Terminal, base station, wireless communication system, and wireless communication method

Abstract

This terminal comprises: a communication unit that executes communication with a duplex redundancy scheme cell capable of executing simultaneous communication of an uplink signal and a downlink signal in a time division duplex band; and a control unit that, when a synchronization signal from an additional cell is configured in a subband of the uplink signal, executes an operation in the subband of the uplink signal subjected to the configuration.

Description

Terminal, base station, wireless communication system, and wireless communication method

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

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] For example, 3GPP Release 18 is considering an extension of the duplex method (Non-Patent Document 1). Specifically, SBFD (Sub-Band non-overlapping Full Duplex) is proposed as a new duplex method that enables simultaneous use of the downlink (DL) and uplink (UL) within a carrier in a time division duplex (TDD) band. SBFD may also be read as XDD (Cross Division Duplex).

[0004] "New SI: Study on evolution of NR duplex operation", RP-213591, 3GPP TSG RAN#94-e, 3GPP, December 2021

[0005] However, a case is assumed in which a synchronization signal (SSB; Synchronization Signal Block) from an additional cell may be configured in the UL subband for SBFD. In other words, a case is assumed in which the UL subband for SBFD may be configured in an SSB symbol from an additional cell.

[0006] Under these circumstances, the inventors have conducted extensive research and found that it is necessary to clarify whether an SBFD-aware UE performs UL transmission in an SSB symbol when considering a case where an SSB from an additional cell may be configured in the UL subband related to SBFD.

[0007] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a terminal, a base station, a wireless communication system, and a wireless communication method that can clarify the operation related to UL transmission when an SSB from an additional cell is configured in the UL subband related to SBFD.

[0008] The disclosed aspect is a terminal including: a communication unit that communicates with a duplex cell that can perform simultaneous communication of an uplink signal and a downlink signal within a time division duplex band; and a control unit that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, performs operation in the set subband of the uplink signal.

[0009] The disclosed aspect is a base station including: a communication unit that communicates with a terminal via a duplex cell that can perform simultaneous communication of an uplink signal and a downlink signal within a time division duplex band; and a control unit that assumes that, when a synchronization signal from an additional cell is set in a subband of the uplink signal, the terminal controls operation in the set subband of the uplink signal.

[0010] The disclosed aspect is a wireless communication system comprising a terminal and a base station, wherein the terminal comprises a communication unit that communicates with a duplex cell capable of performing simultaneous communication of an uplink signal and a downlink signal within a time division duplex band, and a control unit that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, performs operation in the set subband of the uplink signal.

[0011] The disclosed aspect is a wireless communication method comprising: step A of communicating with a duplex cell capable of performing simultaneous communication of an uplink signal and a downlink signal within a time division duplex band; and step B of performing an operation in the subband of the set uplink signal when a synchronization signal from an additional cell is set in the subband of the uplink signal.

[0012] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. FIG. 3 is a diagram showing an example configuration of a radio frame, a subframe, and a slot used in the wireless communication system 10. FIG. 4 is a functional block configuration diagram of a UE 200. FIG. 5 is a functional block configuration diagram of a gNB 100. FIG. 6 is a diagram for explaining the problem. FIG. 7 is a diagram for explaining operation example 2. FIG. 8 is a diagram for explaining operation example 3. FIG. 9 is a diagram for explaining operation example 3. FIG. 10 is a diagram for explaining operation example 3. FIG. 11 is a diagram for explaining operation example 3. FIG. 12 is a diagram showing an example of the hardware configuration of a gNB 100 and a UE 200. FIG. 13 is a diagram showing an example configuration of a vehicle 2001.

[0013] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0014] (1) Overall Schematic Configuration of Wireless Communication System Fig. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE (User Equipment) 200).

[0015] The wireless communication system 10 may be a wireless communication system conforming to a system called Beyond 5G, 5G Evolution, or 6G.

[0016] The NG-RAN 20 includes a base station 100 (hereinafter, gNB 100). Note that the specific configuration of the wireless communication system 10, including the number of gNBs 100 and UEs 200, is not limited to the example shown in FIG.

[0017] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). The NG-RAN 20 and the 5GC may be simply referred to as a "network."

[0018] The gNB100 is a radio base station conforming to 5G, and performs 5G radio communication with the UE 200. The gNB100 and UE 200 are capable of supporting Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional beam (BM) by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates on two or more transport blocks between the UE and each of two NG-RAN nodes.

[0019] The wireless communication system 10 also supports a plurality of frequency ranges (FR).

[0020] First, the wireless communication system 10 may support multiple frequency ranges (FR) as shown in Fig. 2. For example, the wireless communication system 10 supports FR1, FR2-1, and FR2-2. The frequency bands of each FR are as follows:

[0021] ・FR1: 410 MHz to 7.125 GHz ・FR2-1: 24.25 GHz to 52.6 GHz ・FR2-2: Over 52.6 GHz to 71 GHz FR1 may use a sub-carrier spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1 and may use an SCS of 60 kHz or 120 kHz (including 240 kHz) and a bandwidth (BW) of 50 to 400 MHz.

[0022] Note that SCS may be interpreted as numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

[0023] Furthermore, the wireless communication system 10 may also be compatible with frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 may be compatible with frequency bands exceeding 52.6 GHz up to 71 GHz or 114.25 GHz.

[0024] Second, the wireless communication system 10 may support the radio frames, subframes, and slots shown in FIG.

[0025] As shown in Figure 3, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). In addition to 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz, the SCS may also use 480 kHz, 960 kHz, etc.

[0026] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 symbols or 56 symbols). Furthermore, the number of slots per subframe may differ depending on the SCS.

[0027] The time direction (t) shown in Fig. 3 may be called a time domain, a symbol period, a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0028] (2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described.

[0029] First, the functional block configuration of the UE 200 will be described.

[0030] Fig. 4 is a functional block diagram of UE 200. As shown in Fig. 4, UE 200 includes radio signal transmitting / receiving unit 210, amplifier unit 220, modem unit 230, control signal / reference signal processing unit 240, encoding / decoding unit 250, data transmitting / receiving unit 260, and control unit 270.

