Terminal, wireless communication method and base station

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit that receives a first synchronization signal in a first band; and a control unit that, when a notification indicating the existence of a second synchronization signal in a second band is received, simultaneously uses the first synchronization signal and the second synchronization signal for at least one of the synchronization, the reception quality measurement and the radio link quality monitoring. According to an aspect of the present disclosure, resources suitable for a capability can be appropriately used.

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) 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) are also being considered.

[0004] In existing LTE systems (e.g., 3GPP Rel. 8-14), a user equipment (UE) transmits uplink control information (UCI) using at least one of an UL data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (e.g., a Physical Uplink Control Channel (PUCCH)). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 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 Summary of the Invention [Problem to be solved by the invention]

[0006] In future wireless communication systems (e.g., Rel. 17 and later), it is expected that terminals compatible with various use cases such as IoT will be introduced.

[0007] However, it is unclear how UEs with different capabilities / categories use resources. If resources are not used appropriately, there is a risk of system performance degradation, such as a decrease in resource utilization efficiency.

[0008] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately use resources according to capabilities. [Means for solving the problem]

[0009] A terminal according to one embodiment of the present disclosure includes a receiver that receives a first synchronization signal in a first band, and a controller that, when a notification indicating the presence of a second synchronization signal in a second band is received, simultaneously uses the first synchronization signal and the second synchronization signal for at least one of synchronization, reception quality measurement, and radio link quality monitoring. The primary synchronization signal and the secondary synchronization signal are transmitted within the same cell, and the same spatial domain filter and the same period are applied. . [Effects of the Invention]

[0010] According to one aspect of the present disclosure, resources can be used appropriately according to capabilities. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of a wireless communication system in which multiple types of UEs coexist. [Figure 2] FIG. 2 is a diagram showing an example of a baseline channel and an additional channel. [Figure 3] FIG. 3 is a diagram showing a baseline channel and a number of additional channels. [Figure 4] FIG. 4 is a diagram showing an example of the correspondence relationship between B-SS and A-SS. [Figure 5] FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Traffic type / service> In future wireless communication systems (e.g., NR), traffic types (also referred to as services, service types, communication types, use cases, etc.) such as further advances in mobile broadband (e.g., enhanced Mobile Broadband (eMBB)), machine-type communications that enable multiple simultaneous connections (e.g., massive Machine Type Communications (mMTC), Internet of Things (IoT)), and highly reliable and low-latency communications (e.g., Ultra-Reliable and Low-Latency Communications (URLLC)) are expected. For example, URLLC requires lower latency and higher reliability than eMBB.

[0013] Traffic types may be identified at the physical layer based on at least one of the following: ·Priority Logical channels with different priorities Modulation and Coding Scheme (MCS) table (MCS index table) Channel Quality Indication (CQI) table DCI format Used to scramble (mask) the Cyclic Redundancy Check (CRC) bits included (added) in the DCI (DCI format) (RNTI: System Information-Radio Network Temporary Identifier) RRC (Radio Resource Control) parameters A specific RNTI (e.g., RNTI for URLLC, MCS-C-RNTI, etc.) Search Space Fields within the DCI (e.g., newly added fields or reuse of existing fields, priority fields)

[0014] Specifically, the traffic type of the HARQ-ACK for the PDSCH may be determined based on at least one of the following: The MCS index table used to determine at least one of the modulation order, target code rate, and transport block size (TBS) of the PDSCH (for example, whether to use MCS index table 3). The RNTI used for CRC scrambling of the DCI used for scheduling the PDSCH (for example, whether CRC scrambling is performed using C-RNTI or MCS-C-RNTI)

[0015] The traffic type of the SR may also be determined based on a higher layer parameter used as an SR identifier (SR-ID), which may indicate whether the traffic type of the SR is eMBB or URLLC.

[0016] Furthermore, the traffic type of the CSI may be determined based on configuration information (CSIreportSetting) related to CSI reporting, a DCI type or DCI transmission parameters used for triggering, etc. The configuration information, DCI type, etc. may indicate whether the traffic type of the CSI is eMBB or URLLC. The configuration information may also be higher layer parameters.

[0017] In addition, the traffic type of the PUSCH may be determined based on at least one of the following: The MCS index table used to determine at least one of the modulation order, target coding rate, and TBS of the PUSCH (e.g., whether to use MCS index table 3) The RNTI used for CRC scrambling of the DCI used for scheduling the PUSCH (for example, whether CRC scrambling is performed using C-RNTI or MCS-C-RNTI)

[0018] The traffic type may be associated with communication requirements (requirements such as delay, error rate, etc.), data type (voice, data, etc.), and the like.

[0019] The difference between the requirements of URLLC and eMBB may be that the latency of URLLC is smaller than that of eMBB, or that the requirements of URLLC include a reliability requirement.

