Terminal, radio communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a receiving unit that receives a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells; and a control unit that controls acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells on the basis of at least one of the synchronization signal and the physical broadcast channel. According to one aspect of the present disclosure, communication can be performed appropriately using a plurality of frequency carriers / cells.

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, it is being considered that a terminal (user terminal, User Equipment (UE)) will perform an initial access procedure to multiple frequency carriers / cells / component carriers.

[0006] However, the method of such an initial access procedure has not been sufficiently considered, and if this consideration is insufficient, there is a risk that the initial access procedure will not be carried out properly.

[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 communicate using multiple frequency carriers / cells.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells, and a control unit that controls the acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells based on at least one of the synchronization signal and the physical broadcast channel.

[0009] According to one aspect of the present disclosure, communication can be performed appropriately using multiple frequency carriers / cells.

[0010] 1A and 1B are diagrams illustrating an overview of MIMO. FIG. 2A is a diagram illustrating an overview of a cellular system. FIG. 2B is a diagram illustrating an overview of a cell-free system. FIG. 3A is a diagram illustrating an example of an overview of Assumption 1 of a cell-free configuration. FIG. 3B is a diagram illustrating an example of an overview of Assumption 2 of a cell-free configuration. FIG. 3C is a diagram illustrating another example of an overview of Assumption 2 of a cell-free configuration. FIG. 4 is a diagram illustrating an example of reception of a synchronization signal / PBCH according to embodiment 1-1. FIG. 5 is a diagram illustrating an example of an arrangement of base stations using first and second frequencies. FIG. 6 is a diagram illustrating another example of an arrangement of base stations using first and second frequencies. FIG. 7 is a diagram illustrating an example of reception of a synchronization signal / PBCH according to embodiment 1-2. FIG. 8 is a diagram illustrating an example of reception of a synchronization signal / PBCH according to embodiment 1-3. 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 a hardware configuration 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 5G NR initial access procedure, the UE (RRC_IDLE mode) receives the SS / PBCH block (SSB), 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). After that, when an ACK for Msg. 4 is transmitted from the UE by the base station (network), an RRC connection is established (RRC_CONNECTED mode).

[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.

[0016] The PDSCH carrying SIB1 (SIB1 PDSCH) is transmitted periodically. The PDSCH is scheduled by Type 0-PDCCH. One SSB corresponds to one SIB1 PDSCH. One SIB1 PDSCH may or may not be repeated twice. SIB1 sets the public land mobile network (PLMN) ID. The PLMN ID may also be called the Mobile Network Operator (MNO) identifier.

[0017] The PLMN ID is a globally unique identifier used to identify an MNO.

[0018] The UE identifies the MNO to perform the network access operation based on specific parameters in the system information (e.g., SIB1) (e.g., PLMN identity information list (e.g., PLMN-IdentityInfoList) in the cell access related information (e.g., CellAccessRelatedInfo)).

[0019] 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. A UE that detects an SSB transmits a PRACH in the RACH occasion associated with that SSB index and receives an RAR in the RAR window.

[0020] (Cell-free) Existing wireless communication systems (e.g., 5G NR) have adopted a cellular system in which one cell is formed by one antenna / transmitting / receiving point (TRP). The area formed by the cell is a fixed / static area.

[0021] In addition, existing wireless communication systems (e.g., Rel. 16 and later) have introduced distributed multi-input multi-output (Distributed MIMO, e.g., multi-TRP using multiple TRPs), which forms a communication area using the coverage of multiple antennas / TRPs. Distributed MIMO allows simultaneous communication using multiple antennas / TRPs and communication using one antenna / TRP.

[0022] By adopting distributed MIMO, it is possible to create a more favorable line-of-sight environment and improve MIMO performance.

[0023] 1A and 1B are diagrams illustrating an overview of MIMO. Fig. 1A illustrates an example of co-located MIMO. In co-located MIMO, one UE communicates with one antenna / TRP.

[0024] On the other hand, Figure 1B illustrates an example of distributed MIMO, in which one UE communicates with multiple antennas / TRPs in cooperation with each other.

[0025] In future wireless communication systems (e.g., Rel. 20 and later), the introduction of cell-free communication is being considered with the aim of further improving performance and energy efficiency through reducing interference between multiple antennas / TRPs, creating a line-of-sight environment for high-frequency use, improving frequency utilization efficiency throughout the system, and applying equal, high-quality communication to each user.

[0026] Self-Free may also be referred to as cell-free massive MIMO (mMIMO) or large-scale distributed MIMO (D-MIMO). Self-Free uses coherent cooperation of multiple access points. Self-Free may include at least one of ultra-dense deployment, scalable cooperation, user-centric clustering, super-carrier aggregation, and analog fronthaul. The user plane for cell-free may perform more flexible scheduling than existing scheduling. The control plane for cell-free may retain some form of cell to facilitate signaling.