[0031] The radio signal transmitting / receiving unit 210 transmits and receives radio signals conforming to NR. The radio signal transmitting / receiving unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and two NG-RAN nodes.

[0032] In the embodiment, the radio signal transceiver 210 constitutes a communication unit that communicates with a duplex cell capable of simultaneous communication of an uplink signal (hereinafter, referred to as a UL signal) and a downlink signal (hereinafter, referred to as a DL signal) within a time division duplex band. Note that a new duplex cell capable of simultaneous communication of a UL signal and a DL signal may be referred to as SBFD (Sub-Band non-overlapping Full Duplex). SBFD may also be read as XDD (Cross Division Duplex).

[0033] Simultaneous communication of UL signals and DL signals may be performed using specific time resources. The specific time resources are time resources to which SBFD can be applied. The specific time resources may also be interpreted as SBFD resources (SBFD symbols / slots) that are quasi-statically or dynamically configured in the time direction (or the time domain). The specific time resources may also be interpreted as resources in which UL sub-band(s) and DL sub-band(s) are simultaneously configured quasi-statically or dynamically in the time direction (or the time domain).

[0034] The duplex mode cell may be referred to as an SBFD operation cell. The additional cell may be referred to as an Additional PCI (Physical Cell Identifier) ​​Cell. The Additional PCI Cell may include a cell that operates in SBFD (SBFD operation cell) or a cell that does not operate in SBFD (Non-SBFD operation cell).

[0035] The amplifier unit 220 is configured by a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the radio signal transmission / reception unit 210.

[0036] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB 100 or another gNB). The modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0037] The control signal and reference signal processor 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0038] Specifically, the control signal / reference signal processing unit 240 receives various control signals, for example, control signals of a radio resource control layer (RRC), transmitted via a predetermined control channel from the gNB 100. In addition, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

[0039] The control signal / reference signal processor 240 performs processing using reference signals (RS) such as a Demodulation Reference Signal (DMRS) and a Phase Tracking Reference Signal (PTRS).

[0040] DMRS is a reference signal (pilot signal) known between the base station and the terminal for estimating the fading channel used for data demodulation, while PTRS is a terminal-specific reference signal for estimating phase noise, which is an issue in high frequency bands.

[0041] In addition to the DMRS and PTRS, the reference signals may also include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0042] The channels include control channels and data channels, such as a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a RACH (Random Access Channel), a Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), and a Physical Broadcast Channel (PBCH).

[0043] Furthermore, the data channel includes a PDSCH (Physical Downlink Shared Channel) and a PUSCH (Physical Uplink Shared Channel). Data refers to data transmitted via the data channel. The data channel may be interpreted as a shared channel.

[0044] Here, the control signal and reference signal processor 240 may receive downlink control information (DCI). The DCI includes existing fields for storing DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Assignment), TDRA (Time Domain Resource Assignment), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number), NDI (New Data Indicator), RV (Redundancy Version), and the like.

[0045] The value stored in the DCI Format field is an information element that specifies the format of the DCI. The value stored in the CI field is an information element that specifies the CC to which the DCI applies. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI applies. The BWP that can be specified by the BWP indicator is set by an information element (BandwidthPart-Config) included in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resource to which the DCI applies. The frequency domain resource is identified by the value stored in the FDRA field and an information element (RA Type) included in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resource to which the DCI applies. The time domain resource is identified by the value stored in the TDRA field and information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) included in the RRC message. The time domain resource may be identified by the value stored in the TDRA field and a default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI applies. The MCS is identified by the value stored in the MCS and an MCS table. The MCS table may be specified by an RRC message or may be determined by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ process to which the DCI is applied. The value stored in the NDI field is an information element for specifying whether the data to which the DCI is applied is initial transmission data. The value stored in the RV field is an information element that specifies the redundancy of the data to which the DCI is applied.

[0046] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or another gNB).

[0047] Specifically, the encoding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into pieces of a predetermined size, performs channel coding on the divided data, decodes the data output from the modem unit 230, and concatenates the decoded data.

[0048] The data transmitter / receiver 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmitter / receiver 260 assembles and disassembles PDUs / SDUs in multiple layers (such as a Medium Access Control layer (MAC), a Radio Link Control layer (RLC), and a Packet Data Convergence Protocol layer (PDCP)). The data transmitter / receiver 260 also performs data error correction and retransmission control based on Hybrid Automatic Repeat Request (HARQ).

[0049] The control unit 270 controls each functional block constituting the UE 200. In the embodiment, the control unit 270 configures a control unit that performs operations in a sub-band of an UL signal (hereinafter, referred to as an UL sub-band) when a synchronization signal from an additional cell is set in the UL sub-band. The synchronization signal is an example of a DL signal, and may be read as an SSB (Synchronization Signal Block).

[0050] Secondly, we will explain the functional block configuration of gNB100.

[0051] Fig. 5 is a functional block diagram of the gNB 100. As shown in Fig. 5, the gNB 100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0052] The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive an UL signal via a PUCCH or a PUSCH.

[0053] The transmitter 120 transmits various signals to the UE 200. The transmitter 120 may transmit the DL signal via the PDCCH or the PDSCH.

[0054] In the embodiment, the receiving unit 110 and the transmitting unit 120 constitute a communication unit that communicates with the UE 200 via a SBFD operation cell that can perform simultaneous communication of UL signals and DL signals within the TDD band.

[0055] The control unit 130 controls the gNB 100. In an embodiment, the control unit 130 is configured to assume that the UE 200 performs operation in a UL signal sub-band (UL sub-band) when a synchronization signal from an additional cell is configured in the UL sub-band.

[0056] (3) Issues First, we will explain resource allocation for gNB100.

[0057] In Releases 15, 16, and 17, the gNB 100 sets or designates "DL," "F (Flexible)," or "UL" for each symbol, as shown in the upper part of Figure 6. Simultaneous transmission of DL and UL signals is not permitted in a given time resource.

