Method and apparatus for uplink communication in SBFD subband

Abstract

Disclosed are a method and apparatus for uplink communication in a subband full duplex (SBFD) subband. A method for a user equipment (UE) comprises the steps of: receiving SBFD configuration information from a base station; on the basis of information included in the SBFD configuration information, identifying an uplink (UL) subband configured in a downlink (DL) period within a time domain; and performing UL communication with the base station after transmission of a synchronization signal block (SSB) by the base station within the UL subband.

Description

Method and device for uplink communication in SBFD subband

[0001] The present disclosure relates to improved communication technology, and more particularly, to uplink communication technology in a subband full duplex (SBFD) subband.

[0002] Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) are being developed to provide improved communication services compared to existing communication networks (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), etc.). 5G communication networks (e.g., new radio (NR) communication networks) can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. That is, 5G communication networks can support FR1 bands and / or FR2 bands. 5G communication networks can support various communication services and scenarios compared to LTE communication networks. For example, usage scenarios of 5G communication networks can include enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared to 5G, 6G communication networks can support a wider range of communication services and scenarios. 6G communication networks can meet requirements for ultra-high performance, ultra-high bandwidth, ultra-high space, ultra-high precision, ultra-intelligence, and / or ultra-reliability. 6G communication networks can support diverse and wide frequency bands and be applied to various usage scenarios (e.g., terrestrial communications, non-terrestrial communications, sidelink communications, etc.).

[0004] Meanwhile, a communication network may support subband full duplex (SBFD) operation. In a communication network supporting SBFD operation, uplink (UL) subbands may be configured in downlink (DL) sections. Methods for indicating the location of UL subbands configured in DL sections may be required. Furthermore, DL transmissions may occur in UL subbands, and in this case, methods for resolving collisions between DL and UL transmissions may be required.

[0005] The purpose of the present disclosure to solve the above problems is to provide a method and device for uplink communication in a subband full duplex (SBFD) subband.

[0006] A method of a UE (user equipment) according to embodiments of the present disclosure for achieving the above object includes: receiving subband full duplex (SBFD) configuration information from a base station; identifying an uplink (UL) subband configured in a downlink (DL) section within a time domain based on information included in the SBFD configuration information; and performing UL communication with the base station after DL transmission of the base station within the UL subband.

[0007] The above UL communication can be performed after a time gap from the above DL transmission.

[0008] The above DL transmission may be a SSB (synchronization signal block) transmission.

[0009] The above time gap can be set to the UE by the base station.

[0010] The above time gap can be set in symbol units.

[0011] The above UL communication may be performed in the UL subband that does not overlap with at least one resource for the DL transmission, and the DL transmission may be an SSB transmission.

[0012] The above UL communication may be a transmission of an RA (random access) preamble, and an RO (RACH (random access channel) occasion) for transmission of the RA preamble may be set within the UL subband.

[0013] Within the above UL subband, the UL communication may be performed after a time gap from the last N(non)-SBFD symbol.

[0014] The above UL communication may be a grant-based UL transmission or a CG (configured grant)-based UL transmission, and the UL communication may be performed in an available resource that does not overlap with the DL transmission of the base station within the UL subband.

[0015] If the UL subband can overlap with at least one resource for semi-persistent scheduling (SPS) DL (downlink) transmission, and the priority of the UL communication is higher than the priority of the SPS DL transmission, the UL communication can be performed within the UL subband.

[0016] A method of a base station according to embodiments of the present disclosure for achieving the above object includes: generating subband full duplex (SBFD) configuration information; transmitting the SBFD configuration information to a UE (user equipment); identifying an uplink (UL) subband configured in a downlink (DL) section within a time domain based on information included in the SBFD configuration information; and performing UL communication with the UE after DL transmission of the base station within the UL subband.

[0017] The above UL communication can be performed after a time gap from the above DL transmission.

[0018] The above DL transmission may be a SSB (synchronization signal block) transmission.

[0019] The above time gap can be set to the UE by the base station.

[0020] The above time gap can be set in symbol units.

[0021] The above UL communication may be performed in the UL subband that does not overlap with at least one resource for the DL transmission, and the DL transmission may be SSB transmission.

[0022] The above UL communication may be a transmission of an RA (random access) preamble, and an RO (RACH (random access channel) occasion) for transmission of the RA preamble may be set within the UL subband.

[0023] Within the above UL subband, the UL communication may be performed after a time gap from the last N(non)-SBFD symbol.

[0024] The above UL communication may be a grant-based UL transmission or a CG (configured grant)-based UL transmission, and the UL communication may be performed in an available resource that does not overlap with the DL transmission of the base station within the UL subband.

[0025] If the UL subband can overlap with at least one resource for semi-persistent scheduling (SPS) DL (downlink) transmission, and the priority of the UL communication is higher than the priority of the SPS DL transmission, the UL communication can be performed within the UL subband.

[0026] According to the present disclosure, a base station can transmit information indicating a start point and / or an end point of an uplink (UL) subband configured within a downlink (DL) section to a terminal. The terminal can identify the position of the UL subband within the DL section based on the information received from the base station, and perform UL communication with the base station within the UL subband. According to the above-described operation, the position of the UL subband within the DL section can be accurately indicated, and the efficiency of subband full duplex (SBFD) operation can be improved. When a synchronization signal block (SSB) transmission of the base station is performed within the UL subband, the terminal can perform UL transmission after a time gap from the SSB transmission within the UL subband. According to the above-described operation, collision between UL transmission and DL transmission in the UL subband can be prevented, and the efficiency of UL transmission in the UL subband can be improved.

[0027] Figure 1 is a conceptual diagram illustrating embodiments of a communication system.

[0028] Figure 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0029] Figure 3 is a block diagram illustrating embodiments of communication nodes that perform communication.

[0030] Figure 4a is a block diagram illustrating embodiments of a transmission path.

[0031] Figure 4b is a block diagram illustrating embodiments of a receiving path.

[0032] Figure 5 is a conceptual diagram illustrating embodiments of system frames in a communication system.

[0033] Figure 6 is a conceptual diagram illustrating embodiments of subframes in a communication system.

[0034] Figure 7 is a conceptual diagram illustrating embodiments of slots in a communication system.

[0035] Figure 8 is a conceptual diagram illustrating embodiments of time-frequency resources in a communication system.

[0036] Figure 9 is a conceptual diagram illustrating an example of resource configuration by TDD common settings.

[0037] FIG. 10a is a conceptual diagram illustrating a first embodiment of a starting point of a UL subband.

[0038] FIG. 10b is a conceptual diagram illustrating a second embodiment of the starting point of a UL subband.

[0039] Figure 11 is a conceptual diagram illustrating an embodiment of UL transmission within a UL subband.

[0040] Figure 12 is a conceptual diagram illustrating the period of a UL subband pattern and the interval of a UL subband.

[0041] Figures 13a, 13b, and 13c are conceptual diagrams illustrating validation rules of UL subbands.

[0042] FIG. 14a, FIG. 14b, FIG. 14c, FIG. 14d, and FIG. 14e are conceptual diagrams illustrating embodiments of setting UL subbands.

[0043] Figure 15 is a flowchart illustrating a UL communication method in a UL subband.

[0044] This disclosure may be subject to various modifications and various embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the disclosure to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the disclosure.

[0045] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" may refer to a combination of multiple related items described herein or to any of multiple related items described herein.

[0046] In the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Additionally, in the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.”

[0047] In the present disclosure, (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission,” (re)setting may mean “setting,” “resetting,” or “setting and resetting,” (re)connection may mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection.”

[0048] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0049] The terminology used in this disclosure is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0050] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0051] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding in describing the present disclosure, the same reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted. In addition to the embodiments explicitly described in the present disclosure, operations may be performed according to combinations of embodiments, extensions of embodiments, and / or modifications of embodiments. The performance of some operations may be omitted, and the order of operation may be changed.

[0052] In an embodiment, even if a method (e.g., transmitting or receiving a signal) performed by a first communication node among communication nodes is described, a corresponding second communication node can perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed by the first communication node. That is, if an operation of a UE (user equipment) is described, a corresponding base station can perform an operation corresponding to the operation of the UE. Conversely, if an operation of a base station is described, a corresponding UE can perform an operation corresponding to the operation of the base station.

[0053] A base station may be referred to as a NodeB, an evolved NodeB, a gNodeB (next generation node B), a gNB, a device, an apparatus, a node, a communication node, a BTS (base transceiver station), a RRH (radio remote head), a TRP (transmission reception point), a RU (radio unit), an RSU (road side unit), a radio transceiver, an access point, an access node, etc. A UE may be referred to as a terminal, a device, an apparatus, a node, a communication node, an end node, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, an OBU (on-broad unit), etc.

[0054] In the present disclosure, signaling may be at least one of upper layer signaling, MAC signaling, or PHY (physical) signaling. A message used for upper layer signaling may be referred to as an "upper layer message" or an "upper layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Upper layer signaling may refer to a transmission and reception operation of system information (e.g., a master information block (MIB), a system information block (SIB)) and / or a radio resource control (RRC) message. MAC signaling may refer to a transmission and reception operation of a MAC control element (CE). PHY signaling may refer to a transmission and reception operation of control information (e.g., downlink control information (DCI), uplink control information (UCI), sidelink control information (SCI)).

[0055] In the present disclosure, “an operation (e.g., a transmission operation) is set” may mean that “setting information for the operation (e.g., an information element, a parameter)” and / or “information instructing the performance of the operation” is signaled. “An information element (e.g., a parameter) is set” may mean that the information element is signaled. In the present disclosure, “a signal and / or a channel” may mean a signal, a channel, or “a signal and a channel,” and a signal may be used to mean “a signal and / or a channel.”

[0056] The communication network to which the embodiment is applied is not limited to what is described below, and the embodiment may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the communication network may be used in the same sense as the communication system.

[0057] Figure 1 is a conceptual diagram illustrating embodiments of a communication system.

[0058] Referring to FIG. 1, the communication system (100) may include a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). In addition, the communication system (100) may further include a core network (e.g., a serving-gateway (S-GW), a packet data network (PDN)-gateway (P-GW), a mobility management entity (MME)). If the communication system (100) is a 5G communication system (e.g., a new radio (NR) system), the core network may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0059] A plurality of communication nodes (110 to 130) can support a communication protocol (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.) specified in the 3GPP (3rd generation partnership project) standard. The plurality of communication nodes (110 to 130) may support CDMA (code division multiple access) technology, WCDMA (wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (non-orthogonal multiple access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (space division multiple access) technology, etc. Each of the plurality of communication nodes may have the following structure.

