Method and apparatus for random access procedure in SBFD subband

Abstract

A method and an apparatus for a random access procedure in an SBFD subband are disclosed. The method of a user equipment (UE) comprises the steps of: receiving random access channel (RACH) configuration information from a base station; determining, on the basis of the RACH configuration information indicating repeated transmission of a random access (RA) preamble, an RACH occasion (RO) type in which the repeated transmission of the RA preamble is performed; and performing the repeated transmission for the RA preamble in an RO corresponding to the RO type.

Description

Method and device for random access procedure in SBFD subband

[0001] The present disclosure relates to improved communication technology, and more particularly to a technology for random access procedures 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, an uplink (UL) subband may be configured in a downlink (DL) section. The UL subband configured in the DL section may be used for a random access procedure. Methods for performing a random access procedure in the UL subband (e.g., a synchronization signal block (SSB)-RO (random access channel (RACH) occasion) mapping rule, RACH power control, etc.) may be required.

[0005] The purpose of the present disclosure to solve the above problems is to provide a method and device for a random access procedure 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 random access channel (RACH) configuration information from a base station; determining an RO (RACH occasion) type in which repeated transmission of the RA preamble is performed based on the RACH configuration information indicating repeated transmission of the RA preamble; and performing repeated transmission of the RA preamble in an RO corresponding to the RO type.

[0007] The above RO type may be SBFD (subband full duplex) RO (RACH occasion) or legacy RO, and the UE supporting SBFD operation may determine the RO type as the SBFD RO.

[0008] Repeated transmission for the above RA preamble may be performed in one of the RO types, either the SBFD RO or the legacy RO, and repeated transmission for the above RA preamble may not be performed across the SBFD RO and the legacy RO.

[0009] The above RACH configuration information may include SBFD RACH configuration information and legacy RACH configuration information, the SBFD RACH configuration information may include information for an SBFD RA procedure of a UE that supports an SBFD operation, and the legacy RACH configuration information may include information for a legacy RA procedure of a UE that does not support the SBFD operation.

[0010] Each of the above SBFD RACH configuration information and the above legacy RACH configuration information may include at least one of one or more RSRP (reference signal received power) thresholds used to determine the number of repeated transmissions of the RA preamble or the number of repeated transmissions of the RA preamble.

[0011] The one or more RSRP thresholds for the SBFD RA procedure can be set independently from the one or more RSRP thresholds for the legacy RA procedure.

[0012] The number of repetition transmissions for the above SBFD RA procedure can be set independently from the number of repetition transmissions for the above legacy RA procedure.

[0013] The above number of repetition transmissions can be applied equally to the above SBFD RA procedure and the above legacy RA procedure.

[0014] According to embodiments of the present disclosure for achieving the above object, a method of a base station includes the steps of: generating RACH (random access channel) configuration information; transmitting the RACH configuration information to a UE (user equipment); and receiving the RA preamble from the UE in a subband full duplex (SBFD) RO (RACH occasion) or legacy RO in which repeated transmission of the RA preamble is performed, based on the RACH configuration information indicating repeated transmission of the RA preamble.

[0015] Based on the UE supporting SBFD operation, the RA preamble may be expected to be received in the SBFD RO, and repeat transmissions for the RA preamble may not be received across the SBFD RO and the legacy RO.

[0016] The above RACH configuration information may include SBFD RACH configuration information and legacy RACH configuration information, the SBFD RACH configuration information may include information for an SBFD RA procedure of a UE that supports an SBFD operation, and the legacy RACH configuration information may include information for a legacy RA procedure of a UE that does not support the SBFD operation.

[0017] Each of the above SBFD RACH configuration information and the above legacy RACH configuration information may include at least one of one or more RSRP (reference signal received power) thresholds used to determine the number of repeated transmissions of the RA preamble or the number of repeated transmissions of the RA preamble.

[0018] The one or more RSRP thresholds for the SBFD RA procedure can be set independently from the one or more RSRP thresholds for the legacy RA procedure.

[0019] The number of repetition transmissions for the above SBFD RA procedure can be set independently from the number of repetition transmissions for the above legacy RA procedure.

[0020] The above number of repetition transmissions can be applied equally to the above SBFD RA procedure and the above legacy RA procedure.

[0021] According to embodiments of the present disclosure for achieving the above object, a user equipment (UE) includes at least one processor, wherein the at least one processor causes the UE to receive random access channel (RACH) configuration information from a base station; determine an RO (RACH occasion) type in which repeated transmission of the RA preamble is performed based on the RACH configuration information indicating repeated transmission of the RA preamble; and perform repeated transmission of the RA preamble in an RO corresponding to the RO type.

[0022] The above RO type may be SBFD (subband full duplex) RO (RACH occasion) or legacy RO, and the UE supporting SBFD operation may determine the RO type as the SBFD RO.

[0023] Repeated transmission for the above RA preamble may be performed in one of the RO types, either the SBFD RO or the legacy RO, and repeated transmission for the above RA preamble may not be performed across the SBFD RO and the legacy RO.

[0024] The RACH configuration information may include SBFD RACH configuration information and legacy RACH configuration information, and each of the SBFD RACH configuration information and the legacy RACH configuration information may include one or more RSRP (reference signal received power) thresholds used to determine the number of times of repeated transmission of the RA preamble, and the one or more RSRP thresholds for the SBFD RA procedure based on the SBFD RACH configuration information may be set independently from the one or more RSRP thresholds for the legacy RA procedure based on the legacy RACH configuration information.

[0025] The above RACH configuration information may include SBFD RACH configuration information and legacy RACH configuration information, and each of the SBFD RACH configuration information and the legacy RACH configuration information may include the number of repetition transmissions of the RA preamble, and the number of repetition transmissions for the SBFD RA procedure based on the SBFD RACH configuration information may be set independently from the number of repetition transmissions for the legacy RA procedure based on the legacy RACH configuration information.

[0026] According to the present disclosure, SBFD RACH (random access channel) configuration information for a subband full duplex (SBFD) random access (RA) procedure and legacy RACH configuration information for a legacy RA procedure can be configured in a terminal. Parameter(s) for repeated transmission of an RA preamble in the SBFD RA procedure can be configured independently from the parameter(s) for repeated transmission of an RA preamble in the legacy RA procedure. A terminal supporting SBFD operation can perform repeated transmission of an RA preamble in an SBFD RO (RACH occasion) or a legacy RO. According to the above-described operation, the SBFD RA procedure can be performed independently from the legacy RA procedure, and a collision between the SBFD RA procedure and the legacy RA procedure may not occur. Therefore, the SBFD RA procedure can be performed efficiently, and the performance of a communication system 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] FIG. 9a is a conceptual diagram illustrating embodiments of a shift method of legacy RO in the frequency domain.

[0037] FIG. 9b is a conceptual diagram illustrating embodiments of a shift method of legacy RO in the time domain.

[0038] Fig. 10 is a conceptual diagram illustrating embodiments of a method for transmitting msg1 in RO within a UL subband.

[0039] Figures 11a and 11b are conceptual diagrams illustrating embodiments of a method for repeating transmission of msg1.

[0040] Fig. 12 is a conceptual diagram illustrating embodiments of a msg1 transmission method of an SBFD terminal and a legacy terminal.

[0041] Figures 13a and 13b are conceptual diagrams illustrating embodiments of a msg1 transmission method of an SBFD terminal.

[0042] Fig. 14 is a flowchart illustrating embodiments of a method for transmitting an RA preamble of an SBFD terminal.

[0043] Figure 15 is a flowchart illustrating embodiments of the RA procedure.

[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, “signal and / or channel” may mean a signal, a channel, or “signal and channel,” and “signal” may be used to mean “signal and / or channel.” In the present disclosure, time and time point may be used interchangeably. Time may be interpreted as either time or time point depending on the context, and time point may be interpreted as either time or time point depending on the context.

[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 specified in the 3rd generation partnership project (3GPP) standard (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). 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. A base station may assume that DL communication and UL communication are possible in an SBFD symbol. 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) within a symbol in which a synchronization signal block (SSB) 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] 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 an FL region (or FL resource). A terminal that supports (e.g., recognizes) the SBFD operation may be referred to as an SBFD terminal or SBFD UE. A terminal that does not support (e.g., is not aware of) SBFD operation may be referred to as an N(non)-SBFD terminal or N-SBFD UE. An N-SBFD terminal may be a legacy terminal (e.g., a legacy UE). In the present disclosure, a terminal may be interpreted as an SBFD terminal and / or an N-SBFD terminal depending on the context. Legacy configuration (e.g., legacy information, legacy configuration information) may be information for an N-SBFD terminal.

[0119] A mapping rule between an RO (RACH (random access channel) occasion) and an SSB (synchronization signal block) where msg1 (message 1) is transmitted, a mapping rule between an RO and an SSB where msgA (message A) is transmitted, a method for setting the transmission power of msg1, and / or a method for setting the transmission power of msgA will be described. In the present disclosure, embodiments for msg1 will be described, but the embodiments can be applied not only to msg1 but also to msgA. In other words, the mapping rule between an RO and an SSB where msg1 is transmitted can be interpreted as a mapping rule between an RO and an SSB where msgA is transmitted. The method for setting the transmission power of msg1 can be interpreted as a method for setting the transmission power of msgA. In the present disclosure, msg1 can be interpreted as msg1 or msgA depending on the context, and msgA can be interpreted as msg1 or msgA depending on the context.

[0120] The methods (e.g., embodiments) proposed in this disclosure can be performed or applied independently. Alternatively, a combination of a plurality of methods (e.g., embodiments) among the methods (e.g., embodiments) proposed in this disclosure can be performed or applied. The methods (e.g., embodiments) proposed in this disclosure can be applied regardless of the RRC state of the terminal. For example, a terminal in an RRC idle state, an RRC inactive state, or an RRC connected state can perform the methods (e.g., embodiments) proposed in this disclosure. Although SSB is mentioned as a selection criterion for msg1 (e.g., an RO to which msg1 is transmitted) in this disclosure, other signals and / or channels (e.g., a reference signal for measuring a channel state) in addition to the SSB can also be used as a selection criterion for msg1 (e.g., an RO to which msg1 is transmitted). The reference signal can include a CSI-RS, a DM-RS, etc.

