Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives at least one of trigger signal-related configuration information and system information-related configuration information, the trigger signal-related configuration information and the system information-related configuration information being included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block; a transmission unit that transmits a trigger signal on the basis of the trigger signal-related configuration information; and a control unit that controls reception of system information transmitted in response to the trigger signal.

Description

Terminal, wireless communication method and base station

[0001] The present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system.

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] In future wireless communication systems (5G Beyond / 6G and beyond), it is required to realize low power consumption of networks / base stations. For example, it is expected that the networks / base stations will transmit predetermined DL signals / channels in response to a request / trigger from a terminal (user terminal, User Equipment (UE)) (on-demand).

[0006] However, there has been insufficient consideration of on-demand communication control in response to such requests / triggers from the UE.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately perform communication control in response to a request / trigger from a UE.

[0008] A terminal according to one aspect of the present disclosure has a receiving unit that receives at least one of setting information regarding a trigger signal and setting information regarding system information included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block, a transmitting unit that transmits a trigger signal based on the setting information regarding the trigger signal, and a control unit that controls the reception of the system information transmitted in response to the trigger signal.

[0009] According to one aspect of the present disclosure, communication control can be appropriately performed in response to a request / trigger from a UE.

[0010] FIG. 1 is a diagram illustrating an example of an initial access / random access procedure supported by an existing system. FIG. 2 is a diagram illustrating another example of an initial access / random access procedure supported by an existing system. FIG. 3 is a diagram illustrating an example of communication control using a trigger signal according to a first embodiment. FIG. 4 is a diagram illustrating another example of communication control using a trigger signal according to the first embodiment. FIG. 5 is a diagram illustrating an example of a case where FDM / TDM is applied to a trigger signal (e.g., PRACH) and a synchronization signal block according to a third embodiment. FIG. 6 is a diagram illustrating an example of communication control using a trigger signal according to a fourth embodiment. FIG. 7 is a diagram illustrating another example of communication control using a trigger signal according to the fourth embodiment. FIG. 8 is a diagram illustrating another example of communication control using a trigger signal according to the fourth embodiment. FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 11 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 12 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 13 is a diagram illustrating an example of a vehicle according to an embodiment.

[0011] (Initial Access Procedure) In the initial access procedure of 5G NR, a UE (e.g., in RRC_IDLE mode) performs a random access procedure after receiving a synchronization signal block (e.g., SS / PBCH block (SSB)) / system information (e.g., SIB) (see FIG. 1).

[0012] SSB reception includes PSS detection, SSS detection, PBCH-DMRS detection, and PBCH reception. PSS detection includes detecting part of the physical cell ID (PCI), detecting (synchronizing) OFDM symbol timing, and (coarse) frequency synchronization. SSS detection includes detecting the physical cell ID. PBCH-DMRS detection includes detecting (part of) the SSB index within a half radio frame (5 ms). PBCH reception includes detecting the system frame number (SFN) and radio frame timing (SSB index), receiving configuration information for receiving remaining minimum system information (RMSI, SIB1), and recognizing whether the UE can camp on that cell (carrier).

[0013] SSB has a bandwidth of 20 RBs and a time of 4 symbols. The transmission period of SSB can be set to {5, 10, 20, 40, 80, 160} ms. In a half frame, multiple symbol positions of SSB are defined based on the frequency range (FR1, FR2).

[0014] The PBCH has a payload of 56 bits. N repetitions of the PBCH are transmitted within a period of 80 ms, where N depends on the SSB transmission period.

[0015] The system information consists of the MIB, RMSI (SIB1), and other system information (OSI) carried by the PBCH. SIB1 contains information for RACH setup and RACH procedures. The time / frequency resource relationship between the SSB and the PDCCH monitoring resource for SIB1 is configured by the PBCH. After receiving the SSB, the UE controls the reception of SIB1 based on the information contained in the SSB.

[0016] The PDSCH carrying SIB1 (SIB1 PDSCH) is transmitted periodically. This PDSCH is scheduled by Type 0-PDCCH. One SSB corresponds to one SIB1 PDSCH. One SIB1 PDSCH may or may not be repeated twice.

[0017] A base station using beam correspondence transmits multiple SSBs using multiple beams (analog beams) for each SSB transmission period. The multiple SSBs may be referred to as SSB bursts. The multiple SSBs have multiple SSB indices, respectively. A UE that detects an SSB transmits a PRACH in the RACH occasion associated with that SSB index and receives an RAR (or message 2) in the RAR window.

[0018] (Random Access Procedure) In the random access procedure, the UE transmits message (Msg.) 1 (PRACH / random access preamble / preamble), receives Msg. 2 (PDCCH, PDSCH including random access response (RAR)), transmits Msg. 3 (PUSCH scheduled by RAR UL grant), and receives Msg. 4 (PDCCH, PDSCH including UE contention resolution identity) (see Fig. 1). After that, when the UE transmits an ACK for Msg. 4, an RRC connection is established (RRC_CONNECTED mode).

[0019] Random access procedures include contention-based random access (also called contention-based random access (CBRA)) and non-contention-based random access (non-CBRA, also called contention-free random access (CFRA)).

[0020] In contention-based random access (CBRA), a UE terminal transmits a preamble randomly selected from a plurality of preambles (also called random access preambles, random access channel (Physical Random Access Channel (PRACH)), RACH preambles, etc.) defined for each cell. Contention-based random access is a UE-initiated random access procedure, and can be used, for example, at the time of initial access, at the start or restart of UL transmission, etc.

[0021] On the other hand, in non-contention random access (Non-CBRA, CFRA), a radio base station allocates a preamble to a UE specifically via a downlink (DL) control channel (Physical Downlink Control Channel (PDCCH)), and the UE transmits the preamble allocated by the radio base station. Non-contention random access is a network-initiated random access procedure, and can be used, for example, at the time of handover, at the start or restart of DL transmission (at the start or restart of UL transmission of DL retransmission instruction information), etc.

[0022] In FIG. 1 , the UE receives in advance information (PRACH configuration information) indicating the configuration of a random access channel (PRACH) (PRACH configuration, RACH configuration) through system information (e.g., MIB (Material Information Block) and / or SIB (System Information Block)) or higher layer signaling (e.g., RRC (Radio Resource Control) signaling).