[0058] On the other hand, in Release 18, as shown in the lower part of Figure 6, the gNB 100 sets or designates "DL" for symbols of certain frequency resources (e.g., sub-band(s)) and sets or designates "UL" for symbols of other frequency resources (e.g., sub-band(s)). Simultaneous communication of DL signals and UL signals is permitted in certain time resources. This method may be referred to as SBFD (Sub-Band non-overlapping Full Duplex).

[0059] Secondly, a case will be described in which the SBFD operation cell and the Additional PCI cell communicate with the UE 200. Such a case may include Carrier Aggregation (CA) or Dual Connectivity (DC).

[0060] In cases such as CA or DC, a synchronization signal (hereinafter, SSB) from an additional PCI cell may be configured in the UL sub-band for SBFD. In other words, a UL sub-band for SBFD may be configured in an SSB symbol from the additional PCI cell.

[0061] Under such circumstances, the inventors have found, as a result of intensive study, the need to clarify whether or not a terminal that recognizes SBFD (hereinafter, SBFD-aware UE) performs UL transmission in an SSB symbol when considering a case where an SSB from an Additional PCI Cell may be set in an UL sub-band related to SBFD. Whether or not to perform UL transmission in an SSB symbol may be interpreted as the operation in the UL sub-band described above.

[0062] (4) Definition of Terms The following explains the definitions of terms related to SBFD.

[0063] The SBFD operation cell is a cell in which the position of the SBFD sub-band in the time or frequency direction is configured in the serving cell.

[0064] A non-SBFD operation cell is a cell in which no SBFD sub-bands are configured in the serving cell.

[0065] A semi-static DL slot / symbol is a slot / symbol configured as DL by higher layer parameters (tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated).

[0066] A semi-static UL slot / symbol is a slot / symbol configured as a UL by higher layer parameters (tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated).

[0067] A semi-static flexible slot / symbol is a slot / symbol that is set as Flexible by a higher layer parameter (tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated).

[0068] A Dynamic DL slot / symbol is a slot / symbol that is set as Flexible by higher layer parameters (tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated) and is specified as DL by DCI Format 2_0.

[0069] A Dynamic UL slot / symbol is a slot / symbol that is set as Flexible by the upper layer parameters (tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated) and is specified as UL by DCI Format 2_0.

[0070] A dynamic flexible slot / symbol is a slot / symbol that is set as Flexible by higher layer parameters (tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated) and is specified as Flexible by DCI Format 2_0.

[0071] (5) Operational Example In order to solve the above-mentioned problem, the following operational example may be defined. Specifically, the following mainly describes the operation in the UL sub-band when an SSB from an additional PCI cell is set in the UL sub-band.

[0072] (5.1) Operation Example 1 In Operation Example 1, it will be described whether or not the configuration of an SSB from an Additional PCI Cell is permitted in the UL sub-band of SBFD. The SSB from the Additional PCI Cell may be provided by an information element (e.g., ssb-PositionsInBurst) included in an upper layer parameter (e.g., SSB-MTCAdditionalPCI). The upper layer parameter may be associated with a physical cell ID having active TCI states of PDCCH or PDSCH. Operation Example 1 may be based on the premise that dl-OrJointTCI-StateList is not provided to UE 200. The following options are possible for Operation Example 1.

[0073] In option 1-1, the setting of SSB from an additional PCI cell is not permitted in the UL sub-band of SBFD. That is, the setting of UL sub-band of SBFD may not be permitted in the SSB from an additional PCI cell.

[0074] For example, UE200 does not need to assume the setting of an SBFD UL sub-band in a set of symbols configured for receiving SS / PBCH blocks using ssb-PositionsInBurst included in SSB-MTCAdditionalPCI associated with a physical cell ID having active TCI states of DCCH or PDSCH.

[0075] In option 1-2, the setting of an SSB from an additional PCI cell in the UL sub-band is permitted. That is, the setting of an UL sub-band for SBFD may be permitted in the SSB from an additional PCI cell.

[0076] For example, UE200 may assume the setting of an SBFD UL sub-band in a set of symbols configured for receiving SS / PBCH blocks using ssb-PositionsInBurst included in SSB-MTCAdditionalPCI associated with a physical cell ID having active TCI states of DCCH or PDSCH.

[0077] Here, for the serving cell, the UL sub-band configuration of SBFD is allowed in the SSB due to the difference between the SSB period and the SBFD configuration period. According to Option 1-2, the Additional PCI Cell can also be operated in the same way as the serving cell.

[0078] In the operation example 2 and operation example 3 described below, option 1-2 may be assumed.

[0079] (5.2) Operation Example 2 In Operation Example 2, a case is described in which the UL sub-band for SBFD is assumed to be configured in a symbol set configured for receiving SS / PBCH blocks. The following options are possible for Operation Example 2.

[0080] In option 2-1, UE 200 may ignore the UL sub-band configured in the SSB symbol regardless of whether the configured UL sub-band overlaps with any of the RBs in the SSB symbol, i.e., UE 200 may not transmit a UL signal in the UL sub-band.

[0081] According to Option 2-1, the relationship between the RBs of the SSB symbol and the UL sub-band is not important. That is, any of Cases 1 to 4 shown in Fig. 7 may be permitted. Note that Case 1 is a case where RBs of the SSB symbol are configured in the DL sub-band, Case 2 is a case where RBs of the SSB symbol are configured across the DL sub-band and the UL sub-band, Case 3 is a case where RBs of the SSB symbol are configured in the UL sub-band and across the DL sub-band, UL sub-band, and DL sub-band. Case 4 is a case where RBs of the SSB symbol are configured across the entire UL sub-band.

[0082] In option 2-2, UE 200 may not assume that the configured UL sub-band overlaps with any of the RBs in the SSB symbol, and UE 200 may transmit a UL signal in the UL sub-band configured in the SSB symbol.