[0121] The time and / or frequency resources available for transmission of msg1 within a UL subband (e.g., SBFD resource) may be referred to as SBFD RO. The time and / or frequency resources (e.g., valid RO) available for transmission of msg1 in a UL region other than a UL subband (e.g., a UL region consisting of N-SBFD symbol(s)) may be referred to as N-SBFD RO or legacy RO. In the present disclosure, RO may be referred to as SBFD RO and / or N-SBFD RO (e.g., legacy RO) depending on the context.

[0122] ● SSB-RO mapping rules

[0123] A base station can transmit RACH configuration information to a terminal through signaling. A terminal can receive RACH configuration information from a base station through signaling of the base station. The RACH configuration information can be included in system information (e.g., system information block 1 (SIB1)) transmitted by the base station. The RACH configuration information can include RACH-ConfigCommon, RACH-ConfigCommonTwoStepRA, RACH-ConfigDedicated, RACH-ConfigGeneric, RACH-ConfigGenericTwoStepRA, and / or RACH-ConfigTwoTA. RACH configuration information for an RA procedure in an UL region other than a UL subband (e.g., an UL region composed of N-SBFD symbol(s)) can be referred to as legacy RACH configuration information.

[0124] RACH configuration information for an RA procedure in a UL subband may be referred to as SBFD RACH configuration information. The SBFD RACH configuration information may include parameters for an RA procedure in a UL subband. All or part of the SBFD RACH configuration information may be included in the SBFD configuration information. The base station may transmit the SBFD configuration information to the terminal through signaling (e.g., system information, an RRC message, a MAC CE, and / or DCI). The terminal may receive the SBFD configuration information through signaling from the base station and may check all or part of the SBFD RACH configuration information included in the SBFD configuration information.

[0125] An RO configured based on parameters included in SIB1 (e.g., prach-ConfigurationIndex) may be an RO for legacy terminals (e.g., a legacy RO). The legacy RO may be shifted in the time domain and / or frequency domain so that the legacy RO falls within a UL subband.

[0126] FIG. 9a is a conceptual diagram illustrating embodiments of a shift method of a legacy RO in the frequency domain, and FIG. 9b is a conceptual diagram illustrating embodiments of a shift method of a legacy RO in the time domain.

[0127] Referring to FIGS. 9A and 9B, RO may mean a legacy RO. The legacy RO may be configured based on legacy RACH configuration information. The legacy RO may be located outside a UL subband. An SBFD terminal may not transmit an RA preamble in a legacy RO located outside a UL subband. The base station may transmit a time offset (e.g., time shift information) and / or a frequency offset (e.g., frequency shift information) to the terminal through signaling in order to move the legacy RO configured by the legacy RACH configuration information into a UL subband. The time offset and / or the frequency offset may be included in the legacy RACH configuration information and / or the SBFD RACH configuration information. The terminal may receive the time offset and / or the frequency offset through signaling from the base station.

[0128] In the embodiment of FIG. 9a, a frequency offset may be applied to a legacy RO, and the legacy RO to which the frequency offset is applied may belong to a UL subband. By applying the frequency offset, the legacy RO belonging to the UL subband may be interpreted (e.g., regarded) as a SBFD RO. The frequency offset may be applied to the lowest subcarrier or the highest subcarrier of consecutive legacy ROs.

[0129] In the embodiment of FIG. 9b, a time offset may be applied to a legacy RO, and the legacy RO to which the time offset is applied may belong to a UL subband. By applying the time offset, the legacy RO belonging to the UL subband may be interpreted (e.g., regarded) as an SBFD RO. The time offset may be applied to the start symbol or the last symbol of consecutive legacy ROs.

[0130] The time offset and / or frequency offset may be included in the SBFD configuration information (e.g., system information including the SBFD configuration information, SBFD RACH configuration information). The base station may transmit the configuration for the time offset and / or the frequency offset to the terminal through signaling (e.g., system information, an RRC message, MAC CE, and / or DCI). The terminal may receive the configuration for the time offset and / or the frequency offset through signaling from the base station. The priority of applying the configuration may be in the order of "DCI → MAC-CE → ​​RRC message". The movement of an RO in the frequency domain may mean a movement by a preset value (e.g., a frequency offset) based on a start position (e.g., a start position indicated by msg1-FrequencyStart) for msg1 (e.g., an RO to which msg1 is transmitted) in the frequency domain.

[0131] Method #1: SBFD terminals can apply legacy SSB-RO mapping rules.

[0132] The SSB-RO mapping rule for the RA procedure in a UL region other than the UL subband (e.g., the UL region consisting of N-SBFD symbol(s)) may be referred to as a legacy SSB-RO mapping rule. The legacy SSB-RO mapping rule may be applied for the RA procedure in the UL subband. The UE may determine an RO for transmission of msg1 within the UL subband based on the legacy SSB-RO mapping rule. For example, the UE may identify ROs associated with SSB based on the legacy SSB-RO mapping rule, and may expect to transmit msg1 in RO(s) belonging to the UL subband among the identified ROs.

[0133] A base station can transmit (e.g., set, instruct) a quality threshold for SSB selection (e.g., RSRP (reference signal received power) threshold) to a terminal via signaling. The terminal can receive the quality threshold for SSB selection via signaling from the base station. The terminal can select an SSB having a quality equal to or higher than the quality threshold (e.g., RSRP threshold), and identify ROs associated with the selected SSB based on a legacy SSB-RO mapping rule, and transmit msg1 in RO(s) belonging to a UL subband among the identified ROs.

[0134] If the reception quality (e.g., RSRP) of an SSB associated with an RO belonging to a UL subband is below a quality threshold, the UE may not expect to transmit msg1 in the RO. The UE may determine the RO(s) associated with an SSB having a quality below the quality threshold among the ROs belonging to the UL subband as invalid RO(s). The UE may determine the RO(s) associated with an SSB having a quality equal to or higher than the quality threshold among the ROs belonging to the UL subband as valid RO(s). The UE may transmit msg1 in valid RO(s) within the UL subband.

[0135] Among the ROs configured based on legacy RACH configuration information, the RO(s) belonging to the UL subband may be valid RO(s). The UE may expect to transmit msg1 in one or more valid ROs associated with SSB having a quality equal to or higher than a quality threshold among the valid RO(s) within the UL subband. If there is no valid RO(s) associated with SSB having a quality equal to or higher than the quality threshold among the valid RO(s) within the UL subband, the UE may expect to transmit msg1 in the next UL subband (e.g., the next UL subband according to the SBFD cycle) or in an RO in which the UE can transmit thereafter.

[0136] If a quality threshold for SSB selection is not set in the terminal, the terminal may transmit msg1 in a valid RO associated with SSB having the best reception quality among valid ROs (e.g., ROs belonging to a UL subband).

[0137] Fig. 10 is a conceptual diagram illustrating embodiments of a method for transmitting msg1 in RO within a UL subband.

[0138] Referring to FIG. 10, a base station can generate RACH configuration information for an SBFD terminal and transmit the RACH configuration information to the SBFD terminal through signaling. The SBFD terminal can receive the RACH configuration information through signaling from the base station. The RACH configuration information for the SBFD terminal may mean SBFD RACH configuration information. The SBFD terminal can identify ROs associated with SSBs based on legacy SSB-RO mapping rules, and determine (e.g., determine) one or more ROs belonging to a UL subband among the identified ROs as valid RO(s).

[0139] For example, based on the legacy SSB-RO mapping rule, SSB #1 can be associated with RO #1, SSB #2 can be associated with RO #2, SSB #3 can be associated with RO #3, and SSB #4 can be associated with RO #4. ​​The SBFD terminal can check RO #1 to RO #4 associated with SSB #1 to SSB #4 based on the legacy SSB-RO mapping rule, and determine RO #2 to RO #4 belonging to the UL subband among RO #1 to RO #4 as valid ROs. The terminal can transmit msg1 in RO #4 associated with SSB #4, which has the best reception quality among RO #2 to RO #4 belonging to the UL subband.

[0140] If a quality threshold is set in the terminal and the reception quality of SSB #2 to SSB #4 does not satisfy the quality threshold, the terminal may not expect to transmit msg1 in RO #2 to RO #4 belonging to the UL subband. The fact that the reception quality of SSB #2 to SSB #4 does not satisfy the quality threshold may mean that the reception quality of SSB #2 to SSB #4 is below the quality threshold.

[0141] Based on the above-described method #1, the SBFD terminal can transmit msg1 in an RO within an UL subband using existing RACH configuration information (e.g., legacy RACH configuration information, legacy SSB-RO mapping rules). Although msg1 may not be transmitted in an RO associated with an SSB with the best reception quality, the SBFD terminal can transmit msg1 using increased transmission power based on power ramping in the next transmission procedure of msg1 (e.g., retransmission procedure). In this case, the previous reception failure of msg1 at the base station can be compensated for.

[0142] ◆ Method #2: SBFD terminal can first determine the valid ROs, apply SSB-RO mapping rules to the valid ROs, and expect to transmit msg1 from the valid ROs based on the SSB-RO mapping rules.

[0143] A terminal (e.g., an SBFD terminal) can first determine (e.g., judge, confirm) valid RO(s) by considering a UL subband, and apply an SSB-RO mapping rule to the valid RO(s). To ensure that all ROs associated with SSBs are valid, the base station can additionally create a configuration for an SSB-RO mapping rule within the UL subband. The SSB-RO mapping rule within the UL subband may be referred to as an SBFD SSB-RO mapping rule. The base station can transmit configuration information for the SBFD SSB-RO mapping rule to the terminal through signaling. The terminal can receive configuration information for the SBFD SSB-RO mapping rule through signaling from the base station. The configuration information for the SBFD SSB-RO mapping rule may be included in the SBFD configuration information and / or the SBFD RACH configuration information. Since it is necessary for all SSBs to be mapped to ROs belonging to the UL subband, the SBFD SSB-RO mapping rule can be configured. SBFD SSB-RO mapping rules can be set independently from legacy SSB-RO mapping rules.

[0144] The SBFD terminal can use legacy RACH configuration information. If parameter(s) for the RA procedure (e.g., SBFD RA parameter(s)) are configured in a UL subband (e.g., SBFD resource), the SBFD terminal can replace parameter(s) corresponding to the SBFD RA parameter(s) among the legacy RACH configuration information with the SBFD RA parameter(s), and can expect to transmit msg1 based on the SBFD RA parameter(s). The SBFD RA parameter(s) can include configuration information for the SBFD SSB-RO mapping rule.