[0023] The PRACH configuration information can indicate, for example, multiple preambles (e.g., preamble formats) defined for each cell, time resources (e.g., system frame numbers, subframe numbers) and frequency resources (e.g., an offset (prach-FrequencyOffset) indicating the starting position of six resource blocks (PRBs: Physical Resource Blocks)) used for PRACH transmission, etc.

[0024] When the UE transitions from an idle (RRC_IDLE) state to an RRC connected (RRC_CONNECTED) state (e.g., at the time of initial access), or when the UE is in an RRC connected state but UL synchronization is not established (e.g., at the start or restart of UL transmission), the UE randomly selects one of the multiple preambles indicated by the PRACH configuration information and transmits the selected preamble via the PRACH (Message 1, Msg. 1).

[0025] When the radio base station detects the preamble, it transmits a Random Access Response (RAR) in response (Message 2, Msg. 2). If the UE fails to receive the RAR within a predetermined period (RAR window) after transmitting the preamble, it increases the transmission power of the PRACH and retransmits the preamble. Increasing the transmission power during retransmission is also called power ramping.

[0026] Upon receiving the RAR, the UE adjusts its UL transmission timing based on the timing advance (TA) included in the RAR to establish UL synchronization. The UE also transmits a control message (Message 3, Msg. 3) of the upper layer (L2 / L3: Layer 2 / Layer 3) using the UL resource specified by the UL grant included in the RAR. The control message includes the UE's identifier (UE-ID). The UE's identifier may be, for example, a Cell-Radio Network Temporary Identifier (C-RNTI) if the UE is in an RRC connected state, or a UE-ID of an upper layer such as a System Architecture Evolution-Temporary Mobile Subscriber Identity (S-TMSI) if the UE is in an idle state.

[0027] The radio base station transmits a collision resolution message (message 4, Msg. 4) in response to a control message from a higher layer. The collision resolution message is transmitted based on the UE identifier included in the control message. A UE that successfully detects the collision resolution message transmits an acknowledgement (ACK) in Hybrid Automatic Repeat reQuest (HARQ) to the radio base station. As a result, the UE in idle state transitions to an RRC connected state.

[0028] On the other hand, a UE that fails to detect the collision resolution message determines that a collision has occurred, reselects a preamble, and repeats the random access procedure of messages 1 to 4. When the radio base station detects that the collision has been resolved by an ACK from the UE, it transmits an UL grant to the UE. The UE transmits UL data using the UL resources allocated by the UL grant.

[0029] In the above-described contention-based random access, a UE can autonomously initiate a random access procedure when it desires to transmit UL data. Furthermore, after UL synchronization is established, the UL data is transmitted using UL resources that are specifically allocated to the UE by an UL grant, thereby enabling highly reliable UL transmission.

[0030] A random access procedure using transmission of Msg. 1, reception of Msg. 2, transmission of Msg. 3, and reception of Msg. 4 is also called a four-step random access procedure, a four-step random access procedure, a four-step RACH, or a four-step random access (RA).

[0031] (Analysis) In future wireless communication systems (Beyond 5G / 6G), reducing power consumption (for example, transmission power) in networks / base stations is one of the challenges.

[0032] For example, in existing systems (5G), DL transmission of broadcast information (e.g., SSB / system information) is always transmitted at a predetermined period (see FIG. 2). For initial access by UEs, the base station needs to periodically transmit and receive signals / channels. Furthermore, when the base station performs beamforming, periodic transmission / reception is required for each beam, which increases overhead / power consumption at the base station.

[0033] In order to reduce power consumption in the network / base station, it is also assumed that a base station / cell transmits a predetermined DL signal / channel in response to a request / trigger from the UE (on-demand). By operating the network / base station only in a place and time where the UE is present, communication can be performed with minimal power consumption.

[0034] However, when on-demand communication control is performed in response to a request / trigger from a UE, how to control the communication becomes a problem.

[0035] For example, in existing systems, a base station always transmits an SS / PBCH block (e.g., a Master Information Block (MIB)) and system information (e.g., a System Information Block (SIB)) at a predetermined period, and a UE can make initial access by receiving the SS / PBCH block and system information (e.g., a PDCCH and a SIB1 PDSCH). When a predetermined DL signal / channel (e.g., system information, etc.) is transmitted in response to a request / trigger from the UE, how to control communication becomes an issue.

[0036] If on-demand communication control is not performed appropriately in response to a request / trigger from a UE, there is a risk of increased power consumption and deterioration of communication quality (e.g., delays).

[0037] Therefore, the present inventors have considered ways to solve this problem and have come up with the present embodiment. According to one aspect of the present disclosure, communication control can be appropriately performed in response to a request / trigger from a UE.

[0038] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0039] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0040] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0041] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0042] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0043] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocol (e.g., NR Positioning Protocol A (NRPPa) / LTE Positioning Protocol (LPP)) messages), or a combination thereof.

[0044] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0045] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0046] In the present disclosure, the terms carrier, band, cell, frequency, etc. may be interchangeable. In the present disclosure, the terms synchronization signal block, SS / PBCH block, SSB, SS / PBCH, etc. may be interchangeable.

[0047] In the present disclosure, a cell may refer to a cell or supercell whose configuration / physical range does not change (in a cell-free configuration), or may refer to a cell, subcell, or area whose configuration / physical range may change (in a cell-free configuration). Therefore, in the present disclosure, cell, supercell, subcell, area, etc. may be read as interchangeable terms.

[0048] In the present disclosure, Msg. 1, PRACH, random access preamble, preamble, signal related to procedure A, procedure A, first message, etc. may be read interchangeably.

[0049] In the present disclosure, Msg. 2, a PDCCH associated with an RAR, an RAR, a PDSCH including an RAR, a response to Msg. 1, a signal related to procedure B, procedure B, a second message, and the like may be read interchangeably.

[0050] In the present disclosure, Msg. 3, PUSCH scheduled by RAR UL grant, response to Msg. 2, signal related to procedure C, procedure C, third message, etc. may be read interchangeably.

[0051] In the present disclosure, Msg. 4, Msg. 4 PDCCH, PDSCH including UE contention resolution identity, response to Msg. 3, signaling related to procedure D, procedure D, fourth message, etc. may be read interchangeably.

[0052] In the present disclosure, system information, system information block (SIB), SIB1, SIB based on SIB1 (SIBx (x is an integer of 2 or more)), etc. may be read interchangeably.