[0083] According to Option 2-2, Cases 2 to 4 shown in FIG. 7 are not allowed, but Case 1 shown in FIG. 7 is allowed.

[0084] In Option 2-3, UE 200 may allow the configured UL sub-band to overlap with any of the RBs of the SSB symbol. The UL sub-band may or may not be applied to UE 200. Here, Option 2-3 may further include the following options.

[0085] In Option 2-3-1, UE 200 may ignore the UL sub-band configured for an SSB symbol when an SBFD UL sub-band is configured in any of the RBs of the SSB symbol. That is, UE 200 may not transmit a UL signal in the UL sub-band (e.g., Cases 2 to 4 shown in FIG. 7 ). On the other hand, UE 200 may transmit a UL signal in the UL sub-band when an SBFD UL sub-band is not configured in any of the RBs of the SSB symbol (e.g., Case 1 shown in FIG. 7 ).

[0086] In Option 2-3-2, when an SBFD UL sub-band is configured in an SSB symbol, UE 200 may ignore the UL sub-band that overlaps with each RB of the SSB symbol. That is, UE 200 may not transmit the UL signal in the UL sub-band (e.g., Case 4 shown in FIG. 7 ). On the other hand, when an SBFD UL sub-band is configured in an SSB symbol, UE 200 may transmit the UL signal in the UL sub-band that does not overlap with each RB of the SSB symbol (e.g., Cases 1 to 3 shown in FIG. 7 ).

[0087] In option 2-3-3, when an SBFD UL sub-band is configured in an SSB symbol and there are X or more RBs (X is an integer greater than or equal to 1) in the UL sub-band that do not overlap with the RBs of the SSB symbol in the UL sub-band, UE 200 may transmit a UL signal in the UL sub-band in X RBs. X RBs may also be interpreted as X consecutive RBs. When an SBFD UL sub-band is configured in an SSB symbol and there are X or more RBs in the UL sub-band that do not overlap with the RBs of the SSB symbol in the UL sub-band, UE 200 may ignore the UL sub-band.

[0088] Note that option 2-3-3 may be interpreted as follows. Specifically, when an SBFD UL sub-band is configured in an SSB symbol and there are Y or more RBs (Y is an integer greater than or equal to 1) in the UL sub-band that overlap with the RBs of the SSB symbol, UE 200 may ignore the UL sub-band. Y RBs may also be interpreted as Y consecutive RBs. On the other hand, when an SBFD UL sub-band is configured in an SSB symbol and there are Y or more RBs in the UL sub-band that overlap with the RBs of the SSB symbol, UE 200 may transmit a UL signal in a UL sub-band that does not overlap with the RBs of the SSB symbol.

[0089] (5.3) Operation Example 3 In Operation Example 3, the operation of UE 200 regarding SSB will be described in a case where transmission of a UL signal is permitted in the UL sub-band of SBFD set in the SSB symbol. In Operation Example 3, a case may be assumed in Option 2-2 or Option 2-3 of Operation Example 2 where transmission of a UL signal is permitted in the UL sub-band of SBFD set in the SSB symbol. The following options are possible for Operation Example 3.

[0090] In option 3-1, the UE 200 may be configured or instructed by the gNB 100 to skip SSB reception or measurement. The skipping of SSB may be configured or instructed by at least one of RRC / MAC CE / DCI. The following options may be considered for configuring or instructing the skipping of SSB.

[0091] In option 3-1-1, as shown in Fig. 8, an SSB skipping pattern may be set or indicated to instruct UE 200 to skip SSB reception or measurement. The SSB skipping pattern may be set or indicated by at least one of RRC / MAC CE / DCI. The SSB skipping pattern may be represented by a bitmap.

[0092] The bits representing the SSB skipping pattern may specify skipping or not skipping for each SSB reception (or SSB index). The bits representing the SSB skipping pattern may specify skipping or not skipping for a set of SSB receptions (or SSB indexes) included in a time window. The time window may be determined per X symbols / slots / TDD config periods / SBFD configuration periods, etc. One bit may be set or indicated per time window, and one bit may apply to all SSB receptions included in the time window.

[0093] In option 3-1-1, the skipping pattern may be applied periodically. The skipping pattern may be applied until a new skipping pattern is set or indicated. The skipping pattern may be applied until a deactivation command is received. The skipping pattern may be applied until a timer expires. The timer may be started in response to the application of the skipping pattern. The skipping pattern may be applied until X period has elapsed. The X period may be set or indicated by the gNB 100 or may be predefined in the wireless communication system 10. The period of the skipping pattern may be the same as the period of the SSB, half a frame, TDD config pattern periods, or SBFD time location configuration period.

[0094] In option 3-1-1, the skipping pattern may be applied only once.

[0095] In option 3-1-2, as shown in Fig. 9 or 10, the UE 200 may be instructed or configured by the gNB 100 to skip reception or measurement of SSB within the Skipping window. The following options are possible for setting or instructing the Skipping window.

[0096] In Option 3-1-2-1, the skipping window may be periodically set by the RRC as shown in Fig. 9. The period (Periodicity shown in Fig. 9), offset (Offset shown in Fig. 9), or window length of the skipping window may be set by the RRC or may be predefined in the wireless communication system 10.

[0097] In option 3-1-2-1, the skipping window period may be K symbols / slots / TDD config periods / SBFD configuration periods / Half frames / RRB repetitions, etc. The offset may be X symbols / slots / TDD config periods / SBFD configuration periods / Half frames / RRB repetitions, etc. The window length may be Y symbols / slots / TDD config periods / SBFD configuration periods / Half frames / RRB repetitions, etc.

[0098] In option 3-1-2-2, the skipping window may be based on a dynamic indication such as MAC CE / DCI, as shown in FIG.

[0099] In option 3-1-2-2, the start of the skipping window may be X symbols / slots / SSB receptions after the DCI instruction. The start of the skipping window may be X symbols / slots / SSB receptions after the HARQ-ACK for the PDSCH corresponding to the MAC CE instruction. X may be predefined in the wireless communication system 10, may be set by the RRC, or may be indicated by the DCI / MAC CE. The window length of the skipping window may be Y symbols / slots / SSB receptions. Y may be predefined in the wireless communication system 10, may be set by the RRC, or may be indicated by the DCI / MAC CE.

