Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives at least a first synchronization signal block transmitted in a first band, among the first synchronization signal block and a second synchronization signal block transmitted in a second band wider than the first band; and a control unit that controls an initial access procedure on the basis of at least the first synchronization signal block. Said one aspect of the present disclosure makes it possible to appropriately perform the initial access procedure.

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 5G NR (for example, 3GPP Rel. 17 and later), in order to support various use cases such as the Internet of Things (IoT), a Reduced UE capability (RedCap) UE is defined / supported, which has reduced capabilities compared to a normal terminal (user terminal, User Equipment (UE)).

[0006] In future wireless communication systems (e.g., 6G), the use of a new RedCap UE (also called a 6G RedCap UE) that has reduced required capabilities (e.g., supports a narrower band than the existing RedCap UE) than the existing RedCap UE (also called a conventional RedCap UE or a 5G NR RedCap UE) is being considered.

[0007] However, if the band supported by the new RedCap UE is narrower than the band supported by the existing RedCap UE, it may not be possible to properly perform the initial access procedure using a synchronization signal block (SSB) with the same frequency bandwidth as the conventional one. If the initial access procedure is not properly performed, there is a risk that system performance, such as a decrease in communication throughput, may be degraded.

[0008] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can properly perform initial access.

[0009] A terminal according to one aspect of the present disclosure is characterized in that it has a receiving unit that receives at least a first synchronization signal block transmitted in a first band and a second synchronization signal block transmitted in a second band that is wider than the first band, and a control unit that controls an initial access procedure based on at least the first synchronization signal block.

[0010] According to one aspect of the present disclosure, initial access can be performed appropriately.

[0011] FIG. 1 is a diagram showing an example of the configuration of SSB in 5G NR. FIGS. 2A and 2B are diagrams showing an example of frequency allocation of narrowband SSB and wideband SSB. FIGS. 3A and 3B are diagrams showing an example of frequency allocation of narrowband SSB and wideband SSB. FIGS. 4A to 4C are diagrams showing an example of a synchronization raster. FIG. 5 is a diagram showing an example of a sequence of SSB synchronization signals. FIG. 6 is a diagram showing an example of a sequence of SSB synchronization signals. FIG. 7 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 8 is a diagram showing an example of a configuration of a base station according to an embodiment. FIG. 9 is a diagram showing an example of a configuration of a user terminal according to an embodiment. FIG. 10 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 11 is a diagram showing an example of a vehicle according to an embodiment.

[0012] (RedCap UE) 5G NR (e.g., 3GPP Rel. 17 and later) supports the use of communication systems introduced in 3GPP Rel. 15 for use cases such as IoT. IoT use cases in 5G NR include, for example, industry wireless sensor networks (IWSNs), video surveillance systems, wearable devices, and conventional IoT use cases using LTE terminals (e.g., smart homes, smart water systems, electricity meters, smart traffic lights, etc.).

[0013] The conditions or capabilities (e.g., UE capabilities or requirements) required of a terminal applied to these use cases are reduced from the conditions or capabilities required of a UE defined or supported in Rel. 15 (e.g., an existing normal UE, also referred to as a Non-RedCap UE). In 5G NR, a UE in which the conditions or capabilities required of a terminal are reduced compared to a normal UE may be referred to as an existing RedCap UE, a conventional RedCap UE, a 5G NR RedCap UE, etc.

[0014] The existing RedCap UE is configured to use a smaller or narrower bandwidth for communication (Bandwidth reduction) than the existing normal UE.

[0015] In Rel. 15, existing normal UEs are required to support a predetermined bandwidth depending on the frequency range (e.g., Frequency Range (FR) 1, FR2). The bandwidth that the UE is required to support may be referred to as the maximum bandwidth (maximum channel bandwidth).

[0016] For example, in the first frequency range (FR1), the existing normal UEs are required to support a maximum bandwidth of 100 MHz, and in the second frequency range (FR2), the existing normal UEs are required to support a maximum bandwidth of 200 MHz.

[0017] On the other hand, the bandwidth supported by the existing RedCap UE (for example, mandatory bandwidth) is set to be narrower than the bandwidth supported by the existing normal UE.

[0018] For example, in the first frequency range (FR1), legacy RedCap UEs are required to support a maximum bandwidth of 20 MHz, and in the second frequency range (FR2), legacy RedCap UEs are required to support a maximum bandwidth of 100 MHz.