[0145] The SBFD RA parameter(s) may be all or part of the parameters included in the legacy RACH configuration information. For example, the SBFD RA parameter(s) may be parameter(s) related to the transmission resources of msg1 among the parameters included in the legacy RACH configuration information (e.g., msg1-FDM, msg1-FrequencyStart, prach-ConfigurationIndex, etc.). Since the reception of msg2 may be linked to the duration and / or periodicity of the UL subband, a window (e.g., a random access response (RAR) window) for the reception of msg2 may be separately configured for the SBFD terminal. The RAR window configured for the SBFD terminal may be referred to as an SBFD RAR window. The base station may transmit the configuration information of the SBFD RAR window to the terminal through signaling. The terminal may receive the configuration information of the SBFD RAR window through signaling from the base station.

[0146] Method #3

[0147] In a repeat transmission procedure of msg1 (e.g., RA preamble, PRACH (physical random access channel) preamble), a UE (e.g., an SBFD UE) may expect to perform repeat transmission of msg1 in RO(s) belonging to an UL subband. The UE may not expect to transmit msg1 in RO(s) configured in N-SBFD resources (e.g., legacy RO). In other words, the UE may not transmit msg1 in RO(s) that do not belong to an UL subband. The UE may perform repeat transmission for msg1 in RO(s) where a complete preamble format can be transmitted.

[0148] Figures 11a and 11b are conceptual diagrams illustrating embodiments of a method for repeating transmission of msg1.

[0149] Referring to FIGS. 11A and 11B, six repetitions of msg1 having a preamble format A1 within one slot can be configured. msg1 having a preamble format A1 can be configured in two symbols. msg1 having a preamble format A1 can be composed of a CP (cyclic prefix) and a sequence. When preamble format A1 is indicated, the sequence can be repeated twice within msg1. Some areas within one slot can be N-SBFD resources (e.g., DL symbol(s)), and the remaining areas within one slot can be UL subbands.

[0150] In the embodiment of FIG. 11a, N-SBFD resources (e.g., DL symbol(s)) may be located in the front region of the slot. Among the six ROs for repeated transmission of msg1, two ROs may belong to N-SBFD resources, and the remaining four ROs may belong to UL subbands. Even if six repeated transmissions of msg1 are instructed to the UE based on the PRACH configuration index (e.g., prach-ConfigurationIndex), the UE may transmit msg1 four times in four ROs belonging to the UL subband.

[0151] In the embodiment of FIG. 11b, N-SBFD resources (e.g., DL symbol(s)) may be located in the rear region of the slot. Among the six ROs for repeated transmission of msg1, four ROs may belong to the UL subband, one RO may be configured across the UL subband and N-SBFD resources, and one RO may belong to the N-SBFD resource. Even if six repeated transmissions of msg1 are instructed to the UE based on the PRACH configuration index (e.g., prach-ConfigurationIndex), the UE may transmit msg1 four times in four ROs belonging to the UL subband. The UE may not transmit msg1 in the ROs configured across the UL subband and N-SBFD resources.

[0152] The above-described method can also be applied to other preamble formats (e.g., preamble formats 0, 1, 2, 3, A1, A2, A3, B1, B2, B3, B4, C0, C2). Even if the terminal is instructed to transmit msg1 repeatedly n times, the terminal can transmit msg1 repeatedly m times in the UL subband. Each of n and m can be a natural number, and m can be less than or equal to n. The terminal can transmit msg1 repeatedly as many times as the number of times that can be transmitted in the UL subband. If the preamble format B4 is instructed to the terminal, the sequence in msg1 can be repeated 12 times. If the resource that can transmit the sequence of msg1 7 times belongs to a UL subband and the resource that can transmit the sequence of msg1 5 times belongs to an N-SBFD resource, the terminal can transmit the sequence of msg1 7 times within the UL subband, and the 5 repetitions of the sequence of msg1 can be replaced with a guard period.

[0153] Method #4

[0154] SBFD terminals can be expected to perform RACH transmissions (e.g., msg1 transmissions) within SBFD symbols (e.g., SBFD resources, UL subbands) by default. If certain conditions are met, SBFD terminals can be expected to perform RACH transmissions in N-SBFD symbols as well as SBFD symbols. These conditions may be based on separate configurations for power control. The reason for this behavior is that there is a discrepancy in fairness between legacy terminals transmitting RA preambles in legacy ROs and SBFD terminals.

[0155] Fig. 12 is a conceptual diagram illustrating embodiments of a msg1 transmission method of an SBFD terminal and a legacy terminal.

[0156] Referring to FIG. 12, an RO for an SBFD terminal may exist in an N-SBFD resource as well as an UL subband. An SBFD terminal may transmit msg1 in an RO #4 associated with SSB #4 within an UL subband, and an RO #4 associated with SSB #4 may exist within an N-SBFD resource subsequent to the UL subband. If there is no restriction on power control of msg1 and retransmission of msg1 of the SBFD terminal in an RO #4 associated with SSB #4 within an N-SBFD is required, the SBFD terminal may transmit msg1 in an RO #4 associated with SSB #4 within an N-SBFD using increased power. Meanwhile, a legacy terminal may initially transmit msg1 in an RO #4 associated with SSB #4 within an N-SBFD. The transmission power for the initial transmission of msg1 by a legacy terminal may be lower than the transmission power for the retransmission of msg1 by an SBFD terminal. In this case, the probability of successful reception of the initial transmission of msg1 by the legacy terminal at the base station may be relatively low, while the probability of successful reception of the retransmission of msg1 by the SBFD terminal at the base station may be relatively high.

[0157] If certain conditions are not satisfied, the SBFD terminal can perform RACH transmission only in the RO existing within the UL subband. If power control for RACH transmission of the SBFD terminal within the UL subband and / or power control for RACH transmission of the SBFD terminal in N-SBFD resources are performed, the SBFD terminal can be expected to perform RACH transmission in the RO configured in the UL subband (e.g., SBFD resources) and the RO configured in the N-SBFD resources.

[0158] ● Power control

[0159] Power control information (e.g., power control configuration information, power control parameter(s)) may include parameter(s) for configuring (e.g., controlling) not only the initial transmission power but also the retransmission transmission power. A method for controlling (e.g., configuring) the transmission power of a terminal in a RACH procedure (e.g., an RA procedure) will be proposed.

[0160] Method #5

[0161] An SBFD terminal can independently (e.g., individually, in parallel) set (e.g., control, manage) the transmit power for msg1 transmission in an RO (e.g., an SBFD RO) within a UL subband and the transmit power for msg1 transmission in an RO (e.g., a legacy RO) within an N-SBFD resource (e.g., an UL region). The msg1 transmission may include an initial transmission and / or a retransmission of msg1. As in the embodiment of FIG. 12, when an SBFD terminal transmits msg1 in a legacy RO as well as an SBFD RO, the SBFD terminal can independently control the transmit power for msg1 transmission in the SBFD RO and the transmit power for msg1 transmission in the legacy RO. The parameter(s) and procedure related to the transmit power of msg1 can be independently controlled for each of msg1 transmission in the SBFD RO and msg1 transmission in the legacy RO. Parameter(s) and procedures related to the transmission power of msg1 may include the maximum number of transmissions of msg1, a ramping counter, a ramping step, a transmission counter, etc.

[0162] A base station can generate legacy power control information for an RA procedure (e.g., a legacy RA procedure) in N-SBFD resources and SBFD power control information for an RA procedure (e.g., an SBFD RA procedure) in SBFD resources. The legacy power control information and the SBFD power control information can include the same parameters (e.g., a maximum number of transmissions of msg1, a ramping counter, a ramping step, a transmission counter, etc.), and the values ​​of each of the same parameters can be independently set in the legacy power control information and the SBFD power control information. Alternatively, some parameters of the legacy power control information can be different from parameters included in the SBFD power control information, and some parameters of the SBFD power control information can be different from parameters included in the legacy power control information.

[0163] The base station can transmit legacy power control information and SBFD power control information to terminals (e.g., legacy terminals and / or SBFD terminals) via signaling. For example, the base station can transmit legacy power control information to the legacy terminal, and the base station can transmit legacy power control information and SBFD power control information to the SBFD terminal. The legacy terminal can receive the legacy power control information via signaling from the base station. The legacy terminal can perform msg1 transmission (e.g., initial transmission and / or retransmission of msg1) in the legacy RO based on the transmission power determined based on the legacy power control information. The SBFD terminal can receive legacy power control information and SBFD power control information via signaling from the base station. The SBFD terminal can perform msg1 transmission (e.g., initial transmission and / or retransmission of msg1) in the SBFD RO based on the transmission power determined based on the SBFD power control information. The SBFD terminal can perform msg1 transmission (e.g., initial transmission and / or retransmission of msg1) in the legacy RO based on the transmission power determined based on the legacy power control information.

[0164] Figures 13a and 13b are conceptual diagrams illustrating embodiments of a msg1 transmission method of an SBFD terminal.

[0165] Referring to FIGS. 13A and 13B, the SBFD terminal can transmit msg1 in the SBFD RO and the legacy RO. The transmission power of msg1 in the SBFD RO can be controlled based on SBFD power control information. The transmission power of msg1 in the legacy RO can be controlled based on legacy power control information. Retransmission of msg1 can be performed if msg2, which is a response to msg1, is not received.

[0166] In the embodiment of FIG. 13a, the transmit power for retransmission of msg1 in a legacy RO can be determined without applying power ramping, and the transmit power for retransmission of msg1 in a SBFD RO can be determined by applying power ramping. For example, an SBFD terminal can perform an initial transmission of msg1 in an SBFD RO, and perform a retransmission of msg1 in a legacy RO subsequent to the SBFD RO. The transmit power for retransmission of msg1 in a legacy RO can be determined without applying power ramping. For example, the transmit power for retransmission of msg1 in a legacy RO can be the same as the transmit power for an initial transmission of msg1 in the SBFD RO. The SBFD terminal can perform a retransmission of msg1 in a SBFD RO subsequent to the legacy RO. The transmit power for retransmission of msg1 in the SBFD RO following the legacy RO can be determined by applying power ramping. In other words, the SBFD terminal can perform retransmission of msg1 using the increased transmit power in the SBFD RO following the legacy RO. The transmit power for retransmission of msg1 can be compensated separately.