[0053] (Wireless communication method) The UE may transmit a signal that triggers a predetermined DL signal / DL channel transmitted from a base station. The signal that triggers the predetermined DL signal / predetermined DL channel transmitted from the base station may be called at least one of a trigger signal, a request signal, and a wake-up signal (WUS).

[0054] In the following description, a base station may be read as a network or a cell (primary cell / secondary cell). In the following description, a signal that triggers a predetermined DL signal / predetermined DL channel transmitted from a base station will be referred to as a trigger signal, but is not limited to this.

[0055] The UE may transmit a trigger signal before initially accessing a base station / cell. If the UE is connected to a radio access technology (RAT) / carrier / cell other than the base station / cell, the UE may synchronize to the base station / cell based on the other RAT / carrier / cell (or a signal from the other RAT / carrier / cell).

[0056] When a specific DL signal / specific DL channel transmitted from a certain base station / cell is made on-demand, the UE may perform initial access (or transmit a trigger signal) to the certain base station / cell after performing time / frequency synchronization based on another RAT / base station / cell.

[0057] In the present disclosure, the UE may determine a base station to transmit a trigger signal based on information notified from another RAT / base station / cell. Alternatively, in the present disclosure, a base station that starts transmitting a predetermined DL signal / DL channel based on a trigger signal transmitted from the UE may transmit a signal (e.g., a discovery signal) to notify the UE of the presence of the base station. In this case, the UE may control transmission of the trigger signal (e.g., determine a base station / cell to transmit a trigger signal) based on the discovery signal transmitted from the base station.

[0058] In the following description, initial access to a certain base station / cell will be taken as an example, but the present embodiment may be applied to cases other than initial access. The first to fourth embodiments may be implemented independently or in combination.

[0059] First Embodiment The first embodiment relates to an example of a case where transmission of a predetermined DL signal / channel is made on-demand.

[0060] The predetermined DL signal / DL channel may be, for example, information about the system of the cell, which may be at least one of SIB, SIB1, RMSI, PDCCH, and data channel / common channel (e.g., PDSCH).

[0061] The network (e.g., a base station) may control not to periodically transmit information about the system (hereinafter also referred to as system information or SIB). For example, at least one of the PDSCH on which the system information is transmitted and the PDCCH that schedules the PDSCH may be transmitted on demand.

[0062] The base station may perform control so that the SIB is transmitted when a predetermined trigger occurs (or when a predetermined condition is satisfied).

[0063] On-demand transmission of system information may be supported only in a specific cell / CC (e.g., SpCell or SCell) or may be supported in all cells / CCs. The cells / CCs to which on-demand transmission of system information applies may be defined in a specification, or may be configured / instructed by the base station to the terminal by RRC parameters / MAC CE / DCI.

[0064] The predetermined occasion / predetermined condition may be reception of a trigger signal from the UE. The UE may transmit a signal that triggers transmission of a predetermined DL signal / DL channel from the base station (or a signal that wakes up the base station).

[0065] The trigger signal may be a signal / channel (e.g., PRACH) used in the random access procedure, or may be a dedicated / newly introduced signal / channel. The trigger signal (or the relationship between the trigger signal and the system information) transmitted from the UE to the base station may be at least one of the following options 1-1 to 1-4.

[0066] [Option 1-1] The trigger signal and system-related information (e.g., SIB) triggered by the trigger signal (or transmitted on demand) may be transmitted in the same frequency / carrier / cell. For example, the UE may transmit the trigger signal in the frequency / carrier / cell in which the triggering system information is transmitted. The base station may control the system information to be transmitted in the frequency / carrier / cell in which the trigger signal from the UE is received.

[0067] [Option 1-2] The trigger signal and system-related information (e.g., SIB) triggered by the trigger signal (or transmitted on demand) may be transmitted on different frequencies / carriers / cells. For example, the UE may transmit the trigger signal on a frequency / carrier / cell different from the frequency / carrier / cell on which the triggering system information is transmitted. The base station may control the system information to be transmitted on a frequency / carrier / cell different from the frequency / carrier / cell on which the trigger signal from the UE is received.

[0068] [Options 1-3] The trigger signal and information (e.g., SIB) related to the system triggered by the trigger signal (or transmitted on demand) may be transmitted in different RATs / communication systems. For example, the UE may transmit the trigger signal in a RAT / communication system different from the RAT / communication system in which the triggering system information is transmitted. The base station may control the system information to be transmitted in a RAT / communication system different from the RAT / communication system in which the trigger signal from the UE is received.

[0069] [Option 1-4] Transmission and reception of trigger signals / system information may be controlled based on information obtained by an application or the like.

[0070] In at least one of Option 1-2 to Option 1-4, the UE may receive configuration information for the system information, including at least one of information on frequency resources / time resources corresponding to the system information and information on reception (e.g., occasion / monitoring opportunity), and the configuration information for the system information may be received on a carrier / cell / RAT different from the carrier / cell / RAT on which the system information is transmitted.

[0071] For example, the UE may receive (or monitor) system information transmitted in a second carrier / cell / RAT based on configuration information acquired in a first carrier / cell / RAT. In this case, the UE may perform frequency synchronization / time synchronization using a synchronization signal (SS) in the second carrier / cell / RAT from which the UE receives the system information. Information related to the synchronization signal may be transmitted from a base station to the UE in a different carrier / cell / RAT.

[0072] The UE may perform frequency synchronization / time synchronization using a synchronization signal in the carrier / cell / RAT etc. from which it wishes to receive system information, and may acquire information on PDCCH resources based on a broadcast channel (e.g., PBCH) etc.

[0073] Alternatively, the UE may control synchronization of the second carrier / cell / RAT using synchronization obtained on a carrier / cell / RAT different from the second carrier / cell / RAT on which the UE receives system information.

[0074] [Transmission of System Information] The base station may start transmitting system information based on a predetermined opportunity / predetermined condition (for example, after receiving a trigger signal from the UE).

[0075] A predetermined period (e.g., a time window) corresponding to at least one of the system information and the PDCCH scheduling the system information may be provided, and the UE / base station may be controlled to receive (or monitor) / transmit the system information during the predetermined period (e.g., the time window).