[0019] (Initial Access) In 5G NR, a synchronization signal block (SSB) is defined, which is a signal for a UE to perform time / frequency synchronization with a base station.

[0020] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0021] FIG. 1 is a diagram showing an example of the configuration of SSB in 5G NR. The SSB shown in FIG. 1 is arranged across four symbols. The PSS occupies one symbol (symbol #0) and 127 subcarriers (subcarriers #56 to #182), and the SSS occupies one symbol (symbol #2) and 127 subcarriers (subcarriers #56 to #182). The PBCH is configured across three symbols (symbols #1 to #3) and 240 subcarriers (subcarriers #0 to #239), but in one symbol (symbol #2), an unused portion (subcarriers #56 to #182) for the SSS is left. In symbol #2, there may be a portion between the SSS and the PBCH where neither the SSS nor the PBCH is arranged.

[0022] In the initial access procedure, the UE (in RRC_IDLE mode) receives the SS / PBCH block (SSB), transmits 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 the base station (network) transmits an ACK for Msg. 4 from the UE, an RRC connection is established (in RRC_CONNECTED mode).

[0023] 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).

[0024] 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).

[0025] 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.

[0026] 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.

[0027] A base station using beam correspondence transmits multiple SSBs using multiple beams for each SSB transmission period. The multiple SSBs have multiple SSB indices, respectively. When a UE detects an SSB, it transmits a PRACH in the RACH occasion associated with that SSB index and receives an RAR in the RAR window.

[0028] The frequency on which the UE searches for the PSS / SSS may be referred to as a synchronization raster.

[0029] In 5G NR, the center frequency of SSB is located on the synchronization raster.

[0030] A synchronization raster is defined for each frequency range (FR1 / FR2).

[0031] The wider the frequency interval of the synchronization rasters (the fewer the number of synchronization rasters), the shorter the time required for searching during initial access, and the lighter the load.

[0032] Candidates for frequency positions where component carriers (CCs) are arranged are called a channel raster.

[0033] The interval of the synchronization rasters is determined to satisfy a specific condition, specifically, the interval of the synchronization rasters is determined so that, no matter in which channel raster a CC is placed with a minimum channel bandwidth (CBW), there exists at least one synchronization raster in which the band of the SSB in the synchronization raster is included in the CBW.

[0034] If the UE fails to receive the SSB on a particular synchronization raster within a specific period of time, the length of which is up to the UE implementation, it attempts to receive the SSB on another synchronization raster.

[0035] During initial access, the order in which the UE searches for synchronization rasters is up to the UE implementation. For efficient searching, a Global Synchronization Channel Number (GSCN) is defined, and the UE is notified of the GSCN offset / GSCN range.

[0036] The frequencies to be searched for PSS / SSS other than at the time of initial access are instructed to the UE by the network (NW, for example, a base station).

[0037] For example, when instructed to measure RSRP / RSRQ / SINR for neighboring cells, the UE is instructed on the SSB frequency using the upper layer parameter "MeasObjectNR".

[0038] For example, when instructed to add a serving cell, the UE is instructed on the SSB frequency using the higher layer parameter "FrequencyInfoDL."

[0039] For example, a UE (in RRC_IDLE mode) is instructed on the SSB frequency using SIB4 (InterFreqCarrierFreqInfo).

[0040] (6G) Studies on 6G have begun. 6G is expected to require higher performance and various use cases as shown below. ・Ultra-coverage expansion / ultra-long distance communication ・Ultra-large capacity ・Ultra-reliable communication ・Virtual cell (UE centric no cell) ・Flexible NW ・Mesh NW / Side link

[0041] In 6G, operation using narrowband is assumed in anticipation of the Internet of Things (IoT). It is assumed that IoT terminals in 6G are terminals whose terminal requirements or capabilities are more limited than those of existing RedCap UEs. A normal / basic UE for at least one of 5G NR, 6G, or later communication technologies may be referred to as a normal UE or a wideband terminal. A wideband terminal may include a wideband UE that supports the bandwidth of an existing RedCap UE. In 6G, a UE whose terminal requirements or capabilities are reduced compared to those of an existing RedCap UE may be referred to as a new RedCap UE, a 6G RedCap UE, a narrowband terminal, etc.