[0167] In the embodiment of FIG. 13b, the transmit power for retransmission of msg1 in a legacy RO can be determined by applying power ramping, and the transmit power for retransmission of msg1 in a SBFD RO can be determined by applying power ramping. In other words, regardless of the RO type (e.g., legacy RO, SBFD RO), the SBFD terminal can apply power ramping to determine the transmit power for retransmission of msg1. For example, the SBFD terminal can perform an initial transmission of msg1 in an SBFD RO, and perform a retransmission of msg1 in a legacy RO subsequent to the SBFD RO. The transmit power for retransmission of msg1 in a legacy RO can be determined by applying power ramping. In other words, the SBFD terminal can perform retransmission of msg1 using the increased transmit power in the legacy RO subsequent to the SBFD RO. The SBFD terminal can perform retransmission of msg1 in the SBFD RO following the legacy RO. The transmission power for retransmission of msg1 in the SBFD RO following the legacy RO can be determined by applying power ramping. In other words, the SBFD terminal can perform retransmission of msg1 using the increased transmission power in the SBFD RO following the legacy RO.

[0168] When an SBFD terminal independently controls the transmit power for msg1 transmission in an SBFD RO and the transmit power for msg1 transmission in a legacy RO, the base station may transmit information necessary for controlling the transmit power (e.g., SBFD power control information and / or legacy power control information) to the SBFD terminal via signaling. For example, when the SBFD terminal supports the embodiment of FIG. 13a, the base station may transmit SBFD power control information and legacy power control information to the SBFD terminal. When the SBFD terminal controls the transmit power for msg1 transmission regardless of the RO type, the base station may transmit common power control information (e.g., legacy power control information) applicable to both the SBFD RO and the legacy RO to the SBFD terminal via signaling. For example, when the SBFD terminal supports the embodiment of FIG. 13b, the base station may transmit legacy power control information to the SBFD terminal via signaling. In this case, power ramping and / or calculation of ramping counters can be performed based on existing rules (e.g., legacy rules).

[0169] The base station can transmit an instruction for independent power control or common power control to the SBFD terminal via signaling (e.g., system information and / or RRC message). The SBFD terminal can receive an instruction for independent power control or common power control via signaling from the base station. If independent power control is indicated, the SBFD terminal can independently control the transmit power for transmitting msg1 in the SBFD RO and the transmit power for transmitting msg1 in the legacy RO. If common power control is indicated, the SBFD terminal can commonly control the transmit power for transmitting msg1 regardless of the RO type (e.g., SBFD RO, legacy RO).

[0170] Method #6

[0171] The base station can transmit to the SBFD terminal via signaling a set of information (e.g., legacy power control information) necessary for setting the transmission power of the legacy terminal in relation to (re)transmission of msg1 and a set of some parameters included in the legacy power control information. The SBFD terminal can receive the legacy power control information and a set of some parameters included in the legacy power control information via signaling from the base station. For example, the maximum number of transmissions and / or the maximum transmission power of msg1 can be set to a common value (e.g., a single value), and information about the maximum number of transmissions and / or the maximum transmission power of msg1 can be transmitted to the SBFD terminal via signaling from the base station. The transmission counter can be increased by 1 each time msg1 is transmitted, regardless of the RO type (e.g., SBFD RO, legacy RO). The initial received target power can be set to a common value (e.g., a single value), and information about the initial received target power can be transmitted to the terminal through signaling from the base station.

[0172] The SBFD terminal can independently manage the ramping counters for each transmission of msg1 in the SBFD RO and each transmission of msg1 in the legacy RO. For example, if a retransmission of msg1 is performed in the legacy RO after msg1 is transmitted in the SBFD RO, the ramping counter (e.g., the ramping counter for the SBFD RO) can be maintained as is. The ramping counter can be initialized. If a retransmission of msg1 is performed again in the SBFD RO after msg1 was retransmitted in the legacy RO, the ramping counter (e.g., the ramping counter for the SBFD RO) can be increased by 1. In this case, the ramping counter for the legacy RO can be maintained as is. If retransmission of msg1 is performed again in a legacy RO after msg1 has been retransmitted in an SBFD RO, the ramping counter for the SBFD RO may remain the same, and the ramping counter for the legacy RO may be increased by 1. The transmission counter of msg1 may be increased regardless of the RO type. The SBFD terminal may expect to (re)transmit msg1 up to the maximum number of transmissions set by the base station.

[0173] Fig. 14 is a flowchart illustrating embodiments of a method for transmitting an RA preamble of an SBFD terminal.

[0174] Referring to FIG. 14, a base station may generate power control information for a RACH procedure (S1401). The power control information may include legacy power control information and SBFD power control information. Each of the legacy power control information and the SBFD power control information may include at least one of a maximum output power, a parameter(s) for determining a PRACH target reception power, or a parameter(s) for determining a path loss. The parameter(s) for determining the PRACH target reception power may include at least one of a power ramping step (e.g., powerRampingStep, msgA-PreamblePowerRampingStep) or a preamble reception target power (e.g., PreambleReceivedTargetPower, msgA-PreambleReceivedTargetPower). The legacy power control information and the SBFD power control information may be set independently. The values ​​of the same parameters included in the legacy power control information and the SBFD power control information may be set differently. For example, the value of the power ramping step included in the legacy power control information can be set independently from the value of the power ramping step included in the legacy SBFD power control information, and the value of the preamble reception target power included in the legacy power control information can be set independently from the value of the preamble reception target power included in the legacy SBFD power control information.

[0175] The base station can transmit power control information to the terminal through signaling (e.g., system information, RRC message, MAC CE, and / or DCI) (S1402). The terminal can receive the power control information through signaling of the base station (S1402). In the embodiment of FIG. 14, the terminal may be an SBFD terminal. The power control information may be included in RACH configuration information. In S1402, the RACH configuration information including the power control information may be transmitted from the base station to the terminal. If the RACH configuration information includes legacy RACH configuration information and SBFD RACH configuration information, in S1402, the legacy RACH configuration information including the legacy power control information and the SBFD RACH configuration information including the SBFD power control information may be transmitted from the base station to the terminal.

[0176] The terminal can identify the RO based on the RACH configuration information. The terminal can determine the transmission power for the first transmission (e.g., initial transmission or retransmission) of the RA preamble in the RO (S1403). In the embodiment of FIG. 14, the RA preamble can be interpreted as msg1 and / or msgA (e.g., msgA preamble). The terminal can determine the transmission power for the first transmission of the RA preamble based on the following mathematical expression 1.

[0177]

[0178] may be the transmit power of the RA preamble. For example, may be the transmit power of the RA preamble in the active UL BWP (b) of the carrier (f) of the cell (c) within the transmission occasion (i). may be the maximum output power for a carrier (f) of a cell (c) within a transmission occasion (i). The maximum output power may be predefined in the technical specification. Alternatively, the maximum output power may be indicated to the terminal by signaling from the base station. The maximum output power for the legacy RACH procedure and the maximum output power for the SBFD RACH procedure may be independently set.

[0179] may be the PRACH target reception power for the active UL BWP (b) of the carrier (f) of the cell (c). The PRACH target reception power may be determined based on the following mathematical expression 2.

[0180]

[0181] may be a preamble reception target power indicated by a base station. The preamble reception target power for the legacy RACH procedure and the preamble reception target power for the SBFD RACH procedure can be set independently. can be predefined in technical specifications. may be a preamble power ramping counter. The initial value of the preamble power ramping counter may be 1. The preamble power ramping counter may be incremented by 1 for each retransmission of the RA preamble. The preamble power ramping counter for the legacy RACH procedure and the preamble power ramping counter for the SBFD RACH procedure may be independently controlled (e.g., managed). The power ramping step may be directed by the base station. The power ramping step for the legacy RACH procedure and the power ramping step for the SBFD RACH procedure may be independently set.

[0182] may be the path loss for the active UL BWP (b) of the carrier (f) of the cell (c). The path loss may be determined based on the following mathematical expression 3.

[0183]

[0184] may be a reference signal power indicated to the terminal by signaling from the base station. It may be RSRP measured at the upper layer of the terminal.

[0185] If the RO where the first transmission of the RA preamble is performed is a legacy RO, the terminal can determine the transmission power of the RA preamble based on legacy power control information. If the RO where the first transmission of the RA preamble is performed is an SBFD RO, the terminal can determine the transmission power of the RA preamble based on the SBFD power control information. The terminal can transmit the RA preamble to the base station using the determined transmission power (S1404). If a response (e.g., msg2 or msgB) to the RA preamble is not received from the base station, the terminal can determine that the transmission of the RA preamble has failed. The terminal can perform retransmission of the RA preamble. The terminal can determine the transmission power for retransmission of the RA preamble (S1405). The terminal can perform retransmission of the RA preamble using the determined transmission power (S1406). S1403 and S1404 may be operations for the first transmission of the RA preamble, and S1405 and S1406 may be operations for the second transmission of the RA preamble. The first transmission may be an initial transmission or a retransmission, and the second transmission may be a retransmission of the first transmission. In the description of Case #1 and Case #2 below (e.g., Case #2-1 and Case #2-2), the initial transmission may refer to the first transmission, and the retransmission may refer to the second transmission.

[0186] ◆ Case #1: The initial transmission of the RA preamble and the retransmission of the RA preamble are performed in the same type of RO.

[0187] The initial transmission and retransmission of the RA preamble can be performed in the legacy RO. In this case, the terminal can determine the transmission power for the retransmission of the RA preamble based on the legacy power control information. The terminal can determine the transmission power for the retransmission of the RA preamble by applying a power ramping counter increased by 1. Among the parameters for determining the transmission power for the retransmission of the RA preamble, the values ​​of the parameters excluding the power ramping counter can be the same as the values ​​of the parameters for determining the transmission power for the initial transmission of the RA preamble.

[0188] The initial transmission and retransmission of the RA preamble can be performed in the SBFD RO. In this case, the terminal can determine the transmission power for the retransmission of the RA preamble based on the SBFD power control information. The terminal can determine the transmission power for the retransmission of the RA preamble by applying a power ramping counter increased by 1. Among the parameters for determining the transmission power for the retransmission of the RA preamble, the values ​​of the parameters excluding the power ramping counter can be the same as the values ​​of the parameters for determining the transmission power for the initial transmission of the RA preamble.