[0060] Figure 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0061] Referring to FIG. 2, a communication node (200) may include at least one processor (210), a memory (220), and a transmission / reception device (230) that is connected to a network and performs communication. In addition, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) and communicate with each other.

[0062] The processor (210) can execute program commands stored in at least one of the memory (220) and the storage device (260). The processor (210) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which the methods according to embodiments of the present disclosure are performed. Each of the memory (220) and the storage device (260) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0063] Referring again to FIG. 1, the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) may form a macro cell. Each of the fourth base station (120-1) and the fifth base station (120-2) may form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) may be within the cell coverage of the first base station (110-1). The second terminal (130-2), the fourth terminal (130-4), and the fifth terminal (130-5) may be within the cell coverage of the second base station (110-2). The fifth base station (120-2), the fourth terminal (130-4), the fifth terminal (130-5), and the sixth terminal (130-6) may be within the cell coverage of the third base station (110-3). The first terminal (130-1) may be within the cell coverage of the fourth base station (120-1). The sixth terminal (130-6) may be within the cell coverage of the fifth base station (120-2).

[0064] Here, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as a NodeB (NB), an evolved NodeB (eNB), a gNB, an advanced base station (ABS), a high reliability-base station (HR-BS), a base transceiver station (BTS), a radio base station, a radio transceiver, an access point, an access node, a radio access station (RAS), a mobile multihop relay-base station (MMR-BS), a relay station (RS), an advanced relay station (ARS), a high reliability-relay station (HR-RS), a home NodeB (HNB), a home eNodeB (HeNB), a road side unit (RSU), a radio remote head (RRH), a transmission point (TP), a transmission and reception point (TRP), etc.

[0065] Each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as a user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), high reliability-mobile station (HR-MS), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, on board unit (OBU), etc.

[0066] Meanwhile, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may operate in a different frequency band or may operate in the same frequency band. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to each other via an ideal backhaul link or a non-ideal backhaul link, and may exchange information with each other via the ideal backhaul link or the non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to the core network via the ideal backhaul link or the non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.

[0067] Additionally, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may support MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, sidelink communication (e.g., device to device communication (D2D), proximity services (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc. Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2). For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO scheme, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) by the SU-MIMO scheme. Alternatively, the second base station (110-2) can transmit signals to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive signals from the second base station (110-2) based on the MU-MIMO method.

[0068] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP scheme, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) based on the CoMP scheme. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive a signal with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage based on the CA scheme. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control sidelink communication between the fourth terminal (130-4) and the fifth terminal (130-5), and each of the fourth terminal (130-4) and the fifth terminal (130-5) can perform sidelink communication under the control of the second base station (110-2) and the third base station (110-3), respectively.

[0069] Meanwhile, communication nodes performing communication in a communication network may be configured as follows. The communication node illustrated in Fig. 3 may be a specific embodiment of the communication node illustrated in Fig. 2.

[0070] Figure 3 is a block diagram illustrating embodiments of communication nodes that perform communication.

[0071] Referring to FIG. 3, each of the first communication node (300a) and the second communication node (300b) may be a base station or a UE. The first communication node (300a) may transmit a signal to the second communication node (300b). The transmission processor (311) included in the first communication node (300a) may receive data (e.g., a data unit) from a data source (310). The transmission processor (311) may receive control information from the controller (316). The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0072] The transmitting processor (311) may perform a processing operation on data (e.g., an encoding operation, a symbol mapping operation, etc.) to generate data symbol(s). The transmitting processor (311) may perform a processing operation on control information (e.g., an encoding operation, a symbol mapping operation, etc.) to generate control symbol(s). In addition, the transmitting processor (311) may generate synchronization / reference symbol(s) for a synchronization signal and / or a reference signal.

[0073] The Tx MIMO processor (312) may perform a spatial processing operation (e.g., a precoding operation) on data symbol(s), control symbol(s), and / or synchronization / reference symbol(s). The output (e.g., a symbol stream) of the Tx MIMO processor (312) may be provided to modulators (MODs) included in the transceivers (313a to 313t). The modulators (MODs) may perform a processing operation on the symbol stream to generate modulation symbols, and may perform an additional processing operation (e.g., an analog conversion operation, an amplification operation, a filtering operation, an upconversion operation) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (313a to 313t) may be transmitted via the antennas (314a to 314t).

[0074] Signals transmitted by the first communication node (300a) may be received by antennas (364a to 364r) of the second communication node (300b). Signals received by the antennas (364a to 364r) may be provided to demodulators (DEMODs) included in transceivers (363a to 363r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (362) may perform a MIMO detection operation on the symbols. The receiving processor (361) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (361) may be provided to a data sink (360) and a controller (366). For example, data may be provided to the data sink (360), and control information may be provided to the controller (366).

[0075] Meanwhile, the second communication node (300b) can transmit a signal to the first communication node (300a). The transmitting processor (368) included in the second communication node (300b) can receive data (e.g., data units) from a data source (367) and perform a processing operation on the data to generate data symbol(s). The transmitting processor (368) can receive control information from the controller (366) and perform a processing operation on the control information to generate control symbol(s). In addition, the transmitting processor (368) can perform a processing operation on a reference signal to generate reference symbol(s).

[0076] The Tx MIMO processor (369) may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or reference symbol(s). The output (e.g., symbol stream) of the Tx MIMO processor (369) may be provided to modulators (MODs) included in the transceivers (363a to 363t). The modulators (MODs) may perform processing operations on the symbol streams to generate modulation symbols, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (363a to 363t) may be transmitted via the antennas (364a to 364t).

[0077] Signals transmitted by the second communication node (300b) may be received by the antennas (314a to 314r) of the first communication node (300a). The signals received by the antennas (314a to 314r) may be provided to demodulators (DEMODs) included in the transceivers (313a to 313r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (320) may perform a MIMO detection operation on the symbols. The receiving processor (319) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (319) may be provided to a data sink (318) and a controller (316). For example, data may be provided to the data sink (318) and control information may be provided to the controller (316).

[0078] Memories (315 and 365) can store data, control information, and / or program code. Scheduler (317) can perform scheduling operations for communication. The processors (311, 312, 319, 361, 368, 369) and controllers (316, 366) illustrated in FIG. 3 may be the processor (210) illustrated in FIG. 2 and may be used to perform the methods described in the present disclosure.

[0079] FIG. 4a is a block diagram illustrating embodiments of a transmission path, and FIG. 4b is a block diagram illustrating embodiments of a reception path.

[0080] Referring to FIGS. 4A and 4B, a transmission path (410) may be implemented in a communication node that transmits a signal, and a reception path (420) may be implemented in a communication node that receives a signal. The transmission path (410) may include a channel coding and modulation block (411), an S-to-P (serial-to-parallel) block (512), an N IFFT (Inverse Fast Fourier Transform) block (413), a P-to-S (parallel-to-serial) block (414), a CP (cyclic prefix) addition block (415), and an UC (up-converter) (UC) (416). The receiving path (420) may include a DC (down-converter) (421), a CP removal block (422), an S-to-P block (423), an N FFT block (424), a P-to-S block (425), and a channel decoding and demodulation block (426). Here, N may be a natural number.

[0081] In the transmission path (410), information bits may be input to a channel coding and modulation block (411). The channel coding and modulation block (411) may perform a coding operation (e.g., a low-density parity check (LDPC) coding operation, a polar coding operation, etc.) and a modulation operation (e.g., a quadrature phase shift keying (QPSK), a quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block (411) may be a sequence of modulation symbols.

[0082] The S-to-P block (412) can convert modulation symbols in the frequency domain into parallel symbol streams to generate N parallel symbol streams. N can be an IFFT size or an FFT size. The N IFFT block (413) can perform an IFFT operation on the N parallel symbol streams to generate signals in the time domain. The P-to-S block (414) can convert the output (e.g., parallel signals) of the N IFFT block (413) into a serial signal to generate a serial signal.

[0083] The CP addition block (415) can insert a CP into a signal. The UC (416) can up-convert the frequency of the output of the CP addition block (415) to an RF (radio frequency) frequency. Additionally, the output of the CP addition block (415) can be filtered at the baseband before up-conversion.

[0084] A signal transmitted from a transmission path (410) may be input to a reception path (420). An operation in the reception path (420) may be the reverse operation of the operation in the transmission path (410). A DC (421) may down-convert the frequency of the received signal to a baseband frequency. A CP removal block (422) may remove a CP from a signal. The output of the CP removal block (422) may be a serial signal. An S-to-P block (423) may convert the serial signal into parallel signals. An N FFT block (424) may perform an FFT algorithm to generate N parallel signals. A P-to-S block (425) may convert the parallel signals into a sequence of modulation symbols. A channel decoding and demodulation block (426) may perform a demodulation operation on the modulation symbols and perform a decoding operation on the result of the demodulation operation to restore data.

[0085] In FIGS. 4A and 4B , Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT. Each of the blocks (e.g., components) in FIGS. 4A and 4B may be implemented by at least one of hardware, software, or firmware. For example, some of the blocks in FIGS. 4A and 4B may be implemented by software, and the remaining blocks may be implemented by hardware or a “combination of hardware and software.” In FIGS. 4A and 4B , a block may be subdivided into multiple blocks, multiple blocks may be integrated into a single block, some blocks may be omitted, and blocks supporting other functions may be added.

[0086] Figure 5 is a conceptual diagram illustrating embodiments of a system frame in a communication system.

[0087] Referring to FIG. 5, time resources in a communication system can be divided into frame units. For example, system frames can be set consecutively in the time domain of the communication system. The length of a system frame can be 10 ms (milliseconds). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0088] A system frame may include two half frames. A half frame may be 5 ms long. A half frame located at the beginning of the system frame may be referred to as "half frame #0," and a half frame located at the end of the system frame may be referred to as "half frame #1." A system frame may include 10 subframes. A subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as "subframes #0-9."

[0089] Figure 6 is a conceptual diagram illustrating embodiments of subframes in a communication system.

[0090] Referring to FIG. 6, one subframe may include n slots, where n may be a natural number. Accordingly, one subframe may be composed of one or more slots.

[0091] Figure 7 is a conceptual diagram illustrating embodiments of slots in a communication system.

[0092] Referring to FIG. 7, a single slot may include one or more symbols. A single slot illustrated in FIG. 7 may include 14 symbols. The length of a slot may vary depending on the number and length of symbols contained in the slot. Alternatively, the length of a slot may vary depending on numerology.