[0027] In cell-free, unlike conventional cellular systems, one area (which may be called a cell / sub-cell, etc.) may be formed by multiple antennas / TRPs. In other words, the area may mean a cell that is independent of the location of the antenna / TRP.

[0028] In cell-free, the set of antennas / TRPs used to form a coverage area may be changed according to the needs of UEs. For example, the set of antennas / TRPs may be changed based on the number of UEs, the number of traffic, communication purposes (e.g., initial access, data communication, measurement, reporting, etc.), etc., rather than the coverage of the antennas / TRPs.

[0029] In other words, in cell-free, the coverage between multiple antennas / TRPs may overlap.

[0030] In cell-free mode, the direction in which a synchronization signal (which may also be called, for example, a synchronization signal block (SSB), a synchronization signal / physical broadcast channel (SS / PBCH) block, etc.) is transmitted may be controlled for each antenna / TRP.

[0031] In addition, in cell-free, a central unit (CU) / distributed unit (DU) may be virtualized for each antenna, or each antenna may be managed by only the CU.

[0032] Fig. 2A is a diagram showing an overview of a cellular system, in which cells formed by each antenna / TRP are shown, and UEs communicate based on these cells.

[0033] On the other hand, Figure 2B is a diagram showing an overview of a cell-free system. In the example shown in Figure 2B, the installed antennas / TRPs do not form fixed / static cells in a cellular system. As shown in Figure 2B, in a cell-free system, one or more antennas / TRPs form areas according to conditions. Therefore, in a cell-free system, each antenna / TRP does not need to correspond to the same physical cell ID, and the areas between multiple antennas / TRPs may overlap.

[0034] Self-regulation may be achieved, for example, by coordinating a set of antennas / TRPs controlled by a central control unit (e.g., CU).

[0035] In a cell-free system, a first cell (which may be called, for example, a cell / super cell / macro cell / large cell, etc.) with a fixed physical range like a cell in a 5G NR system, and a second cell (which may be called, for example, a subcell / area / micro cell / cell / small cell / second cell within the first cell, etc.) with a quasi-static / dynamic physical range that varies based on conditions may be formed.

[0036] For example, a first cell may be referred to as a supercell to distinguish it from a second cell. When a supercell is composed of multiple second cells, the second cells may have the same definition / operation / coverage as existing cells in NR. For example, a second cell may be referred to as a subcell to distinguish it from a first cell. When a supercell or a cell is composed of multiple subcells, the subcells may have the same definition / operation / coverage as existing cells in NR.

[0037] The first cell may be a cell that is newly defined in a future wireless communication system, or may be a cell defined in an existing wireless communication system that is reused.

[0038] The configurations of the first cell and the second cell can be considered under the following assumptions 1 and 2: Assumption 1: The first cell is composed of multiple TRPs with a single cell ID (physical cell ID (PCI)). The multiple TRPs can transmit and receive in coordination. Assumption 2: The first cell is composed of multiple TRPs (or sub-cells) with different cell IDs. The multiple TRPs / sub-cells can transmit and receive in coordination.

[0039] 3A is a diagram showing an example of the outline of the cell-free configuration assumption 1. In the example shown in FIG. 3A, each TRP included in the first cell (super cell / cell) has the same PCI (PCI #0). Multiple TRPs can communicate with one UE in a coordinated manner.

[0040] Figure 3B is a diagram showing an example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 3B, each TRP included in the first cell (super cell / cell) has a different PCI (PCI #0 to #9). Multiple TRPs can communicate cooperatively with one UE.

[0041] Figure 3C is a diagram showing another example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 3C, a PCI is assigned to each TRP included in the first cell (supercell / cell). In the example shown in Figure 3C, unlike the example in Figure 3B, the same PCI may correspond to multiple TRPs. Multiple TRPs can communicate cooperatively with one UE.

[0042] Transmission / reception with TRP / subcell coordination may be based on at least one of the following schemes supported in NR: - Transmission of a single TRP / subcell with dynamic TRP / subcell switching (single-TRP transmission). - Joint transmission using multiple TRPs / subcells (multi-TRP joint transmission). The joint transmission may be based on a single DCI or multiple DCIs. The joint transmission may be non-coherent joint transmission (NCJT) or coherent joint transmission (CJT).

[0043] For cell-free, assuming ideal backhaul and tight coordination, in the joint transmission scheme, CJT may be prioritized over NCJT, and single DCI-based joint transmission may be prioritized over multi-DCI-based joint transmission.

[0044] Selfly can realize large-scale distributed MIMO, low layer (e.g., L2 / L1) mobility, and flexible TRP clustering. For example, when applied to ultra-high density TRP, cell / TRP clustering for mobility / control and data can be separated.

[0045] The cell-free approach has the following features: - It can increase the TRP deployment density per cell, thereby improving the signal-to-noise ratio (SNR) for all UEs, including those in conventional cell edge areas. - It can realize flexible (e.g., UE-centric) TRP clustering for cell construction, thereby reducing the number of UEs affected by inter-cell / inter-TRP interference. - It can realize mobility at lower layers. Since more TRPs can be considered in one clustering, seamless mobility can be achieved, for example, by operating at the L1 level.