[0020] For example, the eMBB user (U) plane delay requirement may include a downlink U-plane delay of 4 ms and an uplink U-plane delay of 4 ms. On the other hand, the URLLC U-plane delay requirement may include a downlink U-plane delay of 0.5 ms and an uplink U-plane delay of 0.5 ms. Furthermore, the URLLC reliability requirement may include a 32-byte error rate of 10 ms for a 1 ms U-plane delay. -5 It may include that:

[0021] Additionally, enhanced Ultra Reliable and Low Latency Communications (eURLLC) is being studied to improve the reliability of traffic, mainly for unicast data. In the following, when there is no need to distinguish between URLLC and eURLLC, they will simply be referred to as URLLC.

[0022] In NR Rel. 16 and later, the setting of multiple levels (e.g., two levels) of priority for specific signals or channels is being considered. For example, it is expected that different priorities will be set for signals or channels corresponding to different traffic types (also known as services, service types, communication types, use cases, etc.) to control communications (e.g., transmission control in the event of collisions). This will make it possible to control communications by setting different priorities for the same signal or channel depending on the service type, etc.

[0023] The priority of URLLC may be higher than the priority of eMBB. The priority may be set to "high" (high priority, 1) for URLLC and "low" (low priority, 0) for eMBB.

[0024] <Analysis> Future wireless communication systems / networks (e.g., 6G) are expected to support a wider variety of use cases / devices than 5G NR in order to further improve communication speed, capacity, reliability, latency performance, and multiple connections, as well as to expand into new areas such as sensing.

[0025] In LTE and NR, functions that have been reduced from the mandatory functions supported by existing terminals are defined as UE categories / capabilities for the Internet of Things (IoT). Examples of such UE categories / capabilities include enhanced machine type communication (eMTC) in LTE, narrowband (NB)-IoT, and reduced capability (RedCap) in NR. However, additional functions are required to compensate for the performance degradation caused by the reduced functionality.

[0026] As shown in the example of Figure 1, existing UEs that communicate over a wide bandwidth and for a short period of time may coexist with IoT UEs that use narrower bandwidths, longer periods of time, and repetition, and sensing UEs that use narrower bandwidths and smaller amounts of information.

[0027] In future wireless communication systems, if functions are added for each use case / terminal, it may become difficult to efficiently coexist with existing UEs.

[0028] Therefore, the present inventors came up with the idea of ​​a method of using appropriate resources for transmission and reception depending on the use case / terminal.

[0029] Hereinafter, embodiments of 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.

[0030] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0031] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0032] 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, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), RRC messages, and settings may be read interchangeably.

[0033] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. In the present disclosure, the MAC CE, an update command, and an activation / deactivation command may be read interchangeably.

[0034] The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI, SIB1), Other System Information (OSI), etc.

[0035] In this disclosure, the terms beam, spatial-domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial-domain receive filter, UE spatial-domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS for QCL type D in TCI state / QCL assumption, RS for QCL type A in TCI state / QCL assumption, spatial relationship, spatial-domain transmit filter, UE spatial-domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be interchangeable. In this disclosure, the terms QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be interchangeable.

[0036] In the present disclosure, the terms panel, uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, antenna port of a certain signal (e.g., demodulation reference signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., code division multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (multi-input multi-output (MIMO) layer, transmission layer, spatial layer) may be interchangeable. Also, panel identifier (ID) and panel may be interchangeable. In the present disclosure, TRP ID and TRP may be interchangeable.

[0037] In the present disclosure, the waveform, whether discrete Fourier transform (DFT)-spread (S)-OFDM in which CP-OFDM is used, and whether transform precoding is disabled or enabled may be read interchangeably.

[0038] The following abbreviations may be used in this disclosure: ·time division multiplexing (TDM) ·Frequency division multiplexing (FDM) ·code division multiplexing(CDM) Subcarrier spacing (SCS) Cyclic prefix (CP) ·radio network temporary identifier(RNTI) ·modulation and coding scheme(MCS) Transport block size (TBS) Wake up signal (WUS) Radio link monitoring (RLM) ·radio resource management(RRM) Cell-specific RS (CRS) Tracking RS (TRS)

[0039] In the present disclosure, capabilities, categories, types, UEs, traffic types, services, service types, communication types, and use cases may be interchangeable.

[0040] In the present disclosure, notification, configuration, parameter, RRC information element, and MAC CE may be read interchangeably.

[0041] In this disclosure, measuring, calculating, monitoring, and reporting may be read interchangeably.

[0042] (Wireless communication method) One or more baseline channels may be defined / configured. One or more additional channels may be defined / configured / activated.

[0043] In the present disclosure, channel, band, carrier, component carrier, bandwidth part (BWP), partial band, band, resource, resource set, block, signal block, one or more RBs, one or more REs, period, window, and RB set may be interpreted as interchangeable.

[0044] In this disclosure, baseline, primary, first, fallback, base, default, #0, and index 0 may be interchangeable. In this disclosure, additional, secondary, second, non-fallback, supplementary, enhanced, a number equal to or greater than a specific value (e.g., 1), and an index equal to or greater than a specific value (e.g., 1) may be interchangeable.