[0076] The base station may transmit system information / PDCCH in a predetermined period (e.g., a time window). Repeated transmission (e.g., repetition) may be applied to the system information / PDCCH. The condition for repeated transmission (e.g., the number of transmissions) may be defined in a specification, or may be configured / instructed by the base station to the UE. In this case, at least a part of the system information / PDCCH may be included in the predetermined period (e.g., a time window). For example, the initial transmission (or the initial transmission occasion) may be included in the predetermined period, and repeated transmissions (e.g., second and subsequent repeated transmissions) may be transmitted beyond the predetermined period.

[0077] When a predetermined trigger / predetermined condition (e.g., a trigger signal) is triggered by the PRACH and a random access procedure is performed, the PDCCH / DCI for the response signal to the PRACH (e.g., message 2 (Msg2) / RAR) and the PDCCH / DCI for the system information may be transmitted separately.

[0078] The PDSCH (or DL-SCH) used to transmit the RAR may be scheduled by the PDCCH / DCI for RAR / Msg2, and the PDSCH (or DL-SCH) used to transmit the system information may be scheduled by the PDCCH / DCI for system information. Different RNTIs may be applied to the PDCCH / DCI for RAR / Msg2 and the PDCCH / DCI for system information. For example, the RA-RNTI may be applied to the PDCCH / DCI for RAR / Msg2, and the SI-RNTI may be applied to the PDCCH / DCI for system information. Note that applicable RNTIs are not limited to this.

[0079] After transmitting the PRACH used as a trigger signal, the UE may simultaneously monitor / receive the PDCCH / DCI for RAR / Msg2 and the PDCCH / DCI for system information. The time window corresponding to the PDCCH / DCI for RAR / Msg2 and the time window corresponding to the PDCCH / DCI for system information may be provided in common or separately (e.g., differently).

[0080] Alternatively, the PDCCH / DCI for the RAR / Msg2 and the PDCCH / DCI for the system information may be transmitted in common (for example, the same PDCCH / DCI may be applied). In this case, the system information and the RAR / Msg2 may be included in one or more PDSCHs (or DL-SCHs) scheduled by the same PDCCH / DCI.

[0081] The system information transmitted based on the trigger signal transmitted from the UE may be transmitted at a predetermined transmission start timing, which may be at least one of within X symbols / slots / milliseconds, after X symbols / slots / milliseconds, and after X symbols / slots / milliseconds from a predetermined opportunity / predetermined condition (e.g., transmission / reception of the trigger signal).

[0082] The transmission of system information may not be included in the random access procedure. For example, if system information is not required for the random access procedure, the transmission of system information may be transmitted at any time during or after the random access procedure.

[0083] On the other hand, if the system information is required for the random access procedure (for example, if the random access procedure is controlled based on the system information), the system information may be transmitted before the RAR / Msg 2. When the UE transmits the PRACH as a trigger signal, the UE may control the monitoring / reception process on the assumption that the system information (or the PDCCH / DCI for the system information) is transmitted before the RAR / Msg 2 (or the PDCCH / DCI for the RAR / Msg 2).

[0084] [Stopping Transmission of System Information] When a predetermined condition is satisfied after starting transmission of the system information, the base station may stop transmission of the system information (for example, at least one of PDCCH / DCI for system information and PDSCH (or DL-SCH) including the system information). The predetermined condition may be after a predetermined period has elapsed from a certain timing (for example, the timing of starting transmission of the system information or the timing of receiving a trigger signal), or may be reception of a signal / channel transmitted from the UE.

[0085] For example, the specified condition may be at least one of the following: when a specified time has elapsed (or when a specified timer has expired); when the UE transmits a transmission signal (e.g., PRACH or HARQ-ACK) associated with receiving system information and the signal is received by the base station; and when the UE performs a specified UL transmission in the random access procedure (e.g., UL transmission using an UL grant included in message 3 / RAR) and the signal is received by the base station.

[0086] [Notification of configuration information related to system information] Configuration information related to system information (e.g., information related to PDCCH / PDSCH for system information) may be configured / instructed to the UE. The configuration information related to system information may include at least one of a transmission resource, a transmission occasion, and whether or not repeated transmission is configured for the system information (e.g., PDCCH / PDSCH for system information), or may include other parameters.

[0087] <<Using PDCCH>> Configuration information related to system information (e.g., System Information Configuration / System Information Config) may be instructed from the base station to the UE by a predetermined PDCCH / DCI (see FIG. 3). Information related to the predetermined PDCCH (e.g., transmission parameters) configured / instructed from the base station to the UE may be transmitted over the same frequency / carrier / cell / RAT / communication system as the frequency / carrier / cell / RAT over which the system information is transmitted (e.g., Option 1-1 above). Alternatively, information related to the PDCCH configured / instructed from the base station to the UE may be transmitted over a frequency / carrier / cell / RAT / communication system different from the frequency / carrier / cell / RAT over which the system information is transmitted (e.g., Option 1-2 to Option 1-3 above).

[0088] Information related to a predetermined PDCCH (e.g., information related to PDCCH / PDSCH resources for system information) may be configured / instructed to a UE from a base station via a synchronization signal / broadcast channel (e.g., a synchronization signal block (SS / PBCH block)). The base station may transmit the PDCCH after transmitting a synchronization signal block including information related to the predetermined PDCCH.

[0089] A predetermined PDCCH may include information (e.g., trigger signal configuration / trigger signal config) related to a trigger signal (e.g., a PRACH / dedicated signal) in addition to / instead of configuration information related to system information. A predetermined PDCCH may indicate both configuration information related to system information and configuration information related to a trigger signal, or may indicate only configuration information related to a trigger signal. By not including information related to a trigger signal in a synchronization signal block (transmitting it separately from the synchronization signal block), an increase in the size of the synchronization signal block can be suppressed.

[0090] After receiving a synchronization signal block transmitted from a base station, the UE may control monitoring / reception of a predetermined PDCCH / DCI (e.g., a PDCCH / DCI for a trigger signal) based on information included in the synchronization signal block. The UE may also control transmission of the trigger signal based on configuration information related to the trigger signal included in the PDCCH / DCI.

[0091] The base station may transmit a PDCCH / DCI for system information and a PDSCH for system information scheduled by the PDCCH / DCI for system information based on a trigger signal transmitted from the UE. Also, the base station may transmit a PDCCH / DCI for RAR / Msg2 and a PDSCH scheduled by the PDCCH / DCI for RAR / Msg2 based on a trigger signal transmitted from the UE, in addition to or instead of the PDCCH / DCI / PDSCH for system information.