[0046] For selfies, the following concepts 1 or 2 may be applied.

[0047] <Concept 1> Selfry selects multiple TRPs / access points (APs), and transmission / reception with the TRPs / APs targets only data (e.g., PDSCH / PUSCH) (e.g., at the physical / MAC layer). In this case, cell selection, initial access, and mobility are not significantly affected compared to existing methods. LTM (L1L2-triggered mobility, e.g., LTM before Rel. 18) may be reused, or enhanced LTM functionality may be implemented. L1 measurement / reporting or extended SRS transmission for multiple TRPs / APs selection, CSI measurement / reporting or extended SRS transmission for CSI of TRPs / APs in different clusters, etc. may be implemented.

[0048] Concept 2: Selection of multiple TRPs / APs and transmission / reception with TRPs / APs covers both control channels / signals (e.g., in RRC) and data (e.g., PDSCH / PUSCH) (e.g., in the physical / MAC layer).

[0049] In this case, compared to existing methods, there are impacts on cell selection, initial access, and mobility in addition to the measurement / reporting of data L1 / CSI in Concept 1. For example, since a UE needs to access multiple TRPs / APs during initial access, SSB / SI / RACH also need to be redesigned.

[0050] When clustering multiple TRPs / APs for control channels / signaling and data, the clustering method (e.g., TRPs / APs in a cluster) may be the same or different, which may have potential impacts when clustering multiple DUs / CUs that are not in the same geographical location.

[0051] <CCs of Different Frequencies (Carrier Aggregation (CA) Scenario)> Selfry may be applied to CCs of different frequencies (CA scenario). The above multiple TRPs / APs may be processed individually for each CC or jointly across multiple CCs. For example, clustering and scheduling may take into account both the TRP dimension and the CC dimension.

[0052] (Analysis) In existing wireless communication systems (for example, up to Rel. 18), even when data is transmitted and received using multiple frequency carriers / cells / component carriers (CCs) due to carrier aggregation or the like, the UE establishes a connection to each cell independently.

[0053] On the other hand, in future wireless communication systems (for example, Rel. 21 and later), simultaneous (or parallel) initial access to multiple frequency carriers / cells / CCs is being considered.

[0054] Furthermore, when initial access is performed simultaneously (or in parallel) for multiple frequency carriers / cells / CCs, it is conceivable that synchronization signals (e.g., SSBs), control information (e.g., PDCCHs), and system information (e.g., SIB1 (SIB1 PDSCH)) that transmit information necessary for the UE's first transmission (e.g., transmission of a first message / PRACH) may also be directed to multiple frequency carriers / cells / CCs.

[0055] However, specific methods for such initial access procedures have not been sufficiently considered, and if such consideration is insufficient, an appropriate initial access procedure for multiple frequency carriers / cells / CCs cannot be performed, and there is a risk that connection establishment using fewer procedures or procedures with low latency cannot be realized.

[0056] Therefore, the present inventors have conceived a method for solving this problem. According to one aspect of the present disclosure, communication can be performed using a wide range or multiple carriers / cells / bands required for communication, with fewer procedures or low latency procedures in the UE.

[0057] 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.

[0058] (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.

[0059] 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."

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0065] In the present disclosure, the terms carrier, band, cell, frequency, etc. may be read interchangeably.

[0066] 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.

[0067] In the present disclosure, Msg. 1, PRACH, random access preamble, preamble, signal related to the first procedure, procedure 1, first message, etc. may be read interchangeably.

[0068] In the present disclosure, Msg. 2, a PDCCH associated with the RAR, an RAR, a PDSCH including the RAR, a response to Msg. 1, a signal related to the second procedure, procedure 2, a second message, etc. may be read interchangeably.

[0069] In the present disclosure, Msg. 3, PUSCH scheduled by an RAR UL grant, a response to Msg. 2, a signal related to the third procedure, procedure 3, a third message, etc. may be read interchangeably.

[0070] In the present disclosure, Msg. 4, Msg. 4 PDCCH, PDSCH including UE contention resolution identity, response to Msg. 3, signal related to the fourth procedure, procedure 4, fourth message, etc. may be read interchangeably.

[0071] 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.

[0072] In the present disclosure, synchronization signals, synchronization signal blocks (SSB), physical broadcast channels (PBCH), synchronization signal / physical broadcast channel (SS / PBCH) blocks, etc. may be read interchangeably.

[0073] In the present disclosure, the terms frequency, frequency carrier, cell, serving cell, component carrier (CC), carrier, band, bandwidth portion (BWP), etc. may be read interchangeably.

[0074] (Wireless Communication Method) A UE may perform initial access procedures for multiple carriers / bands (simultaneously / in parallel).