[0045] One or more additional channels may be FDM / TDM / CDMed to the baseline channel.

[0046] A specific type of signal in the baseline channel may be called a baseline signal, and a specific type of signal in the additional channel may be called an additional signal.

[0047] In the present disclosure, RLM, radio link quality measurement, link recovery procedure, beam failure detection, beam recovery procedure, and candidate beam detection may be read interchangeably.

[0048] First Embodiment Baseline Channel A UE may transmit / receive (transmit / receive, UL / DL) on a baseline channel in the absence of a specific configuration / notification (parameter, information element) from a network (NW, for example, a base station).

[0049] UEs of any category / capability (both UEs with and without specific capabilities) may be able to transmit and receive on (or may support) the baseline channel. Any category / capability may include eMBB, URLLC, and IoT.

[0050] Parameters related to transmission and reception in the baseline channel (baseline channel resources (e.g., frequency, bandwidth, band, start timing, duration, period)) may be determined according to at least one of the following determination methods 1 and 2.

[0051] [Decision method 1] The parameters for transmission and reception in the baseline channel may be defined by a specification.

[0052] [Decision method 2] The parameters related to transmission and reception in the baseline channel may be set by the NW. The parameters (setting information) related to transmission and reception in the baseline channel may follow at least one of the following setting methods 1 and 2.

[0053] [[Setting Method 1]] Parameters related to transmission and reception in the baseline channel may be set commonly for cells as system information.

[0054] [[Setting Method 2]] Parameters related to transmission and reception on the baseline channel may be set individually (specifically) for each UE by higher layer signaling.

[0055] The setting information regarding the baseline channel may include at least one of the following setting information 1 and 2.

[0056] [Setting information 1] The configuration information regarding the baseline channel includes configuration information related to transmission of an UL signal / UL channel in the baseline channel. The UL signal / UL channel may be a signal / channel used for at least one of initial access (random access), control, data, positioning (location estimation), detection, synchronization (time / frequency synchronization), demodulation, measurement (reception quality measurement, radio link monitoring), channel estimation, and discovery, or may be a reference signal.

[0057] The configuration information regarding transmission of the UL signal / UL channel may include at least one of the following: SCS, CP length, waveform, time / frequency / code resources for transmission, transmission signal sequence, RNTI, transmission power, precoding, antenna port, repetition, frequency hopping, MCS, and TBS.

[0058] [Setting information 2] The configuration information regarding the baseline channel includes configuration information related to reception of DL signals / DL channels in the baseline channel. The DL signals / DL channels may be signals / channels used for at least one of synchronization (synchronization signal), broadcast (MIB / SIB, paging / WUS), initial access (random access), connection management (RLM / RRM), time / frequency synchronization (CRS / TRS), control, data, positioning (location estimation), detection, demodulation, measurement (reception quality measurement, radio link quality measurement), channel estimation, and discovery, or may be reference signals.

[0059] The configuration information regarding reception of DL signals / DL channels may include at least one of SCS, CP length, waveform, time / frequency / code resources for reception, received signal sequence, RNTI, transmit power, precoding, antenna port, repetition, frequency hopping, MCS, and TBS.

[0060] The range in which the base channel is set / defined may be in accordance with at least one of the following ranges 1 to 3:

[0061] [Range 1] The base channel is configured / defined only to the cell to which the UE makes initial access (random access), which may be a PCell / PSCell.

[0062] [Range 2] The base channel is configured / defined for any cell, which may be a PCell / PSCell / SCell.

[0063] [Range 3] The base channel is set / defined only for a specific cell. The specific cell may be a cell within a specific frequency range (FR) / band, or may be a cell using a specific duplex mode. For example, the specific cell may be an FDD cell within FR1. The specific cell may be a cell with coverage greater than that of other cells (e.g., TDD cells). The specific frequency range may be a frequency range (e.g., FR1) below a specific frequency (e.g., 6 GHz, 24.25 GHz, or 52.6 GHz).

[0064] According to this embodiment, the UE can properly transmit and receive using the baseline channel.

[0065] <Second embodiment> Additional Channel The UE may transmit / receive (transmit / receive, UL / DL) in one or more additional channels if there is a specific configuration / notification from the network. The UE may transmit / receive in the baseline channel and additional channels if there is a specific configuration / notification from the network. The UE may receive a specific configuration / notification in the baseline channel.

[0066] A UE of a specific category / capability (only a UE with a specific capability) may be able to transmit and receive in one or more additional channels (may support transmission and reception in one or more additional channels). The specific category / capability may include eMBB, URLLC. A specific UE may report a specific capability. A specific UE may report a specific capability in a baseline channel. When the NW receives a report of a specific capability from a UE, it may send a specific configuration / notification to the UE.

[0067] If a UE reports specific capabilities, it may transmit / receive (UL / DL) on one or more additional channels. If a UE reports specific capabilities, it may transmit / receive on the baseline channel and the additional channels.