[0092] 3 illustrates a case in which the base station separately transmits a first PDCCH / DCI for system information (e.g., SIB) and a second PDCCH / DCI for RAR / Msg2 based on a trigger signal transmitted from the UE. The base station also separately transmits a first PDSCH for system information (e.g., SIB) scheduled by the first PDCCH / DCI for system information (e.g., SIB) and a second PDSCH for RAR / Msg2 scheduled by the second PDCCH / DCI for RAR / Msg2.

[0093] However, the PDCCH / DCI for system information and the PDCCH / DCI for RAR / Msg2 may be transmitted as one / common PDCCH / DCI (see FIG. 4). In this case, the one / common PDCCH / DCI may schedule a PDSCH including at least one of the system information and the RAR / Msg2.

[0094] If the UE fails to receive a PDCCH / DCI (e.g., a PDCCH / DCI for system information) within a predetermined period or until a predetermined timer expires after transmitting a trigger signal, the UE may determine that transmission of the trigger signal has failed (or that the base station has failed to receive the trigger signal) and may retransmit the trigger signal. In this case, the retransmission may be controlled by changing the transmission parameters of the trigger signal for retransmission. For example, the UE may increase the transmission power and retransmit the trigger signal. The width of the increase step of the transmission power may be defined in the specifications or may be set by the network / base station via RRC parameters, etc.

[0095] If the UE successfully receives a PDCCH / DCI (e.g., a PDCCH / DCI for system information) after transmitting a trigger signal but is unable to receive a PDSCH (e.g., a PDSCH for system information) scheduled by the PDCCH / DCI, the UE may retransmit the trigger signal. In this case, the retransmission may be controlled by changing the transmission parameters of the trigger signal for retransmission. For example, the UE may increase the transmission power and retransmit the trigger signal.

[0096] The PDCCH / DCI for system information may be CRC scrambled with a dedicated RNTI, which may be, for example, an RNTI associated with the RACH transmission, such as an RA-RNTI.

[0097] Alternatively, the PDCCH / DCI for system information may be CRC scrambled using a RNTI (e.g., SI-RNTI) that is common to other PDCCHs / DCIs. In this case, the UE may receive system information triggered by a UE other than the UE itself. When reception of system information triggered by a UE other than the UE itself becomes possible, the UE may monitor / search for the PDCCH / DCI for system information before transmitting a trigger signal. When the UE can receive the PDCCH / DCI for system information, the UE may receive a PDSCH including system information based on the PDCCH / DCI for system information.

[0098] In this way, by enabling a UE to receive the PDCCH / DCI / PDSCH for system information transmitted from a base station based on trigger signals from other UEs, it is possible to reduce the transmission of trigger signals from each UE.

[0099] <<Using a channel other than PDCCH>> Configuration information related to system information may be configured / instructed to a UE from a base station by a synchronization signal block (e.g., an SS / PBCH block). For example, configuration information related to system information (e.g., configuration information of a PDCCH / PDSCH for system information) may be configured in a UE by a synchronization signal block.

[0100] The synchronization signal block may configure the UE with configuration information regarding trigger signals in addition to / instead of configuration information for PDCCH / PDSCH for system information.

[0101] For example, the synchronization signal block may configure a PDSCH (e.g., a PDSCH resource) for system information (e.g., an SIB) and also configure a trigger signal. In this case, the system information (e.g., an SIB) may configure a PDCCH (e.g., a PDCCH for RAR / Msg.2).

[0102] As shown in the first embodiment, it is possible to appropriately control on-demand transmission for a predetermined DL signal / channel (e.g., PDCCH / PDSCH for system information), thereby improving the utilization rate of radio resources and reducing the power consumption of the base station.

[0103] Second Embodiment The second embodiment relates to information about a trigger signal transmitted from a UE (for example, setting information of the trigger signal).

[0104] The UE may receive the trigger signal configuration information using at least one of a synchronization signal / broadcast channel (SS / PBCH) and a PDCCH / DCI. The synchronization signal / broadcast channel (SS / PBCH) and a synchronization signal block (SS / PBCH block) may be interchangeable.

[0105] [SS / PBCH] Configuration information of a trigger signal may be configured / indicated to a UE via SS / PBCH. Based on the configuration information of the trigger signal, the UE may determine transmission parameters / transmission conditions to be applied to the trigger signal (e.g., PRACH or dedicated signal).

[0106] [PDCCH / DCI] Configuration information for a trigger signal may be configured / indicated to a UE by a PDCCH / DCI. In this case, the configuration information for the PDCCH / DCI may be configured / indicated to a UE by an SS / PBCH. The UE controls monitoring / reception processing of the PDCCH / DCI based on the configuration information for the PDCCH / DCI included in the SS / PBCH.

[0107] The PDCCH / DCI may correspond to a PDCCH / DCI for a random access channel (e.g., RACH). A dedicated DCI format may be applied to the PDCCH / DCI, or a DCI format common to other PDCCHs / DCIs may be applied to the PDCCH / DCI. The PDCCH / DCI may be CRC-scrambled using a RNTI common to other PDCCHs / DCIs.

[0108] The configuration information of the trigger signal may be transmitted on the same frequency / carrier / cell / RAT / communication system as the frequency / carrier / cell / RAT on which the system information is transmitted, or alternatively, the configuration information of the trigger signal may be transmitted on a different frequency / carrier / cell / RAT / communication system than the frequency / carrier / cell / RAT on which the system information is transmitted.

[0109] The setting information of the trigger signal may include at least one of information on the format of the transmission signal / RACH format, information on time resources (e.g., transmission timing / transmission pattern), information on frequency resources, the number of frequency division multiplexing (FDM) in the case of FDM in the frequency direction, information on transmission power, and information on association with the synchronization signal block index.

[0110] The information on time resources may be used to set the transmission resource of the trigger signal based on absolute time resources (e.g., SFN). Alternatively, the information on time resources may be used to set relative time resources (e.g., timing after a predetermined slot / symbol from the slot / symbol at which the DCI is received). The information on time resources may also indicate the setting of time division multiplexing (TDM) in addition to the time resources.

[0111] Third Embodiment The third embodiment relates to a trigger signal transmitted from a UE.