[0042] In 5G NR, existing RedCap UEs monitor / receive SSB using the same bandwidth as existing normal UEs. For example, when the subcarrier spacing is 15 kHz, the SSB bandwidth is approximately 1.9 MHz.

[0043] However, if the new RedCap UE only supports a bandwidth (e.g., 1 MHz) narrower than the SSB bandwidth supported in 5G NR, the new RedCap UE cannot monitor / receive the SSB.

[0044] It is conceivable that SSB will be the signal received by all terminals in the initial access procedure, and that 6G SSB will be designed based on an SSB having the same frequency bandwidth as 5G NR. In this case, adding narrowband SSB (SSB for new RedCap UE, SSB that new RedCap UE can monitor / receive) in a subsequent release would be inefficient in terms of specifications and operation. Therefore, the addition of narrowband SSB needs to be considered from the beginning of 6G design.

[0045] Therefore, the present inventors came up with the idea of ​​an initial access procedure using narrowband SSB.

[0046] 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.

[0047] 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."

[0048] In this disclosure, an SSB having a bandwidth equal to or narrower than the maximum bandwidth supported by a narrowband terminal may be referred to as a narrowband SSB. An SSB having a bandwidth wider or larger than the maximum bandwidth supported by a narrowband terminal may be referred to as a wideband SSB. The bandwidth of a wideband SSB may be equal to or narrower than the maximum bandwidth supported by a wideband terminal.

[0049] In the present disclosure, the bandwidth of wideband SSB may be wider or larger than the bandwidth of narrowband SSB, in other words, wideband SSB may be transmitted in a wider band than the band in which narrowband SSB is transmitted.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0055] In the present disclosure, terms such as synchronization signal, synchronization signal block (SSB), primary synchronization signal (PSS), secondary synchronization signal (SSS), tertiary synchronization signal (TSS), quaternary synchronization signal (QSS), broadcast channel (Physical Broadcast Channel (PBCH)), narrowband SSB, and wideband SSB may be interchangeable.

[0056] In the present disclosure, SSB narrower than 5G NR SSB, narrowband SSB, 6G SSB, SSB having a first bandwidth, SSB transmitted in the first band, etc. may be read interchangeably.

[0057] In the present disclosure, 5G NR SSB, existing SSB, existing specification SSB, wideband SSB, SSB having a second bandwidth, SSB transmitted in the second band, etc. may be read interchangeably.

[0058] In the present disclosure, the terms position, arrangement, resource, band, frequency, candidate, synchronization raster, existing synchronization raster, narrowband synchronization raster, wideband synchronization raster, common synchronization raster, composite synchronization raster, etc. may be read interchangeably.

[0059] In the present disclosure, the terms terminal, narrowband terminal, new RedCap UE, terminal supporting the first bandwidth, etc. may be read interchangeably.

[0060] In the present disclosure, terminal, wideband terminal, existing normal UE, existing RedCap UE, normal UE, terminal supporting a bandwidth wider than the first bandwidth, terminal supporting the second bandwidth, etc. may be read interchangeably.

[0061] In this disclosure, terms such as search, probe, monitor, receive, decode, detect, and acquire may be read interchangeably.

[0062] (Wireless Communication Method) First Embodiment The first embodiment relates to setting time / frequency resources for narrowband SSB and wideband SSB.

[0063] The synchronization signal and PBCH may be defined separately, or the synchronization signal and PBCH may be defined together as an SSB, as in 5G NR.

[0064] Frequency Resources Any of the following options may be defined for narrowband SSB and wideband SSB: Option 1: Narrowband SSB and wideband SSB are discontinuous in the frequency direction. Option 2: Narrowband SSB and wideband SSB are contiguous in the frequency direction.

[0065] The above Option 1 may mean that a space / gap is provided in the frequency direction between the narrowband SSB and the wideband SSB, or that no specific signal (e.g., synchronization signal / PBCH) is set / transmitted between the narrowband SSB and the wideband SSB.

[0066] The above Option 2 may mean that there is no interval / gap in the frequency direction between the narrowband SSB and the wideband SSB, or that a specific signal (e.g., a synchronization signal / PBCH) is set / transmitted between the narrowband SSB and the wideband SSB.