[0093] In a communication system, the numerology applied to physical signals and channels may be variable. The numerology may be variable to meet various technical requirements of the communication system. In a communication system applying CP (cyclic prefix)-based OFDM waveform technology, the numerology may include subcarrier spacing and CP length (or CP type). Table 1 may be a first embodiment of a method for configuring a numerology for a CP-OFDM-based communication system. At least some of the numerologies in Table 1 may be supported depending on the frequency band in which the communication system operates. In addition, the communication system may additionally support numerologies not listed in Table 1.

[0094]

[0095] When the subcarrier spacing is 15 kHz (e.g., μ=0), the slot length can be 1 ms. In this case, one system frame can contain 10 slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the slot length can be 0.5 ms. In this case, one system frame can contain 20 slots.

[0096] When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, one system frame can contain 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, one system frame can contain 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, one system frame can contain 160 slots.

[0097] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting solely of DL symbols may be referred to as a "DL slot," a slot consisting solely of FL symbols may be referred to as an "FL slot," and a slot consisting solely of UL symbols may be referred to as a "UL slot."

[0098] The slot format can be semi-statically configured by higher layer signaling (e.g., RRC signaling). Information indicating the semi-static slot format can be included in the system information, and the semi-static slot format can be configured cell-specifically. In addition, the semi-static slot format can be additionally configured for each terminal through terminal-specific higher layer signaling (e.g., RRC signaling). The flexible symbol of the cell-specifically configured slot format can be overridden to a downlink symbol or an uplink symbol by terminal-specific higher layer signaling. In addition, the slot format can be dynamically indicated by physical layer signaling (e.g., a slot format indicator (SFI) included in DCI). The semi-statically configured slot format can be overridden by a dynamically indicated slot format. For example, the semi-statically configured flexible symbol can be overridden to a downlink symbol or an uplink symbol by the SFI.

[0099] The reference signal may be a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), a phase tracking-reference signal (PT-RS), etc. The channel may be a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), etc. In the present disclosure, a control channel may mean a PDCCH, a PUCCH, or a PSCCH, and a data channel may mean a PDSCH, a PUSCH, or a PSSCH.

[0100] Figure 8 is a conceptual diagram illustrating embodiments of time-frequency resources in a communication system.

[0101] Referring to FIG. 8, a resource consisting of one symbol (e.g., an OFDM symbol) in the time domain and one subcarrier in the frequency domain may be defined as a "RE (resource element)". Resources consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain may be defined as a "REG (resource element group)". A REG may include K REs. A REG may be used as a basic unit for resource allocation in the frequency domain. K may be a natural number. For example, K may be 12. N may be a natural number. In the slot illustrated in FIG. 7, N may be 14. N OFDM symbols may be used as a basic unit for resource allocation in the time domain.

[0102] In the present disclosure, RB may mean CRB (common RB). Alternatively, RB may mean PRB or VRB (virtual RB). In a communication system, CRB may mean RB that constitutes a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). Carriers and / or bandwidth portions may be arranged on the common RB grid. That is, the carrier and / or bandwidth portions may be composed of CRB(s). RBs or CRBs that constitute the bandwidth portions may be referred to as PRBs, and within the bandwidth portions, the CRB index may be appropriately converted to the PRB index.

[0103] Downlink data can be transmitted via the PDSCH. The base station can transmit PDSCH configuration information (e.g., scheduling information) to the terminal via the PDCCH. The terminal can obtain the PDSCH configuration information by receiving the PDCCH (e.g., downlink control information (DCI)). For example, the PDSCH configuration information can include the MCS (modulation coding scheme) used for transmitting and receiving the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, feedback resource information for the PDSCH, etc. The PDSCH can refer to a radio resource through which downlink data is transmitted and received. Alternatively, the PDSCH can refer to the downlink data itself. The PDCCH can refer to a radio resource through which downlink control information (e.g., DCI) is transmitted and received. Alternatively, the PDCCH can refer to the downlink control information itself.

[0104] A terminal can perform a monitoring operation on the PDCCH to receive a PDSCH transmitted from a base station. The base station can inform the terminal of the configuration information for the PDCCH monitoring operation using a higher layer message (e.g., an RRC (radio resource control) message). The configuration information for the PDCCH monitoring operation can include CORESET (control resource set) information and search space information.

[0105] CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH occasion information, etc. The PDCCH DMRS may be a DMRS used to demodulate the PDCCH. The PDCCH occasion may be a region where the PDCCH can exist. That is, the PDCCH occasion may be a region where DCI can be transmitted. The PDCCH occasion may be referred to as a PDCCH candidate. The PDCCH occasion information may include time resource information and frequency resource information of the PDCCH occasion. In the time domain, the length of the PDCCH occasion may be indicated in symbol units. In the frequency domain, the size of the PDCCH occasion may be indicated in RB units (e.g., in PRB (physical resource block) units or CRB (common resource block) units).

[0106] The search space information may include a coreset identifier (ID) associated with the search space, a period of PDCCH monitoring, and / or an offset. The period and offset of PDCCH monitoring may each be indicated on a slot-by-slot basis. In addition, the search space information may further include an index of the symbol at which the PDCCH monitoring operation begins.

[0107] A base station can configure a bandwidth part (BWP) for downlink communication. The BWP can be configured differently for each terminal. The base station can inform the terminal of the BWP configuration information using higher layer signaling. The higher layer signaling can mean "transmission operation of system information" and / or "transmission operation of RRC (radio resource control) message." The number of BWPs configured for one terminal can be one or more. The terminal can receive BWP configuration information from the base station and check the BWP(s) configured by the base station based on the BWP configuration information. When multiple BWPs are configured for downlink communication, the base station can activate one or more BWPs among the multiple BWPs. The base station can transmit the configuration information of the activated BWP(s) to the terminal using at least one of higher layer signaling, a medium access control (MAC) control element (CE), or DCI. The base station can perform downlink communication using the activated BWP(s). The terminal can identify the activated BWP(s) by receiving configuration information of the activated BWP(s) from the base station, and perform a downlink reception operation in the activated BWP(s).

[0108] Meanwhile, communication systems (e.g., NR communication systems, 5G communication systems, 6G communication systems) can support usage scenarios such as eMBB (enhanced Mobile Broadband), URLLC (Ultra Reliable Low Latency Communication), and mMTC (massive Machine Type Communication). Communication systems (e.g., communication networks) can support SBFD (subband full duplex) operation.

[0109] A communication system may support TDD (time division duplexing). In a communication system supporting TDD (hereinafter referred to as a "TDD communication system"), downlink (DL) symbol(s) and uplink (UL) symbol(s) may be configured in different time resources within a single carrier. DL and UL symbols may be associated with coverage and / or latency. In a TDD communication system, a base station can utilize resources more efficiently than in a frequency division duplexing (FDD) scheme by considering various use cases. Resource scheduling operations of the base station may be important in a TDD communication system. For improved TDD operation, SBFD operation (e.g., SBFD operation) may be supported. When SBFD operation is supported in a TDD communication system, DL communication (e.g., transmission and reception of DL signals) and UL communication (e.g., transmission and reception of UL signals) may be performed simultaneously within the same time resource. For example, within the same time resource, some subbands may be DL subbands, while other subbands may be UL subbands and / or FL subbands. In the present disclosure, a DL signal may be interpreted as a DL signal, a DL channel, or "a DL signal and a DL channel" depending on the context. In the present disclosure, a UL signal may be interpreted as a UL signal, an UL channel, or "a UL signal and a UL channel" depending on the context.

[0110] A symbol to which the SBFD operation is applied may be referred to as an SBFD symbol. A symbol to which the SBFD operation is not applied may be referred to as an N(non)-SBFD symbol. An N-SBFD symbol may be a DL symbol, an UL symbol, or an FL symbol. In an SBFD symbol, a terminal may perform DL communication and UL communication. In other words, in an SBFD symbol, a terminal may perform full duplex operation. In an N-SBFD symbol, a terminal may perform one of DL communication and UL communication. In other words, in an N-SBFD symbol, a terminal may perform half duplex operation. An SBFD symbol may be a symbol including a subband on which an SBFD operation is performed. A subband for SBFD may be referred to or interpreted as a UL subband. A UL subband may be present (e.g., configured) in a symbol in which an SSB (synchronization signal block) is transmitted.

[0111] Resources (e.g., time resources and / or frequency resources) for SBFD operation can be configured in a semi-static manner. In other words, the configuration for SBFD resources can be a semi-static configuration. "The SBFD resource configuration being a semi-static configuration" can mean "the SBFD resource is configured by semi-static signaling (e.g., system information, RRC message)." In the present disclosure, SBFD resources can mean time resources and / or frequency resources for SBFD operation. A UL subband for SBFD can be an SBFD resource. Alternatively, SBFD resources can be configured in a dynamic manner. "The SBFD resource configuration being a dynamic configuration" can mean "the SBFD resource is configured by dynamic signaling (e.g., MAC CE, DCI, SCI)."

[0112] SBFD resources (e.g., UL subbands, SBFD symbols) can be configured within DL resources and / or FL (flexible) resources configured by TDD-UL-DL configuration common information (e.g., TDD-UL-DL-configCommon). The transition point from an N-SBFD symbol to an SBFD symbol in the time domain can be limited to one. The transition point from an SBFD symbol to an N-SBFD symbol in the time domain can be limited to one. With respect to resource configuration of a subband for SBFD, it may be desirable for a terminal to recognize resource configuration information of a subband for SBFD in advance.

[0113] The TDD-UL-DL configuration common information can be used to configure a pattern (e.g., TDD-UL-DL-Pattern) for DL ​​resources and / or UL resources in the time domain of a TDD communication system. The pattern for DL ​​resources and / or UL resources can be referred to as a UL / DL pattern. The UL / DL pattern can be changed according to the environment of the communication system (e.g., TDD communication system). Up to two UL / DL patterns can be configured for a terminal. The TDD-UL-DL configuration common information can be a cell-specific parameter (e.g., cell-specific configuration information). The base station can change the configuration (e.g., transmission direction, type) for symbol(s) for each terminal based on a specific slot within a preset UL / DL pattern. A slot for which the symbol configuration (e.g., symbol direction, symbol type) can be changed can be a slot configured as an FL resource by the TDD-UL-DL configuration common information. The symbol direction (e.g., symbol transmission direction) and / or symbol type may be DL, UL, or FL. The RRC signaling used to change the configuration of an FL slot (e.g., FL resource) may be TDD-UL-DL configuration dedicated information (e.g., TDD-UL-DL-ConfigDedicated). Table 2 may be TDD-UL-DL configuration common information, and Tables 3 and 4 may be TDD-UL-DL configuration dedicated information.