[0112] A configuration may be supported in which a trigger signal (e.g., a PRACH / dedicated signal) is transmitted multiplexed / overlapped with other signals / channels in at least one of the frequency domain, the time domain, and the code domain.

[0113] The trigger signal may be transmitted based on at least one of the following options 3-1 to 3-3.

[0114] [Option 3-1] The trigger signal may be frequency division multiplexed (FDM) with a synchronization signal block (e.g., SSB) (see FIG. 5). The UE may transmit the trigger signal using resources multiplexed in the frequency domain with the synchronization signal block. FIG. 5 shows an example in which the trigger signal (here, PRACH #b) transmitted from the UE is FDM-multiplexed with the synchronization signal block. The positions of each signal in FIG. 5 are merely examples and are not limited to these.

[0115] The time position of the trigger signal (e.g., the time resource of the trigger signal) may be determined by a time offset based on the synchronization signal block. Information regarding the time offset may be configured / instructed from the base station to the UE. Configuration information for the trigger signal including information regarding the time offset may be included in the synchronization signal block, or may be included in another DL signal / channel (e.g., a signal / channel transmitted from another cell / RAT). For example, information regarding symbols (e.g., 0 to 2 symbols) may be configured / instructed to the UE as the time offset.

[0116] Alternatively, the time position of the trigger signal may be the same as that of the synchronization signal block, in which case it is not necessary to set / indicate information regarding the time position of the trigger signal.

[0117] The frequency location of the trigger signal (e.g., the frequency resource of the trigger signal) may be determined by a frequency offset relative to the synchronization signal block. Information regarding the frequency offset may be configured / instructed to the UE from the base station. Configuration information for the trigger signal, including information regarding the frequency offset, may be included in the synchronization signal block or may be included in another DL signal / channel (e.g., a signal / channel transmitted from another cell / RAT).

[0118] As the frequency offset, for example, a subcarrier / PRB / RBG may be set / instructed to the UE. A frequency position at which a trigger signal can be set may be defined in a specification, or may be set / instructed to the UE.

[0119] By FDM-splitting the trigger signal and synchronization signal blocks, beam search can be performed simultaneously in the UL and DL, thereby reducing the time resources required for beam search.

[0120] [Option 3-2] The trigger signal may be time division multiplexed (TDM) with the synchronization signal block. The UE may transmit the trigger signal using resources multiplexed in the time domain with the synchronization signal block. Figure 5 shows an example in which the trigger signal (here, PRACH#a) transmitted from the UE is TDMed with the synchronization signal block. The positions of each signal in Figure 5 are merely examples and are not limited to these.

[0121] The time position of the trigger signal (e.g., the time resource of the trigger signal) may be determined by a time offset based on the synchronization signal block. Information regarding the time offset may be configured / instructed from the base station to the UE. Configuration information for the trigger signal including information regarding the time offset may be included in the synchronization signal block, or may be included in another DL signal / channel (e.g., a signal / channel transmitted from another cell / RAT). For example, information regarding symbols / slots (e.g., 0 to 2 symbols / slots) may be configured / instructed to the UE as the time offset. Alternatively, the time position of the trigger signal may be notified as an absolute value by the SFN.

[0122] The frequency position of the trigger signal (e.g., frequency resource of the trigger signal) may be determined by a frequency offset based on the synchronization signal block. Information regarding the frequency offset may be configured / instructed to the UE by the base station. Configuration information for the trigger signal including information regarding the frequency offset may be included in the synchronization signal block, or may be included in another DL signal / channel (e.g., a signal / channel transmitted from another cell / RAT). For example, a subcarrier / PRB / RBG may be configured / instructed to the UE as the frequency offset.

[0123] Alternatively, the frequency position of the trigger signal may be the same as that of the synchronization signal block, in which case it is not necessary to set / indicate information regarding the frequency position of the trigger signal.

[0124] [Option 3-3] The trigger signal may be time-division multiplexed (TDM) and frequency-division multiplexed (FDM) with the synchronization signal block. The UE may transmit the trigger signal using resources multiplexed with the synchronization signal block in the time domain and the frequency domain. Figure 5 shows an example in which the trigger signal (here, PRACH #c) transmitted from the UE is TDM and FDM with the synchronization signal block. The positions of each signal in Figure 5 are merely examples and are not limited to these.

[0125] The time position (for example, the time resource of the trigger signal) / frequency position (for example, the frequency resource of the trigger signal) of the trigger signal may be any of the configurations shown in Option 3-1 / Option 3-2.

[0126] As a trigger signal setting, multiple settings (for example, PRACH#a (option 3-1) and PRACH#b (option 3-2)) may be applied / supported simultaneously.

[0127] In Option 3-1 to Option 3-3, the trigger signal and the synchronization signal block are FDM / TDM-based, but this is not limiting. Option 3-1 to Option 3-3 may also be applied to the case where the trigger signal and other signals / channels (e.g., PDCCH) are FDM / TDM-based.

[0128] In Option 3-1 to Option 3-3, the frequency resources for transmitting predetermined signals / channels (e.g., synchronization signal block / PDCCH / RAR PDCCH / SIB1 PDSCH) may be narrowed (or limited). In this way, by restricting the degree of freedom in the frequency direction for transmitting predetermined signals / channels, it becomes possible to apply this to the initial access of UEs with limited available frequency resources, such as IoT terminals.

[0129] As shown in the third embodiment, by setting the trigger signal in relation to other signals / channels (for example, synchronization signal blocks), it is possible to reduce the amount of information required for setting the trigger signal, thereby suppressing an increase in the overhead of the trigger information transmitted from the base station.

[0130] Fourth Embodiment The fourth embodiment relates to an example of UE operation / base station operation after a trigger signal is transmitted.

[0131] The UE may transmit a trigger signal (e.g., PRACH / dedicated signal) to trigger / request system information from the network (e.g., base station). After transmitting the trigger signal, the UE may perform at least one of the following operations: Option 4-1 to Option 4-3.

[0132] [Option 4-1] After transmitting the trigger signal, the UE may receive system information (for example, SIB) and transmit the PRACH using resources configured by the SIB (see FIG. 6).

[0133] For example, the UE may transmit a signal / channel other than the PRACH (e.g., a dedicated signal) as a trigger signal, receive system information transmitted from the base station based on the trigger signal, and transmit the PRACH based on PRACH configuration information included in the system information. Option 4-1 may be suitably applied when the UE transmits a signal / channel other than the PRACH (e.g., a dedicated signal) as a trigger signal.