[0068] The UE may transmit and receive on the baseline channel and the additional channel unless there is a specific setting / notification from the NW.

[0069] Parameters related to transmission and reception in one or more additional channels (resources of one or more additional channels (e.g., frequency, bandwidth, band, start timing, duration, period)) may be determined according to at least one of the following determination methods 1 and 2.

[0070] [Decision method 1] The parameters for transmission and reception in the additional channel may be defined by specifications.

[0071] [Decision method 2] The parameters related to transmission and reception in the additional channel may be set by the NW. The parameters (setting information) related to transmission and reception in the additional channel may follow at least one of the following setting methods 1 and 2.

[0072] [[Setting Method 1]] Parameters related to transmission and reception in the additional channel may be set commonly for the cells as system information.

[0073] [[Setting Method 2]] Parameters related to transmission and reception in the additional channel may be set individually (specifically) for each UE by higher layer signaling.

[0074] The setting information regarding the additional channel may include at least one of the following setting information 1 and 2.

[0075] [Setting information 1] The configuration information regarding the additional channel includes configuration information regarding transmission of an UL signal / UL channel in the additional channel. The UL signal / UL channel may be a signal / channel used for at least one of initial access (random access), control, data, positioning, and measurement, or may be a reference signal.

[0076] The configuration information regarding transmission of the UL signal / UL channel may include at least one of the following: SCS, CP length, waveform, time / frequency / code resources for transmission, transmission signal sequence, RNTI, transmission power, precoding, antenna port, repetition, frequency hopping, MCS, and TBS.

[0077] [Setting information 2] The configuration information regarding the additional channel includes configuration information related to reception of a DL signal / DL channel in the additional channel. The DL signal / DL channel may be a signal / channel used for at least one of synchronization (synchronization signal), broadcast (MIB / SIB, paging / WUS), initial access (random access), connection management (RLM / RRM), time / frequency synchronization (CRS / TRS), control, data, positioning, measurement, discovery, and detection, or may be a reference signal.

[0078] The configuration information regarding reception of DL signals / DL channels may include at least one of SCS, CP length, waveform, time / frequency / code resources for reception, received signal sequence, RNTI, transmit power, precoding, antenna port, repetition, frequency hopping, MCS, and TBS.

[0079] The range in which the additional channel is set / defined may comply with at least one of the following ranges 1 to 3.

[0080] [Range 1] The additional channel is set / defined only in a cell in which a baseline channel is set or in a cell in which a baseline channel is not set.

[0081] [Range 2] The additional channel is configured / defined for an arbitrary cell, which may be a PCell / PSCell / SCell.

[0082] [Range 3] The additional channel is configured / defined only for a specific cell. The specific cell may be a cell within a specific frequency range (FR) / band, or may be a cell using a specific duplex mode. For example, the specific cell may be a TDD cell within FR1 / 2 / x, or a cell within FR2 / x. FRx may be a frequency range higher than FR2. The specific cell may have a bandwidth wider than that of other cells (e.g., FDD cells). The specific frequency range may be a frequency range (e.g., FR2 / x) equal to or higher than a specific frequency (e.g., 6 GHz, 24.25 GHz, or 52.6 GHz).

[0083] The UE may use at least one of the baseline channel and the additional channel to perform at least one of signal detection, time / frequency synchronization, demodulation, measurements (reception quality measurement / radio link quality measurement), channel estimation, location estimation, DL signal / DL channel reception, UL signal / UL channel transmission, and reference signal transmission.The UE may use both the baseline channel and the additional channel to perform at least one of signal detection, time / frequency synchronization, demodulation, measurements (reception quality measurement / radio link quality measurement), channel estimation, location estimation, DL signal / DL channel reception, UL signal / UL channel transmission, and reference signal transmission.

[0084] A particular UL signal / UL channel may span both the baseline channel and the additional channel, and a particular DL signal / DL channel may span both the baseline channel and the additional channel.

[0085] Any UE may be capable of (or may support) transmission / reception in the baseline channel, and certain (or some) UEs may be capable of (or may support) transmission / reception in the additional channel. The additional channel may be optimized for certain UEs / supports. The UE may maintain a connection using the baseline channel and utilize additional resources in the additional channel.

[0086] In the example of Figure 2, the UE may perform at least one of the following on the baseline channel: receiving an SSB, transmitting a RACH, receiving Msg2, transmitting Msg3, receiving Msg4, receiving a subsequent PDCCH, and transmitting a PUSCH / receiving a PDSCH scheduled by the PDCCH.The UE may perform at least one of the following on the additional channel: receiving an SSB, transmitting a RACH, receiving a subsequent PDCCH, and transmitting a PUSCH / receiving a PDSCH scheduled by the PDCCH.