[0067] 2A and 2B are diagrams showing an example of Option 1. In Option 1, as shown in FIGS. 2A and 2B, narrowband SSB and wideband SSB are discontinuous in the frequency direction. Regarding the frequency allocation of narrowband SSB and wideband SSB, as shown in FIG. 2A, narrowband SSB may be set / transmitted at a lower frequency than wideband SSB, and wideband SSB may be set / transmitted at a higher frequency than narrowband SSB. Alternatively, as shown in FIG. 2B, narrowband SSB may be set / transmitted at a higher frequency than wideband SSB, and wideband SSB may be set / transmitted at a lower frequency than narrowband SSB.

[0068] 3A and 3B are diagrams showing an example of Option 2. In Option 2, as shown in FIGS. 3A and 3B, narrowband SSB and wideband SSB are continuous in the frequency direction. Regarding the frequency allocation of narrowband SSB and wideband SSB, as shown in FIG. 3A, narrowband SSB may be set / transmitted at a lower frequency than wideband SSB, and wideband SSB may be set / transmitted at a higher frequency than wideband SSB. Alternatively, as shown in FIG. 3B, narrowband SSB may be set / transmitted at a higher frequency than wideband SSB, and wideband SSB may be set / transmitted at a lower frequency than narrowband SSB.

[0069] [Time Resources] Narrowband SSB and wideband SSB may be configured / transmitted in the same time resource (frequency division multiplexed (FDM)) or in different time resources (time division multiplexed (TDM)).

[0070] When narrowband SSB and wideband SSB are configured / transmitted in different time resources, the narrowband SSB and wideband SSB may overlap in the frequency direction (may be TDM'd) or may not overlap (may be TDM'd and FDM'd).

[0071] The size / length (e.g., number of symbols) of the time resource for narrowband SSB and wideband SSB may be the same. In this case, it is not necessary to consider the size / length of the time resource depending on whether the SSB to be transmitted is narrowband SSB or wideband SSB, thereby reducing the processing load associated with setting the SSB resource.

[0072] The size / length (e.g., number of symbols) of the time resources of narrowband SSB and wideband SSB may be different. For example, the number of symbols of narrowband SSB may be greater than the number of symbols of wideband SSB. In this case, the amount of information transmitted by narrowband SSB can be increased because the resources of narrowband SSB are increased.

[0073] According to the first embodiment described above, in an initial access procedure using both narrowband SSB and wideband SSB, time / frequency resources for narrowband SSB and wideband SSB can be appropriately set.

[0074] Second Embodiment In a second embodiment, the broadband terminal and the narrowband terminal always probe the narrowband SSB in the initial access procedure.

[0075] A synchronization raster (also referred to as a narrowband synchronization raster) that is a candidate for the center frequency of a narrowband SSB may be specified. In this case, a broadband terminal and a narrowband terminal may perform a search for an SSB arranged in the narrowband synchronization raster. Furthermore, a broadband terminal and a narrowband terminal may not (or may not assume) to perform a search for an SSB that is not arranged in the narrowband synchronization raster. The narrowband synchronization raster may be the same as or different from a synchronization raster (also referred to as an existing synchronization raster) in an existing specification (e.g., 5G NR).

[0076] In addition to the narrowband synchronization raster, synchronization rasters that are candidates for the center frequency of wideband SSB (also called wideband synchronization rasters) may be defined.

[0077] The wideband synchronization raster may be the same as the narrowband synchronization raster, in which case a common synchronization raster (also called a common synchronization raster) may be defined in place of the narrowband synchronization raster and the wideband synchronization raster, which is a candidate for both the narrowband SSB center frequency and the wideband SSB center frequency.

[0078] The broadband synchronization raster and the narrowband synchronization raster may be defined separately, in other words, the broadband synchronization raster may be different from the narrowband synchronization raster.

[0079] The wideband synchronous raster may be the same as the existing synchronous raster, or it may be different.

[0080] Furthermore, when the narrowband SSB and the wideband SSB are continuous in the frequency direction, in addition to at least one of the narrowband synchronization raster, wideband synchronization raster, and common synchronization raster described above, a synchronization raster (also called a composite synchronization raster) may be defined that is a candidate for the center frequency of a band combining the narrowband SSB band and the wideband SSB band (a composite band, a band from the lowest frequency to the highest frequency of the narrowband SSB and the wideband SSB).