[0075] The initial access procedure in the UE may include the following steps 1 to 4: Step 1: Transmitting a first message (e.g., PRACH) to any [plurality] of carriers / bands. Step 2: Receiving a second message (e.g., RAR reception (monitoring PDCCH / search space / CORESET associated with RAR)) from any [plurality] of carriers / bands. Step 3: Transmitting a third message (e.g., Msg. 3) to any [plurality] of carriers / bands. Step 4: Receiving a fourth message (e.g., Msg. 4) from any [plurality] of carriers / bands.

[0076] Note that at least two of the above procedures 1 to 4 may be combined into one procedure. For example, the UE may perform a procedure that combines procedures 2 and 4 after performing one procedure that combines procedures 1 and 3 (this procedure may be called a two-step initial access procedure).

[0077] Furthermore, the names of procedures in this disclosure are merely examples and are merely described for convenience.

[0078] For an initial access procedure for multiple carriers / bands, at least one of the transmission and reception of signals defined as the initial access procedure may be performed for multiple carriers / bands.

[0079] For example, the UE may perform at least some of the procedures (e.g., procedures after a specific procedure, procedures before a specific procedure, or only a specific procedure) for multiple carriers / bands.

[0080] The UE may perform at least one of the above procedures 1 to 4 (which may also be called procedure X) if and only if certain conditions (e.g., conditions for performing an initial access procedure for any carriers / bands) are met.

[0081] In the following, in each embodiment of the present disclosure, an operation before the initial access procedure is performed will be described.

[0082] First Embodiment The first embodiment relates to a synchronization signal / PBCH (for example, SSB, SS / PBCH block).

[0083] In the case of initial access to multiple frequencies, the UE may assume that the synchronization signal / PBCH (for initial access to multiple frequencies) is transmitted from one cell only.

[0084] The UE may be configured with the plurality of frequencies (combinations) in advance.

[0085] For example, the UE may be pre-configured with one carrier that includes the multiple frequencies.

[0086] The UE may also receive information about multiple frequencies (combinations) using higher layer signaling (e.g., system information (e.g., SIB1) / PBCH).

[0087] The UE may control / perform acquisition / estimation / derivation / correction of at least one of time synchronization, frequency synchronization, cell information, and settings related to the first message between multiple frequencies based on the synchronization signal / PBCH.

[0088] In the present disclosure, the synchronization signal / PBCH may be a synchronization signal / PBCH for initial access to a plurality of frequencies, or may be a synchronization signal / PBCH for initial access to a single frequency.

[0089] <<Embodiment 1-1>> The synchronization signal / PBCH may be transmitted from one cell.

[0090] Hereinafter, among the multiple frequencies, the frequency at which the synchronization signal / PBCH is transmitted may be referred to as the first frequency (or F1), and the frequency at which the synchronization signal / PBCH is not transmitted may be referred to as the second frequency (or F2).

[0091] It should be noted that, among the multiple frequencies, there may be one or more F1s, and there may be one or more F2s.

[0092] 4 is a diagram illustrating an example of reception of a synchronization signal / PBCH according to embodiment 1-1. In the example illustrated in FIG. 4, a UE receives a synchronization signal / PBCH in F#1 and does not receive a synchronization signal / PBCH in F#2.

[0093] <<<Time Synchronization>>> The UE may determine the timing on the first frequency as a reference for time synchronization.

[0094] The UE may assume / determine that the first frequency (or the base station) and the second frequency (or the base station) are identical in terms of time synchronization, i.e., the UE may assume / determine that the second frequency matches the time synchronization of the first frequency.

[0095] Such a configuration is suitable, for example, when the base stations of the first and second frequencies (e.g., base station #1 and base station #2) are located / installed in the same location (or in a location considered to be the same) (e.g., the example shown in Figure 5).

[0096] Furthermore, the UE may assume / determine that there is a difference between the first frequency (base station) and the second frequency (base station) in terms of time synchronization. Such a configuration is suitable, for example, when the base stations of the first and second frequencies are located / installed in different locations (or locations considered to be different) (for example, the example shown in FIG. 6 ).

[0097] In this case, the UE may receive information about the difference from the network (NW, for example, a base station) (for example, using the PBCH).

[0098] In this case, the UE may also estimate information about the difference (for example, the difference value).

[0099] For example, the UE may estimate / derive the difference value based on at least one of the difference between the frequencies of F1 and F2 and location information of each base station and the UE.

[0100] In this case, the UE does not need to correct the difference in time synchronization between the first frequency and the second frequency. In this case, the UE may perform time synchronization (correction of time synchronization) with the second frequency (base station) based on the reception (timing) of the DL channel / signal after receiving the synchronization signal / PBCH.

[0101] 5 and 6 show cases where F2 is entirely included in F1, but these are merely examples. For example, F2 may not be included in F1, or part of F2 may be included in F1.

[0102] These methods allow proper time synchronization during initial access to multiple frequencies.

[0103] <<<<Frequency Synchronization>>> The UE may determine the first frequency as a reference for frequency synchronization.

[0104] The UE may estimate / derive frequency synchronization of the second frequency based on frequency synchronization of the first frequency.