[0100] In option 3-1-2, the UE 200 receives or measures SSBs that are not included in the Skipping window in the same way as it receives or measures existing SSBs.

[0101] In option 3-1, UE 200 receives or measures SSBs for which Not Skipping is instructed, and does not expect to transmit an UL signal in any SSB symbol.

[0102] In option 3-1, UE 200 may assume transmission of an UL signal for an SSB for which skipping is instructed. The following Alt.s are possible for assuming transmission of an UL signal.

[0103] In Alt. 3-1-1, UE 200 may assume transmission of a UL signal in an SSB symbol if there is an SSB symbol in an SBFD symbol within the SBFD UL sub-band, without performing SSB reception or measurement.

[0104] In Alt. 3-1-2, when at least one SSB symbol is configured in the SBFD UL sub-band, UE200 may assume transmission of a UL signal in the SSB symbol of the SBFD symbol within the SBFD UL sub-band without performing SSB reception or measurement.

[0105] Note that UE 200 may receive or measure an SSB for which skipping is instructed if each (all) of the SSB symbols is a non-SBFD symbol. UE 200 does not need to assume that skipping is instructed for an SSB that does not include any SBFD symbols.

[0106] In Alt. 3-1-3, when each (all) of the SSB symbols are configured in the SBFD UL sub-band, UE 200 may assume transmission of an UL signal in the SSB symbol of the SBFD symbol in the SBFD UL sub-band without receiving or measuring the SSB corresponding to the SBFD symbol in the SBFD UL sub-band.

[0107] Note that UE 200 may receive or measure an SSB for which skipping is instructed when each (all) of the SSB symbols is a non-SBFD symbol. UE 200 does not need to assume that skipping is instructed for an SSB symbol set in a non-SBFD symbol.

[0108] For example, consider Case 1 to Case 3 as shown in Fig. 11. Case 1 is a case where each SSB symbol (all symbols) is a Non-SBFD symbol. Case 2 is a case where some SSB symbols are SBFD symbols. Case 3 is a case where each SSB symbol (all symbols) is an SBFD symbol.

[0109] As shown in Figure 11, in Case 1, when Alt.3-1-1 is applied, reception or measurement of SSBs for which skipping is specified is not performed. When Alt.3-1-2 is applied, reception or measurement of SSBs for which skipping is specified is performed. When Alt.3-1-3 is applied, reception or measurement of SSBs for which skipping is specified is performed.

[0110] As shown in Figure 11, in Case 2, if Alt.3-1-1 is applied, reception or measurement of SSBs for which skipping is specified is not performed. If Alt.3-1-2 is applied, reception or measurement of SSBs for which skipping is specified is not performed. If Alt.3-1-3 is applied, reception or measurement of SSBs for which skipping is specified is performed.

[0111] As shown in Figure 11, in Case 3, if Alt.3-1-1 is applied, reception or measurement of SSBs for which skipping is specified is not performed. If Alt.3-1-2 is applied, reception or measurement of SSBs for which skipping is specified is not performed. If Alt.3-1-3 is applied, reception or measurement of SSBs for which skipping is specified is not performed.

[0112] In option 3-1, UE 200 may not assume that skipping is instructed for an SSB for L1 beam measurement / reporting. UE 200 may not assume that skipping is instructed for an SSB corresponding to the Source RS index of the TCI state activated by the MAC CE.

[0113] In option 3-1, UE 200 may receive or measure an SSB for L1 beam measurement / reporting even if skipping is instructed for the SSB. UE 200 may receive or measure an SSB corresponding to the Source RS index of the TCI state activated by the MAC CE even if skipping is instructed for the SSB.

[0114] In option 3-2, UE 200 may always prioritize transmission of UL signals over reception or measurement of SSB.

[0115] Specifically, when there is an UL signal to be transmitted in the SSB symbol of the SBFD symbol in the SBFD UL sub-band, UE 200 may transmit the UL signal in the SSB symbol of the SBFD symbol in the SBFD UL sub-band without receiving or measuring the SSB.When there is no UL signal to be transmitted in the SSB symbol of the SBFD symbol in the SBFD UL sub-band, UE 200 receives or measures the SSB in the same way as with existing SSB.

[0116] In Option 3-2, the operation of prioritizing UL signal transmission over SSB reception or measurement (hereinafter referred to as UL prioritization) may be applied when at least one symbol included in the SSB reception or measurement symbol set is configured in the SBFD UL sub-band and there is an opportunity to transmit a UL channel or UL signal for that symbol. UL prioritization may be applied when each (all) of the symbols included in the SSB reception or measurement symbol set is configured in the SBFD UL sub-band.

[0117] In option 3-2, UL prioritization may be allowed or performed for SSB symbols of certain SSB index(es). The certain SSB index(es) may be predefined in the wireless communication system 10, or may be set or indicated by the gNB 100. For SSB index(es) other than the certain SSB index(es), UL prioritization may not be applied.

[0118] In Option 3-2, UL prioritization may be applied to SSBs other than the SSB for L1 beam measurement / reporting. UL prioritization may be applied to SSBs other than the SSB corresponding to the Source RS index of the TCI state activated by the MAC CE. UL prioritization may not be applied to SSBs other than the SSB for L1 beam measurement / reporting. UL prioritization may not be applied to SSBs corresponding to the Source RS index of the TCI state activated by the MAC CE. Option 3-3 may combine Option 3-1 and Option 3-2.

[0119] In option 3-3, UE 200 may receive or measure SSBs for which non-skipping is instructed, and may not assume transmission of UL signals.

[0120] In option 3-3, for an SSB for which skipping is instructed, UE 200 may transmit a UL signal without receiving or measuring the SSB if at least one symbol included in the set of symbols for SSB reception or measurement is set in the SBFD UL sub-band and there is an opportunity to transmit a UL channel or UL signal for that symbol. UE 200 performs SSB reception or measurement in the same way as for existing SSBs if there is no UL signal to transmit in the SSB symbol of the SBFD symbol in the SBFD UL sub-band.