[0081] 4A-4C are diagrams showing examples of synchronization rasters. In FIG. 4A, the narrowband synchronization raster and the wideband synchronization raster are different, and the frequency-direction arrangement of the narrowband SSB is determined so that the center frequency of the narrowband SSB is located on the narrowband synchronization raster, while the frequency-direction arrangement of the wideband SSB is determined so that the center frequency of the wideband SSB is located on the wideband synchronization raster. In FIG. 4B, the frequency-direction arrangement of the narrowband SSB and the wideband SSB is determined so that the center frequencies of both the narrowband SSB and the wideband SSB are located on the common synchronization raster. In FIG. 4C, the frequency-direction arrangement of the narrowband SSB and the wideband SSB is determined so that the center frequency of the combined band of the narrowband SSB and the wideband SSB (composite band, the band from the lowest frequency to the highest frequency of the narrowband SSB and the wideband SSB, bandwidth W) is located on the composite synchronization raster.

[0082] A broadband terminal may scan for a wideband SSB after receiving a narrowband SSB. A narrowband terminal may not scan for a wideband SSB after receiving a narrowband SSB.

[0083] A broadband terminal may receive / detect / decode the narrowband SSB to recognize / identify the time / frequency resource of the wideband SSB and receive the wideband SSB in that time / frequency resource.

[0084] The relative positions (e.g., time offset / frequency offset) between the narrowband SSB and the wideband SSB may be specified in the specifications. A wideband terminal receiving the narrowband SSB may recognize / identify the time / frequency resources of the wideband SSB based on the time / frequency resources of the narrowband SSB and the relative positions. For example, a wideband terminal receiving the narrowband SSB may recognize / identify the time position of the wideband SSB by adding a time offset to the time position of the narrowband SSB. Similarly, a wideband terminal receiving the narrowband SSB may recognize / identify the time position of the wideband SSB by adding a frequency offset to the frequency position of the narrowband SSB. In the present disclosure, the time offset may be a symbol offset, a slot offset, etc. In the present disclosure, the frequency offset may be a resource block (RB) offset, a resource element (RE) offset, etc.

[0085] The specification may specify the relative positions (e.g., time offset / frequency offset) between the narrowband SSB and each of one or more candidate transmission resources for the wideband SSB. The wideband SSB may be transmitted in some or all of the one or more candidate transmission resources. A wideband terminal receiving the narrowband SSB may recognize / identify one or more candidate transmission resources for the wideband SSB based on the time / frequency resource and the relative positions of the narrowband SSB, and may attempt to receive the wideband SSB in the one or more candidate transmission resources. For example, if two wideband SSB transmission candidate resources (e.g., transmission candidate resource X and transmission candidate resource Y) are configured / defined for one narrowband SSB, a wideband terminal receiving the narrowband SSB may recognize / identify the time position of wideband SSB transmission candidate resource X by adding time offset X to the time position of the narrowband SSB, or may recognize / identify the time position of wideband SSB transmission candidate resource Y by adding time offset Y to the time position of the narrowband SSB. Similarly, a wideband terminal receiving the narrowband SSB may recognize / identify the frequency position of wideband SSB transmission candidate resource X by adding frequency offset X to the frequency position of the narrowband SSB, or may recognize / identify the frequency position of wideband SSB transmission candidate resource Y by adding frequency offset Y to the frequency position of the narrowband SSB. In this case, the wideband terminal may attempt to receive the wideband SSB at transmission candidate resource X and transmission candidate resource Y.

[0086] Alternatively, the narrowband SSB may be used to indicate / configure the time / frequency resources of the wideband SSB to the wideband terminal. In this case, the narrowband SSB may include information about the time / frequency resources of the wideband SSB. This information may indicate the relative position between the narrowband SSB and the wideband SSB (e.g., a time offset / frequency offset), or may indicate the absolute position of the wideband SSB (i.e., a specific time / frequency resource) (e.g., a specific symbol / slot index, a specific RB / RE index). The wideband terminal may receive (or assume to receive) the wideband SSB in the time / frequency resources indicated by the narrowband SSB.

[0087] A broadband terminal may perform an initial access procedure using broadband resources by receiving a narrowband SSB followed by a broadband SSB. For example, a broadband terminal that receives a narrowband SSB followed by a broadband SSB may recognize / identify the bandwidth of the broadband SSB as the bandwidth to be used for the initial access procedure (initial access bandwidth). Furthermore, the initial access bandwidth may be indicated / notified to the broadband terminal using at least one of the narrowband SSB and the broadband SSB.