[0087] In the example of Figure 3, the UE may perform at least one of the following on the baseline channel: receiving an SSB, transmitting a RACH, receiving Msg2, transmitting Msg3, receiving Msg4, receiving a subsequent PDCCH, and transmitting a PUSCH / receiving a PDSCH scheduled by the PDCCH.The UE may perform at least one of the following on additional channels #1 / #2: receiving an SSB, transmitting a RACH, receiving a subsequent PDCCH, and transmitting a PUSCH / receiving a PDSCH scheduled by the PDCCH.

[0088] The UE may perform at least one of synchronization, notification (MIB), initial access (random access), connection management (RLM / RRM), positioning, measurement, discovery, and detection using a combination of SSBs in the baseline channel and SSBs in one or more additional channels. The UE may perform random access using a combination of RACHs in the baseline channel and RACHs in one or more additional channels. The UE may receive / monitor PDCCHs (DCI) using a combination of PDCCHs (resources, PDCCH candidates, CORESET) in the baseline channel and PDCCHs (resources, PDCCH candidates, CORESET) in one or more additional channels. The UE may receive DL data (DL-SCH, TB) using a combination of PDSCHs in the baseline channel and PDSCHs in one or more additional channels. The UE may transmit UL data (UL-SCH, TB) using a combination of PUSCHs in the baseline channel and PUSCHs in one or more additional channels.

[0089] A UE may maintain an RRC connection using a baseline channel, and UEs with certain categories / capabilities may use one or more additional channels as additional resources to the baseline channel.

[0090] The size of a particular type of channel / information / resource / payload in the Additional Channel may be larger than the size of a particular type of channel / information / resource / payload in the Baseline Channel. The information carried by a particular type of channel in the Additional Channel may include fields that are not present in the information carried by a particular type of channel in the Baseline Channel.

[0091] The cell / CC in which the additional channel resides may be different from the cell / CC in which the baseline channel resides. The time resources of the additional channel may be different from, or may overlap in whole or in part with, the time resources of the baseline channel.

[0092] The cell / CC in which the additional channel resides may be the same as the cell / CC in which the baseline channel resides. The frequency resources of the additional channel (e.g., BWP) may be different from or may overlap fully or partially with the frequency resources of the baseline channel within that cell. The time resources of the additional channel may be different from or may overlap fully or partially with the time resources of the baseline channel.

[0093] The UE may perform the initial access / RRC connection procedure using only the baseline channel, or may perform the initial access / RRC connection procedure using the baseline channel and the additional channel.

[0094] The beams (spatial domain filters) used for a particular type of channel / signal in the additional channels may be the same as or different from the beams (spatial domain filters) used for a particular type of channel / signal in the baseline channel. The baseline channel and one or more additional channels may be associated with the same TRP or different TRPs.

[0095] According to this embodiment, the UE can appropriately perform transmission and reception using the additional channel.

[0096] By using the baseline channel and the additional channel, the UE can achieve higher quality / efficiency than when using only the baseline channel.

[0097] The bandwidth of the additional channel may be wider than the bandwidth of the baseline channel, and by using the additional channel, the UE can achieve higher quality / efficiency than by using the baseline channel.

[0098] <Third embodiment> 《Synchronization signal》 The UE may receive a baseline-synchronization signal (B-SS) on a baseline channel for cell search.

[0099] A B-SS may consist of multiple signals (e.g., multiple synchronization signals). The multiple signals may each have multiple sequences that are different from one another. The multiple signals may be TDM / FDM / CDM. For example, the multiple signals may include a primary SS (PSS) and a secondary SS (SSS).

[0100] The start timing of a B-SS (frame / half frame / subframe / one or more slots / symbol, position of the start symbol for each one or more slots) may be determined based on the SCS of the B-SS.

[0101] The B-SS may be TDM / FDM / CDM-based on at least one of a channel that conveys (carries) a specific parameter and an RS for demodulating the channel. For example, the channel / RS may be a PBCH, a DMRS for the PBCH, or a CRS.

[0102] UEs of any type / capability may receive (or support) B-SS.

[0103] <<Aspect 3-1>> A UE may receive an additional-synchronization signal (A-SS) if it receives an indication indicating the presence of A-SS in the additional channel. UEs with certain categories / capabilities may attempt to receive A-SS.

[0104] The notification indicating the existence of the A-SS may be notified by at least one signal / channel of the B-SS and a channel TDM / FDM / CDM-connected to the B-SS, or by a signal / channel other than the B-SS in the baseline channel (first band), or by a signal / channel in an additional channel (third band) other than the A-SS in the additional channel (second band). The notification may indicate the time / frequency / code resources of the A-SS.

[0105] 3, a notification indicating the presence of an A-SS in additional channel #1 may be transmitted in the baseline channel by at least one signal / channel of the B-SS, a channel TDM / FDM / CDMed to the B-SS, and others. A notification indicating the presence of an A-SS in additional channel #2 may be transmitted by at least one signal / channel of the baseline channel and additional channel #1.

[0106] The A-SS may be composed of multiple signals (e.g., multiple synchronization signals). The multiple signals may each have multiple sequences that are different from one another. The multiple signals may be TDM / FDM / CDM. For example, the multiple signals may include a primary SS (PSS) and a secondary SS (SSS).