[0114]

[0115]

[0116]

[0117] The UL / DL pattern configured by the TDD-UL-DL configuration common information can be repeated according to a specific period (e.g., dl-UL-TransmissionPeriodicity). In the time period to which the UL / DL pattern is applied, the front region can be configured as a DL resource. In the time period to which the UL / DL pattern is applied, the rear region can be configured as a UL resource. In the time period to which the UL / DL pattern is applied, resources that are not configured as DL resources or UL resources can be FL resources. The period of the UL / DL pattern can vary depending on the reference numerology. A guard time (e.g., a guard gap) may be required for switching (e.g., transition) from a DL resource (e.g., a DL symbol / slot) to a UL resource (e.g., a UL symbol / slot). Since the propagation delay of DL signals causes interference to UL resources, a guard time may be required for switching from DL resources to UL resources. A separate guard time may not be required for switching from UL resources to DL resources. Since UL signals are transmitted based on the timing advance command (TAC) indicated by the base station, a guard time may not be required for switching from UL resources to DL resources.

[0118] To support SBFD operation, SBFD resource configuration may be required. In the present disclosure, methods for configuring time resources and / or frequency resources for subbands (e.g., UL subbands) for SBFD will be described. TDD-UL-DL configuration common information (e.g., TDD-UL-DL-ConfigCommon) may be referred to as "TDD common" or "TDD common information." TDD-UL-DL configuration dedicated information (e.g., TDD-UL-DL-ConfigDedicated) may be referred to as "TDD dedicated" or "TDD dedicated information." A UL subband may mean a subband for SBFD. DL symbol(s) and / or DL ​​slot(s) may be referred to as a DL region (or DL ​​resource). UL symbol(s) and / or UL slot(s) may be referred to as a UL region (or UL resource). FL symbol(s) and / or FL slot(s) may be referred to as FL area (or FL resource).

[0119] Setting the time domain of SBFD resources (e.g., UL subband, SBFD subband)

[0120] For a terminal in an RRC connection state, the time position(s) of the SBFD subband may be configured within a cycle (hereinafter referred to as "SBFD cycle"). If at least one UL / DL pattern is configured, the SBFD cycle may be determined based on option 1 or option 2 below.

[0121] - Option 1: The SBFD period can be the same as the UL / DL pattern period indicated by dl-UL-TransmissionPeriodicity included in the TDD-UL-DL configuration common information.

[0122] - Option 2: The SBFD period can be an integer multiple of the UL / DL pattern period indicated by dl-UL-TransmissionPeriodicity included in the TDD-UL-DL configuration common information.

[0123] A slot may include SBFD symbol(s) and N-SBFD symbol(s). When one UL / DL pattern is configured, SBFD symbols may be configured consecutively within the UL / DL pattern period. When two UL / DL patterns are configured and SBFD symbols are configured for one of the two UL / DL patterns, the SBFD symbols may be configured consecutively within the UL / DL pattern period. When two UL / DL patterns are configured and SBFD symbols are configured for the two UL / DL patterns, the SBFD symbols may be configured consecutively within each UL / DL pattern period.

[0124] SBFD symbols can be set within DL symbols and / or FL symbols set by the TDD common information. SBFD symbols can start from any symbol within a slot. SBFD symbols can end from any symbol within a slot. The reference subcarrier spacing (SCS) indicated by the TDD common information can be used as the reference SCS (e.g., the reference SCS for SBFD symbols).

[0125] For SBFD-aware terminal transmission and reception within DL symbols and / or FL symbols set by TDD common information, UL transmissions within UL usable physical resource blocks (PRBs) may be allowed, DL receptions within DL usable PRBs may be allowed, UL transmissions outside UL usable PRBs may not be allowed, and DL receptions outside DL usable PRBs may not be allowed. The above restrictions may not apply to cross link interference (CLI) measurements.

[0126] For SBFD-aware terminal transmission and reception in SBFD symbols, the following options for determining link direction (e.g., transmission and / or reception) may be considered.

[0127] - Option 1: The terminal can determine the link direction based on established transmission, established reception, scheduled transmission, scheduled reception, and / or collision handling.

[0128] - Option 2: The link direction can be explicitly indicated by the base station.

[0129] Figure 9 is a conceptual diagram illustrating an example of resource configuration by TDD common settings.

[0130] Referring to FIG. 9, DL resources, FL resources, and UL resources can be configured within a period indicated by dl-UL-TransmissionPeriodicity. nrofDownlinkSlots can indicate the number of DL slots. nrofDownlinkSymbols can indicate the number of DL symbols. nrofUplinkSlots can indicate the number of UL slots. nrofUplinkSymbols can indicate the number of UL symbols. Resources that are not configured as DL resources and UL resources within the period indicated by dl-UL-TransmissionPeriodicity can be FL resources. A UL subband (e.g., an SBFD subband) can be present (e.g., configured) within DL symbol(s) and / or FL symbol(s). In the time domain, SBFD symbol(s) can be configured based on a combination of the following parameters.

[0131] - Parameter 1: Symbol offset and / or slot offset for UL subband (e.g. SBFD subband)

[0132] The symbol offset (e.g., parameter 1) may be an offset for a start symbol of a UL subband configured within the DL resources and / or FL resources indicated by the TDD common configuration. The slot offset (e.g., parameter 1) may be an offset for a start slot of a UL subband configured within the DL resources and / or FL resources indicated by the TDD common configuration. The base station may explicitly indicate the symbol / slot offset (e.g., parameter 1) to the terminal. The terminal may check the symbol / slot offset indicated by the base station. If the symbol offset is an offset from a slot boundary (e.g., if the reference point of the symbol offset is a slot boundary), the symbol offset may be interpreted as a symbol index. If the slot offset is an offset from a frame (or subframe) boundary (e.g., if the reference point of the slot offset is a frame (or subframe) boundary), the slot offset may be interpreted as a slot index.

[0133] In the UL subband configuration step, an offset (e.g., a symbol / slot offset) for a point at which the UL subband starts (e.g., a startable point) from a specific reference point may be indicated to the terminal. For example, the base station may transmit UL subband configuration information including a symbol / slot offset (e.g., parameter 1) to the terminal. The terminal may receive the UL subband configuration information from the base station and check the symbol / slot offset included in the UL subband configuration information. The reference point for the offset may be a slot or the last symbol in which a channel (e.g., a PDSCH or a PDCCH) including an SBFD operation command is transmitted. Alternatively, it may be a start symbol (e.g., a first symbol) of a UL / DL pattern that is closest to the signaling (e.g., a channel including an SBFD operation command) in the time domain. Alternatively, it may be the slot or the last symbol in which a channel (e.g., PDSCH or PDCCH) containing scheduling information for UL transmission in the SBFD subband is transmitted. Or, it may be the start symbol (e.g., the first symbol) of the UL / DL pattern that is closest to the signaling (e.g., the channel containing scheduling information for UL transmission in the SBFD subband) in the time domain.

[0134] FIG. 10a is a conceptual diagram illustrating a first embodiment of a starting point of a UL subband, and FIG. 10b is a conceptual diagram illustrating a second embodiment of a starting point of a UL subband.

[0135] Referring to FIGS. 10A and 10B, the starting point of a UL subband may be explicitly or implicitly indicated. In the embodiment of FIG. 10A, the starting point of a UL subband may be explicitly indicated. In the embodiment of FIG. 10B, the starting point of a UL subband may be implicitly indicated. A base station may transmit an SBFD operation command indicating activation of an SBFD operation to a terminal. The terminal may receive the SBFD operation command from the base station and determine that the SBFD operation is activated based on the SBFD operation command. The SBFD operation command may be included in an RRC message, a MAC CE, or DCI. The SBFD operation command may be transmitted in a certain UL / DL pattern period, and the starting point of a UL / DL pattern period after the certain UL / DL pattern period (e.g., the earliest UL / DL pattern period) may be a reference point for an offset indicating the starting point of the UL subband. The UL subband may start after the offset from the reference point.

[0136] In the resource configuration step of the UL subband, the base station can transmit information about the reference point and / or information about the offset to the terminal. The terminal can receive information about the reference point and / or information about the offset from the base station. In method A of FIG. 10a, a slot offset for a UL subband can be set in the terminal, and the terminal can determine that the UL subband starts after the slot offset from the starting point of the UL / DL pattern period. In method B of FIG. 10a, a symbol offset for a UL subband can be set in the terminal, and the terminal can determine that the UL subband starts after the symbol offset from the starting point of the UL / DL pattern period. Alternatively, the starting point of the UL subband can be indicated using both a slot offset and a symbol offset.

[0137] In the embodiment of FIG. 10b (e.g., method C), the terminal may determine that the UL subband starts from the start point of the UL / DL pattern period. The start point of the UL subband may be implicitly set. In other words, the slot offset and / or symbol offset indicating the start point of the UL subband may not be set. Only the reference point for the start point of the UL subband may be set in the terminal, and the terminal may estimate the reference point as the start point of the UL subband. For example, if an SBFD operation command is received without setting the start point of the UL subband (e.g., the SBFD subband), the terminal may determine the earliest symbol (e.g., the earliest DL symbol) after the SBFD operation command or the start symbol of the earliest UL / DL pattern (e.g., the first DL symbol) as the start point of the UL subband. Alternatively, the terminal may determine the starting point of the UL subband as a point after X symbol(s) or X slot(s) from the starting point (e.g., starting symbol or starting slot) of the earliest UL / DL pattern after the SBFD operation command. X may be a natural number.

[0138] If DL resources exist before SBFD symbol(s) (e.g., DL resources exist before UL subbands), the terminal may not expect transmissions on SBFD symbol(s) (e.g., UL transmissions on UL subbands) during a specific time interval (e.g., symbol(s)). The specific time interval can be set to the terminal by the base station. The reason for not expecting SBFD transmissions during the specific time interval is to avoid interference between symbols due to propagation delay. In other words, when switching from DL resources to UL resources, the terminal may expect UL transmissions after N symbol(s) from the start UL resource (e.g., the start SBFD symbol). N can be a natural number. The value of N can be set to the terminal by the base station. The above-described operation can be illustrated in FIG. 11 below.

[0139] Figure 11 is a conceptual diagram illustrating an embodiment of UL transmission within a UL subband.