[0088] When the narrowband SSB and the wideband SSB are continuous in the frequency direction, a wideband terminal that receives the wideband SSB after receiving the narrowband SSB may recognize / identify the combined band of the narrowband SSB and the wideband SSB as the initial access band.

[0089] When the narrowband SSB and the wideband SSB are discontinuous in the frequency direction, a wideband terminal that receives the wideband SSB after receiving the narrowband SSB may recognize / identify a band that includes the narrowband SSB band and the wideband SSB band as the initial access band. In this case, the initial access band may or may not include at least one of an interval, a gap, or a band of a specific signal between the narrowband SSB and the wideband SSB.

[0090] A terminal that does not receive (or is unable to receive) a wideband SSB after receiving a narrowband SSB may recognize / identify the narrowband SSB band as the initial access band.

[0091] According to the second embodiment described above, in an initial access procedure that uses both narrowband SSB and wideband SSB, wideband terminals can properly receive narrowband SSB and wideband SSB, and narrowband terminals can properly receive narrowband SSB.

[0092] Third Embodiment In a third embodiment, in the initial access procedure, a broadband terminal searches for either narrowband SSB or wideband SSB, and a narrowband terminal always searches for narrowband SSB.

[0093] A broadband terminal may probe both narrowband and wideband SSB, in which case rules / constraints / priorities for receiving narrowband and wideband SSB may be defined.

[0094] For example, if the time-direction resources of the narrowband SSB and the wideband SSB are different (or do not overlap) (e.g., if the start symbols of the narrowband SSB and the wideband SSB are different), the wideband terminal may prioritize receiving the SSB that was transmitted first between the narrowband SSB and the wideband SSB.

[0095] When the narrowband SSB and the wideband SSB have the same (or overlap) time-direction resources (e.g., when the narrowband SSB and the wideband SSB have the same start symbol), the wideband terminal may receive at least one of the narrowband SSB and the wideband SSB. When the wideband terminal receives only the narrowband SSB, it may prioritize reception of the wideband SSB associated with the narrowband SSB or the wideband SSB indicated / notified by the narrowband SSB, as in the second embodiment.

[0096] Alternatively, the broadband terminal may always probe for broadband SSB.

[0097] In the third embodiment, as in the second embodiment, a common synchronization raster may be defined, or a narrowband synchronization raster and a wideband synchronization raster may be defined separately. Also, in addition to at least one of the narrowband synchronization raster, the wideband synchronization raster, and the common synchronization raster, a composite synchronization raster may be defined.

[0098] According to the third embodiment described above, in an initial access procedure that uses both narrowband SSB and wideband SSB, a wideband terminal can properly receive at least one of the narrowband SSB and the wideband SSB, and a narrowband terminal can properly receive the narrowband SSB.

[0099] <Fourth Embodiment> The fourth embodiment relates to a sequence of SSB synchronization signals.

[0100] A sequence of a narrowband SSB synchronization signal (e.g., PSS / SSS) and a sequence of a wideband SSB synchronization signal (e.g., PSS / SSS) may be associated with each other. A terminal may obtain different sequences depending on the frequency (e.g., synchronization raster) / bandwidth (e.g., maximum channel bandwidth) of the synchronization signal to be decoded.

[0101] FIG. 5 is a diagram showing an example of a sequence of an SSB synchronization signal. In FIG. 5, narrowband SSB and wideband SSB are continuous in the frequency direction, and the time resources of the narrowband SSB and the wideband SSB are the same (overlapping). Sequence B of the wideband SSB synchronization signal may be part of sequence A. Sequence C of the narrowband SSB synchronization signal may be a portion of sequence A other than sequence B. In other words, sequence A may be obtained by combining sequence C and sequence B. The length of sequence A may be the number of resource elements (REs) to which the narrowband SSB synchronization signal and the wideband SSB synchronization signal are mapped. The length of sequence B may be the number of REs to which the wideband SSB synchronization signal is mapped. The length of sequence C may be the number of REs to which the narrowband SSB synchronization signal is mapped. The broadband terminal may decode / detect / receive both narrowband SSB and wideband SSB to obtain sequence A, may decode / detect / receive only wideband SSB to obtain sequence B, or may decode only narrowband SSB to obtain sequence C. The narrowband terminal may decode / detect / receive only narrowband SSB to obtain sequence C.

[0102] At least one of a narrowband synchronization raster, a wideband synchronization raster, a common synchronization raster, and a composite synchronization raster may be defined as a frequency on which SSB can be placed.