[0107] The start timing of the A-SS (frame / half frame / subframe / one or more slots / symbol, position of the start symbol for each one or more slots) may be set by the network, may be determined based on a notification indicating the existence of the A-SS, or may be determined based on the SCS of that A-SS.

[0108] The A-SS may be TDM / FDM / CDM-based for at least one of a channel that conveys (carries) a specific parameter and an RS for demodulating the channel. For example, the channel / RS may be a PBCH, a DMRS for the PBCH, or a CRS.

[0109] UEs of a particular type / capability may be able to receive (may support) A-SS.

[0110] The A-SS may be TDM / FDM / CDM transmitted to the B-SS in the same cell as the B-SS, or may be transmitted in a different cell from the B-SS.

[0111] <<Aspect 3-1-1>> If the B-SS and A-SS have a specific correspondence (relationship), the UE may assume that the B-SS and A-SS are transmitted using the same transmit beam (spatial domain filter).

[0112] The specific correspondence between B-SS and A-SS may follow at least one of the following correspondences 1 and 2.

[0113] [Correspondence 1] The specific correspondence between the B-SS and the A-SS may be signaled by at least one signal / channel between the B-SS and the channel TDM / FDM / CDMed to the B-SS, or may be signaled by a signal / channel other than that signal / channel in the baseline channel, or may be signaled by a signal / channel in an additional channel other than the additional channel having that A-SS.

[0114] [Correspondence 2] The B-SS and the A-SS having a specific correspondence relationship may be that the B-SS and the A-SS overlap in the time domain (that the B-SS and the A-SS are FDM / CDM). The B-SS and the A-SS having a specific correspondence relationship may be that the B-SS and the A-SS are in the same cell / frequency band / frequency range (e.g., FR1, FR2) and overlap in the time domain.

[0115] In the example of Figure 4, B-SS is transmitted on the baseline channel, and A-SS#1 and #2 are transmitted on the additional channel. A-SS#2 overlaps with B-SS in the time domain, so A-SS#1 has a specific correspondence relationship with B-SS. A-SS#2 does not overlap with B-SS in the time domain, so A-SS#2 does not have a specific correspondence relationship with B-SS.

[0116] <<Aspect 3-1-2>> The UE may assume that the transmission period of the B-SS and the transmission period of the A-SS are the same, or may assume that the transmission period of the B-SS and the transmission period of the A-SS are different.

[0117] For a B-SS and an A-SS that have a particular correspondence, the UE may assume that the transmission period of the B-SS and the transmission period of the A-SS are the same.

[0118] <<Aspect 3-1-3>> The signal sequence of the A-SS may be based on the signal sequence of the B-SS.

[0119] The signaling sequence of an A-SS may be based on the signaling sequence of a B-SS that has a specific correspondence to the A-SS.

[0120] According to this embodiment, the UE can perform synchronization / measurement appropriately depending on its capabilities.

[0121] <Fourth embodiment> RRM The UE may measure (calculate) reception quality using at least one of the B-SS and A-SS, and report the reception quality to the NW. The reception quality may be RSRP / RSRQ / RSSI / SINR.

[0122] The UE may be configured / instructed by the NW to report reception quality. The UE may also decide to report reception quality without being configured / instructed. The time domain operation of measuring / reporting reception quality may be periodic / semi-persistent / non-periodic.

[0123] A UE that receives only the B-SS may use the B-SS to calculate reception quality and may report its reception quality using the UL channel / UL signal in the baseline channel.

[0124] A UE that receives the A-SS may calculate reception quality using the A-SS. The UE may report the reception quality using a UL channel / UL signal in the additional channel. A UE that receives the A-SS may calculate reception quality using at least one SS of the B-SS and the A-SS. The UE may report the reception quality using a UL channel / UL signal in at least one channel of the baseline channel and the additional channel.

[0125] A UE that receives a B-SS and an A-SS with a specific correspondence may follow at least one of the following calculation / reporting methods 1 to 4.

[0126] [Calculation / Reporting Method 1] The UE may calculate reception quality using the B-SS, and may report its reception quality using the UL channel / UL signal in the baseline channel.

[0127] [Calculation / Reporting Method 2] The UE may calculate reception quality using A-SS, and may report the reception quality using the UL channel / UL signal in the additional channel.

[0128] [Calculation / Reporting Method 3] A UE may calculate reception quality using the B-SS and A-SS, and may report the reception quality using UL channels / UL signals in the baseline channel, or may report the reception quality using UL channels / UL signals in the additional channel, or may report the reception quality using UL channels / UL signals across both the baseline channel and the additional channel.

[0129] [Calculation / Reporting Method 4] Which of calculation / reporting methods 1 to 3 the UE performs may be defined in a specification, may be configured / instructed, or may be determined by the UE.

[0130] According to this embodiment, the UE can appropriately perform measurements / reports for RRM according to its capabilities.