[0189] ◆ Case #2: The initial transmission of the RA preamble and the retransmission of the RA preamble are performed in different types of ROs.

[0190] ▶ Case #2-1: The initial transmission of the RA preamble can be performed in the legacy RO, and the retransmission of the RA preamble can be performed in the SBFD RO. The transmit power for the retransmission of the RA preamble can be determined based on the method below.

[0191] In the first method, the terminal can use the legacy power control information to determine the transmit power for the retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the legacy RO and the transmit power for the retransmission of the RA preamble in the SBFD RO can be determined using the same legacy power control information. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, the power control information used to determine the transmit power of the RA preamble in the previous RO can be used to determine the transmit power of the RA preamble in the current RO. In this case, the power ramping counter increased by 1 can be used to determine the transmit power for the retransmission of the RA preamble in the SBFD RO. For example, the power ramping counter used to determine the transmit power for the initial transmission of the RA preamble in a legacy RO may be 1, and the power ramping counter used to determine the transmit power for the retransmission of the RA preamble in a SBFD RO may be 2. Generalizing the above operation, if the RO type for repeated transmission of the RA preamble is changed, the power ramping counter may be incremented for each transmission of the RA preamble.

[0192] As a second method, the terminal can use legacy power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the legacy RO and the transmit power for retransmission of the RA preamble in the SBFD RO can be determined using the same legacy power control information. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, the power control information used to determine the transmit power of the RA preamble in the previous RO can be used to determine the transmit power of the RA preamble in the current RO. In this case, the initial power ramping counter (e.g., the previous power ramping counter) can be used to determine the transmit power for retransmission of the RA preamble in the SBFD RO. The initial power ramping counter (e.g., the initial value of the power ramping counter) can be 1. For example, the power ramping counter used to determine the transmit power for the initial transmission of the RA preamble in a legacy RO may be 1, and the power ramping counter used to determine the transmit power for the retransmission of the RA preamble in a SBFD RO may be 1. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, the power ramping counter may be initialized. Alternatively, when the RO type for repeated transmission of the RA preamble is changed, the power ramping counter may be maintained at a previous value.

[0193] In a third method, the terminal can use the SBFD power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the legacy RO can be determined using the legacy power control information, and the transmit power for the retransmission of the RA preamble in the SBFD RO can be determined using the SBFD power control information. The preamble reception target power and / or power ramping step used to determine the transmit power for the retransmission of the RA preamble in the SBFD RO may be different from the preamble reception target power and / or power ramping step used to determine the transmit power for the initial transmission of the RA preamble in the legacy RO. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, power control information according to the RO type (e.g., legacy power control information or SBFD power control information) can be used to determine the transmit power of the RA preamble. A power ramping counter incremented by 1 may be used to determine the transmit power for a retransmission of an RA preamble in an SBFD RO. For example, the power ramping counter used to determine the transmit power for an initial transmission of an RA preamble in a legacy RO may be 1, and the power ramping counter used to determine the transmit power for a retransmission of an RA preamble in an SBFD RO may be 2. Generalizing the above operation, if the RO type for repeated transmission of an RA preamble is changed, the power ramping counter may be incremented for each transmission of the RA preamble.

[0194] In a fourth method, the terminal can use the SBFD power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the legacy RO can be determined using the legacy power control information, and the transmit power for the retransmission of the RA preamble in the SBFD RO can be determined using the SBFD power control information. The preamble reception target power and / or power ramping step used to determine the transmit power for the retransmission of the RA preamble in the SBFD RO may be different from the preamble reception target power and / or power ramping step used to determine the transmit power for the initial transmission of the RA preamble in the legacy RO. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, power control information according to the RO type (e.g., legacy power control information or SBFD power control information) can be used to determine the transmit power of the RA preamble. An initial power ramping counter (e.g., a previous power ramping counter) may be used to determine the transmit power for retransmission of an RA preamble in an SBFD RO. The initial power ramping counter (e.g., an initial value of the power ramping counter) may be 1. For example, the power ramping counter used to determine the transmit power for an initial transmission of an RA preamble in a legacy RO may be 1, and the power ramping counter used to determine the transmit power for retransmission of an RA preamble in an SBFD RO may be 1. Generalizing the above operation, when the RO type for repeated transmission of an RA preamble is changed, the power ramping counter may be initialized. Alternatively, when the RO type for repeated transmission of an RA preamble is changed, the power ramping counter may be maintained at a previous value.

[0195] ▶ Case #2-2: The initial transmission of the RA preamble can be performed in the SBFD RO, and the retransmission of the RA preamble can be performed in the legacy RO. The transmit power for the retransmission of the RA preamble can be determined based on the method below.

[0196] In the first method, the terminal can use the SBFD power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the SBFD RO and the transmit power for retransmission of the RA preamble in the legacy RO can be determined using the same SBFD power control information. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, the power control information used to determine the transmit power of the RA preamble in the previous RO can be used to determine the transmit power of the RA preamble in the current RO. In this case, a power ramping counter increased by 1 can be used to determine the transmit power for retransmission of the RA preamble in the legacy RO. For example, the power ramping counter used to determine the transmit power for the initial transmission of the RA preamble in an SBFD RO may be 1, and the power ramping counter used to determine the transmit power for the retransmission of the RA preamble in a legacy RO may be 2. Generalizing the above operation, if the RO type for repeated transmission of the RA preamble is changed, the power ramping counter may be incremented for each transmission of the RA preamble.

[0197] In a second method, the terminal can use the SBFD power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the SBFD RO and the transmit power for retransmission of the RA preamble in the legacy RO can be determined using the same SBFD power control information. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, the power control information used to determine the transmit power of the RA preamble in the previous RO can be used to determine the transmit power of the RA preamble in the current RO. In this case, the initial power ramping counter (e.g., the previous power ramping counter) can be used to determine the transmit power for retransmission of the RA preamble in the legacy RO. The initial power ramping counter (e.g., the initial value of the power ramping counter) can be 1. For example, the power ramping counter used to determine the transmit power for the initial transmission of the RA preamble in an SBFD RO may be 1, and the power ramping counter used to determine the transmit power for the retransmission of the RA preamble in a legacy RO may be 1. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, the power ramping counter may be initialized. Alternatively, when the RO type for repeated transmission of the RA preamble is changed, the power ramping counter may be maintained at a previous value.

[0198] In a third method, the terminal can use the legacy power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the SBFD RO can be determined using the SBFD power control information, and the transmit power for the retransmission of the RA preamble in the legacy RO can be determined using the legacy power control information. The preamble reception target power and / or power ramping step used to determine the transmit power for the retransmission of the RA preamble in the legacy RO may be different from the preamble reception target power and / or power ramping step used to determine the transmit power for the initial transmission of the RA preamble in the SBFD RO. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, power control information according to the RO type (e.g., legacy power control information or SBFD power control information) can be used to determine the transmit power of the RA preamble. A power ramping counter incremented by 1 may be used to determine the transmit power for a retransmission of an RA preamble in a legacy RO. For example, the power ramping counter used to determine the transmit power for an initial transmission of an RA preamble in a SBFD RO may be 1, and the power ramping counter used to determine the transmit power for a retransmission of an RA preamble in a legacy RO may be 2. Generalizing the above operation, if the RO type for repeated transmission of an RA preamble is changed, the power ramping counter may be incremented for each transmission of the RA preamble.

[0199] As a fourth method, the terminal can use the legacy power control information to determine the transmit power for retransmission of the RA preamble. In other words, the transmit power for the initial transmission of the RA preamble in the SBFD RO can be determined using the SBFD power control information, and the transmit power for the retransmission of the RA preamble in the legacy RO can be determined using the legacy power control information. The preamble reception target power and / or power ramping step used to determine the transmit power for the retransmission of the RA preamble in the legacy RO may be different from the preamble reception target power and / or power ramping step used to determine the transmit power for the initial transmission of the RA preamble in the SBFD RO. Generalizing the above operation, when the RO type for repeated transmission of the RA preamble is changed, power control information according to the RO type (e.g., legacy power control information or SBFD power control information) can be used to determine the transmit power of the RA preamble. In a legacy RO, an initial power ramping counter (e.g., a previous power ramping counter) may be used to determine the transmit power for retransmission of an RA preamble. The initial power ramping counter (e.g., an initial value of the power ramping counter) may be 1. For example, the power ramping counter used to determine the transmit power for an initial transmission of an RA preamble in an SBFD RO may be 1, and the power ramping counter used to determine the transmit power for retransmission of an RA preamble in a legacy RO may be 1. Generalizing the above operation, when the RO type for repeated transmission of an RA preamble is changed, the power ramping counter may be initialized. Alternatively, when the RO type for repeated transmission of an RA preamble is changed, the power ramping counter may be maintained at a previous value.

[0200] ● RACH settings

[0201] A RACH configuration for a legacy terminal may be referred to as a legacy RACH configuration (e.g., legacy RACH configuration information). A RACH configuration additionally configured for an SBFD terminal may be referred to as an SBFD RACH configuration (e.g., SBFD RACH configuration information). Among the parameters included in the RACH configuration information, a parameter named "Legacy" may refer to a parameter for a legacy terminal. Among the parameters included in the RACH configuration information, a parameter named "SBFD" may refer to a parameter for an SBFD terminal. For example, a legacy RO may be an RO for a legacy terminal, and an SBFD RO may be an RO for an SBFD terminal. An SBFD RO may be referred to as an additional RO.

[0202] Method #7

[0203] The SBFD terminal can use the legacy RACH configuration information configured for the legacy terminal as is. Alternatively, the SBFD terminal can use the SBFD RACH configuration information configured separately for the SBFD terminal. If the SBFD RACH configuration information is configured independently of the legacy RACH configuration information, the base station can reset (e.g., instruct) all or part of the parameters included in the legacy RACH configuration information for the SBFD terminal. The SBFD terminal can basically perform the RACH procedure based on the legacy RACH configuration information, and if the RACH configuration information for the SBFD terminal (e.g., SBFD RACH configuration information) is instructed, the RACH procedure can be performed based on the SBFD RACH configuration information.