[0134] The time / frequency resources of the trigger signal (e.g., PRACH / dedicated signal) used to trigger system information and the time / frequency resources of the PRACH for initiating the random access procedure may be configured separately.

[0135] Of course, the present invention is not limited to this, and may be applied to a case where a PRACH is transmitted as a trigger signal. In this case, the UE transmits a first PRACH for the trigger signal and receives system information transmitted based on the first PRACH. The UE may transmit a second PRACH (e.g., a PRACH for a random access procedure) based on configuration information for a second PRACH included in the system information.

[0136] [Option 4-2] After transmitting the trigger signal, the UE may receive system information (eg, SIB) and RAR / Message 2.

[0137] For example, the UE may transmit a PRACH as a trigger signal (or may regard a trigger signal of system information as a PRACH transmission), and receive system information and RAR / Message 2 transmitted from the base station based on the trigger signal (see FIG. 7). Option 4-2 may be suitably applied when the UE transmits a PRACH as a trigger signal. Of course, this is not limiting, and it may also be applied when a dedicated signal is transmitted as a trigger signal.

[0138] When the base station receives a trigger signal transmitted from the UE, the base station may transmit system information (e.g., PDCCH / PDSCH for system information) first, and then transmit RAR / Message 2 (e.g., PDCCH / PDSCH for RAR / Message 2). After transmitting the trigger signal, the UE may monitor / receive system information (e.g., SIB) in the time domain before RAR / Message 2. In this case, the time window for monitoring the PDCCH / DCI for system information and the time window for monitoring the PDCCH / DCI for RAR / Message 2 may be configured separately or commonly.

[0139] Alternatively, when the base station receives a trigger signal transmitted from the UE, it may transmit the RAR / Message 2 (e.g., the PDCCH / PDSCH for the RAR / Message 2) first, and then transmit the system information (e.g., the PDCCH / PDSCH for the system information). After transmitting the trigger signal, the UE may receive the RAR / Message 2 before the system information (e.g., the SIB) in the time domain. In this case, the time window for monitoring the PDCCH / DCI for the system information and the time window for monitoring the PDCCH / DCI for the RAR / Message 2 may be set separately or commonly.

[0140] The UE may retransmit the trigger signal if it fails to receive system information (e.g., PDCCH / PDSCH for system information).

[0141] If the UE fails to receive the system information but successfully receives the RAR / Message 2, the UE may perform UL transmission (e.g., transmission of Message 3) based on the RAR / Message 2. When the UE performs UL transmission (e.g., transmission of Message 3) based on the RAR / Message 2, the UE may include a HARQ-ACK for the system information or a report on the reception status of the system information in the UL transmission (e.g., Message 3).

[0142] For example, if the UE fails to receive the system information but successfully receives RAR / Message 2, it may request a retransmission of the system information using an UL transmission (e.g., transmission of Message 3) based on RAR / Message 2. In this case, the UE may attempt to receive the system information simultaneously with (or before / after receiving) a DL transmission (e.g., Message 4) sent from the base station after the UL transmission (e.g., Message 3).

[0143] [Option 4-3] After transmitting the trigger signal, the UE may receive the RAR / Message 2. In this case, the UE may be controlled to complete the random access procedure without using system information.

[0144] For example, after transmitting the trigger signal, the UE may receive RAR / Message 2 without receiving system information, and perform UL transmission based on the RAR / Message 2 (e.g., transmission of Message 3) (see FIG. 8). The PDSCH transmitted in RAR / Message 2 may include information related to UL transmission based on the RAR / Message 2 (e.g., transmission of Message 3). The information related to UL transmission (e.g., transmission of Message 3) may include at least one of scheduling information and configuration information other than scheduling information.

[0145] The UE may receive a DL transmission (e.g., message 4) transmitted from the base station after transmitting the UL transmission (e.g., message 3). In this case, the UE may receive system information (e.g., SIB) together with receiving the DL transmission (e.g., message 4) (see FIG. 8). The base station may control the transmission of system information after receiving the UL transmission (e.g., message 3) from the terminal.

[0146] Alternatively, the UE may transmit a HARQ-ACK for a DL transmission (e.g., message 4) transmitted from the base station after the transmission of the UL transmission (e.g., message 3). In this case, the UE may be controlled to receive system information after transmitting a HARQ-ACK for the DL transmission (e.g., message 4). The base station may be controlled to transmit system information after receiving a HARQ-ACK (e.g., ACK) from the terminal in response to message 4.

[0147] The options 4-1 to 4-3 may be used selectively based on a predetermined condition, which may be at least one of cell / CC configuration and UE capability.

[0148] For example, a UE that only supports narrowband (e.g., an IoT terminal) may apply the UE behavior of Option 4-3. In this case, the UE may report information about its capabilities using UL transmission based on the RAR / Message 2 (e.g., transmission of Message 3).

[0149] Other UEs (e.g., UEs that support more than narrowband) may apply the UE operation of Option 4-1 / Option 4-2, in which case, for example, the UE may receive system information at a frequency different from that of the synchronization signal block / trigger signal.

[0150] <Supplementary Information> <<Notification of Information to UE>> In the above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0151] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0152] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0153] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0154] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0155] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0156] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0157] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0158] <<Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-described embodiments may be applied (used) when one or more of the following conditions are met: - A higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured. - The specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters. - The specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS. - A specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported. - The application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0159] The particular UE capability may indicate that the particular process / action / control / assumption / information is supported.

[0160] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of UE, cell, band, band combination, BWP, component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0161] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0162] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0163] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiving unit that receives at least one of configuration information related to a trigger signal and configuration information related to system information, the configuration information being included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block; a transmitting unit that transmits a trigger signal based on the configuration information related to the trigger signal; and a control unit that controls reception of the system information transmitted in response to the trigger signal. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the control unit controls to monitor a downlink control channel used for scheduling a downlink shared channel in which the system information is included, during a time window after transmitting the trigger signal. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein at least one of frequency division multiplexing and time division multiplexing is applied to the synchronization signal block and the trigger signal. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the control unit controls to receive at least one of system information and a response signal transmitted in response to the random access channel after transmitting a random access channel as the trigger signal.