[0140] Referring to FIG. 11, if there are DL symbol(s) before the start symbol of the UL subband, the terminal may not expect to perform UL transmission during the preset UL resources (e.g., N UL symbol(s) and / or N UL slot(s)) from the start symbol of the UL subband (e.g., start SBFD symbol). The base station may not expect the terminal to perform UL transmission in the preset UL resources. The preset UL resources (e.g., N UL symbol(s) and / or N UL slot(s)) may be defined in a technical specification. N may be a natural number. Alternatively, the base station may indicate (e.g., configure) information about the preset UL resources (e.g., N UL symbol(s) and / or N UL slot(s)) to the terminal. The terminal may confirm the preset UL resources based on the indication of the base station. Alternatively, the terminal may transmit information about preset UL resources (e.g., N UL symbol(s) and / or N UL slot(s)) to the base station. The base station may receive information about the preset UL resources from the terminal. Information about the preset UL resources may be included in the UE capability report.

[0141] Alternatively, if there are DL symbol(s) before the start symbol of the UL subband, the terminal may not expect to receive DL transmission during the preset DL resources (e.g., N DL symbol(s) and / or N DL slot(s)) before the start symbol of the UL subband (e.g., SBFD start symbol). The base station may not expect to perform DL transmission on the preset DL resources. The preset DL resources (e.g., N DL symbol(s) and / or N DL slot(s)) may be defined in a technical specification. N may be a natural number. Alternatively, the base station may indicate (e.g., configure) information about the preset DL resources (e.g., N DL symbol(s) and / or N DL slot(s)) to the terminal. The terminal may identify the preset DL resources based on the indication of the base station. Alternatively, the terminal may transmit information about preset DL resources (e.g., N DL symbol(s) and / or N DL slot(s)) to the base station. The base station may receive information about the preset DL resources from the terminal. Information about the preset DL resources may be included in the UE capability report.

[0142] - Parameter 2: Period of the UL subband pattern (e.g., SBFD subband pattern) (e.g., pattern repetition period)

[0143] - Parameter 3: Length of the interval (e.g. duration) of a single UL subband.

[0144] - Parameter 4: Offset between multiple UL subbands within one UL subband pattern.

[0145] Based on parameter 1, the terminal can configure a UL subband based on a symbol offset or slot offset within a DL resource (e.g., a contiguous DL region) configured based on a TDD common configuration. Variables (e.g., parameters) additionally considered for configuring a UL subband in the time domain may include a period of a UL subband pattern (e.g., parameter 2) and / or a length of an interval of a single UL subband (e.g., parameter 3). The period of the UL subband pattern may mean a period in which a single UL subband pattern or multiple UL subband patterns (e.g., UL subband pattern 1, UL subband pattern 2) are repeated. The length of an interval of a single UL subband may mean a interval in which a single UL subband persists in the time domain. The length of an interval of a single UL subband may be expressed by M symbols and / or N slots. Each of M and N may be a natural number. Each of M and N may be defined in a technical specification. Alternatively, the base station may signal information about M and N to the terminal. The terminal may check the values ​​of M and N through the signaling from the base station. Alternatively, the terminal may transmit information about M and N to the base station. The base station may receive information about M and N from the terminal. Information about M and N may be included in the UE capability report.

[0146] Figure 12 is a conceptual diagram illustrating the period of a UL subband pattern and the interval of a UL subband.

[0147] Referring to FIG. 12, one or more UL subbands may be configured within a UL subband pattern. When one UL subband is configured within a UL subband pattern, the period of the UL subband pattern may be interpreted as the period of the UL subband. The interval of the UL subband may be configured in symbol units and / or slot units. The number of UL subbands included in a UL subband pattern may be determined by a repetition factor. An interval (e.g., an offset) between multiple UL subbands within a UL subband pattern may be set to a single value (e.g., the same value). An interval between multiple UL subbands within a UL subband pattern may be configured according to a value of a repetition factor (e.g., the number of UL subbands included in the UL subband pattern). For example, if the repetition factor of UL subband pattern 1 is different from the repetition factor of UL subband pattern 2, the spacing between the plurality of UL subbands within the UL subband pattern 1 may be different from the spacing between the plurality of UL subbands within the UL subband pattern 2. The base station may transmit the spacing (e.g., parameter 4) between the plurality of UL subbands within the UL subband pattern to the terminal through signaling. The terminal may determine the spacing between the plurality of UL subbands within the UL subband pattern through signaling from the base station.

[0148] The length of each section of a plurality of UL subbands may be set to a single value (e.g., the same value). Alternatively, each of the plurality of UL subbands may have different lengths in the time domain. The length of each section of the plurality of UL subbands may be set according to the value of a repetition factor (e.g., the number of UL subbands included in a UL subband pattern). The base station may transmit length information for the section of a UL subband corresponding to each repetition factor to the terminal. The terminal may receive length information for the section of a UL subband corresponding to each repetition factor from the base station. For example, the length of the section of UL subband 1 corresponding to repetition factor 1 may be different from the length of the section of UL subband 2 corresponding to repetition factor 2. Based on the above-described operation, the configuration for UL subbands that may exist in the UL subband pattern may be individually set.

[0149] The UL subband may be repeated until the last symbol of the region in which the UL subband can exist. The region in which the UL subband can exist may be the DL region and / or the FL region. The UL region or "UL region and FL region" may be set as a region in which the UL subband cannot exist.

[0150] Figures 13a, 13b, and 13c are conceptual diagrams illustrating validation rules of UL subbands.

[0151] Referring to FIGS. 13A, 13B, and 13C, multiple UL subbands may be configured within a single UL subband pattern. One or more UL subbands may be configured according to periodicity based on a starting point. The UL subband may be repeated until the region in which the UL subband can exist. In the embodiments of FIGS. 13A, 13B, and 13C, the periods of the UL subband patterns may be the same. Some UL subbands may partially or completely overlap with a UL region. In this case, some UL subbands overlapping with the UL region may or may not be used for UL communication based on a validity rule. A validity rule may be required to determine whether to perform UL communication in a UL subband overlapping with a UL region.

[0152] In the embodiment of FIG. 13a, if there is a UL subband overlapping with a UL region within one UL subband pattern (e.g., one period of the UL subband pattern), the entire UL subband overlapping with the UL region may not be used for UL communication, and the UL subband not overlapping with the UL region within the one UL subband pattern may be used for UL communication.

[0153] In the embodiment of FIG. 13b, if there is a UL subband overlapping with a UL region within one UL subband pattern (e.g., one period of the UL subband pattern), the portion of the UL subband overlapping with the UL region may not be used for UL communication, and the remaining portion of the UL subband may be used for UL communication. In other words, a portion A of the UL subband may overlap with the UL region, and a remaining portion B of the UL subband may not overlap with the UL region. In this case, portion A may be used for UL communication, and portion B may not be used for UL communication. In addition, if there are a UL subband 1 that does not overlap with the UL region and a UL subband 2 that partially overlaps with the UL region within one UL subband pattern, UL subband 1 may be used for UL communication, and based on the method described above, only a portion of the UL subband 2 that does not overlap with the UL region may be used for UL communication.

[0154] In the embodiment of FIG. 13c, if there is a UL subband overlapping with a UL region within one UL subband pattern (e.g., one period of the UL subband pattern), all UL subbands included in the one UL subband pattern may not be used for UL communication.

[0155] The embodiment illustrated in FIG. 13a may be validity rule A, the embodiment illustrated in FIG. 13b may be validity rule B, and the embodiment illustrated in FIG. 13c may be validity rule C. The base station may inform the terminal of one validity rule to be used among multiple validity rules through signaling. The terminal may confirm one validity rule to be used through signaling from the base station. Alternatively, the terminal may inform the base station of one validity rule to be used among multiple validity rules through signaling. The base station may confirm one validity rule to be used through signaling from the terminal. The base station and / or the terminal may confirm a valid UL subband based on the validity rule. The UL subband pattern and / or the period of the UL subband pattern may be associated with the number of transitions from DL resources to UL resources and / or the number of transitions from UL resources to DL resources.

[0156] Among the valid SBFD symbols set in the DL region and / or the FL region, consecutive SBFD symbols may be referred to as candidate SBFD occasions. The valid SBFD symbols may be SBFD symbols that satisfy the validity rule among the SBFD symbols belonging to the SBFD subband (e.g., the UL subband). The base station and / or the terminal may be expected to perform SBFD operations (e.g., DL communication and / or UL communication according to the SBFD operation) in the candidate SBFD occasions.

[0157] - Proposal #1

[0158] In Proposal #1, the base station can configure resources for UL subbands in the time domain based on one or a combination of parameters among the parameters described above (e.g., parameters 1 to 4). The terminal and / or the base station can be expected to perform SBFD operations (e.g., DL communication and / or UL communication according to SBFD operation) in all candidate SBFD occasions.

[0159] - Proposal #2

[0160] In Proposal #2, the base station can configure resources for UL subbands in the time domain based on one or a combination of parameters among the above-described parameters (e.g., parameters 1 to 4). The terminal and / or the base station can be expected to perform SBFD operations (e.g., DL communication and / or UL communication according to SBFD operation) in some candidate SBFD occasions among all candidate SBFD occasions.

[0161] FIG. 14a, FIG. 14b, FIG. 14c, FIG. 14d, and FIG. 14e are conceptual diagrams illustrating embodiments of setting UL subbands.

[0162] Referring to FIGS. 14A to 14E, multiple UL subbands may be configured within one UL subband pattern. For example, one UL subband pattern may include Q UL subbands. Q may be a natural number. In the embodiments of FIGS. 14A to 14E, UL subbands (e.g., all UL subbands) may be candidate UL subbands. In the embodiments of FIGS. 14A to 14E, the periods of the UL subband patterns may be the same. The UL subband pattern may be maintained for P cycles. P may be a natural number. As the values ​​of P and / or Q increase, the signaling overhead for configuring the UL subband may increase. Among the UL subbands, the UL subband(s) on which communication according to the SBFD operation is performed may be configured (e.g., indicated) based on the following proposal.

[0163] - Proposal #2-1: The on / off of a UL subband can be set in units of cycles. The embodiment of Fig. 14b can be a configuration of a UL subband based on Proposal #2-1.