[0131] <Fifth embodiment> RLM The UE may monitor (measure / calculate / RLM) radio link quality using at least one of the B-SS and A-SS. The radio link quality may be RSRP / RSRQ / RSSI / SINR.

[0132] The UE may be configured / instructed by the NW to monitor the radio link quality. The UE may also decide to monitor the radio link quality without being configured / instructed. The time domain operation of the radio link quality monitoring may be periodic / semi-persistent / aperiodic.

[0133] A UE that receives only the B-SS may use the B-SS to monitor the radio link quality.

[0134] A UE that receives the A-SS may monitor radio link quality using the A-SS. A UE that receives the A-SS may monitor radio link quality using at least one of the B-SS and the A-SS.

[0135] A UE that receives a B-SS and an A-SS having a specific correspondence relationship may follow at least one of the following monitoring methods 1 to 4.

[0136] [Monitoring method 1] The UE may use the B-SS to monitor the radio link quality.

[0137] [Monitoring method 2] The UE may use A-SS to monitor the radio link quality.

[0138] [Monitoring method 3] The UE may monitor the radio link quality using the B-SS and A-SS.

[0139] [Monitoring method 4] The operation of the UE in monitoring methods 1 to 3 may be defined in a specification, may be configured / instructed, or may be determined by the UE itself.

[0140] The UE may monitor the radio link quality of only the PCell / PSCell, or may monitor the radio link quality of the PCell / PSCell / SCell.

[0141] The UE may follow at least one of the following determination methods 1 and 2.

[0142] [Judgment method 1] If the radio link quality is lower than a threshold Q_out (worse than the threshold Q_out or equal to or less than the threshold Q_out), the UE may notify an alert (e.g., an out-of-sync state) to a higher layer. Q_out may be specified in a specification, may be set / instructed by the NW, or may be determined by the UE.

[0143] At least two of Q_out when B-SS is used, Q_out when A-SS is used, and Q_out when B-SS and A-SS are used may be the same. At least two of Q_out when B-SS is used, Q_out when A-SS is used, and Q_out when B-SS and A-SS are used may be different.

[0144] [Judgment method 2] If the radio link quality is equal to or greater than the threshold Q_in (better than the threshold Q_in, or the same as the threshold Q_in, or greater than the threshold Q_in), the UE may not notify the upper layer of an alert, or may notify the upper layer of the absence of an alert (for example, an in-sync state). Q_in may be specified in a specification, may be set / instructed by the NW, or may be determined by the UE.

[0145] At least two of Q_in when using B-SS, Q_in when using A-SS, and Q_in when using B-SS and A-SS may be the same. At least two of Q_in when using B-SS, Q_in when using A-SS, and Q_in when using B-SS and A-SS may be different.

[0146] According to this embodiment, the UE can appropriately perform measurements / reports for RRM according to its capabilities.

[0147] (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.

[0148] 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication 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).

[0149] 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.

[0150] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the 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.

[0151] 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 the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0152] 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.

[0153] 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 (CC) and dual connectivity (DC).

[0154] 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 above 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 be a frequency band higher than FR2.

[0155] 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.

[0156] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0157] 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.

[0158] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0159] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio 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).

[0160] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0161] 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.

[0162] 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)), etc. may be used as an uplink channel.

[0163] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0164] 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.

[0165] 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 an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0166] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search 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 a CORESET associated with a certain search space based on the search space configuration.

[0167] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0168] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement 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.

[0169] 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.

[0170] 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, 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 as DL-RS.

[0171] 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 the SS (PSS, SSS) and the PBCH (and 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 reference signals.

[0172] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. 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).

[0173] (base station) 6 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.

[0174] 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.

[0175] 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.

[0176] 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 to be transmitted as signals, control information, sequences, etc., 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.

[0177] 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.

[0178] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0179] 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 pertains, such as an array antenna.

[0180] 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.

[0181] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0182] The transceiver 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.

[0183] The transceiver 120 (transmission processor 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.

[0184] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0185] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0186] 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.

[0187] 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.

[0188] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0189] 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.

[0190] The transceiver 120 may transmit information about the second band within the first band. The controller 110 may simultaneously use a first signal within the first band and a second signal within the second band for at least one of synchronization, measurement, channel estimation, position estimation, and reference signal transmission.

[0191] The transceiver 120 may transmit a first synchronization signal in a first band, transmit a notification indicating the presence of a second synchronization signal in a second band, and transmit the second synchronization signal. The controller 110 may configure at least one of synchronization, reception quality measurement, and radio link quality monitoring in the terminal. The first synchronization signal and the second synchronization signal may be used simultaneously for at least one of the synchronization, reception quality measurement, and radio link quality monitoring.

[0192] (user terminal) 7 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.

[0193] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, 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.

[0194] 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, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0195] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also 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.

[0196] 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 from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0197] The transmitting / receiving unit 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.

[0198] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0199] 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.

[0200] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0201] The transceiver 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.