[0121] In Option 3-3, the options or alternatives described in Option 3-1 or Option 3-2 may also be applied.

[0122] In option 3-4, UE 200 may determine whether to prioritize receiving or measuring SSB and transmitting UL signals based on a priority rule, which may be predetermined in wireless communication system 10 depending on the characteristics of the SSB, UL channel, or UL signal.

[0123] In Option 3-4, if there is no UL signal to be transmitted in the SSB symbol of the SBFD symbol in the SBFD UL sub-band, UE 200 may receive or measure the SSB in the same way as for the existing SSB. The following options are possible as priority rules.

[0124] In option 3-4-1, the priority rule may be that a certain type of SSB has a higher priority for transmitting an UL signal. A certain type of SSB may be selected from among multiple types of SSB.

[0125] Here, the multiple types may be the following types. Type 1 may be SS / PBCH blocks according to ssb-PositionsInBurst included in SIB1 or SS / PBCH blocks according to ssb-PositionsInBurst included in ServingCellConfigCommon. Type 2 may be SS / PBCH blocks according to ssb-PositionsInBurst included in SSB-MTCAdditionalPCI associated with a physical cell ID having active TCI states of PDCCH or PDSCH when dl-OrJointTCI-StateList is not provided to UE 200. Type 3 may be an SSB for L1 beam measurement / reporting. Type 4 may be an SSB corresponding to the Source RS index of the TCI state activated by the MAC CE.

[0126] A certain type of SSB may be predefined in the wireless communication system 10 or configured by the RRC. For a certain type of SSB, the UE 200 may receive or measure the SSB without applying UL prioritization.

[0127] For example, one type of SSB may be an SSB for L1 beam measurement / reporting, or an SSB corresponding to a Source RS index of a TCI state activated by a MAC CE.

[0128] Note that Option 3-4-2, described later, may be applied to SSBs other than certain types of SSBs. SSBs other than certain types of SSBs may be SS / PBCH blocks defined by ssb-PositionsInBurst included in SIB1 or SS / PBCH blocks defined by ssb-PositionsInBurst included in ServingCellConfigCommon. SSBs other than certain types of SSBs may be SS / PBCH blocks defined by ssb-PositionsInBurst included in SSB-MTCAdditionalPCI associated with a physical cell ID having active TCI states for PDCCH or PDSCH when dl-OrJointTCI-StateList is not provided to UE 200.

[0129] In option 3-4-2, the priority rule may be a rule that the UL channel or UL signal has a higher priority than the SSB if certain conditions are met. Such conditions may include the following:

[0130] Condition 1 may be for a channel type that has an opportunity for an UL channel or UL signal. The channel type may be a PUCCH, a PUSCH, or an SRS.

[0131] Condition 2 may be that the PHY priority has a chance of an UL channel or UL signal. The value of PHY priority may be expressed as 0 or 1.

[0132] Condition 3A may be that the UL channel or UL signal opportunity is a dynamic / aperiodic channel or signal. A dynamic / aperiodic channel or signal is a channel or signal that is scheduled or triggered by a certain DCI format. A dynamic / aperiodic channel or signal may be a dynamic PUSCH (scheduled by a certain DCI format), an aperiodic SRS (triggered by a certain DCI format), or an aperiodic CSI report (triggered by a certain DCI format).

[0133] Condition 3B may be that the UL channel or UL signal opportunity is a semi-persistent channel or signal. A semi-persistent channel or signal is a channel or signal that is activated or triggered by a certain DCI format. A semi-persistent channel or signal may be a type 2 CG PUSCH (activated by a certain DCI format), a semi-persistent SRS (triggered by a certain DCI format), or a semi-persistent CSI report (triggered by a certain DCI format).

[0134] Condition 3C may be that the UL channel or UL signal opportunity is a periodic channel or signal. For example, the periodic channel or signal may be a type 1 CG PUSCH, a periodicity SRS, or a periodic CSI report.

[0135] Condition 4A may be that the UL channel or UL signal opportunity is one that does not involve repeated transmission, or that the UL channel or UL signal opportunity is one that involves repeated transmission and is for the first transmission.

[0136] Condition 4B may be that the UL channel or UL signal opportunity is one involving repeated transmission.Condition 4B may be that the UL channel or UL signal opportunity is for a transmission other than the first transmission involving repeated transmission.

[0137] Condition 5 may be that the UL channel or UL signal does not overlap with the DL sub-band. The UL channel or UL signal may or may not overlap with the guard band.

[0138] Condition 6 may be that the UL channel or UL signal does not overlap with any semi-static DL Non-SBFD symbol.Condition 6 may be that the SSB symbol is not set in the UL sub-band of SBFD.

[0139] In option 3-4, UE 200 transmits a UL signal in a UL channel or UL signal opportunity in the UL sub-band if the UL signal transmission has a higher priority than the SSB. If the UL signal transmission does not have a higher priority than the SSB, UE 200 receives or measures the SSB without transmitting the UL signal.

[0140] In Option 3-4, if the priority rule described in Option 3-4-2 applies to multiple types of SSBs, the conditions required for UL prioritization may differ for each type of SSB. For example, Condition 3A may be required for type 1 SSB, and Conditions 1 and 3A may be required for type 2 SSB. However, the conditions required for each SSB type are not limited to this.

[0141] In option 3-4, if UE200 determines that transmission of the UL signal in the SSB symbol is prioritized and the UL channel or UL signal overlaps with the DL sub-band (or guard band), UE200 performs rate matching of the UL channel or UL signal excluding the DL sub-band (or guard band), or drops / cancels transmission of the UL channel or UL signal.

[0142] Option 3-4 may be applied when at least one symbol of the set of symbols for SSB reception or measurement is configured within the UL sub-band of SBFD and there is an opportunity to transmit a UL channel or UL signal in that symbol. Otherwise, UE 200 may perform SSB reception or measurement in the same way as for existing SSB.