[0164] A base station can indicate specific cycle(s) for a UL subband pattern to a terminal through signaling. The specific cycle(s) indicated by the base station may be cycle(s) in which an SBFD operation is performed. A terminal can identify the specific cycle(s) indicated by the base station through signaling. The terminal and / or the base station may expect that the SBFD operation is performed in the specific cycle(s) indicated by the base station. If the base station indicates cycle #p, the terminal and / or the base station may expect that the SBFD operation is performed in cycle #p. p may be a natural number. The information indicating the specific cycle(s) may be a bitmap. A cycle index may be mapped one-to-one to bits in the bitmap. The cycle index may be mapped to bits in the bitmap in descending or ascending order. The base station can use the bitmap to turn on or off one or more cycles. A cycle that is in an on state may be a cycle in which an SBFD operation is performed. An off-state cycle may be a cycle in which an SBFD operation is not performed. The cycle index in decimal form may be converted to a binary value. The base station may inform the terminal that one or more SBFD occasions corresponding to a single cycle index are used for the SBFD operation. The terminal may determine that one or more SBFD occasions corresponding to a single cycle index are used for the SBFD operation based on an instruction (e.g., configuration) from the base station.

[0165] - Proposal #2-2: The on / off of UL subbands can be set in repetition units. The embodiment of Fig. 14c can be a setting of UL subbands based on Proposal #2-2.

[0166] Based on Proposal #2-2, candidate SBFD occasions belonging to a single UL subband pattern or a single cycle can be independently configured. The positions of SBFD occasions (e.g., candidate SBFD occasions) used for SBFD operation in UL subband patterns can be the same. The signaling scheme for Proposal #2-2 can be the same or similar to the signaling scheme for Proposal #2-1 described above. For example, the base station can transmit information indicating whether repetition Q of a UL subband is turned on to the terminal through signaling. The terminal can determine that repetition Q of the UL subband is turned on through the signaling of the base station. The terminal and / or the base station can determine that the SBFD operation is performed on the UL subband (e.g., SBFD occasion) associated with the repetition Q that is turned on.

[0167] - Proposal #2-3: The on / off of UL subbands can be set by a combination of cycle units and repetition units. The embodiment of Fig. 14d may be a UL subband setting based on Proposal #2-3.

[0168] Proposal #2-3 may be a combination of Proposal #2-1 and Proposal #2-2. The SBFD occasion(s) where the SBFD operation is performed may be configured (e.g., indicated) based on a hierarchical structure. For example, an environment may be assumed in which there are four cycles for a UL subband, and each cycle has two repetitions. In the above environment, the base station may transmit on / off information for the cycle (e.g., 0100) and on / off information for the repetition (e.g., 10) to the terminal through signaling. The terminal may receive on / off information for the cycle (e.g., 0100) and on / off information for the repetition (e.g., 10) through signaling from the base station. In the on / off information, 0 may indicate that the cycle or repetition mapped to 0 is in an off state. In the on / off information, 1 may indicate that the cycle or repetition mapped to 1 is in an on state. Based on the above signaling, the terminal and / or base station may determine that the SBFD operation is performed at the SBFD occasion (e.g., candidate SBFD occasion) associated with the first iteration within the second cycle.

[0169] - Proposal #2-4: One or more SBFD occasions where SBFD operation is performed can be indicated by explicit signaling considering all candidate SBFD occasions. The embodiment of Fig. 14e can be a configuration of UL subbands based on Proposal #2-4.

[0170] A bitmap for all candidate SBFD occasions can be set. All candidate SBFD occasions can be indexed in chronological order with respect to a starting candidate SBFD occasion. A bitmap for the indices of all candidate SBFD occasions can be set. If there are P cycles and Q repetitions within each cycle, the size of the bitmap can be P×Q bits. A bit set to 0 in the bitmap can indicate that the SBFD occasion associated with the bit is in an off state. A bit set to 1 in the bitmap can indicate that the SBFD occasion associated with the bit is in an on state. A base station can set a bitmap indicating one or more SBFD occasions on which an SBFD operation is performed, and can transmit the bitmap to a terminal via signaling. The terminal can receive the bitmap via signaling from the base station. The terminal and / or the base station can determine that the SBFD operation is performed in one or more SBFD occasions indicated by the bitmap. The signaling overhead of Proposal #2-4 may be greater than that of other proposals. When the number of cycles and / or iterations is small, Proposal #2-4 may be an efficient method.

[0171] - Proposal #3

[0172] Regardless of the TDD common configuration and / or the TDD-only configuration, the base station can configure SBFD resources (e.g., SBFD subband, UL subband) in the time domain using at least one parameter from parameters 1 to 4. The terminal can check the SBFD resources indicated by the base station. The terminal can check the SBFD resource(s) that satisfy the validity rule among all SBFD resources indicated by the base station, and can expect the performance of the SBFD operation (e.g., UL communication and / or DL ​​communication according to the SBFD operation) on the identified SBFD resource(s). The base station can expect that the SBFD operation is performed on the SBFD resource(s) that satisfy the validity rule among all SBFD resources. The SBFD resource(s) that satisfy the validity rule among all SBFD resources may be SBFD resource(s) belonging to the DL region and / or FL region configured by the TDD common configuration and / or the TDD-only configuration. Alternatively, the base station may configure (e.g., instruct) the terminal to select some SBFD resources on which the SBFD operation is performed among all SBFD resources based on Proposal #2. The terminal may identify some SBFD resources on which the SBFD operation is performed based on the configuration (e.g., instruct) of the base station.

[0173] - Proposal #4

[0174] The maximum number of UL / DL patterns supported by the base station can be 2. For example, the base station can configure UL / DL pattern 1 to the terminal. Or, the base station can configure UL / DL pattern 1 and UL / DL pattern 2 to the terminal. UL / DL pattern 2 can start from the end time of UL / DL pattern 1. UL / DL pattern 1 and UL / DL pattern 2 can have different periodicities. The configuration of UL / DL resources in UL / DL pattern 1 can be different from the configuration of UL / DL resources in UL / DL pattern 2. In terms of flexibility, the base station can configure a UL subband pattern corresponding to each UL / DL pattern. The parameter(s) and / or signaling for configuring the UL subband pattern can be identical to the parameter(s) and / or signaling for configuring the UL / DL pattern. To avoid increasing signaling overhead, the rules for the time domain of the UL subband applied to UL / DL pattern 1 can be equally applied to UL / DL pattern 2 (e.g., the UL subband applied to UL / DL pattern 2).

[0175] - Proposal #5

[0176] FL resources (e.g., FL symbols and / or FL slots) configured by TDD common configurations can be reconfigured (e.g., overridden) into UL resources or DL ​​resources by TDD-specific configurations. Configurations (e.g., rules, validity rules) for candidate SBFD occasions can be applied by default to DL resources configured by TDD common configurations, and the configurations for the candidate SBFD occasions can be extended to resources (e.g., reconfigured resources) that have been changed from FL resources to DL resources by TDD-specific configurations. This operation can be applied when the priority of a UL subband is higher than that of a DL resource (e.g., a general DL resource). Depending on the type (e.g., DL, UL, or FL) of a resource (e.g., a symbol) prior to the FL resource, a UL subband can be configured in a resource that has been changed from an FL resource to a DL resource. For example, if the symbol preceding the FL resource is an SBFD symbol, for continuity of SBFD transmission, the SBFD symbol may be set (e.g., allocated) to a resource that has changed from the FL resource to a DL resource. If the symbol preceding the FL resource is not an SBFD symbol, the SBFD symbol may be restricted from being set to a resource that has changed from the FL resource to a DL resource. Whether or not to perform the SBFD operation on the FL resource may be determined according to specific conditions.

[0177] Setting the frequency domain of SBFD resources (e.g., UL subband, SBFD subband)

[0178] The maximum number of UL subbands for SBFD operation in an SBFD symbol within a TDD carrier can be 1. The UL subbands can be located on one side of the carrier. Alternatively, the UL subbands can be located in the center portion of the carrier. For a quasi-static indication of the frequency location of the SBFD subbands, the following options may be considered.

[0179] - Option 1: The frequency locations of the UL subband and DL subband(s) can be explicitly set. The guard band(s) can be implicitly derived from RB(s) that do not belong to the UL subband or DL ​​subband(s).

[0180] - Option 2: The locations of UL subbands and the number of RBs for guard band(s) can be explicitly set. DL subband(s) can be implicitly derived from RB(s) that do not belong to UL subbands or guard band(s).

[0181] Subband frequency-domain resources may be identical across different SBFD symbols within a TDD carrier. When DL subband(s) are explicitly indicated, the frequency locations of cell-specific UL subbands may be indicated relative to the common resource block (CRB) grid. RB-level granularity may be supported for semi-static indication of the frequency locations of SBFD subbands.

[0182] Frequency resources of UL subbands within an active UL BWP may be referred to as UL available PRBs. Frequency resources of DL subband(s) within an active DL BWP may be referred to as DL available PRBs.

[0183] To determine the available PRBs for UL / DL, the following options may be considered:

[0184] - Option 1: UL available PRBs can be determined as the intersection between cell-specific UL subbands and active UL BWPs in SBFD symbols. DL available PRBs can be determined as the intersection between cell-specific DL subband(s) and active DL BWPs in SBFD symbols.

[0185] - Option 2: UL / DL available PRBs can be explicitly set in the active UL / DL BWP within the SBFD symbols.

[0186] A terminal supporting SBFD operation may not expect to perform communications (e.g., UL communications and / or DL ​​communications) in the guard band existing between the DL subband and the UL subband. The frequency locations of the SBFD subbands may be set based on the CRB grid. To reduce implementation complexity, the frequency locations of the SBFD subbands in adjacent SBFD symbols may be set to be the same. The frequency locations of the UL subbands may be set based on the following method(s).

[0187] The base station can inform the terminal of the size information of the UL subband (e.g., the number of PRBs and / or the number of SCs (subcarriers)) through signaling. The terminal can receive the size information of the UL subband through signaling from the base station. The base station can inform the terminal of "that in the frequency domain, the UL subband (e.g., the reference PRB of the UL subband) is configured to the PRB(s) or SC(s) above the lowest PRB of the BWP", "that in the frequency domain, the UL subband (e.g., the reference PRB of the UL subband) is configured to the PRB(s) or SC(s) below the highest PRB of the BWP", or "that in the frequency domain, the UL subband is configured in both directions based on the center of the BWP". The terminal can receive the above-described information (e.g., the configuration of the UL subband) through signaling from the base station. A 2-bit indicator may be used to signal the above-described information. The reference PRB may be the lowest PRB, the highest PRB, or the center PRB of the UL subband.