[0105] For example, the UE may estimate / derive the frequency synchronization of the second frequency based on the difference in frequency synchronization of the first frequency (e.g., the difference between the first frequency and the second frequency).

[0106] In addition, the UE may not need to perform frequency synchronization (or frequency synchronization correction) of the second frequency.

[0107] At this time, the UE may perform frequency synchronization with the second frequency (correction of frequency synchronization) based on reception of the DL channel / signal after reception of the synchronization signal / PBCH.

[0108] These methods allow proper frequency synchronization during initial access to multiple frequencies.

[0109] <<<<Cell Information>>> The UE may receive information about the cell of the first frequency (e.g., cell information / cell ID) using the synchronization signal / PBCH.

[0110] The UE may assume / determine that the cell IDs of the first frequency and the second frequency are the same, in other words, the UE may not explicitly receive information about the second frequency cell.

[0111] The UE may also receive information about the second frequency cell (e.g., cell ID) using higher layer signaling (e.g., system information (e.g., SIB1) / PBCH).

[0112] According to these methods, it is possible to appropriately obtain information about a cell in initial access to multiple frequencies.

[0113] <<<<Control Information (PDCCH) / System Information (Information Necessary for Receiving SIB1 (SIB1 PDSCH))>>> The UE may receive information (e.g., PDCCH / SIB1 / SIB1 PDSCH) necessary for transmitting the first message.

[0114] In the present disclosure, information necessary for transmitting the first message, information regarding the transmission of the first message, settings related to the first message, PDCCH, system information, SIB1, and SIB1 PDSCH may be read as interchangeable.

[0115] The UE may receive information regarding the PDCCH / SIB1 / SIB1 PDSCH (e.g., information for receiving the PDCCH / SIB1 / SIB1 PDSCH) on the first frequency.

[0116] The UE may not receive the information on the second frequency.

[0117] For example, the UE may assume / determine that information regarding the PDCCH / SIB1 / SIB1 PDSCH on the second frequency is included in information regarding the PDCCH / SIB1 / SIB1 PDSCH on the first frequency.

[0118] For example, the UE may receive information regarding the PDCCH / SIB1 / SIB1 PDSCH on the second frequency using the first frequency.

[0119] For example, the UE may estimate / derive information regarding the PDCCH / SIB1 / SIB1 PDSCH in the second frequency based on information regarding the PDCCH / SIB1 / SIB1 PDSCH in the first frequency.

[0120] According to these methods, it is possible to appropriately acquire information for transmitting a first message in initial access to a plurality of frequencies.

[0121] According to embodiment 1-1, even when the synchronization signal / PBCH is transmitted from one cell, operations up to initial access can be performed appropriately.

[0122] <<Embodiment 1-2>> Of the synchronization signal and the PBCH, only the synchronization signal may be transmitted from one cell.

[0123] The UE may assume / determine that the PBCH is transmitted from each frequency / cell among multiple frequencies.

[0124] 7 is a diagram illustrating an example of reception of a synchronization signal / PBCH according to embodiment 1-2. In the example illustrated in FIG. 7, a UE receives a synchronization signal in F#1 and receives a PBCH in F#1 and F#2.

[0125] Among the multiple frequencies, a frequency on which the PBCH is not transmitted may be specified / set.

[0126] In this embodiment, the above embodiment 1-1 may be applied as appropriate to at least one of time synchronization, frequency synchronization, and cell information acquisition.

[0127] For example, in the above embodiment 1-1, in at least one of time synchronization (derivation / estimation / correction), frequency synchronization (derivation / estimation / correction), and cell information (acquisition / derivation / estimation / correction), the operations related to acquisition / derivation / estimation / correction may be performed using PBCH.

[0128] According to embodiment 1-2, even when a synchronization signal is transmitted from one cell and a PBCH is transmitted from each cell, operations up to initial access can be performed appropriately.

[0129] <<Embodiment 1-3>> Of the synchronization signal and the PBCH, [only] the PBCH may be transmitted from one cell.

[0130] The UE may assume / determine that a synchronization signal is transmitted from each frequency / cell of the multiple frequencies.

[0131] 8 is a diagram illustrating an example of reception of a synchronization signal / PBCH according to embodiments 1 to 3. In the example illustrated in FIG. 8, a UE receives a PBCH in F#1 and receives synchronization signals in F#1 and F#2.

[0132] The UE may obtain at least one of time synchronization, frequency synchronization, and cell information based on synchronization signals transmitted from each frequency / cell.

[0133] In this embodiment, the above embodiment 1-1 may be applied as appropriate to obtain information related to PDCCH / SIB1 / SIB1 PDSCH.

[0134] According to embodiments 1 to 3, even when the PBCH is transmitted from one cell and the synchronization signal is transmitted from each cell, operations up to the initial access can be performed appropriately.

[0135] <<Embodiment 1-4>> The UE may use a specific method to determine whether to perform initial access in the second frequency.