[0143] Option 3-4 may be applied when each (all) of the symbols in the set of symbols for SSB reception or measurement is set within the UL sub-band of SBFD and there is an opportunity to transmit a UL channel or UL signal in that symbol (at least one or all). Otherwise, UE 200 may perform SSB reception or measurement in the same way as for existing SSB.

[0144] In option 3-4, UL prioritization may be allowed or performed for SSB symbols of certain SSB index(es). The certain SSB index(es) may be predefined in the wireless communication system 10, or may be set or indicated by the gNB 100. For SSB index(es) other than the certain SSB index(es), UL prioritization may not be applied.

[0145] Option 3-5 may combine options 3-1 and 3-4.

[0146] In options 3-5, the UE 200 may receive or measure the SSB for which non-skipping is instructed, and may not assume transmission of an UL signal.

[0147] In option 3-5, UE 200 determines whether to transmit an UL signal for an SSB for which skipping is instructed based on the priority rule described in option 3-4. In other words, UE 200 determines whether to receive or measure an SSB for which skipping is instructed based on the priority rule described in option 3-4.

[0148] In options 3-5, when UE 200 prioritizes UL signal transmission, it transmits the UL signal on a UL channel in the UL sub-band or in an UL signal opportunity.When UE 200 does not prioritize UL signal transmission, it receives or measures SSB without transmitting the UL signal.

[0149] As described above, in Operation Example 3, when the UL sub-band of the configured SBFD overlaps with the SSB symbol, UE 200 performs one of the SSB-related operation (reception or measurement) and UL signal transmission based on a condition. The condition may be any of the various conditions described in Option 3-1 to Option 3-5.

[0150] (6) Actions and Effects In the embodiment, when an SSB from an Additional PCI Cell is set in a sub-band (UL sub-band) of a UL signal, the UE 200 performs an operation in the set UL sub-band. With this configuration, in consideration of a case where an SSB from an Additional PCI Cell may be set in the UL sub-band related to SBFD, it is clarified whether or not the UE 200 that recognizes SBFD (SBFD-aware UE) performs UL transmission in an SSB symbol, and appropriate communication can be performed in SBFD.

[0151] (7) Other Embodiments The contents of the present invention have been described above in accordance with the embodiments, but it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0152] Although not particularly mentioned in the above disclosure, which of Operational Examples 1 to 3 to use (hereinafter, referred to as which aspect to use) may be set by a higher layer parameter. Which of each option or Alt. of Operational Examples 1 to 3 to use (hereinafter, referred to as which aspect to use) may be set by a higher layer parameter. Which aspect to support may be reported from UE 200 as UE capability(ies). Which aspect to use may be defined in advance in wireless communication system 20. Which aspect to use may be set by a higher layer parameter and reported from UE 200 as UE capability(ies).

[0153] Although not specifically mentioned in the above disclosure, the UE capability(ies) may include an information element indicating whether or not the UL sub-band configuration for SBFD is supported in the SSB symbol of the serving cell.

[0154] Although not specifically mentioned in the above disclosure, the UE capability(ies) may include an information element indicating whether or not the UE supports the configuration of UL sub-bands for SBFD in the SSB symbols of the additional cell.

[0155] Although not specifically mentioned in the above disclosure, the UE capability(ies) may include an information element indicating whether or not the UE supports UL sub-bands of SBFD that overlap with RBs of SSB.

[0156] Although not specifically mentioned in the above disclosure, the UE capability(ies) may include an information element indicating whether or not the UE supports transmission of a UL signal in the SSB symbol of the UL sub-band of SBFD.

[0157] Although not specifically mentioned in the above disclosure, the UE capability(ies) may include an information element indicating whether or not to support SSB reception or measurement skipping configured or instructed by the gNB100.

[0158] Although not specifically mentioned in the above disclosure, the UE capability(ies) may include an information element indicating whether or not to prioritize transmission of a UL signal in an SSB symbol of the UL sub-band of SBFD.

[0159] In the above disclosure, configure, activate, update, indicate, enable, specify, and select may be interchangeable. Similarly, link, associate, correspond, and map may be interchangeable, and allocate, assign, monitor, and map may be interchangeable.

[0160] Furthermore, specific, dedicated, UE-specific, and UE-dedicated may be interchangeable. Similarly, common, shared, group-common, UE-common, and UE-shared may be interchangeable.

[0161] The block diagrams (FIGS. 4 and 5) used to explain the above-described embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and / or 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 (e.g., wired, wireless, etc.) and these multiple devices. The functional block may also be realized by combining software with the single device or multiple devices.

[0162] 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, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0163] Furthermore, the above-described gNB 100 and UE 200 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 12 is a diagram showing an example of the hardware configuration of the devices. As shown in Figure 12, the devices may be configured as a computer 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.

[0164] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0165] Each functional block of the device (see FIGS. 4 and 5) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0166] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0167] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, and registers.

[0168] 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. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0169] 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 ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 may store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0170] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0171] 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 called, for example, a network device, a network controller, a network card, or a communication module.

[0172] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0173] The input device 1005 is an input device (e.g., 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 (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0174] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to 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.

[0175] Furthermore, the device 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 by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0176] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0177] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), a 6th generation mobile communication system (6G), an xth generation mobile communication system (xG) (where x is, for example, an integer or a decimal), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0178] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0179] In the present disclosure, a specific operation described as being performed by a base station may, in some cases, be performed by its upper node. It is clear that in a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (such as, but not limited to, an MME or an S-GW). While the above example illustrates a case in which there is one other network node other than the base station, a combination of multiple other network nodes (such as an MME and an S-GW) may also be used.

[0180] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0181] The input and output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted to another device.

[0182] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0183] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0184] 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.

[0185] 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.

[0186] 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.

[0187] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0188] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0189] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0190] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., 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.

[0191] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0192] A base station can accommodate one or more (e.g., three) cells (also called sectors). 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 services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0193] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0194] In the present disclosure, the base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control or operate based on the information.