[0188] A guard band may exist in SBFD symbols. The configuration of the guard band (e.g., size, location) may be defined in the technical specification. Alternatively, the base station may transmit the guard band configuration to the terminal through signaling. The terminal may receive the guard band configuration through signaling from the base station. Information indicating the presence or absence of the guard band may be transmitted together with the guard band configuration. The base station may transmit a PRB offset based on the CRB to the terminal. The PRB offset may be used to indicate a reference PRB (e.g., the lowest PRB, the starting PRB) of the UL subband. The PRB offset may be the offset between the reference PRB of the UL subband and the lowest RB (or the highest RB) of the CRB.

[0189] If a UL subband is configured in the center portion of a carrier (or BWP, CRB), the UL subband may collide with SSB resources. Considering the collision issue, the base station may configure the UL subband in the edge portion of the carrier (or BWP, CRB). The terminal may receive the UL subband configuration from the base station. The terminal may ignore the UL subband configuration for a slot including SSB transmission and may expect to receive SSB transmission in the slot. If part or all of the UL subband overlaps with SSB resources, the terminal may not expect UL transmission in the entire UL subband. Alternatively, if part of the UL subband overlaps with SSB resources, the terminal may expect UL transmission in the remaining portion of the UL subband that does not overlap with the SSB resources. Alternatively, the terminal may perform UL transmission after a time gap from a resource that overlaps with the SSB resource within the UL subband. When resources for SSB transmission overlap with UL subbands, the base station can expect the above-described operations to be performed. The above-described operations can be performed because the priority of SSB transmission (e.g., synchronization) is higher than that of UL transmission.

[0190] Instructions for UL subbands

[0191] At least the configuration of the time resource and / or frequency resource of the UL subband can be performed based on a cell-specific configuration (e.g., cell-specific signaling) and / or a UE-specific configuration (e.g., UE-specific configuration). Based on the UE-specific configuration, the FL resource can be configured as a DL resource. Since the UL subband can be configured in the DL resource (e.g., SBFD symbol), the UL subband can be configured based on the UE-specific configuration as well as the cell-specific configuration. A slot format indicator (SFI) can be used to configure a UL / DL pattern. In the step of configuring a UL / DL pattern using an SFI, if a UL subband exists in a previous DL resource (e.g., SBFD symbol), the base station can transmit to the terminal an SFI including information (e.g., indication information) indicating whether to use (e.g., configure) the UL subband in the resource changed from the FL resource to the DL resource. The terminal can receive SFI from the base station and check information (e.g., instruction information) included in the SFI.

[0192] For example, if the instruction information included in the SFI indicates an on state and the FL resource is changed to a DL resource, the UL subband set in the DL resource before the FL resource can be utilized as a UL subband until the pattern (e.g., UL / DL pattern, UL subband pattern) ends within the same frequency resource of the DL resource.

[0193] A base station can set a guard band for each terminal. The guard band configuration (e.g., size, location) can be independent for each terminal. Candidate values ​​for the guard band configuration can be defined in the technical specifications. Alternatively, the base station can set (e.g., instruct) candidate values ​​for the guard band configuration to the terminal through signaling (e.g., RRC message) and transmit a signaling message (e.g., MAC CE or DCI) containing information indicating one of the candidate values ​​to the terminal. The terminal can confirm one of the candidate values ​​for the guard band configuration through the signaling.

[0194] The configuration information of cell-specific resources can be transmitted through a system information block (SIB). The periodicity of the UL subband in the time domain can be the same as the periodicity of the UL / DL pattern configured by the TDD common configuration. If the UL subband is rarely utilized, the UE can increase the periodicity of the UL subband. For example, the UE can increase the periodicity of the UL subband by n times. n can be a natural number. In this case, the UL subband can be configured intermittently in the time domain. Information about n can be included in the configuration information of the UL subband. If two UL / DL patterns are configured by the TDD common configuration, the periodicity of the UL subband can be configured as the sum of the periodicity of UL / DL pattern 1 (p1) and the periodicity of UL / DL pattern 2 (p2). Alternatively, the periodicity of the UL subband can be configured as mX(p1+p2). m can be a natural number. The information about the above m may be included in the configuration information of the UL subband and / or the configuration information of the UL / DL pattern.

[0195] In the time domain, the start and end points of UL subbands can be set using one or a combination of the following methods. For example, the base station can transmit information according to each method to the terminal via signaling. The terminal can identify the start and end points of the UL subband based on the information received via the base station signaling, and can set the UL subband based on the start and end points.

[0196] - Method 1: Start symbol and length of UL subband

[0197] - Method 2: Start and end symbols of UL subband

[0198] - Method 3: Slot(s) for UL subband (e.g., slot(s) in which UL subband is configured), start symbol, length, and / or end symbol of UL subband within said slot(s).

[0199] - Method 4: N(non)-UL subbands (e.g., N-SBFD symbols) can be configured in the same or similar manner as Method 3, and subbands other than the N-UL subbands can be determined (e.g., configured) as UL subbands. The N-UL subbands can be DL subbands and / or FL subbands.

[0200] - Method 5: Number of slots and / or number of symbols for consecutive UL subbands (e.g., SBFD subbands). Slots can be set (e.g., indexed) based on the first slot of the UL / DL pattern. Symbols can be set (e.g., indexed) based on the first symbol of the UL / DL pattern. Alternatively, symbols can be set (e.g., indexed) based on the end symbol of a slot (e.g., the first slot of the UL / DL pattern).

[0201] - Method 6: The N-UL subband can be set in the same or similar manner as Method 5, and subbands other than the N-UL subband can be determined (e.g., set) as UL subbands.

[0202] The base station can transmit the guardband configuration between the UL subband and the N-UL subband to the terminal via signaling (e.g., cell-specific signaling). The terminal can receive the guardband configuration via signaling from the base station. Alternatively, the guardband configuration can be defined in a technical specification. Alternatively, the guardband can be configured for the terminal via UE-specific signaling. The guardband can be configured independently, taking into account the capabilities of the terminal. When the guardband is configured via UE-specific signaling, resource efficiency can be improved.

[0203] The base station can transmit frequency configuration information of the UL subband to the terminal through signaling. The terminal can obtain frequency configuration information of the UL subband through signaling from the base station. For example, the base station can configure (e.g., instruct) the terminal the number of RBs of the UL subband, configure (e.g., instruct) the terminal the start and / or end points of the UL subband in the frequency domain, and configure consecutive RBs as the UL subband.

[0204] A base station can transmit information about a starting point (e.g., a starting position) of a UL subband in the frequency domain to a terminal through signaling. The terminal can obtain information about the starting point of the UL subband in the frequency domain through signaling from the base station. The starting point of the UL subband can be the lowest PRB within a BWP, the highest PRB within the BWP, or a center PRB of the BWP. Alternatively, the starting point of the UL subband can be limited to the lowest PRB within the BWP or the highest PRB within the BWP. In this case, the base station can use a 1-bit indicator to inform the terminal of the starting point of the UL subband in the frequency domain. A first bit indicator set to a first value (e.g., 0) can indicate that the starting point of the UL subband is the lowest PRB within the BWP. A first bit indicator set to a second value (e.g., 1) can indicate that the starting point of the UL subband is the highest PRB within the BWP.

[0205] Alternatively, the starting point of a UL subband may be restricted to the lowest PRB within a BWP or the center PRB of the BWP. Alternatively, the starting point of a UL subband may be restricted to the highest PRB within a BWP or the center PRB of the BWP. In this case, the base station may use a 1-bit indicator to inform the UE of the starting point of the UL subband (e.g., "the lowest PRB or center PRB" or "the highest PRB or center PRB"). If the UL subband starts from the center PRB of the BWP, the upper p PRB(s) from the center PRB and the lower k PRB(s) from the center PRB may be configured as the UL subband. Each of p and k may be a natural number. p and k may have the same value or different values.

[0206] RB information (e.g., PRB information) may indicate frequency resources of a DL subband and / or frequency resources of a UL subband. The base station may transmit the RB information to the terminal through signaling. The terminal may obtain the RB information through signaling of the base station. If the RB information indicates the number of RBs for a DL subband, the terminal may assume that RBs excluding the DL subband, the guard band defined in the technical specification, and / or the guard band configured by the base station, among all RBs (e.g., all RBs belonging to a BWP), are UL subbands. Alternatively, if the RB information indicates the number of RBs for a UL subband, the terminal may assume that RBs excluding the UL subband, the guard band defined in the technical specification, and / or the guard band configured by the base station, are DL subbands. Alternatively, if the RB information indicates the number of RBs for the DL subband and the UL subband, the terminal may assume the RBs between the DL subband and the UL subband as guard bands.

[0207] A base station can set (e.g., instruct) a terminal via signaling information about a reference SCS for setting a UL subband and / or a DL subband. The terminal can receive information about the reference SCS via signaling from the base station. The terminal and / or the base station can determine a start point and / or an end point of the DL subband and / or the UL subband according to an offset (e.g., an offset in units of RB) set based on the reference SCS. The start RB (e.g., the reference RB) of the offset can be the same as the start RB of the BWP. In this case, a separate reference RB does not need to be set. For common setting for multiple BWPs, CRB0 can be set (e.g., considered) as the reference RB.

[0208] Tx / Rx measurement procedure

[0209] A UL usable PRB may be a PRB on which a terminal can perform UL transmission. The UL usable PRB may be set on a PRB basis. A DL usable PRB may be a PRB on which a terminal can perform DL reception. The DL usable PRB may be set on a PRB basis. The UL usable PRB and the DL usable PRB may be implicitly set based on the UL subband and / or DL ​​subband set based on the above-described instructions.

[0210] Guard periods and / or guard bands can be used as UL-available PRBs and DL-available PRBs. When UL subbands and N-UL subbands coexist within a single slot (e.g., when SBFD symbol(s) exist), considering interference with other terminals and / or performance degradation, the terminal may not expect all DL reception or all UL transmissions in the entire slot. When a gap exists in the time domain, the terminal may expect DL reception in DL resources and / or UL transmission in UL resources. The gap may have a length defined in the technical specification (e.g., length in symbol units or length in time units). The gap may mean a time gap.

[0211] Figure 15 is a flowchart illustrating a UL communication method in a UL subband.

[0212] Referring to FIG. 15, a base station may generate SBFD configuration information (S1501). The SBFD configuration information may include configuration information for a UL subband configured in a DL section within the time domain. The SBFD configuration information may include at least one of an index of a start slot of a UL subband, an index of a start symbol of the UL subband within the start slot, an index of an end slot of the UL subband, or an index of an end symbol of the UL subband within the end slot. The index may be interpreted as an offset with respect to a reference point. For example, when the reference point is a subframe or frame boundary, the slot offset may be interpreted as a slot index. When the reference point is a slot boundary, the symbol offset may be interpreted as a symbol index.