[0136] This embodiment can be applied to any of the higher-level embodiments 1-1 to 1-3.

[0137] <<<Embodiment 1-4-1>>> The UE may determine / decide whether to perform initial access in the second frequency based on the reception quality of a signal / channel (e.g., a synchronization signal / PBCH) in the first frequency.

[0138] For example, the UE may determine to perform (or not perform) initial access on the second frequency if the reception quality of the signal / channel on the first frequency (or a value based on the reception quality and a specific offset value) is greater than (or equal to or greater than) a specific threshold.

[0139] For example, the UE may decide not to perform (or to perform) initial access on the second frequency if the reception quality of the signal / channel on the first frequency (or a value based on the reception quality and a specific offset value) is less than (or equal to or less than) a specific threshold.

[0140] The offset value / threshold value may be defined in advance in a specification, or may be set using higher layer signaling (e.g., synchronization signal / system information (e.g., SIB1) / PBCH).

[0141] <<<Embodiment 1-4-2>>> The UE may determine / decide whether to perform initial access in the second frequency by using a synchronization signal / PBCH / system information (e.g., SIB1) received in the first frequency.

[0142] <<<Embodiment 1-4-3>>> The UE may determine / decide whether to perform initial access in the second frequency based on the reception quality of the synchronization signal / PBCH received in the second frequency.

[0143] For example, the UE may determine to perform (or not perform) initial access on the second frequency if the reception quality of the synchronization signal / PBCH on the second frequency (or a value based on the reception quality and a specific offset value) is greater than (or equal to or greater than) a specific threshold.

[0144] For example, the UE may determine not to perform (or to perform) initial access on the second frequency if the reception quality of the synchronization signal / PBCH on the second frequency (or a value based on the reception quality and a specific offset value) is less than (or equal to or less than) a specific threshold value.

[0145] The offset value / threshold value may be defined in advance in a specification, or may be set using higher layer signaling (e.g., synchronization signal / system information (e.g., SIB1) / PBCH).

[0146] Note that embodiment 1-4-3 may be applied to the cases of embodiments 1-2 / 1-3 above.

[0147] <<<Embodiment 1-4-4>>> The UE may perform power measurement (for example, Received Signal Strength Indicator (RSSI) measurement) on the second frequency.

[0148] The UE may receive the configuration for the power measurement using the first frequency.

[0149] The UE may determine / decide whether to perform initial access on the second frequency based on the result of the power measurement.

[0150] For example, the UE may decide to perform (or not perform) initial access on the second frequency if the result of the power measurement (or a value based on the result and a specific offset value) is greater than (or equal to or greater than) a specific threshold.

[0151] For example, the UE may decide not to perform (or to perform) initial access on the second frequency if the result of the power measurement (or a value based on the result and a specific offset value) is less than (or equal to or less than) a specific threshold.

[0152] The offset value / threshold value may be defined in advance in a specification, or may be set using higher layer signaling (e.g., synchronization signal / system information (e.g., SIB1) / PBCH).

[0153] <<<Embodiment 1-4-5>>> The UE may [always] assume / determine that it will perform initial access on the second frequency in addition to the first frequency.

[0154] The UE may determine / decide whether to perform initial access on the second frequency based on whether it receives (is able to receive) a specific DL signal (e.g., a second message) on the second frequency.

[0155] For example, if the UE receives (is able to receive) a specific DL signal (e.g., a second message) on a second frequency, the UE may determine / decide to perform initial access on that frequency.

[0156] For example, if the UE does not receive (is not able to receive) a specific DL signal (e.g., a second message) on the second frequency, the UE may determine / decide not to perform initial access on that frequency.

[0157] The UE may attempt to receive the particular DL signal for a particular period of time (eg, while a particular timer is running).

[0158] For example, the UE may determine that it is capable of receiving the specific DL signal if it receives the specific DL signal in the specific period.

[0159] For example, if the UE does not receive the specific DL signal during the specific period, the UE may determine that it is not capable of receiving the specific DL signal.

[0160] The specific period / timer may be specified in advance in a specification, or may be set using higher layer signaling (e.g., synchronization signal / system information (e.g., SIB1) / PBCH).

[0161] According to the first to fourth embodiments, it is possible to appropriately determine whether to perform initial access in the second frequency.

[0162] According to the first embodiment described above, it is possible to appropriately define the transmission of the synchronization signal / PBCH when a plurality of frequencies are used, and to perform an appropriate initial access operation.

[0163] Second Embodiment The second embodiment relates to information required for transmitting a synchronization signal / PBCH / first message (for example, PRACH).

[0164] The UE may be configured with the plurality of frequencies (combinations) in advance.

[0165] For example, the UE may be pre-configured with one carrier that includes the multiple frequencies.

[0166] The UE may also receive information about multiple frequencies (combinations) using higher layer signaling (e.g., system information (e.g., SIB1) / PBCH).

[0167] The UE may receive, on the first frequency only, at least one of a synchronization signal, a PBCH, and information regarding transmission of the first message (e.g., PDCCH / SIB1 / SIB1 PDSCH).