[0204] To reduce the signaling overhead of RACH configuration information, the base station may additionally configure some parameters for the SBFD terminal in addition to the parameters included in the legacy RACH configuration information. For example, the base station may configure the frequency offset (e.g., frequency offset value) of the SBFD RO to the SBFD terminal. The frequency offset of the SBFD RO may refer to the frequency offset in the embodiment of FIG. 9a. The starting position of the frequency offset may be the starting frequency (e.g., starting frequency offset) of the legacy RO. The frequency offset may be configured based on the RB (resource block) based on the lowest subcarrier spacing (SCS) or the highest SCS.

[0205] The base station can additionally configure information about the validity rules of SSB (e.g., a rule for determining a valid RO based on SSB-RO mapping) for the SBFD terminal and transmit the information about the validity rules of SSB to the SBFD terminal through signaling. The SBFD terminal can receive information about the validity rules of SSB through signaling from the base station. The legacy terminal can ignore the parameter(s) configured for the SBFD terminal. The parameter(s) configured for the SBFD terminal can only be used by the SBFD terminal. For example, the legacy terminal can ignore the information about the validity rules, and the SBFD terminal can use the information about the validity rules.

[0206] A terminal (e.g., a legacy terminal and / or an SBFD terminal) may expect that an RO based on legacy RACH configuration information is configured based on a pattern regardless of the resource type (e.g., N-SBFD resource, SBFD resource). A terminal (e.g., a legacy terminal and / or an SBFD terminal) may expect that an RO based on SBFD RACH configuration information is not configured in an N-SBFD resource. If an RO based on SBFD RACH configuration information is configured in an N-SBFD resource, the terminal may not expect to transmit an RA preamble (e.g., msg1) in the RO configured in the N-SBFD resource.

[0207] Alternatively, the base station may transmit to the terminal via signaling (e.g., system information and / or RRC message) “information indicating that the RACH procedure can be performed in both the RO based on the legacy RACH configuration information and the RO based on the SBFD RACH configuration information” or “information indicating that the RACH procedure can be performed in one of the RO based on the legacy RACH configuration information and the RO based on the SBFD RACH configuration information.” The terminal may receive the above-described information via signaling from the base station, determine the RO(s) capable of performing the RACH procedure based on the above-described information, and perform the RACH procedure in the determined RO(s).

[0208] SBFD RO can also be configured in FL (flexible) resources (e.g., FL region, FL symbol). SBFD terminals can expect to transmit RA preambles in valid SBFD ROs configured in FL resources. Since the RACH procedure has random characteristics and FL resources are variable, in order to improve resource efficiency among terminals, SBFD terminals may not expect to transmit RA preambles using SBFD ROs configured in FL resources. ROs where the RA preamble of an SBFD terminal can be transmitted may exist not only in SBFD resources but also in N-SBFD resources (e.g., UL region and / or FL region). Legacy terminals may not expect to transmit msg1 in SBFD ROs. Legacy terminals and SBFD terminals can expect to transmit msg1 using ROs configured in FL resources.

[0209] An SBFD terminal may transmit an RA preamble in one or more of the ROs configured based on SBFD RACH configuration information. A legacy terminal may transmit an RA preamble in one or more of the ROs configured based on legacy RACH configuration information. In addition, the SBFD terminal may transmit an RA preamble in one or more of the ROs configured based on legacy RACH configuration information. Considering fairness between the SBFD terminal and the legacy terminal and / or collision between RA preambles, it may be instructed (e.g., configured) that the SBFD terminal not transmit an RA preamble in the ROs configured based on legacy RACH configuration information. In other words, transmission of an RA preamble of the SBFD terminal in the ROs configured based on legacy RACH configuration information may be restricted.

[0210] Method #8

[0211] The start time of a valid RO within a UL subband may be N symbols after the N-SBFD symbol on which the last DL transmission was performed. N may be a natural number. N may be defined in a technical specification. Alternatively, the base station may transmit information about N to the terminal through signaling (e.g., system information and / or RRC message). The terminal may receive information about N through signaling from the base station. The N symbols may be a delay time (e.g., a physical delay time) required for switching between DL transmission and UL transmission. The N symbols may be set to prevent interference due to the delay time.

[0212] The priority of SSB (e.g., SSB transmission) may be higher than the priority of the RACH procedure. In this case, M symbols before the SSB or M symbols after the SSB may be considered to determine a valid RO. M may be a natural number. M may be defined in the technical specification. Alternatively, the base station may transmit information about M to the UE through signaling (e.g., system information and / or RRC messages). The UE may receive information about M through the signaling from the base station. The UE may expect to receive the SSB in the RO that overlaps with the SSB. This is because the priority of synchronization (e.g., DL synchronization) is higher than that of the RACH procedure.

[0213] The base station can transmit to the terminal via signaling (e.g., system information and / or RRC message) information indicating that the SSB procedure takes precedence over the RACH procedure or information indicating that the RACH procedure takes precedence over the SSB. The terminal can receive, via signaling from the base station, information indicating that the SSB procedure takes precedence over the RACH procedure or information indicating that the RACH procedure takes precedence over the SSB. If the SSB procedure takes precedence over the RACH procedure, the terminal can expect to receive the SSB in the overlapping RO with the SSB. If the RACH procedure takes precedence over the SSB, the terminal can expect to perform the RACH procedure (e.g., transmitting msg1) in the overlapping RO with the SSB.

[0214] A UE may not expect to receive an RA preamble in an RO that overlaps with a guard band in the frequency domain. The UE may determine overlapping ROs (e.g., ROs that overlap with other resources) as invalid ROs. The base station may transmit the offset and / or threshold to the UE via signaling (e.g., system information and / or RRC messages). The UE may receive the offset and / or threshold via signaling from the base station. Alternatively, the offset and / or threshold may be defined in a technical specification. The offset and / or threshold may be used to determine the validity of an RO.

[0215] Method #9

[0216] A base station may transmit separate RACH configuration information for an SBFD terminal (e.g., SBFD RACH configuration information) to the SBFD terminal. An RO based on the SBFD RACH configuration information may be located within an SBFD resource and / or an N-SBFD resource. An SBFD terminal may not expect an RA preamble to be transmitted in an RO(s) located within an N-SBFD resource among the ROs based on the SBFD RACH configuration information. In other words, the SBFD terminal may determine (e.g., judge) an RO(s) located within an N-SBFD resource among the ROs based on the SBFD RACH configuration information as an invalid RO(s). Considering that the RACH procedure has a random characteristic, it may be allowed for an SBFD terminal to transmit an RA preamble in an RO(s) located within an N-SBFD resource among the ROs based on the SBFD RACH configuration information as well as in the ROs based on the legacy RACH configuration information.

[0217] A valid RO may refer to an RO that is completely within the UL usable PRB(s). If a portion of the RO belongs to the UL usable PRB(s), the RO may be an invalid RO. The UL usable PRB(s) may be a UL subband or an UL region within N-SBFD resources. The UE and / or the base station may determine an RO that partially overlaps with an SSB (e.g., SSB transmission, SSB resources) or an RO that completely overlaps with an SSB as an invalid RO.

[0218] An SBFD terminal may follow legacy SSB-RO mapping rules. An SBFD terminal may independently apply legacy SSB-RO mapping rules to the legacy RO and SBFD RO. If an SBFD terminal is allowed to transmit an RA preamble in the legacy RO as well as the SBFD RO, the base station may set a quality condition and / or a quality threshold (e.g., an RSRP condition and / or an RSRP threshold) to the SBFD terminal. For example, if the reception quality of the SBFD terminal satisfies the quality condition and / or the quality threshold, the SBFD terminal may transmit an RA preamble in the SBFD RO and the legacy RO. If the reception quality of the SBFD terminal does not satisfy the quality condition and / or the quality threshold, the SBFD terminal may transmit an RA preamble in the SBFD RO. In other words, if the reception quality of the SBFD terminal does not satisfy the quality condition and / or quality threshold, the SBFD terminal may not be able to transmit the RA preamble in the legacy RO.

[0219] An RSRP threshold (e.g., RSRP range) may be used to determine the number of repetitions of the RA preamble. The RA preamble may mean msg1 and / or msgA. The base station may configure multiple RSRP thresholds to the UE through signaling. For example, a first RSRP threshold (e.g., a first RSRP range), a second RSRP threshold (e.g., a second RSRP range), and / or a third RSRP threshold (e.g., a third RSRP range) may be configured to the UE. The RSRP threshold(s) (e.g., RSRP range(s)) for the SBFD RA procedure and the RSRP threshold(s) (e.g., RSRP range(s)) for the legacy RA procedure may be configured independently. The SBFD RACH configuration information may include the RSRP threshold(s) (e.g., RSRP range(s)) for the SBFD RA procedure. The legacy RACH configuration information may include RSRP threshold(s) (e.g., RSRP range(s)) for legacy RA procedures.

[0220] In another embodiment, the RSRP threshold(s) (e.g., RSRP range(s)) for the SBFD RA procedure and the RSRP threshold(s) (e.g., RSRP range(s)) for the legacy RA procedure may be included in BWP uplink common information (e.g., BWP-UplinkCommon). The base station may transmit BWP uplink common information including the RSRP threshold(s) (e.g., RSRP range(s)) for the SBFD RA procedure and the RSRP threshold(s) (e.g., RSRP range(s)) for the legacy RA procedure to the terminal. The terminal may receive the BWP uplink common information through signaling of the base station and may check information included in the BWP uplink common information.

[0221] The terminal can compare the measurement result (e.g., measured RSRP) for the signal (e.g., SSB, CSI-RS) received from the base station with RSRP threshold(s) (e.g., RSRP range(s)). If the measured RSRP belongs to the first RSRP range, the terminal can determine the number of repetition transmissions of the RA preamble as 2 and perform repeated transmissions for the RA preamble as many times as the number of repetition transmissions. If the measured RSRP belongs to the second RSRP range, the terminal can determine the number of repetition transmissions of the RA preamble as 4 and perform repeated transmissions for the RA preamble as many times as the number of repetition transmissions. If the measured RSRP belongs to the third RSRP range, the terminal can determine the number of repetition transmissions of the RA preamble as 8 and perform repeated transmissions for the RA preamble as many times as the number of repetition transmissions. Repeated transmissions for the RA preamble can be performed in SBFD ROs (e.g., additional ROs).