[0202] The transceiver 220 (transmission processor 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.

[0203] 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 when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0204] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0205] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0206] The transceiver 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 to acquire user data, etc.

[0207] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0208] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0209] The transceiver 220 may receive information about a second band (e.g., an additional channel) in a first band (e.g., a baseline channel). The controller 210 may simultaneously use a first signal in the first band and a second signal in the second band for at least one of synchronization, measurement, channel estimation, position estimation, and reference signal transmission.

[0210] The first band may be set for at least one of a cell where initial access is performed, a cell within a specific frequency range, and a cell of a specific duplex mode.

[0211] The second band may be set for at least one of a cell in which the first band is set, a cell in which the first band is not set, a cell within a specific frequency range, and a cell of a specific duplex mode.

[0212] The control unit 210 may report capabilities regarding the second band within the first band.

[0213] The transceiver 220 may receive a first synchronization signal (e.g., B-SS) in a first band. When a notification indicating the presence of a second synchronization signal (e.g., A-SS) in a second band is received, the controller 210 may simultaneously use the first synchronization signal and the second synchronization signal for at least one of synchronization, reception quality measurement, and radio link quality monitoring.

[0214] The transceiver 220 may receive the notification in the first band or the third band.

[0215] The first synchronization signal and the second synchronization signal may be transmitted within the same cell or may be transmitted in different cells.

[0216] When the first synchronization signal and the second synchronization signal have a specific relationship, at least one of the same spatial domain filter, the same period, and the same sequence may be applied to the first synchronization signal and the second synchronization signal.

[0217] (Hardware configuration) 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 also be realized by combining the single device or multiple devices with software.

[0218] 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 mentioned above, the implementation method of each is not particularly limited.

[0219] For example, a base station, a user terminal, etc. 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. 8 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, etc.

[0220] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read 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.

[0221] 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.

[0222] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined 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.

[0223] 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), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0224] 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 realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0225] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0226] Storage 1003 is a computer-readable recording medium and may be constituted by 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, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0227] 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.

[0228] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0229] 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.

[0230] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0231] (Variation) Note that terms explained 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.

[0232] 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.

[0233] 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, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0234] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0235] 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.

[0236] 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.

[0237] 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 a subframe and a 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.

[0238] 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. However, the definition of TTI is not limited to this.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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 equal to or greater than 1 ms.

[0243] 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 also be determined based on numerology.

[0244] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0245] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0246] 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.

[0247] A Bandwidth Part (BWP), which may also be referred to as a fractional 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 given BWP and numbered within that BWP.

[0248] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0249] 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."

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0257] Note that the physical layer signaling may be called 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 called 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).

[0258] 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).

[0259] 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).

[0260] 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.

[0261] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0262] 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).

[0263] In the present 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," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0264] In this 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.

[0265] 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 divided 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 term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0266] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0267] 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.

[0268] 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. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. 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). 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.

[0269] 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 uplink channel and downlink channel may be read as sidelink channel.

[0270] 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.

[0271] 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) and a Serving-Gateway (S-GW)), or a combination thereof.

[0272] 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 specific order presented.

[0273] Each aspect / embodiment described in the present disclosure may be related to 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) (xG (x is, for example, an integer or a decimal)), 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 The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0274] 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."

[0275] 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.

[0276] 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.

[0277] 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.

[0278] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0279] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0280] 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.

[0281] 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."

[0282] 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.

[0283] 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."

[0284] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0285] 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.

[0286] 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 invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiving unit that receives a first synchronization signal in a first band; a control unit configured to simultaneously use the first synchronization signal and the second synchronization signal for at least one of synchronization, reception quality measurement, and radio link quality monitoring when a notification indicating the presence of a second synchronization signal in a second band is received; A terminal in which the primary synchronization signal and the secondary synchronization signal are transmitted in the same cell and to which the same spatial domain filter and the same period are applied.

2. The terminal according to claim 1 , wherein the receiving unit receives the notification in the first band or the third band.

3. receiving a first synchronization signal in a first band; when an indication of the presence of a secondary synchronization signal in a second band is received, simultaneously using the first synchronization signal and the second synchronization signal for at least one of synchronization, reception quality measurement, and radio link quality monitoring; A wireless communication method for a terminal, wherein the primary synchronization signal and the secondary synchronization signal are transmitted in the same cell, and the same spatial domain filter and the same period are applied to the primary synchronization signal and the secondary synchronization signal.

4. a transmitter configured to transmit a first synchronization signal in a first band, to transmit a notification indicating the presence of a second synchronization signal in a second band, and to transmit the second synchronization signal; a control unit that configures at least one of synchronization, reception quality measurement, and radio link quality monitoring in the terminal; the first synchronization signal and the second synchronization signal are simultaneously used for at least one of the synchronization, the reception quality measurement, and the radio link quality monitoring; A base station, wherein the primary synchronization signal and the secondary synchronization signal are transmitted within the same cell and are subjected to the same spatial domain filter and the same period.

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