reception or downlink transmission based on the transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol.

7. The method according to claim 6, wherein: The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is set through cell-specific upper layer signaling or terminal-specific upper layer signaling.

8. The method according to claim 6, wherein: The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is indicated by physical layer control signaling for indicating a sub-band full-duplex symbol dedicated time slot format.

9. The method according to claim 6, wherein: The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is determined based on scheduling control information including downlink allocation control information or uplink grant control information.

10. The method according to claim 6, wherein: In the step of performing uplink reception or downlink transmission, For at least one sub-band full-duplex symbol, when a conflict occurs between the transmission direction link configuration information set according to the upper layer signaling and the transmission direction link configuration information indicated according to the physical layer control signaling, uplink reception or downlink transmission is performed based on the transmission direction link configuration information indicated according to the physical layer control signaling.

11. A terminal for performing uplink transmission or downlink reception in full-duplex communication, comprising: Sending Department; Receiving Department; as well as a control unit for controlling the operations of the sending unit and the receiving unit, Wherein, in the control unit, receiving configuration information of downlink time slots and downlink symbols, uplink time slots and uplink symbols, receiving configuration information of a sub-band for full-duplex communication and configuration information of a sub-band full-duplex time slot or a sub-band full-duplex symbol, Uplink transmission or downlink reception is performed based on transmission direction link configuration information in a sub-band full-duplex time slot or a sub-band full-duplex symbol.

12. The terminal according to claim 11, wherein: The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is set through cell-specific upper layer signaling or terminal-specific upper layer signaling. The terminal according to claim 11 , wherein: The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is indicated by physical layer control signaling for indicating a sub-band full-duplex symbol dedicated time slot format. The terminal according to claim 11 , wherein: The transmission direction link configuration information in the sub-band full-duplex time slot or the sub-band full-duplex symbol is determined based on scheduling control information including downlink allocation control information or uplink grant control information. The terminal according to claim 11 , wherein: In the control unit, For at least one sub-band full-duplex symbol, when a conflict occurs between the transmission direction link configuration information set according to the upper layer signaling and the transmission direction link configuration information indicated according to the physical layer control signaling, uplink transmission or downlink reception is performed based on the transmission direction link configuration information indicated according to the physical layer control signaling.

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