[0222] The number of repetitions of the RA preamble in the SBFD RA procedure and the number of repetitions of the RA preamble in the legacy RA procedure can be independently configured. Alternatively, the same number of repetitions of the RA preamble can be configured for the SBFD RA procedure and the legacy RA procedure. The SBFD RACH configuration information may include information indicating the number of repetitions of the RA preamble for the SBFD RA procedure. The legacy RACH configuration information may include information indicating the number of repetitions of the RA preamble for the legacy RA procedure. For another example, at least one of the SBFD RACH configuration information or the legacy RACH configuration information may include information indicating the same number of repetitions that is commonly applied to the SBFD RA procedure and the legacy RA procedure.

[0223] An SBFD terminal can repeatedly transmit an RA preamble as many times as the number of repetitions indicated by the SBFD RACH configuration information. In an SBFD terminal, repeated transmissions for the RA preamble may be performed in SBFD ROs (e.g., additional ROs). A legacy terminal can repeatedly transmit an RA preamble as many times as the number of repetitions indicated by the legacy RACH configuration information. In a legacy terminal, repeated transmissions for the RA preamble may be performed in the legacy ROs. If the above-described RSRP threshold(s) (e.g., RSRP range(s)) are not configured in the terminal, the terminal may repeatedly transmit an RA preamble as many times as the number of repetitions indicated by the RACH configuration information (e.g., SBFD RACH configuration information and / or legacy RACH configuration information).

[0224] An SBFD terminal can perform repeated transmission of msg1 within an SBFD resource. In other words, an SBFD terminal can perform repeated transmission of msg1 in an SBFD RO. A legacy RO may exist before the SBFD RO, and a legacy RO may exist after the SBFD RO. When repeated transmission of msg1 is performed, the type of RO (e.g., SBFD RO, legacy RO) in which msg1 is transmitted may change. For example, if a first transmission of msg1 is performed in an SBFD RO, a legacy RO exists after the SBFD RO, and a second transmission of msg1 having the same preamble format as the first transmission is possible in the legacy RO, the SBFD terminal can perform the second transmission of msg1 in the legacy RO. For another example, if a first transmission of msg1 is performed in a legacy RO, and a SBFD RO exists after the legacy RO, and a second transmission of msg1 having the same preamble format as the first transmission is possible in the SBFD RO, the SBFD terminal can perform the second transmission of msg1 in the SBFD RO. In other words, if transmission of msg1 having the same preamble format is possible in different types of ROs, the SBFD terminal can repeatedly transmit msg1 in different types of ROs. The first transmission can be an initial transmission or a retransmission of msg1, and the second transmission can be a retransmission of the first transmission.

[0225] In the case where the RO type is changed in the msg1 repetition transmission procedure, the SBFD terminal can perform msg1 repetition transmission using ROs capable of transmitting msg1 with the same preamble format within the allowed time resources. The SBFD terminal can transmit msg1 as many times as the number of msg1 repetitions (e.g., the maximum number of msg1 repetitions) associated with the PRACH configuration index (e.g., the existing PRACH configuration index, the legacy PRACH configuration index). If a resource constraint occurs due to a change in the RO type, the SBFD terminal can transmit msg1 less than the number of msg1 repetitions (e.g., the maximum number of msg1 repetitions).

[0226] Method #10

[0227] Not only UEs in an RRC connected state, but also UEs in an RRC inactive state or an RRC idle state (e.g., an SBFD UE) can support the RACH procedure. The base station can configure resources for the RACH procedure of a UE in an RRC inactive state or an RRC idle state (e.g., an SBFD UE) using an RRC release message. In other words, the RRC release message can include resource configuration information for the RACH procedure of a UE in an RRC inactive state or an RRC idle state (e.g., an SBFD UE). Alternatively, a UE in an RRC inactive state or an RRC idle state (e.g., an SBFD UE) can perform the RACH procedure based on RACH configuration information configured for a UE in an RRC connected state.

[0228] Figure 15 is a flowchart illustrating embodiments of the RA procedure.

[0229] Referring to FIG. 15, the base station can generate legacy RACH configuration information and SBFD RACH configuration information (S1501). The legacy RACH configuration information and the SBFD RACH configuration information can be configured independently. For example, the parameter(s) included in the legacy RACH configuration information can be configured differently from the parameter(s) included in the SBFD RACH configuration information. Each of the legacy RACH configuration information and the SBFD RACH configuration information can include repetition transmission information. The repetition transmission information can include information required for repeated transmission of an RA preamble (e.g., msg1 and / or msgA). The repetition transmission information can include at least one of information indicating the number of repeated transmissions of the RA preamble (hereinafter, referred to as “repetition number information”) or one or more RSRP thresholds (e.g., one or more RSRP ranges) for determining the number of repeated transmissions of the RA preamble. One or more RSRP thresholds may be included in other information (e.g., BWP uplink common information) instead of RACH configuration information (e.g., legacy RACH configuration information and / or SBFD RACH configuration information).

[0230] The repetition count information for the legacy RACH procedure and the repetition count information for the SBFD RACH procedure can be independently configured. Alternatively, the same repetition count information can be configured for the legacy RACH procedure and the SBFD RACH procedure. One or more RSRP thresholds for the legacy RACH procedure and one or more RSRP thresholds for the SBFD RACH procedure can be independently configured. The repetition count information can indicate 2, 4, or 8. The one or more RSRP thresholds can include a first RSRP threshold (e.g., a first RSRP range), a second RSRP threshold (e.g., a second RSRP range), and a third RSRP threshold (e.g., a third RSRP range). If the RSRP measured at the UE satisfies the first RSRP threshold (e.g., based on the RSRP measured at the UE satisfying the first RSRP threshold), the number of repetition transmissions of the RA preamble can be determined as 2. If the RSRP measured at the terminal satisfies the second RSRP threshold (e.g., based on the RSRP measured at the terminal satisfying the second RSRP threshold), the number of repetitions of the RA preamble may be determined to be 4. If the RSRP measured at the terminal satisfies the third RSRP threshold (e.g., based on the RSRP measured at the terminal satisfying the third RSRP threshold), the number of repetitions of the RA preamble may be determined to be 8.

[0231] The base station may transmit legacy RACH configuration information and SBFD RACH configuration information to the terminal through signaling (S1502). The terminal may receive the legacy RACH configuration information and SBFD RACH configuration information through signaling from the base station, and may check information (e.g., repetition transmission information) included in each of the legacy RACH configuration information and the SBFD RACH configuration information. In another embodiment, separately from the transmission of the legacy RACH configuration information and the SBFD RACH configuration information, the base station may transmit configuration information (e.g., BWP uplink common information) to the terminal, including one or more RSRP thresholds (e.g., one or more RSRP ranges) for determining the number of repetitions of the RA preamble. The terminal may receive one or more RSRP thresholds (e.g., one or more RSRP ranges) for determining the number of repetitions of the RA preamble from the base station. The RA preamble may mean msg1 and / or msgA. In other words, repeated transmission of the RA preamble may mean repeated transmission of msg1 and / or repeated transmission of msgA.

[0232] Information included in RACH configuration information (e.g., legacy RACH configuration information and SBFD RACH configuration information) may indicate repeated transmission of an RA preamble. Based on the RACH configuration information indicating repeated transmission of an RA preamble, the terminal may perform repeated transmission of the RA preamble (S1503). Based on the RACH configuration information indicating repeated transmission of the RA preamble, the terminal may determine an RO type (e.g., SBFD RO and / or legacy RO) in which repeated transmission of the RA preamble is performed, and may perform repeated transmission of the RA preamble in an RO corresponding to the determined RO type (e.g., SBFD RO and / or legacy RO). An SBFD terminal may determine the RO type as SBFD RO. Alternatively, the SBFD terminal may determine the RO type as legacy RO. An N-SBFD terminal may determine the RO type as legacy RO. Repeated transmission of the RA preamble may not be performed across SBFD ROs and legacy ROs. Repeated transmission of the RA preamble can be classified into Case A and Case B below.

[0233] ◆ Case A: When one or more RSRP thresholds (e.g., one or more RSRP ranges) for determining the number of repeated transmissions of the RA preamble are not set in the terminal, and the number of repeated transmissions is set in the terminal.

[0234] A terminal (e.g., an SBFD terminal) can perform repeated transmissions of an RA preamble for the number of repetitions indicated by the base station (S1503). The base station can perform a reception operation for the RA preamble based on the number of repetitions indicated to the terminal (S1503). In other words, the base station can expect that the terminal will repeatedly transmit the RA preamble in Case A, and can perform a reception operation for the RA preamble based on the expectation (S1503). The reception operation for the RA preamble can be performed in the SBFD RO or the legacy RO. If the terminal supports the SBFD operation (e.g., based on the terminal supporting the SBFD operation), the base station can expect to receive the RA preamble in the SBFD RO. Alternatively, if the terminal supports the SBFD operation (e.g., based on the terminal supporting the SBFD operation), the base station can expect to receive the RA preamble in the legacy RO. If the UE does not support SBFD operation (e.g., based on the UE not supporting SBFD operation), it can expect to receive the RA preamble in the legacy RO. The base station may not expect to receive the RA preamble across the SBFD RO and the legacy RO (e.g., the RA preamble for one UE, in the same RA procedure).

[0235] The SBFD terminal can determine an RO in which repeated transmission of the RA preamble is performed among ROs (e.g., legacy RO and / or SBFD RO) indicated by RACH configuration information (e.g., legacy RACH configuration information and / or SBFD RACH configuration information). The SBFD terminal can determine the SBFD RO as an RO in which repeated transmission of the RA preamble is performed. In this case, the SBFD terminal can perform repeated transmission for the RA preamble in the SBFD ROs (e.g., additional ROs). Alternatively, the SBFD terminal can determine the legacy RO as an RO in which repeated transmission of the RA preamble is performed. In this case, the SBFD terminal can perform repeated transmission for the RA preamble in the legacy ROs. Repeated transmission for the RA preamble may not be performed across the SBFD RO and the legacy RO. In other words, if the first transmission for the RA preamble is performed in an SBFD RO, retransmission for the first transmission may not be performed in a legacy RO. For another example, if the first transmission for the RA preamble is performed in a legacy RO, retransmission for the first transmission may not be performed in a SBFD RO. Repeated transmissions for the RA preamble may be performed in a RO corresponding to one RO type (e.g., an SBFD RO or a legacy RO), and may not be performed in ROs corresponding to all RO types (e.g., an SBFD RO and a legacy RO).