[0168] Information regarding the transmission of the first message on the second frequency (e.g., information necessary for the transmission of the first message, which may also be referred to as settings regarding the first message) may be transmitted, for example, using a signal on the first frequency (e.g., SIB1).

[0169] For example, the configuration for the first message may be a common configuration (eg, a common RACH configuration) in the first frequency and the second frequency.

[0170] For example, the setting for the first message may be different for each frequency (for example, each of the first frequency and the second frequency).

[0171] For example, a signal (e.g., SIB1) on a first frequency may include (information corresponding to) an SSB index for deriving a transmission opportunity (e.g., a RACH occasion) for a first message on a second frequency.

[0172] For example, the derivation of the transmission opportunity (e.g., RACH occasion) for the first message on the second frequency may be performed in common with or separately from the derivation of the transmission opportunity for the first message on the first frequency.

[0173] The UE may obtain time synchronization / frequency synchronization for transmitting / receiving the first / second / third / fourth messages according to at least one method of the above first embodiment.

[0174] The UE may receive, using a specific signal (e.g., SIB1), a configuration for monitoring a control channel (PDCCH) to receive a second message on a second frequency.

[0175] According to the second embodiment described above, even when at least one of a synchronization signal, a PBCH, and information related to the transmission of a first message is received at one frequency, it is possible to appropriately acquire information necessary for transmitting the first message.

[0176] Third Embodiment The third embodiment relates to information required for transmitting a synchronization signal / PBCH / first message (for example, PRACH).

[0177] The UE may be configured with the plurality of frequencies (combinations) in advance.

[0178] For example, the UE may be pre-configured with one carrier that includes the multiple frequencies.

[0179] The UE may also receive information about multiple frequencies (combinations) using higher layer signaling (e.g., system information (e.g., SIB1) / PBCH).

[0180] The UE may also determine the frequency / cell to connect to based on information about multiple frequencies (combinations) that it receives.

[0181] The UE may receive at least one of a synchronization signal, a PBCH, and information regarding transmission of the first message (e.g., PDCCH / SIB1 / SIB1 PDSCH) on each frequency.

[0182] At this time, the UE may receive / acquire the configuration regarding the first message for each frequency from each frequency.

[0183] According to the second embodiment described above, even when at least one of a synchronization signal, a PBCH, and information related to the transmission of the first message is received at each frequency, it is possible to appropriately acquire the information necessary for transmitting the first message.

[0184] <Fourth Embodiment> The fourth embodiment relates to the order of initial access operations for a plurality of frequencies.

[0185] The UE may perform initial access on multiple frequencies simultaneously / in a specific order.

[0186] If the UE determines that initial access is possible for multiple frequencies, it may perform initial access for multiple frequencies simultaneously / in a specific order.

[0187] For example, the UE may transmit and receive corresponding nth (n is an integer from 1 to 4) messages to and from a first frequency (base station) and a second frequency (base station) simultaneously or within a specific period of time.

[0188] The specific period may be defined in advance in a specification, or may be set using higher layer signaling (e.g., synchronization signal / system information (e.g., SIB1) / PBCH).

[0189] The UE may also perform initial access to multiple frequencies in a specific priority order.

[0190] The specific priority may be, for example, a priority based on frequency, and a priority for each frequency may be defined / set.

[0191] For example, the UE may assume / determine that a lower (or higher) frequency has a higher priority.

[0192] For example, the UE may perform initial access using a set priority for each frequency.

[0193] The priority may also be based on the reception quality of the signal, for example.

[0194] For example, the UE may determine that frequencies with higher signal reception quality have higher priority.

[0195] The order of each procedure of initial access will be described below. It is assumed that the UE performs initial access to frequency A and frequency B in the order from frequency A to frequency B.

[0196] In this case, the order of frequencies for initial access may indicate the order for each procedure.

[0197] For example, the UE may transmit a first message on frequency A, then a first message on frequency B. After this, the UE may receive a second message from frequency A, then a second message from frequency B (and similarly for the third / fourth messages).

[0198] The second and fourth messages transmitted from the NW may not follow the order of the frequencies. In other words, the order of the frequencies for the initial access may indicate the order of the procedures (e.g., procedures 1 and 3) transmitted by the UE.

[0199] In this case, the order of frequencies related to initial access may indicate the order in the entire initial access procedure.

[0200] For example, the UE may transmit and receive the first to fourth messages for frequency A (to complete initial access for frequency A), and then transmit and receive the first to fourth messages for frequency B (to complete initial access for frequency B).

[0201] According to the fourth embodiment, the order of the initial access procedures for a plurality of frequencies can be appropriately defined.

[0202] <Variations> Note that, although the embodiments in the present disclosure have been mainly described using initial access as an example, the embodiments can also be applied to operations after RRC connection (for example, RRC reconfiguration).

[0203] In this case, for example, the higher layer signaling in each embodiment may include RRC signaling / RRC reconfiguration messages.