[0213] The base station can transmit SBFD configuration information to the terminal through signaling (S1502). The SBFD configuration information can be included in TDD-UL-DL-configuration common information (e.g., TDD-UL-DL-ConfigCommon). The SBFD configuration information can be included in TDD-UL-DL-pattern information (e.g., TDD-UL-DL-Pattern) included in the TDD-UL-DL-configuration common information. The TDD-UL-DL-configuration common information (e.g., TDD-UL-DL-pattern information) can indicate a DL section and / or an UL section. A section that is not indicated as a DL section or an UL section by the TDD-UL-DL-configuration common information (e.g., TDD-UL-DL-pattern information) can be an FL section. In the present disclosure, the signaling can be at least one of SI (system information) signaling (e.g., SIB1), RRC signaling, MAC CE signaling, or DCI signaling.

[0214] In S1502, the terminal can receive SBFD configuration information from the base station. The terminal can check the information included in the SBFD configuration information and can configure (e.g., check) the UL subband based on the checked information. For example, the terminal can check the starting point of the UL subband in the DL interval in the time domain based on the index of the starting slot of the UL subband included in the SBFD configuration information and / or the index of the starting symbol of the UL subband within the starting slot. The terminal can check the ending point of the UL subband in the DL interval in the time domain based on the index of the ending slot of the UL subband included in the SBFD configuration information and / or the index of the ending symbol of the UL subband within the ending slot.

[0215] Additionally, the base station can identify the starting point of the UL subband in the DL interval in the time domain based on the index of the starting slot of the UL subband included in the SBFD configuration information and / or the index of the starting symbol of the UL subband within the starting slot. The base station can identify the ending point of the UL subband in the DL interval in the time domain based on the index of the ending slot of the UL subband included in the SBFD configuration information and / or the index of the ending symbol of the UL subband within the ending slot.

[0216] In S1503, the terminal can check a valid UL transmission interval within the UL subband. In other words, the terminal can determine the validity of the UL subband. If a DL transmission (e.g., SSB transmission) of a base station is performed within the UL subband, the terminal can check the interval after the DL transmission (e.g., SSB transmission) within the UL subband as a valid UL transmission interval. The DL transmission may be a DL transmission having a higher priority than the UL transmission. If a DL transmission having a lower priority than the UL transmission is performed within the UL subband, the terminal can perform the UL transmission within the UL subband regardless of the DL transmission.

[0217] The terminal can perform UL communication with the base station during a valid UL transmission interval (S1504). The terminal can perform UL communication after a time gap from the base station's SSB transmission (e.g., DL transmission with a high priority). The base station can expect to perform UL communication with the terminal after a time gap from the SSB transmission (e.g., DL transmission with a high priority). The time gap can be set to the terminal by signaling from the base station. The time gap can be set on a symbol-by-symbol basis or a slot-by-slot basis. Alternatively, if at least one resource for the base station's SSB transmission overlaps with a UL subband, the terminal can determine the entire UL subband as an invalid UL transmission interval and drop UL communication (e.g., UL transmission) in the UL subband. In other words, the terminal can perform UL communication in a UL subband that does not overlap with at least one resource for SSB transmission. A UL subband that does not overlap with at least one resource for SSB transmission may be a valid UL transmission interval. SSBs may be classified into SSBs with a high priority and SSBs with a low priority. If an SSB transmission with a lower priority than UL transmission is performed within a UL subband, the terminal may perform the UL transmission within the UL subband regardless of the SSB transmission.

[0218] Within a UL subband, UL communication may be performed after a time gap from the last N-SBFD symbol (e.g., a DL symbol, an UL symbol, or an FL symbol). A base station and / or a terminal may expect that UL communication within a UL subband is performed after a time gap from the last N-SBFD symbol. The N-SBFD symbol may be located before the UL subband, and the period after the time gap from the N-SBFD symbol within the UL subband may be identified as a valid UL transmission period. The time gap may be set to the terminal by signaling from the base station. The time gap may be set on a symbol-by-slot basis or a slot-by-slot basis.

[0219] The UL communication performed in S1504 may be a grant-based UL transmission, a configured grant (CG)-based UL transmission, or a random access (RA) preamble transmission (e.g., msg1 transmission and / or msgA transmission). An RO (RACH (random access channel) occasion) for RA preamble transmission may be configured within a UL subband. The base station may transmit information to the terminal through signaling indicating whether to allow RO configuration within the UL subband. If RO configuration within the UL subband is allowed, an RO located within the UL subband may be determined as a valid RO. If RO configuration within the UL subband is not allowed, an RO located within the UL subband may be determined as an invalid RO. Regardless of the configuration of the base station, an RO configured within the UL subband may be determined as a valid RO or an invalid RO. RA preamble transmission may be performed in a valid RO. RA preamble transmission may not be performed in an invalid RO.

[0220] When a UL transmission of a terminal and a DL transmission of a base station collide within a UL subband, a transmission (e.g., UL transmission or DL ​​transmission) having a higher priority may be performed based on the priority of the UL transmission and the priority of the DL transmission. When the UL transmission has a higher priority than the DL transmission, the UL subband associated with the UL transmission may be determined to be a valid UL transmission interval. When the UL transmission has a lower priority than the DL transmission, the UL subband associated with the UL transmission may be determined to be an invalid UL transmission interval. Alternatively, when the UL transmission has a lower priority than the DL transmission, an interval overlapping with the DL transmission within the UL subband associated with the UL transmission may be determined to be an invalid UL transmission interval. The DL transmission may be an SSB transmission, a grant-based DL transmission, or a SPS (semi-persistent scheduling) DL transmission. The priority of the UL transmission within the UL subband may be lower than the priority of the SSB transmission. Within a UL subband, the priority of UL transmission may be higher than the priority of DL transmission or SPS DL transmission.

[0221] The base station can identify valid UL transmission intervals within the UL subband in the same or similar manner as the terminal described above. The base station can expect to perform UL communication with the terminal during valid UL transmission intervals within the UL subband. The base station can expect not to perform UL communication with the terminal during invalid UL transmission intervals within the UL subband.

[0222] In the present disclosure, configuration information for UL subbands can be transmitted via RRC signaling. The configuration information for UL subbands can be transmitted after transmission of TDD configuration information. The operations according to the present disclosure can be applied not only to licensed spectrum but also to unlicensed spectrum and / or other spectrums. The operations according to the present disclosure can be extended to determine and / or control transmission power for the sidelink and / or transmission power for the UL link in the supplementary uplink (SUL).

[0223] In this disclosure, a terminal may transmit information indicating whether it supports the function(s) proposed in this disclosure to a base station. The information indicating whether it supports the function(s) may be included in a UE capability report. The base station may receive the UE capability report from the terminal and perform signaling and / or operations based on information included in the UE capability information (e.g., information indicating whether it supports the function(s)).

[0224] The operations of the method according to the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes any type of recording device that stores information readable by a computer system. Furthermore, a computer-readable recording medium can be distributed across network-connected computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0225] Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

[0226] While some aspects of the present disclosure have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one or more of the most significant method steps may be performed by such a device.

[0227] A programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described in the present disclosure. The field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in the present disclosure. In general, the methods are preferably performed by some hardware device.

[0228] Although the present disclosure has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

Claims

1. As a method of UE (user equipment), A step of receiving SBFD (subband full duplex) setting information from a base station; A step of confirming a UL (uplink) subband set in a DL (downlink) section within the time domain based on information included in the above SBFD setting information; and Comprising a step of performing UL communication with the base station after DL transmission of the base station within the UL subband, UE's method.

2. In claim 1, The above UL communication is performed after a time gap from the above DL transmission. UE's method.

3. In claim 2, The above DL transmission is a SSB (synchronization signal block) transmission. UE's method.

4. In claim 2, The above time gap is set to the UE by the base station, UE's method.

5. In claim 2, The above time gap is set in symbol units, UE's method.

6. In claim 1, The UL communication is performed in the UL subband that does not overlap with at least one resource for the DL transmission, and the DL transmission is an SSB transmission. UE's method.

7. In claim 1, The above UL communication is the transmission of an RA (random access) preamble, and the RO (RACH (random access channel) occasion) for transmission of the RA preamble is set within the UL subband. UE's method.

8. In claim 1, Within the above UL subband, the UL communication is performed after a time gap from the last N(non)-SBFD symbol. UE's method.

9. In claim 1, The above UL communication is a grant-based UL transmission or a CG (configured grant)-based UL transmission, and the UL communication is performed in an available resource that does not overlap with the DL transmission of the base station within the UL subband. UE's method.

10. In claim 1, If the UL subband overlaps with at least one resource for SPS (semi-persistent scheduling) DL (downlink) transmission, and the priority of the UL communication is higher than the priority of the SPS DL transmission, the UL communication is performed within the UL subband. UE's method.

11. As a method of base station, Step for generating SBFD (subband full duplex) setting information; A step of transmitting the above SBFD setting information to UE (user equipment); A step of confirming a UL (uplink) subband set in a DL (downlink) section within the time domain based on information included in the above SBFD setting information; and Comprising a step of performing UL communication with the UE after DL transmission of the base station within the UL subband, Base station method.

12. In claim 11, The above UL communication is performed after a time gap from the above DL transmission. Base station method.

13. In claim 12, The above DL transmission is a SSB (synchronization signal block) transmission. Base station method.

14. In claim 12, The above time gap is set to the UE by the base station, Base station method.

15. In claim 12, The above time gap is set in symbol units, Base station method.

16. In claim 11, The UL communication is performed in the UL subband that does not overlap with at least one resource for the DL transmission, and the DL transmission is an SSB transmission. Base station method.

17. In claim 11, The above UL communication is the transmission of an RA (random access) preamble, and the RO (RACH (random access channel) occasion) for transmission of the RA preamble is set within the UL subband. Base station method.

18. In claim 11, Within the above UL subband, the UL communication is performed after a time gap from the last N(non)-SBFD symbol. Base station method.

19. In claim 11, The above UL communication is a grant-based UL transmission or a CG (configured grant)-based UL transmission, and the UL communication is performed in an available resource that does not overlap with the DL transmission of the base station within the UL subband. Base station method.

20. In claim 11, If the UL subband overlaps with at least one resource for SPS (semi-persistent scheduling) DL (downlink) transmission, and the priority of the UL communication is higher than the priority of the SPS DL transmission, the UL communication is performed within the UL subband. Base station method.

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