[0103] The narrowband SSB may be located at a higher frequency than the wideband SSB, or may be located at a lower frequency than the wideband SSB.

[0104] Alternatively, the narrowband SSB may be located within the band / resource of the wideband SSB. In other words, the narrowband SSB may be a portion of the wideband SSB, and the narrowband terminal may receive a portion of the wideband SSB (a portion of the wideband SSB located in the band supported by the narrowband terminal). In this case, the synchronization signal (e.g., PSS / SSS) of the wideband SSB may include multiple sequences. Each of the multiple sequences may be a specific sequence (e.g., an M sequence). One of the multiple sequences may be a sequence of the synchronization signal (e.g., PSS / SSS) of the narrowband SSB (a portion of the wideband SSB).

[0105] 6 is a diagram showing an example of an SSB synchronization signal sequence. In FIG. 6, narrowband SSB (a portion of wideband SSB that can be received by narrowband terminals) is allocated within the band / resources of wideband SSB. A wideband terminal may decode the wideband SSB to obtain sequence D, or may decode the narrowband SSB (a portion of the wideband SSB) to obtain sequence E. A narrowband terminal may decode the narrowband SSB to obtain sequence E.

[0106] According to the fourth embodiment described above, in an initial access procedure using both narrowband SSB and wideband SSB, narrowband terminals and wideband terminals can appropriately acquire sequences.

[0107] Fifth Embodiment In a fifth embodiment, a broadband terminal and a narrowband terminal probe only narrowband SSB in the initial access procedure.

[0108] Narrowband SSB has fewer frequency resources than wideband SSB, and therefore the amount of information transmitted is more limited than with wideband SSB. Therefore, at least one of the following embodiments 5.1 to 5.4 may be specified by the specifications.

[0109] [Embodiment 5.1] The narrowband SSB may include at least one of a physical cell ID (PCI) and information (e.g., MIB, RMSI (SIB1), OSI) carried by the PBCH of existing specifications (e.g., 5G NR).

[0110] [Embodiment 5.2] Narrowband SSB may have larger / longer resources in the time direction than SSB in existing specifications (e.g., 5G NR).

[0111] Narrowband SSB may include one or more additional synchronization signals (eg, TSS, QSS, etc.) in addition to the synchronization signals of existing specifications (PSS / SSS).

[0112] Furthermore, the resources for the PBCH of the narrowband SSB may be extended in the time direction compared to the PBCH of the existing specifications. For example, the resources for the PBCH may be set after an additional synchronization signal.

[0113] [Embodiment 5.3] Specific information may be notified to broadband terminals and narrowband terminals using SIB.

[0114] The specific information may be at least one of information necessary to identify a cell ID, information related to a frequency (e.g., Subcarrier Spacing (SCS)), and information related to an SSB index.

[0115] [Embodiment 5.4] The amount of information notified / configured by narrowband SSB may be limited. For example, the flexibility of configuration for PDCCH / PDSCH for SIB1 may be specified to be lower than that of existing specifications (e.g., 5G NR).

[0116] For example, configuration information regarding the PDCCH for SIB1 notified by the MIB may be limited. In other words, the configuration information may not include specific information (e.g., the frequency granularity of the PDCCH for SIB1, the frequency offset between the narrowband SSB and the PDCCH for SIB1).

[0117] The number of narrowband SSB candidates / time positions / indexes within a specific time period may be smaller than in existing specifications. In other words, the number of bits for reporting SSB indexes may be smaller than in existing specifications. The specific time period may be a half frame, or a narrowband SSB transmission period.

[0118] According to the fifth embodiment described above, the initial access procedure using only narrowband SSB can be properly performed.

[0119] <Supplementary Information> [Notification of Information to UE] In the above-described embodiments, any information may be notified 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) 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.

[0120] 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.

[0121] 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.

[0122] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0123] [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.

[0124] 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.

[0125] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0126] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0127] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling.

[0128] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0129] The specific UE capability may indicate at least one of the following: - Supporting specific processing / operation / control / information for at least one of the above embodiments, - Supporting wideband SSB, - Supporting only narrowband SSB, - Maximum bandwidth (maximum channel bandwidth), e.g., maximum bandwidth per FR.

[0130] 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 a cell, a band, a band combination, a BWP, a 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).

[0131] 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)).