[0204] Furthermore, the multiple frequencies that are the target of initial access and the multiple frequencies that are the target of RRC reconnection may be partially or entirely different.

[0205] Each embodiment of the present disclosure can be applied to a cell-free configuration, and is not limited to application to a cell-free configuration.

[0206] In the case of a cell-free configuration, the first cell (e.g., a super cell) that is the target of initial access and the first cell that is the target of RRC reconnection may be the same cell.

[0207] In the case of a cell-free configuration, some or all of the multiple cells (second cells (e.g., cells)) that are the target of initial access and the multiple cells (second cells) that are the target of RRC reconnection may be different.

[0208] The UE may assume / judge that a cell corresponding to a frequency (first frequency) at which it receives a synchronization signal / PBCH is a special cell (e.g., a primary cell), and may assume / judge that a cell corresponding to a frequency (second frequency) at which it does not receive a synchronization signal / PBCH is another cell (e.g., a secondary cell).

[0209] <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.

[0210] 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.

[0211] 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.

[0212] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0213] <<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.

[0214] 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.

[0215] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0216] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0217] <<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.

[0218] The particular UE capability may indicate support for the particular process / operation / control / assumptions / information (e.g., initial access to multiple frequencies and / or synchronization signals / PBCH for the initial access).

[0219] 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).

[0220] 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)).

[0221] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0222] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal having a receiving unit that receives a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells, and a control unit that controls acquisition of at least one of time synchronization, frequency synchronization, cell information, and configuration related to a first message in the initial access procedure for the plurality of cells based on at least one of the synchronization signal and the physical broadcast channel. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein at least one of the synchronization signal, the physical broadcast channel, and the configuration is transmitted from one cell of the plurality of cells. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein at least one of the synchronization signal, the physical broadcast channel, and the configuration is transmitted from each of the plurality of cells. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the control unit determines an order of the initial access procedure for each of the plurality of cells based on a specific priority.

[0223] (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.

[0224] 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).

[0225] 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.

[0226] 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.

[0227] 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))).

[0228] 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.

[0229] 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.

[0230] 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).

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0237] 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).

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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).

[0242] 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.

[0243] 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.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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).

[0251] (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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0268] 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.

[0269] 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.

[0270] The transceiver 120 may transmit a synchronization signal and a physical broadcast channel for an initial access procedure to a plurality of cells. The controller 110 may use at least one of the synchronization signal and the physical broadcast channel to instruct acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells (first embodiment).

[0271] (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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] The transceiver 220 may receive a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells. The controller 210 may control acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells, based on at least one of the synchronization signal and the physical broadcast channel (first embodiment).

[0290] At least one of the synchronization signal, the physical broadcast channel, and the configuration may be transmitted from one cell of the plurality of cells (second embodiment).

[0291] At least one of the synchronization signal, the physical broadcast channel, and the configuration may be transmitted from each of the plurality of cells (third embodiment).

[0292] The control unit may determine the order of the initial access procedures for each of the plurality of cells based on a specific priority (fourth embodiment).

[0293] (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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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).

[0305] 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.

[0306] 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.

[0307] 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.

[0308] (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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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."

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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.

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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).

[0336] 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).

[0337] 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).

[0338] 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.

[0339] 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), these wired and / or wireless technologies are included within the definition of transmission media.

[0340] 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).

[0341] 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.

[0342] 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.

[0343] 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.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 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.

[0349] 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.

[0350] 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.

[0351] 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.

[0352] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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.

[0357] 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.

[0358] 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.

[0359] 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).

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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).

[0366] 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.

[0367] 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)).

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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).

[0374] 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."

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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...."

[0380] 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).

[0381] 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.

[0382] 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."

[0383] 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.

[0384] 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."

[0385] 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.

[0386] 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.

[0387] 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").

[0388] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0389] 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.

[0390] 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.

[0391] 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 a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells; and a control unit that controls the acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells based on at least one of the synchronization signal and the physical broadcast channel.

2. The terminal according to claim 1, wherein at least one of the synchronization signal, the physical broadcast channel, and the configuration is transmitted from one cell of the plurality of cells.

3. The terminal according to claim 1, wherein at least one of the synchronization signal, the physical broadcast channel, and the configuration is transmitted from each of the plurality of cells.

4. The terminal according to claim 1, wherein the control unit determines an order of initial access procedures for each of the plurality of cells based on a specific priority.

5. A wireless communication method for a terminal, comprising: a step of receiving a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells; and a step of controlling the acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells based on at least one of the synchronization signal and the physical broadcast channel.

6. A base station having: a transmitter that transmits a synchronization signal and a physical broadcast channel for an initial access procedure for a plurality of cells; and a controller that uses at least one of the synchronization signal and the physical broadcast channel to instruct the acquisition of at least one of time synchronization, frequency synchronization, cell information, and settings related to a first message in the initial access procedure for the plurality of cells.

Images