[0164] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0165] 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0166] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0167] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0168] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0169] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The location, number, shape, size, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as the base station 10.

[0170] The wireless communication system 1 may utilize multi-input multi-output (MIMO). For example, one cell may be formed by one antenna / base station 10, or may be formed by multiple antennas / base stations 10. One [virtual] cell (which may be called, for example, a supercell) may be composed of multiple [virtual] cells (which may be called, for example, subcells). A supercell may correspond to a cell with a fixed physical range, and a subcell may correspond to a cell with a quasi-static / dynamically variable physical range. In this case, the wireless communication system 1 may be called a cell-free system.

[0171] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0172] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0173] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0174] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 / Xn interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0175] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0176] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0177] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0178] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0179] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0180] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0181] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0182] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0183] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0184] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0185] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0186] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0187] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0188] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0189] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0190] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0191] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0192] (Base Station) Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0193] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0194] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0195] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0196] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0197] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0198] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0199] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0200] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0201] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0202] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0203] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0204] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0205] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0206] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0207] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0208] The transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter / receiver 120, the transmitter / receiver antenna 130, and the transmission path interface 140.

[0209] The base station 10 may be separated into three elements: a radio unit (RU), a distributed unit (DU), and a central unit (CU). For example, the RU may implement RF processing (digital beamforming, digital-to-analog conversion, analog beamforming, etc.) and lower-level functions of the physical layer (precoding, IFFT, FFT, etc.). The DU may implement higher-level functions of the physical layer (coding to resource element mapping, etc.), MAC layer functions, and RLC layer functions. The CU may implement the functions of the PDCP layer, Service Data Adaptation Protocol (SDAP) layer, and RRC layer.

[0210] In the present disclosure, the base station 10 may include a single device that realizes all of the functions of the RU, DU, and CU, or may include multiple devices that each realize some of the functions of the RU, DU, and CU and are connected to each other. In the present disclosure, the base station 10 may be interchangeably read as RU / DU / CU.

[0211] The transmitting / receiving unit 120 may transmit at least one of setting information regarding a trigger signal and setting information regarding system information, which are included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block. The transmitting / receiving unit 120 may receive a trigger signal transmitted from a terminal.

[0212] The control unit 110 may control the transmission of the system information in response to the trigger signal.

[0213] (User Terminal) Fig. 11 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0214] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0215] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0216] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0217] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0218] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0219] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0220] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0221] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0222] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0223] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0224] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0225] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0226] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0227] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0228] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0229] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0230] Note that the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0231] The transceiver 220 may receive at least one of setting information related to a trigger signal and setting information related to system information, which are included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block. The transceiver 220 may transmit the trigger signal based on the setting information related to the trigger signal.

[0232] The controller 210 may control reception of system information transmitted in response to the trigger signal. The controller 210 may control to monitor a downlink control channel used for scheduling a downlink shared channel including the system information during a certain time window after transmitting the trigger signal. The controller 210 may control transmission of the trigger signal such that at least one of frequency division multiplexing and time division multiplexing is applied to the synchronization signal block and the trigger signal. After transmitting a random access channel as the trigger signal, the controller 210 may control to receive at least one of system information and a response signal transmitted in response to the random access channel.

[0233] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0234] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0235] For example, a base station, a user terminal, or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0236] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0237] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0238] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0239] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0240] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0241] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0242] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0243] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0244] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0245] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0246] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0247] In addition, the devices included in the core network 30 (for example, network nodes that provide NF) may also be realized by the above-mentioned functional block / hardware configuration.

[0248] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0249] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0250] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0251] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0252] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0253] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0254] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0255] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0256] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0257] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0258] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0259] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0260] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0261] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0262] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0263] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0264] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0265] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0266] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0267] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0268] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0269] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0270] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0271] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0272] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0273] With respect to any information (e.g., variables, constants, parameters) described in the present disclosure, even if not specifically stated in the above embodiments, any first device (e.g., UE / base station) may notify any second device (e.g., base station / UE) of information indicating / specifying (or relating to) the value of the any information.

[0274] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0275] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0276] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0277] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0278] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0279] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0280] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0281] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0282] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0283] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0284] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0285] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0286] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0287] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0288] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0289] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0290] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0291] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0292] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0293] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0294] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0295] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0296] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0297] 13 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0298] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0299] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0300] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0301] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0302] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0303] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0304] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0305] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0306] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0307] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0308] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0309] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0310] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0311] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0312] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0313] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0314] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0315] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0316] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0317] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0318] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0319] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0320] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ..." or "do ... (if the above "..." is a to-infinitive, a verb with "to")," etc. "does not expect ..." may be interchangeably read as "be not expected ..." or "does not ... (if the above "..." is a to-infinitive, a verb with "to")," etc. Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (for example, if apparatus A is a UE, apparatus B may be a base station).

[0321] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0322] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0323] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0324] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0325] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0326] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0327] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0328] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0329] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0330] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0331] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal having a receiving unit that receives at least one of setting information regarding a trigger signal and setting information regarding system information included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block; a transmitting unit that transmits a trigger signal based on the setting information regarding the trigger signal; and a control unit that controls the reception of the system information transmitted in response to the trigger signal.

2. The terminal according to claim 1, wherein the control unit controls to monitor a downlink control channel used for scheduling a downlink shared channel containing the system information during a certain time window after transmitting the trigger signal.

3. The terminal according to claim 1, wherein at least one of frequency division multiplexing and time division multiplexing is applied to the synchronization signal block and the trigger signal.

4. The terminal according to claim 1, wherein the control unit controls the terminal to receive at least one of system information and a response signal transmitted in response to the random access channel after transmitting the random access channel as the trigger signal.

5. A wireless communication method for a terminal, comprising the steps of: receiving at least one of configuration information regarding a trigger signal and configuration information regarding system information contained in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block; transmitting a trigger signal based on the configuration information regarding the trigger signal; and controlling the reception of system information transmitted in response to the trigger signal.

6. A base station having: a transmitting unit that transmits at least one of setting information regarding a trigger signal and setting information regarding system information to a terminal, the setting information being included in at least one of a synchronization signal block and a downlink control channel in which at least one of a monitoring opportunity and a resource is indicated by the synchronization signal block; a receiving unit that receives the trigger signal transmitted from the terminal; and a control unit that controls the transmission of system information in response to the trigger signal.

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