[0132] Furthermore, at least one of the above-described embodiments may be applied when the UE configures / activates / triggers specific information related to the above-described embodiment (or performs the operations of the above-described embodiment) through higher layer signaling / physical layer signaling. For example, the specific information may be any RRC parameter for a specific release (e.g., Rel. 18 / 19), etc.

[0133] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0134] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. [Supplementary Note 1] A terminal having: a receiver that receives at least a first synchronization signal block out of a first synchronization signal block transmitted in a first band and a second synchronization signal block transmitted in a second band wider than the first band; and a controller that controls an initial access procedure based on at least the first synchronization signal block. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the receiver receives the second synchronization signal block in a resource determined based on the first synchronization signal block. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the receiver receives the first synchronization signal block on a raster common to the first synchronization signal block and the second synchronization signal block. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the controller detects a sequence spanning the first synchronization signal block and the second synchronization signal block.

[0135] (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.

[0136] 7 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).

[0137] 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.

[0138] 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.

[0139] 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))).

[0140] 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 locations and numbers of the cells and user terminals 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 base station 10.

[0141] 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).

[0142] 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.

[0143] 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.

[0144] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 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.

[0145] 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.

[0146] 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.

[0147] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0148] 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).

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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).

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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).

[0162] (Base Station) Fig. 8 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.

[0163] 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.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] In addition, the transceiver unit 120 may transmit a first synchronization signal block (e.g., narrowband SSB) in a first band and transmit a second synchronization signal block (e.g., wideband SSB) in a second band that is wider than the first band.

[0180] The control unit 110 may control the initial access procedure based on at least the first synchronization signal block.

[0181] (User Terminal) Fig. 9 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] In addition, the transceiver unit 220 may receive at least the first synchronization signal block out of a first synchronization signal block (e.g., narrowband SSB) transmitted in a first band and a second synchronization signal block (e.g., wideband SSB) transmitted in a second band wider than the first band.

[0200] The control unit 210 may control the initial access procedure based on at least the first synchronization signal block.

[0201] The transceiver 220 may receive the secondary synchronization signal block in a resource determined based on the primary synchronization signal block.

[0202] The transceiver 220 may receive the first synchronization signal block on a raster common to the first synchronization signal block and the second synchronization signal block (for example, a common synchronization raster).

[0203] The control unit 210 may detect a sequence spanning the first synchronization signal block and the second synchronization signal block. The sequence may be obtained by combining a sequence of a synchronization signal (e.g., PSS / SSS) of the first synchronization signal block and a sequence of a synchronization signal (e.g., PSS / SSS) of the second synchronization signal block.

[0204] (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.

[0205] 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.

[0206] 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. 10 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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).

[0216] 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.

[0217] 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.

[0218] (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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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."

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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).

[0245] 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).

[0246] 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).

[0247] 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.

[0248] 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.

[0249] 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).

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 11 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.

[0267] 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.

[0268] 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).

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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).

[0275] 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.

[0276] 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)).

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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).

[0283] 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."

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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...."

[0289] 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 ...." "does not expect ..." may be interchangeably read as "be not expected ...." 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" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0290] 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.

[0291] 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."

[0292] 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.

[0293] 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."

[0294] 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.

[0295] 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.

[0296] 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").

[0297] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0298] 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.

[0299] 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.

[0300] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal having a receiving unit that receives at least a first synchronization signal block transmitted in a first band and a second synchronization signal block transmitted in a second band that is wider than the first band, and a control unit that controls an initial access procedure based on at least the first synchronization signal block.

2. The terminal according to claim 1, wherein the receiving unit receives the second synchronization signal block in a resource determined based on the first synchronization signal block.

3. The terminal according to claim 1, wherein the receiving unit receives the first synchronization signal block on a raster common to the first synchronization signal block and the second synchronization signal block.

4. The terminal according to claim 1, wherein the control unit detects a sequence spanning the first synchronization signal block and the second synchronization signal block.

5. A wireless communication method for a terminal comprising the steps of: receiving at least a first synchronization signal block transmitted in a first band and a second synchronization signal block transmitted in a second band wider than the first band; and controlling an initial access procedure based on at least the first synchronization signal block.

6. A base station having: a transmitting unit that transmits a first synchronization signal block in a first band and a second synchronization signal block in a second band wider than the first band; and a control unit that controls an initial access procedure based on at least the first synchronization signal block.

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