[0236] ◆ Case B: "When one or more RSRP thresholds (e.g., one or more RSRP ranges) and the number of repetitions for determining the number of repetitions of the RA preamble are set in the terminal" or "When one or more RSRP thresholds (e.g., one or more RSRP ranges) for determining the number of repetitions of the RA preamble are set in the terminal, and the number of repetitions is not set in the terminal."

[0237] In Case B, the terminal may determine the number of repetitions of the RA preamble based on one or more RSRP thresholds (e.g., one or more RSRP ranges) for determining the number of repetitions of the RA preamble. The terminal may perform measurement on a signal (e.g., SSB and / or CSI-RS) received from the base station and compare the measurement result (e.g., measured RSRP) with the RSRP ranges. If the measured RSRP belongs to a first RSRP range (e.g., based on the measured RSRP belonging to the first RSRP range), the terminal may determine the number of repetitions of the RA preamble to be 2 and may repeatedly transmit the RA preamble twice (S1503). If the measured RSRP belongs to the second RSRP range (e.g., based on the measured RSRP belonging to the second RSRP range), the terminal may determine the number of repetitions of the RA preamble to be 4, and may repeatedly transmit the RA preamble 4 times (S1503). If the measured RSRP belongs to the third RSRP range (e.g., based on the measured RSRP belonging to the third RSRP range), the terminal may determine the number of repetitions of the RA preamble to be 8, and may repeatedly transmit the RA preamble 8 times (S1503).

[0238] The SBFD terminal can determine an RO in which repeated transmission of the RA preamble is performed among ROs (e.g., legacy RO and / or SBFD RO) indicated by RACH configuration information (e.g., legacy RACH configuration information and / or SBFD RACH configuration information). The SBFD terminal can determine the SBFD RO as an RO in which repeated transmission of the RA preamble is performed. In this case, repeated transmission of the RA preamble in S1503 may be performed in SBFD ROs (e.g., additional ROs). Alternatively, the SBFD terminal can determine the legacy RO as an RO in which repeated transmission of the RA preamble is performed. In this case, repeated transmission of the RA preamble in S1503 may be performed in legacy ROs. Repeated transmission of the RA preamble in S1503 may not be performed across the SBFD RO and the legacy RO. In other words, if the first transmission for the RA preamble is performed in the SBFD RO, the retransmission for the first transmission may not be performed in the legacy RO. For another example, if the first transmission for the RA preamble is performed in the legacy RO, the retransmission for the first transmission may not be performed in the SBFD RO.

[0239] The base station may perform a reception operation for the RA preamble based on the RSRP threshold(s) and / or the number of repetition transmissions instructed to the terminal (S1503). In other words, the base station may expect that the terminal will repeatedly transmit the RA preamble in Case B, and may perform a reception operation for the RA preamble based on the expectation (S1503). The reception operation for the RA preamble may be performed in the SBFD RO or the legacy RO. If the terminal supports the SBFD operation (e.g., based on the terminal supporting the SBFD operation), the base station may expect to receive the RA preamble in the SBFD RO. Alternatively, if the terminal supports the SBFD operation (e.g., based on the terminal supporting the SBFD operation), the base station may expect to receive the RA preamble in the legacy RO. If the terminal does not support the SBFD operation (e.g., based on the terminal not supporting the SBFD operation), the base station may expect to receive the RA preamble in the legacy SBFD RO. The base station may not expect to receive an RA preamble (e.g., an RA preamble for a single terminal, an RA preamble in the same RA procedure) across the SBFD RO and the legacy RO. After S1503 is completed, the remaining RA procedures (e.g., the transmission and reception operations of msg2, the transmission and reception operations of msg3, the transmission and reception operations of msg4, and / or the transmission and reception operations of msgB) between the base station and the terminal may be performed (S1504).

[0240] In the present disclosure, a UL subband may refer to a UL subband for SBFD operation. In the present disclosure, a terminal may transmit information indicating whether it supports the function(s) proposed in the present 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 a 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)).

[0241] The configuration for the UL subband (e.g., SBFD configuration) can be transmitted via signaling (e.g., RRC signaling). The SBFD configuration can be transmitted after the transmission of the TDD common configuration. The methods proposed in this disclosure can be applied to unlicensed bands as well as licensed bands. The methods proposed in this disclosure can be applied to sidelink and / or supplementary uplink (SUL). For example, the methods proposed in this disclosure can be applied to determine transmit power in sidelink and / or SUL. Each of the proposals of this disclosure can be applied independently, or a combination of the proposals of this disclosure can be applied. Some proposals of this disclosure can be applied to other proposals. The proposals of this disclosure can be applied regardless of the RRC state of the terminal. For example, a terminal in an RRC idle state, an RRC inactive state, and / or an RRC connected state can perform the proposals of this disclosure. A base station can perform the proposals of the present disclosure for a terminal in an RRC idle state, a terminal in an RRC inactive state, and / or a terminal in an RRC connected state.

[0242] 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.

[0243] 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.

[0244] 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.

[0245] 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.

[0246] 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 RACH (random access channel) setting information from a base station; A step of determining an RO (RACH occasion) type in which repeated transmission of the RA preamble is performed based on the above RACH configuration information indicating repeated transmission of the RA (random access) preamble; and Comprising a step of performing repeated transmission for the RA preamble in the RO corresponding to the RO type, UE's method.

2. In claim 1, The above RO type is SBFD (subband full duplex) RO (RACH occasion) or legacy RO, and the UE supporting SBFD operation determines the RO type as the SBFD RO. UE's method.

3. In claim 1, Repeated transmission for the above RA preamble is performed in one of the RO types, SBFD RO or legacy RO, and repeated transmission for the above RA preamble is not performed across the SBFD RO and the legacy RO. UE's method.

4. In claim 1, The RACH configuration information includes SBFD RACH configuration information and legacy RACH configuration information, the SBFD RACH configuration information includes information for an SBFD RA procedure of a UE supporting an SBFD operation, and the legacy RACH configuration information includes information for a legacy RA procedure of a UE not supporting the SBFD operation. UE's method.

5. In claim 4, Each of the SBFD RACH configuration information and the legacy RACH configuration information includes at least one of one or more RSRP (reference signal received power) thresholds used to determine the number of repeated transmissions of the RA preamble or the number of repeated transmissions of the RA preamble. UE's method.

6. In claim 5, The one or more RSRP thresholds for the SBFD RA procedure are set independently from the one or more RSRP thresholds for the legacy RA procedure. UE's method.

7. In claim 5, The number of repetition transmissions for the SBFD RA procedure is set independently from the number of repetition transmissions for the legacy RA procedure. UE's method.

8. In claim 5, The above number of repetition transmissions is applied equally in the above SBFD RA procedure and the above legacy RA procedure. UE's method.

9. As a method of base station, Step of generating RACH (random access channel) configuration information; A step of transmitting the above RACH configuration information to UE (user equipment); and A step of receiving the RA preamble from the UE in a subband full duplex (SBFD) RO (RACH occasion) or legacy RO in which repeated transmission of the RA preamble is performed based on the RACH configuration information indicating repeated transmission of the RA (random access) preamble, Base station method.

10. In claim 9, Based on the UE supporting SBFD operation, the RA preamble is expected to be received in the SBFD RO, and repeated transmissions for the RA preamble are not received across the SBFD RO and the legacy RO. Base station method.

11. In claim 9, The RACH configuration information includes SBFD RACH configuration information and legacy RACH configuration information, the SBFD RACH configuration information includes information for an SBFD RA procedure of a UE supporting an SBFD operation, and the legacy RACH configuration information includes information for a legacy RA procedure of a UE not supporting the SBFD operation. Base station method.

12. In claim 11, Each of the SBFD RACH configuration information and the legacy RACH configuration information includes at least one of one or more RSRP (reference signal received power) thresholds used to determine the number of repeated transmissions of the RA preamble or the number of repeated transmissions of the RA preamble. Base station method.

13. In claim 11, The one or more RSRP thresholds for the SBFD RA procedure are set independently from the one or more RSRP thresholds for the legacy RA procedure. Base station method.

14. In claim 11, The number of repetition transmissions for the SBFD RA procedure is set independently from the number of repetition transmissions for the legacy RA procedure. Base station method.

15. In claim 11, The above number of repetition transmissions is applied equally in the above SBFD RA procedure and the above legacy RA procedure. Base station method.

16. As UE (user equipment), Contains at least one processor, At least one of the above processors is configured such that the UE, Receive RACH (random access channel) configuration information from the base station; Based on the above RACH configuration information indicating repeated transmission of the RA (random access) preamble, the RO (RACH occasion) type in which repeated transmission of the RA preamble is performed is determined; and Causing repeated transmission of the RA preamble in the RO corresponding to the above RO type, UE.

17. In claim 16, The above RO type is SBFD (subband full duplex) RO (RACH occasion) or legacy RO, and the UE supporting SBFD operation determines the RO type as the SBFD RO. UE.

18. In claim 16, Repeated transmission for the above RA preamble is performed in one of the RO types, SBFD RO or legacy RO, and repeated transmission for the above RA preamble is not performed across the SBFD RO and the legacy RO. UE.

19. In claim 16, The RACH configuration information includes SBFD RACH configuration information and legacy RACH configuration information, and each of the SBFD RACH configuration information and the legacy RACH configuration information includes one or more RSRP (reference signal received power) thresholds used to determine the number of times of repeated transmission of the RA preamble, and the one or more RSRP thresholds for the SBFD RA procedure based on the SBFD RACH configuration information are set independently from the one or more RSRP thresholds for the legacy RA procedure based on the legacy RACH configuration information. UE.

20. In claim 16, The RACH configuration information includes SBFD RACH configuration information and legacy RACH configuration information, and each of the SBFD RACH configuration information and the legacy RACH configuration information includes the number of repetition transmissions of the RA preamble, and the number of repetition transmissions for the SBFD RA procedure based on the SBFD RACH configuration information is set independently from the number of repetition transmissions for the legacy RA procedure based on the legacy RACH configuration information. UE.

Images