[0195] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0196] A mobile station may also be referred to by those skilled in the art 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.

[0197] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. 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.

[0198] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0199] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station.

[0200] A radio frame may be composed of one or more frames in the time domain, each of which may be called a subframe.

[0201] A subframe may further be composed of one or more slots in the time domain, and may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0202] Numerology may be a communication parameter applied to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation performed by a transceiver in the frequency domain, a particular windowing operation performed by a transceiver in the time domain, etc.

[0203] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) A slot may be a numerology-based time unit.

[0204] 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 (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0205] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0206] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be referred to as a slot, minislot, etc. instead of a subframe.

[0207] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that the definition of TTI is not limited to this.

[0208] 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.

[0209] In addition, 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. Furthermore, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0210] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE 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.

[0211] 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.

[0212] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0213] The time domain of an RB may include one or more symbols 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0218] 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."

[0219] 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 variously changed.

[0220] 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." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0221] The reference signal may also be abbreviated as Reference Signal (RS) and may be called a pilot depending on the applicable standard.

[0222] 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."

[0223] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0224] 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 therein or that the first element must precede the second element in some way.

[0225] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0226] 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.

[0227] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0228] 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."

[0229] 13 shows an example of the configuration of a vehicle 2001. As shown in Fig. 13, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0230] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0231] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0232] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2027 provided in the vehicle. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0233] The signals from the various sensors 2021 to 2028 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0234] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information obtained from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 1.

[0235] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize driving assistance functions or autonomous driving functions.

[0236] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from a driving unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, a microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2028, which are provided in the vehicle 2001.

[0237] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0238] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0239] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, sensors 2021 to 2028, and the like provided in the vehicle 2001.

[0240] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0241] (Additional Note) The above disclosure may be expressed as follows.

[0242] The first feature is a terminal including: a communication unit that communicates with a duplex cell that can perform simultaneous communication of an uplink signal and a downlink signal within a time division duplex band; and a control unit that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, performs operation in the set subband of the uplink signal.

[0243] A second feature is the terminal based on the first feature, wherein the control unit, as an operation in the subband of the set uplink signal, ignores the subband of the set uplink signal regardless of whether the subband of the set uplink signal overlaps with a symbol of the synchronization signal, and allows transmission of the uplink signal without assuming that the subband of the set uplink signal overlaps with a symbol of the synchronization signal, assumes that the subband of the set uplink signal overlaps with a symbol of the synchronization signal, and ignores the subband of the set uplink signal, or assumes that the subband of the set uplink signal overlaps with a symbol of the synchronization signal, and allows transmission of the uplink signal.

[0244] A third feature is a terminal according to the first or second feature, wherein, when a subband of the set uplink signal overlaps with a symbol of the synchronization signal, the control unit performs one of an operation related to the synchronization signal and transmission of the uplink signal based on a condition.

[0245] A fourth feature is a base station including: a communication unit that communicates with a terminal via a duplex cell that can perform simultaneous communication of an uplink signal and a downlink signal within a time division duplex band; and a control unit that assumes that, when a synchronization signal from an additional cell is set in a subband of the uplink signal, the terminal controls operation in the set subband of the uplink signal.

[0246] A fifth feature is a wireless communication system including a terminal and a base station, wherein the terminal includes a communication unit that communicates with a duplex cell that can perform simultaneous communication of an uplink signal and a downlink signal within a time division duplex band, and a control unit that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, performs an operation in the set subband of the uplink signal.

[0247] A sixth feature is a wireless communication method including: a step A of communicating with a duplex cell capable of performing simultaneous communication of an uplink signal and a downlink signal within a time division duplex band; and a step B of performing an operation in a subband of the uplink signal when a synchronization signal from an additional cell is set in the subband of the uplink signal.

[0248] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Receiving unit 120 Transmitting unit 130 Control unit 200 UE 210 Radio signal transmitting / receiving unit 220 Amplifying unit 230 Modulation / demodulation unit 240 Control signal / reference signal processing unit 250 Encoding / decoding unit 260 Data transmitting / receiving unit 270 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 RPM sensor 2023 Air pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving assistance system section 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port

Claims

1. A terminal comprising: a communication unit that communicates with a duplex cell capable of simultaneous communication of uplink and downlink signals within a time division duplex band; and a control unit that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, performs operation in the set subband of the uplink signal.

2. The terminal according to claim 1, wherein the control unit, as an operation in the subband of the set uplink signal, ignores the subband of the set uplink signal regardless of whether the subband of the set uplink signal overlaps with the symbols of the synchronization signal, allows transmission of the uplink signal without assuming that the subband of the set uplink signal overlaps with the symbols of the synchronization signal, ignores the subband of the set uplink signal while assuming that the subband of the set uplink signal overlaps with the symbols of the synchronization signal, or allows transmission of the uplink signal while assuming that the subband of the set uplink signal overlaps with the symbols of the synchronization signal.

3. The terminal according to claim 1, wherein the control unit performs one of an operation related to the synchronization signal and transmission of the uplink signal based on a condition when the subband of the set uplink signal overlaps with a symbol of the synchronization signal.

4. A base station comprising: a communication unit that communicates with a terminal via a duplex cell that can perform simultaneous communication of uplink signals and downlink signals within a time division duplex band; and a control unit that assumes that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, the terminal controls operation in the set subband of the uplink signal.

5. A wireless communication system comprising a terminal and a base station, wherein the terminal comprises: a communication unit that communicates with a duplex cell capable of simultaneous communication of uplink signals and downlink signals within a time division duplex band; and a control unit that, when a synchronization signal from an additional cell is set in the subband of the uplink signal, performs operation in the set subband of the uplink signal.

6. A wireless communication method comprising: step A of communicating with a duplex cell capable of simultaneous communication of uplink signals and downlink signals within a time division duplex band; and step B of performing operation in the set uplink signal subband when a synchronization signal from an additional cell is set in the uplink signal subband.

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